무선센서네트워크에서 LEACH 라우팅 프로토콜을 적용한 파티클 센서의 에너지 효율적인 알고리즘

홍성화,김훈기,Hong, Sung-Hwa,Kim, Hoon-Ki 한국시뮬레이션학회 2009 한국시뮬레이션학회 논문지 Vol.18 No.3

The sensor nodes that form a wireless sensor network must perform both routing and sensing roles, since each sensor node always has a regular energy drain. The majority of sensors being used in wireless sensor networks are either unmanned or operated in environments that make them difficult for humans to approach. Furthermore, since many wireless sensor networks contain large numbers of sensors, thus requiring the sensor nodes to be small in size and cheap in price, the amount of power that can be supplied to the nodes and their data processing capacity are both limited. In this paper, we proposes the WSN(Wireless Sensor Network) algorithm which is applied sensor node that has low power consumption and efficiency measurement. Moreover, the efficiency routing protocol is proposed in this paper. The proposed algorithm reduces power consumption of sensor node data communication. It has not researched in LEACH(Low-Energy Adaptive Clustering Hierarchy) routing protocol. As controlling the active/sleep mode based on the measured data by sensor node, the energy consumption is able to be managed. In the event, the data is transferred to the local cluster head already set. The other side, this algorithm send the data as dependent on the information such as initial and present energy, and the number of rounds that are transformed into cluster header and then transferred. In this situation, the assignment of each node to cluster head evenly is very important. We selected cluster head efficiently and uniformly distributed the energy to each cluster node through the proposed algorithm. Consequently, this caused the extension of the WSN life time.

服飾文化交流를 통해 본 古代 韓日관계

홍성화(Hong Sung-Hwa) 한복문화학회 2012 韓服文化 Vol.15 No.3

The objective of this article is to analyze the exchange of traditional costumes between ancient Korea and Japan and to re-establish relationships between the Korean Peninsula and Japanese archipelago in the ancient history. First of all, as we analyzed documents such as Ilbonseogi (日本書紀) that described the exchange of traditional costumes between ancient Korea and Japan, we could understand that Japan inherited its culture of costumes from Baekje (百濟). Especially we could observe that culture of traditional costumes moved from Baekje to the Japanese archipelago at the same time as professional intellectuals were dispatched from Baekje during the war between Baekje (百濟) and Koguryo (高句麗) since the end of the 4th century. In addition, we could find out that the culture of traditional costumes in the ancient Japan was delivered and spread from the Yamato-aya clan (東漢氏) and the Hata clan (秦氏) whose ancestors are likely to move to the Japanese archipelago from Baekje according to literature reviews. Therefore, this study showed that the exchange of traditional costumes between ancient Korea and Japan described in documents was the cultural exchanges by the transmission of advanced traditional costumes from Baekje to Yamato Wa (倭) and the dispatch of professional intellectuals from Yamato Wa (倭) to Baekje.

부 - 모의 관계양식과 청소년의 문제행동

홍성화(Hong Sung Hwa) 한국정서행동장애학회 1991 정서ㆍ행동장애연구 Vol.7 No.1

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청대전기 강남지역 농촌 선방직업의 (線紡織業) 선대제 (先貸制) 생산에 대하여

홍성화(Sung Hwa Hong) 명청사학회 1998 명청사연구 Vol.9 No.1

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가속도 센서를 이용한 무선 센서 네트워크하에서의 위치 인식 알고리즘

홍성화(Hong, Sung-Hwa),정석용(Jung, Suk-Yong) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.4

노드들 모두가 움직이는 환경에서 센서 노드는 통신반경 안의 앵커 노드 위치정보를 수신 받아 자신이 이 동한 거리와 방향만큼 수신한 앵커 노드 위치정보를 수정하여 자신의 메모리에 저장하고, 3개 이상이 되면 삼변 측 량에 의해 localization을 수행하여 자신의 위치를 결정한다. 일정한 거리를 유지하고 노드들이 같은 방향으로 움직이 는 환경에서는 센서 노드가 1홉 범위에서 절대좌표를 가진 앵커 노드를 3개 이상 만날 확률이 적다. 만약 센서 노드 가 3개 이상의 비콘 정보로 자신의 위치를 추정하였다고 하여도 시간이 경과하면서 가속도기와 디지털 나침반의 각 θ오차가 지속적으로 적용되어 오차범위는 커지고 추정된 위치도 신뢰받지 못한다. Dead reckoning 기술은 GPS가 동작하지 않는 곳에서 보조적인 위치 추적 항법 기술로 사용되고 있는데 가속도 센서와 디지털 나침반으로 노드가 움직인 거리와 방향을 알면 자신의 위치를 추정할 수 있다. 위치 인식 알고리즘은 Dead reckoning 을 이용한 위치인 식 기법으로 모든 노드가 전방향성 안테나를 장착하고, 가속도기와 디지털 나침반으로 자신이 이동한 거리와 이동 방향을 알 수 있다고 가정한다. Matlab을 이용하여 시뮬레이션한 결과 다른 기법(MCL,DV-distance)들 보다 우수함을 증명하였다. In an environment where all nodes move, the sensor node receives anchor node's position information within communication radius and modifies the received anchor node's position information by one's traveled distance and direction in saving in one's memory, where if there at least 3, one's position is determined by performing localization through trilateration. The proposed localization mechanisms have been simulated in the Matlab. In an environment where certain distance is maintained and nodes move towards the same direction, the probability for the sensor node to meet at least 3 anchor nodes with absolute coordinates within 1 hub range is remote. Even if the sensor node has estimated its position with at least 3 beacon information, the angle θ error of accelerator and digital compass will continuously apply by the passage of time in enlarging the error tolerance and its estimated position not being relied. Dead reckoning technology is used as a supplementary position tracking navigation technology in places where GPS doesn't operate, where one's position can be estimated by knowing the distance and direction the node has traveled with acceleration sensor and digital compass. The localization algorithm to be explained is a localization technique that uses Dead reckoning where all nodes are loaded with omnidirectional antenna, and assumes that one's traveling distance and direction can be known with accelerator and digital compass. The simulation results show that our scheme performed better than other mechanisms (e.g. MCL, DV-distance)

영국요트보험약관에 있어서 요트보험자의 보상책임에 관한 해석론적 고찰

홍성화 ( Sung Hwa Hong ) 한국해법학회 2006 한국해법학회지 Vol.28 No.1

선박공제약관상의 감항성 담보조항의 문제점과 개선방안

홍성화 ( Sung Hwa Hong ) 한국해법학회 2008 한국해법학회지 Vol.30 No.1

Ship mutual insurance is the mutual insurance system which is applied to a member`s loss and damage in a marine accident of an entered ship. A member can get indemnity according to this ship mutual insurance clause which is standardized contractual terms. Korea Shipping Assurance started ship mutual insurance business and applied the same Institute Time Clause-Hulls as other Company Insurers did since 1963, but for the separate ship mutual insurance contract, ship mutual insurance clause in Korean was applied. Since 2000, Separate contracts has been increased, and the difference of the government law and scope of cover between the ITC-Hulls and the clause in Korean caused the scope of indemnity. For the same indemnity to the members and supply to ocean operating ships, the 1st revision was made in 2006 and has been applied since. Ship mutual insurance clause section 7.1, 7.2 and 7.3 seem to be modified and applied from the terms of MIA`s warranties. Especially the section 7.3 shows the ship seaworthy, saying that the maintaining of the ship seaworthy should be warranted, and if it is not kept, Korean Shipping Assurance is automatically discharged from liability. This seems very unreasonable to members of the contract. This paper will cover the problems and improvements of the section 7 Warranties following the question raised above.

AI를 활용한 AR/VR 스마트 양식 관리 시스템

홍성화(Sung-Hwa Hong) 한국정보통신학회 2019 한국정보통신학회 종합학술대회 논문집 Vol.23 No.2

제주지역 특급호텔 종사원의 직무스트레스와 조직유효성에 관한 연구

홍성화(Hong Sung Hwa),장성수(Jang Sung Soo),송재호(Song Jae Ho) 제주대학교 관광과경영경제연구소 2008 産經論集 Vol.23 No.-

수상레저기구보험에 관한 일고찰

홍성화(Sung-Hwa Hong) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-

The previous Water Leisure Safety Act that has been reformed in March 2005 obliges only a marine leisure business proprietor to insure compulsory liability insurance for the victims out of the operation of water leisure craft for business purposes, even though it does not provide any provisions for the protection of the victims out of the operation of water leisure craft for personal purposes. Hence the previous Water Leisure Safety Act has been reformed in March 2005 to protect the victims out of the operation of water leisure craft for personal purposes by means of obliging the private proprietor of water leisure craft to insure compulsory liability insurance, and to be effective from April 1st, 2006. Therefore, this paper examines the concept of water leisure craft for personal purposes, the utility and significance of liability insurance, and the principal contents of the liability insurances for water leisure craft for personal purposes that are currently used in UK and Japan, and inspects their problems and remedies.