Why company should start saving on electricity

Why company should start saving on electricity Nowadays, electricity is a common utilities used everywhere especially on every company. There is numerous ways to save electricity especially on the company premise. Saving on electricity will give many good factors also beside that some negative factors. Paying bills will be more less compare to the previous as of result of the electricity saving. However, the electricity company will get impact for their annual profit because the revenue will be decreasing as a result of the less amount electricity bills by some company.

Every company also will be able to minimize the maintenance cost from the electricity saving. This shows by fewer Jobs done by electrical devices such as air conditioner, office lamp and others. As an example, the company will do servicing or replacing filters Inside air conditioner at the longer gap time compare to the previous. On the other hand, the maintenance servicing company will get less work also less revenue because of the action. The company also will be gain higher profit as a result of the electricity saving.

Generally, the electricity cost is among major cost of every company operations yearly. In addition, company will be able to pay more bonus and Increment to their respective staff. Unfortunately, the motivation for some staff will be decrease because of the easily company to pay high bonus and increment to their staff. Moreover, at the end of every year they Just wait for company to pay them bonus without them to produce higher productivity. Name: – Mood January Bin Bad Jaws sol 1630 Date: – 04/09/2014

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Rise of Industry in the Late 19th Century

During the 1860’s America was in a period of economic hardship due to the ongoing demand for materials and money to fund the war. In the South, sufficient money and materials were hard to acquire because the southern economy still depended on the labor of slaves to produce their goods and income rather than factories. The Northern economy used numerous factories to produce goods and make profit for the war, but they still did not have technology that was advanced enough to easily produce all the necessary materials and money.

After the civil war, America embarked on a journey of economic expansion and unification for the nation. In the late 19th century, government policies, technological advancements and population changes contributed to the rise of industry in America. Many government policies were created in the 19th century to encourage expansion and growth for America. Three very influential policies were the Homestead Act, the Pacific Railway Act and laissez-faire. The homestead act was passed by Congress in 1862 to encourage settlement of western land.

It promised any citizen of the United States that was at least 21 years old a homestead of 160 acres under the terms that they paid a 10 dollar registration fee, farmed on the land for 5 years and lived on the land for at least 6 months out of a year. When passed, the act proved a success at allowing huge masses of people to further enlarge and develop America because “settlers from all walks of life including newly arrived immigrants, farmers without land of their own from the East, single women and former slaves came to meet the requirements” (Weiser).

The pacific railway act of 1862 provided the Union Pacific and Central Pacific railroad companies with federal land grants and funds to construct a transcontinental railway that would unite the country as one. With the completion of the railroad, industry had the opportunity to rise across America because the transportation time of goods, capital, and people was significantly decreased and more efficient. Laissez-faire was a policy practiced by government that preached a free market economy.

Under laissez-faire, the business’s of America were able to grow and acquire larger sums of money because the government had little to no interference in the actions of companies. In the 19th century as settlement and companies expanded across America, technological discoveries were being made as part of an industrial revolution that would further the efficiency and growth of industry. With the transcontinental railroad, the steam engine could transport materials, machinery, goods and more to companies across America with much more ease than horses and wagons could in previous times.

The invention of the telephone by Alexander Graham Bell in 1876 increased communication between people to help the coordination and cohesiveness of companies. One brilliant inventor, Thomas Alva Edison, provided the nation with numerous inventions, two of which were the light bulb and the electric generator. As industrialization occurred, machinery was used to produce materials instead of human labor in order to increase production and profit. With the aid of Edison’s electrical generator, the machines of textiles could work faster and more efficient to maximize benefits.

Also, with the aid of the light bulb, textiles were able to have longer work hours and produce larger quantities because the restriction of daylight hours was no longer a problem. “By the end of the nineteenth century, the nation was about to become a mass-production economy” because “the utilization of steam and electricity, the introduction of improved processes and labor-saving machinery… multiplied enormously the effectiveness of labor” (Chandler 277; George 50).

As America was booming from government policies and new technology, population changes also took effect to contribute to the rise of industry. Population was steadily rising due to immigration, migration, and improved conditions of living. Millions of European and Asian immigrants came to America in search of a more promising and successful life. These immigrants created a growing work force that big industries took advantage of by using the minimally paid workers to help produce more for their companies.

Along with westward migration in America, “In the post-civil war period, cities swelled in population as a twin migration of immigrants and rural Americans flocked to the glittering urban environment” (Riis 320). This urbanization solidified the transition of the nation from an agricultural economy to an industrial one. Also in the 19th century, population was at a high compared the past because of improvements in health care, a higher reproduction rate and a better standard of living. These population changes provided America with a large, growing consumer economy that allowed industry and business to thrive.

Compared to previous times, America ended the 19th century at an all time high due to new government policies, technological advancements and population changes. With the help of federal encouragement to settle westward and unite the country, industry was able to expand to more places across the nation. In these numerous factories, textiles and other working places, new machinery and technology was used to produce greater quantities in a shorter amounts of time which allowed industry to gain more profit and grow.

These successful and innovative factories attracted immigrants and rural Americans, and pushed them to move to cities where industry and business could be a main focus. The growth of American industry in the 19th century took the nation to a whole new developmental level, and from there the nation continued to thrive and evolve. Citations Chandler, Alfred D. The Beginnings of “Big Business” in American Industry. 1959. American Issues. New York: Glencoe, 1994. 277-80. Print. Evans, Harold. “The Spark of Genius. ” 2004. American History. Vol. 2. Dubuque: McGraw Hill, 2007. 6-21. Print. George, Henry. “Progress and Poverty. ” 1879. America’s History. Fourth ed. Vol. 2. Boston: Bedford/St. Martin’s, 2001. 50-51. Print. Riis, Jacob. “Life in the Tenements of New York City. ” 1890. Voices of the American Past. Second ed. Vol. 2. Orlando: Harcourt College, 2001. 320-22. Print. Story, Jill. “Lecture. ” 27 Sept. 2010. Story, Jill. “Lecture. ” 5 Oct. 2010. Weiser, Kathy. “The Homestead Act – Creating Prosperity in America. “Legends of America – A Travel Site for the Nostalgic and Historic Minded. Apr. 2010. Web. 12 Oct. 2010. .

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Design of Compact Dual-Band Microstrip Patch Antenna

Table of contents

In recent years, with the advance o f technology, the demand for an antenna operating a1 mutibands i s increasing rapidly. Such as GPS and K-PCS, The multi-hand antennas with one feeding pon use the multiple resonance technolagy[l] such antennal are difficult lo provide a good polarization efficiency for GPS signal reception.

So the integrated GPSIK-PCS dual-band antenna using two feeding pan has been proposed in this paper. Referenced dual-band antenna using two feeding pon has matched poiariration of integrated system. [2] but it has large size. Proposed antenna uses miniafurizalion technique that is to insect ilits. This technique is to increase elecVlcal surface length by slits. [3-5] Operating frequency o f proposed Bntenna is greatly lowered by slit. Meander line patch and square ring patch with four diu o f proposed antenna are about 70% and 50% ofreferenced antenna size.

The proposed antenna composed of a low-profile cylindrical monopole with a top-loaded meander line patch for K-PCS Operation, and a comer-truncated square-ring microstrip patch antenna with four-slits for GPS ooeration. The proposed antenna has the common ground plane, but i s fed by separate feeding pon. The antenns for GPS-hand i s realized by using a corner-truncated square-ring microstrip patch with four slits.

The outer side length and inner ride length are40mm, printed on a rubrtrale o f thickness 1. 6mm(h) and y, relative peminiviry (e, :4. 4). The middle ofthe substrate is removed for inner rectangular d i t area ( b x b ) of patch. Feed position for right-hand circularly polarized (RHCP) wave operation is placed along x-axis. and the distance of the probe feed away fram the patch center i s denoted as 6 . 6 m m ( / ) . The four-rlitr at the comers are of equal length I3. 5mm(S)and width Imm(w).

It i s noted that the reSonant frequency rapidly lowered with increasingdesign parameter(S). In  way, the excited surface current paths are lengthened in the propo~ed designs, and the operating frequency is greatly lowered.  Also, the shorted meander line patch antenna with low-profile cylindrical monopole top is loaded at the center of square ring patch for K-PCS operation. For brbadband characteristic, cylindrical monopole has a large diameter of 6. 2mm(d,) and l e n ~ h 10. 7mm(h2). The eander line patch has a ride lengh Z l m m ( p ) and is connected to the common ground by two same shorting posh, which have a diameter of 2. 2mm(d2). By varying ofthe shorting ports diameter(d2), good impedance matching can easily be obtained. Meander line patch size can be reduced by increasing inserted slit length. Because of the antenna for K-PCS operation interfere the axial mtio of GPS receiving antenna, the miniatufimion of GPS antenna is limited.

According to the experiment, the patch size of GPS antenna for circular polarized operation must he over about twice the size of KPCS antenna with meander line suunurc. In the proposed designs, the bandwidth of3-dB axial mtio is about 13 MHz, which is much larger than that required for GPS operation at 1575 MHz.

The isolation between the two feeding pons of the PCS and GPS elemenls is less than -17dB. Measured radiation panems of the proposed antenna at l8OOMHz and ISROMHz are presented in Figure 5 and 6, respectively. The K-PCS antenna radiation panem at IROOMHz shows a monopole radiation panem, 10 this fype of antenna is suitable for applications on a vehicular communication system. For the GPS anfenna at ISROMHz, good broadside band radiation panem is obtained. Far K-PCS operation the measured pea antenna gains is about 2. 4dBi and t h c gain variations are within O. JdBi, for GPS operation the measured peak antenna gains is about 7. dBi and the vanations of gain does not exist.

Conclusion

Proposed antenna has a integrated slmcturc of microitrip patch antenna with two feeds for dual-band oprmtion(GPSiK-PCS). A low-profile cylindrical monopole with a shorted meander line patch i s loaded for K-PCS operation, which rhowr a linearly polarized monopole patkm with broadband characterirlic. The radiating clement for GPS operation is a novel square-ring microstip path with truncated comers with four slits, which provide circularly polarized braadrids radiation panemr. size reduction of proposed antenna is achieved by using slits.

Meander line patch and square ring patch with four . lib of proposed antenna are about 70% and SO% of referenced antenna sire. As the proposed antenna has a compact size for dual band operation, it will be suitable for practical vehicular mobile communication antenna applications.

Refereces

  1. R. Kronberger, H. Lindenmcier, L. Reiter, J. Hapf, ” Multi hand planar Invencd-F C r a Antenna for Mobile Phone andGPS,”2714p-Z717p,AP confer. 1999 3530
  2. I. Y. Wu and K. L. Wong, “Two inlegraled stacked shorted patchantennas for DCSiGPS operations,” Micra wave Opt. Techno1 . Len. , Vol. 30. July, 2001.
  3.  S. Reed, L. Desclar, C. Terref, and S. Toutain, “Patch Antenna Size Reduction By Means Oflnductive Slots,” Micro wave Opt. Teehnol. Len. ,Vol29. Apri, 2001.
  4. J. Y. Wu and K. L. Wong, “Single-feed Square-ring Microstip Antenna wilh lruncated comers for Compact ~ircularpolarization Operation,” Electronics lea. , Vol. 34, May,1998.
  5. W. S. Chen, C. K. Wu, and K. L. wong. I’ Novel Compact Circularly polarized Square Microstrip Antennq” IEEE Trans. ,Antennas Propagat. , Vol. 49, March, 2001,

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Programmable Logic Devices (Pld)

PLDs are standard ICs, available in standard configurations. They are sold in high volume to many different customers. PLDs may be configured or programmed to create a part customized to a specific application.

They have a single large block of programmable interconnect and consist of a matrix of logic macrocells that usually consists of programmable array logic followed by a flip-flop or latch. Types of PLDs are PROM, EPROM, PAL and PLA. PROM uses metal fuse that can be blown permanently.

EPROM uses programmable MOS transistors whose characteristics are altering by applying a high voltage. PAL or Programmable Array Logic consists of a programmable AND logic array or AND plane, and fixed OR plane.

PLA or Programmable Logic Array has a programmable AND plane followed by programmable OR plane. Based on type of programming PLDs may be classified as Erasable PLD (EPLD) and Mask-programmed PLD. It is characterized by customized mask layer and logic cells (Smith, 1997: 14). (Smith, 1997) Advantages Fast design turnaround. Disadvantages Mass programming is not possible.

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Biography of Dr.Jose Rizal

This is not so! To support this argument Michael Faraday is the perfect example. Faraday didn’t receive a formal education, yet through the dint of hard work and sheer determination he became one of the 19’Th Century. Michael Faraday belonged to the poor family of a blacksmith. His parents were so poor that they were not able to send Faraday to school. At a time when all boys of his age went to school, Faraday was ngaged in menial work.

Due to the crushing poverty of his family, Faraday was forced to take up several odd Jobs that taught him how to fend for himself when he was still a minor. However, in the course of time, Faradays hard work and a flair for science made him one of the most successful scientists of his time in England. Faraday took deep interest in science and made a significant contribution to the study of physics and chemistry. Faraday had an extraordinary number of ingenious ways to work out on scientific methods. This special ability of Faradays astonished many renowned scientists of his time.

Faraday was the first scientist who succeeded in liquefying a permanent gas. This was without doubt a great discovery of his time. Moreover, Faraday is much acclaimed for his major contribution to electricity and magnetism. It was Faraday who laid the foundation of the electric motor, the generator, the transformer, etc. As with physics Faraday was also interested In chemistry. He discovered benzene and used it for different purposes In fact, Faraday didn’t have a university education; but he was still unanimously appointed professor of chemistry at the Royal Institution.

This was the acknowledgement of his rofound knowledge and Ingenious capacity to deal with scientific methods. Faradays lectures on science were highly knowledge and fully of witty remarks. In order to give due respect to Michael Faraday, a unit of electricity was named after him. It is called “Farad” this Is the unit to measures an amount of electrical charge. In the course of time, Faraday developed generators and transformers which were regarded as major Inventions of 19’Th century. Not only this, Faraday Is also remembered for having coined new technical words used In electricity Ilke Ion, electrode, cathode, and anode etc.

MICHAEL FARADAY was born on September 22, 1791, In Newington Butts, London In 1786. By profession, Mr. James Faraday and Mrs. Margaret Hastwell migrated from Clapham, Yorkshire, to London In 1786. By profession, Mr. James Faraday was a blacksmith, and he was managing to survive on a very meager Income. Faradays early childhood was spent In poverty and hardship. When Faraday was a young boy of ten, he saw all his playmates going to school. Like many other boys, Faraday also wanted go to school , therefore he repeatedly Implored his father to send him to school but his father would say , “next year”, and that next year never came.

As a result , all his life Faraday was deprived of school and a university education. Actually Mr. Faraday wanted to send his son to school , but he was simply unable duo to his very poor financial state. HIS Income was quite low and also not very reliable. Due to such an erratic Income from his profession Mr. Faraday could not send his son to send him to a school. “l should do something to educate myself. ” Although Faraday was not going to school, he had an unusual obsession for reading and collecting books of all kinds. His interest chiefly lay in science.

He began to collect good books o matter how expensive they were and , to meet the expenses of buying books ; Faraday began to do all sorts of odd Jobs that came his way. Faradays love for books was well known among his friends. One fine morning, Faraday was going to a Job when he met one of his bosom pals, he informed Faraday about a Job opportunity available in a bookbinding shop. This was absolutely fabulous news for Faraday because he knew working in a bookbinding shop meant getting an opportunity to read plenty of books.

Faraday immediately changed direction and headed towards the bookbinder’s shop and asked the owner for the Job. The owner of the bookbinding shop was Mr. Riebau who was a kind man. He agreed to employ Faraday on a nominal wage, but for Faraday a Job in a bookbinding shop was more valuable than any wage. Faraday was extremely happy with his new Job. He would go to work well before the duty time and leave late in the evening. Faraday would also bring some books with him whose delivery was to be made little late. Faraday started serious study of any science books which fell into his hand.

He had taken a keen interest in science , but especially in physics and chemistry. It became a routine for Faraday to study late into the night , but sometimes he would even remain awake for the whole night and read an entire book in a single sitting. Faraday worked in Mr. Riebau’s bookbinding shop for over eight years. After 8 years of service in Mr. Riebau’s shop , Faraday then Joined in Mr. De La Roche’s bookbinding shop. Here too Faraday did his work with complete dedication and gave his mater no opportunity to make a complaint against him.

During this period Faraday had successfully managed to collect his own personal library which he kept in his little bedroom where he would study physics and chemistry with complete dedication. While reading science and the works of great scientists , Faraday began to nurture a desire of becoming a scientists deep in his heart. One day a satisfied costumer gave a ticket to Faraday. The ticket was a gate-pass to attend lecture of Sir Humphrey Daw at Royal Institute. Faraday was very grateful to the gentleman who have him the ticket as he was very eager to attend the lectures.

On the day of Daws lectures Faraday reached the hall almost an hour early and secure his seat in the first row so that he could see and hear Daws lecture clearly. One by one Faraday attended all the lectures of Sir. Humphrey Daw. Sir Humphrey Daws learned lectures left a profound impression on Faraday. While Sir Daw was delivering lectures , Faraday has noted down every single important fact in his notebook. Later he carefully studied those notes and wrote several pages which he made into a thick book and went straight to Humphrey Daws house.

Faraday handed over this book to Sir Humphrey Daw and requested him to read in his leisure time. Sir Daw studied Faradays book and found it very interesting. A few days later Faraday asked Sir Daws opinion about his book , Sir Daw said he was impressed by his work and these words of Sir Daw were more than enough to nspire a young man like Faraday. Faradays meeting with Sir Daw left a good impression upon Sir Daws mind. A few months later Faraday sought a Job in Sir Daws laboratory, because he was eager to see scientific experiments close-up. as extremely glad as he had the opportunity to work under the guidance of Sir Daw, a renowned scientist of his time. Faraday was very delighted in order to improve his understanding of science. Sir Daw taught him several important aspects of physics and chemistry that tremendously helped to expand Faradays mental horizon . Sir Daw was also very satisfied at seeing Faradays rapid progress as he was picking up verything very quickly. After one year of hard work , Faraday has the opportunity to be one of the members of Sir Daws entourage on a European tour.

On this important tour , Sir Daw delivered many erudite lectures that Faraday had noted down in his notebooks. Faraday had also received some rare opportunities to meet with some renowned scientists. Faraday duly capitalised on this opportunity to improve his scientific Knowledge. While Faraday was doing very well in science , Mrs. Daw never treated Faraday as more than a servant , but Faraday never made any complaint about her obnoxious behaviour to Sir Daw. Faraday remained a through gentleman all his life. Upon his return from the tour on 1815 , Faraday became even more ambitious to be a scientist then he was before.

Now he wanted to establish his own identity as a scientist rather than Just as a working assistant in Sir Daws laboratory. So Faraday began to study will all his ability. Faraday seriously began making a series of experiments until late into the night. On the basis of his long-time experiments and through study of science. He eventually developed electromagnetic rotations. Faraday showed his discoveries to Sir Daw and asked his opinion for its publication n the scientific Journal, but Sir Daw delayed giving his opinion on Faradays discoveries and that soured their relationship.

Sir Daw did not acknowledge Faradays achievement at the first sight and never gave the ideas for this. Anyway , Faraday was most embarrassed at receiving such a cold reception from Sir Daw. However , without getting Sir Daws approval, Faraday published his works on electromagnetic rotation. When Faradays papers were published in a reputed science Journal, Sir Daw blamed Faraday for publishing his papers without his acknowledgement. After the publication of Faradays papers in the science Journal hose scientists who disliked Faraday accused him of stealing or plagiarizing the ideas of other scientists.

Faraday did not lend an ear to the clamor his opponents were making, Instead Faraday went on with more experiments and published many scientific papers in several Journals. Faraday succeeded to liquefy chlorine in 1823 and proved that a gas can also be liquefied. Slowly but steadily , Faraday was emerging from obscurity into the limelight as a rising scientist. Faraday submitted an application to the Royal Institute in 1824 and sought to be elected a fellow of the Royal Institute , but his application was ruthlessly turned down.

Later it was suspected that actually Sir Daw did not want to see Faraday sitting equal to him. In spite of Sir Daws strong opposition , the following year Faraday was elected a fellow of the Royal Society and later directory of the laboratory of the Royal Institute. Faraday took special interest in the study of electromagnetic function. After a series of experiments , he discovered electromagnetic induction , the battery , the electric arc , and electrostatics. These were some of the major discoveries which duly lifted eputation to a new height as a most brilliant scientist.

The loads of work and staying up late into night caused severe harm to his health. Due to heavy workload, he often Faraday complained of losing his memory and that made him unable to write about studying or experiment on new things as freely as he wanted. Faraday passed away peacefully at the age of 76 in his arm chair on August 25 , 1867. Faraday discoveries and inventions created new avenues in the field of science and technology. Faraday was without doubt one of the foremost scientist who set the foundations of scientific discovery.

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Improved Fast Decoupled Power Flow

The power flow analysis is a very important and tundamental tool in power system analysis. Its results play the major role during the operational stages of any system for its control and economic schedule, as well as during expansion and design stages The purpose of any load flow analysis is to compute precise steady-state voltages and voltage angles of all buses in the network, the real and reactive power flows into every line and transformer, under the assumption of known generation and load.

During the second half of the twentieth century, and after the large technological evelopments in the fields of digital computers and high-level programming languages, many methods for solving the load flow problem have been developed, such as indirect Gauss-Siedel (bus admittance matrix). direct Gauss-Siedel (bus impedance matrix).

Newton-Raphson (NR) and its decoupled versions Nowadays, many Improvements have been added to all these methods involving assumptions and approximations of the transmission lines and bus data, based on real systems conditions The Fast Decoupled Power Flow Method (FDPFM) is one of these improved methods, which was based on a simplification of the Newton-Raphson method and reported by Stott and Alsac in 1974[4]. This method and due to its calculations simplifications, fast convergence and reliable results became the most widely used method in load flow analysis.

However, FDPFM for some cases, where high RA ratios or heavy loading (Low Voltage) at some buses are present, does not converge well. For these cases, many efforts and developments have been made to overcome these convergence obstacles. some of them targeted the convergence of systems with hgh RIX ratios, others those with low voltage buses However, one of the most recent developments is a Robust Fast Decoupled Power Flow developed by Wang and u; it Is ased on heuristic justification and general voltage normalization methods [171 and solves both high RIX ratios and low bus voltages problems simultaneously.

Though many efforts and elaborations have been achieved in order to improve the and simulations are becoming more developed and are now able to handle and analyze large size system. Today, and after reaching processor’s speeds higher than 3 GHz, any improvement in the speed of convergence of the power flow method, provided it leads to reliable results, is of great value. This speed improvement is very important when involved in operational stages of power distribution, where any illisecond saving can hugely increase the probability of the right decision, of the control and dispatch computerized system.

This paper works on providing computing savings (in flops) and thus higher speed of convergence of the FDPFM based on the initial approximation in which real power changes are considered to be most sensitive to variations in voltage angle and much less to those of voltage magnitude, as well as on the high sensitivity of reactive power changes to variations in voltage magnitude and much less to those of voltage angle. In this paper, the attention was focused on the update of the voltage angle (6) and oltage magnitude (V) in each iteration, based on the improvement of flops achieved, and obviously on the results obtained.

The results of these improvements and the comparative analysis with the Newton-Raphson and classical FDPFM will be presented using the three IEEE bus systems of 14, 30 and 57-bus, although the IFDPFM can be applied to any size bus system. II. Fast Decoupled Power Flow Method As the FDPFM is derived from the Newton-Raphson we will start from the matrix representation of NR, apply some simplifications and approximations, to reach the equations of the FDPFM.

The matrix representation of the N-R method [17] is: O APOOH Where I IVJI IYiJl +6]) And -2 cos Bit +2 cos -6i +6]) Nii – = I VI II YiJ I cos (B iJ- 6i + 6]) Nil (7) -2 IYiil stn +2 IVJI IYiJl cos -6i +6]) Now, for typical power system branches: XIR and ; 200 (10) between AQ and A6, hence N and J entries of the initial matrix of (1) can be ignored leading to the following decoupled equations: (12) Now, the diagonal elements of H according to Stott and Alsac [4] can be written as: IVi12Bii (13) Where Bii = I Yill sin Bii is the imaginary part of the diagonal elements of the bus admittance matrix Ybus.

Further simplifications can be applied to equation (12), by considering Bii Qi and I Vil 2 z I Vil yielding to the following simplified Hit: Hii=- (14) Also, as under normal operating conditions 6] – 6i is quite small, thus Bii – 6i + 6] Bit, and IVJI 1, the off-diagonal elements of the matrix H can be written as: HIJ I Vil (15) Similarly, the diagonal elements of the L matrix can be written as: Lil ” (16) And its off- diagonal elements as: LiJ=-lVll (17) Applying these assumptions to equations (11) and (12) we get: =-B’A6 I vil (18) (19) where B’ and B” are the imaginary part of the bus admittance matrix Ybus , such that

B’ contains all buses admittances except those related to the slack bus, and B” is B’ deprived from all voltage-controlled buses related admittances. Finally, all these approximations and simplifications lead to the following successive voltage magnitude and voltage angle updating equations: (20) IVI (21) These equations formed the basis of the iteration scheme upon which the Matlab software written and then updated. Ill.

Updated Algorithm The algorithm written according to the equations derived in the previous section is as follows: Step 1: Creation of the bus admittance Ybus according to the lines data given y the IEEE standard bus test systems. Step 2: Detection of all kinds and numbers of buses according to the bus data given by the IEEE standard bus test systems, setting all bus voltages to an initial value of 1 pu, all voltage angles to O, and the iteration counter iter to O.

Step 3: Creation of the matrices B’ and B” according to equations (18) and (19). Step 4: If max (AP, AQ) accuracy then Go to Step 6 else 1. Calculation of the H and L elements of equations (14), (1 5), (16), (17). 2. Calculation of the real and reactive power at each bus, and checking if Mvar of generator buses re within the limits, otherwise update the voltage magnitude at these buses by ?±2 3. Calculation of the power residuals, AP and AQ. 4.

Calculation of the bus voltage and voltage angle updates AV and A6 according to equations (19) and (20). 5. Update of the voltage magnitude V and the voltage angle 6 at each bus. 6. Increment of the iteration counter iter = iter + 1 then Go to Step 4 Print out ‘Solution did not converge’ and go to Step 6 Step 6: Print out of the power flow solution, computation and display of the line flow and losses. The update of this algorithm was based on the weak coupling between AP and AV, nd between AQ and A6, explained in the previous section.

Specifically, in the fourth subroutine of Step 4 of the initial algorithm, and instead of updating the voltage magnitude and the voltage angle once and simultaneously in each iteration, the improved algorithm updated either the voltage angle or the voltage magnitude at each bus, Jumped to subroutine 1 to recalculate the real and reactive power and then updated the second variable based on what was updated first.

Moreover, and for more speed improvements and convergence reliability, the update of one of the two variables was repeated several times, holding the other ariable at its last calculated value, which reduced the number of floating point operations of the algorithm and thus lead to the faster convergence of the IFDPFM. IV. Numerical Analysis The performance of the IFDPFM was tested on IEEE 14, 30 and 57-bus systems with a convergence accuracy of 10-3 on a MVA base of 100 or equivalently 10-1 MVA for both power residuals AP and AQ.

This numerical analysis involved a speed comparison between the NR method, the FDPFM and the IFDPFM based on the number of flops (floating point operations) of each algorithm implementing each method, rather than on any other basis, because he flops count is independent from the CPU speed or the specific programming language used. In addition, as mentioned in the previous part, the algorithm of this paper updated the voltage angle several times before updating the voltage magnitude or vice versa which resulted in a different flops count for each combination used for the same IEEE bus system.

These combinations will be noted according to the number of loops of update of each variable. For instance, updating twice the voltage angle (6) and then once the voltage magnitude (V) in the same iteration will be written as (2;1). Note that any flops number without the previous notation will be the one of the best case of the updated algorithm. Moreover, for any combination to be listed in this paper it should have satisfied the condition of no more than 3 % deviation of its results from that of the NR method.

The bar graph in Figure 1 shows a comparison based on the number of flops between the NR, FDPFM and the best case of IFDPFM for the three IEEE standard bus systems used in this paper. Number of flops per method per system 934. 573 305. 126 314. 925 157. 310 System 57 4,421. 752 2,841. 646 14 30. 823 56. 829 24. 574 1 ,ooo ,500 2,000 2,500 3,000 Flops IFDPFM FDPFM 4,000 4,500 (Thousands) Fig. 1: Flops Comparison between the 3 methods. It is clearly seen that the IFDPFM requires much less flops to converge as compared to FDPFM or NR.

This flops saving is proportional to the system size and as shown, increases with the increase of the number of buses. Obviously, this improvement in the number of flops will make the IFDPFM converge much faster than the two other methods whatever CPU used. Numerically, and for the biggest system involved in this paper (IEEE 57-Bus System), the IFDPFM revealed a flops saving of about 67 % when ompared with the FDPFM and about 78 % when compared with the NR.

Normally, and as mentioned before, this saving goes down to the order of 50 % for the two smaller bus systems. In addition, and in order to reach the best case presented above, different strategies of updating the voltage angle (6) and the voltage magnitude (V) were tested and compared first with the FDPFM then with the NR. Figure 2 below the percentage of flops of IFDPFM versus that of the FDPFM, for 10 different updating strategies and for the three IEEE systems.

Percentage Flops IFDPFM vs FDPFM 75 50 25 Delta;Voltage Loops IFDPFM14 IFDPFM30 IFDPFM57 Fig. 2: % of flops of IFDPFM vs. FDPFM for different voltage angle and voltage magnitude updating strategies. At the first look, it is seen that for the three systems, three parallel curves are sketched with most values less then 75 % of the FDPFM. This parallel property of this graph shows the consistency of the algorithm in its number of flops variation for each strategy for each system studied.

Also, it is seen that for low number of voltage magnitude and voltage angle loops the IFDPFM can’t be more efficient than FDPFM, but for a slightly higher number the IFDPFM shows great improvement in flops saving nd reaches the highest improvement at the point (4;3), where in each iteration, the voltage angle was updated four times while the voltage was kept at its initial value and then 6 was kept at its last value and V updated three times.

Numerically, and for the best case of IFDPFM (4;3), the new algorithm showed a flops saving of 57 % for the 14-bus system, 50% for the 30-bus system, and 68% for the 57-bus system. Figure 3 below shows the percentage of flops of IFDPFM versus that of the NR, for 10 different updating strategies and for the three IEEE systems. IFDPFM vs NR 175 150 25 Fig. 3: % of flops of IFDPFM vs. NR for different voltage angle and voltage magnitude updating strategies.

Basically, the same comments of the comparison of IFDPFM with FDPFM apply in this comparison. However, here the flops saving is much more significant and is proportional to the system size. Numerically, we have a 21 % flops saving for the 14-bus system, 49 % for the 30-bus system and 78% for the 57-bus system. Finally, it is remarked that when compared with NR, IFDPFM savings showed a high variation in their percentage, mainly because they are highly proportional to the

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Volume Variety Matrix

Volume-variety and design In Chapter 1 the four V’s of operations were described. These were volume, variety, variation and visibility. The first two of these – volume and variety – are particularly important when considering design issues in operations management. Not only do they usually go together (high variety usually means low volume, high volume normally means low variety) but together they also impact on the nature of products and services and processes which produce them. The volume and variety of an operation’s activities are particularly influential in determining the way it thinks about its performance objectives.

The figure below illustrates how the definitions of quality, speed, dependability, flexibility and cost are influenced by the volume-variety position of the operation. [pic] Quality Quality in a low volume-high variety process such as an architects’ practice, for example, is largely concerned with the final aesthetic appearance of the building and the appropriateness of its detailed design. In an exceptionally high volume-low variety process, such as an electricity supply company, quality is exclusively concerned with error-free service – electricity must be constantly available in the correct form (in terms of voltage, frequency, etc. . The meaning of quality has shifted from being concerned primarily with the performance and specification of the product or service towards conformity to a predefined standard, as we move from low volume-high variety operations through to high volume-low variety operations. Speed Speed for the architects’ practice means negotiating a completion date with each client, based on the client’s needs and the architects’ estimates of how much work is involved in each project. Speed is taken to its extreme in the electricity utility where speed means literally instant delivery.

No electricity company could ask its customers to wait for their ‘delivery’ of electricity. Speed therefore means an individually negotiated delivery time in low volume-high variety operations, but moves towards meaning ‘instant’ delivery in some high volume-low variety operations. Dependability Dependability in processes such as the architects’ practice means keeping to each individually negotiated delivery date. In continuous operations, dependability often means the availability of the service itself. A dependable electricity supply is one which is always there.

So dependability has moved from meaning ‘on-time delivery’ in low volume-high variety operations to ‘availability’ in high volume-low variety operations. Flexibility Flexibility in low volume-high variety processes such as the architects’ practice means the ability to design many different kinds of buildings according to its clients’ various requirements. With the electricity company’s process, the need for product flexibility has disappeared entirely (electricity is electricity, more or less) but the ability to meet almost instantaneous demand changes through volume flexibility is vital if the company is to maintain supply.

Flexibility has moved from meaning product flexibility in low volume-high variety operations to volume flexibility in high volume-low variety operations. Cost Cost, in terms of the unit cost per product or service, varies with both the volume of output of the operation and the variety of products or services it produces. The variety of products or services in low-volume operations is relatively high, which means that running the operation will be expensive because of the flexible and high skill levels employed. Further, because the volume of output is relatively low, a few products or services are bearing the operation’s high cost base.

Also, and more significantly for the operation, the cost of each product or service is different. At the other end of the scale, high-volume operations usually produce similar products or services, output is high, so that whatever the base cost of the operation, it is shared among a high number of products or services. Cost per unit of output is therefore usually low for operations such as the electricity utility but, more significantly, the cost of producing one second of electricity is the same as the next second. Cost is relatively constant. Copyright © 1995-2010, Pearson Education, Inc. Legal and Privacy Terms | [pic] [pic] [pic] [pic] LINE. When product demand is high enough, the appropriate process is the assembly line. Often, this process (along with continuous; both are in the lower-right quadrant of the matrix) is referred to as mass production. Laborers generally perform the same operations for each production run in a standard and hopefully uninterrupted flow. The assembly line treats all outputs as basically the same.

Firms characterized by this process are generally heavily automated, utilizing special-purpose equipment. Frequently, some form of conveyor system connects the various pieces of equipment used. There is usually a fixed set of inputs and outputs, constant throughput time, and a relatively continuous flow of work. Because the product is standardized, the process can be also, following the same path from one operation to the next. Routing, scheduling, and control are facilitated since each individual unit of output does not have to be monitored and controlled.

This also means that the manager’s p of control can increase and less skilled workers can be utilized. The product created by the assembly-line process is discrete; that is, it can be visually counted (as opposed to continuous processes which produce a product that is not naturally divisible). Almost everyone can think of an example of assembly-line manufacturing (automobile manufacturing is probably the most obvious). Examples of assembly lines in services are car washes, class registration in universities, and many fast food operations.

Because the work-in-process equipment is organized and sequenced according to the steps involved to produce the product and is frequently connected by some sort of conveyor system, it is characterized as flowing in a line. Even though it may not be a straight line (some firms utilize a U-shaped assembly line) we say that it has a connected line flow. Also, firms in the lower-right quadrant (line and continuous) are classified as having a product layout. Continuous manufacturing involves lot-less production wherein the product flows continuously rather than being divided. A basic material is passed through successive operations (i. e. refining or processing) and eventually emerges as one or more products. This process is used to produce highly standardized outputs in extremely large volumes. The product range is usually so narrow and highly standardized that it can be characterized as a commodity. Considerable capital investment is required, so demand for continuous process products must be extremely high. Starting and stopping the process can be prohibitively expensive. As a result, the processes usually run 24 hours a day with minimum downtime (hence, continuous flow). This also allows the firm to spread their enormous fixed cost over as large a base as possible.

The routing of the process is typically fixed. As the material is processed it usually is transferred automatically from one part of the process to the next, frequently with self-monitoring and adjusting. Labor requirements are low and usually involve only monitoring and maintaining the machinery. Typical examples of industries utilizing the continuous process include gas, chemicals, electricity, ores, rubber, petroleum, cement, paper, and wood. Food manufacture is also a heavy user of continuous processing; especially water, milk, wheat, flour, sugar and spirits.

Read more: Product-Process Matrix – strategy, organization, system, examples, manager, company, business, competitiveness, system http://www. referenceforbusiness. com/management/Or-Pr/Product-Process-Matrix. html#ixzz24d4V1uTD [pic] [pic] USING THE MATRIX The product-process matrix can facilitate the understanding of the strategic options available to a company, particularly with regard to its manufacturing function. A firm may be characterized as occupying a particular region in the matrix, determined by the stages of the product life cycle and its choice of production process(es) for each individual product.

By incorporating this dimension into its strategic planning process, the firm encourages more creative thinking about organizational competence and competitive advantage. Also, use of the matrix provides a natural way to involve manufacturing managers in the planning process so they can relate their opportunities and decisions more effectively with those of marketing and of the corporation itself, all the while leading to more informed predictions about changes in industry and the firm’s appropriate strategic responses. Each process choice on the matrix has a unique set of characteristics.

Those in the upper-left quadrant of the matrix (job shop and batch) share a number of characteristics, as do those in the lower-right quadrant (assembly line and continuous). Upper-left firms employ highly skilled craftsmen (machinists, printers, tool and die makers, musical instrument craftsmen) and professionals (lawyers, doctors, CPAs, consultants). Hence upper-left firms can be characterized as labor intensive. Since upper-left firms tend to utilize general-purpose equipment, are seldom at 100 percent capacity, and employ workers with a wide range of skills, they can be very flexible.

However, there is a difficult trade-off between efficiency and flexibility of operations. Most job shops tend to emphasize flexibility over efficiency. Since efficiency is not a strong point of upper-left firms, neither is low-cost production. Also, the low volume of production does not allow upper-left firms to spread their fixed costs over a wide enough base to provide for reduced costs. Finally, upper-left firms are also more likely to serve local markets. Lower-right firms require production facilities that are highly specialized, capital intensive, and interrelated (therefore, inflexible).

Labor requirements are generally unskilled or semi-skilled at most. Much of the labor requirement deals with merely monitoring and maintaining equipment. Lower-right firms are also more likely to serve national markets and can be vertically integrated. Hayes and Wheelwright relate three areas affected by the use of the product-process matrix: distinctive competence, management, and organization. DISTINCTIVE COMPETENCE. Distinctive competence is defined as the resources, skills, and organizational characteristics that give a firm a comparative advantage over its competitors.

Simply put, a distinctive competence is the characteristic of a given product that causes the buyer to purchase it rather than the similar product of a competitor. It is generally accepted that the distinctive competencies are cost/price, quality, flexibility and service/time. By using the product-process matrix as a framework, a firm can be more precise about its distinctive competence and can concentrate its attention on a restricted set of process decisions and alternatives and a restricted set of marketing alternatives.

In our discussion, we have seen that the broad range of worker skills and the employment of general-purpose equipment give upper-left firms a large degree of flexibility while the highly specialized, high-volume environment of lower-right firms yields very little in the way of flexibility. Therefore, flexibility would be a highly appropriate distinctive competence for an upper-left firm. This is especially true when dealing with the need for flexibility of the product/service produced. Lower-right firms find it very difficult to sidetrack a high-volume operation because of an engineering change in the product.

An entire line would have to be shut down while tooling or machinery is altered and large volumes of possibly obsolete work-in-process are accounted for. Upper-left firms, however, would have none of these problems with which to contend. It must be noted though that lower-right firms may possess an advantage regarding flexibility of volume. Quality may be defined a number ways. If we define quality as reliability, then lower-right firms could claim this as a distinctive competence. Lower-right firms would have the high volume necessary to quickly find and eliminate ugs in their product, yielding more reliability to the end user. However, if we define quality as quality of design (that is, “bells and whistles”—things that embody status, such as leather seats in an automobile or a handcrafted musical instrument), then quality would be seen as a possible distinctive competence of upper-right firms. Service may also be defined in more ways than one. If one defines service as face-to-face interaction and personal attention, then upper-left firms could claim service as a distinctive competence. If service is defined as the ability to provide the product in a very short period of time (e. . , overnight), then service as a distinctive competence would belong to lower-right firms. Finally, remember that high volume, economies of scale, and low cost are characteristics of firms in the lower-right quadrant of the matrix. Upper-left firms produce low volumes (sometimes only one) and cannot take advantage of economies of scale. (Imagine, for instance, what you would have to pay for a handcrafted musical instrument. ) Therefore, it is obvious that price or cost competitiveness is within the domain of lower-right firms. MANAGEMENT.

In general, the economics of production processes favor positions along the diagonal of the product-process matrix. That is, firms operating on or close to the diagonal are expected to outperform firms choosing extreme off-diagonal positions. Hayes and Wheelwright provide the example of a firm positioned in the upper-right corner of the matrix. This would appear to be a commodity produced by a job shop, an option that is economically unfeasible. A firm positioned in the lower-left corner would represent a unique one-time product produced by a continuous process, again not a feasible option.

Both examples are too far off the diagonal. Firms that find themselves too far off the diagonal invite trouble by impairing their ability to compete effectively. While firms operating in the near vicinity, but not exactly on the diagonal, can be niche players, positions farther away from the diagonal are difficult to justify. Rolls Royce makes automobiles in a job shop environment but they understand the implications involved. Companies off the diagonal must be aware of traps it can fall into and implications presented by their position. Also, a firm’s choice of roduct-process position places them to the right or left of competitors along the horizontal dimension of the matrix and above or below its competitors along the vertical dimension of the matrix. The strategic implications are obvious. Of course, a firm’s position on the matrix may change over time, so the firm must be aware of the implications and maintain the capability to deal with them appropriately. The matrix can provide powerful insights into the consequences of any planned product or process change. Use of the product-process matrix can also help a firm define its product.

Hayes and Wheelwright relate the example of a specialized manufacturer of printed circuit boards who produced a low-volume, customized product using a highly connected assembly-line process. Obviously, this would place them in the lower-left corner of the matrix; not a desirable place to be. This knowledge forced the company to realize that what they were offering was not really circuit boards after all, but design capability. So, in essence, they were mass-producing designs rather than the boards themselves. Hence, they were not far off the diagonal at all.

ORGANIZATION. Firms organize different operating units so that they can specialize on separate portions of the total manufacturing task while still maintaining overall coordination. Most firms will select two or more processes for the products or services they produce. For example, a firm may use a batch process to make components for products, which are constructed on assembly lines. This would be especially true if the work content for component production or the volume needed was not sufficient for the creation of a dedicated line process.

Also, firms may need separate facilities for different products or parts, or they may simply separate their production within the same facility. It may even be that a firm can produce the similar products through two different process options. For example, Fender Musical Instruments not only mass produces electric guitars (assembly line) but also offers customized versions of the same product through the Fender Custom Shop (job shop). Again, the matrix provides a valuable framework for diagnostic use in these situations.

OTHER USES OF THE PRODUCT-PROCESS MATRIX Additional uses of the matrix include: • Analyzing the product entry and exit. • Determining the appropriate mix of manufacturing facilities, identifying the key manufacturing objectives for each plant, and monitoring progress on those objectives at the corporate level. • Reviewing investment decisions for plants and equipment in terms of their consistency with product and process plans. • Determining the direction and timing of major changes in a company’s production processes. Evaluating product and market opportunities in light of the company’s manufacturing capabilities. • Selecting an appropriate process and product structure for entry into a new market. It should be noted that recent empirical research by Sohel Ahmad and Roger G. Schroeder found the proposed relationship between product structure and process structure to be significant but not strong. In general terms, they found that as the product life cycle changes the process life cycle also shifts in the consistent direction, but not necessarily along the diagonal.

Some 60 percent of the firms studied did not fall on the diagonal. The researchers propose that this occurred because new management and technological initiatives have eliminated or minimized some of the inherent trade-offs found on the Product-Process Matrix. They classify these initiatives as processing technology, product design and managerial practice (e. g. , TQM and JIT). Therefore, Ahmad and Schroeder recommend that the matrix be conceptualized as having three axes instead of two.

They propose an x-axis (product life cycle stages), a y-axis (process life cycle stages), and a z-axis that represents an organization’s proactive effort towards adopting and implementing these innovative initiatives. As a firm moves away from the origin along the z-axis, it becomes able to minimize some of the trade-offs seen in the Product-Process Matrix framework. Read more: Product-Process Matrix – strategy, organization, system, examples, manager, company, business, competitiveness, system http://www. referenceforbusiness. com/management/Or-Pr/Product-Process-Matrix. h tml#ixzz24d4lyOQ5 [pic] [pic] [pic] [pic] [pic] [pic] [pic] [pic]

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