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      • KCI등재

        가방 하중의 크기와 방식에 따른 척추 정적 자세의 변화

        박용현,김영관,김윤혁,Park, Yong-Hyun,Kim, Young-Kwan,Kim, Yoon-Hyuk 대한의용생체공학회 2011 의공학회지 Vol.32 No.3

        The aim of this study was to investigate the alteration of lumbar spine and trunk postures on different load-carrying types and amounts under static loading. Two load-carrying types(unilateral carrying: UC vs. bilateral carrying: BC) and four different loads(0, 5, 10, and 15 kg) were randomly tested in this study. Carrying a heavy bag would affect human body posture, specifically lumbar spine curvature, which is considered as one of sources of back problems. Previous studies have not paid attention to the approach of the multisegment model of the lumbar spine and trunk. This study separated two compartments of trunk segment(the lumbar and thorax) in the analysis. The multisegment model of the lumbar spine in addition to Helen-Hayes marker set was used. Eight motion analysis cameras and a force plate were utilized. Ten male subjects(mean mass, $70.6{\pm}3.97$ kg; mean height, $178{\pm}4.18$ m) having no musculoskeletal disease participated in this study. We analyzed trunk angles in three anatomical planes and the spinal curvature in sagittal and frontal planes. Increased loading in both UC and BC significantly resulted in increases in trunk forward lean but only UC induced increases in trunk lateral lean. In addition, increased loading in BC produced flatten lumbar curvature in sagittal plane. As far as coupling motion, subjects tended to use axial rotation of the lumbar spine in transverse plane in response to increased UC loading. Finally, it is concluded that the increased static loading in UC rather than in BC tends to causes combined alterations of the spinal postures(sagittal and transverse planes together), which would be vulnerable to improper mechanical stresses on the spine.

      • 배추 자동 수확을 위한 센서 융합 기반 자세제어 : 예비 연구

        박용현 ( Yong-hyun Park ),전종표 ( Jong-pyo Jun ),김혁주 ( Hyuck-joo Kim ),손형일 ( Hyoung Il Son ) 한국농업기계학회 2020 한국농업기계학회 학술발표논문집 Vol.25 No.2

        배추 수확의 기계화율은 매우 낮으며 인력을 통해 대부분의 작업이 진행되고 있으며, 배추 수확 과정의 자동화를 위한 연구가 필요하다. 절단 위치에 따라 결구부 손상으로 이어질 수 있는 문제로 경사를 대응하면서 정확한 절단 과정을 수행할 수 있는 수확기의 연구가 필요하다. 본 연구는 수확기 주행 기체가 아닌 수확기 예취부 자세를 제어하여 정확하게 배추가 수확될 수 있도록 돕는 3축 자세제어 메커니즘을 설계하였고, 칼만 필터를 통해 가속도계와 자이로 센서, 로터리 엔코더를 융합하였다. Roll(ᄒ), Pitch(ჩ ) 각도 데이터로 예취부가 지면과 수평을 유지하도록 제어하고, 지면에 접지되어 주행 되는 예취부 가이드 각(ჩ E)을 높이(೬) 데이터로 캘리브레이션 하는 과정을 걸쳐 예취부의 높이가 일정하게 유지하도록 Slide(೪) 축의 길이를 조절하게 된다. 그리고 노지 경사나 장애물에 대한 급격한 자세 변화에 대응하고 오버슈트를 줄일 수 있도록 PID 제어도 통합하여 알고리즘 안정성을 향상 시켰다. 알고리즘의 가능성을 확인해 보기 위해 배추수확기 예취부 메커니즘을 토대로 한 소형 모델을 제작해 주행 플랫폼(Clearpath Inc. Husky)에 설치하였고, 마이크로컨트롤러를 통해 3축을 제어하는 리니어 액추에이터를 동작하였다. 알고리즘을 통한 소형 모델의 자세제어 동작 유, 무에 따른 예취부 자세 비교실험은 모션 캡처 장비(Opti-Track)로 진행하였고 자세제어가 동작하였을 때 수평, 높이에 대한 RMSE가 각각 0.885, 13.23, 동작하지 않았을 때 RMSE가 2.158, 56.42인 것을 비교하면 예취부의 자세가 수평에 가깝게 제어되고 높이도 일정하게 유지하는 것을 통해 자세제어 알고리즘의 가능성을 확인할 수 있었다.

      • SCOPUSKCI등재

        간장 ( 肝臟 ) , 담도 ( 膽道 ) 및 췌장 ( 膵臟 ) : 담낭 담석환자의 복부피하 지방조직의 지방산 구성

        박용현(Yong Hyun Park),서경석(Kyung Suk Suh),최재운(Jae Woon Choi),송영진(Young Jin Song),이홍규(Hong Kyu Lee) 대한소화기학회 1991 대한소화기학회지 Vol.23 No.3

        The role of dietary fatty acids on the gallstone formation is not yet clear, and several studies have reported conflicting results. The purpose of this study is to access the hypothesis of a relationship between gallstone disease and the type of habitual diet and lipid metabolism by analysing the fatty acids composition of abdominal subcutaneous adipose tissue with Gas Liquid Chromatography. Included in this study was 31 pigment gallbladder stone patients (male 15, female 16) and 38 cholesterol gallbladder stone patients (male 17, female 21). Thirty seven persons (male 18, female 19) without evidence of gallstone disease were used as control group. Each group was further divided by sex. Results are as follows; No significant differences in the composition of the abdominal subcutaneous fatty acids were observed between the pigment stone group and the control group in both sexes. In the cholesterol stone groups, there were no differences in the composition of the subcutaneous fatty acids in the female group. But in the male group, the level of linoleic acid was significantly higher than the control group (p < 0.005). And the level of oleic and palmitoleic acid decreased (p < 0.05). The ratio of palmitoeic/palmitic decreased in cholesterol stone group in both sexes. The level of linoleic acid was higher in all female group than in male group, but was statistieally significant only in the control group (p < 0.05).In conclusion, these results suggest that 1) dietaly fat composition does not contrbute to the formacion of pigment stone, 2) in the male group, although we can not explain the machamism, linolelc acid may play come role on the formation of cholesterol stone and 3) higher level of Hnoleic acid in gemale group gives us some clue to explain female prevalence of gallstone disease.

      • MMORPG의 퀘스트 이해와 플레이어의 다원주의적 이해를 통한 플레이 동기 증강 가능성

        박용현(Park Yong-Hyun),녕서가(Ning shujia),경병표(Kyung Byung-Pyo),이동열(Lee Dong-Lyeor) 한국콘텐츠학회 2009 한국콘텐츠학회 종합학술대회 논문집 Vol.7 No.1

        MMORPG는 퀘스트를 통해 진행되며 그것을 통해 레벨과 밸런스가 구현된다. 또한 퀘스트는 이야기 전달의 역할보다는 아이템과 경험치와 같은 아바타와 관련된 보상을 통한 동기부여 역할이 강하다. 이러한 상황은 결국 MMORPG를 캐릭터 성장을 위해 퀘스트의 보상을 공부해야 하는 어려운 게임으로 만들어 유저 층의 고착화를 초래하고 있다. 이러한 유저 고착화 해소방안으로 퀘스트 플레이의 동기부여 구조를 밝히고 플레이어에 대한 다원주의(多元主義, pluralism)적인 이해를 통해 다양한 유저의 플레이 동기를 증강 시킬 수 있는 퀘스트의 가능성을 살펴보았다. 플레이어의 다원주의적인 이해 방법은 다양한 유저 층의 선호도를 만족시켜줄 퀘스트를 디자인하고 평가할 수 있는 툴로써 가치가 있을 것이다. MMORPG is being progressed through Quest and the level and the balance are realized. Also, Quest plays a strong role of motivation through compensation related with Avatar such as items and experience points rather than a role of story transfer. This situation finally made MMORPG become a difficult game that players should study the compensation of Quest for growth of a character, so it causes fixation of the user class. As a solving method of the fixation of the users, the possibility of Quest capable of strengthening play motive of various users through clarification of motivation structure of the Quest play and pluralistic understanding about players was investigated. The pluralistic understanding method of players will have values as a tool that can design and evaluate Quest satisfying preference of the various user class.

      • KCI등재

        리저널 거버넌스 측면에서 대테러 협력체제의 구축방안

        박용현(Park Yong-Hyun),오태곤(Oh Tae-Kon) 한국법학회 2005 법학연구 Vol.18 No.-

        Nowadays 'governance' has appeared as a significant concept explaining the change of social system or the role of government, It is not merely the concept replacing the traditional way of ruling the state, but the new problem resolution system regarding the whole social behavior of human being. Among diverse patterns of governance, regional governance is especially useful to cope with global issues across political borders. As the globalization is accelerated, current policy making system or problem resolution system at the level of individual state cannot effectively cope with global issues such as terrorism. Therefore, regional governance is required to bring cooperation in global scale, In regional governance, regional community of neighboring states takes an initiative in solving problems. Accordingly, the state should deal with the change and the challenge of international society in relationship with other nations, international governmental organizations, as well as international non governmental organizations. Furthermore, intergovernmental governance needs to be established inside regional governance in order to respond to vertical decentralization in which the authority and responsibility of central government are transferred to local governments. However, to build effective anti-terrorism system in regional governance, comprehensive convention on the suppression of terrorism should be concluded. Moreover, international cooperation system of criminal action needs to be modified by relaxing the principle of bilateralism and the principle of bilateral aggravated punishment. Current terrorism is supported by either passive legal restriction or progressive aid of some states. Hence, international legal sanction on these states should be reinforced as well.

      • 韓中漁業協定에 관한 硏究

        박용현(Park Yong-hyun) 조선대학교 지식경영연구원 2002 지역개발연구 Vol.7 No.2

        In December of 1993. South Korea and China initiated negotiation to make a new fisheries agreement for the West and the South Sea. After 6 years and 8 months of negotiation, both countries finally came into an agreement on August 3rd, 2000. However, the agreement did not come into effect immediately due to the failure of agreement on several critical points such as the fishing quota, the range of fishing zone, etc. In April of 2001, two countries reached a complete agreement, which made it effective from Jun 30th, 2001. This study will put a systematic analysis on the fisheries agreement. The purpose of this study is to suggest a guidance for the better fisheries system and provide a basic data for the negotiation between two countries to establish Exclusive Economic Zone (EEZ), which will eventually contribute to national interests. In order to reach the above goals. this study will review the background and process of fisheries agreement and analyze the contents of the agreement. The method of study is bibliographic research, using all materials on the process of negotiation and the international law of the sea.

      • KCI등재
      • KCI등재

        MMORPG의 퀘스트 이해와 플레이어의 다원주의적 이해를 통한 플레이 동기 증강 방안 모색

        박용현(Yong-Hyun Park),경병표(Byung-Pyo Kyung),이동열(Dong-Lyeor Lee) 한국콘텐츠학회 2009 한국콘텐츠학회논문지 Vol.9 No.10

        MMORPG는 퀘스트는 이야기 전달의 역할보다는 아이템과 경험치와 같은 아바타와 관련된 보상을 통한 게임 플레이 동기부여 역할이 강하다. 이것은 결국 MMORPG를 캐릭터 성장을 위해 퀘스트의 보상을 공부해야 하는 어려운 게임으로 만들어 유저 층의 고착화를 초래하고 있다. 유저 고착화 해소방안으로 퀘스트 플레이의 동기부여 구조를 밝히고 플레이어에 대한 다원주의(多元主義 , pluralism)적인 이해를 통해 다양한 유저의 플레이 동기를 증강 시킬 수 있는 방안을 살펴보았다. 이것은 게임 시스템 내에서 사용자에게 직접질의를 하거나 로그 정보를 활용하는 방법이다. 다원주의적인 이해는 이렇게 수집된 데이터의 활용에 있어서 객관성과 구현 가능성을 보장해 줄 수 있는 가치가 있을 것이다. MMORPG Quest plays a strong role of motivation through compensation related with Avatar such as items and experience points rather than a role of story transfer. This situation finally made MMORPG become a difficult game that players should study the compensation of Quest for growth of a character, so it causes fixation of the user class. As a solving method of the fixation of the users, the possibility of Quest capable of strengthening play motive of various users through clarification of motivation structure of the Quest play and pluralistic understanding about players was investigated. This is a direct response to the user within the game system or how to use the player log information. The pluralistic understanding method of players will have values as a tool that can guarantee the objectivity and actual production of the data collected utilizing.

      • KCI등재

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