FBG 광섬유센서가 내장된 7연 강연선을 이용한 포스트텐션 UHPC 교량의 긴장력 장기모니터링

김현우,김재민,최송이,박성용,이환우,Kim, Hyun-Woo,Kim, Jae-Min,Choi, Song-Yi,Park, Sung-Yong,Lee, Hwan-Woo 한국전산구조공학회 2015 한국전산구조공학회논문집 Vol.28 No.6

이 연구에서는 FBG센서가 내장된 강연선을 포스트텐션 UHPC 교량(길이 11.0m, 폭 5.0m, 높이 0.6m)에 적용하고 약 1년간의 긴장력 장기모니터링 결과를 정리하였다. 그리고 초기 도입 긴장력과 차량재하시험을 통하여 콘크리트 내부 강연선의 긴장력 변화를 계측하고 계측결과에 대한 분석을 수행하였다. 연구결과, 이 연구에서 제안하는 콘크리트 내부 긴장력 측정방법이 공영 중인 교량에서 외력으로 인한 콘크리트 내부의 작은 프리스트레스 변화를 효과적으로 측정할 수 있음을 알 수 있었다. 아울러 장기 계측결과를 이용하여 응력변화에 의한 유효변형률을 정확하게 얻기 위해서는 온도보정에 사용되는 열팽창계수의 선택이 매우 중요함을 알 수 있었다. This paper presents results of one-year monitoring on prestressing force of a 7-wire steel post-tensioning strand which is installed in a UHPC(ultra high performance concrete) bridge with 11.0 m long, 5.0 m wide, and 0.6 m high by using a FBG-encapsulated 7-wire steel strand. The initial prestressing forces and the prestress changes during a vehicle load test were measured using the FBG-encapsulated strand. The results show that the FBG-encapsulated 7-wire strand is very effective for monitoring the prestress forces even the change in the tension force is very small. Additionally, it was indicated that selection of the thermal expansion coefficient which is used for the temperature correction shall be carefully carried out.

유기질비료의 표층 및 전층시비에 따른 벼 수량 변화

김현우,최현석,김병호,김홍재,최경주,정덕영,이연,박광래,정석규,Kim, Hyun-Woo,Choi, Hyun-Sug,Kim, Byeong-Ho,Kim, Hong-Jae,Choi, Kyeong-Ju,Chung, Doug-Young,Lee, Youn,Park, Kwang-Lai,Jung, Seok-Kyu 한국유기농업학회 2012 韓國有機農業學會誌 Vol.20 No.1

벼 유기재배를 하는데 있어서 전층과 표층 시비방법에 따른 토양의 화학성, 물리성, 미생물상, 그리고 벼의 생육과 수량에 대해서 어떠한 영향을 미치는 지를 구명하기 위해서 수행하였다. 2008년부터 2010년까지 3년간에 걸쳐서 전라남도농업기술원 시험포장(논, 양토)에서 조사하였고 시험품종은 '동진1호'를 이용하였다. 토양유기물은 표층시비에서 높았고 토양양이온은 전층시비에서 높았다. 유기질비료의 질소 무기화율은 표층시비에서 높았고 잔존하는 시기별 토양 유기물함량도 표층시비에서 높은 경향을 나타내었다. 토양물리성은 전층시비에 의해서 향상되는 경향을 보였고, 토양 미생물상은 전체적으로 표층시비에서 높았다. 표층시비구가 전층시비보다 5%의 수량이 증수되는 특성을 보였다. This study was investigated to evaluate the effects of fertilizer application of surface and broadcast for rice culture on the soil chemical, physical, and microbial properties as well as growth and yield of rice. The application was made with 'Dongjin 1' rice at Jeollanam-do Agricultural Research & Extension Services from 2008 to 2010. Soil organic matter and cation concentrations were increased by surface and broadcast applications, respectively. Plots treated by surface application tended to be higher seasonal N-mineralization rate in the organic fertilizer and seasonal soil organic matter than those of broadcast application. Soil physical properties seemed to be improved by the broadcast application, and soil microbial properties were increased by the surface application. Surface application increased 5% of rice yield compared to that of broadcast.

치과 임프란트에 대한 일반인의 인식도에 관한 설문조사 연구

김현우,박상수,김우택,조남성,박양호,박준우,이건주,Kim, Hyun-Woo,Park, Sang-Soo,Kim, Woo-Taek,Cho, Nam-Sung,Park, Yang-Ho,Park, Jun-Woo,Rhee, Gun-Joo 대한구강악안면외과학회 2001 대한구강악안면외과학회지 Vol.27 No.4

The techniques of the dental treatment are well known to common people, but the dental implant as one of the treatment options to rehabilitate patient's mouth is little known to them. Taking these situation into consideration, we, writers made actual analyses of statistics by putting into the form of diagrams based on questionnaires. Three hundreds of common people over 20 years old were picked up and we used convenience sampling method which is one of nonprobability sampling methods. Statistics are about these questions. 1. How much common people know about dental implant as a treatment option. 2. How much common people know about the detailed portions of the dental implant for rehabilitaton. 3. How common people got to know the dental implant. We present actual answers of the common people.

신체형 동통장애 환자의 정신치료 경험

김현우,이현제,Kim, Hyun-Woo,Lee, Hyun-Je 한국정신신체의학회 1994 정신신체의학 Vol.2 No.1

The authors tried to look into the process of the individual psychotherapeutic experience of a 18-year-old male diagnosed as somatoform pain disorder or chronic pain syndrome. The patient had showed strong resistance to acceptance of his psychological problems. Some issues such as indications of psychotherapy for chronic pain, changing the mode of the treatment some problems around changing the therapist secondary gain and parents' attitude were discussed considering their relatedness to the outcome. The psychotherapy had lasted about 2 years and the result was estimated as fair.

Fabrication and annealing effects of SnO2/SiOx nanocables sheathed by the sputtering technique

김현우,Seung Hyun Shim,Jong Woo Lee,Hyo Sung Kim,Mesfin Abayneh Kebede,나한길,양주찬,공명호,이종무 한국물리학회 2010 Current Applied Physics Vol.10 No.1

We reported an approach, in which we have produced the nano-sized crystalline tin oxide (SnO2) particles with rutile structure. SnO2 nanowires were coated with a shell layer of SiOx via a sputtering method. Transmission electron microscopy and elemental mapping investigations revealed that the nanostructures consisted of a crystalline SnO2 core surrounded by an amorphous SiOx sheath. The annealing effects on the core-shell nanowires were investigated, revealing that the outer surface became rougher by the thermal annealing. For core-shell nanowires, a room-temperature PL measurement with a Gaussian fitting showed yellow, blue, and violet light emission bands, with the relative intensity of the yellow band showing an increase after thermal annealing. Possible PL emission mechanisms are discussed. This study reveals that the sputtering is effective for preparing the shell layers of nanocables.

Synthesis, Structural Characterization, and Photoluminescence Properties of SiOx Nanowires Prepared Using a Palladium Catalyst

김현우,이종무,윤의준,염근영,황해진,Hyeong Joon Kim,Hyung-Sun Kim,유지범,Jong Woo Lee,이내응,Seung Hyun Shim,Sun Keun Hwang,Sung-Yoon Chung,주영창 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.6

We report the production of SiO$_x$ nanowires by thermal heating of Pd-coated Si substrates. Scanning electron microscope images indicated that the nanowires had diameters in the range of 15 -- 100 nm. X-ray diffraction, selected area electron diffraction, and energy dispersive X-ray analyses revealed that the nanowires were amorphous and comprised of silicon oxide only. Photoluminescence measurements showed that the SiO$_x$ nanowires had an emission band in the blue region. We discuss a possible growth mechanism for the SiO$_x$ nanowires.

구독 서비스의 사용자 경험 만족도 요인에 관한 연구

김현우,김승인,Kim, Hyun-Woo,Kim, Seung-In 한국디지털정책학회 2020 디지털융복합연구 Vol.18 No.9

본 연구는 구독 서비스 중 '무제한형 구독 서비스'의 사용자 경험 만족도 요인을 측정하고, 경제적 문화적 관점을 토대로 분석하는 데 목적이 있다. 해당 서비스를 사용해본 경험이 있는 20-30대를 모집하였고, 피터 모빌(Peter Morville)의 허니콤 모형을 재구성하여 작성한 질문을 통해 설문조사를 시행하였다. 설문 결과, 경제적 관점에서는 서비스 가격과 이용 시간에 대한 가성비 및 구독 유입의 용이성이 만족도 주요 요인이었으며, 문화적 관점에서는 서비스에 대한 친근감과 믿음 및 주변 사람들과의 콘텐츠 공유 경험이 주요 만족 요인이었다. 따라서 구독 서비스의 사용자 경험 만족도는 일차적으로 경제적 만족도가 먼저 충족되어야 문화적 만족도 충족으로도 이어진다는 것을 추론할 수 있다. 본 연구는 무제한형 구독 서비스의 사용자 경험이나 만족도 요인에 관한 연구의 자료로써 활용되기를 기대한다. The purpose of this study is to measure the satisfaction factors of user experience of 'Unlimited subscription service' among subscription services and analyze them based on economic and cultural perspectives. By recruiting the '20-'30s who had experienced using service, they attended a survey which was based on the reconstructed honeycomb model of Peter Morville. As a result of the survey, in terms of economic perspective, cost of service, and the ease of subscription inflow were the main satisfaction factors. From a cultural perspective, the familiarity with service and belief and experience of sharing content with people around them were the main satisfaction factors. Therefore, it can be inferred that the satisfaction of the user experience of the subscription service should be firstly satisfied with economic satisfaction, which leads to cultural satisfaction. This study is expected to be used as research data on user experience and satisfaction factors of unlimited subscription service.

건설엔지니어링 기업경기실사지수 개발에 관한 연구

김현우,진경호,이교선,김미리,Kim, Hyun-Woo,Chin, Kyung-Ho,Lee, Kyo-Sun,Kim, Mi-Ri 한국건설관리학회 2012 한국건설관리학회 논문집 Vol.13 No.6

최근 가파른 성장세를 기록하고 있는 고부가가치 산업인 건설엔지니어링 산업을 미래지향적인 산업으로 바라보는 시각이 많아졌다. 하지만 타 산업분야에 비해 경기 동향을 분석할 수 있는 체계가 미흡한 실정이다. 따라서 본 연구에서는 건설엔지니어링 기업을 대상으로 하는 기업경기실사지수 모델을 개발하여 2011년 4/4분기와 2012년 1/4분기에 대한 경기 동향을 조사하고 주요 특징을 분석하였다. 건설엔지니어링기업 경기실사지수(CEBSI)는 자금부문, 인력부문, 채산성, 수주규모, 국내외 시장현황, 경영 애로사항, 정책개선 등 기업 경기상황을 정확히 판단하기 위한 지표로 구성되었다. CEBSI는 향후 건설엔지니어링 산업뿐만 아니라 전체 건설 산업의 경기현황 및 전망자료로 활용되어 체계적이고 정확한 정책을 수립할 수 기초 자료로 활용될 것이다. Currently, construction engineering industry of high value and rapid growing has been viewed as a future oriented industry. Thus, compared to other industries, its analysis system for business trend seems insufficient. This research has developed a business survey index model targeted for construction engineering industries, and business trends for 4/4 quarter of 2011 as well as 1/4 quarter of 2012 were surveyed as important traits were analyzed. Business Survey Index of Construction Engineering has been constructed in form of an index in order to accurately judge different economic states of the industry such as funding areas, human resources, payability, ordering scale, status of domestic and foreign markets, Difficulties in Management, and improvements in policies. In the future, CEBSI will not only be applied on the construction engineering industry, but it will also be used as the economic state of all construction industries as well as the prospect data. Thus, it will be utilized as basic resources that can establish systematic and accurate policies.

폐경기 증후군의 사회심리적 측면

김현우,Kim, Hyun-Woo 한국정신신체의학회 1996 정신신체의학 Vol.4 No.1

Regarding menopause as a turning point in woman's lift, the author reviewed the psychosocial aspects of menopause. Seeing menstruation as the symbolic meaning of female sexuality, psychoanalysts argue that menopause, the loss of symbolic meaning of female sexuality, may bring a mourning reaction to woman. It is reported that the high ratio of depression does not have a serious relationship with the menopause syndrome, and that depression cannot be viewed as a different symptoms. It is also proved that most women successfully recover themselves from temporary menopause symptom. Research data shows that some women have a negative thought on the meaning of menopause. Others, however, have a positive concept on the meaning of menopause because of the feeling of release and freedom. In sum, the author suggests that psychosocial consideration is very important as much as bilogical consideration in considering the meaning of menopausal syndrome.

소규모 기독교 대학의 서비스러닝 질적사례 연구: 서비스러닝 효과와 학습정서를 중심으로

김현우,이정미,Kim, Hyun Woo,Lee, Jeong Mee 한국기독교교육학회 2022 기독교교육논총 Vol.- No.71

This study tried to explore the ways to operate service learning more effectively by analyzing the educational effects of service learning and changes in learning sentiments that appeared in the service learning operation process established for the realization of the Christian educational philosophy at a small local Christian university. The analysis was conducted using NVivo11, focusing on the reflection journals of students who participated in service learning in the first semester of 2022 at J University. As a result of the study, through service learning, personal competence growth, self-reflection and will to change, self-esteem and self-efficacy, social and civic aspects, social responsibility enhancement, community (community) empathy and awareness of participation, and helping others There were educational effects such as an increase in the breadth of understanding. In addition, learning emotions that appeared in the service learning process included positive emotions such as gratitude, challenge recognition, pride, confidence, and responsibility, and negative emotions such as worry (difficulty), upset, regret, and awkwardness. It is a measure to increase the educational effect based on the learning emotion shown in the service learning process. When operating service learning, the service period at the visiting institution is increased to 6 weeks or more, and based on close interaction and detailed analysis of the educational environment in the planning stage, Suggest to develop and operate a plan. In addition, if you have the opportunity to receive feedback from your professors and colleagues through demonstrations and mock presentations in the classroom before visiting the institution, and finally have the opportunity to visit the institution again after the results of service learning are announced, more quality service learning education will be operated. Based on the results of this study, it is expected that more valuable and meaningful service learning education opportunities will be provided to learners by designing and operating a practical and sophisticated service learning curriculum.