프로세스 복잡도에 기초한 변환 분석기의 설계 및 구현

홍의석(Euy Seok Hong),우치수(Chi Su Wu) 한국정보과학회 1995 정보과학회논문지(B) Vol.22 No.9

구조적 설계 방법론은 구조적 분석 결과로부터 1차 구조도를 생성하는 변환 분석 방법을 제시하고 있다. 분석의 결과인 요구 사항 명세로 부터 구조도를 유도하는 자동화된 변환 분석기는 분석과 설계단계의 작업을 일관되고 체계적으로 연결해주는 도구이므로 구조적 기법 지원 CASE 환경에서 중요한 위치를 차지한다. 본 논문에서는 여러 CASE 도구들의 변환 분석기들에 사용된 변환 방법들의 문제점들을 기술하고, 그들을 해결하기 위한 새로운 변환 방법을 제시한다. 새로운 변환 방법은 의미적인 분석에 의한 프로세스의 복잡도 정의와 그를 이용한 중심 변환 선정 알고리즘, 시스템 설계자의 의견을 첨가시킬 수 있는 중심 변환 확인 윈도우, 복잡하지 않은 구조도를 생성할 수 있는 모듈분해 방법을 포함한다. 이러한 변환 방법을 사용한 변환 분석기를 UNIX 환경 하에서 X 윈도우를 사용하여 구현하였다. The Structured Design methodology suggests the Transform Analysis technique converting requirement specs into a first-cut structure chart. Because the automatic Transform Analyzer links analysis with design stage consistently, it plays an important role in CASE environment supporting the structured methodology, In this paper, we describe the problems in techniques adopted in the various transform analyzers and suggest a new technique to solve them The now transformation technique contains a central transform identification algorithm using the process complexity metric based on the semantic analysis, It also contains a central transform confirmation window that enables the system designer's opinion to be included in the central transform identification process, and a factoring method generating a simpler structure chart. We have implemented tool using this technique in the UNIX environment using the X window system.

페놀수지 기반 복합재료의 마찰 마모 특성

홍의석(Ui Seok Hong),정소라(So La Jung),장호(Ho Jang),김성진(Seong Jin Kim) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.11

Tribological properties of phenolic resins in the friction materials for C-SiC brake systems were investigated. Boron-phosphorus modified resin, silicon modified resin, and straight resin were used as binders of friction materials. A simple formulation containing aramid pulp, potassium titanate, zircon silicate, and phenolic resin was used to investigate the effect of the resins at elevated temperatures up to 400℃. Friction stability and wear rate of the three friction materials were compared as a function of temperature and the activation energy for the wear rate of the three phenolic resins were obtained from Arrhenius type plot. It was found that the composite materials clearly exhibit different wear mechanisms below and above the critical temperatures. The friction materials with B-P modified resin showed good wear resistance and friction stability compared with the others.

소프트웨어 모듈 심각도 측정을 위한 메트릭 집합

홍의석(Euy-Seok Hong) 한국컴퓨터정보학회 2015 韓國컴퓨터情報學會論文誌 Vol.20 No.1

모든 소프트웨어 결함들이 시스템에 같은 정도의 영향을 미치는 것이 아니므로 결함이 미치는 충격의 정도를 나타내는 결함 심각도는 소프트웨어 품질 관련 작업들에 중요한 역할을 하고 있다. 결함 심각도 관련 기존 연구들은 심각도 레벨은 정의하였지만 품질 작업의 기본 단위인 모듈의 심각도에 관한 언급은 거의 없었다. 본 논문에서는 심각도 레벨이 증가함에 따라 심각도 값이 급격히 증가하는 심각도 성질을 이용하여 결함 심각도 메트릭을 지수 함수 형태로 정의한 후, 모듈 내부의 결함 수와 결함 심각도 메트릭에 기반한 새로운 모듈 심각도 메트릭 집합을 정의하였다. 제안 메트릭들의 적용가능성을 보이기 위해 Weyuker 기준들을 이용한 분석적 검증과 NASA 공개 데이터 집합을 이용한 실험적 검증을 수행하였으며, 제안 메트릭들 중 ms는 모듈의 심각도 정량화에, msd는 심각도에 기반한 시스템간의 비교에 매우 유용하게 사용될 수 있다는 것을 보였다. Defect severity that is a measure of the impact caused by the defect plays an important role in software quality activities because not all software defects are equal. Earlier studies have concentrated on defining defect severity levels, but there have almost never been trials of measuring module severity. In this paper, first, we define a defect severity metric in the form of an exponential function using the characteristics that defect severity values increase much faster than severity levels. Then we define a new metrics set for software module severity using the number of defects in a module and their defect severity metric values. In order to show the applicability of the proposed metrics, we performed an analytical validation using Weyuker’s properties and experimental validation using NASA open data sets. The results show that ms is very useful for measuring the module severity and msd can be used to compare different systems in terms of module severity.

관광용 계류식 헬륨기구 개발

홍의석(Eui-seok Hong),박승신(Seung-sin Park),강왕구(Wanggu Kang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5

Shin Young Heavy Industry Co., Ltd. has developed tethered helium balloon for tourism with the technical consulting of KARI(korea aerospace research institute). The tethered helium balloon is becoming more popular in europe for city tourism and advertisement. The tethered balloon can climb up to 150m by the buoyancy of helium gas with 25 passengers. The main system of the tethered helium ballon consists of envelope for lifting gas(helium), gondola for passengers, winch system for operation(climbing & descent) and pressure control system of envelope. All main systems were developed by korean companies and engineers. The development requirement of the balloon system were set-up for domestic regulation and operating This paper summarized the final result of designing, fabrication and functional test of the balloon. The developed balloon will be in installed and make operation in this year.

대형 소프트웨어 시스템의 결함경향성 예측을 위한 혼성 메트릭 모델

홍의석(Euy Seok Hong) 한국컴퓨터교육학회 2005 컴퓨터교육학회 논문지 Vol.8 No.5

결함 심각도에 기반한 소프트웨어 품질 예측

홍의석(Euy-Seok Hong) 한국컴퓨터정보학회 2015 韓國컴퓨터情報學會論文誌 Vol.20 No.5

소프트웨어 결함 예측 연구들의 대부분은 입력 개체의 결함 유무를 예측하는 이진 분류 모델들에 관한 것들이다. 하지만 모든 결함들이 같은 심각도를 갖지는 않으므로 예측 모델이 입력 개체의 결함경향성을 몇 개의 심각도 범주로 분류할 수 있다면 훨씬 유용하게 사용될 수 있다. 본 논문에서는 전통적인 복잡도와 크기 메트릭들을 입력으로 하는 심각도 기반 결함 예측 모델을 제안하였다. 학습 알고리즘은 많이 사용되는 네 개의 기계학습 기법들을 사용하였으며, 모델 구조는 삼진 분류 모델로 하였다. 모델 성능 평가를 위해 실험 데이터는 두 개의 NASA 공개 데이터 집합을 사용하였고, 평가 측정치는 Accuracy를 이용하였다. 평가 실험 결과는 역전파 신경망 모델이 두 데이터 집합에 대해 각각 81%와 88% 정도의 Accuracy 값으로 가장 좋은 성능을 보였다. Most of the software fault prediction studies focused on the binary classification model that predicts whether an input entity has faults or not. However the ability to predict entity fault-proneness in various severity categories is more useful because not all faults have the same severity. In this paper, we propose fault prediction models at different severity levels of faults using traditional size and complexity metrics. They are ternary classification models and use four machine learning algorithms for their training. Empirical analysis is performed using two NASA public data sets and a performance measure, accuracy. The evaluation results show that backpropagation neural network model outperforms other models on both data sets, with about 81% and 88% in terms of accuracy score respectively.

도시환경과 보행자 안전: 서울시 사례 연구

홍의석(Andy Hong), 양욱재(Wookjae Yang) 도시건강학회 2023 도시건강연구 Vol.2 No.1

Despite numerous studies on pedestrian safety, research on the impact of the built environment on pedestrian crashes have produced mixed results. This may be due to lack of understanding of exposure and risk factors in the built environment that could influence pedestrian safety. This study investigates the relationship between built environment characteristics and pedestrian crashes with a specific emphasis on exposure and risk factors. Using detailed traffic accident data accumulated over multiple years (2007-2021) in Seoul, Korea, we find significant relationships between crash counts and the built environment. Specifically, several D variables, such as population density, job-housing balance, and park density have statistically significant relationships with crash frequency. Also, risk and exposure-related factors, such as vehicle volume and speed, are strongly associated with pedestrian safety. These findings will help policymakers to develop effective land use policies and street design guidelines to ensure healthier and safer pedestrian environments.

탄성지지된 단경간 교량의 최대 충격계수 응답스펙트럼 생성

홍의석(Hong, UiSeok),박경훈(Park, Kyung-Hoon),노화성(Roh, Hwasung) 대한토목학회 2017 대한토목학회 학술대회 Vol.2017 No.10

차량 이동하중에 따른 연속교 경간별 최대 충격계수 분석

홍의석 ( Hong Euiseok ),박경훈 ( Park Kyung-hoon ),노화성 ( Roh Hwasung ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1

For the evaluation of load carrying capacity of continuous bridges, the testing target span should be selected where peak impact factor can be expected. In this paper, two and three continuous bridges with equal span length are considered and the moving vehicle load analysis is performed. All possible vehicle speeds are applied to the bridges and the peak impact factors obtained for each span are investigated. From the results, the maximum peak impact factors are developed at the middle of the first span to the direction of vehicle moving.

SDL 메트릭 집합의 분석적 검증

홍의석 ( Euy Seok Hong ),정명희 ( Myung Hee Jung ) 한국정보처리학회 2000 정보처리학회논문지 Vol.7 No.4

Design metrics that quantify the design phase play an important role in reducing system development cost because the problems in early phases of software development seriously affect the quality of the late products. Real-time systems such as telecommunication systems are so large that design quantification is more important in real-time system design. Although many metrics have been proposed, few of them are correctly validated. This paper revises the SDL metrics set proposed in earlier study [9] and perform an analytical validation of the metrics set. Axiomatic approach and dimensional analysis are used for metrics validation and the old metrics are revised to satisfy the validation criteria.