기후정보를 반영한 확률적 일정계획수립 모델 개발

박재현,김경훈,김재준,Park, Jae-Hyun,Kim, Kyong-Hoon,Kim, Jae-Jun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.2

This study aims to overcome problems of scheduling established by planner's institution and judgment. By introducing stochastic approach, this study proposes a method to predict work duration on the construction sites reflecting work information generated around unit work of previous cases and non-working day, and this model was verified by its application to a case study. As a result of analyses on previous researches in an attempt to develop work duration model, there were several studies on estimating work duration based on stochastic approach. However, previous researches could not predict work duration in different construction sites because unit work was not separated. Accordingly, this study attempts to suggest a practical method to predict work duration in advance in pre-construction phase where construction is not under way. After predicting construction time of a site where duration is supposed to be predicted based on the data of measuring case study, verification of this model was carried out in compared to real construction time. In consequence, work duration within twelve days was been estimated with a margin of error of 5%. In addition, the period for actual construction turned out ten days, which was analyzed within twelve day. Therefore, model of this study show the practical method estimating work duration in pre-construction phase.

북한산국립공원의 계류수질 보전 전략(I)

박재현,우보명,김우룡,안현철,조현서,추갑철,김춘식,최형태,Park, Jae-Hyeon,Woo, Bo-Myeong,Kim, Oue-Ryong,Ahn, Hyun-Chul,Cho, Hyun-Seo,Choo, Gab-Chul,Kim, Choon-Sig,Choi, Hyung-Tae 한국환경복원기술학회 2001 한국환경복원기술학회지 Vol.4 No.3

This study was conducted to investigate physicochemical property changes from July 1998 to August 2001 in Mt. Bukhansan National Park. Four water sampling points were selected to measure the quality of stream water in the northeastern part of the Mt. Bukhansan National Park. The results were summarized as follows; In spring, the average pH of stream water was below the first class of the river water quality standard, while it was normal level in summer. The average electrical conductivity was about 2.3~3.3 times higher in downstream water than in upstream water during spring and summer. The contents of anions($Cl^-$, $NO{_3}^-$, $SO{_4}^{2-}$) were about 1.1~7.4 and 0.4~11.4 times higher in downstream than in upstream water, respectively. These results indicate that water quality was poorer in downstream than in upstream water. We suggest that stream water in the Mt. Bukhansan National Park should be protected from impacts of snow melting mineral particles in spring season and human impacts like wastewater of point source in summer season.

작업자의 작업공구에 따른 근골격계 질환과 작업효율 모델

박재현,김경훈,김재준,Park, Jae-Hyun,Kim, Kyong-Hoon,Kim, Jae-Jun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.2

Due to a massive outbreak in the workplace and a rapid increase of industrial disaster victims, musculoskeletal disorders is recently emerging as a major issue in the field of industry safety and health. Musculoskeletal disorders has already held a high rank of occupational diseases in advanced countries and it is rapidly growing every year in Korea. In particular, it is expected that people working in the construction industry have higher rates of musculoskeletal disorders given that the construction industry requires a higher level of dependence on human labor and laborers' high intensity of physical labor outside. In this regard, targeting laborers involving in building construction, this study attempts to analyze the impact of musculoskeletal disorders which can be shown according to working hand tools, making to model musculoskeletal disorders on efficiency. As a result of analyses, it appears that there are differences in body parts that hurt skeleton and musculature between structural steel laborers and carpenters owing to different working hand tools they use. In case of structural steel laborers, they tend to feel most psychological distress when their necks and shoulders are under stress. In contrast, carpenter is likely to be agitated when their legs and knees are exposed to stress. Accordingly, this study is worthwhile by finding out different levels of musculoskeletal stress and different body parts depending on the tools laborers use, in turn proving that this has an impact on efficiency through modeling and quantifying it.

수도권 국도교량 세굴위험도 평가 및 등급화 사례 연구

박재현,김정훈,안성철,이주형,정문경,곽기석,Park,Jae-Hyun,Kim,Jeong-Hun,An,Seong-Chul,Lee,Ju-Hyung,Chung,Moon-Kyung,Kwak,Ki-Seok 한국방재학회 2008 한국방재학회논문집 Vol.8 No.2

홍수 시 세굴로 인한 교량 기초의 파괴는 국내외적으로 교량 붕괴의 첫 번째 원인이다. 본 연구에서는 수도권 지역의 실제 국도교량에 대하여 세굴 위험도 평가 및 등급화를 수행하였다. 30개소 교량을 선정하여 지반 시추조사를 포함한 현장조사, 설계 홍수량에 대한 교량세굴 해석, 그에 따른 교량기초의 지지력 평가 및 위험도 분석을 하였고, 이를 바탕으로 교량세굴 위험도를 등급화 하였다. 위험도 평가 결과 직접확대기초 교량 26개소 중 9개소 교량이 장래 세굴 위험 가능성이 있는 것으로 나타났고, 나머지 17개소 교량은 안정한 수준으로 나타났다 말뚝기초 교량 4개소 중 3개소의 교량이 유의할 만한 수준으로 지지력이 감소하는 것으로 평가되었다. Foundation failure due to bridge scour during floods is the leading cause of bridge failure. Performed were the evaluation of bridge scour vulnerability and prioritization on real bridges registered in the National Highway Bridge Inventory of the capital region. The case studies for 30 national highway bridges consist of site investigation including boring test, bridge scour analysis fur the design flood, bearing capacity evaluation of the bridge foundation before and after scour, comprehensive evaluation of bridge scour vulnerability, and prioritization. Nine of 26 spread (feting bridges showed the potential future vulnerability to scour with significant decrease in the bearing capacity of foundations due to scour and the remaining 17 spread footing bridges were expected to maintain their stability to resist the effects of scour. Three of 4 pile foundation bridges exhibited considerable decrease in the bearing capacity of foundation after scour.

갑상선 주위 종양으로 표현된 식도 신경초종 1예

박재현,김충배,전혜민,강상욱,정종주,이용상,남기현,장항석,정웅윤,박정수,Jae Hyun Park,Choong Bai Kim,Hyae Min Jeon,<SUP>1<,SUP>,Sang-Wook Kang,Jong Ju Jeong,Yong Sang Lee,Kee-Hyun Nam,Hang Seok Chang,Woong Youn Chung,and Cheong Soo 대한갑상선-내분비외과학회 2011 The Koreran journal of Endocrine Surgery Vol.11 No.1

우리나라 국민의 정신질환으로 인한 질병부담 추정

박재현,윤석준,이희영,조희숙,이진용,은상준,박종혁,김윤,김용익,신영수,Park, Jae-Hyun,Yoon, Seok-Jun,Lee, Hee-Young,Cho, Hee-Sook,Lee, Jin-Yong,Eun, Sang-Jun,Park, Jong-Hyock,Kim, Yoon,Kim, Yong-Ik,Shin, Young-Soo 대한예방의학회 2006 예방의학회지 Vol.39 No.1

Objectives: This study estimated the burden of disease especially caused by psychiatric disorders in Korea by using DALY, a composite indicator that was recently developed by the Global Burden of Disease study group. Methods: First, 11 of the major psychiatric disorders in Korea were selected based on the ICD-10. Second, the burden of disease due to premature death was estimated by using YLLs (years of life lost due to premature death). Third, for the calculation of the YLD (years lived with disability), the following parameters were estimated in the formula: the incidence rate, the prevalence rate and the disability weight of each psychiatric disorder. Last, we estimated the DALY of the psychiatric disorders by adding the YLLs and YLDs. Results: The burden of psychiatric disorder per 100,000 people was attributed mainly to unipolar major depression (1,278 person-years), schizophrenia (638 person-years) and alcohol use disorder (287 person-years). For males, schizophrenia (596 person-years) and alcohol use disorder (491 person-years) caused the highest burden. For females, unipolar major depression (1,749 person-years) and schizophrenia (680 person-years) cause the highest burden. As analyzed by gender and age group, alcohol use disorder causes a higher burden than schizophrenia in men aged 40 years and older. For females, unipolar major depression causes the highest burden in all age groups. Conclusions: We found that each of the psychiatric disorders that cause the highest burden is different according to gender and age group. This study's results can provide a rational basis to plan a national health policy regarding the burden of disease caused by psychiatric disorders.

건설기업의 지식경영 수준 평가모델개발에 관한 연구

박재현,백종건,김재준,Park Jae-Hyun,Baik Jong-Keon,Kim Jae-Joon 한국건설관리학회 2002 한국건설관리학회 논문집 Vol.3 No.4

국내의 건설기업들은 건설시장의 개방 및 경쟁의 심화에 따라 국제 경쟁력의 강화 및 지속적인 경쟁우위를 점하기 위하여 지식경영을 도입하여 개인의 지식들을 조직의 역량강화에 노력하고 있다. 그에 따라 학문적 측면에서도 지식경영의 발전이 계속적으로 이루어져 왔으며 오늘날에는 지식경영을 도입한 기업들의 수준 평가나 성과에 많은 관심을 보이고 있다. 하지만 실제 연구에 있어서는 성과부분에 너무 치우쳐서 정확한 수준 평가 없이 성과에 대한 언급만을 하고 있는 실정이다. 따라서 본 연구는 건설기업으로 하여금 정확한 지식경영의 수준을 평가하여 지식경영의 여러 영역 중에서 좀더 관심을 기울여야 할 분야를 제시함으로써 지식경 영을 균형적으로 발전시킬 수 있는 건설기업의 지식경영 수준 평가모델을 제시하였다. Knowledge Management(KM), represented as a way to sustain or gain competitive edge in domestic construction companies since late 1990s economic fluctuation, whose priority is to transform individual tacit knowledge into explicit organizational one. Also, accompanied by academic researches, they come to turn their interests on KM leveling and its results. However, they went too far to KM results without commenting what their KM capabilities are and where they should lead. Thus, this research work suggests a leveling model for KM, especially construction company, whose role is to diagnose which parts they should be encouraged or how to strengthen their present capabilities.

백운산 지역에서 계류수의 이화학적 성질에 미치는 양어장의 영향(II)

박재현,우보명,김우룡,안현철,Park, Jae-Hyeon,Woo, Bo-Myeong,Kim, Oue-Ryong,Ahn, Hyun-Chul 한국환경복원기술학회 2001 한국환경복원기술학회지 Vol.4 No.1

Quantifications of fish farm influences on stream water quality may provide basic informations on watershed management to reduce environmental impact due to fish farm development and to conserve stream water quality in forested watershed area. In this research stream water qualities around Mt. Paekun area were monitored seasonally and the following results were obtained. Due to the increase of pH in effluent water from the fish farm it was believed that alkalization of stream water can be accelerated by large scale development of fish farms in the forested watershed area. Negative effects on stream water quality were observed by indications of increase in electrical conductivity and temperature of effluent water from the fish farm. Decreases in physicochemical indices such as the amount of dissolved oxygen, percentage of dissolved oxygen, total amount of cation, total amount of anion and total amount of ion in effluent water from the fish farm were also negative aspects in downstream ecology. It is recommended that water purification system as well as eco-friendly fish farm design should be incorporated to large scale fish farm development plan in forested watershed area.

폴리머를 이용한 CIS(CMOS Image Sensor) 디바이스용 웨이퍼 레벨 접합의 warpage와 신뢰성

박재현,구영모,김은경,김구성,Park, Jae-Hyun,Koo, Young-Mo,Kim, Eun-Kyung,Kim, Gu-Sung 한국마이크로전자및패키징학회 2009 마이크로전자 및 패키징학회지 Vol.16 No.1

본 논문에서는 웨이퍼 레벨 기술을 이용한 CIS용 폴리머 접합 기술을 연구하고 접합 후의 warpage 분석과 개별 패키지의 신뢰성 테스트를 수행하였다. 균일한 접합 높이를 유지하기 위하여 glass 웨이퍼 상에 dam을 형성하고 접합용 폴리머 층을 patterning하여 Si과 glass 웨이퍼의 접합 테스트를 수행하였다. Si 웨이퍼의 접합온도, 접합 압력 그리고 접합 층이 낮을수록 warpage 결과가 감소하였으며 접합시간과 승온 시간이 짧을수록 warpage 결과가 증가하는 것을 확인하였다. 접합 된 웨이퍼를 dicing 하여 각 개별 칩 단위로 TC, HTC, Humidity soak의 신뢰성 테스트를 수행하였으며 warpage 결과가 패키지의 신뢰성 결과에 미치는 영향은 미비한 것으로 확인되었다. In this paper, the polymer adhesive bonding technology using wafer-level technology was investigated and warpage results were analyzed. Si and glass wafer was bonded after adhesive polymer layer and dam pattern for uniform state was patterned on glass wafer. In this study, warpage result decreased as the low of bonding temperature of Si wafer, bonding pressure and height of adhesive bonding layer. The availability of adhesive polymer bonding was confirmed by TC, HTC, Humidity soak test after dicing. The result is that defect has not found without reference to warpage.

적취(積聚)를 위주로 종양(腫瘍)의 병인병기(病因病機)에 관한 소고(小考)

박재현,엄석기,정현식,김경석,윤성우,최원철,Park, Jae-Hyun,Eum, Seok-Ki,Cheong, Hyun-Sik,Kim, Kyung-Seok,Yun, Seong-Woo,Choi, Won-Cheol 대한암한의학회 2007 大韓癌韓醫學會誌 Vol.12 No.1