Design and Fabrication of a PDMS/Parylene Microvalve for the Treatment of Hydrocephalus

Jonghyun Oh,Gyuman Kim,Kralick, F.,Hongseok Noh IEEE 2011 Journal of microelectromechanical systems Vol.20 No.4

<P>We present a novel microvalve for the treatment of a pathological condition, i.e., hydrocephalus. This microvalve is made of polydimethylsiloxane/Parylene composite layer which has a 3-D dome petal shape. This geometry enables the microvalve to rectify fluid flow in the forward and backward directions. New microfabrication techniques such as dome-shaped SU-8 mold fabrication and excimer laser machining for valve opening have been investigated to build the proposed microvalve. The pressure drop versus flow rate characteristics of the fabricated microvalve was investigated through in vitro flow tests. The flow test results showed that a 10 × 10 microvalve array with a cross-cut opening shape (200 × 60 μm) was found to be optimal for the treatment of hydrocephalus.</P>

공주단층계 북부지역 지하수 내 주원소분포 특성 평가

오종현(Jonghyun Oh),고동찬(Dongchan Koh),조병욱(Byuongwook Cho),염병우(Byuongwoo Yum),김성원(Sungwon Kim),유용재(Yongjae Yu) 대한지질학회 2022 대한지질학회 학술대회 Vol.2022 No.10

Charge Recycle 드라이버 설계

오종현(Jonghyun Oh ),정덕균(Deog-Kyoon Jeong) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6

축구를 통한 독일 통일의 명과 암

오종현 ( Oh Jonghyun ) 호남사학회(구 전남사학회) 2021 역사학연구 Vol.81 No.-

독일의 통일은 ‘서독화’로 압축될 수 있다. 동독의 기존 사회 시스템과 문화에 서독의 가치관과 시스템을 덧입힘으로써 하나의 공동체를 구성해 내고자 한 것이다. 이 과정에서 기존에 동독에 자리 잡고 있던 사회 구성요소가 점차 붕괴하게 되었다. 이러한 변화는 거시적인 분야 뿐만 아니라 개인의 여가나 놀이와 같은 작은 분야에서도 동일하게 나타나는데, 축구계 또한 그 영향력에서 자유로울 수 없었다. 축구는 오늘날 독일에서 가장 인기 있는 스포츠로 독일 내에서 가장 큰 협회와 인프라를 지닌 분야이다. 통일 이후 동독지역 축구계의 변화를 통해통합의 전개와 결과를 가늠해 볼 수 있다. 유럽 축구계는 80년대 중·후반부터 상업화 조짐을 보였으며 90년대에 이르러서는 거대 시장이자 엔터테인먼트 영역으로 변화하게 된다. 미디어의 발달로 인해 자국 내 시청층을 확보했을 뿐만 아니라 전 세계적인 시청층이 확보되면서 축구는 세계 시장을 가진 콘텐츠로 성장하게 되었다. 이에 따라 리그와 컵의 가치가 증대되었으며 축구클럽의 운영 또한 과거와는 다른 ‘경영’의 모습을 띄게 되었다. 일련의 변화 속에서 동독 출신 축구선수에게 통일은 큰 축복으로 다가왔다. 인신구속에서 자유로워졌을 뿐만 아니라 개인의 이적이 가능해졌으며, 더 높은 연봉을 수령 할 수 있게 되었다. 축구선수의 지위가 노동자로 규정되어가는 가운데 이들에 대한 사회적, 경제적 대우는 더욱 좋아졌다. 반대로 동독 클럽에게 통일은 큰 재앙으로 다가왔다. 대다수 동독 기업은 갑작스러운 자본주의 체제로의 변환으로 인해 도산하게 되었다. 클럽 또한 동일하였는데 선수의 이적과 관리에 있어서 미숙함을 보이면서 경제적 위기를 겪게 되었다. 또한 키르히메디아의 파산이라는 독일 축구계 전체의 고난 속에서 동독 클럽은 더욱 큰 위협을 받게 되었다. 여기에 팬층의 경제적 몰락과 구매력 하락은 클럽의 소득을 감소시키는 역할을 하게 되었다. ‘German reunification’ can be condensed into ‘West Germanization’. It was intended to form a community by adding West German values and systems to the existing social system and culture of East Germany. In the process, the social components that had been established in East Germany gradually collapsed. Changes are the same not only in the macroscopic field, but also in small fields such as individual leisure and play. And the world of professional football could not be free from its influence. Today, football is the most popular sport in Germany and has the largest association and infrastructure facilities in Germany. After reunification, it is possible to gauge the progress and results of integration through the changes in the football field in East Germany. The European football industry had signs of commercialization from the mid-and late 80s, and by the 90s, it became a huge market and entertainment area. With the development of media, not only has it secured a domestic viewer but also a global viewer, so football has grown into a content with a global market. As a result, the value of the league and the cup increased, and the operation of the football club also took on a “management” different from the past. Renification came as a great blessing to East German soccer players. Not only was it free from personal confinement, but it was also possible for individuals to transfer and to get higher annual salaries. While the status of football players is becoming more defined as workers, the social and economic treatment of them has improved. On the contrary, reunification came as a disaster for East German football clubs. Most East German companies went bankrupt due to the sudden transition to the capitalist system. Football clubs faced an economic crisis because of its immaturity in the transfer and management of players. Also in the midst of the hardships of the entire German football community, the bankruptcy of Kirchmedia, the east german football clubs were further threatened. In addition, the economic downturn of fans and the decline in purchasing power of fans played a role in reducing the club´s income.

Glitch Free Nand Delay Line Oscillator 설계

오종현(Jonghyun Oh),정덕균(Deog-Kyoon Jeong) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6

16세기 후반 기독교 세계의 고난과 구원의 상상: 루터파 항해 이미지 분석

오종현 ( Jonghyun Oh ) 기독교학문연구회 2022 신앙과 학문 Vol.27 No.1

배와 항해에 대한 메타포는 기독교의 역사에서 자주 사용되었다. 성서에 기록된 내용뿐 아니라 예수의 사역과 제자들의 삶에서 배의 역할은 매우 중요하였다. 중세를 거치는 동안에도 배의 의미는 공동체적인 가치를 강요하는 수단으로 사용되었으며, 이는 건축물과 상징표현들에서도 등장하게 된다. 15세기를 전후로 등장하는 다양한 배에 관한 삽화들은 중세적 표현 전통을 계승함과 동시에 불안한 사회와 가톨릭에 대한 불안감을 내포하고 있다. 종교개혁이 진행되면서 이러한 표현은 더욱 적극적으로 등장하게 되는데, 루터파를 지지하는 작가들이 가톨릭을 비판하는 표현 중 하나로 ‘배/항해’이미지를 사용하였기 때문이다. 그러나 루터파를 둘러싼 정치적 지형과 종교적 상황이 변화하면서 기존의 메타포 사용도 변화하기 시작하였다. 슈말칼덴 동맹의 패배 이후, 종파 내 교리를 둘러싼 갈등은 루터파 지지자들에게 새로운 고민을 제공하였다. 따라서 가톨릭에 대한 비판과 함께 자신들의 교리나 가치를 강조하는 것이 중요하게 나타나게 된다. Metaphors of ships are frequently used in Christianity. In the Bible, ships are represented as major symbols and roles. Even in the Middle Ages, ships were used as a means of emphasizing communal values, which also appeared in buildings and symbolic expressions. In various illustrations appearing around the 15th century, the ship not only inherits the medieval expression tradition, but also contains anxiety about an unstable society and Catholicism. As the Reformation progressed, this expression appeared more actively, because writers who supported the Lutherans used ships as one of the expressions criticizing Catholicism. However, as the political landscape and religious situation surrounding Lutheran changed, the use of the metaphor for ships began to change. After the defeat of the Schmalkalden League, conflicts over doctrine within the sect provided new concerns for Lutheran supporters. Therefore, it is expressed as a more important task to emphasize their doctrine or values.

대학생들의 수업 적응도에 대한 잠재전이분석

오종현(Oh, JongHyun),오보라(Oh, BoRa),김우성(Kim, WooSung) 학습자중심교과교육학회 2017 학습자중심교과교육연구 Vol.17 No.17

The purpose of this study is to investigate the transitions of class adjustment for university students over time. Although there are previous studies related to class adjustment, there are little studies exploring longitudinal changes in class adjustment. This study carried out questionnaire survey on class adjustment to university in March and May 2016 for university students in Gyeongsangbuk-do area. The data of 262 students who answered both the first and second questionnaires were analyzed. As a result of the analysis of the latent profiles, the class adjustment’s profiles were classified into Adjustment_difficulty , Adjustment_medium , and Adjustment_high The results of latent transition analysis on the class adjustment shows that the students had difficulty adjusting to the class over time. In order to determine whether individual characteristics were predictive of class adjustment behavior profiles at Time 1 or transitions in class adjustment from Time 1 to Time 2, gender and high school’s tracks(liberal arts vs science) were incorporated into the Latent Transition Analysis model. The result shows that female students are 3.236 times more likely to be in ‘ Adjustment_difficulty ’ state than male students. The level of academic achievement also differs between latent states on class adjustment. Lastly , the implications and limitations of this stud y were discussed. 본 논문에서는 잠재 전이 분석을 통하여 대학생의 수업 적응도 변화를 탐색한다. 지금까지 학업 적응과 관련된 다양한 연구들이 선행되었으나, 개별 수업에서의 적응의 변화를 종단적으로 탐색한 연구는 미비하였다. 표본은 경북 지역의 대학생을 대상으로 하였으며, 2016년도 3월과 5월, 2회에 걸쳐 수업 적응도 설문 조사를 실시하여 1·2차 설문조사에 모두 응답한 학생 262명의 자료를 수집, 분석하였다. 분석 결과, 대학생들의 수업 적응도는 ‘적응_어려움’, ‘적응_중간’, ‘적응_높음’이라는 3개의 잠재 프로파일로 분류됨을 확인하였으며, 학생들은 학기 초 보다는 학기 말에 수업에 적응하는 것을 더 어려워함을 관찰하였다. 잠재전이모형에 성별과 고교계열을 공변수로 투입하여 분석한 결과, 여학생이 남학생에 비해 수업적응도 1차에서 ‘적응_어려움’ 잠재상태에 속할 확률이 3.235배 더 높았다. 또한. 수업 적응도 2차 잠재상태에 따라, 학업 성취의 정도가 차이가 있음을 확인하였다.

합성 가능한 ADPLL 설계 과정

오종현(Jonghyun Oh),정덕균(Deog-Kyoon Jeong) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6

Biomechanical evaluation of virtual reality-based turning on a self-paced linear treadmill

Oh, Keonyoung,Stanley, Christopher J.,Damiano, Diane L.,Kim, Jonghyun,Yoon, Jungwon,Park, Hyung-Soon Elsevier 2018 GAIT AND POSTURE Vol.65 No.-

<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Patients with brain injuries such as Parkinson’s disease or stroke exhibit abnormal gait characteristics especially during gait transitions such as step initiation and turning. Since such transitions could precipitate falls and resultant injuries, evaluation and rehabilitation of non-steady state gait in those patients are important. Whereas body weight supported treadmill training (BWSTT) provides a safe and controlled environment for gait training, it is unable to adequately train for gait transitions since the typical linear treadmill does not allow for changes in walking direction and natural fluctuations in speed.</P> <P><B>Research question</B></P> <P>This paper verifies if the suggested virtual reality (VR) based walking interface combined with the unidirectional treadmill can stimulate the user to initiate turning gait.</P> <P><B>Methods</B></P> <P>To validate whether initiation of turning was successfully achieved with the proposed walking system, we developed the VR-based walking interface combined with the self-paced treadmill and compared kinematics, kinetics, and muscle activation levels during the VR-based turning and overground (OG) turning as well as between straight walking and turning within conditions.</P> <P><B>Results</B></P> <P>Despite walking on a linear treadmill, subjects showed significant increases in head rotation, pelvic rotation, right hip abduction, left hip adduction, foot progression, medial-lateral ground reaction forces, right medial hamstring activation level, and changes in step width during the VR turn compared to straight walking.</P> <P><B>Significance</B></P> <P>The developed VR-based turning interface can provide a safe and controlled environment for assessment of turning in healthy controls and may have a potential for assessment and training in patients with neurological disorders.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A virtual reality-based walking interface with a linear treadmill was suggested. </LI> <LI> The VR-based walking system was verified to initiate turning mechanism. </LI> <LI> The suggested system evoked turning mechanism including kinetic and kinematic changes. </LI> </UL> </P>

승용차용 고출력 PEMFC 스택 특성 평가

이종현(Jonghyun Lee),손익제(Ikjae Son),윤종진(Jongjin Yoon),김영민(Youngmin Kim),오승찬(Seungchan Oh),고재준(Jaejun Ko) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Maximum PEMFC stack power is one of the important criteria in its application. Most FCV has increased its maximum stack power up to 100㎾ to take some design margins such as service lifetime, vehicle drivability, and fuel cell system efficiency. Hyundai / Kia Motors have already unveiled in-house 80㎾ class stack in 2005. And also new bipolar plate design concepts for higher power beyond 80㎾ were demonstrated in 2007. Within the framework of this study. new stack design concepts have been characterized by various tests such as neutron imaging, cell voltage stability and performances with various operating conditions. The results obtained in new stack are compared with the old one.