제주도 동부 연안역의 생물생태학적 기초연구(ll) 우도주변 식물 플랑크톤 군집동태와 일차생산력

이준백,좌종헌,고유봉,최영찬 濟州大學校 基礎科學硏究所 1994 基礎科學硏究 Vol.7 No.1

제주도 동부연안역인 우도해역에서 1991년 9월부터 1992년 6월까지 격월로 식물플랑크톤 동태와 일차생산력의 수평적 및 수직적 정성, 정량자료를 분석하였다. 조사기간중 출현한 총 출현종수는 89종이며 규조류가 가장 많았고 그 외 와편모조류와 규질편모조류가 출현하였다. 이중 Chaetoceros diadema, C. socialis, Skeletonema costatum, Prorocentrum micans가 계절적 천이경향을 보이면서 우점하였다. 개체수의 월변화는 4,116∼588.68cells/l의 범위로써 11월에 최소치, 3월에 최대치를 보였다. 개체수의 수직분포는 수괴의 수직혼합 및 성층과 밀접한 관계를 보이고 있다. 수층의 평균 일일 일차생산력은 연안역 (정점1)에서 210.17(4.34∼588.68)mgC/m²/day, 외해역(정점7)에서 309.35(4.25∼804.55)mgC/m²/day를 나타내었다. 미세식물플랑크톤 (<20㎛)의 총 일차생산력에 대한 비율은 연안에서 37.6%와 외해에서 67.6%를 차지하며 외해역에서 더 높은 생산력을 보였다. 식물플랑크톤의 동화계수는 표층에서 0.17∼12.05mgC/mgChl-a/hr의 범위로써 춘계와 하계에서 높았다. 와편모조류중 Prorocentrum micans의 대발생은 하계의 저염현상과 밀접한 관계를 보였다. This study has been carried out to understand the dynamics and primary productivity of phytoplankton around U-do, eastern part of Cheju Island from September 1991 to June 1992. During the survey a total of 89 species were identified, comprising mainly diatom, and dinoflagellate and silicoflagellate as minority. Of these, Chaetoceros diadema, C. socialis, Skeletonema costatum, Prorocentrum micans predominated with seasonal succession. The cell number ranged from 4,116 to 812,748cell/l, showing the minimum in November and the maximum in March. The vertical distribution of cell number related closely with the vertical mixing and stratification of the water mass. The mean depth-integrated primary productivity was 210.17 (4.34∼588.68)mgC/㎡/day at st.1 (nearshore) and 309.36 (4.25∼804.55)mgC/㎡/day at st. 7 (offshore). The nanoplankton fraction (<20㎛)accounted for 37.4% and 67.6% of total primary productivity at st. 1 and st.7, respectively, representing higher productivities at offshore than at nearshore. Assimilation number by phytoplankton at the surface ranged from 0.17 to 12.05mgC/mgChl-a/hr, showing higher values in spring and summer. Dinoflagellate bloom of Prorocentrum micans may have a close relationship with the presence of lower salinity in summer.

제주도 해안선 주변 부착규조류의 종조성 및 분포

이준백,좌종헌,김일수 제주대학교 해양연구소 1991 해양자원연구소연구보고 Vol.15 No.-

The distribution and species composition of periphytic diatoms around the coast line of Cheju Island have been investigated at four costal stations from April 1991 to June 1991. During the study period, 71 taxa periphytic diatoms are collected, of which are composed of 11 families, 32 genera, 59 species. 12 unidentified species. More than 20% of periphytic diatoms are occupied by the 12 abundant species. Cucconeis scutellum, Cylindrotheca closterium, Licmophora abbreviata are observed in all the coasts and all the attached substratum, and predominated more than 50% so that these species are the most typical dominant species troughout the study period.

평행봉 Tippelt 기술 숙련도에 따른 운동역학적 비교

백훈식 ( Hun Sig Back ),박종철 ( Jong Chul Park ),김민수 ( Min Soo Kim ),박종훈 ( Jong Hoon Park ),안완식 ( Wan Sik An ),백진호 ( Jin Ho Back ),윤창선 ( Chang Sun Yoon ) 한국스포츠정책과학원(구 한국스포츠개발원) 2010 체육과학연구 Vol.21 No.3

이 연구는 평행봉 Tippelt 기술 숙련도에 따른 운동역학적 비교를 통해 동작의 주요 요인을 규명하고 기술 수행을 위한 기초 자료를 제공하고자 하였다. 동작을 완벽하게 수행한 국가대표 체조선수 2명을 우수그룹(E), 동작에서 감점요인이 발생한 체조선수 2명을 비우수그룹(NE)으로 분류하여 3차원 동작분석과 대흉근, 승모근, 삼각근, 상복직근, 하복직근, 대퇴직근, 척추기립근, 광배근의 근육활동을 비교 분석하였다. 실험 결과, E가 NE보다 스윙,비행구간에서의 소요시간이 긴 것으로 나타났고, E의 경우 신체중심을 전방으로 빠르게 이동시키면서 전후의 이동폭이 큰 것으로 나타난 반면, NE의 경우 수직으로의 빠른 이동으로 수직 이동폭이 큰 것으로 나타났다. 스윙구간에서 고관절의 굴신폭과 고관절,동체전경 최대각속도는 NE가 큰 것으로 나타났지만, 비행구간에서 고관절의 굴신폭과 고관절,동체전경 최대각속도는 E가 큰 것으로 나타났다. 근육활동의 분석 결과, 스윙구간에서 E는 상복직근과 하복직근이 가장 큰 것으로 나타났고, NE는 삼각근과 하복직근이 가장 크게 나타났다. 비행구간에서는 E의 경우 상복직근과 대퇴직근이 가장 큰 것으로 나타났고, NE의 경우 삼각근과 상복직근이 가장 큰 것으로 나타났다. Tippelt 동작의 완성도를 높이기 위해서는 하강스윙 시 상체를 이용하기보다 복직근을 이용한 하강으로 고관절을 굴곡시킨 후 전방으로 크게 이동하면서 역회전 동작이 이루어지도록 유도하여야 하며, 비행구간에서도 상체를 일으키기 보다는 하체를 끌어올리는 동작이 이루어질 수 있도록 하여야하는 것으로 나타났다. This study conducts biomechanical comparison according to Tippelt technique proficiency in parallel bars in order to examine the chief factors of the movement and provide foundational data for conducting the technique. Two persons who can accomplish the motion perfectly were classified as the excellent athletes(E), and the other two persons who have the cause of subtract points during motion were classified as the group of non-excellent athletes(NE), so 3D motion analysis and comparison analysis of muscle activity between pectoralis major, trapezius, deltoid, upper abdominal, lower abdominal, rectus femoris, erector spinae, litssimus doris etc. were conducted. It is shown that E takes more time in the swing or flight phase than NE. While E moves the center of mass forward rapidly and shows great back and forth shift width, NE indicates great vertical shift width with the fast vertical movement. It is also shown that although NE shows greater flection and extension width of hip joint and the maximum angle speed of hip joint and trunk slope in the swing phase, E indicates greater flection width of hip joint and the maximum angle speed of hip joint and trunk slope in the flight phase. According to the result of analyzing muscle activities, in the swing phase, E shows greatest upper and lower rectus abdominal muscle activities while NE indicates greatest deltoid and lower abdominal muscle activities. In the flight hase, E shows greatest upper rectus abdominal muscle and rectus femoris muscle activities whereas NE indicates greatest deltoid and upper abdominal muscle activities. In order to enhance the completeness of Tippelt technique, it is necessary to flex hip joint with the descent using rectus femoris muscle rather than the upper body at the descent swing and move forward greatly to induce backspin movement. In the flight phase, it is also shown that it is needed to conduct movement drawing the lower body instead of raising the upper body.

Productivity Improvement Strategies Using Simulation in Offshore Plant Construction

Back, Myung Gi,Woo, Jong Hun,Lee, Philippe,Shin, Jong Gye Society of Naval Architects and Marine Engineers 2017 Journal of ship production and design Vol.33 No.2

<P>Since the global financial crisis of 2008, the global shipbuilding industry has changed considerably and placed major Korean shipbuilding companies (mostly common carrier builders) in a precarious position. Current competitiveness in the global shipbuilding industry has been attracted by low labor costs in China. The Korean shipbuilding industry, with heavy industry as the central figure, is attempting to increase its share of offshore plant construction to develop deep-sea resources. This highlights the most outdated part of offshore plant in Korea, the development technology, which includes front-end engineering development and deep-water floaters, unlike in more advanced companies in the United States, where development technology has advanced rapidly. This has prompted the Korean government to invest most of its R&D funds in the areas of product and equipment development. However, mega shipbuilders such as Samsung, Hyundai, and Daewoo have incurred considerable losses at construction stages because of major delays in production. By contrast, international engineering companies have supported development engineering. The considerable financial losses incurred by mega shipbuilders are believed to be caused by a lack of quality management with respect to the massive production quantities and complexities involved in outfitting topside structures. This study investigates a strategy to advance production management specialized for the offshore plant business and describes a robust and sustainable technical roadmap based on current information technologies (IT) and simulation-based management methods.</P>

대전시 지하상가의 공기질 평가에 관한 연구

정헌준(Hun-Jun Chung),백승화(Seung-Hwa Back),김종헌(Jong-Heon Kim),김홍목(Hong-Mok Kim) 한국환경관리학회 1998 環境管理學會誌 Vol.4 No.2

안면골 골절에 관한 임상적 연구

고백진,남종훈,김태영,이용찬,조병욱 大韓顎顔面成形外科學會 1989 Maxillofacial Plastic Reconstructive Surgery Vol.11 No.1

This study is based on 247 patients(348 cases) with facial bone fracture who were admitted to the department of oral and maxillofacial surgery, Kangnam sacred heart Hospital during the period of Jan. 1983 through sep. 1988. The patients with mandible fracture were analysed with the following items such as complications with treatment method undertaken : Bicortical osteosynthesis vs Monocortical osteosynthesis, advantages and Disavantages. The results obtained are as follows : 1) The most common age groups for the facial bone fracture were 20 years 2) The ratio of Men to women was 5 : 1 3) The most frequent location of facial bone fractures was the Mandible (76.7%), Maxillae(10.6%), Zygoma(9.5%), Nasal bone(3.2%) 4) The ratio of Mandible to Maxillae was 7.2 : 1 5) In mandible fractures, the most frequent fracture site was Symphysis(48.7%) 6) In maxilla fractures, the most frequent case was Le fort III fracture(51.4%), followed by Le fort I fracture(29.7%), Le fort II fracture(18.9%) 7) The main contributing causes of facial bone fractures were Traffic Accident(37.7%), Fight(31.6%), Accident(27.5%) 8) In open reduction methods of mandible fracture, the frequency of postop, malocclusion was 15% in interosseous wiring 7% in Bicortical osteosynthesis, 3% in Monocortical osteosynthesis. The miniplates show advantages over other forms of fixation, in that they are malleable and easy to insert, they achieve rigid fixation and stability.

도마운동 Cuervo Stretched 동작의 국면별 역학적 분석

박종훈 ( Jong Hoon Park ),윤득헌 ( Deuk Hun Yoon ),백진호 ( Jin Ho Back ),김충태 ( Chung Tae Kim ),김동민 ( Dong Min Kim ),한충식 ( Chung Sik Han ),한윤수 ( Yoon Soo Han ) 한국스포츠정책과학원(구 한국스포츠개발원) 2002 체육과학연구 Vol.13 No.3

본 연구의 목적은 도마 Cuervo Stretched 동작의 도약 국면별 운동역학적 변인의 차이가 제 2비약의 공중 회전운동과 착지 제어에 어떠한 영향이 미치는가를 규명하는데 있다. 이를 위해 국가대표 남자 기계체조 선수 3명을 대상으로 고속 비디오 카메라를 이용한 3차원적 영상분석과 구름판과 도마에 가해지는 힘의 측정을 통하여 운동역학적 변인들을 비교 분석한 결과 다음과 같은 결론을 얻었다. 1. 발구름 시 우수한 동작일수록 고관절을 좁히면서 구름판에 접근하고 신체중심을 앞으로 빠르게 이동시키며 동시에 견관절을 빠르게 좁혀주어 구름판 이륙 시 신체를 앞으로 많이 숙이는 것으로 나타났다. 이는 제 1비약의 체공시간을 짧게 하고 다리를 뒤로 차주는 동작을 용이하게 하여 신체의 회전 속도를 빠르게 유발시키는 것으로 나타났다. 2. 도마 접촉 국면 시 견관절각의 큰 신전과 함께 대퇴분절의 빠른 각속도 유지는 도마 접촉 시간을 짧게 하고 수직성분을 강화시키며 도마 이륙각을 수직에 가깝게 유지시킴으로서 제 2비약의 체공 높이와 거리를 증가시키고 제 2비약의 정점에서 공중 회전거리를 많이 확보할 뿐만 아니라 도마에 가해지는 힘을 크게 하여 탄성을 일으키는데 큰 기여를 하는 것으로 나타났다. 3. 발구름 시 강한 수평반력에 따른 제 1비약의 수직성분 강화는 도마 접촉 시 소요시간을 길게 하고 견관절의 각변위를 작아지게 만드는 것으로 나타났으며, 이는 신체를 앞으로 쓰러지게 하고 수직속도를 약화시킴으로서 제 2비약의 도약력 상승과 공중 회전운동에 나쁜 영향을 제공하는 것으로 나타났다. 또한 공중 회전운동 초반의 소극적인 움직임은 뒤늦게까지 회전운동의 강화에 치중하게 되어 착지 시 좁은 고관절각과 낮은 중심고를 제공하여 불안정한 착지 동작을 유발시키는 것으로 나타났다. This paper aims to closely examine how the difference of kinetic variables by take-off state of horse vaulting Cuervo stretched motion would have an effect on the rotation of the post flight and landing. For this, to three male national artistic gymnastics athletics a three dimensional image analysis using the high speed video camera was made and the force applied to the board was measured, and as a result of comparing and analyzing their kinetic variables, following conclusion was obtained. 1. It was indicated that more skilful motion at contact board approaches the contact board with hip joints in narrow, and moves cog. forward rapidly, and narrows shoulder joint, resulting in making the body bending forward at take-off state. In was indicated that this shortens the duration of pre-flight, and facilitates kicking motion, resulting the rotation velocity of the body. 2. Indicated that at the phase of contacting horse vaulting, large extension of shoulder joint angle and maintenance of rapid angular velocity shortens the contact time of horse vaulting, consolidates vertical components, keeps the take-off angle of horse vaulting close to the vertical state, increases the post-flight height and distance, secures rotation distance in the airborne at the peak of the post-flight, and generates elasticity at horse vaulting. 3. It was indicated the consolidation of the vertical component in the pre-flight according to strong horizontal reaction power prolongs required time at the time of contact horse vaulting, and reduces the angular displacement of shoulder joint, which makes the body fall ahead, and weakens vertical velocity, and provides disadvantage to increase and rotation motion of the take-off power at the post-flight, and the initial passive motion of air rotation motion focuses on the consolidation of rotation motion till late, so provides narrow hip joint angle and low cog. height at landing, resulting in unstable landing motion.

Thermal Treatment and Condensation for Mercury Recovery from High Contained Mercury Waste

( Seung-ki Back ),( Jin-ho Sung ),( Bup-mook Jeong ),( Ha-na Jang ),( Yong-chil Seo ),( Jeong-hun Kim ),( Ki-heon Kim ),( Young-lan Kim ),( Jong-soo Jurng ),( Min-su Kim ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-

This study provides an estimation result of amount of recoverable mercury using UNEP Toolkit, and a experimental result of thermal mercury reduction for inventing a mercury recovery technology from the sludge which contains high concentration of mercury. By using UNEP methodology, the source category of primary metal production was found to be the maximum mercury discharge source in UNEP Toolkit mercury categories. According to those results, thermal treatment experiment was conducted using mercury containing waste in primary metal category. Wastewater sludge from a primary metal facility was used as a sample for thermal degradation experiment. In order to recover purified elemental mercury, the further researches of distillation and refining technology would be required.

친환경교통지구 활성화를 위한 구조형성 요인분석

김종백(Kim, Jong Back),민성훈(Min Seong Hun) 대한부동산학회 2020 大韓不動産學會誌 Vol.38 No.3

본 연구는 친환경 교통개선지구의 효율적인 관리를 위해 소프트웨어적 측면 및 물리적 측면과 지구의 활성화 구조형성에 대한 연구를 실시하였다. 본 연구를 위해 명동 보행자 전용도로 및 연세로 대중교통 전용지구를 연구의 대상지로 선정하였다. 우선 설문조사 실시 전에 친환경 개선지구와 관련된 선행연구의 평가변수들을 검토하여 친환경 교통개선지구의 활성화에 영향을 미치는 21개의 평가변수를 도출하였다. 도출된 평가변수를 물리적 요인 및 소프트웨어적 잠재변수로 구분하였으며 추가적으로 활성화 잠재변수를 설정하였다. 이를 기반으로 친환경 교통개선지구 활성화의 구조형성 및 영향요인을 파악하고자 하였다. 친환경 교통개선지구 구조형성 분석 결과, 친환경 교통개선지구의 활성화 구조형성은 소프트웨어적 요인에서만 형성되었으며 물리적 요인의 경우에는 기각되었다. 또한 소프트웨어적 요인에서 영향력이 높게 나타난 측정변수들을 살펴보면, 거리의 이벤트, 공원과의 연계성, 인근 지역과의 연계성, 거리의 이미지 등이 높게 나타났다. 반면에 활성화 요인과 관련된 영향요인을 살펴보면, 상권, 대중교통 등에서 높게 나타났다. This study is for efficient management of eco-friendly traffic improvement zones. Specifically, a study was conducted on the formation of the structure of activation of the earth by software aspects and physical aspects. For this study, Myeong-dong pedestrian-only roads and Yonsei-ro public transportation-only zones were selected as the sites for research. Prior to conducting the survey, the assessment variables of prior research related to eco-friendly improvement zones were reviewed. As a result, 21 evaluation variables were derived that affected the revitalization of eco-friendly traffic improvement zones. The derived valuation variables were then divided into physical factors and software potentials. Additionally, activation potentials have been set. Based on this, it was intended to identify the structural formation and the factors influencing the revitalization of eco-friendly traffic improvement zones. As a result of the analysis of the structure formation of eco-friendly traffic improvement zones, the active structure of eco-friendly traffic improvement zones was formed only by software factors. On the other hand, physical factors were rejected. In addition, if you look at the variables that showed high influence in software factors, the events of the street, the connection with the park, the connection with the nearby area, and the image of the street were high. On the other hand, the impact factors related to activation factors were high in commercial districts, public transportation, etc.

내장형 철동신호제어시스템의 정량적 RAMS 평가에 관한 연구

신덕호(Ducko shin),이종우(Jong-woo LEE),김종기(Jong-ki KIM),이영훈(Young-hun LEE),김백현(Back-hyun KIM),이기서(Key-soe LEE) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-

This paper is presented to a theory comparing each different systems by quantitatively analyzing reliability, availability, maintenance and safety. Reliability R(t) produced by the method here is used for MTBF calculation of system as reliability of normal state. It is possible to produce the failure rate of unsafety state through modelization of system only to use the failure rate, after yielding the failure rate of failure mode to each un safety sate in case that unsafety state is defined with the function of systems applied.