시소러스를 이용한 facet기반 소프트웨어 부품 검색 시스템의 설계 및 구현

김기헌(Ki Heon Kim),최재훈(Jae Hun Choi),김훈희(Hoon Hee Kim),배명남(Myung Nam Bae),양재동(Jae Dong Yang),금창섭(Chang Sup Keum) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.1B

객체 지향 소프트웨어들이 데이터베이스에 체계적으로 저장 · 관리된다면, 재사용을 통해 소프트웨어 생산성 및 품질 향상에 크게 기여할 수 있다. 기존의 부품 검색 시스템들은 분류 혹은 색인에 기반한 검색 방법을 사용한다. 분류를 기반한 검색 방법은 사용자 의도를 질의로 명확히 표현할 수 없기 때문에 사용자의 요구에 따라 부품을 검색하기 어렵다. 한편, 색인을 기반한 검색 방법은 부품의 특성을 명확히 반영할 수 있는 색인어 선정이 매우 어려우며, 질의에 표현된 탐색어와 의미적으로 일치하는 부품을 검색할 수 없다는 단점을 가지고 있다. 이러한 문제점을 보완하기 위해 본 논문에서는 시소러스를 기반한 소프트웨어 부품 검색 시스템을 설계 · 구현한다. 구현된 부품 검색 시스템은 1) facet을 기반한 검색 방법과 색인어를 기반한 검색 방법을 동시에 사용할 수 있으며, 2) 사용자 질의와 의미적으로 일치하는 부품을 검색하기 위해 시소러스를 참조하여 불리언 facet질의를 표현할 수 있도록 하였고, 3) 검색된 부품들 중에서 개발자의 요구에 가장 적합한 부품을 선정할 수 있도록 지원하는 부품 항해기능을 제공한다.

차량 코너 모듈 캠버 강성 성능에 영향을 미치는 인자에 대한 연구

김기헌(Ki-Hun Kim),이수경(Soo-Kyung Lee),박천일(Chun-Il Park) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11

Camber stiffness performance of the vehicle corner module affects the handling and NVH performance of the vehicle. If the performance does not ensure camber stiffness, the lateral load is applied to the brake disc in contact with the pads on the corner modules can cause noise. The vehicle camber stiffness performance is good can be stably turning at high speed. This performance is a vehicle basic performance required in high-performance vehicle. The corner module consists of a bearing, knuckle, hub, and so on. And it is classified into first generation ~ 4G by bearing structure. Rigidity and NVH performance is improved in accordance with the generation of the axle bearing. This paper will show to introduce the camber stiffness analysis method of the axle units and to derived for the performance influencing factors.

도시공간의 입체적 활용을 위한 지하공간 네트워크 형성 방안 연구

김기헌(Kim, Ki-Hun) 한국부동산정책학회 2020 不動産政策硏究 Vol.21 No.1

The underground space of the city is not affected by the external environment such as the climate and can be used, and is considered as an alternative to complement the saturated space development on the ground. In particular, the city center is well-equipped with urban infrastructure and specialized in functions such as work and shopping, but it is used by many people.However, it is difficult to secure space through the development of the land. This is getting attention. However, the existing underground spaces are created by the development of building units or blocks, and are operated in the form of individual and simple basement floors. This form has become a factor that makes urban underground spaces not interconnected and cannot function as a three-dimensional urban space. In this regard, this study studied the direction of underground space development and network connection plan in Myeong-dong, Jung-gu, which is the central part of Seoul. As a result of analyzing the foreign cases, it was found that it should be promoted to develop the three-dimensional space of the underground and the ground through systematic urban planning, and to promote public-private projects through the SPC project, but it is necessary to secure the publicness of the space. In addition, it was found that the management of the urban planning level was required along with the legal system for the development of underground spaces, the connection of surrounding buildings and underground passages, and the development of underground integration between buildings. This study planned the connection of underground spaces in Myeong-dong, downtown Seoul. First, a survey was conducted for users and merchants around them. Users did not know relatively well about the installation of underground shopping malls and used frequently as a means of walking. However, they were dissatisfied with the inconvenience of vertical movement and the underground space without any features. Although there are many underground shopping malls around the Myeong-dong area, underground spaces are disconnected and there are problems that cannot be connected to adjacent buildings. Nine locations were planned. This plan is expected to help T-shaped underground space network beneath Eulji-ro and Namdaemun-ro to reorganize the pedestrian system in the city center and to utilize the three-dimensional space connecting the underground and the ground. This study presented the basic master plan to activate the underground shopping center and build a three-dimensional walking network through the connection of the disconnected underground space in the city center. However, linking existing underground spaces and creating new ones will require detailed action plans with contextual guidelines and legal reviews. In addition, it is necessary to induce private sector participation in SPC projects and the integration of surrounding basements, and to establish guidelines for the installation and utilization of basement facilities to utilize integrated underground space in the future.

주택재개발사업의 사업성 예측모형 : 서울시 주택재개발사업을 중심으로

김기헌(Kim, Ki-Hun) 한국부동산정책학회 2018 不動産政策硏究 Vol.19 No.3

This study explores business prediction model by using discriminant analysis and logistic regression analysis which are based on the physical status of the business district, the project period and the change of the project area in the residential redevelopment project of the Seoul Metropolitan City. As a result, although the predictive degree of the two models is relatively high, more than 70%, predictive degree for low-feasibility areas is lower than that for high feasibility areas. The effects of variables on the business performance of the residential redevelopment project were examined by discriminant analysis and positive(+) and negative(-) effects of influence were examined through logistic regression analysis. The physical element, the number of removal buildings and the area variable had the highest influence, the area had the positive effect, and the removal structure had the negative effect. The duration of each step has the second highest impact, and all three variables have negative effects. Lastly, it is analyzed that the change of the zoning which is the urban planning factor shows the weak influence and the negative effect. However, unlike the existing studies, it is significant that the period of the housing redevelopment project, the physical factors of the district, and urban planning factors were used, and the linear regression analysis model was improved to present the discriminant analysis and the logistic regression model.

라텍스 개질 콘크리트의 투수성 및 동결융해 저항 특성

김기헌(Ki-Hun Kim),이종명(Jong-Myong Lee),홍창우(Chang-Woo Hong),윤경구(Kyong-Ku Yun) 한국콘크리트학회 2001 콘크리트학회논문집 Vol.13 No.5

트라이포드 등속 조인트의 진동에 대한 고찰

김기헌(Kim, Ki Hun),송명의(Song, Myung Eui),민준호(Min, Jun Ho) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12

Constant velocity joint(CVJ) creates the generated axial force (G.A.F) when the vehicle is driven. Because this phenomenon can give driver bad driving feeling, sensitive quality of vehicle is declined. Axial force at CVJ is generated by friction between parts of CVJ. In this study, cause of G.A.F of tripod typed CVJ (plunging type) is found by mechanical and dynamic analysis. A numerical analysis of CVJ is conducted using the Multi-body dynamic simulation program DAFUL.

유아교육 및 보육 경험의 장기 효과

김기헌(Ki Hun Kim),신인철(In Chol Shin) 한국사회학회 2012 韓國社會學 Vol.46 No.5

이 연구는 유아교육 및 보육 경험이 초등학교에서 중학교에 이르는 기간 동안 사회성 발달 및 학업성취도에 긍정적인 영향을 미치는지 여부를 살펴보았다. 어린이집이나 유치원 같은 유아교육 및 보육시설 경험의 인과적 효과성을 입증하기 위해 이 연구는 미경험자와 경험자의 선정에 있어 무작위성(randomness)을 확보할 수 있는 매칭 방법(matching methods)으로 CEM(Coarsened Exact Matching) 방법을 활용하여 분석하였다. 한국 청소년 패널조사(KYPS) 자료를 이용하여 분석한 결과, 유아교육 및 보육 경험은 유치원의 경우 또래 관계 및 학업성취도에 통계적으로 유의미한 정(+)의 효과를 보여주고 있으나 어린이집의 경우 미경험 집단과 비교해 통계적으로 유의미한 차이를 보여주지 않았다. 이러한 결과는 선행 연구들에서 밝혀진 생애초기 유아교육 및 보육의 장기 효과를 증명하는 동시에 경험하는 시설 유형에 따라 그 효과가 다를 수 있음을 말해준다. 이 연구는 유아교육 및 보육의 장기 효과를 밝혀낸 것으로 생애초기 교육 및 보육 지원 확대의 근거를 밝혀냈다는 데 의의가 있으며 정책적 측면에서 어린이집의 장기효과가 발견되지 않았다는 점과 관련하여 유치원과 어린이집으로 이원화된 체계를 단순 통합하는 것 이상으로 두 시설들 의 질적 차이를 개선할 필요가 있음을 지적하였다. This study has analyzed that kindergarten and child care centers can improve the social development and academic achievement of elementary and middle school students in 5th to 8th grade using Korea Youth Panel Survey(KYPS) data and random effects generalized ordered probit model. We have used the matching method(Coarsened Exact Matching) that is a non-parametric method of preprocessing data for reducing imbalance between the treated and control group. As a result, we found kindergarten to produce a long-term effect on peer relationships and academic achievement in regards to reading, foreign language, and math test scores from 5th to 8th grade. Additionally, we found that child care centers show no effect on social and cognitive development. These results show that preschool programs produce positive effects on children’s social skills and learning ability, however those effects vary in size and persistence depending on the type of program the student participated in. This study suggests that well-designed preschool education programs produce long-term improvements in academic success. Thus public policy makers should put more effort into reducing the gap of qualities existing within kindergarten and child care centers.

도시계획시설 중복결정을 통한 고령자 주택 공급 사례 연구

김기헌(Kim, Ki-Hun),고덕균(Ko, Duk Kyun) 한국부동산정책학회 2013 不動産政策硏究 Vol.14 No.1

The complex of land use is consistently demanded in Seoul these days, because there are no any more land to develop in Seoul. Futhermore, New paradigm in urban development have been demanded instead of the development of the past. The purpose of this study is to improve the supply of rental house for the aged by Over-determination in Urban Planning Facilities. The study was done in following process. First, the literatures on this subject were investigated to seek the problems of Over-determination in Urban Planning Facilities. Second, Statistics of the number of the aged, welfare facilities and financial independence rate was investigated to determine the supply priority of rental house. Third, the efficiency of Land Use Planning was suggested in the Case Study. Followings are suggested for improvement of the issues. First, the current law would be revised. because there are many separated laws related on Over-determination, they don t easily cooperate in establishing urban plan. therefore, many separated laws have to be combined to improve the efficiency of land use. Second, the specific criteria of divided surface right has to be established by law to protect private property. Because Over-determination can negatively affect private property. Third, the specific criteria of noise, oscillation and separation distance of under ground space has to be established by law to minimize the problems in Over-determination.

일본 소비생활에 관한 패널조사(JPSC)의 소개

김기헌(Ki Hun Kim) 한국노동연구원 2004 노동정책연구 Vol.4 No.1

본 논문에서는 국내에 잘 알려져 있지 않은 일본의 2차 분석 자료의 현황을 제시하고 특히 일본의 대표적인 패널조사인 「소비생활에 관한 패널조사(JPSC: Japanese Panel Survey on Consumers)」의 조사설계, 조사방법 및 이용방법과 제한점을 밝히고 있다. JPSC는 일본의 젊은 여성을 대표하는 패널표본 구성원을 대상으로 1년에 1회씩 구성원의 수입ㆍ지출ㆍ저축, 취업활동, 가족관계, 배우자 등에 관하여 1993년부터 현재까지 추적 조사하고 있는 종단 조사(longitudinal survey)이다. 이 논문의 목적은 한일간의 비교연구를 활성화한다는 측면에서 일본 자료에 관한 접근가능성을 높이는 데 있으며 동시에 JPSC의 조사설계와 방법을 검토함으로써 국내의 패널조사에 대한 방법론적 시사점을 얻는 데 있다. This Study reviews panel data design, sampling method, data collecting procedures, questionnaire of the Japanese Panel Survey on Consumers (JPSC). the JPSC was collected by the Institute for Research on Household Economics and, is a longitudinal survey on Japanese young women regarding their consumer life and economic activities. The main purpose of this paper is to introduce the JPSC to Korean researchers for the extension of comparative studies. Also, this paper examines the design and methodology of the JPSC to extract methodological implications for Korean panel surveys.

차량 코너 모듈 횡강성 성능에 영향을 미치는 인자에 대한 연구

김기헌(Kim, Ki-Hun),이수경(Lee, Soo-Kyung),박천일(Park, Chun-Il) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12

Lateral stiffness performance of the vehicle corner module affects the handling and NVH performance of the vehicle. If the performance does not ensure lateral stiffness, the lateral load is applied to the brake disc in contact with the pads on the corner modules can cause noise. The vehicle lateral stiffness performance is good can be stably turning at high speed. This performance is a vehicle basic performance required in high-performance vehicle. The corner module consists of a bearing, knuckle, hub, and so on. And it is classified into first generation ~ 4G by bearing structure. Rigidity and NVH performance is improved in accordance with the generation of the axle bearing. This paper will show to introduce the lateral stiffness analysis method of the axle units and to derived for the performance influencing factors.