2. Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/1/7
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Item Petri net based verification of a cooperative work flow model(2009) Annappa, B.; Jiju, P.; Chandrasekaran, K.; Shet, K.C.This paper exploits the theory of Petri nets to verify reachability and soundness of a cooperative workflow model. First, we outline a cooperative workflow model, which is a modified version of Bonita workflow model. Bonita is open source cooperative workflow management software which is an ongoing project from object web consortium. Then we describe the cooperative workflow model using a special kind of Petri net called Wf-net. Next we employ WF-net for verification of the model for reachability and soundness properties. The Petri net based verification shows that the model is reachable and sound. �2009 IEEE.Item Meta-level constructs in content personalization of a web application(2010) Annappa, B.; Chandrasekaran, K.; Shet, K.C.In today's business environment, web applications become more and more complex but they still need to be flexible for changes, easy to maintain and the development life cycle need to be short. A reflective technique seems to be the best way to achieve flexibility of the web applications when adding the personalization features like recommendations, special offers, etc. Most of the algorithms help to achieve personalization; but, little attention has been paid to the design and modeling process of internet applications. Personalization will help to cope with increasing complexity of Business Enterprise level Applications. High-level, cleanly layered solutions open up promising possibilities to overcome these difficulties. This paper gives an insight into the content personalization of a web application using meta-level constructs. �2010 IEEE.Item Lightning electromagnetic fields at different heights above the ground(2009) Chandrasekaran, K.; Durai, Kannu, P.This paper presents the computed results of electric and magnetic fields generated by the near by lightning. The electric and magnetic fields have been computed for different heights ranging from 10 m to 2 km above the ground and for the lateral distances varying from 20 m to 2 km from the lightning return stroke. For airborne vehicles e.g, satellite launch vehicles, missiles etc, it has become necessary to understand the behavior of these when illuminated by a strong electromagnetic fields generated by a near by lightning. The coupling of these fields with the above system could be by means of the leakage of the transient electromagnetic fields through the joints of the vehicles, leakage through the improperly shielded cables, leaks through the edges of closed doors etc. This results the generation of transient voltages and currents with the internal circuitry of such systems. The objective of this work is to compute the fields along the airborne vehicles when excited by plane electromagnetic fields. These plane electromagnetic fields consist of electric and magnetic fields, where the fields could get modified at different heights from the ground plane and for different distances from the lightning channel. �2009 IEEE.Item IT service provisioning by passing hints in module interfaces(2012) Naik, N.N.; Veigas, J.P.; Chandrasekaran, K.Communication is a crucial aspect in the domain of IT service provisioning, where data is being transmitted from the sending entity to the receiving entity by the interaction of applications via an interface. When the data is transferred, large amount of time is consumed for its computation by the service at the receiving side. When two applications interact via an interface the communication can be made effective by enhancing the IT service provisioning system with inclusion of web services by some faster means. In this paper we discuss how IT service provisioning can be handled by making use of hints using web services that can be passed by the modules within the application via interfaces from a client to the service, which can avoid expensive computation by the service. The hint is passed in its request and if correct, a service can avoid the computation and communication overhead leading to better system performance. If the message or hint is incorrect it leads to erroneous computations. Passing hints between the modules within an application should take place in an effective, non-erroneous way by imparting quality and less computation by the service involved between two communicating entities contributing towards the promises of services provided by cloud computing. � 2012 IEEE.Item Horizontal component of electric field due to lightning return strokes(2011) Chandrasekaran, K.; Punekar, G.S.Lightning generated horizontal electric field above the ground have been computed and reported for a typical height of 10 m (above the ground plane), at a radial distance of 750 m from the striking point. The results are presented for typical first and subsequent return strokes of lightning involving two cases, (i) perfectly conducting ground (ii) finitely conducting ground (? g=0.0001 S/m). The ground conductivity effects on the horizontal electric field components (static, induction and radiation) are studied. A comparison is made on the basis of computed results with typical first and subsequent strokes. � 2011 IEEE.Item Analyzing design patterns for extensibility(2011) Annappa, B.; Rajendran, R.; Chandrasekaran, K.; Shet, K.C.A system is said to be extensible, if any changes can be made to any of the existing system functionalities and/or addition of new functionalities with minimum impact. To achieve extensibility, it has to be planned properly starting from the initial stage of the application development. Keeping in mind all the possible future changes to be made, the designer should select the proper design patterns and finish the design for the application. Once the application design is finished, it should be analyzed to make sure that the application is extensible. � Springer-Verlag Berlin Heidelberg 2011.Item An agent based peer-to-peer network with thesaurus based searching, and load balancing(2005) Thampi, S.M.; Chandrasekaran, K.This paper describes a search mechanism for files in an unstructured peer-to-peer network. Most of the existing P2P architectures cannot autonomously locate services on the P2P network. Peers can hardly work and cooperate as a team. Using well-designed agents can improve the efficiency of the operations and data communication in the P2P applications. In the proposed system, agents are residing on peers and almost take care of every thing. They receive a problem from the user or other agents, send each job to the responsible agents and merge the sub-solution gathered from them to present a final solution. The communication among nodes takes place through mobile agents. The key features include content matching, parallel downloads, agent based load balancing and thesaurus based searching. � 2005 IEEE.Item Ambi graph: Modeling ambient intelligent system(2009) Chandrasekaran, K.; Ramya, I.R.; Syama, R.In computing, ambient intelligence (AmI)[2,3] refers to electronic environments that are sensitive and responsive to the presence of people. In an ambient intelligent world, devices work in concert to support people in carrying out their everyday life activities, tasks and rituals in easy, natural way using information and intelligence that is hidden in the network connecting these devices. The ambient intelligence paradigm builds upon ubiquitous computing [4] and human-centric computer interaction design. In this paper, we introduce a notation, called Ambi Graphs, for specifying the work flow in any ambient intelligence system. An ambi graph is elegant when it is designed to adapt to the wide range of users that work on it. � 2009 IEEE.Item Touring ant colony optimization technique for optimal power flow incorporating thyristor controlled series compensator(2009) Sreejith, S.; Chandrasekaran, K.; Simon, S.P.In this work, a study about Touring And Colony Optimization (TACO) for the solution of Optimal Power flow with the use of controllable FACTS device is done. Its proven that this method can provide an enhanced economic solution with the use of controllable FACTS devices. Thyristor controlled series compensators (TCSC) is considered in this method. In deregulated power system environment it is necessary to maintain specified power in contract transmission line path. Hence the specified power flow control, constraints due to the use of FACES devices are included in the OFF problem. The sensitivity analysis is carried out for the location of FACES devices. The proposed method can be considered for saving two sub-problems. The first sub-problem is a power flow control problem by incorporating TCSC in the contract path of power system network and the second sub-problem is the conventional OFF problem. The two sub-problems are simultaneously solved using Touring Ant Colony Optimization (TACO) algorithm. The solutions are compared and tested using a standard IEEE 30-bus system thereby validating feasibility of this approach. �2009 IEEE.