http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
서동남(D.N. Seo),엄유식(Y.S. Um),박경만(K.M. Park),이상재(S.J. Lee),김대훈(D.H. Kim),권영철(Y.C. Kwon) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
In the present study, the cooling performances of the air-conditioner applied the fin-tube and aluminum PF heat exchangers have been experimentally investigated by using the calorimeter. The experiment is carried out in the conditions of the standard temperature and the low temperature. Fin type of PF heat exchanger is a triangler and squarer form. PF heat exchanger has smaller refrigerant weight and larger capacity and COP than the fin-tube heat exchanger. The performance of PF-2 heat exchanger with the squarer fin is more excellent than that of PF-1 heat exchanger with the triangler fin. The high pressure of PF heat exchanger decreases about 7%, compared to the fin-tube heat exchanger. Also, CSPF of the fin-tube and PF heat exchanger is evaluated.
지반굴착에 소요되는 전기식모터의 전류저항값 변화에 관한 연구
서동남 ( Seo Dong-nam ),정상훈 ( Jeong Sang-hoon ),이상현 ( Lee Sang-hyun ),신진섭 ( Shin Jin-seob ),최상호 ( Choi Sang-ho ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
In this application study, field pilot tests were performed to evaluate the validity of a proposed formula between the exerted electrical energy and SPT N-value based on the result of the basic study. Measurement sensors and recording system were developed to obtain exerted motor current and drilling depth in a field. By using the correlation formula proposed in the basic study, the measured motor current and boring speed were applied to predict SPT N-value and the predicted N-values were compared to SPT N-value of site exploration. From the comparisons it is verified that the exerted electrical energy to bore ground might be used to predict SPT N-value and pile tip location.
서동남 ( Seo¸ Dong-nam ),최상호 ( Choi¸ Sang-ho ),김진식 ( Kim¸ Jin-sik ),김민갑 ( Kim Min-kab ),이동현 ( Lee¸ Dong-hyeon ),조성준 ( Cho¸ Seong-jun ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
inside the piles, and confirmed whether the piles were cracked through a field test simulating the construction conditions in which water pressure inside the piles was generated by a hammer. According to the construction case, under the construction condition where the pile length is 20% to 30% shorter than the drilled length, about 80% cracks occur, so there is a high possibility of cracking due to water inside the pile. A field test was conducted to confirm the type of pile failure due to hammer under the construction condition in which water exists inside the pile. The pile head was not destroyed by the compressive load, and one or more longitudinal cracks occurred along the PC steel wire. The closed end pile generates water pressure by hammer. the follower and cushion(compression plywood) must be drilled at least 0.4D. It is expected that improved quality control will be possible as the water pressure inside the pile is reduced.
서동남 ( Seo Dong-nam ),최상호 ( Choi Sang-ho ),김진식 ( Kim Jin-sik ),김성철 ( Kim Seong-cheol ),이동현 ( Lee Dong-hyeon ),조성준 ( Cho Seong-jun ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.2
The equation of end bearing capacity is applied differently depending on the type of pile, construction method, and load characteristics considering the construction standards. The bearing capacity equation of the design standard is presented in various ways according to the design conditions such as construction method and ground condition, etc. but, It does not reflect the ground strength according to the SPT-N value of weathered rock. This study analyzed the trend of allowable tip bearing capacity by pile diameter through about 480 dynamic loading tests conducted for the construction/quality management of piles for the last 6 years since 2015. The equation for the ultimate end bearing capacity per unit area according to the SPT-N value is presented. The proposed formula of ultimate end bearing capacity per unit area can be applied in the range of 15,000kN/m2 to 30,000kN/m2. The proposed formula, which complements the existing formula, enables pile design and construction/quality management.
연결패턴 정보 분석을 통한 온라인 게임 내 불량사용자 그룹 탐지에 관한 연구
서동남(Dongnam Seo),우지영(Jiyoung Woo),우경문(Kyung-moon Woo),김종권(Chong-Kwon Kim),김휘강(Huy Kang Kim) 한국정보보호학회 2012 정보보호학회논문지 Vol.22 No.3
온라인 게임 산업이 성장함에 따라 온라인 게임 보안 이슈는 증가하고 있다. 특히 게임내의 사이버재화를 현금으로 바꾸는 행위인 현금거래(RMT ; Real Money Trade)는 탈세나 돈세탁등과 같은 실물경제의 범죄활동과 연관되면서 국내를 비롯한 여러 나라에서 민감한 문제로 떠오르고 있다. 이러한 현금거래는 작업장이라고 불리는 전문적인 불량사용자 조직에 의해 이루어진다. 온라인 게임 사업자들은 이러한 작업장을 탐지하기 위하여 bot탐지 알고리즘을 이용해 각각의 bot 사용자를 탐지하고 그들의 계정과 IP주소를 차단하고 있다. 하지만 bot탐지 알고리즘은 작업장의 일부분만 탐지가 가능하여 큰 효과를 거두기 어렵고, IP 주소 차단역시 IP변조나 가상 사설망 기술을 이용하여 쉽게 우회 가능하다는 점을 가진다. 보 논문에서는 온라인 게임 서비스를 이용하는 사용자들의 연결 패턴 정보에 테이터마이닝 기법을 적용하여, 작업장 그룹 내 불량 용자 군집을 탐지할 수 있는 모델을 제안한다 제안한 모델을 활용하여 IP변조나 VPN기술을 통한 우회접속 역시 탐지 할 수 있다. 국내 최대 온라인 게임의 데이터를 샘플로 하여 수행결과를 도출하였고, 본 논문에서 제시한 기법을 이용한 결과를 실제 차단리스트와 비교하여 본 결과, 효율적으로 작업장을 탐지해 낼 수 있음을 확인 할 수 있었다. Security issues in online games are increasing as the online game industry grows. Rel money Trading (RMT) by online game users has become a security issue in several issue in several countries including Korea because RMT is related to criminal activities such as money laundering or tax evasion. RMT-related activities are done by professional work forces, namely gold-farmers, and many of them employ the automated program, bot, to gain cyber asset in a quick and efficient way. Online game companies try to prevent the activities of gold-farmers using game bots detection algorithm and block their accounts or IP addresses. However, game bot detection algorithm can detect a part of gold-farmer’s network and IP address blocking also can be detoured easily by using the virtual private server or IP spoofing. In this paper, we pro pose a method to detect gold-farmer groups by analyzing their connection patterns to the online game servers, particularly information on their routing and source locations. We verified that the proposed method can reveal gold-farmers’ group effectively by analyzing real data from the famous MMORPG.
관측 불가능한 환경효과를 고려한 시스템의 수명자료분석을 위한 모형개발
박희창(Hee-Chang Park),남기성(Ki-Seong Nam),서동암(Dong-Am Seo),이석훈(Suk-Hoon Le) 한국자료분석학회 2000 Journal of the Korean Data Analysis Society Vol.2 No.3
본 논문에서는 관측불가능한 환경효과를 고려한 수리가능한 시스템의 수명과 고장발생횟수간의 결합모형을 개발하여 모형의 특성을 파악하고, 모형에 포함된 모수의 추론과정을 살펴보고자 한다. 환경효과를 나타내는 분포를 감마분포로 가정하고 시스템의 수명은 와이블분포를 가정하였으며, 고장발생횟수는 포아송분포를 따르는 것으로 가정하였다. 개발된 모형을 모의실험을 통해 얻어진 자료에 적용하는 동시에 환경효과를 고려한 모형과 이를 고려하지 않은 독립모형과의 비교를 통하여 환경효과의 영향을 고찰하였다. 또한 개발된 모형의 특성을 파악하기 위해 시스템의 수명과 고장발생횟수의 변화에 따른 여러 가지 확률의 변화하는 양상을 고찰하였다. In this paper we consider the problem of modeling count data where the observation period is determined by the life time of the repairable system under study. We assume an individual gamma frailty model to allow for unobservable environment effects. We assume that, given a random effect or a frailty, the death times follow a Weibull distribution with a hazard rate. For the counts, given a frailty, a Poisson process is assumed with the intensity depending on time. A model for the time to death and the number of failures system received is constructed and consequences of the model are examined.
엄유식(Y.S. Um),서동남(D.N. Seo),박경만(K.M. Park),이상재(S.J. Lee),김대훈(D.H. Kim),권영철(Y.C. Kwon) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
In the present study, the air-side heat transfer and pressure drop characteristics of the fin-tube and PF heat exchangers have been experimentally investigated under the cooling standard condition. Fin type of PF heat exchanger is a triangler and squarer form. The experimental data of the slit fin-tube and two kinds of PF heat exchangers are measured using the air-enthalpy calorimeter and the constant temperature water bath. As the inlet air velocity increases, the heat transfer rate and pressure drop of the heat exchanger increased. The heat transfer rate and pressure drop of PF-2 heat exchanger of the squarer fin is larger than that of PF-1 heat exchanger of the triangler fin. As the inlet air temperature increases, the heat transfer rate decreases and the pressure drop is nearly uniform.
온라인게임 서비스 분야에 정보보호 사전진단 적용시 효과성에 관한 연구
유동영(Dong-Young Yoo),서동남(Dong-Nam Seo),김휘강(Huy Kang Kim),최진영(Jin Young Choi) 한국IT서비스학회 2011 한국IT서비스학회지 Vol.10 No.2
The preliminary security assessment is an information security process to analyze security weaknesses before beginning of services. Discovering security weakness through preliminary security assessment is highly required because it costs much when security incident occur in the middle of service operation. However, this assessment is not widely spread in the online game service domain yet. In this paper, we summarize the security risk existed in the online game service, and we classify the security requirements related to the each risk. Also, through the case study, we evaluated the effectiveness of preliminary security assessment ín this domain. In addition, we suggest checklists that should be reviewed once in game-client side, network-side and game-server síde for the purpose of security enhancement.
권영철(Kwon, Young-Chul),전종균(Chun, C.K.),박윤창(Park, Youn-Chang),고국원(Ko, Kuk-Won),서동남(Seo, Dong-Nam) 한국산학기술학회 2008 한국산학기술학회논문지 Vol.9 No.6
본 연구에서는 인버터 압축기를 적용한 3실형 멀티-열펌프 시스템의 냉방운전 시 시스템의 성능특성을 조사 하였다. 시스템의 운전특성은 항온항습 기능을 가진 공기엔탈피방식의 칼로리미터를 이용하여 측정되었으며, 냉방표준 및 냉방저온 온도조건에서 실내기 조합에 따른 실험이 수행되었다. 3실형 열펌프의 실내기 조합운전에 따른 냉방 표준운전 및 냉방저온운전 시의 냉방능력, COP, P-h선도로부터, 3실형 열펌프의 운전특성과 냉방사이클의 거동을 이해하였다. 열펌프의 운전부하와 성능은 실내기 조합에 의존하므로 시스템의 능력과 사이클의 거통은 다르게 관찰되었다. 과냉도 증가와 압축일의 감소로 표준조건보다 저온조건에서 냉방능력과 COP가 더 높았다. 또한 P-h 선도를 이용 하여 사이클의 운전특성도 분석하였다. In order to investigate the cooling capacity of multi-heat pump applying an inverter compressor, the experiment on the cooling performance characteristics of heat pump with 3 indoor units was performed under the cooling standard and cooling low-temperature conditions. The system data were measured by the psychrometric calorimeter. The operation characteristics and the behavior of the cooling cycle of the heat pump with 3 indoor units were understood from the cooling capacity, COP, and P-h diagram by indoor-unit combination. The operating load and performance of the multi-heat pump depends on the indoor-unit combination. The cooling capacity and COP of the low temperature condition were larger than those of the standard one. Also the cycle was analyzed by using P-h diagram.