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Interject: 802.11기반 다중 홉 네트워크상의 협동적인 MAC 재전송 기법
서현덕(Hyundoc Seo),윤상기(Sangki Yun),민주홍(Juhong Min),문현선(Hyunsun Moon),김효곤(Hyogon Kim) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.6
Recently, co-operative transmission have gained much attention. In IEEE 802.11 network, wireless transmission intended for a particular destination node can be overheard by other neighbor node. We consider a novel method that is orthogonal to the existing approaches. Instead of following a single routed path, the transmission on each hop is broadcast, where a node farthest in the direction of the destination forwards it. In our proposed scheme, we let an intermediate node interject the frame that is considered to have been lost. the intermediate node transmits the lost frame, quickly resolving the transmission failure. Simulation experiments show that Interject significantly increases network capacity compared to existing algorithm.
공동불법행위자를 피보험자로 하는 책임보험자의 구상권 내용과 행사범위
서현덕(Seo Hyun Duk) 한국보험법학회 2016 보험법연구 Vol.10 No.2
대법원 판례에 따를 때, 공동불법행위자의 책임보험자는 피보험자가 공동불법행위자일 경우 피해자에게 보험금을 지급하고 다른 공동불법행위자에게 구상권을 행사할 수 있다(대법원 1994. 10. 7. 선고, 94다11071 판결). 여기서 책임보험자가 다른 공동불법행위자에게 행사하는 구상권의 실질적인 내용은 민법상 연대채무를 지는 자가 자신의 부담부분을 초과 변제한 뒤에 공동면책된 한도 내에서 다른 연대채무자에게 행사할 수 있는 구상권을 대신 행사하는 것으로 볼 수 있다. 공동불법행위자 중 일인의 책임보험자가 다른 공동불법행위자에게 보험자 대위에 따른 구상금 청구를 하는 경우 구상금 청구를 당하는 공동불법행위자에게도 책임보험자가 있을 수 있고, 이러한 경우 먼저 피해자에게 보험금을 지급한 책임보험자는 다른 공동불법행위자의 책임보험자에게도 그 부담부분 한도 내에서 상법상 직접청구권을 행사할 수 있는 것 또한 기존 판례에서 인정되었던 바 있다(대법원 1998. 9. 18. 선고 96다19765 판결 등). 그런데 보험금을 지급하고 다른 공동불법행위자의 책임보험자에게 구상권을 행사하는 보험자가 그 다른 공동불법행위자의 책임보험자이기도 한 경우, 즉 공동불법행위자를 공동피보험자로 하는 책임보험자가 그 중 일부만을 피보험자로 하는 책임보험자를 상대로 구상권을 행사할 경우 그 내용을 어떻게 정할 것인가가 문제될 수 있다. 여기서는 공동불법행위자의 어떤 책임보험자가 먼저 보험금을 지급하였는지 여부와 무관하게 동일한 결론이 도출될 수 있도록 해야 하며, 추가적인 소송 발생에 따른 소송경제상의 불합리를 방지하는 해결방안이 중요하다고 할 수 있다. 이를 위해 공동불법행위자 상호간의 과실비율에 따른 책임보험자간의 분담분에서 책임보험자간의 중복보험 처리에 따른 안분부담분을 산입하여 그 구체적 구상금 액수를 산정하는 것이 필요할 것으로 판단된다. 대법원 2014다42202 판결은 그 표현상에 약간의 오해의 소지는 있으나 이를 적절히 지적하여 타당한 결론을 내린 것으로 생각된다. According to the Supreme Court of Korea, insurer of liability insurance of one joint tort-feasor could make a claim for reimbursement to another joint tort-feasor right after compensate the victim(Supreme Court 1994. 10. 7. 94Da11071). In other words, the actual meaning of reimbursement which liability insurer made a claim to another joint tort-feasor is that one of the joint debtor could make a claim reimbursement to another when he repay debt by more than his portion of liability under a joint obligation principle used in civil case. If the liability insurer of one joint tort-feasor make a claim for reimbursement to another based on the insurance subrogation, the joint tort-feasor who was claimed recompense could also have insurer of libility insurance, and under the Supreme Court of Korea, the insurer of liability insurance which compensate the victim first could make a claim to another joint tort-feasor’s liability insurer using by the third parties direct rights against insurer(Supreme Court 1998. 9. 18. 96Da197651 ect.). In that case, if the insurer which makes direct claim to another joint tort-feasor’s liability insurer, which has only one joint tort-feasor as a insured, is also a liability insurer of that joint tort-feasor, that is claim making liability insurer has both joint tort-feasor as a insurant, it is the matter how can we estimate and assess the range of that reimbursement. The answer of this matter requires that it must be arrive the same conclusions regardless which liability insurer pays first, and it can preserve economics of procedure preventing irrational extra lawsuit. In this regard, it is necessary to include calculated division amount resulted from process of double insurance in each liability insurer’s share of obligation coming from joint tort-feasor’s mutual fault ratio. As properly point these out, the decision of Supreme Court 2014Da42202 is thought to have reached reasonable conclusion although it has somewhat misleading to say.
이젝터를 이용한 효율적인 공기방울 장벽 형성에 관한 연구
서현덕(Hyeon Deok Seo),Aliyu M. Aliyu,김경천(Kyung Chun Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Bubble velocity and diameter in the water tank were experimentally studied with using a high-speed camera. Experiment was implemented with 3 cases, no ejector, two different configurations of ejector with 0 and 1.5 D (mixing section diameter) gaps between the nozzle exit and the ejector neck. Images were handled with MATLAB Image Processing tools and statistical methods. Bubble properties were analyzed with respect to the range of Reynolds number. At low Reynolds number case, the ejector acts as an obstacle. In the case of high Reynolds number larger than 21,100, the zero gap ejector shows the potential to produce smaller bubbles than the ‘no ejector’ case.
공기구동 이젝터를 이용한 ABB (Air Bubble Barrier)의 기포거동 특성 연구 (Ⅱ)
서현덕(Hyunduk Seo),알리유 무사 알리유(Aliyu Musa Aliyu),김효근(Hyogeum Kim),김경천(Kyung Chun Kim) 한국가시화정보학회 2017 한국가시화정보학회지 Vol.15 No.2
To verify floatability of ABB (Air bubble barrier), we compared bubble swarm behavior with and without the air-driven ejector. Experiment was conducted using the fabricated air-driven ejector with 5 mm nozzle on the bottom of 1 m3 water tank. Reynolds number of air in the nozzle was ranged 1766-13248. We analyzed data with statistical method using image processing, particle mage velocimetry (PIV) and proper orthogonal decomposition (POD) analysis. As a result of POD analysis, there was no significant eigenmode in bubbly flow generated from the ejector. It means that more complex turbulent flows were formed by the ejector, thereby (1) making bubbles finer, (2) promoting three-dimensional energy transfer between bubble and water, and (3) making evenly distributed velocity profile of water. It is concluded that the air-driven ejector could enhance the performance of ABB.
서현덕 ( Hyun Deok Seo ),나찬호 ( Chan Ho Na ),정병수 ( Byoung Soo Chung ),최규철 ( Kyu Cherl Choi ),신봉석 ( Bong Seok Shin ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.4
Pyoderma gangrenosum is a painful, chronic, ulcerating skin disease associated with a wide variety of disorders, including Crohn`s disease, ulcerative colitis, and Behcet`s disease. Etiology of pyoderma gangrenosum is unknown but the lesions frequently appear at points of trauma and it is related with pathergy. We report a case of post-traumatic pyoderma gangrenosum occurring in ulcerative colitis with a review of the literature. (Korean J Dermatol 2008;46(4):487~490)