YMCA University of Science and Technology

About: YMCA University of Science and Technology is a education organization based out in Faridabad, India. It is known for research contribution in the topics: Web page & Web crawler. The organization has 299 authors who have published 568 publications receiving 4547 citations.

Multi-objective thermodynamic optimization of solar parabolic dish stirling heat engine with regenerative losses using NSGA-II and decision making

Abstract: The proposed work investigates optimal values of various decision variables that simultaneously optimize power output, net-work output and second law efficiency of solar driven Stirling heat engine with regenerative heat losses, conducting thermal bridging losses using evolutionary algorithm based on NSGA-II in Matlab simulink environment. Effects of design parameters as absorber temperature, concentrating ratio, radiative and convective heat transfers are included in the analysis. Pareto frontier is obtained for triple and dual objectives and the best optimal value is selected through four different decision making techniques viz. Fuzzy, Shannon entropy, LINMAP and TOPSIS. Triple objective evolutionary approach applied to the proposed model gives power output, net-work output and second law efficiency as (38.87 kW, 1.24 kJ, 0.3156) which are 18.19, 16.78 and 31.51% lower in comparison with reversible system. With the objective of error investigation, the average and maximum error of the obtained results are figured at last.

Mathematical modeling and fuzzy availability analysis for serial processes in the crystallization system of a sugar plant

Abstract: The binary states, i.e., success or failed state assumptions used in conventional reliability are inappropriate for reliability analysis of complex industrial systems due to lack of sufficient probabilistic information. For large complex systems, the uncertainty of each individual parameter enhances the uncertainty of the system reliability. In this paper, the concept of fuzzy reliability has been used for reliability analysis of the system, and the effect of coverage factor, failure and repair rates of subsystems on fuzzy availability for fault-tolerant crystallization system of sugar plant is analyzed. Mathematical modeling of the system is carried out using the mnemonic rule to derive Chapman–Kolmogorov differential equations. These governing differential equations are solved with Runge–Kutta fourth-order method.

Prioritising user stories in agile environment

Abstract: In the last few years Agile methodologies appeared as a reaction to traditional software development methodologies. In Agile environment the requirements from the client are always taken in the form of user-stories and prioritization of requirements is done by Moscow method, validate learning and walking skeleton methods. By literature survey it has been observed that these methods are not efficient because they do not consider importance of user-stories by client. In this research work some importance related and effort related factors are considered on the basis of which the prioritization of user-stories is done. Further the feasibility of work has been validated by a case study of Enable Quiz which is a lightweight technical quizzing solution; for companies that hire engineers. The research work will allows the companies to better screen job candidates and assess their internal talent for skills development.

DDoS tools: Classification, analysis and comparison

Abstract: Distributed Denial of Service (DDoS) attacks are the major concern for the security experts. DDoS attack presents a serious risk to the internet. In this type of attack a huge number of accommodated targets send a request at the victim's site simultaneously, to exhaust the resources (whether computing or communication resources) within very less time. In the last few years, it is recognised that DDoS attack tools and techniques are emerging as effective, refined, and complex to indicate the actual attackers. Due to the seriousness of the problem many detection and prevention methods have been recommended to deal with these types of attacks. This paper aims to provide a better understanding of the existing tools, methods and attack mechanism. In this paper, we commenced a detailed study of various DDoS tools. This paper can be useful for researchers and readers to provide the better understanding of DDoS tools in present times.

Quality of service provisioning transport layer protocol for WBAN system

Abstract: Wireless Body Area Network (WBAN) applications are looking forward for better and effective environment because of its heterogeneous and wearable nature. Recent applications of WBAN need to be support both real time traffic (sensitive to end-to-end packet delay) and non-real time traffic (sensitive to packet loss), which further origin the problem of diverse QoS requirements. So the first step of this paper is to study QoS issues related to each layer and extort why transport layer is more devoted to QoS issue. Then we inspect the limitations of current existing transport protocols for WBAN system. Considering these limitations we have designed a protocol, which tries to handle QoS in an efficient way. As we know transport layer deals QoS significantly, proposed protocol was structured to overcome some QoS problems related to this layer like packet handling, reliable packet transmission with loss recovery and congestion control. The intention of proposed schema is to provide end-to-end bidirectional (both upstream and downstream) and bi-functional (both packet based and event based) reliability module. This is also taking care of each kind of packets loss. Its intelligent packet handling method provides priority fairness to overcome starvation problem. This proposed work is making an effort to reduce retransmission of duplicate packets and relevant to control congestion.