• Annual Conference of KIPS
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• 2007.05a
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• pp.1356-1358
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• 2007

데이터 병합은 무선 센서 네트워크에서 발생하는 통신량 축소로 에너지 소비의 최소화를 달성하기 위해 적용되는 기법이다. 이런 데이터 병합의 시간 제어는 종단간 지연시간을 최적화하면서 병합 시간의 적응적인 조절로 WSNs의 성능을 크게 향상시킬 수 있다. 따라서 본 논문은 WSNs에서 데이터 정확성과 종단간 지연시간 사이에 발생하는 상충조건의 최적화를 위해 무선 손실을 고려한 적응성 있는 타이밍 제어 프로토콜을 설계하였다. 이 프로토콜은 무선 손실의 변화에 적응성을 있는 데이터 병합을 수행할 수 있도록 선택적 참여율과 중요도를 결정함으로써 네트워크 전체에 패킷 전송 횟수를 균등하게 분배하여 전체 네트워크 안정성을 높일 수 있도록 하였다.

• Journal of the Korean Society of Food Science and Nutrition
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• v.43 no.4
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• pp.530-536
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• 2014

In this study, we investigated the quality and antioxidant activity of wet noodles fortified by adding brown rice and sorghum powders. Wet noodles were divided into four groups: WN-p (wheat flour 100%, purified salt 2%), WBN-b (wheat flour 80%, brown rice powder 20%, bamboo salt (${\times}1$) 2%), WBSN-b (wheat flour 80%, brown rice powder 10%, sorghum powder 10%, bamboo salt (${\times}1$) 2%), and WSN-b (wheat flour 80%, sorghum powder 20%, bamboo salt (${\times}1$) 2%). The wet noodles were evaluated for their quality characteristics and capacities to scavenge free radicals. The weight, volume, capacity to absorb water, and turbidity of cooked WBSN-b were close to those of cooked WN-p. Springiness, cohesiveness, and chewiness of cooked WBSN-b were the highest among all cooked noodles added with brown rice or sorghum powders and textural properties of cooked WBSN-b were not significantly different from WN-P. In the sensory evaluation, the overall acceptance of WBSN-b received the highest score of 6.4 points, which was higher than the score for WN-p. DPPH and hydroxyl radical scavenging activities increased significantly with addition of brown rice and sorghum powder, and radical scavenging activities of WBSN-b and WSN-b were the highest. In conclusion, wet noodles added with 10% brown rice powder, 10% sorghum powder, and 2% bamboo salt (${\times}1$) exhibited the same quality properties of WN-p. Addition of 10% brown rice powder, 10% sorghum powder, and 2% bamboo salt (${\times}1$) increased the sensory and antioxidant activities of wheat flour noodles.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.727-730
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• 2011

본 논문에서는 무선 센서네트워크 환경에 적용할 수 있는 외부 노드의 침입을 탐지하는 방법을 제안하였다. 센서노드의 무선통신을 지원하는 네트워크 장치에 고유하게 부여된 MAC 주소를 이용하여 외부로부터의 허락되지 않는 노드의 네트워크 내부로의 침입을 감지하는 방안을 제안하였다. 실제 센서노드를 이용한 침입탐지 시스템을 개발, 실험을 통하여 효율성을 확인하였다.

• Proceedings of the IEEK Conference
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• 2009.05a
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• pp.45-47
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• 2009

Wireless Sensor Network(WSN) has been very popular in unattended surveillance systems recently. For Applying WSN into Building Automation system(BAS), a novel hierarchial network structure and static routing algorithm which eliminates the scalability limitation of Zigbee are proposed in this paper. The static routing algorithm relying on the hierarchial network address reduces the computational complexity to a great extent and has a real-time performance which satisfies urgent applications well.

• Journal of Information Processing Systems
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• v.5 no.3
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• pp.135-144
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• 2009

Most of the tasks in wireless sensor networks (WSN) are requested to run in a real-time way. Neither EDF nor FIFO can ensure real-time scheduling in WSN. A real-time scheduling strategy (RTS) is proposed in this paper. All tasks are divided into two layers and endued diverse priorities. RTS utilizes a preemptive way to ensure hard real-time scheduling. The experimental results indicate that RTS has a good performance both in communication throughput and over-load.

• Annual Conference of KIPS
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• 2007.05a
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• pp.1100-1101
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• 2007

This paper proposes an efficient mechanism of node membership verification within the groups of sensors in a wireless sensor network (WSN). We utilize one-way accumulator to check the memberships of the legitimate nodes in a secure way. Our scheme also supports the addition and deletion of nodes in the groups in the network. Our analysis shows that, our scheme could be well-suited for the resource constrained sensors in a sensor network and it provides a lightweight mechanism for secure node membership verification in WSN.

• Annual Conference of KIPS
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• 2007.05a
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• pp.1091-1092
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• 2007

Wireless sensor networks (WSN) can be used in military surveillance, in which highly confidential data needs to be transmitted. In effect, security becomes a very important aspect in such networks. We present an efficient key management scheme for WSN. Our scheme is an improvement over SHELL [1] and mostly relies on communication within a cluster of nodes.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.48 no.2
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• pp.86-95
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• 2011

Sensor nodes in wireless sensor networks are vulnerable to security than wired network due to using limited hardware performance and wireless communications that network topology changes frequently. Among techniques to enhance the security, the node authentication mechanism is used to defend against data forgery attacks using the ID of the node or to interfere with the routing of the network routing. In this paper, we proposed the AM-E mechanism that makes authentication key by using the energy value of node requesting authentication and performs the communication procedures for data transfer between different nodes. Because the energy value of node is changed depending on time, every time the authentication request is, an authentication key is changed. These features enhance the security of sensor networks and will help to configure the more secure WSN.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.1
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• pp.198-204
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• 2012

Generally, the clustering of sensor nodes in WSN is a useful mechanism that helps to cope with scalability problem and, if combined with network data aggregation, may increase the energy efficiency of the network. The Hierarchical clustering routing algorithm is a typical algorithm for enhancing overall energy efficiency of network, which selects cluster-head in order to send the aggregated data arriving from the node in cluster to a base station. In this paper, we propose the improved-LEACH that uses comparably simple and light-weighted policy to select cluster-head nodes, which results in reduction of the clustering overhead and overall power consumption of network. By using fine-grained power model, the simulation results show that i-LEACH can reduce clustering overhead compared with the well-known previous works such as LEACH. As result, i-LEACH algorithm and LEACH algorithm was compared, network power-consumption of i-LEACH algorithm was improved than LEACH algorithm with 25%, and network-traffic was improved 16%.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.7B
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• pp.1098-1104
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• 2010

Recently, a variety of research of multi-hop routing protocol have been done to balance the sensor node energy consumption of WSN(wireless sensor network) and to improve the node efficiency for extending the life of the entire network. Especially in multi-hop protocol, a variety of models have been concerned to improve energy efficiency and apply in the reality. In multi-hop protocol, we assumption that energy consumption can be adjusted based on the distance between the sensor nodes. However, according to the physical property of the actual WSN, it's hard to establish this assumption. In this dissertation, we propose low-power sub-cluster protocol to improve the energy efficiency based on the spread of distance. Compared with the previous protocols, this proposed protocol can be effectively used in the wireless sensing networks.