http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
모바일 싱크를 가지는 무선 센서 네트워크에서 고립 노드비율 감소 방법
서봉수(Bongsue Suh) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.2
While there have been many researches on the wireless sensor networks with mobile sink for the efficient data gathering from sensor nodes, it is inevitable that there occurs isolated nodes due to the finite transmission distance of sensor nodes. In this paper, we propose two strategies to reduce the chance of having isolated nodes: VMP where sensor nodes increases the maximum transmission power and VMP-ELR where each sensor node uses two sets of mobile sinks travelling path and sensor nodes data forwarding paths. From simulations of the proposed strategies applied to four previous data forwarding methods, we confirm that our proposed strategies reduce the isolated node ratio, and VMP-ELR outperforms VMP more significantly for the case of the lower values of transmission distance.
에너지 수집 기능이 있는 무선 센서 네트워크에서 데이터 수집 회수를 증가 시키는 기법
서봉수(Bongsue Suh),최진식(Jin-Seek Choi) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.4
The structure of many possible applications of wireless sensor networks with energy harvesting functions can be one dimensional. For this environment, this paper introduces a relay node that forwards data of a number of neighboring sensor nodes to data sink so as to increase the data gathering frequency while maintaining all sensor nodes alive. We also propose an algorithm that determines the relay node, the per-node based forwarding strategies, the sleep duration after next round, based on the values of remaining energy, harvesting power, and the estimated communication energy of every sensor nodes. Numerical analysis based on communication energy model and practical assumptions shows that the proposed algorithm has at most 10 times larger value of data gathering frequency compared to single hop and multi-hop forwarding only strategies.
클러스터링 계층의 무선 센서 네트워크에서 데이터 오차 허용값에 기반을 둔 에너지 절감 기법
서봉수(Bongsue Suh),김태준(Tae-Joon Kim) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.3
Sensor nodes in wireless sensor networks should provide the application services as long as possible or permanently. In this paper, we propose a strategy that reduces energy consumption for communication by allowing an error range in data accuracy for cluster-based wireless sensor networks. We evaluate the communication energy consumption of the proposed strategy and compare it with that of the traditional one. As a result, the energy consumption decreases significantly as the allowable error range increases. Based on the proposed strategy and its results, it will be feasible to design and implement an optimal wireless sensor network by analysing the relations of the requirements of sensor node's power supply, network life, size of clusters, and allowable error ranges.
에너지 수집 기능이 있는 무선 센서 네트워크에서 오차 허용값 기반의 휴면 시간 최소화 기법
서봉수(Bongsue Suh),김태준(Tae-Joon Kim) 한국정보기술학회 2010 한국정보기술학회논문지 Vol.8 No.9
This paper proposes and analyzes an algorithm to minimize sleep duration of sensor nodes for one-dimensional wireless sensor networks with energy harvesting functions while keeping all sensor nodes alive, based on the error margin in data gathered by sensor nodes. Based on error margin, remaining energy level, and expected communication energy of every sensor node, data collecting nodes determines relay node, data forwarding strategy, and sleep duration. Numerical analysis based on mathematical communication energy model and practical assumptions shows that the proposed algorithm has the sleep duration of 1/200 of single-hop only strategy without relay node. Also, we confirm that sleep duration decreases significantly as the error margin increases.
무선 센서 노드의 잔여 에너지와 그룹화를 이용한 효과적인 데이터 수집 방법
서봉수(Bongsue Suh) 한국정보기술학회 2012 한국정보기술학회논문지 Vol.10 No.2
In the traditional single-hop data forwarding scheme where a number of wireless sensor nodes transmit data to the data sink directly, the nodes have the large variation of residual energy values. In this paper, we propose a data forwarding scheme, where nodes are grouped around representative nodes with relatively high remaining energy values and the representative nodes forward data received from the nodes within their own group to data sink node. Through this procedure, the residual energy values of all sensor nodes approach to be equalized as time goes on. Numerical analysis based on communication energy model and practical assumptions shows that the proposed scheme has better performances in total energy consumption and network life, compared to the traditional single-hop forwarding scheme.
무선 센서 네트워크의 수명 증대를 위한 개선된 데이터 전달 방법
서봉수(Bongsue Suh) 한국정보기술학회 2012 한국정보기술학회논문지 Vol.10 No.8
In this paper, we modify the previous grouping and data forwarding strategy to maintain the increased wireless sensor network life regardless of the position of the data sink node. The proposed strategy sets the group size with consideration given to the distance between the representative node and the data sink node. Numerical analysis based on the communication energy model and practical assumptions shows that the proposed strategy gives longer network life when the data sink approaches to the center of the network, and when the data reduction ratio of the representative node increases. From this result, it is expected that the long network life can be maintained by choosing the adaptive grouping strategy depending on the position of the data sink node.
이동성과 에너지 수집 기능이 있는 무선 센서 네트워크에서 센서 노드의 동작 방법 및 이의 성능 분석
서봉수(Bongsue Suh),김태준(Tae-Joon Kim) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.1
In this paper, we propose the operational strategy of mobile sensor nodes for wireless sensor networks having functions of energy harvesting and recharging for sensor nodes. According the proposed strategy, each mobile sensor node has five states, active, sleep, move1, move2, and charging. The transition between states is made according to the remaining energy, energy for moving to harvesting node, and sleep duration of each sensor node. As the performance measures, we evaluate the service availability and the number of recharges according to the distance between mobile sensor node and energy harvesting node. The results show that the service availability decreases as the distance between sensor node and energy harvesting node increases and as sleep duration decreases. In addition, the number of recharges has less relationship with the sleep duration as the distance increases.
Energy-Efficient Data Forwarding Strategies for Linear Wireless Sensor Network
Bongsue Suh(서봉수),Tae-Joon Kim(김태준) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.9
For the linear wireless sensor networks, the sophisticated calculation or management policies of the existing data forwarding algorithms based on the hierarchical structure can be the redundancies that waste the energy of sensor nodes. In this paper, we propose hybrid data forwarding algorithms in which each node respectively has one of two possible forwarding scheme, single hop forwarding and multi-hop forwarding. The determination depends on the distribution of remaining energy levels of every sensor nodes over the network. The mathematical analysis and the numerical results show that the proposed scheme significantly increases network lifetime compared to strategies with the single hop or multi-hop forwarding only. The proposed schemes also show the better performance in remaining energy distribution of sensor nodes after the network’s life.
V2I 시스템에서 가변 전송 거리에 기반한 근사 최적의 전달 지연을 제공하는 데이터 전달 방법
서봉수(Bongsue Suh) 한국정보기술학회 2019 한국정보기술학회논문지 Vol.17 No.12
For V2I(Vehicle-to-Infrastructure) systems with energy-constrained RSUs (Road Side Units), the data delivery strategies should be designed with consideration given to the RSUs’ energy consumption as well as the data delivery time. In this paper, based on the strategy that determines the RSU’s transmission distance according to the its remaining energy, we propose a modified data delivery strategy that nearly satisfies the data delivery delay by having the RSUs with relatively high transmission distance participate in data delivery procedure with a higher priority. As a result, our proposed method has the RSUs with smaller transmission distance exempt from data delivery and their energy consumption. Through a numerical analysis, compared to the previous methods our proposed strategy is shown to be more efficient in respect to the data delivery delay and the RSU’s energy consumption.