CIFER^®를 이용한 무인 헬리콥터의 동특성 분석 (I) - 조종기 제어 입력 데이터 획득을 위한 비행시험 -

박희진,구영모,배영환,오민석,양철오,송명현,Park, Hee-Jin,Koo, Young-Mo,Bae, Yeoung-Hwan,Oh, Min-Suk,Yang, Chul-Oh,Song, Myung-Hyun 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.6

Aerial spraying technology using a small unmanned helicopter is an efficient and practical tool to achieve stable agricultural production to improve the working condition. An attitude controller for the agricultural helicopter would be helpful to aerial application operator. In order to construct the flight controller, a state space model of the helicopter should be identified using a dynamic analysis program, such as CIFER$^{(R)}$. To obtain the state space a model of the helicopter, frequency-sweep flight tests were performed and time history data were acquired using a custom-built stick position transmitter. Four elements of stick commands were accessed for the collective pitch (heave), aileron (roll), elevator (pitch), rudder (yaw) maneuvers. The test results showed that rudder stick position signal was highly linear with rudder input channel signal of the receiver; however, collective pitch stick position signal was exponentially manipulated for the convenience of control stick handling. The acquired stick position and flight dynamic data during sweep tests would be analyzed in the followed study.

플라즈마 스프레이 (Ca, Co)-Doped LaCrO₃ 코팅층의 치밀화 및 전기전도도

박희진,백경호,Park, Hee-Jin,Baik, Kyeong-Ho 한국재료학회 2017 한국재료학회지 Vol.27 No.3

Doped-$LaCrO_3$ perovskites, because of their good electrical conductivity and thermal stability in oxidizing and/or reducing environments, are used in high temperature solid oxide fuel cells as a gas-tight and electrically conductive interconnection layer. In this study, perovskite $(La_{0.8}Ca_{0.2})(Cr_{0.9}Co_{0.1})O_3$ (LCCC) coatings manufactured by atmospheric plasma spraying followed by heat treatment at $1200^{\circ}C$ have been investigated in terms of microstructural defects, gas tightness and electrical conductivity. The plasma-sprayed LCCC coating formed an inhomogeneous layered structure after the successive deposition of fully-melted liquid droplets and/or partially-melted droplets. Micro-sized defects including unfilled pores, intersplat pores and micro-cracks in the plasma-sprayed LCCC coating were connected together and allowed substantial amounts gas to pass through the coating. Subsequent heat treatment at $1200^{\circ}C$ formed a homogeneous granule microstructure with a small number of isolated pores, providing a substantial improvement in the gas-tightness of the LCCC coating. The electrical conductivity of the LCCC coating was consequently enhanced due to the complete elimination of inter-splat pores and micro-cracks, and reached 53 S/cm at $900^{\circ}C$.

에너지 효율적 트리로터 수직이착륙 무인항공기 개발

박희진,공동욱,손병락,이동하,Park, Hee-Jin,Kong, Dong-Uck,Son, Byung-Rak,Lee, Dong-Ha 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.suppl3

In the recent research technical solutions have been studied to integrate renewable energy into unmanned aerial vehicles to use it as the main power source. As the weight of the aerial vehicle body is essential for its performance, we consider to use light-weight solar cell technology. Furthermore fuel cells are also integrated create a highly energy-efficient aerial robot. In this paper, construction concept and software design of the tilt-rotor aerial vehicle GAORI is introduced which uses solar cells and fuel cells as power source. The future work direction and prognosis are discussed.

정보채집으로의 접근 - 폭소노미 이해를 위한 개념적 틀 연구 -

박희진,Park, Hee-Jin 한국비블리아학회 2011 한국비블리아학회지 Vol.22 No.3

본 연구는 정보채집(information foraging) 이론을 적용하여 웹 정보자원을 조직, 검색, 공유하는 폭소노미 이용자의 상호작용을 체계적으로 연구, 분석하는 개념적 틀을 제시하고자 한다. 폭소노미 상호작용 이해를 위한 개념적 틀은 최종 이용자의 세 가지 정보행위간의 유기적인 관계로 구성되어 있다: (1) 태그를 활용하여 웹 정보자원을 분류하고 조직하는 태깅; (2) 폭소노미 내에서 유용한 정보 자원을 발견하고 검색하는 정보탐험; (3) 폭소노미를 통해 유사한 관심을 갖고 있는 다른 이용자를 발견하고 커뮤니티를 구성하며, 협업을 통해 새로운 정보자원을 창출해내는 지식공유. 이 틀에서 최종이용자는 정보환경에 유연적으로 적응하며 폭소노미를 통해 줄곧 관심사에 관한 정보를 수집, 모니터하며 다른 이용자와의 효율적인 공유와 검색을 위해 끊임없이 탐험하는 정보채집자(information forager)로 이해된다. 본 연구에서 제시한 개념적 틀은 이용자와 폭소노미의 역동적이고 복잡한 상호작용 현상을 포괄적으로 조망함으로써, 향후 폭소노미를 비롯한 웹 정보서비스의 유용화 연구 설계에 보다 체계적인 이론적 토대를 제공할 수 있을 것이다. This paper proposes a conceptual framework to explore the ways in which people work with in accessing, sharing, and navigating Web resources. In order to provide a better frame of a user's interaction with a folksonomy, an information foraging approach was adapted that denotes adaptive information seeking behaviors of users within human information interaction. A conceptual framework that consists of three different components from users' points of view was proposed: tagging, navigation, and knowledge sharing. This understanding will help us to motivate possible future directions of research in folksonomy and lay the groundwork for empirical research which focuses on qualitative analysis of a folksonomic and users' tagging behaviors.

플라즈마 처리된 폴리이써설폰 막의 CO₂/N₂ 혼합가스의 투과거동에 대한 연구

박희진,노상호,배성렬,문세기,Park, Hee-Jin,Noh, Sang-Ho,Bae, Seong-Youl,Moon, Sei-Ki 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.6

폴리이써설폰 막(polyethersulfone membrane, PES)을 Ar, $NH_3$ 플라즈마로 표면 처리하고, 처리 전후의 변화를 관찰하였다. Ar 플라즈마로 처리하였을 때 O/C의 비율이 증가하며 친수성기의 도입이 확인되었고 $NH_3$ 플라즈마로 처리하였을 때 아민, 아미노기가 도입되었다. 또한 폴리이써설폰 막의 흡습성이 유지될 경우, 플라즈마 처리에 의해 표면에 형성된 극성 작용기들과 $CO_2$와의 내부반응이 증가하였다. 이로 인해 $N_2$에 비하여 $CO_2$의 용해 선택성이 증가하였고 투과도와 선택도가 동시에 향상되는 효과를 나타내었다. 플라즈마 처리된 폴리이써설폰 막에서 $CO_2$의 투과도와 ${\gamma}$(actual separation factor)에 대한 최적조건은 Ar 플라즈마 처리의 경우 10 W-2 min에서 각각 $13.19{\times}10^{-10}cm^3(STP)cm/cm^2{\cdot}s{\cdot}cmHg$와 20.12이며, $NH_3$ 플라즈마 처리의 경우 50 W-2 min에서 $15.40{\times}10^{-10}cm^3(STP)cm/cm^2{\cdot}s{\cdot}cmHg$와 20.06를 얻었다. The surface of polyethersulfone(PES) membrane treated by Ar, $NH_3$ plasma, and the effects were observed before and after the treatment. The membrane treated by Ar plasma was increased the O/C ratio and measured the hydrophilic group, and the one by $NH_3$ plasma was attached the amine group and the amino group. In addition, with the wettability of polyethersulfone membrane $CO_2$ and the polar functional groups of surface interacted increasingly. Thus by comparable increase of the soluble selectivity $CO_2$ to $N_2$ both the permeability and the selectivity of $CO_2$ was improved. The optimum condition for the $CO_2$ permeation and actual separation factor of the plasma treated membrane was as follows; the measurement of Ar-10 W-2 min plasma treatment was $13.19{\times}10^{-10}cm^3(STP)cm/cm^2{\cdot}s{\cdot}cmHg$ and 20.12, and the measurement of $NH_3$-50 W-2 min plasma treatment was $15.40{\times}10^{-10}cm^3(STP)cm/cm^2{\cdot}s{\cdot}cmHg$ and 20.06.

FISH를 이용한 다운증후군과 에드워드증후군의 신속한 산전확인

강진희(Jin Hee Kang),이숙환(Sook Hwan Lee),박상희(Sang Hee Park),박지현(Ji Hyun Park),김지연(Ji Youn Kim),한원보(Won Bo Han),김인현(In Hyun Kim),박상원(Sang Won Park),장진범(Sang Won Park),이경진(Kyoung Jin Lee),박희진(Hee Jin Park) 대한의학유전학회 2007 대한의학유전학회지 Vol.4 No.1

목적 : 다운증후군과 에드워드증후군의 빠른 진단에 있어 FISH 검사의 임상적 유용성과 한계성을 보고하고자 한다. 방법 : 유전질환이 의심되는 고위험임신 309예에서 양수 검사를 통해 미배양 양수세포에서 18번과 21번 염색체의 probes를 이용한 FISH 검사를 시행하고 이들의 결과를 염색체 핵형분석 결과와 비교하였다. 결과 : 평균연령은 34.18세, 평균임신주수는 18주(126.12일)의 309예에서 FISH 검사는 모두 성공하였다. 각각 1예씩의 다운증후군과 에드워드증후군이 FISH로 신속한 진단이 가능했으며 이들은 염색체 핵형 검사에서 확인하였다. 그러나 18번과 21번 이외의 염색체의 이수성과 구조적 이상은 발견하지 못했는데 모두 12예(3.9%)로 상당부분을 차지했다. 앞으로 산전 선별검사에 있어 FISH검사과정의 자동화 기계화로 더 시간을 단축하고 가격을 낮추는 방안이 계속 개발되어야 할 것이다. Purpose : The purpose of this study was to evaluate the clinical utility of rapid detection of Down syndrome and Edward syndrome by Interphase Fluorescence in Situ Hybridization (FISH) analysis Methods : A retrospective study in 309 cases of amniotic fluid samples, analysed by interphase FISH with DNA probes specific to chromosome 18 and 21, was performed. All FISH results were compared with conventional cytogenetic karyotypings. Results : The results were considered as informative and they were obtained within 48 hrs. A case of Down syndrome and a case of Edward syndrome were diagnosed by FISH and confirmed by subsequent cytogenetic analysis. In 12 cases with normal FISH results, the cytogenetic analysis showed a case of partial trisomy 22, three cases of sex chromosomal aneuploidy, two cases of mosaicism, two cases of microdeletion, and four cases of structural rearrangement. Conclusion : FISH is a rapid and effective diagnostic method, which can be used as an adjunctive test to cytogenetic analysis, for prenatal identification of chromosome aneuploidies. For the more genome-wide screening with variety of probes, the technique of FISH is both expensive and labor-intensive.

과업갈등과 팀 창의성의 관계

박희진(Hee Jin Park) 한국기업교육학회 2018 기업교육과인재연구 Vol.20 No.3

본 연구의 목적은 과업갈등과 팀 창의성의 관계, 이들 관계에서 변혁적 리더십과 관계갈등의 조절효과를 검증하는 것이다. 이를 위해 13개 회사의 57개 팀(연구개발 팀 10개, 제품개발 팀 25개, 혁신 팀 22개)의 57명의 팀 리더와 팀원 347명으로부터 자료를 수집하여 상관분석 및 위계적 회귀분석을 하였다. 동일방법편의를 극복하기 위해 팀원들이 설문조사에 답변 하고 8주가 지난 후 팀 리더의 자료를 수집하였다. 분석 결과, 과업갈등은 팀 창의성과 정적관련성이 있었다. 과업갈등과 팀 창의성의 관계에서 변혁적 리더십의 조절효과가 나타났다. 즉, 변혁적 리더십 수준이 높을 때 과업갈등과 팀 창의성은 정적 관련성이 있었다. 또한, 과업갈등과 팀 창의성의 관계에서 관계갈등의 조절효과가 나타났다. 관계갈등이 높은 수준일 때 과업갈등과 팀 창의성은 정적 관련성이 있었지만 관계갈등이 낮은 수준일 때 과업갈등과 팀 창의성은 부적 관련성을 나타냈다. 연구 결과를 근거로, 본 연구의 시사점 및 제한점 그리고 미래 연구에 대한 제안을 논의하였다. In this study, the relationship between task conflict and team creativity and the corresponding moderating effects of transformational leadership and relationship conflict were examined. Data were collected from 57 teams (10 R&D teams, 25 product development teams, and 22 innovation teams). Within the teams, there were 57 leaders and 347 members from 13 organizations. Correlation and hierarchical regression analyses were performed. To avoid common method bias, team leaders were asked to answer a questionnaire eight weeks after team members responded to it. As per the results, task conflict was positively related with team creativity. Transformational leadership moderated the relationship between task conflict and team creativity. Task conflict was significantly positively related to team creativity in case of high transformational leadership. Relationship conflict moderated the relationship between task conflict and team creativity. Task conflict was significantly positively related to team creativity in case of high relationship conflict but negatively related to team creativity in case of low relationship conflict. According to these results, the implications and limitations of the study and suggestions for the future research were discussed.

초등학생의 과학일기 유형 분석 및 일기 쓰기의 효과

박희진 ( Hee Jin Park ),권난주 ( Nan Joo Kwon ) 한국과학교육학회 2008 한국과학교육학회지 Vol.28 No.6

Arabidopsis 의 cab Promoter 의 광조절부위 및 그에 결합하는 단백질 인자의 동정

박희진 ( Hee Jin Park ),김인수 ( In Soo Kim ),이화형 ( Hwa Hyung Lee ),최동국 ( Dong Kug Choi ) 경북대학교 생명공학연구소 1993 遺傳工學硏究所報 Vol.8 No.1

N/A

거대 난관 수종

박희진 ( Hee Jin Park ),김재욱 ( Jae Wook Kim ),윤보성 ( Bo Sung Yoon ),정현주 ( Hyeon Joo Jeong ),김혜령 ( Hae Ryoung Kim ) 대한산부인과학회 2003 Obstetrics & Gynecology Science Vol.46 No.1

Hydrosalpinx is an entity commonly encountered in gynecologic practice. However, giant hydrosalpinx is rare. Although the exact pathophysiology is unknown, most feel that hydrosalpinx is the result of chronic pathological condition of the fallopian tube w