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- 저자 : 박성학(Seong-Hak Park) (검색결과 23 건)
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수위변동 비탈면 녹화용 식물 선정을 위한 Iris속 4종의 침수기간에 따른 생육특성
박성학 ( Seong Hak Park ),박종민 ( Chong Min Park ),오현경 ( Hyun Kyung Oh ) 한국환경생태학회 2008 한국환경생태학회지 Vol.22 No.6
댐호, 저수지, 하천 등 수위변동이 있는 비탈면의 녹화용 식물재료를 선발하기 위하여 내습성을 지닌 4종류의 Iris속 식물을 대상으로 완전침수와 부분침수 조건에서 침수기간별로 생존 및 생장특성 등을 비교 조사하였다. 생존율과 생장상태를 기준으로 한 내침수성은 노랑꽃창포>꽃창포>부채붓꽃>붓꽃의 순서로 나타났다. 특히, 노랑꽃창포는 120일까지의 완전침수 조건에서 생장장해를 입기는 하지만 생존율이 높았고 지속적으로 양호한 생장을 하였으며, 부분침수조건에서는 침수기간이 증가할수록 생장이 양호한 것으로 보아 내침수성이 강한 것으로 확인되었다. 붓꽃, 부채붓꽃, 꽃창포는 완전침수조건에서 다소 많은 생장장해를 입으며 90일 이후에 고사되었으나, 내침수성이 비교적 강한 것을 확인할 수 있었으며, 수위변동에 따라 생장회복이 가능할 것으로 판단된다. 본 시험을 통해 댐호의 저수 비탈면과 각종 저수구역 내의 식생공사용으로서 노랑꽃창포, 꽃창포, 부채붓꽃, 붓꽃의 이용가능성을 확인하였다. This study was carried out to select the utilizable plants for the slope revegetation in dams, lakes and streams. In this study, 4 Iris species were investigated for their survival and growth characteristics in the complete and partly flooding condition with various flooding periods. The results are as followings; Iris pseudoacorus showed the highest flooding tolerance based on survival rate and growth condition. Iris ensata var. spotanea, I. setosa and I. nertschinskia followed after Iris pseudoacorus in the order of flooding tolerance. When I. pseudoacorus were completely submerged in the water, their growth was disturbed but they did not die up to 120 days. On the other hand, I. nertschinskia, I. setosa and I. ensata var. spotanea showed a significant growth disturbance in the complete water submergence and died in 90 days. This explained that they were relatively strong in flooding tolerance. They are considered to grow back to normal with some changes of water level.
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GA를 이용한 제한된 설치환경 하에서의 소나 투하 및 인양 장비의 최적화
박성학(Seong-Hak Park),정원지(Won-Jee Chung),김효곤(Hyo-Gon Kim),최종갑(Jong-Kap Choi) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.5
Cranes are generally used to drop or lift equipment or materials. The present study focuses on equipment used for dropping and lifting the sonar system for undersea exploration. This study deals with a GA-based MATLAB<SUP>®</SUP> simulation for the design optimization of a new overboarding prototype with a two degree-of-freedom mechanism, including a parallelogram link, which is efficient in sonar system operation and maintenance. First, the strengths and weaknesses of the existing overboarding mechanisms are analyzed. The new mechanism to solve these problems is then suggested. For the proposed mechanism, the GA-based MATLAB<SUP>®</SUP> simulation technique is applied to the proposed mechanism to optimize the link lengths and the actuator lengths. By doing this, the mechanism cannot interfere in the hull’s internal environment. Hence, the work range of motion (ROM) is satisfied, and good torque-angle properties are obtaind. The developed technology will be helpful in calculating the maximized output torque of the actuator for the application in practice using a similar type of the proposed mechanism.
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박종민 ( Chong Min Park ),김성원 ( Seong Won Kim ),박성학 ( Seong Hak Park ) 한국환경생태학회 2009 한국환경생태학회지 Vol.23 No.4
전라북도 고창군 상하면 구시포해수욕장 주변에 위치한 곰솔 방풍림을 대상으로 곰솔림의 생장특성을 조사 하였는바, 그 결과를 요약하면 다음과 같다. 곰솔림의 토양은 모래의 함량이 많은 사토이고, 약산성(pH 5.73)이며, 토양염분농도는 1.42dS/m이다. 곰솔의 흉고직경, 수고, 수관폭, 형상비(수고/흉고직경)는 저밀도 임분, 중밀도 임분, 고밀도 임분의 순으로 양호하였고, 절간생장량은 고밀도 임분일수록 많았다. 특히 저밀도 입목밀도가 낮을수록 수관폭이 크고, 형상비 60 이하인 수목의 비율이 많았다. 이것은 입목밀도가 낮을수록 수목이 건전하게 생장하고 있음을 나타내는 것이다. 많은 수목이 여러 방향으로 기울어져 생육하고 있는데, 이것은 대부분의 수목이 생장 초기 단계에 바람의 영향을 받은 것이고 일부는 태풍의 영향을 받은 것으로 분석되었다. 수목의 기울기 방향의 분포율이 이 지역의 주풍방향과 상관성이 있는 것으로 분석되었다. 이 지역의 모래언덕과 곰솔림 내부에는 총 81분류군의 관속식물이 생육하고 있으며, 목본식물(24분류군)보다 초본류(57분류군)가 더 많았다. 사구식물의 경우 모래언덕이 잘 발달해 있는 명사십리 구역에는 10종류가 출현하였는데, 방파제 축조로 인해 모래언덕이 형성되지 않은 구시포해수욕장 구역은 3종의 사구식물만이 간헐적으로 출현하였다. 이 지역의 곰솔림이 건전하게 성장하고 유지되어 해안방풍림으로서의 기능을 충분히 발휘할 수 있게 하기 위해서는 고밀도와 중밀도 임분에 대한 적정한 간벌이 필요한 상태이다. The growth characteristics of Pinus thunbergii windbreak forest around Goosipo Beach, Sangha-Myon, Gochang-Gun, Jeollabuk-Do have been investigated, and the results are summarized as follows. The soil in the site was light acid sand with pH 5.7, and the mean sodium concentration of soils was 1.42dS/m. The tree diameter, height, crown width, and shape ratio(Height/DBH) were better with tree density was coming lower. Especially, the rate of shape ratio under 60 was more in sites with low tree density. This demonstrated that the trees have grown more soundly when the tree density was lower. The direction of main winds and distribution ratio of tree inclination had a correlation. The inclined trees are seemed to be influenced by main winds when they were younger and by Typhoon partly. Eighty one vascular plant species were found in the sites, and more number of herbaceous plants (57 taxa) lived there than woody plants (24 taxa). And more plant species of dune were found at the site where dune have developed well. Some thinning works need at high tree density areas in order to ensure effects of coastal windbreak.
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박종민 ( Chong Min Park ),마호섭 ( Ho Seop Ma ),강원석 ( Won Seok Kang ),오경원 ( Kyeong Won Oh ),박성학 ( Seong Hak Park ),이성재 ( Sung Jae Lee ) 경상대학교 농업생명과학연구원(구 경상대학교 농업자원이용연구소) 2010 농업생명과학연구 Vol.44 No.4
전라북도지역을 산사태 발생지 182개소를 대상지로 선정하여 강우의 특성 및 다양한 환경인자 별로 조사하여 산사태발생 특성을 분석하였다. 전라북도 지역을 산사태 발생 수는 총 182개소였으며, 산사태 발생 평균면적은 1,859㎡, 평균 발생토사량은 4,418㎥, 평균 길이와 폭은 각각 139m와 13m로 나타났다. 산림환경인자별 산사태 발생 빈도가 높은 인자는 사면경사도 21~30°, 북쪽사면, 해발 401m~500m 이상, 종단사면 (오목), 횡단사면 (오목), 침엽수, 화성암, 토심은 15cm이하, 하천차수는 1차, 사면위치 (산복), 산사태 유형 (선상), 임종 (인공림), 수고 11m~15m, 흉고직경 중경목(17cm이상)에서 산사태 발생이 높은 것으로 조사되었다. 전라북도 지역의 산사태 발생면적과 산림환경인자와의 상관을 분석한 결과는 횡단사면 (볼록), 사면위치 (산정), 표고 (501이상), 임상 (침엽수), 모암 (퇴적암), 흉고직경 (17cm이상)과는 1% 수준 내에서 정의상관관계를 보였고, 경사 (31~40°), 모암 (화성암), 흉고직경 (6~16)에서 1% 수준 내에서 부의 상관관계를 보였다. This study was carried out to analyze the landslide characteristics and forest environment factors on the landslide area of Jeonlabuk-do province in korea. The results obtained from this study were summarized as follows; The total number of landslide occurrence was 182 areas. The average area of landslide scar was 1,859m 2, average length of the landslides was 139m, average width was 13m. The landslides were highly occurred in igneous rock and coniferous. And also, slope gradient was 21~30°, aspect was NE, altitude was 401~500m, vertical and cross slope was concave (凹), stream order was 1 order, soil depth was 15m below, landslide type was linear, forest type was artificial. The relationship between landslide area and environmental factors was a positive correlation with cross slope (convex), position (upper), altitude (501m), forest type (coniferous), parent rock (sedimentary rock), D.B.H. (over 17cm), but was negative correlation with slope gradient (31~40°), parent rock (igneous rock), D.B.H. (6~16cm).
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오현경 ( Hyun Kyung Oh ),박성학 ( Seong Hak Park ),양주영 ( Ju Yung Yang ) 한국녹지환경디자인학회 2008 녹지환경학회지 Vol.4 No.3
The flora of the Sojeokgol in Byunsan peninsula was listed 135 taxa; 60 families, 101 genera, 121 species, 10 varieties and 4 forms. Divided into woody plants were 70 taxa (51.9%) and Herbaceous plants were 65 taxa (48.1%). Based on the list of rare plants by the Forest Research Institute, Tricyrtis dilatata (Preservation priority order: No. 97), Viola albida (No. 202) and based on the list of Korean endemic plants, Lespedeza maximowiczii for. tomentella, Weigela subsessilis were recorded. Specific plant species by floral region were total 15 taxa; 2 taxa (Acer palmatum and Callicarpa mollis) in Class Ⅲ, 13 taxa (Arisaema ringens, Cephalanthera falcata, Quercus variabilis, Celtis bindii var. heterophylla, Aconitum jaluense, Mallotus japonicus, Meliosma myriantha, Meliosma oldhamii, Grewia biloba var. parviflora, Eurya japonica, Vaccinium oldhami, Ardisia japonica and Lonicera praeflorens) in Class Ⅰ. The naturalized plants in the surveyed sites were 4 families, 7 genera, 6 species and 1 varieties 7 taxa (Rumex obtusifolius, Phytolacca americana, Oenothera biennis, Aster subulatus var. subulatus, Erigeron annuus, Conyza canadensis and Sonchus oleraceus). Naturalization rate was 5.2% of all 135 taxa of vascular plants.
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김희율 ( Hee Yul Kim ),박성학 ( Seong Hak Park ),이상현 ( Sang Hyun Lee ),박종민 ( Chong Min Park ) 한국산림과학회 2013 한국산림과학회지 Vol.102 No.4
This study looked over the laws and regulations related to forestry workers to analyze the safety accident rates for the past five years (2006-2010), and to suggest improvement plans to reduce the safety accident rates of forestry workers. Findings from comparing information obtained from data are outlined below. The safety accident rates had gradually increased in the forestry fields until 2010, but nowaday it is on the decline. Furthermore, the safety accident rates in the field of forestry were still serious compared to those in the other industrial fields as from 2.1 to 5.1 times. In the results, the workers were especially vulnerable to safety accidents when they fell under the following categories: when falling; within 29 to 90 days after starting the work; over 60 years old; less than one month of service; October; Wednesday; 11 a.m.; and the nether limbs of the body. In the case of Jeollabuk-do, it was reported that more than half of victims did not have any training in safety.
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