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Arunachalam, V. P.
- 3 Dimensional Geographical IP Traceback Using Direction Ratio Sampling Algorithm (DRSA)
Authors
1 Department of Computer Science Engineering, SNS College of Technology, Sathy Main Road, Coimbatore-641035, Tamil Nadu, IN
2 SNS College of Technology, Sathy Main Road, Coimbatore-641035, IN
3 Hindustan Institute of Technology, Pollachi Main Road, Coimbatore-641032, IN
Source
Software Engineering, Vol 1, No 3 (2009), Pagination: 97-100Abstract
An important and challenging problem is that of tracing DOS/DDOS attack source. Among many IP Traceback schemes, a recent development is DGT (Directed Geographical Traceback). Though multidirectional two dimensional DGT schemes are available, ξξξ in the real scenario, three dimensional, Multidirectional DGT has potential applications. The direction ratio algorithm [DRA] has the limitation of the impossibility of ensuring sufficient unused space in the packet header for the complete DRL (Direction Ratio List) especially when the length of the path is not known apriori. In this paper that limitation is overcome using DRSA (Direction Ratio Sampling Algorithm) which works well for Three dimensional, Multi-Directional, Geographical IP traceback. This approach enables the attack path reconstruction easily possible. In conclusion, DRSA is a robust scheme of attack path reconstruction in geographical traceback.Keywords
DOS (Distributed Denial of Service), DGT (Directional Geographical Traceback), 3DMDGT (Three Dimensional, Multi-Directional Geographical Traceback), DRA (Direction Ratio Algorithm), DRSA (Direction Ratio Sampling Algorithm).
- Implementation of Particle Swarm Optimization Technique in Designing Power System Stabilizer
Authors
1 Department of Electrical and Electronics Engineering, SNS College of Technology, Coimbatore-641035, IN
2 SNS College of Technology, Coimbatore-641035, IN
Source
Programmable Device Circuits and Systems, Vol 3, No 14 (2011), Pagination: 820-825Abstract
In the past, fixed conventional power system stabilizers are designed based on linearized model of power systems for particular operating conditions. These stabilizers are effectively used for damping out low frequency oscillations. When the Power System is suddenly loaded or removed, it is subjected to oscillations which results in increased settling time i.e., the system becomes unstable. Hence the conventional Power System Stabilizer is not effective. So in order to overcome the disadvantage and to enhance the system damping, the generators are equipped with modern Power System Stabilizers that provide supplementary feedback stabilizing signals in the excitation systems. This can be designed by a heuristic method called PSO which is a robust stochastic optimization technique that works based on the movement and intelligence of swarms. It uses a number of agents (particles) that constitute a swarm moving around in the search space looking for the best solution. It is preferred in order to achieve the optimal Eigen value for system stability and to reduce the settling time. Hence this technique holds best to tune the Power System Stabilizer parameters based on Settling time, Peak overshoot and Computation time.Keywords
Particle Swarm Optimization, Power System Stabilizer, Automatic Voltage Regulator.- An Investigation of 2 n Direction Geographical Traceback Using Simulation of IP Traceback Strategies
Authors
1 Department of Computer Science Engineering SNS College of Technology, Sathy Main Road, Coimbatore-641035, Tamil Nadu, IN
2 SNS College of Technology, Sathy Main Road, Coimbatore-641035, IN
3 Hindustan Institute of Technology, Pollachi Main Road, Coimbatore-641032, IN
Source
Networking and Communication Engineering, Vol 1, No 3 (2009), Pagination: 110-114Abstract
DoS / DDoS(Distributed Denial of Service) attacks deny regular, internet services accessed by legitimate users, either by blocking the services completely, or by disturbing it completely, so as to cause customer baulking. Several traceback schemes are available to mitigate these attacks. The simulation approach also can be used to test the performing effects of different marking schemes in large-scale DDoS attacks. Based on the simulation and evaluation results, more efficient and effective algorithms, techniques and procedures to combat these attacks may be developed. DGT8, directional geographical trackback scheme, with 8 directions is one of them. Having a limited set of 8 directions, DGT8 may not work for routers with more than 8 interfaces. In this paper, we propose M-DGT i.e DGT 16, a 16 directional geographical traceback scheme having all the advantages of DGT. The 16 directions, though not having exactly equal interface, have nearly equal measures, and are identified using a novel scheme of Segment Direction Ratios (SDR). The SDR concept and the associated marking scheme allow the victim to defend against DDoS attacks independent of its ISP and also the generalization to DGT2n, having 2n directions (n>4).
Keywords
DoS, DDoS, DGT (Directed Geographical Traceback), IP Traceback, SDR (Segment Direction Ratio).- Modeling and Synthesizing of Drum CAM Mechanism for Printing Machine
Authors
1 Department of Mechanical Engineering, Government College of Technology, Coimbatore - 641 013, IN
Source
Manufacturing Technology Today, Vol 3, No 8 (2004), Pagination: 18-22Abstract
In a concurrent engineering environment, modeling and synthesizing of mechanism for specific industrial application through CMC Technology is becoming very advanced and may eventually dominate the product development process. Modeling and synthesis strategy plays vital role in improving company competitiveness through the fast adoption of modifications to the original design. The availability and affordability of advanced computing facility has paved the way for increasing utilization of prototypes that are created in computer-based environment. An increasing number of manufacturing organizations are placing direct emphasis on operations improvement as a means of achieving competitive success. Small and medium enterprises generally lack the resources in capital, time and expertise to implement business process re-engineering.
This paper discusses the drum Cam-roller follower mechanism used in printing machine and the problem associated in its functioning. Analyzing the failure of drum Cam-roller follower mechanism, it has been found that the roller often fails due to improper profile generated in the drum conventionally. The mechanism failure was rectified with proper modifications using modeling and synthesis with ruled surface to the follower and an offset curve solution to Cam contour profile by adopting CNC machining. A software program has been developed to house all of the critical data pertaining to the manufacture of Cylindrical Cam Roller Follower using I-DEAS, and M.S. OFFICE-EXCEL software.