Informatics Publishing Limited

Jino John ¹, P. Parameswaran ²

Affiliations
1 Department of Civil Engineering, V.L.B. Janakiammal College of Engineering and Technology, Coimbatore-641 042, T.N., IN
2 Department of Civil Engineering, P.S.G College of Technology, Coimbatore, T.N., IN

Abstract

The study deals with the investigation undertaken to examine the possibility of using recycled concrete aggregate (RCA) as a substitute to natural coarse aggregate (NCA). The concrete specimens were cast by partially replacing cement by fly ash, and NCA was replaced by 30%of RCA. Twenty % replacement of cement by fly ash gave optimum results for compressive strength, split tensile strength and flexural strength.

Keywords

Recycled Concrete, Aggregate, Fly Ash.

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T. Subbulakshmi ¹, P. Parameswaran ², C. Parthiban ², M. Mariselvi ³, J. Adlene Anusha ³, G. Mahalakshmi ³

Affiliations
1 Department of Information Technology, Sethu Institute of Technology, IN
2 Tata Consultancy Services, IN
3 Department of Computer Science and Engineering, Thiagarajar College of Engineering, IN

Abstract

Distributed Denial of Service (DDoS) attacks were considered to be a tremendous threat to the current information security infrastructure. During DDoS attack, multiple malicious hosts that are recruited by the attackers launch a coordinated attack against one host or a network victim, which cause denial of service to legitimate users. The existing techniques suffer from more number of false alarms and more human intervention for attack detection. The objective of this paper is to monitor the network online which automatically initiates detection mechanism if there is any suspicious activity and also defense the hosts from being arrived at the network. Both spoofed and non spoofed IP's are detected in this approach. Non spoofed IP's are detected using Enhanced Support Vector Machines (ESVM) and spoofed IP's are detected using Hop Count Filtering (HCF) mechanism. The detected IP's are maintained separately to initiate the defense process. The attack strength is calculated using Lanchester Law which initiates the defense mechanism. Based on the calculated attack strength any of the defense schemes such as Rate based limiting or History based IP filtering is automatically initiated to drop the packets from the suspected IP. The integrated online monitoring approach for detection and defense of DDoS attacks is deployed in an experimental testbed. The online approach is found to be obvious in the field of integrated DDoS detection and defense.

Keywords

DDoS Attacks, Lanchester Linear Law, Enhanced Support Vector Machines, Rate Based Limiting, History Based IP Filtering.

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M. Anandaraj ¹, P. Parameswaran ², S. Krishnakumar ¹, T. Ezhilarasi ², V. Thomas Paul ², R. Thirumurugesan ², S. Chandramouli ¹, V. Ramakrishnan ¹, G. Padmakumar ¹, Shaju K. Albert ², B. K. Nashine ¹, V. Prakash ¹, P. Selvaraj ¹

Affiliations
1 Fast Reactor Technology Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India - 603 102, IN
2 Metallurgy & Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India - 603 102, IN

Abstract

One of the spark plug leak detectors employed in high temperature liquid sodium systems had failed to detect a sodium leak and systematic failure analysis was carried out to identify the ischolar_main cause of the failure. Radiography image of the leak port nozzle revealed that the extension wire which was welded with spark plug electrode had snapped. Since the failure originated from the cracks present in the weld, it was decided to standardize the welding procedure of spark plug electrode to extension wire to prevent the possibility of similar failures in future. Three different materials viz, stainless steel, nickel, inconel were chosen as extension wires as well as filler wires to optimize the welding parameters. Microstructural studies in terms of presence of defects, interface integrity between the weld and extension wire as well as that of spark plug electrode were carried out. Based on this, the final choice of welding parameters, material for extension wire and for filler wire to achieve a sound weld was proposed.

Keywords

Spark Plug Detector, Extension Wire, Failure Analysis, Metallography, Welding Procedure Qualification.

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