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.

지리산국립공원내 칠선계곡 탐방로의 회복에 관한 분석

박재현 ( Jae Hyeon Park ) 한국환경보건기술학회(구 한국환경복원녹화기술학회) 2010 한국환경복원기술학회지 Vol.13 No.2

To investigate the restoration procedure on soil physical properties at the surface of visiting road affected by rest-year system. This study was carried out at visiting roads of stream of Chilsun in Jirisan. Mean soil strength in 20cm of soil depth was lower in the Rest-Year System areas (1.5-1.9 times in Site 2, 1.1-7.5 times in Site 3) than in the control (Site 1). Soil strength was recovered by the Rest-Year System in the national park. Mesopore rate (pF 2.7) in 0-15 cm of soil depth was higher in the Rest-Year System areas (1.2 times) than in the control. This indicates that mesopore rate is rapidly restoring in the Rest-Year System areas. Pore space rate in 0-7.5 cm of soil depth was higher in the Rest-Year System areas (23.2% in Site 2, 23.6% in Site 3) than in the control (22.4% in Site 1). Pore space rate in 7.5-15 cm of soil depth was also higher in the Rest-Year System areas (22.9% in Site 2 and Site 3) than in the control (18.9% in Site 1). Soil pore space was remediable by the Rest-Year System. Bulk density in 0-7.5 cm of soil depth was lower in the Rest-Year System areas (1.674g/cm3 in Site 2, 1.668g/cm3 in Site 3) than in the control (1.723g/cm3 in Site 1). Bulk density in 7.5-15 cm of soil depth was lower in the Rest-Year System areas (1.785g/cm3 in Site 2 and 1.721g/cm3 in Site 3) than in the control (1.721g/cm3 in Site 1). Soil bulk density was decreased in the Rest-Year System areas of the national park. Amount of soil erosion was lower in the Rest-Year System areas (0.017m3/km/yr in site 2, 0.023m3/km/yr in site 3) than in the control (0.054m3/km/yr in site 1).

일본(日本)에서 한류변(漢流邊)의 환경부원(環境復元) 발전전략(發展戰略)(I)

박재현,우보명,이헌호,Park, Jae-Hyeon,Woo, Bo-Myeong,Lee, Heon-Ho 한국환경복원기술학회 2000 한국환경복원기술학회지 Vol.3 No.1

This study was carried out to introduce current status and development strategy for an environmental restoration of stream side in Japan, and to consider a methodology which could be effectively applied for the environmental restoration of stream side in Korea. Since the end of 20th century, the native ecology and landscape of Japan remained only a limited areas such as stream side, water side and forest areas. Therefore, recently the works of forest conservation and erosion control of environmental restoration on stream side tended to increased. The strategic prospects of environmental restoration in Japan were summarized as follows : 1. From the ecological point of view, we have to develop a certain method and technology in construction of forest conservation and erosion control to prevent environmental problem from erosion control works. 2. We have to restore not only a continuity of stream side forest from a primitive area to an estuary but also the stream side forest to preserve and restore a stream side vegetation on a primitive watershed areas. 3. We have to improve a method of construction or removal of a structure which were constructed in the stream to restore a water side environment and an interaction system for an integration on a forest land, stream, and erosion control. Additionally, we have to establish an integrated evaluation method and an enforcement system after investigation of influences on natural environment, stream, and forest etc. 4. We have to conduct an integrated research to investigate the ecosystem of stream side, and construct environmentally friendly water park and erosion control park which considered natural environment and its landscape. Additionally, we need to introduce and adopt a natural style stream construction method to restore a water side areas.

북한산국립공원 북동사면에서 동결융해침식 및 토사유출이 계류수질에 미치는 영향

박재현(Jae Hyeon Park) 한국산림과학회 2001 한국산림과학회지 Vol.90 No.4

This study was conducted to investigate influences of solifluction and sediment runoff on the stream water qualities during the spring season. The study sites were four points in the northeastern area of the Bukhansan National Park. And, field surveys were carried out in the spring of 1999, 2000 and 2001. The results of this study were summarized as follows; During the investigation period, the amounts of sediment caused by solifluction on stream side slopes in the downstream were 1.3∼1.7 times as large as those in the upstream. The pH of sediment caused by solifluction was a potential influence on the pH of stream water. Amounts of dissolved Cl^-, NO₃^- and SO₄^(2-) in stream water were proportion to the average amounts of Cl^-, NO₃^- and SO₄^(2-) in the sediment caused by solifluction. In the spring, the average pH of stream water was lower than the first class of the river water quality standard because of increasing chemical concentration as well as the contents of anions(Cl^-, NO₃^- and SO₄^(2-)) in the spring season. Also, the average electrical conductivity of water in downstream was about 2.3-3.3 times higher than that in upstream. The amounts of anions(Cl^-, NO₃^- and SO₄^(2-)) of water in downstream were about 1.2∼7.4, 1.1∼3.9, 1.1∼1.4 times higher than those in upstream, respectively. Therefore, these results showed that the water quality of downstream was worse than that of upstream. As a result of regression analyses, the linear and exponential equation of pH and water quantity was pH = 1.7926 × stream water quantity + 5.9577(R² = 0.46), and those of electrical conductivity and water quantity was EC = 34.417e^(3.6334 × stream water quantity(m/sec) (R² = 0.44).

복사효과를 고려한 기체-입자 직접접촉식 열교환기 해석

박재현,백승욱,권세진,Park, Jae-Hyeon,Baek, Seung-Uk,Gwan, Se-Jin 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.4

A direct contact heat exchanger using particle-suspended gas as a heat transfer medium is analyzed with an extended emphasis on the radiation, i. e., considering the radiation by both gas and particles. While the Runge-Kutta method is used for a numerical analysis of the momentum and energy equations, the finite volume method is utilized to solve the radiative transfer equation. Present study shows a notable effect by the gas radiation in addition to the particle radiation, especially when changing the chamber length as well as the gas and particle mass flow rate. When the gas and particle mass flow rate is raised, the gas temperature in the particle heater still increases as the gas absorption coefficient increases, which is different from the results for the small scale heat exchanger.

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.

소아 IgA 신병증의 예후에 관한 고찰

박재현,김병길,정현주,최인준,Park Jae-Hyun,Kim Pyung-Kil,Jeong Hyeon-Joo,Choi In-Joon 대한소아신장학회 1997 Childhood kidney diseases Vol.1 No.1

목적 : IgA 신병증은 다양한 임상 소견을 보일 수 있으며 초기에는 대부분 예후가 양호한 것으로 알려졌었으나 현재는 발병 20년후 20-30%가 말기 신부전증을 초래한다고 알려져 있다. IgA 신병증의 예후를 예측하기 위한 여러 조사에서 발병 초기의 심한 단백뇨, 고혈압, 조직 병리학 상의 심한 변화 등이 있을 경우 예후가 나쁘다고 하였다. 1996년 Yagame등은 IgA 신병증에서 새로운 조직 병리학적 분류를 하였고 WHO 분류 방법이 사구체 병변을 중심으로 한데 비해 세뇨관과 간질의 변화까지 포함하고 있어 이들의 분류 방법이 더 우수하며 추적관찰 결과 만성 신부전의 예후 인자로써 유용하다고 발표하였다. IgA 신병증에서 임상 증세, 검사 소견, WHO 및 Yagame 등의 조직 병리학적 분류 등과 추적 관찰시 만성 신부전과의 상관 관계를 알아보고자 하였다. 방법 : 1984년 1월부터 1996년 2월까지 소아과에 입원하여 신생검상 메산지움에 IgA가 현저히 침착되어 있어 IgA 신병증으로 진단된 환아 79명을 대상으로 평균 27개월의 추적관찰시 신 기능이 정상인군(73례)과 만성 신부전으로 진행한 군(6례)을 서로 비교하여 IgA 신병증에서의 예후 예측 인자에 대하여 알아보고자 하였다. 결과 : 1) 성별, 나이, 증상기간 등은 양군간 차이가 없었으나 내원시 고혈압이 있을 경우 만성 신부전으로의 진행이 많았다. 2) 내원시에 여러 임상 검사중 심한 단백뇨가 만성 신부전으로의 진행이 많았다. 3) WHO 및 Yagame 등의 조직 병리학적 분류 모두 소아 환자에서는 예후와의 관련을 찾을 수 없었다. 결론 : 이상의 결과로 보아 IgA 신병증 환아에서 내원시에 심한 단백뇨, 고혈압이 있을 경우 추적 관찰 결과 예후가 좋지 않았다. 그러나 본 연구의 경우 치료에 대한 평가가 이루어지지 않았고 대상 환아가 적었기에 향후 이를 포함하는 광범위한 연구가 진행되어야 할 것으로 사료된다. After the first description of IgA nephropathy by Berger in 1968, the prognosis of this disease was considered favourable. However recent studies have revealed that IgA nephropathy result in end stage renal desease in 25-30% by 20 years. Heavy proteinuria, hypertension, histological high class are regarded as poor prognostic factors. In 1996, Yagame et al reported the new histopathologic grading with a strong correlation between the grading, heavy proteinuria, high s-Cr level and renal survival. The aims of this study are to determine whether the pathological grading and other clinical parameters could contribute to predicting the outcome of this disease eventhough pediatric patients. Seventy nine patients (59 males, 20 females) with IgA nephropathy were examined. Patients were 2.08-15.17 years of age ($9.85{\pm}2.83$). The mean follow-up duration were $27{\pm}28$ months. Six of seventy nine patients progressed to chronic renal failure during the follow-up periods. High 24h urinary protein excretion at diagnosis were significantly higher in chronic renal failure patients (p<0.05). Hypertension at diagnosis were the significant associated factors in progression of chronic renal failure (p<0.05). Histological changes of IgA nephropathy in light microscopy were classified into five classes by WHO classification, four grades in Yagame's gradings. Among the seventy nine patients, 24 were as class 1, 30 as class 2, 23 as class 3; 4 as class 4, 0 as class 5 by WHO classification. 23 were classified grade 1, 31 as grade 2, 24 as grade 3, 1 as grade 4 by Yagame's grading. Among six patients who progressed to chronic renal failure, 1 clssified as class 1, 1 as class 2, 3 as class 3, 1 as class 4, 0 as class 5 by WHO Classification. 1 patients were classified as grade 1, 1 as grade 2, 3 as grade 3, 1 as grade 4 by Yagame's grading. (p>0.05) In conclusion, hypertension and heavy proteinuria at initial presentation were significantly associated with progression of chronic renal failure. The classification of WHO & Yagame's grading has no significant association with the progression of chronic renal failure in pediatric patients.

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.

이상 기후에 대비한 치수정책 방향

박재현,Park, Jae-Hyeon 한국수자원학회 2008 물과 미래(한국수자원학회지) Vol.41 No.12

국내 건축물 에너지 절감관련 정책 개선방안

박재현,홍태훈,Park, Jae-Hyun,Hong, Tae-Hoon 한국건설관리학회 2010 한국건설관리학회 논문집 Vol.11 No.4

기후변화협약에 따라 선진국을 중심으로 한 세계 30여 개국이 현재 온실가스 의무감축 대상국으로 지정되어있다. 우리나라도 2013 년부터 시작되는 2차 의무감축에 의해 의무감축 대상국에 지정될 가능성이 높다. 이에 최근 정부는 온실가스 저감을 위한 노력이 이루어지고 있으며 온실가스 저감 대책으로 건축물 에너지를 감소하는 것과 관련된 정책을 시행하고 있다. 그러나 국내의 관련 정책은 에너지 절감과 관련된 측면에 있어 해외 사례에 비하여 건축물 개선안 제공 및 건물 개보수시 전문가 검증과 같은 절차가 없다. 이에 따라 이러한 문제점을 보완하는 국내 정책의 개선방안이 정부 단위, 시도 단위의 정책을 기준으로 제시되었다. 하지만 본 연구에서 제시한 개선방안은 개략적인 개선방향으로 세부적인 내용은 향후 추가적인 연구가 필요할 것으로 판단된다. Today, more than thiry countries around the world are designated as a mandatory GHG(GreenHouse Gas) emissions country from the UNFCCC(United Nations Framework Convention on Climate Change). Korea is also possible to designate a mandatory GHG emissions country after Second mandatory emissions which will be started in 2013. Accordingly, Korea government has made efforts to reduce GHG and has enforced energy-related policies to deduce building energy. But there is no process such as providing of existing building improvement recommendations or expert verification for building remodeling in Korea energy-related policies compared with policies in other countries. For this reason, improvements of Korea which divided governments and city provinces are suggested. However suggested improvements are directions, so additional research is needed for detail methods.