Dynamic Object Model and Adaptive Workflow †Computer Science Essay

Dynamic Object Model and Adaptive Workflow – Computer Science Essay Free Online Research Papers Dynamic Object Model and Adaptive Workflow Computer Science Essay 1 Introduction: Hammer and Champy identify three factors that characterize modern businesses: customers take charge, intense competition, and constant change.Also scientists and engineers require flexible models for process definition and execution. The outcomes of scientific processes evolve as the experiment unfolds. It is difficult to determine in advance the structure of the entire process. Scientific workflow systems must allow workflows and product data to evolve at runtime. 2 Dynamic Object Models for Changing Environments Dynamic Object Model (DOM) architecture stores its object model in configuration data and interprets it at runtime. Changing the object model will immediately result in a change in behavior. Since the object model is represented as data, it is usually easy to change. DOMs strive to represent knowledge about a domain as relationships between the objects that model the domain. They avoid hard-coding this knowledge into the code, since usually code can’t change at runtime. DOMs usually emerge from mature domain-specific frameworks. As developers evolve a framework from white-box to black-box [RJ97], they gain a better understanding of the domain. This enables them to recognize the â€Å"hot spots† of the design- the parts that are likely to change. Next, developers factor out these parts into configuration data. What’s left is a generic system that interprets the configuration data at runtime. Changing the behavior doesn’t require code changes any longer. This approach yields a dynamically modifiable system, where the data contains the configuration information. Users can modify the system without programming and can defer configuration decisions until runtime. When you let users modify the system, you also have to deal with their mistakes. For this reason, DOM applications require user support tools. The DOM architectural style has been successful in domains where the business rules change often. For example, automobile makers release new models every year. Manufacturing can benefit from DOM, but the benefit might not be worth the cost. 3 The Structure of the Dynamic Object Model Design patterns; Type Object [JW97], most important, which separates an Entity from an EntityType. Entities have Properties and Type Object is used a second time to separate Property from PropertyType. Strategy objects [GHJV95] define the behavior of an EntityType. Metadata [FY98] supplies the mechanism that allows the architecture to represent the knowledge about the domain as configuration information. Visual Builder [RJ97] provides a means for the now-empowered users to interact with the object model. 3.1 Properties Objects encapsulate state and behavior. State corresponds to attributes which are usually implemented with instance variables. Changing the instance variables of an object requires changing its code. Instead of having an instance variable for each attribute, the Property pattern uses an instance variable that holds a collection of attributes. Each attribute is associated with a unique key. Users use these keys to access, alter, modify or remove attributes at runtime. Users can add the extra attribute at runtime, without stopping the system. 3.2 Strategy In an object-oriented programming language, methods or virtual functions define the behavior of objects. The most languages do not allow objects to control their own methods. We want to be able to control an object’s behavior. We need to represent behavior with a user-level mechanism. A Strategy is the reification of behavior into objects. The Strategy pattern defines a standard interface for a family of algorithms. Clients can work with any algorithm of a given family. If an object’s behavior is defined by one or more strategies then that behavior is easy to change. 3.3 Type object The majority of object-oriented languages structure a program as a set of classes. A class defines the structure and behavior of objects. Most object-oriented systems use a separate class for each kind of object. Introducing a new kind of object requires making a new class, which requires programming. The Type Object pattern makes the class-instance classification relationship explicit. Some languages permit the class of an object to change (e.g., Smalltalk), but most do not. With Type Object, the classification relationship is at the user level and can be dynamically modified. Of course, simply changing the process type is not enough- we also need to convert the attributes. However, now the user controls the state, behavior, and classification relationship. 3.4 Metadata DOMs represent the reminder of the object model as configuration data, or Metadata. Therefore, modifications of the configuration data change the object model. In turn, changing the object model alters the system behavior. Two factors contribute to the extended flexibility of DOM architectures. the generic part is hardwired; types, entities, attributes and algorithms are universal concepts the variable part is pushed into Metadata; users have full control and modify it to adapt the object model to their needs 3.5 Visual builder One of the main reasons to build a DOM is to extend the system without programming. Users have direct access to the object model. They control the relationships between its core components and the Metadata information. DOM architectures push complexity into the configuration data and delegate configuration decisions to the users. 4 An Object-OrientedWorkflow Model The typical workflow system architecture consists of three components [Hol95, AAAM97, Sch96]. Build-time functions provide support for process definition and modeling. Run-time control manage process execution and their associated resources. Finally, run-time interaction functions provide the interfaces to human users and IT application tools. Usually, a workflow engine integrates both run-time control and interaction functions. The workflow engine handles process enactment. This consists of reading process definitions; creating new process instances; and scheduling the various steps within the process and the appropriate resources. For adaptive workflow, we should be able to change the process definition while the process is running. We should also have a way to change a particular process instance. We look at workflow through the lens of object-oriented technology. Since we are familiar with DOMs in the context of flexible object-oriented systems, we’d like to use the same architectural style and techniques for adaptive workflow and modifiable process models. Creating process instances from a process definition is similar to creating instances of a class. We usually employ the Composite design pattern to implement tree structures. For adaptive workflow we want to be able to dynamically change the type of a procedure. The catalog form of the Composite pattern [GHJV95] uses separate classes for node and leaf elements. To provide maximum runtime flexibility, we don’t want to commit a procedure type to a particular class. Therefore, we employ a variant that doesn’t use a classification relationship. Leaves can now change into composites and vice versa. 6 Dynamic Object Model and Workflow Adaptation First, we need a workflowmodel that supports evolution as well as ad-hoc modifications of process instances. Model evolution is essential for Business Process Reengineering (BPR) and Continuous Process Improvement (CPI). Ad-hoc modifications allow users to adjust a particular process instance to specific circumstances. Second, we need a flexible infrastructure. The underlying software systems must be able to keep up with the process changes. We proceed from the highest to the lowest level of abstraction. We also look at an additional characteristic supporting adaptive workflow, namely the convergence of build-time and run-time environments. 6.1 Domain level adaptation Software has two dimensions: Application domain and contains domain-specific logic Control and data flow (i.e. workflow) and is domain independent Generally we use the same tool (usually a programming language) in both dimensions. This characteristic encourages beginners to combine the two dimensions. Consequently, domain-specific code and control logic are usually intertwined within applications. Inexperienced programmers see (and think in) a unidimensional problem space. In contrast, workflow is a tool only for the control and data flow dimension. We can change on either dimension with minimal consequences for the other. To facilitate domain level adaptation, application and workflow-specific processing should be loosely coupled. However, only experienced architects achieve a good separation. The procedure framework tries to maintain a reduced contact area between the application and workflow domains. Control crosses the domain boundary only from the instance side in the workflow domain, at the level of Procedure objects- see Figure 6. The Iterative procedure type helps us to keep the application domain unspoiled from control logic. This reduced coupling means that changing the domain objects has a low impact on procedures, and vice versa. 6.2 Process level adaptation The workflow framework abstracts control flow in procedures. Type Object pattern in object-oriented design separates the issues of workflow evolution and those of dynamic ad-hoc changes: process owners can modify the ProcedureType, in the knowledge level. This structural change affects all Procedure objects of the corresponding type process users can change the Procedure instance, in the operational level. These changes have local scope and don’t affect other users The flexible composition supports process evolution as well as ad-hoc modifications. The key observation here is that the ProcedureType instantiates the Procedure at runtime, a dynamic binding between a process and various potential implementations. In other words, we don’t need the complete process specification at build time. A procedure can complete its specification at runtime. Alternatively, the workflow system may ask the For adaptive workflow we need adaptive exception handlers. At the framework level, we can implement exception handlers as procedure types. Users change the handlers in the same way they change process definitions. 6.3 Resource level adaptation In an adaptive workflow system resources are dynamic. 6.4 Infrastructure The hospital may decide to replace the relational database used for persistence with an object-oriented database. 6.5 Build-time and run-time environments We need an integrated environment for adaptive workflow. Ouksel and Watson investigate the capabilities needed by workflow systems to accommodate adaptive workflow [OJW98]. They identify the integration of build-time and run-time environments as an important requirement. Chiu and Li [CKL98] also recognize the importance of an integrated environment for workflow evolution. The build-time environment enables them to create new procedure types, in the knowledge level. For instance, a new treatment for a disease may be discovered. Likewise, the run-time environment handles procedure execution. Physicians customize a particular running process (procedure instance) according to their needs. Smalltalk, a powerful object-oriented language, has one of the best programming environments. The development environment is fully integrated with the run-time. A user can interrupt a running program, change the code and resume execution. Research Papers on Dynamic Object Model and Adaptive Workflow - Computer Science EssayIncorporating Risk and Uncertainty Factor in CapitalOpen Architechture a white paperBionic Assembly System: A New Concept of SelfResearch Process Part OneThe Project Managment Office SystemAnalysis of Ebay Expanding into AsiaGenetic EngineeringThree Concepts of PsychodynamicPETSTEL analysis of IndiaThe Relationship Between Delinquency and Drug Use

Major Themes in Much Ado About Nothing

Major Themes in Much Ado About Nothing Shakespeare’s treatment of love in ​Much Ado About Nothing​ differs from his other romantic comedies. Sure, it shares the same​ stagy plot, which finishes with the lovers finally getting together, but Shakespeare also mocks the conventions of courtly love that were popular at the time. Although Claudio and Hero’s marriage is central to the plot, their love at first sight–type of relationship is the least interesting one in the play. Instead, the audiences attention is drawn to Benedick and Beatrice’s unromantic backbiting. This relationship seems more believable and enduring because they are painted as a match of intellectual equals and dont fall in love with each other based on superficiality. By contrasting these two different types of love, Shakespeare manages to poke fun at the conventions of courtly, romantic love. Claudio uses highly contrived language when speaking of love, which is undermined by Benedick and Beatrice’s banter: â€Å"Can the world buy such a jewel?† says Claudio of Hero. â€Å"My dear Lady Disdain! Are you yet living?† says Benedick of Beatrice. As an audience, we are supposed to share Benedick’s frustration with Claudio’s transparent, pompous rhetoric of love: â€Å"He was wont to speak plain and to the purpose, like an honest man and a soldier...His words are a very fantastical banquet, just so many strange dishes.† DeceptionFor Bad and Good As the title suggests, there is a lot of fuss over very little in the play- after all, if Claudio weren’t so impetuous, Don John’s rather weak plan to ruin Don Pedros reputation and disrupt the marriage of Claudio and Hero wouldn’t have worked at all. What makes the plot so intricate is the use of deception throughout, via trickery, lies, written messages, eavesdropping, and spying. Back when the play was staged, the audience would have understood that title is also a pun on noting, or being observant, even bringing the deception theme into the title. (The words are thought to have been pronounced similarly back then.) The most obvious example of deception is when Don John falsely slanders Hero for his own mischief, which is countered by the friar’s plan to pretend Hero is dead. The manipulation of Hero from both sides renders her a passive character throughout the play. She does very little and becomes an interesting character only through the other character’s deceit.   Perception of Reality Deception is also used as a force for good in the play, as in Beatrice and Benedick’s scenes where they overhear conversations. Here, the device is used to great comic effect and to manipulate the two lovers into accepting each other. The use of deception in their storyline is necessary because it is the only way they could be convinced to allow love into their lives. Phrased another way, the theme could also be called one of perception, or how truth can differ from reality. Both couples have to discover the true nature of their beloved. It is interesting that all of Much Ado’s characters are so willing to be deceived: Claudio doesn’t stop to suspect Don John’s actions, both Benedick and Beatrice are willing to completely change their worldview after overhearing things about each other, and Claudio is willing to marry a complete stranger to appease Leonato. But, then again, it is a lighthearted Shakespearean comedy.

Prehistoric Life During the Miocene Epoch

Prehistoric Life During the Miocene Epoch The Miocene epoch marks the stretch of geologic time when prehistoric life (with some notable exceptions in South America and Australia) substantially resembled the flora and fauna of recent history, due in part to the long-term cooling of the earths climate. The Miocene was the first epoch of the Neogene period (23-2.5 million years ago), followed by the much shorter Pliocene epoch (5-2.6 million years ago); both the Neogene and Miocene are themselves subdivisions of the Cenozoic Era (65 million years ago to the present). Climate and Geography As during the preceding Eocene and Oligocene epochs, the Miocene epoch witnessed a continuing cooling trend in the earths climate, as global weather and temperature conditions approached their modern patterns. All of the continents had long since separated, though the Mediterranean Sea remained dry for millions of years (effectively joining Africa and Eurasia) and South America was still completely cut off from North America. The most significant geographic event of the Miocene epoch was the slow collision of the Indian subcontinent with the underside of Eurasia, causing the gradual formation of the Himalayan mountain range. Terrestrial Life During the Miocene Epoch Mammals. There were a few notable trends in mammalian evolution during the Miocene epoch. The prehistoric horses of North America took advantage of the spread of open grasslands and began to evolve toward their modern form; transitional genera included Hypohippus, Merychippus and Hipparion (oddly enough, Miohippus, the Miocene horse, actually lived during the Oligocene epoch!) At the same time, various animal groups - including prehistoric dogs, camels, and deer - became well-established, to the point that a time traveler to the Miocene epoch, encountering a proto-canine like Tomarctus, would immediately recognize what type of mammal she was dealing with. Perhaps most significantly, from the perspective of modern humans, the Miocene epoch was the golden age of apes and hominids. These prehistoric primates mostly lived in Africa and Eurasia, and included such important transitional genera as Gigantopithecus, Dryopithecus, and Sivapithecus. Unfortunately, apes and hominids (which walked with a more upright posture) were so thick on the ground during the Miocene epoch that paleontologists have yet to sort out their exact evolutionary relationships, both to each other and to modern Homo sapiens. Birds. Some truly enormous flying birds lived during the Miocene epoch, including the South American Argentavis (which had a wingspan of 25 feet and may have weighed as much as 200 pounds); the slightly smaller (only 75 pounds!) Pelagornis, which had a worldwide distribution; and the 50-pound, sea-going Osteodontornis of North America and Eurasia. All of the other modern bird families had pretty much been established by this time, although various genera were a bit larger than you might expect (penguins being the most notable examples). Reptiles. Although snakes, turtles, and lizards continued to diversify, the Miocene epoch was most notable for its gigantic crocodiles, which were nearly as impressive as the plus-sized genera of the Cretaceous period. Among the most important examples were Purussaurus, a South American caiman, Quinkana, an Australian crocodile, and the Indian Rhamphosuchus, which may have weighed as much as two or three tons. Marine Life During the Miocene Epoch Pinnipeds (the mammalian family that includes seals and walruses) first came into prominence at the end of the Oligocene epoch, and prehistoric genera like Potamotherium and Enaliarctos went on to colonize the rivers of the Miocene. Prehistoric whales - including the gigantic, carnivorous sperm whale ancestor Leviathan and the sleek, gray cetacean Cetotherium - could be found in oceans worldwide, alongside enormous prehistoric sharks like the 50-ton Megalodon. The oceans of the Miocene epoch were also home to one of the first identified forebears of modern dolphins, Eurhinodelphis. Plant Life During the Miocene Epoch As mentioned above, grasses continued to run wild during the Miocene epoch, especially in North America, clearing the way for the evolution of fleet-footed horses and deer, as well as more stolid, cud-chewing ruminants. The appearance of new, tougher grasses toward the later Miocene may have been responsible for the sudden disappearance of many megafauna mammals, which were unable to extract sufficient nutrition from their favorite menu item.

Drama- Los Vendidos ( Luis Valdez) Essay Example | Topics and Well Written Essays - 250 words

Drama- Los Vendidos ( Luis Valdez) - Essay Example This oppression entails racial prejudice and inequality faced by Chicanos while trying to achieve their American dream. However, Valdez uses satirical humor to depict these injustices and deliver the message to the audience. A good example of such humor occurs when Sancho responds to a customer’s concerns regarding finding a Mexican with the capacity to work for the government. The play is also impressive as it uses locations such as East of Los Angeles, which is suitable for the historical American setting because Chicanos lived in the region in the 20th century. In addition, Los Vendidos encompasses the use of stereotypes in dialogue to convey the author’s intended message. For instance, the dialogue between Sancho and a customer with regard to the maintenance of the Mexican models is implicit of a stereotype regarding Chicanos’ traditional foods, as well as their conventional work ethic. Los Vendidos’ use of both English and Spanish creates an uneven storyline that requires the audience to find translations to keep up with the story’s

Evidence-Based Practice among Hospital Nurses Term Paper

Evidence-Based Practice among Hospital Nurses - Term Paper Example In this light, the healthcare leader was categorical that the final decision arrived at must be premised on available data and the rightful conviction that the decision made will elicit the most optimal patient outcome. The healthcare leader was also very categorical that the foregoing differentiates EBP from research-based practice (RBP). This is the case since, unlike EBP; RBP is a scientific method which involves the collection and analyzing traditional practices that are sustained within standards of care.   The import of this is that in RBP, the care being advanced towards the patient has to have been identified as the most effective. This identification is normally carried out by comparing available research with and the established methods. The results available are thus to change the delivery of care, upon the changes having been deemed medically appropriate. Also, the changes that are being made must have been proven to have the capacity for improved outcome. During the in teraction with the healthcare leader, it became very palpable that he felt strongly about the topic. The strong conviction that the health care leader harbors are pegged on the belief that evidence-based research study will pave way for more efficient and productive services delivery in a medical institution and the healthcare sector in general. This is mainly because, according to him, an evidence-based research study is likely to herald certain values. Particularly, employing the use of evidence-based research studies in healthcare puts focus on health care and scientific literature. All this consideration of medical and scientific literature is underpinned by the need to improve: treatment modalities such as appropriate medical technology; safety and quality (including prevention of accidents, errors, and infections); and exercises (as a way of encouraging rehabilitation and exertion).

The Ways We Lie Research Paper Example | Topics and Well Written Essays - 1750 words

The Ways We Lie - Research Paper Example ng copywriter, and an author to Companion through the Darkness, in her writing of â€Å"The Ways We Lie,† tries to bring to light the numerous ways in which human beings lie to each other. The lies are justifiable by those who tell while others are not. She argues that every one of us is bound to lie and we do find excuses to get out of it when caught. There are many types of lying, which are to be discussed in this paper, and giving some examples to show how they are told. Ericsson believes that it is practically impossible to live without lying. She even tried doing that herself for a whole week, and she says that it was ‘paralyzing’ and that ‘there must be a merit to lying’. When you lie, it puts an end to the pressing issue or the situation one is in, but others require a series of lies that could go on for a lifetime. If one is not careful, the truth comes out at some point. All they had told becomes null and they get into trouble. The white lie, we are all guilty of this. When we are with our friends, we often lie to them in their faces so that we cannot hurt their feelings (Krentz, 2007). ‘You look okay in the suit’ we tell this to someone getting into an interview room so that they do not panic before they get an interview for their dream job. If we were to tell them the truth at that moment, they may back out from what they were doing and try to concentrate on the not so important details, which may lead them to fail. Men lie to their women almost every morning before they go to work, ‘Honey, your hair is perfect’, yet they have not even given the hair a look at all. Bergen Evans, an English professor said: A man who will not lie to a woman has very little consideration for her feelings. Deflection is another type of lying. It is easily visible in court when you make an accusation against someone and do not have a way to defend themselves. The only option for them is to keep quiet until the other party says something offensive about

Integrated Marketing Communication Essay Example | Topics and Well Written Essays - 2000 words

Integrated Marketing Communication - Essay Example The promotional strategies used by the companies are essential to communicate with the target customers regarding the products that are launched by the company. The study aims at evaluating the importance of salesperson in an organization and also to understand the effectiveness of advertising a product. The research offers a scope to develop a policy in order to remain ethical in the advertising practices of a company. A good salesmanship is necessary for a company to promote its goods and services that have been newly launched and to create awareness among the buyers regarding the invention (Holm, 2006). A good salesmanship involves maintaining a good relationship with the customers so that the customers develop a brand loyalty for the product. The personality of the salesman should be such that they are successful in convincing the customers to purchase the products and also to visit the outlets regularly. The process of advertising facilitates the personal selling and the responsibility of the sales person becomes easier in case the customers have the knowledge regarding the product (Reid, 2005). The personality of the salesman helps in attracting new customers and enhancing the goodwill of the company. A more knowledgeable sale person is an ultimate requirement of the company and it also increases the possibility of bringing success to the company. The type of sales promotion varies based on the products that are launched in the international market. For example, Maruti Suzuki has launched a new model of car that is highly fuel efficient and it would be beneficial for the customers. However, for carrying out the promotional activities, the company has to train the salesperson regarding the features of the new model.