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.

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 $900^{\circ}C$.

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.

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.

노인시설의 단위주거에 대한 요구 분석

박희진(Park, Hee-Jin),양세화(Yang, Se-Hwa),오찬옥(Oh, Chan-Ohk) 한국실내디자인학회 2003 한국실내디자인학회논문집 Vol.- No.36

모바일 환경을 위한 소셜네트워킹서비스 요소와 특성에 관한 연구 : 공동체를 중심으로

박희진(Hee Jin Park),손지선(Ji Seon Son),정지홍(Ji Hong Jung) 한국HCI학회 2005 한국HCI학회 학술대회 Vol.2005 No.1

기업의 사회적 가치와 회계투명성

박희진(Hee-Jin Park),이용석(Yong-Seok Lee) 한국국제회계학회 2020 국제회계연구 Vol.0 No.90

본 연구는 국내 기업의 사회적 책임활동 증가와 스튜어드십코드 도입확대에 따라 기업의 사회적 가치의 중요성이 재조명되는 현 시점에서 기업의 사회적 가치와 회계투명성을 종합적으로 실증분석 하였다. 기업의 사회적 가치는 경제정의연구소에서 발표되는 KEJI 지수를 근거로 한 기업의 사회적 책임활동(CSR)으로 측정하였으며, 회계투명성은 이익에 대한 자본시장의 반응으로 측정되는 이익투명성(Barth et al. 2013)으로 측정하였다. CSR활동이 기업의 이익투명성과 어떠한 관련성이 있는지, 지속적인 CSR활동은 이익투명성에 긍정적인 영향을 미치는지를 검증하였다. CSR활동을 수행하는 기업일수록 이익투명성이 증가하는 것으로 나타났고, 이는 연속적(지속적)으로 CSR활동을 수행하는 기업에서도 일관된 모습을 보였다. 즉, 자본시장 참여자들은 CSR활동을 수행하는 기업의 이익정보에 더 높은 관심을 가지는 것으로 나타났다. 뿐만 아니라 CSR활동으로 인해 발생하는 추가적인 비용부담으로 CSR활동이 기업가치에 부정적인 영향을 미칠 수 있다는 우려와는 달리 CSR활동을 수행함으로써 보다 유용한 정보를 제공함을 시사한다. 또한 CSR활동에 따른 비용보다 CSR활동으로 인한 이익투명성의 증가가 더 우세하다는 결과를 보였다. 이는 CSR활동을 단순히 비용측면에서 접근할 것이 아니라 CSR활동이 기업의 매출 증가에 영향을 주어 기업의 가치가 증가할 수 있음을 입증한 결과라 할 수 있다. 또한 소비자가 제품의 가격, 경쟁력뿐만 아니라 올바른 기업에 대한 가치를 소비한다는 사실을 시사한다. 사회적 가치에 있어 선도적인 역할을 수행하는 기업이 시장 경쟁력을 키울 수 있다는 점에서 기업의 경영진에게 유용한 정보를 제공할 것으로 보인다. This study comprehensively empirically analyzed corporate social values and accounting transparency at the present time when the importance of corporate social values is re-examined in accordance with the increase in social responsibility activities of Korean companies and the introduction of stewardship codes. To estimate corporate social value, it was measured by corporate social responsibility (CSR) based on the KEJI index, published by the Institute for Economic Justice, and profit transparency measured by the response of the capital market to profits (Barth et al. 2013) To measure accounting transparency. We verified whether CSR activities are related to corporate profit transparency and whether continuous CSR activities have a positive effect on profit transparency. It was found that the transparency of profits increased for companies performing CSR activities, and this was also consistent among companies performing CSR activities continuously (continuously). In other words, it was found that capital market participants have a higher interest in profit information that performs CSR activities. In addition, it suggests that CSR activities provide more useful information, as opposed to concerns that CSR activities may negatively affect corporate value due to the additional cost burden of CSR activities. This suggests that the increase in profit transparency due to CSR activities outweighs the costs of CSR activities. This is a result of proving that CSR activities can increase the value of a company by not only approaching it in terms of cost, but also that CSR activities affect the company’s sales growth. It also suggests that consumers consume the value of the right company as well as the price and competitiveness of the product. It is also expected to provide useful information to the executives of the company in that a company that plays a leading role in social value can increase market competitiveness.

충남지역 일부 교육시설의 HCHO 및 VOCs 농도 분포에 따른 실내 공기질 평가

박희진(Hee-Jin Park),김효정(Hyo-Jung Kim),우경숙(Kyung-Sook Woo),강택신(Tack-Shin Kang),이종대(Jong-Dae Lee),손부순(Bu-Soon Son) 한국환경교육학회 2013 環境 敎育 Vol.26 No.4

In this study, HCHO and VOCs of 51 schools and 11 child care centers in Chungnam Area were surveyed from March 2011 to January 2012. The concentration of HCHO in the child care centers and the schools were 21.53 ㎍/㎥ and 42.80 ㎍/㎥ respectively. Also, the concentration of VOCs in the child care centers and the schools were 158.90 ㎍/㎥, 192.53 ㎍/㎥ respectively. While the concentration of both substances did not exceed the standards in the child care centers, VOCs (4.98%) was slightly higher than HCHO (8.06%) in the schools. The regional differences in the surveyed area were as follows; the HCHO level of child care center located in urban and rural area were 25.52 ㎍/㎥ and 35.26 ㎍/㎥ respectively. The VOCs concentration in urban and rural area 144.99 ㎍/㎥ and 155.92 ㎍/㎥ respectively. In schools, the concentration of HCHO were 35.73 ㎍/㎥ in rural area level 57.65 ㎍/㎥ in urban area. VOCs level was 243.07 ㎍/㎥ in urban area, which was higly measured than 168.46 of rural area. As the results of the correlation analysis between school environment was highly correlated to the HCHO and the number of students per class (p<0.05).