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Cluster Based Object Detection in Wireless Sensor Network
Md. Obaidur Rahman,Choong Seon Hong 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.2D
Sensing and coverage are the two relevant tasks for a sensor network. Quality of sensor network totally depends upon the sensing ability of sensors. In a certain monitored region success of detecting or sensing an object with the help of sensor network tells that how efficiently the network coverage perform. Here in this paper we have proposed a clustering algorithm for the deployment of sensors and thus calculated the object detection probability. Actually by this work we can easily identify the present network coverage status and accordingly can take action for its improvement.
Md. Sohel Rana,Sujan Kumar Das,Md. Obaidur Rahman,Farid Ahmed,Md. Abul Hossain 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.5
Vanadium (V) doped zinc sulfi de (ZnS) nanoparticles have been synthesized in the doping concentration of 0.2, 0.4, 0.6, 0.8, and 1 wt% by chemical co-precipitation method, where de-ionized water was used as solvent and the precursors were Zn(CH3COO)2·2H2O, Na2S and V2O5. The synthesized nanoparticles have been characterized by XRD, UV–Vis spectroscopy, FTIR spectroscopy and precision impedance analyzer (PIA). XRD studies revealed that all the samples exhibit cubic structure and confi rmed the incorporation of V into ZnS lattice. The calculated average crystallite size was varied in the range of 2.16–2.82 nm. The red shifting of the absorption edge was observed from the UV–Vis study and the direct optical band gap (Eg ) was decreased from 3.63 to 3.35 eV with increasing the doping concentrations. The various vibrational modes were observed by the FTIR spectroscopy. The characteristic vibrational peaks were found near at 666, 615 and 478 cm −1 . The PIA study showed that frequency dependent dielectric constant, loss tangent and ac resistivity were high at the lower frequency, while the ac conductivity was low at higher frequency. The bandgap tuning behavior of ZnS nanoparticles with V-doping concentrations may find interesting applications in optoelectronic devices.
An Efficient Rate Control Protocol for Wireless Sensor Network Handling Diverse Traffic
Muhammad Mostafa Monowar,Md. Obaidur Rahman,Choong Seon Hong(홍충선) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.2A
Wireless Sensor Network typically incorporates diverse applications within the same network. A sensor node may have multiple sensors i.e. light, temperature, seismic etc with different transmission characteristics. Each application has different characteristics and requirements in terms of transmission rates, bandwidth, packet loss and delay demands may be initiated towards the sink. In this paper we propose Heterogeneous Traffic Oriented Rate Control Protocol (HTRCP) which ensures efficient rate control for diverse applications according to the priority specified by the sink. Moreover, HTRCP ensures the node priority based hop by hop dynamic rate adjustment for high link utilization.
An Rate Control Protocol for Real Time Traffic in Wireless Sensor Network
모하마드 무스타파 모노워(Muhammad Mostafa Monowar),엠디 오베이둘 라만(Md. Obaidur Rahman),홍충선(Choong Seon Hong) 한국정보과학회 2008 한국정보과학회 학술발표논문집 Vol.35 No.1
Wireless Sensor Network typically incorporates various real time applications that must meet timing constraints under severe resource limitations. Due to the high data rate and burst traffic for that type of applications, occurrence of congestion is very common. Ensuring the end-to-end deadline under congested scenario is quite challenging. In this paper we propose a hop-by-hop rate control algorithm which avoids the congestion as well as ensures that the real time traffic will meet the end-to-end deadline by guaranteeing the meeting of local deadline at intermediate hop. Finally, simulation has demonstrated the effectiveness of our approach.