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김덕진(Dukjin Kim),박진영(Jinyoung Park),하승철(Seungchul Ha),서효원(Hyo-Won Suh) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The competition in a globalized market demands maximizing the efficiency of enterprise activities. In the face of such challenge, companies are taking several measures such as business process reengineering or collaborative product commerce. These measures require specifying the overall enterprise activities. However, since most modeling methods focus on a specific level of activities, i.e. on high-level activities or low-level ones, enterprise modeling is difficult. Besides, as various modeling methods are used for each company, sharing process information is not easy. This research tries to solve this problem by providing schema for collaborative engineering process between companies. We propose an XML-based process modeling language with a data expression format that can be used in internet environments. This is appropriate since the process information exchange among companies is now conducted through the internet. We also suggest XML Schema for process information exchange. Our approach is to develop hybrid structured programming language to provide schema for modeling the collaborative engineering process efficiently. This language is originated from Graph structured and Block structured programming language. Our approach employs HF-EAM modeling method, which can model enterprise activities from abstract level to implementation level in a systematic and integrated way. In addition, it also provides runtime data information for interoperability. Based on this information, we provide a Collaborative Engineering Process Schema which is based on XPDL of WfMC and BPML. We also provide the structure of schema, modeling construct to express the process in graphical way, and XML instance of product development process in a real enterprise.
청소년 태권도선수가 지각하는 코치-선수관계와 탈진의 관계에서 자아탄력성의 매개효과
김덕진 ( Dukjin Kim ) 대한무도학회 2015 대한무도학회지 Vol.17 No.2
본 연구는 청소년 태권도선수가 지각하는 코치-선수관계와 탈진의 관계에서 자아탄력성의 매개효과를 검증하고자 하였다. 연구대상은 중·고등학교 태권도선수 400명(남학생 255명, 여학생 145명)이었다. 참여자들은 코치-선수관계, 자아탄력성 및 탈진 질문지에 자기평가기입법으로 작성하였다. 수집된 자료는 SPSS 18.0 통계프로그램을 사용하여 기술통계, 탐색적 요인분석, 확인적 요인분석과 신뢰도분석 및 상관관계분석을 실시하였고, 변인간 인과관계를 규명하기 위하여 AMOS 18.0 프로그램을 사용하여 구조방정식모형 분석을 실시하였다. 이러한 절차를 통해 얻은 연구결과는 다음과 같다. 첫째, 청소년 태권도 선수들이 지각하는 코치-선수관계는 자아탄력성에 정(+)의 직접 영향을 미치는 것으로 나타났다. 둘째, 자아탄력성은 탈진에 부(-)의 직접 영향을 미치는 것으로 나타났다. 셋째, 코치-선수관계는 자아탄력성을 경유하여 탈진의 부(-)의 간접 영향을 미치는 것으로 나타나 자아탄력성이 부분매개 역할을 하는 것으로 나타났다. The purpose of this study was to investigate the mediating role of ego-resilience on the relationships between perceived coach-athlete relationship and burnout in adolescent taekwondo athletes. Participants were 400(255 boys, 145 girls) middle school and high school taekwondo athletes who complete questionnaires to assess their perceptions of coach-athlete relationship, ego-resilience and burnout. A series of data analysis such as descriptive analysis, factor analysis, reliability analysis and correlation analysis were conducted using SPSS 18.0 program, and structural equation model(SEM) analysis was performed to identify the relations among the latent variables using AMOS 18.0 program. The results of SEM analysis indicated that perceived coach-athlete positively predicted athletes`` ego-resilience. Ego-resilience impact negatively influence on burnout. Finally, ego-resilience fully mediated the relationships between coach-athlete and burnout.
활성슬러지 모델을 이용한 A<sub>2</sub>O공법 영양염류 제거 및 미생물 거동
윤현식,김덕진,최봉호,김문일,Yoon, Hyunsik,Kim, Dukjin,Choi, Bongho,Kim, Moonil 대한상하수도학회 2012 상하수도학회지 Vol.26 No.6
In this study, simulation results of nitrogen and phosphorus removals and microbial activities for an $A_2O$ process in wastewater treatment plant are presented by using Activated Sludge Models (ASMs). Simulations were performed using pre-calibrated model and layout implemented in GPS-X simulation software. The models were used to investigate variations of SRT, water temperature, DO and C/N ratio effect on nutrients removal and microbial activity. According to the simulated results, the successful nitrification required SRT higher than 10.3 days, whereas increase of $NO_3$-N loading in the anaerobic reactor caused phosphorus release by PAOs; the effluent $NH_4$-N showed rapid change between $12^{\circ}C$(21.7 mg/L) and $13^{\circ}C$(3.2 mg/L); the effluent phosphorus was increased up to 1.9 mg/L at water temperature of $25^{\circ}C$; the DO increase was positive for heterotrophs and autotrophs growths but negative for PAOs growth; the PAOs showed low activity when C/N ratio was lower than 2.5. The experimental results indicated that the calibrated models can assure the prediction quality of the ASMs and can be used to optimize the $A_2O$ process.
EGR cooler Fouling이 냉각 성능에 미치는 영향에 관한 연구
남연우(Younwoo Nam),오광철(Kwangchul Oh),김덕진(Dukjin Kim),김종훈(Jonghun Kim),이천환(Chunhwan Lee),이춘범(Chunbeom Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Understanding the exhaust gas recirculation (EGR) cooler fouling in diesel engine is important factor in the durability characteristic of the EGR system. We develope the test rig and PM feeder using carbon black to examine the effect of fouling on EGR cooler devices those were consisted of flat and spiral type tube. The EGR cooler fouling process is a complex interaction involving heat exchanger shape, boundary condition, constitutes, chemistry and operating mode. As the soot deposited to EGR cooler, these formed a thin deposit layer that was less heat exchange than the fresh status of tube enclosing the exhaust gas, resulting in lower heat exchange effectiveness in both type coolers. But these deposits caused different results in pressure drop, it is increased in flat type, but decreased in spiral type of EGR cooler. A cause was estimated from a change of the flow structure and a decrease of contac area as the EGR cooler fouling.
항공기 탑재형 다중밴드 소형 0.3m급 영상레이다 및 지상 빅데이터 분석 시스템 개발
신승하(Seungha Shin),최문석(Munseok Choi),정철호(Chulho Jung),유종인(Jongin Ryu),김덕진(Dukjin Kim) 항공우주시스템공학회 2018 항공우주시스템공학회 학술대회 발표집 Vol.2018 No.11
3개 이상의 다중 주파수 밴드 및 다중 편파를 갖는 고해상도 영상레이다를 개발하여 항공기에 탑재 운영을 통하여 관심지역에 대해 순차 또는 동시에 전파 영상을 획득하는 시스템을 구현한다. 획득된 영상데이터를 빅데이터 시스템에 입력하여 결과를 분석하고 취득/합성된 영상데이터의 집합과 외부 데이터를 활용하여 가치 있는 정보를 추출하여 농업/임업/해양/국방 등에 활용할 수 있도록 한다.