Activity Cycle Diagram And The Condition Specification Computer Science Essay

Activity Cycle Diagram And The Condition Specification Computer Science Essay Many descriptive and symbolic techniques for representation of the simulation of a model are present in literature. Some of these techniques are better with one model while not better with the representation of the other one. Two most important techniques for representation of model simulation are known as Activity Cycle Diagram and the Condition specification. The activity cycle diagram (ACD) has been used an ideal technique to represent a model. The technique is based on Tochers idea of stochastic gearwheels (quoted in Paul et al 1993. The ACD represents the activities of a model with its entities by composing their life cycles. The entity could be a passive state as Queue or an active state as activity. The Queue and activity are represented in ACD with specific symbols. Part A Specification of the model domain A part enters a cell where it is first loaded onto machine 1. After this operation the part is either loaded immediately on to machine 2, or if that machine is busy, it is moved to a buffer area. After the operation on machine 2, the part leaves the system. All movements are carried out by a robot. The entities in the system and their possible states. A part Enters into cell Loaded into machine Move to buffer if machine is busy Leaves the machine after operation by machine 2 Machine 1 One in number First in activity No waiting for part to enter in machine 1 Machine 2 One in number Second or Third in activity No waiting or waiting for part to enter in machine 2 A Robot Moves a part from position zero to machine 1 Moves a part from machine 1 to machine 2 or to buffer zone if machine 2 is busy Moves a part from buffer zone to machine 2 when machine 2 is ready. A buffer area Stores a part when machine 2 is busy Dont store a part if machine 2 is ready Move a part from buffer area to machine 2 when machine 2 is ready Classes of Entities Permanent entities stay in system ; Machine 1 Machine 2, Robot Temporary entities that move through the system à ¢Ã¢â€š ¬Ã‚ ¦Part, Buffer zone 1.2 The Activity Cycle Diagram for each of the entities. Part Part Leave Machine 2 Machine 2 Machine 1 Enter into Machine 1 If machine 2 is busy Buffer zone When Machine 2 is ready Figure 1 The Part Part Machine 2 Machine 1 Accepts part Move part to machine 2 If machine 2 is ready Move part to buffer zone if machine 2 is busy Buffer zone Figure 2 Machine 1 Buffer zone Machine 2 Machine 1 Accepts a part from machine 1 Send Part out of When Machine 2 is ready machine 2 Part Final Position If machine 2 is busy Accepts a part from buffer When Machine 2 become ready Figure 3 Machine 2 Machine 2 Part Position zero Machine 1 Moves part Moves part from machine 1 Moves part out of machine 2 From position to machine 2 Part Final Position Zero to machine 1 If machine 2 is busy Moves part from machine 1 to buffer zone When Machine 2 is ready Moves part from buffer zone to machine 2 Buffer zone Figure 4 A Robot Machine 1 Machine 2 Receives part from machine 1 to buffer zone If machine 2 is busy Send part to machine 2 when Machine 2 is ready Buffer zone Figure 5 A buffer area 1.3 The combined Activity Cycle diagram for the whole system and necessary conventions. Robot 1 Robot 2 Part At final position A Part At Position Zero Machine 2 Machine 1 Robot moves a part from Robot moves a part from machine 1 Robot moves a part out from machine 2 Position zero to machine 1 to machine 2 if machine 2 is ready at final position Robot moves a part from machine 1 Robot moves a part from buffer zone To buffer zone if machine 2 is busy to machine 2 when machine 2 become available Buffer zone Figure 6 Part B The elements of the Activity Cycle Diagram that introduce the parts in the cell. Robots are the elements of ACD that introduce parts into machines. It is assumed that there are two Robots. Robot 1 introduce part into machine one and then it has two choices. It moves part from machine 1 to machine 2 if machine 2 is ready to uptake the part. In case the machine 2 is busy, the Robot 1 moves part from machine 1 to buffer zone which is a waiting area. The Robot two is assumed to work with machine 2. It moves part from buffer area into machine 2 when machine 2 becomes available. After processing in machine 2, the Robot 2 moves part from machine 2 to its final position. It should be noted that some assumptions have been made for the responsibilities of two elements (Robots) provided exact tasks have been provided. Four bullet points of the key aspects of proposed diagram. The conditions on which the particular activities in your diagram will be executed. Each activity in ACD is bound with some condition or conditions. For example, in the activity of moving part from machine 1 to machine 2, the attached condition is availability of the machine 2. The Robot 1 will move part from machine 1 to machine 2 provided machines 2 is available to uptake the part. If the condition changes and machine 2 is busy, then Robot 1 will move part to buffer zone. The other significant activity of ACD is related to moving part from buffer zone to machine 2. It is assumed to be done by Robot 2. The Robot 2 has two choices or it will be dealing with two conditions. In condition one when machine 2 is busy, The Robot 2 will not move part from buffer area to machine 2. In condition 2 when machine 2 has become available, then the Robot 2 will move part from buffer zone to machine 2. In the third significant activity, the Robot 2 will move part from machine 2 to its final stage conditional that machine 2 has finished its job on the part. In short, each activity in an ACD is related to one or more conditions. The main attributes of your entities The ACD represents the activities of a model with its entities by composing their life cycles (Abdul et al 1994). The entity could be a passive state as Queue or an active state as activity (Sawhney et al 1995). The Queue and activity are represented in ACD with specific symbols (Shi et al 1997). In the current example, there are also two entities. One is the actual activity or the active state like moving Part from machine one to machine 2 and other entity is the passive entity like buffer zone which can be said as the queue. Similarly we can look at the total entities in ACD. In current example, entities are machine 1, machine 2, Part, buffer area, robot. The physical realization of the queues in the system The physical activity diagram presents an obvious picture to observe the queues in the system (Zeigler 1987). The physical realisation of the queues in the current example comes from the buffer zone which is used as a queue in the example. The part has to wait in buffer area when machine 2 is not free. Therefore the buffer are presents a realisation of the physical queue. The outcome parameters to be studied by the model built upon activity cycle diagram. Each model is designed to study certain parameters in the model (Halpin 1977). The simulation even not used primarily for the optimization of parameters is helpful in optimizing the model in joint effort with design analysis and mathematical evaluation. In the current study, the potential parameters which can be a focus of the study may be studying of queues at buffer zone level, Rate of feed at machine 1, rate of part flow from machine 1 to machine 2 and the removal rate of part from machine 2. All these parameters are of quite significance. For example any significant delay at queue (at buffer zone), decrease at the feed rate at machine 1 or delay at removal rate of part at machine 2 can disrupt the Cell function or decrease its efficiency. The kind of simulation experiments that would be performed with the model. In the real world experimentation can be expensive and in manufacturing and production system, many resources may be used in experimentation (McCahill et al 1993). The alternative to expensive experimentation is simulation methods and other analytical methods (Nance et al 1988). Especially computer model simulations may be economical and provide a chance of actual system observation without incurring unacceptable and expensive options (Murata 1989). On the other hand, physical models may not provide a real picture especially where a layout of resources requires examination such as productivity flow (Vanegas et al 1993). In complex and multistage problems, it may become complex to conduct real and physical experimentation (Paulson 1978). Some actions and activities are not even possible in real world such as a process like flow line optimisation where blocking of a system is required but practically very hard to follow (Paulson et al 1987). However, simulation is not an optimisation p rocedure and must be supported with other procedures like design analysis and optimisation. Therefore we can use experiments like optimisation, design analysis, computerisation simulation, manual simulation, and mathematical model analysis. In current example, objective of model will be kept in mind. First of all small models will be built for each entity. Model will be built in phases and each phase will be checked if it is working properly. The model will be made in phases as it is shown in individual ACD examples. The final ACD will be built once the individual ACD for each entity are checked. Each ACD if planned on computer model or manually will be debugged and corrected. Conclusion ACD are actually the significant evaluation of the flow chart design but with additional features of being used in production and manufacturing field by simulation process. Software is used in designing, analysis and simulation process. Each ACD has entities, attributes attached with entities and conditions associated with each activity. ACD is developed by designing individual ACD for each activity separately and then analysis them for correction. The whole model ACD is developed by merging individual ACD. The current assignment has provided a chance to understand the process of ACD development and analysis by working from individual ACD to the ACD of whole model. References Abdul Riaz, S., Shi, j. 1994. Automated construction simulation optimization. J Construction Eng and Management. ASCE. 120(2), 374-385. Halpin, D.W.1977. Cyclone. A method for modeling job site processes. J Construction Eng and Management. ASCE. 103(3), 489-499 McCahill, D.F., L.E.Bernold.1993. Resource oriented modeling and simulation in Construction. J Construction Eng and Management. ASCE.119 (3), 590-606. Murata, T.1989. Petri nets. Properties, Analysis and implications. Proceeding of IEEE. 77(4).541-580. Nance, r.e, Overstreet .C.M. 1988. Diagnostic assistance using digraph representations of discrete event simulation model specifications. Transactions of the society for computer simulation. 4(1).33-57. Paulson, B.C.1978. Interactive graphics for simulating construction operations. J. Construction. Div. ASCE. 104(1), 69-76. Paulson, B.C., Chan, W.T., Koo, C.C.1987. Construction Operations simulation by microcomputer. J Construction Eng and Management. ASCE.113 (2), 302-314. Sawhney, A., S.M. AbouRiaz.1995. Simulation based planning method for construction project. J Construction Eng and Management. ASCE. 121(3). 297-303. Shi, J., S.AbouRizk.1997. Resource based modeling for construction simulation. J Construction Eng and Management. Vanegas, J.A., E.B.Bravo., D.W.Halpin.1993. Simulation Technologies for planning heavy construction processes. J Construction Eng and Management. ASCE.119 (2).336-354. Zeigler .B.P. 1987. Hierarchical modular discrete event modeling in an object oriented environment. Simulation. 49(5).219-230.

The Psychodynamic Model of Abnormality Essay -- Papers Psychology

The Psychodynamic Model of Abnormality The psychodynamic model of abnormality is useful to an extent. However it has many weaknesses. The psychodynamic model of abnormality was initiated by Sigmund Freud. Sigmund Freud was very interested in hysteria. This is the manifestation of physical causes. He became convinced that unconscious mental causes were responsible not just abnormality but also normality. Freud developed Psychoanalysis. This is a set of techniques for treating the unconscious causes of mental disorders and built up a psychoanalytic theory of how human personality and abnormality develop from childhood. His psychoanalytic approach had a great impact on psychology and psychiatry and was developed by other psychodynamic theorists. Psychoanalysis had a very fixed set of assumptions. One of these is the unconscious processes where many important influences on behaviour come from a part of the mind we have no awareness of called the unconscious. Another assumption is psychodynamic conflict. Different parts of the mind are in constant struggle with each other and the consequences of this are important in understanding behaviour. Freud also believed that behaviour is motivated by sexual and aggressive drives. The drives create psychic energy that builds up and create tension and anxiety if it cannot be released. Another assumption is development where personality is shaped by relationships, experiences and conflict, particularly during childhood. Freud’s psychoanalysis is probably the most important psychodynamic theory. His ideas developed a... ...century. It has had a significant effect on a wide range of disciplines such as anthropology, women’s studies and theology. Also, the sharp distinction between abnormality and normality of the biological model is ignored. Doing this, it has created more sympathy for people with psychological disorders. Psychoanalysis is more humane with its focus on talking as opposed to drugs, shock therapy or brain surgery. It also has the power to enhance our understanding of ourselves and from the number of people who testify how it has helped them in their own lives. In conclusion, the psychodynamic model is useful as it is still being used today by professional psychiatrists and works with many people. However, there are a lot of weaknesses to outweigh the positives, which means that the model can be seriously questioned.

Industrial Economic Research Paper

Qustion1 Identify and explain the market structure in which the company is operating Pos Malaysia Market structure * Monopoly firm Introduction (Pos Malaysia) Pos Malaysia Berhad is Malaysia’s premier physical communications provider. Pos Malaysia also has a widespread network of 701 post offices all over the country, in addition to its network of mini post offices, mobile post offices, postal agents and stamp agents, making it one of the most extensive retail networks in Malaysia.Pos Malaysia’s Strategic Business Units that aim to provide quality, reliable, timely and innovative solutions to its customers, are made up of PosMel (mail and postal services), PosLaju (courier and express mail services), and PosNiaga (retail business services). Pos Malaysia also acts as a counter collection and payment agency for a range of financial transactions, such as bill payments, remittance, insurance and unit trusts. Pos Malaysia consists of 3 Main Core Business Units: Pos Mel ,Pos Laju and Pos Niaga. Poslaju or EMS service caters to all segments of the business community and the general public.There are 37 Poslaju Centres nationwide offer all types of courier services. Besides Mail and Express servicer. Poslaju or EMS service caters to all segments of the business community and the general public. Type of courier services Inbound Logistics * Customs Clearance, Import permit documentation, Transportation, Warehousing, Distribution channel/break bulk, Proof of delivery, Track and trace. Outbound Logistics * Customs clearance ,Export documentation ,Transportations ,Warehousing ,Distribution channel/break bulk ,Proof of delivery ,Track and trace Monopoly market structure (Pos Malaysia)Government protection Pos Malaysia Berhad is a Malaysian postal service company that was privatized in 1992 from a government department into a business corporation. Government also protects and helps pos Malaysia if that firm has shortage cost and losses. was attributed to the pos Malaysia is the first company established to provide these services and the company has long operated, known by society and high cost in the provision of post Malaysia. Society loyalty The society in Malaysia has known about brand of pos Malaysia and the society also has familiar to uses pos Malaysia as services of mail.The public will be more confident in such a service as Pos Malaysia is an agency under the ministry and the government is indirectly involved in ensuring the security of the items kept here. Maximize profit A monopoly market exists when there is huge number of buyers but small or very limited number of sellers in the market. Monopoly is the only supplier of a product for which there is no close substitute. In monopoly market, the firm has get a maximize profit, if the manager has have good skill and knowledge to manages that company.For example, pos Malaysia have a good manages, and that means this company can get a height profit. In monopoly market, pos Malaysia can set its own price and the prices chosen affects the quantity it sells. Pos Malaysia is the only licensed mail services provider in Malaysia and is the leader in the Malaysia Courier Services. Pos Malaysia posted a net profit of RM 61 million for the nine months ended September 2004 – an increase of more than 40 per cent from the corresponding period in the previous year.It is projected to earn a net profit of close to RM100 million this year based on existing postal rates. Power of set prices In monopoly market, pos Malaysia can put the price of the service with a high rate to the profit of the community to obtain greater. This can be carried out in the market as pos Malaysia is the only domestic postal mail offered in Malaysia Advantages in monopoly Stability of prices * In a monopoly market the prices are most of the times stable. This happens because there is only one firm involved in the market that sets the prices if and when it feels like.In other types of market struc tures prices are not stable and tend to be elastic as a result of the competition that exists but this isn’t the case in a monopoly market as there is little or no competition at all. Source of revenue for the government * The government gets revenue in form of taxation from monopoly firms. Massive profits * Due to the absence of competitors which leads to high number of sales monopoly firms tend to receive super profits from their operations.The massive profits realized may be used in such things as launching other products, carrying out research and development among many other things that may be beneficial to the firm. Question 2 Comment if there are barriers to entry Definition Barriers to entry are designed to block potential entrants from entering a market profitably. They seek to protect the monopoly power of existing (incumbent) firms in an industry and therefore maintain supernormal (monopoly) profits in the long run.Barriers to entry have the effect of making a mark et less contestable. Defined an entry barrier as â€Å"A cost of producing (at some or every rate of output) which must be borne by a firm which seeks to enter an industry but is not borne by firms already in the industry. Barriers to entry in( pos Malaysia). In pos Malaysia, there are barriers to entry. Among them are: Advertising and marketing * Developing consumer loyalty by establishing branded products can make successful entry into the market by new firms much more expensive. Cost Advantages Lower Costs; through experience of Being in the market for missing time, allows the existing postal company Malaysia’s to cut price and win price wars if another firm enter the market. Absolute cost advantages * Allows an incumbent firm to earn excess profits without feat of new firm entering the market. for example in the market, pos Malaysia price of the service is able to offer a cheaper service player medals RM7 per unit, but other companies likes DHL and FedEx only able to off er prices as low as RM 12 mail service. so its pos Malaysia cans set PRICES at rm10.Which is are more chipper, than the more customer use pos Malaysia services and also get a highest profit. Government Restrictions * Government is the source of barriers to entry that are created by patents and copyrights. But these are not the only barriers to entry enabled by government. Government is, after all, the entity that establishes the rules of the game. Governments frequently erect barriers to entry by legally limiting the number of participants in a market. Legal restrictions for public utilities are usually designed to make the most effective use of natural monopoly markets that can create serious inefficiency problems.Other legal restrictions, such as licenses or charters, are generally intended to pursue other goals, but create barriers to entry nonetheless. For example, pos mel only provided by pos Malaysia. Although there are big rivals like FedEx and DHL outside, but pos Malaysia o ffer cheaper prices. First mover advantages * The first firm to enter incurs lower marketing costs because it faces no rivals. Later firm face higher marketing costs because they must compete against the first firm. If the presence of the incumbent raises the marketing costs of the second firm to enter, then the first firm has permanent advantages and can maintain high prices

Funny Fathers Day Quotes to Make Dad Smile

Funny Father's Day Quotes to Make Dad Smile We celebrate Fathers Day to honor our fathers. Laughter is an excellent gift. Get your father to laugh with one of these chuckle-worthy funny Fathers Day quotes: Bob Monkhouse My father only hit me once - but he used a Volvo. Robert Orben Life was a lot simpler when what we honored was father and mother rather than all major credit cards. Ann Richards I have always had the feeling I could do anything, and my dad told me I could. I was in college before I found out he might be wrong. Jay Leno A lot of controversy over this possible invasion of Iraq. In fact, Nelson Mandela was so upset, he called Bushs dad. How embarrassing, when world leaders start calling your father. Barbara Kingsolver It kills you to see them grow up. But I guess it would kill you quicker if they didnt. Jimmy Piersall Spread the diaper in the position of the diamond with you at bat. Then, fold second base down to home and set the baby on the pitchers mound. Put first base and third together, bring up home plate and pin the three together. Of course, in case of rain, you gotta call the game and start all over again. Bertrand Russell The place of the father in the modern suburban family is a very small one, particularly if he plays golf. Brad Pitt Man, if I can get a burp out of that little thing I feel such a sense of accomplishment. Ernest Hemingway To be a successful father theres one absolute rule: when you have a kid, dont look at it for the first two years. Gabriel Garcia Marquez A man knows when he is growing old because he begins to look like his father. Tim Russert The older I get, the smarter my father seems to get. Mark Twain When I was a boy of fourteen, my father was so ignorant I could hardly stand to have the old man around. But when I got to be twenty-one, I was astonished at how much the old man had learned in seven years. Bill Hicks I never got along with my dad. Kids used to come up to me and say, My dad can beat up your dad. Id say, Yeah? When? Jack Handy Dad always thought laughter was the best medicine, which I guess is why several of us died of tuberculosis. Alice Roosevelt Longworth My father always wanted to be the corpse at every funeral, the bride at every wedding, and the baby at every christening. Donald Trump I love producing children. Its fun! I dont like taking care of children, but I love producing children. Jerry Seinfeld There is no such thing as fun for the whole family. Patrick Dempsey Heres the cycle: They wake up, they cry, they go to the breast, they eat, they poo or pee, you change a diaper, and they go back to sleep. Its much harder for my wife than for me because shes pumping or nursing. Lionel Richie Forget about surviving 40 years in the music business. Just surviving 27 years of Nicole Richie has been a struggle-and-a-half, I want to tell you. I stand here as a survivor, I want you to know, for all the parents out there. Chris Martin Men should always change diapers. Its a very rewarding experience. Its mentally cleansing. Its like washing dishes, but imagine if the dishes were your kids, so you really love the dishes. Bill Cosby My father confused me. From the ages of one to seven, I thought my name was Jesus Christ!