Nanogenerators: Fully Rollable Transparent Nanogenerators Based on Graphene Electrodes (Adv. Mater. 19/2010)

Choi, Dukhyun,Choi, Min-Yeol,Choi, Won Mook,Shin, Hyeon-Jin,Park, Hyun-Kyu,Seo, Ju-Seok,Park, Jongbong,Yoon, Seon-Mi,Chae, Seung Jin,Lee, Young Hee,Kim, Sang-Woo,Choi, Jae-Young,Lee, Sang Yoon,Kim, Jo WILEY-VCH Verlag 2010 ADVANCED MATERIALS Vol.22 No.19

<B>Graphic Abstract</B> <P>The cover shows an image of fully rollable transparent nanogenerators synthesized using chemical vapor deposition grown large-scale graphene sheets as transparent electrodes and piezoelectric ZnO nanorod arrays. Sang-Woo Kim, Jae-Young Choi, and co-workers report on p. 2187 the electrical and structural stability of the nanogenerators, with excellent charge scavenging performance under external mechanical loads such as bending and rolling. This study shows that graphene-based nanogenerators are very promising for self-powered rollable transparent device applications. <img src='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content.gif' alt='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content'> </P>

Resistive switching characteristic of Ce0.9Y0.1O2/ TiO2 bi‑layer structure by photochemical metal‑organic deposition

Sung‑Eun Kim,Jin-Gyu Lee,In-Young Choi,Ha-Eun Kim,Hong-Sub Lee 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.1

Sneak current is one of the main bottlenecks for dense crossbar array resistive random access memory. This study reports highly non-linear resistive switching characteristic from Ce0.9Y0.1O2/ TiO2 bi-layer (1S/1R device) structure, fabricated by photochemical metal-organic deposition, as a solution for sneak current issue. Ce0.9Y0.1O2 material, possessing oxygen vacancies, was used as a potential barrier as well as oxygen reservoir which rectified the current of low resistance state without an electrical breakdown in 1S/1R device. TiO2 was adopted for resistive switching property, and TiO2 layer having mixed phase (anatase and brookite) showed typical diode switching behavior. The photochemical reaction of photochemical metal-organic deposition process and phase formation were monitored and established using by Fourier-transform infrared spectroscopy and X-ray diffraction, respectively. The 1S/1R device showed highly non-linear resistive switching characteristic, large on/ off ratio of above three orders of magnitude with low operating current.

주민참여 지도화 기법을 활용한 마을 공간 자원 발굴에 관한 연구

최성진(Choi, Sung Jin) 한국지역사회학회 2018 지역사회연구 Vol.26 No.3

그동안 많은 사례연구가 밝혀왔듯이 마을 자원조사는 도시계획에서 지역 문제에 대한 주민의 참여와 이해를 높이기 위한 중요한 과정이었다. 마을 지도 그리기는 이 과정에서 가장 잘 알려진 기법 중 하나였지만, 지도화 기법 자체와 분석 방법을 개발하는 데는 한계가 있었다. 따라서 거주자의 다양한 관점을 실제계획에 적용하는 것이 중요함을 인식하면서도 대부분 결과적으로는 자원의 발굴, 개발과 사업화가 여전히 전문가에게 맡겨지고, 주민에 의한, 혹은 주민 관점에서의 자원 발굴과 사업화 분야는 주민참여를 촉진하기 위한 프로그램의 한 부분으로 한정되어 있었다. 이에, 본 연구는 지역에 대한 좀 더 나은 이해와 지역공간 자원조사 기법의 개발을 위해 주민참여에 의한 인지 지도의 적용 가능성과 효과를 밝히고자 하였다. 구체적인 연구 방법으로서 대구시 수성구 두산동과 상동을 대상으로 사례연구를 하였으며, 대상지역 주민에게 설문 및 인터뷰를 진행하였다. 그 결과, 첫 번째, 문헌 및 단순 설문조사에 의한 결과와 대조적으로, 거주자의 인지 지도는 다른 지역의 사람들이 발견하기 어려운 다양한 공간 자원과 문제들을 드러냈다. 둘째, 사전 정보를 주지 않은 인지 지도는 주민의 생활에 더욱 밀접한 공간 자원을 나타내었다. 마지막으로 본 연구가 진행되는 과정에서 조사 응답의 양에 따라 공간의 위상을 결정했던 기존의 연구들이 가질 수 있는 잠재적 오류를 밝힐 수 있었다. As many case studies have been addressed, a village resource investigation has been a critical process in urban planning to increase the residents’ participation and their understanding on the regional issues. A village map drawing was the one of the popular techniques for the process, but a limit was exist in developing the mapping and analysis techniques. So, even though the importance of planning application of the residents’ various perspectives, in most cases, the discovery, development and commercialization of resources are still left to experts, and the area of resource discovery and commercialization by residents or from a resident"s perspective is limited to a part of the program to promote community participation. This study aims to reveal an applicability and effectiveness of the cognitive map by residents’ participation for a better understanding of the region and for a development of regional spatial resource investigation techniques. Specifically, this study used a case study of Dusan-Dong and Sang-Dong, Suseong-Gu in Daegu conducting a survey and interview. The first result is that, contrast with the findings by simple documents’ investigation and questionnaire, residents’ cognitive map reveals much more spacial resources and issues that are difficult to be found by people from other regions. Second, a cognitive map without preliminary information indicates more diverse spatial resources which are more connected to residents’ life. Finally, during the course of this study, a previous study on community resource exploration was able to identify possible errors in the results of the study, which determined the status of the space according to the amount of survey responses.

식민시대 지식인, 유상규(劉相奎)의 삶의 궤적

최규진(CHOI Q-Jin),황상익(HWANG Sang-Ik),김수연(KIM Soo-Youn) 大韓醫史學會 2009 醫史學 Vol.18 No.2

Many of the Korean intellectuals resisted against suppression of Japanese Imperialism with the people during the Japanese occupation period. Ryu Sang-Kyu was also one of those intellectuals. Ryu Sang-Kyu was born in Gang-gye of North Pyongan-do on 10th November, 1897. He entered Keijo Medical College as one of the first entering students in 1916. However, at the end of his third year, he participated in the 3·1 Independence Movement of Korea and was suspended from the college which was run by the Japanese on account of his participation. Then moving to Shanghai, he joined Heung Sa Dan(興士團), an active patriotic group fighting for independence of Korea. He initiated the provisional government of Korea as a network investigator and he played second string to Ahn Chang-Ho(安昌浩), one of major Korean independence activists for four years. In 1923, following Ahn Chang-Ho’s advice, he returned to Keijo Medical College to complete the course. Even in colonial Korea, he continued independence movement and was involved in Dong Woo Hoe(同友會), the branch of Heung Sa Dan in Korea. After the graduation of Keijo Medical College in 1927, he had served at the department of surgery in Keijo Medical College. In 1930, he participated in founding of the Korean Medical Association(朝鮮醫師協會). He also raised public awareness by writing to many articles on hygiene and public health issues in public journals and newspapers. In short, he did his best as an intellectual, a medical doctor, an activist of independence movement until he died from streptococcal infection on 7th July, 1936.

상업지역 야간경관조명에 대한 인식 및 개선방안

최열(Choi, Yeol),임하경(Yim, Ha Kyoung),박진성(Park, Jin Sung) 한국부동산학회 2010 不動産學報 Vol.43 No.-

1. CONTENTS (1) RESEARCH OBJECTIVES The aim of this study is to analyze cognition and the function of the lighting at night in Business district, then suggest the improvements in Gwang-ju Metropolitan Area. (2) RESEARCH METHOD This studies surveyed typical business district in Gwang-ju Metropolitan Area : Sang-moo district, Chum-dan district and Gum-ho district. (3) First, the general cognitions of the business streets are not good in Business district respectively. There are not any special quality in sample areas, but Interest of the lighting for the areas is high. Second, the main functions of the lighting at night in Business district is to promote the advertisement effects. At sang-moo and chum-dan district the lighting at night enhance the special quality and the image. Study shows that important factors of the lightning at night is the color of the lighting type, the design of the lightning type and the size of the lighting type. The reflection of the districts's character, the harmony of the streets, and attraction of attention are similar by gender and ages, but make a difference by scholarship. Third, the subjective notions about the bright, strong and clear color of lights is more obvious at downtown business district than a subcenter of a metropolis business district and local district. And the subjective notions about the type and the contents of lights are different. At last, the disorder of the lighting at night like as glitter of the lights and confusion of the types reduce the image, consistency and unity of the business streets. Therefore, to improve the special quality and urban landscapes at night, we propose to make a limitation of the number, color, type of the lights. 2. RESULTS To summarise the study, findings indicated that the notions and interest of the lighting and landscape at night are increase. It show that we need to limit the number, color, type of the lights in Gwang-ju to improve the special quality and urban landscapes at night in business district.

What makes hybrid insourcing successful: A new public–private partnership model for social welfare services

Yang Jae‐jin,Kim Hey Sung,Choi Seong Eun,Ryu Lanhee,Choi Young Jun 한국사회복지학회 2020 Asian Social Work and Policy Review Vol.14 No.1

Outsourcing has been a key policy tool for delivering a range of social services, and regarded as more effective than insourcing or direct government provision. At the same time, it has also caused many delivery issues such as principal‐agent problems, a lack of policy coordination, and poor‐quality welfare services. While the pendulum continues to swing between insourcing and outsourcing, we aim to propose a new public–private partnership model called the “hybrid insourcing model” and examine which factors influence the performance of the model. In South Korea, around 2010, the local government in Namyangju City was the first to implement the “Hope Care Center model,” a kind of hybrid insourcing model, which has been praised for its innovation and widely emulated by central and local governments. Our analysis utilizes data collected between December 2017 and January 2018 from public sector employees and civilian staff in Namyangju and a comparable city, A. From this, we draw a number of implications, both for theory and for policy. We argue that, for public–private partnerships, active cooperation and equality are the biggest factors in contributing to positive performance. These work alongside leaders with a clear vision and with employees' positive attitude

해양공간 정책시뮬레이션 기술 개발 - 현황 및 도전과제

조성진(Sung-Jin Cho),강전영(Jeon-Young Kang),박재영(Jaeyoung Park),최희정(Hee-Jung Choi),남정호(Jungho Nam) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.5

“실제로 존재하지 않는 대상을 존재하는 것처럼 만들어 놓은 인공물"을 뜻하는 라틴어 '시뮬라크르(simulacre)'에서 파생된 시뮬레이션(simulation)은, 복잡한 문제를 해석하기 위해서 실제와 비슷한 상태(시스템)를 모델로서 구현하고, 반복 연산을 통해 최적해를 찾는 과정을 뜻한다(Baudrillard, 1994). 전통적인 분석적 방법론(analytical method)은 계수 추정을 통해서 특정 시점의 두 변수, 즉 독립변수와 종속변수의 상관성을 규명하는데 반해, 시뮬레이션 방법론(simulation method)은 현상의 재현을 통해서 과정을 파악하는데 목적을 둔다. 이러한 특징으로 말미암아 시뮬레이션 기법은 문제의 최적해보다 현상의 규명에 더 적합한 방법론이다. 자연계 (nature system)의 문제(가령, 산사태의 발생원인)는 요인들 간 단순하고 명확한 관계에 의해서 정의되지만, 인간계(human system)의 문제(가령, 부동산 가격상승의 원인)는 비교적 복잡하고 불명확한 관계에 의해서 규정된다. 따라서 주로 인간관계에서 비롯되는 사회 문제를 해결하기 위한 수단으로써 정책은 시뮬레이션 기술을 적용하기에 적합한 대상이다. 일반적으로 정책은 결과 못지않게 과정도 중요하며(당위성), 현재·미래 문제를 포괄하고, 긍정적·부정적 효과(양면성)를 함께 고려하므로, 시뮬레이션은 이러한 요건에 잘 부합하는 기술이다. 최근 노인복지(백의현, 2019), 미세먼지(심창섭, 2019), 주택시장(최명섭&변세일, 2016), 인구센서스(배장현 외, 2016) 등 다양한 정책분야에서 시뮬레이션 기술이 활용되고 있다. 2019년에 재정된 “해양공간계획 및 관리에 관한 법률”에 근거한 해양공간기본·관리계획, 해양용도구역, 해양공간적합성협의 등은 해양자원의 효율적 이용과 해양공간의 갈등 및 상충을 해소하기 위한 해양수산 분야의 新정책수단이다. 최근 해양관광, 골재채취, 해상풍력, 해상경계분쟁 등 사회적 이용 및 갈등이 심화되면서 실효성 있는 해양공간정책의 요구가 높아지고 있는 실정으로, 해양정책을 정확하게 평가하고 지원할 수 있는 과학적 도구가 절실하다. 해양공간은 환경·생태계, 지역사회, 수산업, 관광업, 에너지개발 등 복잡한 이해관계가 얽혀 있으며, 정책평가 시 이러한 관계를 명확하게 정의하고 고려해야 한다. 본 연구는 해양공간정책 지원도구로써 해양정책시뮬레이터(Ocean Policy Simulator, OPSim)를 제안하며, 대표적인 복잡계 연구방법론으로서 거시적 현상을 미시적 행위자의 상호작용으로 설명하기 위해 제안된 행위자기반모형(Agent-Based Model, ABM)을 적용하고자 한다. ABM은 정책 대상 및 환경의 동적 변화와 더불어, 자연·인문 환경과의 상호작용(상충 또는 시너지)이 활발한 해양 분야에 적합한 방법이지만, 동시에 시뮬레이션 결과에 대한 검증의 어려움과 모델 인자의 초기값에 대한 의존성 등 한계점을 내포하고 있다. 따라서 ABM을 적용한 OPSim 개발 과정에서 빅 데이터를 활용한 AI기술, 자가진화 시뮬레이션 기법(self-evolving simulation), 시스템다이나믹스(system dynamics) 등을 활용하여 한계점을 보완할 수 있다(Scheutz et al., 2016; Kang et al., 2016; Bae et al., 2018; Kavak et al., 2018). Simulation derived from the Latin word "simulacre" for "artificial objects that actually do not exist" means the process of modeling a realistic state (system) to interpret complex problems and finding an optimal solution through repeated operations (Baudrillard, 1994). While a traditional analytical method defines the correlation of two variables (i.e., independent variables and dependent variables) through coefficient estimation, a simulation method aims to identify the process through the reproduction of phenomena. Therefore, a simulation technique is a more suitable methodology for identifying phenomena rather than finding an optimal solution. The problem of the natural system (e.g. landslides) is defined by simple and clear relationships between factors, but that of the human system (e.g. real estate prices) is defined by relatively complex and unclear relationships. Therefore, a policy as a means of solving social problems, primarily derived from human relationships, is suitable for applying a simulation technique. Simulation is a technology that meets these requirements well, as a policy addresses the procedure as important as the result, solving current and future problems, and considering both positive and negative effects. Recently, simulation technology has been used in various policy areas such as welfare for senior citizens (Baek, 2019), fine dust (Shim, 2019), housing market (Choi&Byun, 2016), and population census (Bae et al, 2016). Marine space policies based on the Marine Space Planning and Management Act, which was enacted in 2019, such as marine spatial basic and management plans, marine use zones, and marine space suitability consultations are new political tools for efficient use of marine resources and management of conflicts. As social use and conflicts such as maritime tourism, aggregate collection, off-shore wind power, and maritime border disputes have intensified recently, calls for effective marine spatial policies are increasing, and scientific tools are urgently needed to accurately evaluate marine policies. Since marine space is intertwined with complex interests such as the environment, ecosystem, community, fisheries, tourism, and energy development, a marine spatial policy support tool should define and consider these relationships for policy evaluation. This paper proposes Ocean Policy Simulator (OPSim) as a support tool for marine spatial policy. Specifically, we aim to highlight the usefulness of an agent-based model (ABM) to explore human-nature interactions (i.e., conflict or synergy) and to provide policy implications. Using an ABM for such purposes often meet the issues in regard to verification and validation of the model’s structures and outcomes. However, AI technology using spatiotemporal bigdata, self-evolution simulation techniques, and system dynamics can help to tackle validation and verification procedures in the development process of OPSim using ABM (Scheutz et al., 2016; Kang et al., 2016; Bae et al., 2018; Kavak et al., 2018).

단상 유도형 동기 전동기(LSPM)의 특성해석에 관한 연구

정대성,김승주,이진헌,최재학,이주,Jung, Dae-Sung,Kim, Seung-Ju,Lee, Jin-Hun,Choi, Jae-Hak,Lee, Ju 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.3

가전분야에서의 전동기 효율향상을 통한 에너지 소비절감 효과는 상당히 크지만 이를 위한 전동기의 설계/해석 기술 확보가 아직은 미흡한 상태이다. 이에 따라 유도형 동기전동기가 제안되었지만, 유도형 동기 전동기는 유도전동기와 통기전동기의 특성을 동시에 가지고 있어, 해석 및 설계가 쉽지 않다. 따라서 본 논문에서는 기존의 냉장고 압축기용 전동기인 단상유도전동기를 대처할 수 있는 단상 유도형 동기전동기를 이용해 파라미터에 따라 특성이 어떻게 바뀌는가에 대해 서술하였다. 그에 따라 단상유도전동기의 정상상태 특성을 해석하고 제안모델의 성능을 기존모델과 비교하고 실험하여 해석결과의 신뢰성을 검증한다. 또한 본 논문에서는 제안모델의 기존 고정자 형상이나 권선 스팩을 유지하고 회전자의 형상이나 구조만을 변경시켜 성능향상을 도모하였다. 해석방법으로는 전자장 수치 해석적인 방법으로 널리 이용되고 있는 유한요소법(Finite Element Method : FEM)을 이용하였다. Electric motor efficient improvement from home appliance field is important to the effect reducing the energy consumption. But the electric motor design/analysis technology is still insufficient. Specially the electric motor design/analysis technology of satisfying characteristic of both the induction motor and the synchronous motor such as Line start permanent motor. Therefore the electric motor design/analysis technology is urgently demanded reliability. This paper proposes the sing1e-phase line-start permanent magnet motor to develop the motor it with be able to alternate the sing-phase induction motor it is a refrigerator compressor motor. The sing-phase induction motor is analyzed in the steady state. And we have a certification test to compare our single-phase line-start permanent magnet motor with the sing-phase induction motor. In order to improve the performance, the stator of the single-phase line-start permanent magnet motor is same as the stator of the sing-phase induction motor and changes the rotor form and has the permanent magnet. It used the Finite Element Method(FEM) which is widely used with electronic-magnetic field numerical analysis method.

Ehlers - Danlos 증후군

주용진,최성문,최영자,성호석 ( Yoing Jin Joo,Sung Moon Choi,Young Ja Choi,Ho Suk Sung ) 대한피부과학회 1990 대한피부과학회지 Vol.28 No.5

A Case of Ehlers-Danlos syndrome Yoing Jin Joo, M.D., Sung Moon Choi, M.D., Young Ja Choi*, M.D., Ho Suk Sung, M.D. Department of Dermatology, Clooego of Medicine, Inje University, Pusan, Korea We presented a case of Ehlers-Danlos syndrome in a 25-year old female, who had hyperextensibility of skin, skin fragility, cigarette paper-like atrophic scar, joint hyperextensibility and skeletal abnormality of scoliosis since birth. There was no family history. Microscopic and electron microscopic examinations of the skin biopsy specimens from normal appearing skin on the forearm and the site of subcutaneous nodule was compatible with finding of Ehlers-Danlos syndrome. Although the manifestations of this case including marked extensibility of skin, joint, skin fraility and atrophic scar might be in accord with type Ⅰ(gravis) Ehlers-Danlos syndrome, skeletal abnormality of scoliosis did not correspond to this type, but to type Ⅳ(hydroxylysine deficient) Ehlers-Danlos syndrome. We consider this case as a type Ⅳ Ehlers-Danlos syndrome.

향기요법이 통증을 주소증으로 입원한 환자의 수면장애에 미치는 영향

박수곤 ( Soo Gon Park ),양미성 ( Mi Sung Yang ),김오영 ( Oh Young Kim ),조희근 ( Hee Guen Jo ),최진봉 ( Jin Bong Choi ),김선종 ( Sun Jong Kim ),설재욱 ( Jae Uk Sul ) 한방재활의학과학회 2010 한방재활의학과학회지 Vol.20 No.4

Objectives :The purpose of this study is to investigate the effects of aroma therapy on sleep disorder patients with musculoskeletal pain. Methods :The 44 patients were divided into 2 groups: Experimental group(Exp. group) was treated with aroma therapy and control group was treated except aroma therapy. To evaluate the efficiency of aroma therapy, the Korean sleep scale A(Jin-Joo Oh, Mi-Soon Song, Sin-Mi Kim. 1998) and visual analogue scale(VAS) were applied before treatment and after 5 days treatment. Results :1. The Experimental group has improved statistical significance in sleep disorder score as compare to the control group. 2. The improvement of sleep disorder score of Exp.group has difference according to impression. 3. The improvement of sleep disorder has an effect on pain decrease. Conclusions :Aroma therapy has effects of improvement on sleep disorder with musculoskeletal pain.