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Receiver-driven Channel Rendezvous for Multi-channel Wireless Sensor Networks
Obaidur Rahman,Choong Seon Hong 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.1A
In this work. a new receiver-driven channel rendezvous mechanism is proposed for multi-channel communication in Wireless sensor networks (WSNs). The work is a light-weight scheduled scheme. seems to be incurring less overhead in compare to traditional common control channel based rendezvous mechanisms.
Obaid Ur Rahman,Jeena Kim,Caroline Mahon,Musharraf Jelani,강창수 한국유전학회 2021 Genes & Genomics Vol.43 No.5
Background Amyloidosis cutis dyschromica (ACD) is a rare variant of cutaneous amyloidosis. This disorder often clusters in families, and it has been suggested that genetic factors might be involved in its development. Objective To identify the genetic causes of ACD, we recruited a consanguineous Pakistani family with multiple cases of ACD that display a recessive mode of inheritance. Methods We performed whole-exome sequencing of samples from 7 members of this family, followed by bioinformatic and in silico analyses to identify the causative variant. For the replication study, we recruited a British family with Pakistani ancestry, and sequenced all exons of glycoprotein non-metastatic melanoma protein b (GPNMB) to identify mutations. We also investigated efects of the mutations on the stability of the GPNMB protein using the I-TASSER three-dimensional modeling tool. Results We found a novel homozygous mutation, p.Gly363Val (c.1088 G>T), in GPNMB in all afected cases. In a replication study, another homozygous missense mutation in GPNMB, pIle174Met (c.522 C>G), was carried by the afected son. The two mutations were not observed in our in-house data set comprising 217 healthy Pakistani individuals or in The Genome Aggregation Database. Our structural modeling of GPNMB suggested that p.Gly363Val enhanced its stability, whereas p.Ile174Met caused instability. Conclusions This study reports two novel missense mutations in two Pakistani families that cause ACD. The mutations appear to infuence GPNMB stability, as revealed by protein modeling.
Sensor Route Management Scheme for Wireless Sensor Network
( Obaidur Rahman ),( Choong Seon Hong ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.1
A wireless sensor network is the combination of a large number of deployed sensors over an area. Communication between the sensors is the most important factor for a successful sensor network. It is mandatory that long distance and multi-hop communication will occur between sensors. Generally sensors relay the sensed data of a particular territory to the command center via a base station. For the non uniformed deployment of sensors many sensors may deploy in hostile areas surrounded by full of obstacles or in other condition it may be out of the direct communication range of the base station. It seems a critical problem for routing data to and from those sensors to the base station. This paper proposes a route management scheme using a dynamic load balancing approach based on residual energy of each agent sensors.
An Efficient Duty Cycle Based Communication Scheme for Wireless Sensor Network
( Obaidur Rahman ),( Muhammad Mostafa Monowar ),( Cho Jin Woong ),( Lee Jang Yeon ),( Choong Seon Hong ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.2
Due to the limitation of battery life time, energy is one of the most crucial issues for wireless sensor networks. Thus this paper proposes an energy efficient duty cycle scheme to conserve energy mostly. To handle the large varieties of data (i.e., both low and high traffic load) the proposed duty cycle scheme ensures a fair access period (FAP) and a prioritized access period (PAP). The idea presented in this paper able to reduce the collision probability and energy consumption. Finally simulation outputs have demonstrated the effectiveness of the proposed duty cycle task and showed a noticeable performance in terms of energy usage.
DEVELOPMENT AND VALIDATION OF COUPLED DYNAMICS CODE 'TRIKIN' FOR VVER REACTORS
Obaidurrahman, K.,Doshi, J.B.,Jain, R.P.,Jagannathan, V. Korean Nuclear Society 2010 Nuclear Engineering and Technology Vol.42 No.3
New generation nuclear reactors are designed using advanced safety analysis methods. A thorough understanding of different interacting physical phenomena is necessary to avoid underestimation and overestimation of consequences of off-normal transients in the reactor safety analysis results. This feature requires a multiphysics reactor simulation model. In this context, a coupled dynamics model based on a multiphysics formulation is developed indigenously for the transient analysis of large pressurized VVER reactors. Major simplifications are employed in the model by making several assumptions based on the physics of individual phenomenon. Space and time grids are optimized to minimize the computational bulk. The capability of the model is demonstrated by solving a series of international (AER) benchmark problems for VVER reactors. The developed model was used to analyze a number of reactivity transients that are likely to occur in VVER reactors.