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골재크기 및 섬유혼입률에 따른 강섬유 보강 콘크리트의 휨 성능
장석준,안경림,윤현도,Jang, Seok-Joon,Ahn, Kyung-Lim,Yun, Hyun-Do 大韓建築學會 2015 大韓建築學會論文集 : 構造系 Vol.31 No.2
This paper describes the effect of aggregate size and fiber volume fraction on flexural properties of steel fiber reinforced concrete(SFRC) with specified compressive strength of 60 MPa. Maximum aggregate size used was 8 and 20mm, and steel fiber volume fraction was 0, 0.5, 1, 1.5, 2% in volume basis, in this study. Flexural properties studied include first-crack strength, flexural strength and toughness index of hardened SFRC. For this purposes, three prisms ($100{\times}100{\times}400mm$) form each mixture were made and tested under four points bending on the span length 300 mm. Test results indicated that flexural strength and toughness of SFRC were improved with increasing the volume fraction. Especially, specimens with aggregate size of 8mm were reported higher improvement in flexural toughness index than those with 20mm. This phenomenon are remarkable that fiber dispersion is improved with smaller aggregate size. Also the optimum volume fraction of SFRC was presented for that with 1.5% volume fraction. Based on test results and available literatures, flexural strength prediction model was established from compressive strength, volume fraction and aspect ratio of steel fiber. The model existed a good correlation between measured data.
장석준 ( Seok Joon Jang ),장문준 ( Moon Joon Jang ),이한식 ( Hahn Shick Lee ) 대한응급의학회 1992 대한응급의학회지 Vol.3 No.1
The overcrowding and congestion of a university hospitals emergency department is not only from shortage of admission room but from multiple factors. This kind of phenomenon restrict quality and property of treatment of emergency department patients. Once patient visit emergency departrnent, patient goes through a physical and laboratory examinations, then decided whether patient could be either admit or discharge from emergency department or transfer to other hospitals. In a course of process many factors can delay a medical examination and treatrnent of emergency department patient. Therefore overcrowding and congestion of emergency department is growing from bad to worse. In this article, by analyze the time required for emergency departrnent patient to go through a process from initial arrival to leave emergency department. Aut,hors made an analysis and present with following suggestions for improvement in an emergency department. We investigated factors for delay of examination and treatment in emergency departrnent, therefore, causing overcrowding phenomenon, for 4, 194 patients visited Young Dong Severance Hospital emergency department from September 1st, 1991 to October 31th, 1991. The results were as follows : 1) Distribution of department was Internal medicine, Emergency department and Pediatrics in order. 2) In 24 hour period, 1,546(36.9%) patients visited during evening hours. For 3,426 patients, 90 % of them spent less than 10 minutes for receipt. 3) In time interval between receipt and notification to each department, 42.2 in 10 minutes, more than 90% was within 1 hour. 4) For routine laboratory results, 1,423 patients(63%) spent between 1 to 2 hours and 8.5 % of them spent more than 2 hours. 5) For routine radiologic examination, 2,098 patients(63%) spent between 10 to 30 minutes and 4.1 /o spent more than 2 hours. 6) For 200 patients(36.6% ), waiting time for special radiologic examination was between 1 to 2 hours and 7% waited rnore than 4 hours. 7) In time interval between notification and initial assessment of each department, 1, 789 patient(42.7% ) took less than 10 minutes and more than 1 hour for 5.2% of patients. 8) Admission rate was 20.7% (869 patients) and for 203 patients it took less than 1 hour but for 12% of patients more than 12 hours for admission order. 9) 31 % of patient was to transfer to admission room within 1 hour, 20.1 % of patient was after 24 hour. 10) In time interval between receipt and discharge, 878 patient(26.6%) took 1 to 2 hours and 5.1% more than 24 hours.
소스코드의 그래프 변환 및 그래프 데이터베이스에서의 활용에 대한 연구
장석준 ( Seok-joon Jang ),김수현 ( Su-hyun Kim ),이임영 ( Im-yeong Lee ) 한국정보처리학회 2023 한국정보처리학회 학술대회논문집 Vol.30 No.2
최근 수많은 오픈소스로 공개되면서, 대부분의 소프트웨어가 오픈소스를 활용하여 구현되고 있다. 하지만, 오픈소스에 적용되어 있는 라이선스 간의 충돌 문제가 발생하면서, 라이선스 위반 문제가 지속적으로 발생하고 있다. 이러한 문제를 사전에 방지하기 위해 소스코드 분석이 필수적이지만, 다양한 기능이 실행되는 소스코드 특성 상 소스코드만 봤을 경우 직관적으로 분석이 어렵다는 문제점이 있다. 최근 소스코드의 효과적인 분석을 도와주는 다양한 도구들이 개발되었고, 그 중 한 가지 방법은 소스코드를 그래프로 변환하여 시각적인 편의성을 제공하는 방법이다. 그래프로 변환된 소스코드는 해당 시점에는 분석이 가능하지만, 분석이 필요할 때마다 변환을 해야 하는 문제점이 존재한다. 따라서 소스코드를 변환한 그래프 데이터를 저장하는 방법이 요구되었는데, 그래프 데이터베이스의 경우 특정 파일 형식만 지원하기 때문에 그래프 데이터 저장에 어려움이 존재한다. 본 제안방식에서는 소스코드를 변환한 그래프 데이터를 그래프 데이터베이스에 효과적으로 저장하고, 분석이 요구될 때마다 데이터베이스 상에서 즉각적으로 분석이 가능한 방법을 제안한다.