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주기적 이동 노드를 위한 Delay-Tolerant Network 라우팅 알고리즘
이영세(Youngse Lee),이고운(Gowoon Lee),조항기(Hangki Joh),유인태(Intae Ryoo) 한국디지털콘텐츠학회 2014 한국디지털콘텐츠학회논문지 Vol.15 No.1
Delay-Tolerant Network (DTN) is an asynchronous networking technology that has been deployed for the networking environment in which steady communication paths are not available, and therefore it stores receiving data in a data storage and forward them only when the communication links are established. DTN can be applied to sensor networks and mobile ad-hoc network (MANET) as well as space communication that supports data transmissions among satellites. In DTN networking environments, it is very important to secure a scheme that has relatively low routing overhead and high reliability, so that it can enhance the overall routing speed and performance. In order for achieving efficient data transmissions among the nodes that have comparatively periodic moving patterns, this paper proposes a time information based DTN routing scheme which is able to predict routing paths. From the simulation results using Omnet++ simulation tools, it has been verified that the proposed time information based DTN routing algorithm shows satisfied levels of routing speed and routing reliability even with lower routing overheads.
와이맥스 메쉬 네트워크에서 LSQR 스케줄링을 이용한 QoS 라우팅 성능 향상에 관한 연구
탁우영(Wooyoung Tak),이고운(Gowoon Lee),조항기(Hangki Joh),유인태(Intae Ryo) 한국디지털콘텐츠학회 2013 한국디지털콘텐츠학회논문지 Vol.14 No.4
Recently, wireless mesh network has been focused as a core technology for resolving the issues of shadow zone and distributed bypass route as it has broad service coverage as well as good scalability features. It, however, provides users with relatively lower QoS than infrastructure-based networks. In order for addressing this QoS issue and also enhancing the routing performance of mobile WiMax mesh network, this paper proposes a load sensing QoS routing (LSQR) scheme. In the proposed LSQR, each node figures out network congestion status and selects a bypass route accordingly. With this scheme, we can expect good load balancing effect by changing the routing paths from centralized links to distributed links under a heavy traffic condition. From the simulation results using NS-2, it has been verified that the LSQR shows lower packet loss rates and data transmission delays than the existing representative routing schemes.
서비스 연속성 지원을 위한 WiBro-WiFi 상호연동 아키텍쳐 설계 및 성능 분석에 관한 연구
목경렬(Kyungyul Mok),이고운(Gowoon Lee),조항기(Hangki Joh),유인태(Intae Ryoo) 한국디지털콘텐츠학회 2013 한국디지털콘텐츠학회논문지 Vol.14 No.4
WiBro technology provide mobile devices with a transmission speed of more than 1 Mbps even under the condition of high mobility (120 km/h). In a building, however, there is more demand for high bandwidth for various activities, and WiBro services may not be available. In order to guaranteeing a seamless service continuity and high transmission capability for mobile users within a specific establishment that has deployed WiBro network, we should secure an internetworking platform for WiBro and WiFi networks. This paper introduces WiMax forum and 3GPP standards, proposes WiBro-WiFi Interworking (WWI) architecture, its implementation details, and finally verifies validity of the proposal by using OPNet simulations.
국내 판매중인 여성청결제의 사용실태 및 함유 보존제 분석
김완서(Wanseo Kim),윤영인(Youngin Youn),이고운(Gowoon Lee),박나연(Na-Youn Park),고영림(Younglim Kho),최경호(Kyungho Choi) 한국환경보건학회 2018 한국환경보건학회지 Vol.44 No.2
Objectives: Preservatives, suspected to be endocrine disrupting chemicals, are widely used in feminine hygiene products for the prevention of deterioration. Information regarding the usage patterns of feminine hygiene products and the concentrations of preservatives in these products is limited. The present study was conducted to investigate the use of feminine cleansers among Korean women and quantify the concentration of preservatives in feminine cleansers. Methods: Approximately 500 women were recruited from the city of Busan in August 2017 and a questionnaire survey was conducted on the use of feminine cleansers. Several major feminine hygiene products (n=69) were identified and selected for analysis of 22 preservatives. Following appropriate preparation, the products were analyzed by HPLC/DAD. Results: Over 70% of the participating women used at least one feminine cleanser. Marital status and parity were associated with the frequency of use. Liquid was most frequently used form of feminine cleanser (66.6%). The greatest proportion of subjects answered that they use it ‘one to two times per week’ (36.5%). Among the 69 feminine cleansers, benzoic acid, sorbic acid, phenoxyethanol, and methyl paraben were detected at 144-4,428 μg/g, 195-1,470 μg/g, 269-4,237 μg/g, and 625-4,901 μg/g, respectively. BA was the most frequently detected (46.4%). Conclusions: In the present study, the characteristics of feminine cleanser use among Korean women were investigated. Based on an analysis of preservatives in the feminine hygiene products, one product was determined to exceed the maximum authorized concentration of MeP (0.4%). Our results will help refine exposure and risk assessment for toxic chemicals in feminine cleansers.