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Gowrishankar,
- Differential Access Model for User Class Based Call Admission Control Mechanism in Next Generation Wireless Networks
Abstract Views :140 |
PDF Views:3
Authors
Affiliations
1 Information Science and Engineering Department, Acharya Institute of Technology, Bangalore, IN
2 Computer Science and Engineering Department, B M Sreenivasaiah College of Engineering, Bangalore, IN
1 Information Science and Engineering Department, Acharya Institute of Technology, Bangalore, IN
2 Computer Science and Engineering Department, B M Sreenivasaiah College of Engineering, Bangalore, IN
Source
Wireless Communication, Vol 4, No 7 (2012), Pagination: 351-354Abstract
The Next Generation Wireless Networks (NGWN) are envisioned to offer abundant services to its users. Quality of Service (QoS) needs varies amongst users as per application requirements and user class. Hence both from the service provider as well as user point of view user differentiation is an important aspect in NGWN. Optimal revenue generation along with guaranteeing the agreed upon QoS to the users’ is a challenging problem for the network service providers. With more number of users in the system more revenue will be generated, but guaranteeing the agreed upon QoS becomes difficult. Call Admission Control (CAC) directly controls the number of users in the system and hence must be carefully designed. This paper proposes a differential access model for CAC mechanism in NGWN based on the users’ QoS needs. The model is based on allocating more number of channels to high priority users as compared to low priority users. The simulation results for call blocking probability of different user classes and the system are presented.Keywords
Call Admission Control, Differential Access Model, Next Generation Wireless Networks, Quality of Service, User Class.
- Study of Mechanical Properties of Dual Phase EN19 Steel (AISI4140)
Abstract Views :170 |
PDF Views:0
Authors
Affiliations
1 Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Manipal - 576104, Karnataka, IN
1 Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Manipal - 576104, Karnataka, IN
Source
Indian Journal of Science and Technology, Vol 9, No 37 (2016), Pagination:Abstract
Medium carbon steels are high strength steels which include AISI4140 as an important member in low alloy category. These steels show positive response to all variety of heat treatments. The present work aims to experimentally investigate the properties like Tensile, Hardness and Impact Strength on AISI4140 steel. The as-bought properties of AISI4140 steel have good ductility, shock resistance but low wear resistance and shorter service life. However such properties can be further improved through various heat treatment processes. In the present investigation the effect of dual phase heat treatment and mechanical property analysis of AISI 4140 are studied. The effect of normalizing as pretreatments on dual phase structure and property at different inter-ctitical temperatures holding for 2 hours followed by water quenching are investigated in view of improvement in mechanical properties like hardness, impact toughness and tensile. Test specimens are prepared and subjected to preliminary heat treatment. The dual phase structures (Ferrite-Martensite) by heating to three different inter-critical temperatures are obtained by rapid quenching in water medium. The resultant dual phase microstructure is also studied. Then tensile, impact and hardness tests are conducted and compared with asbought condition results. The dual phase steels find applications widely in automobile parts and general constructional applications where wear resistance is of the serious concern.Keywords
Austempering, Annealing, Dual Phase Ferrite, Martensite, Steels.Full Text