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허진석(JinSeok Heo),임성진(SungJin Lim),채용배(YongBae Chae),임현호(HyeonHo Lim),이상호(SangHo Lee) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
Numerical analysis was performed to analyze the vibration characteristics of blade system in a road mower head. Rotating shaft with the blades show the bending and twisting mode shape because blades are overally arranged in an asymmetric structure. The maximum frequency is approximately 17.9 Hz at 10th, and the maximum deformation occurred is about 25.9 mm at 9th at 17.5 Hz. The cross points of the excitation and natural frequencies were predicted through Campbell diagram while critical speed of system is relatively lower. This analysis results can be used as basic data for optimal mower head system design.
패치탐사 효율성 증대를 위한 컨텍스트 및 수정패턴에 대한 분석
허진석(Jinseok Heo),정호현(Hohyeon Jeong),이은석(Eunseok Lee) 한국정보과학회 2020 정보과학회 컴퓨팅의 실제 논문지 Vol.26 No.12
프로그램 자동 수정 기법의 한 종류인 탐사기반 프로그램 자동 수정 기법의 경우 탐사 영역에 따라 개발자가 수용할 수 있는 패치인 옳은 패치의 생성 효율이 영향을 받는다. 이에 따라 효율적인 영역탐사를 위해 소스 코드의 구조적 정보를 활용한 연구가 진행되었다. 하지만 구조적 정보의 추상화 정도에 따라 연결된 수정패턴이 많아지면 탐사 효율 및 옳은 패치 생성률 저하를 야기할 수 있다. 본 논문에서는 옳은 패치 생성 효율 측면에서 패치 전 코드의 구조적 정보와 코드 수정패턴 간의 상관관계를 분석한다. 패치 전 코드의 구조적 정보를 담은 컨텍스트 별로 코드 수정패턴의 그룹화를 분석했을 때, 9개 오픈소스 프로젝트에서 수집한 470개 컨텍스트 중 19.02%가 2개 이상의 컨텍스트로 추가 분할될 수 있음을 확인하였다. 결과적으로 분할된 컨텍스트들을 통해 수정패턴을 분산시킴으로써 탐사영역을 축소할 수 있어 탐사효율 증대의 가능성을 확인하였다. In search-based Automated Program Repair(APR), correct patch generation efficiency is impacted by the search space. Thus, research using the context of source code has been conducted in order o establish an area for efficient search. However, if the number of connected change patterns increases according to the degree of abstraction of the context, it may cause decreasing efficiency and impede the correct patch generation rate. In this paper, we analyze the correlation between the context and change patterns in terms of the correct patch generation efficiency. When analyzing the grouping of code change patterns by context, it was confirmed that 19.02% of the 470 contexts collected from nine open source projects could be further classified into two or more sub-contexts. As a result, it was possible to reduce the search space by dispersing the change pattern through the classified contexts, confirming the possibility of increasing the exploration efficiency.
채용배(YongBae Chae),허진석(JinSeok Heo),임성진(SungJin Lim),이상호(SangHo Lee) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
Seawater flow characteristics around deep-sea sediment resuspension system was investigated through CFD simulation in constant flow field. Seawater flow field is largely affected by the resuspension system with disturbance device. Especially, turbulent kinetic energy gradually decreases along the flow direction. It is also predicted that discharged flow in vertical direction affects rather larger and its effect reaches far downstream. The results of this study are expected to be useful in evaluating the effect of the suspended solid matter which is generated in the deep sea sediment disturbance process.
Clinical Features of Neuroendocrine Carcinoma of the Gallbladder
( Choi Dong Wook ),( Heo Jinseok ),( Choi Seong Ho ),( Han In Woong ),( You Yung Hun ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: Gallbladder neuroendocrine tumors (GB-NETs) are very rare disease. Among these, clinical features of GB neuroendocrine carcinoma (GB-NEC) was little known in previous studies. We analyzed clinicopathologic features of GB neuroendocrine carcinoma, clinical outcome and risk factors for survival. Methods: From October 1994 to December 2014, the medical records of 31 patients who were diagnosed with GB NEC in Samsung Medical Center were prospectively collected and retrospectively reviewed. We found 13 GB NEC cases out of 582 surgically resected GBC (GB carcinoma)s. Patients with age,sex and stage-matched GBC were selected (1:3) for comparative analysis of the clinicopathologic features and survival of GB NET. Results: From October 1994 to December 2014, the medical records of 31 patients who were diagnosed with GB NEC in Samsung Medical Center were prospectively collected and retrospectively reviewed. We found 13 GB NEC cases out of 582 surgically resected GBC (GB carcinoma)s. Patients with age,sex and stage-matched GBC were selected (1:3) for comparative analysis of the clinicopathologic features and survival of GB NET. Conclusions: GB NEC represented aggressive biologic behavior and high rate of recurrence compared to ordinary GBC. Although prognosis of GB NEC was bad, we could conclude operation including extended cholecystectomy is the best option for treatment. More studies will be needed to make a strategy for treatment and improve survival outcomes.