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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.
禹保命,朴在鉉 서울대학교농과대학농업개발연구소 1989 서울대농학연구지 Vol.14 No.1
To examine soil erosion phenomena by freeze-thaw mechanism, soil moisture, underground soil temperature, soil hardness, and air temperature were investigated during two successive winter seasons(Jan. 16-Mar. 25, 1988 and Dec. 15, 1988-Mar. 20, 1989) for the designed cut slopes at the Colleage of Agriculture, Seoul National University, Suwon, Korea. The results of this study should be summarized as follows; 1. Soil moisture of northern slope was higher than that of southern slope. 2. Soil hardness during the freezing-thawing period was higher than during the thawing period. Mean soil hardness of the northern slope (18.84, 18.12㎏/㎠) was higher than that of southern slope (4.59, 4.32㎏/㎠) during the freezing-thawing period, but northern slope (1.00, 1.21㎏/㎠) had a lower value than southern slope (2.38, 2.24㎏/㎠) during the thawing period. 3. Mean amounts of soil erosion of the southern slope (8,703, 3,576㎤/㎡) during the examined periods were higher than those of northern slope (7,024, 2,693㎤/㎡). 4. Freeze-thaw erosion phenomena were influenced by soil moisture and variation of soil temperature. 5. From the results of this study the amount of soil erosion by freesz-thaw mechanism was greater at the southern slope than at the northen slope. It must be taken into consideration of lowering the gradient of southern slope than that of northern slope in designing a forest road.
고지환,박현직,김보미 금오공과대학교 2006 論文集 Vol.27 No.-
In this paper, Gap filler antenna for satellite DMB(Digital Multimedia Broadcasting) is designed. The antenna consists of radiation patch, crossed aperture and feed network. The patch is square to generate circular polarization. The feed network drives- the crossed slots with equal amplitude and a 90° phase shift and provides a matched input to the antenna. The designed antenna shows gain of 6.6 dBi and axial ratio of within 4 dB over 2.605-2.655 GHz.
Bo Eun Park,배명환,Hyeon Jeong Kim,Yoon Jung Park,Hong Nyun Kim,장세용,이장훈,양동헌,박헌식,조용근,Shung Chull Chae 영남대학교 의과대학 2020 Yeungnam University Journal of Medicine Vol.37 No.4
Background: This study aimed to investigate the incidences of and risk factors for perioperative events following anticoagulant discontinuation in patients with non-valvular atrial fibrillation (NVAF) undergoing non-cardiac surgery. Methods: A total of 216 consecutive patients who underwent cardiac consultation for suspending perioperative anticoagulants were enrolled. A perioperative event was defined as a composite of thromboembolism and major bleeding. Results: The mean anticoagulant discontinuation duration was 5.7 (±4.2) days and was significantly longer in the warfarin group (p