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.

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.

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).

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).

생명이 살아 숨쉬는 친환경적 하천관리

박재현,Park, Jae-Hyeon 한국하천협회 2009 하천과 문화 Vol.5 No.2

산지관리법에 명시된 토석채취지의 환경·경관피해 및 재해저감 관련 법 조항의 이행실태 분석

박재현,김기대,배오장,Park, Jae-Hyeon,Kim, Ki-Dae,Bae, O-Jang 한국산림과학회 2017 한국산림과학회지 Vol.106 No.2

임업 중에서 시장과 정부의 규제가 충돌하는 대표적인 산업을 토석산업이라 할 수 있다. 특히, 경제적 측면과 환경, 경관, 재해측면을 동시에 고려하기 어려워 적정한 규제 및 규제개혁의 검토를 통해 관련 법 조항의 개정이 필요한 실정이다. 본 연구는 전국 54개소의 토석채취지를 대상으로 산지관리법에 명시된 환경 및 경관피해, 재해저감 실태에 대한 이행상태를 조사함으로써 토석채취자 및 관련 종사자의 준법정신을 확인하고, 차후 종사자를 대상으로 한 교육, 법률 개정에 있어 기초자료로 제공하고자 실시하였다. 산지관리법과 하위 법령의 총 22개 항목에 대하여 이행상태를 분석한 결과, 환경피해 저감 관련 법 조항은 이행상태가 대체로 양호한 것으로 나타났으나, 경관피해 저감 관련 법 조항은 대부분의 토석채취지에서 해당사항이 없는 것으로 나타났다. 이것은 산림경관을 중요시하는 사회적 분위기에 따라 토석채취로 발생하는 경관피해를 최소화하고자 한 결과로 판단된다. 아울러 재해방지를 위한 침사지 설치 이행상태는 양호한 것으로 나타났으나, 침사지와 연계된 방류수의 배출기준(수질오염방지)의 정립 및 제시를 통해 효율성을 높일 필요가 있을 것으로 판단된다. 따라서 본 연구결과와 차후 진전된 연구를 통해 다양한 법률이 적용되는 토석산업에 대해서는 보다 명확한 내용과 근거를 기반으로 현실성 있는 규제와 산업의 발전을 위한 정책이 수립되어야 할 것이다. Quarrying industry is typical industry that troubled between the market and government regulations in the forestry. Especially, it is difficult to consider aspects of economics and environment, landscape, disaster at the same time. Therefore, Quarrying industry need revised statutes according to regulatory reform and mitigation. This study conducted to provide basic data for regulatory reform and mitigation in quarrying industry. We surveyed 22 article of mountainous districts management act and lower statutes to employers and business interests on quarry 55 places in the Republic of Korea. As a result, fulfillment status of environmental damage reduction and disaster prevention were satisfactory. But fulfillment status of landscape damage reduction were not applicable. This result is due to the social mood that emphasizes the forest landscape. But there is need to improve the efficiency of grit chamber through present standard on effluent(water pollution prevention). In conclusion, policies should be established for realistic regulation and developed industry to quarrying industry.

환경친화적 무독성,무취,고효율 중금속 제거제

박재현,장병만,Park, Jae-Hyeon,Jang, Byeong-Man 한국환경기술인연합회 2007 환경기술인 Vol.24 No.9

마르코프 랜덤필드를 이용한 무관리형 화상분할 알고리즘

박재현,Park, Jae-Hyeon 한국정보처리학회 2000 정보처리논문지 Vol.7 No.8

In this paper, a new unsupervised image segmentation algorithm is proposed. To model the contextual information presented in images, the characteristics of the Markov random fields (MRF) are utilized. Textured images are modeled as realizations of the stationary Gaussian MRF on a two-dimensional square lattice using the conditional autoregressive (CAR) equations with a second-order noncausal neighborhood. To detect boundaries, hypothesis tests over two masked areas are performed. Under the hypothesis, masked areas are assumed to belong to the same class of textures and CAR equation parameters are estimated in a minimum-mean-square-error (MMSE) sense. If the hypothesis is rejected, a measure of dissimilarity between two areas is accumulated on the rejected area. This approach produces potential edge maps. Using these maps, boundary detection can be performed, which resulting no micro edges. The performance of the proposed algorithm is evaluated by some experiments using real images as weB as synthetic ones. The experiments demonstrate that the proposed algorithm can produce satisfactorY segmentation without any a priori information. 본 논문에서는 새로운 무관리형 화상분할 알고리즘이 제안된다. 제안된 알고리즘은 화상에 내재되어 있는 구조 정보를 모델링하기 위하여 마르코프 랜덤필드의 특성을 이용하고 있다. 텍스쳐 화상은 정상상태의 가우스 마르코프 랜덤필드가 2차원의 격자구조 위에 실현된 상태로 간주되었으며 2차의 비순차근방을 갖는 조건부 자기회귀함수를 이용하여 모델링 되었다. 화상의 경계면 감출을 위하여 마스크로 선택된 두 영역에 대한 가설검정이 수행된다. 이 방법은 선택된 두 영역이 같은 종류의 텍스쳐라고 가정을 한 후 조건부 자기회귀모델의 매개변수를 최소평균제곱오차 측면에서 추정한다. 가설이 거절되면 두 영역의 상이함을 측정한 그 값이 선택된 영역에 누적된다. 이와 겉은 방법을 통하여 잠재적인 경제지도가 얻어지며, 이것을 통하여 여러 종류의 텍스쳐 화상의 분할이 미세오류경계 없이 이루어지게 된다. 제안된 알고리즘의 성능은 인공화상 뿐만 아니라 실제의 자연화상을 이용한 실험을 통하여 입증되었으며 일체의 사전정보 없이도 만족할 만한 결과를 보여 주었다.

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.

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.