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밀폐계 가연성 목재분진의 폭발에너지와 산소소모율에 관한 연구 - Part I: 폭발에너지의 정량화 및 폭발효율
김윤석,이민철,이근원,이동호,Kim, Yun Seok,Lee, Min Chul,Lee, Keun Won,Rie, Dong Ho 한국안전학회 2016 한국안전학회지 Vol.31 No.4
A dust explosion is a phenomenon of strong blast wave propagation involving destruction which results from dust pyrolysis and rapid oxidation in a confined space. There has been some research done to find individual explosion characteristics and common physical laws for various dust types. However, there has been insufficient number of studies related to the heat of combustion of materials and the oxygen consumption energy about materials in respect of dust explosion characteristics. The present study focuses on the relationship between dust explosion characteristics of wood dust samples and oxygen consumption energy. Since it is difficult to estimate the weight of suspended dust participating in explosions in dust explosion and mixtures are in fuel-rich conditions concentrations with equivalent ratios exceeding 1, methods for estimating explosion overpressure by applying oxygen consumption energy based on unit volume air at standard atmospheric pressure and temperature are proposed. In this study an oxygen consumption energy model for dust explosion is developed, and by applying this model to TNT equivalent model, initial explosion efficiency was calculated by comparing the results of standardized dust explosion experiments.
김윤석,진용옥,Kim, Yun-Seok,Chin, Yong-Ohk 한국정보처리학회 2000 정보처리논문지 Vol.7 No.10
본 논문은 ATM망의 통화유랑 제어중 최적한 폭주제어의 실현을 위해 필수적인 다중매체 통화유량 예측에 관한 논문으로서 ATM망에 유입 될 다중매체 통화유량의 특성이 시대의 발전에 따라 서서히 변화될 것이 예상되므로 모의실험에 사용 될 다중매체 통화유랑을 단위시간당 접속호수는 프아송분포, 각 호당 요구전송속도는 감마분포, 각 호의 유지시간은 지수분포를 기준으로 하여 각각의 분포특성을 변화시켜 통화유량 특성변화를 유도하여 발생시킨 후 이를 신경망과 실시간 처리를 위해 제안된 3중신경망 모델[3]로 추정하여 비교함으로써 제안된 모델이 ATM망의 통화유량 예측에 이용될 수 있음을 보인다. this paper is a stucy onthe preductionof multi-media traffic flow for the realizationof optimum ATM congestion control. In ATM network it is expected that the characteristic of multi-media traffic flow is varied slowly with a time. Fjor the simulation, time-variable multi-media traffic is penerated using possion distribution(connect calls per process time).\, gamma distribution(transmission rate per a call) and exponential distribution(holding time per a call). And using back-propagation neural netwok and proposed tripple neural network, the simulation to predict generaed traffic is executed. From the result,it's capability is shown that the proposed neural network model can be used in the predictionof ATM traffic flow.
김윤석(Yun Seok Kim),김대연(Dae Yun Kim),남소현(So Hyun Nam),김성철(Seong Chul Kim),김인구(In Gu Kim) 한국간담췌외과학회 2009 한국간담췌외과학회지 Vol.13 No.2
Purpose: Mesenchymal hamartoma of the liver (MHL) is an uncommon benign disease of childhood, yet its biology and pathogenesis are still unknown. It is difficult to diagnose from other hepatic tumors, and malignant transformation can occur. It has caused a debate regarding choice of the proper management of each neoplasm of liver in childhood. Methods: We analyzed histologically confirmed MHLs from 1998 to 2008. Results: Six patients presented at a median age of 21months, with a painless abdominal mass. Gastrointestinal symptoms were present in two patients. Abdominal ultrasonography and CT scans revealed a cystic, septated mass within the liver in all patients. Three patients underwent major hepatic resections, one had a simple excision of the tumor, and two were observed after biopsy. The median follow up period was 46months (range 6-115months), and there were neither recurrences of tumors nor complications, in patients who underwent surgical treatment. Conclusion: Resectable mesenchymal hamartoma of the liver in childhood with normal liver function studies can be cured by complete excision without complications and without recurrence.