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|G.Tholkappia Arasu1, S. Mathankumar 2, A.Nagappan 3
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Agent can be defined as a component that, given a goal could act in the place of a user within its domain knowledge. Agents are also called intelligent agents, as intelligence is a key component of agency. Agent oriented approach can be viewed as next step of Object Oriented approach. The project work attempts to demonstrate the concept of developing Multi-Agent platform for processing of Bio-Images and signals. It also demonstrates the concept of developing and deploying agents using JADE – Java Agent DEvelopment framework. The technical goal of this work is to develop a multi agent platform for processing of bio-images and signals aiming at assisting medical practitioners in developing standard examination procedures. If a medical practitioner wants to have an expert opinion about mammogram images and EEG / ECG / EMG of his patient, Generic Agent can be invoked to which he has to specify the SSN (Social Security Number) of the patient, the type of the image and signal and the corresponding data file. The Generic Agent in turn will search for the Specific Agent – Breast image Agent , EEG Agent, ECG Agent, EMG Agent based on the image and signal type on the network and if found, the corresponding information will be passed to the specific agent by the Generic Agent. The result is being sent to the Generic Agent and it stores / updates the result in the Database using the Java Data Base Connectivity. As the agents on the JADE environment run on Threads, the response time is very less which helps the medical practitioner to make a quick diagnosis of mammogram images and signals
|Social Security Number, Breast Image Agent, Signal Agent, Java Agent DEvelopment framework|
|Agent can be defined as a component that, given a goal could act in the place of a user within its domain knowledge. Agents are also called intelligent agents, as intelligence is a key component of agency. Agent oriented approach can be viewed as next step of Object Oriented approach. This work attempts to demonstrate the concept of developing Multi- Agent platform for processing of Bio-images using Digital Processing Techniques. It also demonstrates the concept of developing agents using JADE – Java Agent Development framework.|
|The design phase specifically focuses on the JADE platform, and the concepts provided by it. JADE is the abbreviation for the Java Agent Development Framework and has been developed by the Telecom Italia Lab (TILAB) in Italy, in compliance with the FIPA (Foundation for Intelligent Physical Agents) specifications . FIPA is a non-profit organization geared at producing standards for the interoperation of heterogeneous agents. Essentially, JADE is a middle-ware (written entirely in the Java language, using several Java technologies), which simplifies the implementation of multi-agent systems by providing a set of graphical tools that support the debugging and deployment phases. The agent platform can be distributed across multiple machines, regardless of the underlying operating system, and the configuration controlled via a remote graphical user interface.|
II. METHODOLOGY OVERVIEW
|A methodology serves as a guide for the system designer when developing a system. In general, a software development methodology is comprising of:|
|ï· A process, i.e. a sequence of phases and steps that guide the developer in building the system.|
|ï· A set of heuristic rules that support the developer in making relevant choices.|
|ï· A number of artifacts, i.e. diagrams, schemas or documents representing in graphical or textual form one or more models of the system.|
|ï· A suitable notation to be used in the artifacts.|
|ï· A set of patterns that can be applied to solve common situations.|
|The focus of the work is on the process and the artifacts that are produced and illustrating them. A draft notation is also introduced to be used in constructing these artifacts and, where relevant, some heuristic rules and design patterns are presented. The described process covers the analysis phase and the design phase and is shown in Figure 2.1.|
|The analysis phase is general in nature and independent of the adopted platform. Conversely, the design phase specifically assumes JADE as the implementation platform and focuses directly on the classes and concepts provided by JADE. Observing Figure 2.1, it can be seen that there is strict boundary between the analysis and design phases. Moreover, the methodology is of an iterative nature, thus allowing to move back and forth between the analysis and design phases and the steps therein. At the end of the design phase, i t i s able to progress straight to the implementation, which is where the actual coding occurs. For the sake of the progress, a question is included (see Figure 1), which initially asks whether to use an agent-based solution or not. If the answer is yes, the analysis phase will be started, while if the answer is no, seek an alternative solution. As mentioned in the Introduction, the decision on whether to adopt an agent-based solution is one which should be made only after consulting the literature, and, if possible, analyzing their problem with respect to some guidelines (such as in ). After observing problem domains and cases where an agent-based solution has been implemented effectively, it has been decided to go for Agent oriented Programming for setting up Platform for Processing EEG / ECG / EMG Waveforms.|
|In the methodology adopted, some assumptions have been made. These include:|
|ï· The definition of an agent defined in Section 2.1 is assumed.|
|ï· The JADE platform is the platform of choice for implementation.|
|ï· There are a relatively small number of agents (less than 10).|
|ï· The organizat ional structure of system is static, meaning that non-emergent behaviour at runtime is not expected, and thus, not considered.|
|ï· Security is not a concern.|
2.2. The Agent based Bio-Image and signal Processing Scenario
|The proposed work attempts to demonstrate the concept of developing Multi-Agent platform for processing of Bio- Images and signals. It also demonstrates the concept of developing agents using JADE – Java Agent DEvelopment framework. The agents are trained, intelligent system that is capable of setting up the platform for processing the EEG / ECG / EMG waveforms. The agents themselves communicate with each other in decision making process. The technical goal of this work is to develop a multi agent platform for processing of bio-Images and signals aiming at assisting medical practitioners in developing standard examination procedures.|
|If a medical practitioner wants to have an expert opinion about Mammogram Images, EEG / ECG / EMG of his patient, Generic Agent can be invoked to which he has to specify the SSN (Social Security Number) of the patient, the type of the signal and the corresponding data file. The Generic Agent in turn will search for the Specific Agent – Breast Image Agent, EEG Agent, ECG Agent, EMG Agent based on the signal type on the network and if found, the corresponding information will be passed to the specific agent by the Generic Agent. For example the EMG medical practitioner wishes to have an expert opinion, the EMG Agent with all necessary information, will look for an EMG Expert System (HINT, DARE, CANDID, MIYOSYS-II). Getting the Expert knowledge, the interpretation will be sent back to the Generic Agent through EMG Agent. The expert opinion will be displayed on the user side as well as it will be stored in Database by DB Agent for further references.|
III. ANALYSIS AND DESIGN
|The analysis phase aims to clarify the problem without any (or minimal) concerns about the solution.|
3.1 STEP 1: Use Cases
|Use cases are an effective way to capture the potential functional requirements of a new system. Each use case presents one or more scenarios that demonstrate how the system should interact with the end user or another system to achieve a specific goal. There are a number of standards for representing use cases. The most popular is the Unified Modeling Language (UML) specification , which defines a graphical notation. Though use cases are used extensively by object-oriented practitioners, their applicability is not restricted to object oriented systems, because they are not object orientated in nature . Hence, it is also possible to apply use cases (without modification) to capture the functional requirements of multi-agent systems. Accordingly, the use cases a r e defined, and a use case diagram produced as shown in Figure 3.1.|
3.2 Step 2: Initial Agent Types Identification
|This step involves identification of the main agent types and subsequent formation of a first draft of the agent diagram. The following rules have been adopted in this step:|
|ï· Add one type of agent per user/device.|
|ï· Add one type of agent per resource (which includes legacy software).|
|By applying the above rules to the Multi-Agent System development, the initial diagram shown in Figure 3.1 is obtained. The agent diagram is one of the main artifacts produced in the analysis phase and is progressively refined from Steps 2 to 5. With reference to Figure 3.1, the agent diagram includes four types of elements:|
|1. Agent types: the actual agent types, represented by circles.|
|2. Humans: people that must interact with the system under development, represented by the UML actor symbol.|
|3. Resources: external systems that must interact with the system under development, represented by rectangles.|
|4. Acquaintances: represented by an arrow linking instances of the above elements, specifying that the linked elements will interact in some way while the system is in operation. Note that, at this stage, only acquaintances between agents and resources / humans are shown in the agent diagram (i.e. agent-agent interactions are deferred to a later step). In the agent diagram produced in this step (see Figure 3.2), the agents are acting as transducers, i.e. as an interface between the external/legacy systems/people, and the other agents in the system.|
3.3 Step 3: Responsibilities Identification
|In this step, for each identified agent type, an initial list is made of its main responsibilities in an informal and intuitive way. The artifact resulting from this process is the responsibility table.|
|The following rules have been adopted in this step:|
|ï· Derive the initial set of responsibilities from the use cases identified in Step 1.|
|ï· Consider the agents where these responsibilities are clearer first and delay the identification of responsibilities for other agents to later steps.|
|By applying the above rules to the Multi-Agent System Development, the consideration of the Generic agent is initiated and Table 1 is produced.|
3.4 Step 4: Acquaintances Identification
|In this step, the focus is on who needs to interact with whom and the agent diagram (Figure 3.1) is updated by adding proper acquaintance relations connecting agents that need to have one or more interactions. The term acquaintance comes from Gaia , and is used in the same sense in the proposed system.|
|An obvious acquaintance relation in the multi-agent system is required between different agents: the user and the provider. Then, since a Generic agent must present the detailed report to its user and this information is stored in the database and made available by the relevant provider agents, there will certainly be an acquaintance relation between the Gener ic agent and the DB agent. Thus, going one step backward (to Step 3, Section 3.3), some new responsibilities can be added to the Gene r i c agent and the DB agent and presented in Table 3.4.|
3.5 Step 5: Agent Refinement
|In this step, the set of agent types initially identified in Step 2 (see Section 3.2) are refined by applying a number of considerations. These are related to:|
|ï· Support: what supporting information agents need to accomplish their responsibilities, and how, when and where is this information generated/stored.|
|ï· Discovery: how agents linked by an acquaintance relation discover each other.|
|ï· Management and monitoring: is the system required to keep track of existing agents, or the starting and stopping of agents on demand.|
|These considerations are highly dependent on the domain, and hence, it is quite difficult to provide generic indications. Once the Generic Agent is fed with the required details, it in turn searches for the specific agent to pass the required messages. If the specific agent is ready the processing of the signal will be initiated. The refined responsibilities table is presented in Table 3.5.3.|
|In the simplest case, agent discovery can be accomplished by means of proper naming conventions. For example, in the proposed system the processing agents are named after the type of signal it processes – EEG Agent, ECG Agent, EMG Agent.|
|Adopting naming conventions is very simple and efficient, but has some limitations:|
|ï· Agent names must be globally unique.|
|ï· Agents which are going to be involved in an interaction must typically be known in advance. This works well provided that it is known in advance that there is one, and only one, such agent.|
|ï· Assuming naming conventions is typically not very extensible.|
|Naming conventions may lead to additional work when applied to an agent that can appear and disappear dynamically. The reason being that a naming convention does not provide any presence information, and therefore, addressed agents may not be available when an attempt is made to contact them.|
|Naming conventions cannot be adopted when different users may start their own agents and choose names themselves. In such cases, there is no guarantee that name uniqueness is preserved.|
3.5.3 Management and Monitoring
|Other agent types can be added to address issues such as monitoring agent faults and restoring them, creation of supporting agents that are needed only under certain conditions, or providing presence information. Having refined the set of agent types, the process is to go back to Steps 2, 3, and 4(Sections 3.2, 3.3, and 3.4, respectively), and iterate until sufficiently detailed descriptions of the agent types, their responsibilities, and acquaintance relations, respectively, are reached. On doing this, with respect to the multi-agent system, the artifacts shown in Figure 3.5.3 and Table 3.5.3 are obtained.|
3.6 Step 6: Agent Deployment Information
|Another artifact that can be useful to produce is the agent deployment diagram, where the physical hosts/devices agents are going to be deployed are indicated. The agent deployment diagram for the multi-agent system is shown in Figure 6. It should be noted that this diagram is not intended to give any detailed information about deployment (in contrast to the UML deployment diagram, where details such as the communication modes between nodes are given). The sole purpose of the agent deployment diagram is to highlight basic deployment requirements that are referred to during design when applying considerations such as agent splitting and merging (Section 4.1) or when considering communication efficiency.|
|Once the problem has been clarified to a sufficient level of detail, a move is made from the analysis to the design phase, which aims to specify the solution. There is not a strong boundary between these two phases, and while iterating on the analysis or design, one can move between the two (see Figure 1). Since from this point on, the proposed methodology focuses on the JADE platform (and hence., the constructs provided by it). Carrying out the design phase allows to reach a level of detail that is sufficient enough to have a relatively straightforward transition to the implementation, with the possibility of a significant amount of code being generated. Similar to the analysis, the design phase has been carried out by following a number of logical steps, with a certain degree of overlap. The steps in the design phase are discussed in detail as shown in the figure|
3.7.1Internal Agent Behaviours
|The actual job an agent has to do is typically carried out within the agent’s “behaviour(s)”. Hence, in this step, the agent responsibilities are looked up (via the responsibility table) identified in the analysis phase and maped them to agent behaviours. First of all, the following rule has been applied: For a responsibility related to an interaction in the interaction table described in Step 2 of the design phase (Section 4.2), obtain the JADE class implementing the interaction protocol and role selected for that interaction and provide a suitable extension. The responsibilities have been implemented using completely application-specific behaviours. These classes include:|
|ï· OneShotBehaviour: implementing an atomic task that runs once and terminates immediately.|
|ï· CyclicBehaviour: implementing a task that is always active, and performs the same operations each time it is scheduled.|
|ï· TickerBehaviour: implementing a task that periodically executes the same operations.|
|ï· WakerBehaviour: implementing an atomic task that runs once after a certain amount of time, and then terminates.|
|The State Transition Diagram in Figure 3.7.1 demonstrates that for the responsibilities defined in the analysis phase, there may be many “sub-responsibilities” (unanticipated responsibilities arising from the main responsibilities in the responsibility table) when mapping to agent behaviours (leading to an update of the responsibility table).|
IV. DEPLOYMENT AND TESTING
|After completing the steps of analysis and design, the features of JADE platform have been explored for the implementation of multi-agent system. With reference to the design phase, the following agents have been developed using Java language: Generic Agent, DB Agent, Breast Image Agent, EEG Agent, ECG Agent and EMG Agent. The required behaviors and actions were implemented as per the design guidelines and FIPA recommendations. The required table has been created in Database which is accessible through Java DataBase Connectivity (JDBC). Unit Test has been performed for each agent that has been developed. The agents were also tested on various machines. After successful completion of Unit Test, the agents were deployed on the designated systems in order to perform System Testing. Different inputs were tried to make that the agents are performing their tasks as required. The complete Testing process has been carried out after deploying the agents on JADE Platform. At the time of deployment the naming conventions as per the FIPA recommendations has been strictly adhered.|
V. CONCLUSIONS AND FUTURE WORK
|The JADE platform is a popular, FIPA-compliant platform for the development of multi-agent systems. However, prior to this, no formal work on bio-images and signal processing had been proposed for the analysis and design of multi-agent systems using the JADE platform. The multi-agent system for processing Bio-Images and signals will help the medical practitioners to have a standard examination procedure. It also helps the medical practitioner to interact with the expert in the field his need in order to make a proper judgment in the diagnosis phase. As the agents on the JADE environment run on Threads, the response time is very less which helps the medical practitioner to make a quick diagnosis of mammogram images and signals. The breast cancer images are classified using of Computer Aided System and the results will be analyzed.|
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