EJB기반의 컴포넌트 개발 프로세스에 관한 연구

최일우,신정은,류성열 崇實大學校 生産技術硏究所 2001 論文集 Vol.31 No.-

Software component is one of the key technologies, which has goals to improve the productivity and the quality of software development. Recently, many enterprises try to introduce component technologies for efficient management of legacy software, fixing systematic process of software development, and cost reduction. In this paper, we propose a component development process for the component software assembled with Enterprise Java Beans components and J2EE patterns. also our proposal includes datail activities and instruction for each phase.

의료시설 실내공기질 특성 및 건강위해성 평가

최일우,이재성,김동기,류형열,김태현,이수문,이진영,최윤호,김현자 한국실내환경학회 2013 한국실내환경학회지 Vol.10 No.2

This study was performed to investigate the distribution of indoor air pollutants in medical facility in Gyeonggi-do area from February to November, 2012, and to conduct the health risk assessment from obtained data. PM10, CO₂, formaldehyde, CO, and total bacteria count(TBC) did not exceed the maintained standards, but mean concentration of TVOC was 402.3㎍/㎥ and thirteen of them exceeded the recommended standard. In the concentration distribution of pollutants for the monthly samples, CO₂, formaldehyde, TVOC, TBC were the highest level in August. From the factor analysis of indoor air pollution provided three factors; the first factor was seasonal factor (indoor temperature and humidity, TBC and formaldehyde), the second factor was ventilation factor (CO₂, PM10 and CO), and the third factor was building(or interior) factor (TVOCs). In the health risk assessment results, the excess carcinogenesis of formaldehyde for resonable maximum exposure worker was 1.21×10-4 which means exceeding the cancer criteria(1.0×10-4). We confirmed the probability of health effect caused by TVOC. The lifetime excess cancer risk of carcinogens(benzene, formaldehyde) and hazard quotient of non-carcinogens(toluene, ethylbenzene, xylene, styrene), and risk of regulation substances(PM10, CO₂) were safety level for inpatients and out patients.

레거시 시스템 진화를 위한 효율적 재공학 프로세스

최일우,류성열,Choi, Il-Woo,Rhew, Sung-Yul 한국정보처리학회 2003 정보처리학회논문지D Vol.10 No.5

1980년대 이후, 소프트웨어 위기에 대응하기 위한 다양한 소프트웨어 공학적 기법들이 출현하기 시작 하였고, 현재 소프트웨어의 질적 항상 및 생산성 향상을 꾀하기 위한 개발 지침으로 소프트웨어 개발 프로세스를 적용하는데 관심이 집중되어지고 있다. 그러나 대부분의 방법론들이 앞으로 구축한 새로운 시스템의 재사용성 확보에 치중할 뿐, 기존의 레거시 시스템 자원을 재사용하여 새로운 시스템을 구축하는 재공학 방법은 지원하지 못하고 있는 실정이다. 본 논문에서는 레거시 시스템의 효율적 진화를 위한 재공학 프로세스(Reengineering Process)로 RUP를 확장, 커스터마이징하여 구성한 RUP+re을 제시한다. RUP+re는 Small-h 모델을 바탕으로 크게 역공학 워크플로우(Reverse Engineering Workflow), 변환 워크플로우(Transformation Workflow), 진화 워크플로우(Evolution Workflow)로 구성되어진다. RUP+re의 각 워크플로우와 세부스텝을 제공하고 재공학 사례 연구론 통하여 실질적으로 프로세스를 검증함으로서 레거시 시스템 자원의 진화론 위한 소프트웨어 재공학 프로세스 구축에 효율적인 지침을 제공한다. The various software engineering techniques have been come out in order to cope with the software crisis since 1980's. These days the software Engineering has focused on the process of software development which is the guide for a qualify and productive improvement of software. But, most of the methodologies assume that a new system will be constructed and reused in the future. these do not support how we reuse legacy system's resources and construct a new system efficiently. In this paper, we present an efficient Reengineering Process for legacy system evolutions, RUP+re, which extends and customizes RUP. RUP+re consists of Reverse Engineering Workflow, Transformation Workflow and Evolution Workflow based on Small-h model. We describe RUP+re's workflows with their own detail steps and verify the process through the case study practivally. So, we provide efficient guidelines to the software Reengineering process construction which evolutes the resources of a legacy system.

An Empirical Study of Requirements Acquisition Process

최일우 한국IT정책경영학회 2016 한국IT정책경영학회 논문지 Vol.8 No.4

Requirements acquisition is a very important process when IT development project development process. The incorrect requirements acquisition occupies over 50-percent of project failure. In requirements engineering process, the requirements acquisition is the most important phase. The existing researches for requirements engineering do not present the detailed tasks, artifacts and techniques. Moreover the researches are inconsistent. Accordingly, requirements engineers are confused and have trouble in using the techniques. To solve the problem, new process for requirements acquisition based on the existing processes is proposed in this paper. The proposed requirements acquisition process consists of 5 activities and 17 tasks. This paper verifies the validity and efficiency of the proposed process through the empirical comparision with the existing researches using a statistical technique. The proposed process is used in the system analysis or system specification phase as the key information. It is also used to develop the CASE tool for requirements engineering as the base information.

산화주석 표적을 이용한 레이저 플라즈마에서 파장 대역폭이 좁은 극자외선 스펙트럼의 관측

최일우,HiroyukiDAIOD 한국물리학회 2002 새물리 Vol.44 No.5

Extreme ultraviolet spectra emitted from plasmas produced by using an Nd:YAG laser pulse focused on pure tin and indium and on their oxides were measured using a flat-field extreme ultraviolet spectrometer. The reasons for the bandwidth narrowing of the 13.5-nm transition array obtained when using targets of tin oxides instead of pure tin, especially SnO$_2$ film, are analyzed spectroscopically. The 13.5-nm transition array matches well with the center wavelength of Mo/Si multilayer and has a narrow spectral bandwidth; therefore, it can be used as a source of extreme ultraviolet radiation for an extreme ultraviolet lithography system using a multilayer. 순수 주석과 인듐 및 이들의 산화물 표적에 Nd:YAG 레이저를 집속할 때 형성되는 플라즈마에서 방출되는 극자외선 스펙트럼이 공간분해 가능한 평면결상형 극자외선 분광기로 관측되었다. 순수 주석 대신 산화주석, 특히 SnO$_2$ 필름을 표적으로 사용할 때, 주석 이온에서 방출되는 13.5 nm 전이열의 파장 대역폭이 좁아지는 이유가 분광학적으로 해석되었다. 이러한 13.5 nm 전이열은 Mo/Si 다층막의 중심 파장과 잘 일치하고 파장 대역폭이 좁으므로, Mo/Si 다층막을 사용하는 극자외선 리소그라피 시스템에서 극자외선 광원으로 이용될 수 있다.

Logit Analysis based Evaluation Model for Reliability of Software Company

최일우 한국IT정책경영학회 2017 한국IT정책경영학회 논문지 Vol.9 No.2

The existing technical evaluation methods for software development depend on the project plan to be realized, not making use of past performance record of the company. The primary factors for a project’s success are not quantitative ones like that of technical expertise, but rather qualitative ones like achievement ability, human resources, infrastructure, and customer confidence. These important factors that evaluate a software company’s reliability are being excluded from the company’s evaluations, making it necessary for devising an evaluation method that can reflect reliability at the time of the company evaluation. This study proposes a model to evaluate software companies based on Logit analysis that can evaluate reliability based on past project performance record of the company at the time of the evaluation. For the evaluation model, interviews and questionnaires were carried out based on software reliability engineering and previous study on project success factors. The GQM-based reliability estimation metric was designed from the results. In order to develop the company evaluation model that uses the defined reliability estimation metric, Logit analysis uses four assessment factors based on the statistical analysis on six assessment factors. The company assessment model is proposed from the results of the Logit analysis. The fitness of the proposed model is verified by a statistical analysis.

레거시 시스템의 재사용을 위한 RUP 기반의 효율적 재공학 프로세스

최일우,류성열,Choi, Il-Woo,Rhew, Sung-Yul 한국정보과학회 2002 정보과학회논문지 : 소프트웨어 및 응용 Vol.29 No.9

1980년대 이후, 소프트웨어 위기에 대응하기 위한 다양한 소프트웨어 공학적 기법들이 출현하기 시작 하였고, 현재 소프트웨어의 질적 향상 및 생산성 향상을 꾀하기 위한 개발 지침으로 소프트웨어 컴포넌트 개발 프로세스를 구축하는데 관심이 집중되어지고 있다. 그러나 대부분의 방법론들이 앞으로 구축할 새로운 시스템의 재사용성 확보에 치중할 뿐, 실질적으로 기존 레거시 시스템의 자원을 재사용하여 새로운 시스템을 구축하는 방법은 효율적으로 지원하지 못하고 있는 실정이다. 본 논문에서는 레거시 시스템의 효율적 재사용을 위한 재공학 프로세스(Reengineering Process)로 RUP를 확장, 커스터마이징하여 구성한 RUP+re을 제시한다. RUP+re은 크게 역공학 워크플로우(Reverse Engineering Workflow), 재공학 워크플로우(Re-Engineering Workflow), 순공학 프로세스(Forward Engineering Process)로 구성되어진다. RUP+re의 각 워크플로우와 세부스텝을 제공하고 실사례 연구를 통하여 실질적으로 프로세스를 검증함으로서 레거시 시스템 자원의 재사용을 위한 소프트웨어 재공학 프로세스 구축에 효율적인 지침을 제공한다. The various software engineering techniques have been come out in order to cope with the software crisis since 1980's. The software Engineering has focused on the process of software component development. The process products a development guide for a quality and productive improvement of software. But, most of the methodologies assume that a new system will be constructed and reused in the future. these do not actually support efficiently how we reuse legacy system's resources and construct a new system. In this paper, we present an efficient Reengineering Process for reusing legacy systems, RUP+re, which extends and customizes RUP. Rup+re consists of Reverse Engineering Workflow, Re-Engineering Workflow and forward Engineering Process. We describe RUP+re's workflows with their own detail steps and verify them practically through the case study. So, we provide efficient guidelines to the software Reengineering process construction which reuses the resources of a legacy system.

2400 grooves/mm 비등간격 오목에돌이발을 이용하는 평면결상형 연엑스선 분광기의 특성 해석

최일우,남창희 한국광학회 2002 한국광학회지 Vol.13 No.3

파장 50 $\AA$ 이하의 연엑스선 영역에서 사용될 평면결상형 연엑스선 분광기의 구성요소와 정렬조건을 결정하고 분광기의 분광학적 특성을 해석하였다. 평면결상형 연엑스선 분광기는 토로이드거울, 실틈, 비등간격 오목에돌이발, 연엑스선 검출기로 구성되어 있다. 토로이드거울과 홈간격이 2400 grooves/mm인 비등간격 오목에돌이발을 사용하여 공간분해된 빛띠가 단일 평면 위에 결상되도록 분광기를 구성하였다. 토로이드거울은 연엑스선 광선이 에돌이발에 비스듬하게 입사할 때 발생되는 비점 수차를 보상하기 위해 사용되었다. 파면수차 이론을 적용하여 분광기가 가지는 파장분해와 공간분해를 계산하고, 에돌이 현상에 대한 스칼라 이론을 적용하여 에돌이발의 에돌이효율을 계산하였다. The components and alignment parameters of a flat-field soft x-ray spectrometer used in the wavelength range below 50 $\AA$ are determined, and the characteristics of the spectrometer are analyzed. It consists of a toroidal mirror, a slit, a varied line-spacing concave grating, and a soft x-ray detector. The space-resolved spectral image of a source is formed on a single plane using the tordidal mirror and the 2400-grooves/mm varied line-spacing concave grating. The former is used to compensate for the astigmatism caused by the grazing incidence of soft x-ray light on the concave grating. The spectral and spatial resolutions of the spectrometer are calculated by applying the wave front aberration theory, and the diffraction efficiency is calculated by applying the scalar diffraction theory.

고출력 레이저를 이용한 상대론적 현상 연구 : 고에너지 엑스선 및 입자빔 발생

최일우,김정훈,고도경 한국물리학회 2005 물리학과 첨단기술 Vol.14 No.11

따로 또 같이-크리스마스와 선물

최일우 우리신학연구소 2003 갈라진 시대의 기쁜소식 Vol.- No.613