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윤종성(JUNG-SUNG YOON),김명규(MYOUNG-KYU KIM),정광효(KWANG-HYO JUNG),김가야(GA-YA KIM) 한국해양공학회 2008 韓國海洋工學會誌 Vol.22 No.3
In this study, flow and creation and dissipation of vorticity around rectangular floating breakwater is investigated both experimentally and numerically. The PIV system(Particle image velocimetry) is employed to obtain the velocity field in the vorticity of rectangular structure. The numerical model, combined with k-ε turbulence model and the VOF method based on RANS equation, is used to analyze the turbulence structure. In the results of this study, the vorticity is found around conner of rectangular structure at all time domain, and creation and dissipation of vorticity are closely related to wave period. Separation points of phase of vortex due to flaw separation for longer period waves are faster then for shorter period waves.
윤종성(Jong-Seong Yoon),정두원(Doo-Won Jung),강철훈(Chul-hoon Kang),이상진(Sang-Jin Lee) 한국정보보호학회 2014 정보보호학회논문지 Vol.24 No.1
최근 데이터의 대용량화로 인해 관계형 데이터베이스 관리 시스템(RDBMS)과 빅데이터 처리를 위한 NoSQL DBMS에 대한 수요가 꾸준히 늘고 있다. 관계형 DBMS에 대한 디지털 포렌식 조사 기법은 활발히 연구되어 왔으나 최근 사용이 급증하고 있는 NoSQL DBMS에 대한 포렌식 조사 기법에 대한 연구는 거의 없는 실정이다. 본 논문에서는 NoSQL DBMS 중 가장 많이 사용되고 있는 MongoDB에 대한 디지털 포렌식 조사 절차와 기법을 제안한다. As the data gets bigger recently, the demand for relational database management system (RDBMS) and NoSQL DBMS to process big data has been increased consistently. The digital forensic investigation method for RDBMS has been studied actively, but that for NoSQL DBMS, which is popularly used nowadays, has almost no research. This paper proposes the digital forensic investigation process and method for MongoDB, the most popularly used among NoSQL DBMS.
해역에서의 지형성 저열효과를 고려한 성층유동 수치모델에 관한 연구
윤종성(JUNG-SUNG YOON),김명규(MYOUNG-KYU KIM),한동진(DONG-JING HAN),김가야(GA-YA KIM) 한국해양공학회 2008 韓國海洋工學會誌 Vol.22 No.5
In Jinhae-Masan bay, a typical semi-closed bay in Korea, the water quality is severely deteriorated because of the closed topographic character and the inflow of nutrients from the land. There have been attempts to apply a water quality model dealing with the entrophication phenomenon and the oxygen-deficient mass in the bay in summer, but there have been fow examples of models that have considered the phenomenon of stratification in the proper order, and then it is performed the model of water quality. Therefore, this study collected and analyzed the pre-observed water temperature data from Jinhae-Masan bay in summer and then constructed a density model using the topographic heat accumulation effect and inflow from the river to examine the temperature stratification. The simulation results shaw that this model could demonstrate the temperature stratification in the Jinhae-Masan bay very well.
윤종성 ( Jong-seong Yoon ),정두원 ( Doo-won Jung ),이상진 ( Sang-jin Lee ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.2
최근 데이터의 대용량화와 급격한 증가로 인해 빅데이터 처리를 위한 NoSQL DBMS 사용이 증가하고 있다. 그러나 기존 관계형 DBMS에 비해 NoSQL DBMS에 대한 포렌식 조사 기법에 대한 연구는 거의 없는 실적이다. 따라서, 본 논문에서는 NoSQL DBMS 중 가장 활발히 사용되고 있는 MongoDB에 대한 디지털 포렌식 조사 절차와 기법에 대해 연구하였다.
연안 지역에서의 통합적인 방재대책 구축을 위한 토석류 모델 개발
김연중(Yeon-Joong Kim),윤종성(Jung-Sung Yoon),Nakagawa Hajime,우선봉(Sun-Bong Woo) 한국연안방재학회 2014 한국연안방재학회지 Vol.1 No.4
The characteristics of natural disasters have become increasingly more difficult to predict due to the influence of climate change. In addition, the multi-environment zones (i.e., with various geographical risk factors) have very high potential disaster risks. Multiple debris flow disasters between mountainous areas and coastal, urban areas have occurred simultaneously with flooding disasters caused by heavy, torrential rainfall due to the changing global climate and environment. Preventing the occurrence of disasters with structural and non-structural measures is the most basic approach to disaster prevention. However, in order to mitigate these disasters more effectively, it is necessary to investigate what causes damage and establish a disaster prevention countermeasure according to the integrated system for a several disasters. Therefore, the aims of this study are to estimate the characteristic of debris flow at the fan area, and to establish an integrated plan for preventing disasters by develop an applicable debris flow model for an actual basin. To validate the developed 2-D numerical model, the results of hydraulic model test are compared with the results of the numerical calculation. The parameters of total flow and sediment discharges, sediment concentration, flow pattern, and travel length are measured in hydraulic experiment and used to validate the numerical model. As a result, the simulated results are in good agreement with the experimental results.
남강댐방류에 따른 부유쓰레기의 거동 및 담수확산에 관한 연구
김연중(Yeon Joong Kim),윤종성(Jung Sung Yoon) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.2
Typhoon Rusa in 2002 was recorded as causing the biggest damage due to flood in our country. With the enormous damage to the land, the flood was totally discharged to the open sea. As a result, in the coastal area, the discharging of a river had a big influence in compariosn to the scale of the coastal area, which suffered damaged due to the discharging of the river. As it cleared the land, the load was totally discharging into the sea, where it caused various problems due to its influence on the ecosystem. These included chnges to the environment, like a diffrence in salinity and the inflow of a land load. Therefore, in this study, a Lagrangian particle tracking model was constructed using a flow model capable of solving the behavior of a river plume, supposing Sachon Bay. It is performed the research ablie to tendency-like valuation and reappearance about real event. The result was that the model was well approximated the sea area tendency and the river plume of the specific event.
생태계 모델을 이용한 진해ㆍ마산만에서의 빈산소수괴의 형성 및 발달에 관한 연구
김연중(Yeon Joong Kim),김명규(Myoung Kyu Kim),윤종성(Jung Sung Yoon) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.6
This study established a 3D ecosystem model composed if stratification considering the topographic heat accumulation effect and river outflow, and then applied this model to Jinhae, Masan Bay. Specifically, it reenacted the formation and developmental process if ODW according to the stratification by calculating the kinematic eddy viscosity and eddy diffusion coefficient of the stratification model. The results were used as input data for the ecosystem model and compared with DO, COD, I-N, and I-P, which is the standard index of ocean water quality. As a result, it was determined that COD and T-N are third grade and T-P is second grade standards for a natural environment.