인간의 집단율동에 의한 고층철골건물의 연직진동평가

황지현,이경구,Hwang. Ji-Hyun,Lee. Kyungkoo 한국방재학회 2013 한국방재학회논문집 Vol.13 No.4

이 논문에서는 인간의 집단율동이 고층철골건물의 연직진동에 미치는 영향에 대하여 해석적으로 평가하였다. 첫째, 고유치해석을 수행하여 대상건물의 모드형상과 진동특성을 살펴보았다. 고유치해석에서 산정된 건물의 연직방향 및 수평방향 고유진동수와 실제 계측값과의 비교과정을 통해 정확한 진동해석을 위한 고려사항을 도출하였다. 둘째, 건물의 12층 바닥에 인간의 집단율동 하중을 작용하는 선형시간이력해석을 수행하여, 진동원과 위치가 상이한 상부층 바닥슬래브의 연직진동 가속도응답을 평가하였다. 실험계측결과와 동일하게 건물 상부층으로 갈수록 바닥슬래브 연직진동이 증폭되는 결과를 도출하였으며, 이는 건물의 연직방향 고유진동수와 인간의 집단율동의 진동수가 일치함에 따라 발생하는 공진현상이 원인임을 확인하였다. In this study, the effects of human group rhythmic activities on vertical vibration of a high-rise steel building were analytically evaluated. A eigenvalue analysis was first conducted in order to investigate the mode shapes and the vibration characteristics of the building. The requirements for an accurate analysis were drawn based on the comparisons of the measured natural frequencies of the building and the estimated natural frequencies of the building. Then, linear time history analyses were conducted by applying human group rhythmic activities to the slab of the 12th floor of the building model. From the analysis results, the vertical vibration acceleration responses in the upper floors amplified by resonance between building and excitations were evaluated.

비정질 실리콘의 부분적 알루미늄 유도 결정화 공정에서의 급속 열처리 적용 가능성

황지현,양수원,김영관,Hwang, Ji-Hyun,Yang, Su-Won,Kim, Young-Kwan 한국결정성장학회 2019 한국결정성장학회지 Vol.29 No.2

박막 태양전지에 주로 적용되는 다결정 규소층을 AIC(Aluminum Induced Crystallization) 공정을 이용하여 제조하였다. 결정립의 확대를 위하여 selective diffusion barrier 사용하였다. 이 diffusion barrier는 $Al_2O_3$ 막을 사용하였다. 공정시간의 단축을 위하여 열처리는 RTA(Rapid Thermal Annealing) 공정으로 진행하였다. 비정질 실리콘의 결정화는 XRD 측정을 통해 분석했다. 그 결과 $500^{\circ}C$에서 결정화되었으며, 결정 크기는 $15.9{\mu}m$로 계산되었다. In this study, polycrystalline silicon thin film useful for the solar cells was fabricated by AIC(Aluminum Induced Crystallization) process. A diffusing barrier for this process is prepared with $Al_2O_3$. For the maximization of the grain size of the polycrystalline silicon, a selective blasting of the $Al_2O_3$ diffusing barrier was conducted before annealing treatment. The heat treatment for the activation of the amorphous-Si (a-Si) layer was carried out with Rapid Thermal Annealing (RTA) process. Crystallization of the a-Si layer was analyzed with XRD. It was confirmed that a-Si was crystallized at $500^{\circ}C$ and the silicon crystal is observed to be formed and the grain size of the polycrystalline silicon was observed to be $15.9{\mu}m$.

우슬로부터 20-Hydroxyecdysone의 분리 및 함량분석

황지현,이승호,박정일,강신정,장승엽,이경순,손건호,Hwang, Ji-Hyun,Lee, Seung-Ho,Park, Jeong-Hill,Kang, Shin-Jung,Chang, Seung-Yeup,Lee, Kyong-Soon,Son, Kun-Ho 한국생약학회 1999 생약학회지 Vol.30 No.3

Separation and quantitative determination of 20-hydroxyecdysone from Achyranthis Radix has been conducted by using HPLC method. 20-hydroxyecdysone in a methanol extract from the raw drug was separated on a reverse phase column using a $CH_3CN-H_2O\;(18:82)$ solvent system and the average content is $0.0931{\pm}0.0048%$. For the preparation of authentic standard, we isolated 20-hydroxyecdysone from the roots of Achyranthes fauriei by $SiO_2$ and RP-18 column chromatography.

통합 프로세스 엔지니어링을 위한 해양 프로세스 기본 설계 방법론

황지현,노명일,차주환,이규열,Hwang, Ji-Hyun,Roh, Myung-Il,Cha, Ju-Hwan,Lee, Kyu-Yeul 대한조선학회 2010 大韓造船學會 論文集 Vol.47 No.2

In this study, an offshore process FEED(Front End Engineering Design) method is systematically established to perform integrated process engineering for topsides systems of LNG FPSO(Floating, Production, Storage, and Off-loading unit) based on the concepts and procedures for the process FEED of general offshore production plants. First, various activities of the general process FEED engineering are summarized, and then the offshore process FEED method, which is suitable for application to all types of offshore oil and gas production plants, is proposed. Second, an integrated process engineering environment is built based on the proposed FEED method. Finally, the integrated process engineering environment is applied to topsides systems of an LNG FPSO in order to verify the validity and applicability of the proposed FEED method. As a result, it is shown that the proposed FEED method can be applied to the process FEED engineering of FPSOs and moreover will be able to contribute to perform successful offshore projects in the future.

온라인스포츠 동호회의 커뮤니티 특성과 커뮤니티 신뢰, 커뮤니티 만족 및 지속적 이용의도의 구조적 관계

황지현(Hwang, Ji-Hyun) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.6

This study has a main purpose that closely examines the structural relationship among community characteristics, community trust, community satisfaction, and continuous usage intention of online sports community club. In order to achieve it, the sample from sports category user of internet portal site were accumulated by using convenience sampling. The samples were 900 people. and we excluded unsuitable sheet like that were decided as untrustful one and an omission and unclear. So the final samples were 314 people. On the basis of that, The statistical techniques, spss 21.0 and amos 21.0 program have been used for the analysis as per research purpose. The statistical analysis used in the research for a data analysis includes frequency analysis, exploratory factor analysis, confirmatory factor analysis, reliability analysis, correlation analysis, and structure equation model analysis. The research has drawn the following conclusions, based on the above mentioned research method and its procedures: First, The community characteristics influences community trust. Second, The community characteristics influences community satisfaction. Third, The community trust influences community satisfaction. Second, The community trust influences continuous usage intention. Third, The community satisfaction influences continuous usage intention.

영재교육종합데이터베이스(GED)의 초등 과학영재교육 프로그램에 포함된 인포그래픽의 특성 분석

황지현 ( Hwang Ji Hyun ),강훈식 ( Kang Hunsik ),유지연 ( You Jiyeon ) 한국초등과학교육학회 2023 초등과학교육 Vol.42 No.2

This study analyzed the characteristics of visualization materials in 78 elementary science-gifted education winner programs of gifted education database focusing on infographics. The visualization materials were classified into general illustrations and infographics. Infographics were also classified into 11 sub-types and 7 sub-roles. The results of the chi-square test revealed that, regardless of the scientific academic field, it was found to contain fewer infographics than general illustrations. Regardless of the scientific academic field, “complex infographics”, “structural infographics”, “processual infographics”, and “comparative analysis infographics” were used frequently. Moreover, relatively many infographics played the role of the “guidance of the inquiry process”, “concept explanation”, and “intensive application”. The most frequent types of infographics were different by the roles of infographics. The frequency distributions for visualization materials by the scientific academic field, types and roles of infographics by the scientific academic field, and types by the role of infographics all had statistically significant differences. Based on these findings, some implications for the direction of using visualization materials in elementary science-gifted educations were discussed.

BEMS 데이터를 활용한 연구소 건물의 전력소비 특성 분석 및 진단에 관한 연구

황지현(Hwang, Ji-Hyun),송두삼(Song, Doo-Sam),이태원(Lee, Tae-Won) 한국건축친환경설비학회 2020 한국건축친환경설비학회 논문집 Vol.14 No.6

Building administrators find it difficult to intuitively identify issues when handling extensive amounts of data, which is the main reason for the failure of building energy management systems (BEMSs) to reach the monitoring level. study proposes methods to quantitatively analyze and diagnose the energy consumption levels during building operation and to derive energy-saving factors to overcome the aforementioned limitation. Seasonal factors, which represent the seasonal energy consumption features, were defined in this study. These factors include the peak load weight (PLW), which represents the quantitative expression of the PLW in five seasonal areas, and the energy consumption proportion, which represents the energy consumption contribution. The daily factors represent the energy consumption load according to the seasons and time periods (maximum load, heavy load, and light load) provided by the Korea Electric Power Corporation. These factors were used to quantitatively analyze the hourly energy consumption levels on representative days based on the five areas. In addition, this study presented the air conditioning performance and return on investment, which represents the profits in comparison with the yearly electric charges of the experimental equipment. As a result of analyzing and diagnosing the power consumption levels by using actual BEMS data and applying energy-saving methods by deriving energy-saving factors as the original function of the BEMS, approximately 17.6% of the total power could be saved.

간호대학생의 사전연명의료의향서에 대한 지식과 태도

황지현(Ji Hyun Hwang),조민영(Min Yeong Cho),강서진(Seojin Kang),이예슬(Ye Seul Lee),김연주(Yeon Ju Kim),송민재(Min Jae Song),황요셉(Yo Seb Hwang),박선아(Sunah Park) 다문화건강학회 2020 다문화건강학회지 Vol.10 No.2

The purpose of this study was to investigate the knowledge and attitudes toward advance directives among nursing students. Methods: A cross-sectional survey was used to gather self-reported data from 146 nursing students attending one university located in Wonju, Gangwon-do. As a measurement tool, knowledge of advance directives and the Korean version of attitudes toward advance directives were used. The collected data were analyzed by t-test, ANOVA, and Person s correlation coefficients. Results: The knowledge of advance directives of nursing college students was different according to grade(F=3.19, p=.026) and the experience of ethics education(t=3.78, p<.001). The attitudes toward advance directives was different according to experience of ethics education(t=2.80, p=.006). There was a positive correlation between the knowledge and attitudes towards advance directives, and it was statistically significant(r=.34, p<.001). Conclusion: A systematic and diverse educational program is needed to improve the knowledge and attitudes towards advance directives among nursing students

필로티형 콘크리트 전단벽 구조물의 능력스펙트럼기반 손상도 기준에 대한 연구

황지현(Hwang, Ji-Hyun),박기태(Park, Ki-Tae),박태원(Park, Tae-Won) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.10

최근 증가한 지진의 발생빈도에 비해 현존하는 건물 중 내진설계가 되지 않았거나 노후화, 구조특성 등으로 적절한 내진성능을 보유하지 않은 건물은 매우 많다. 특히 우리나라 건물 유형 중 하나인 필로티형 콘크리트 전단벽 구조물은 대부분 1층이 연층(soft story) 및 약층(weak story)으로 분류되기 때문에 지진에 의한 횡력에 저항할 수 있 는 전단기능이 크게 결여되어 지진에 매우 취약하다. 본 연구에서는 필로티형 콘크리트 전단벽 구조물의 손상도 기준 에 관한 연구를 수행하였다. 전단벽 시스템의 대표 유형 건물을 선정하여 구조해석을 통해 능력스펙트럼을 산출하였 으며 능력스펙트럼의 형태를 기준으로 손상도 기준을 정의하였다. Despite the increasing incidence of earthquakes in recent years, many of the existing buildings don't have appropriate seismic performance due to the deterioration or structural characteristics. In particular, a piloti-type RC shear wall structure, which is one of the building types in Korea, is highly vulnerable to earthquakes due to a great lack of shear function that can resist lateral force caused by the earthquake since the first floor is mostly soft story, and it is classified as weak story. In this regard, a study on the damage state criterion for the piloti-type RC shear wall structures was carried out. The capacity spectrum was calculated through the structural analysis by selecting typical type of buildings of shear wall systems, and damage state criterion was defined based on the shape of the capacity spectrum.

요코오 타다노리(橫尾忠則)의 조형이미지 변천과정에 관한 연구

황지현 ( Ji Hyun Hwang ) 한국기초조형학회 2005 기초조형학연구 Vol.6 No.4