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황진하,서병수 한국반도체디스플레이기술학회 2007 반도체디스플레이기술학회지 Vol.6 No.1
A design of experiments was applied in order to investigate the effect of processing variables in UV irradiation on the electrical/optical properties in indium-zinc oxide thin films, The processing variables, equivalently input variables are listed as UV irradiation time, oxygen flow rate, and chamber pressure. The statistical significance of Ultra Violet (UV) treatment was confirmed using a paired-t test. The full factorial 23 design was employed to determine significant main and interaction effects in UV irradiation process. The chamber pressure and the interaction between UV irradiation time and O2 flow rate were found to be statistically significant at the significance level of 0.1. Furthermore, the optimized approach was proposed in achieving the improved conductivity after UV irradiation.Key words Indium-zinc oxides, UV irradiation, Electrical/Optical Properties, Design of experiments
황진하,김강수,이득행,오재열,최승호,서수연 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.20 No.6
A precast composite column system has been developed in this study by utilizing multi interlocking spiral steel into a centrifugally-formed hollow-core precast (CHPC) column. The proposed hybrid column system can have enhanced performances in the composite interaction behavior between the hollowed precast column and cast-in-place (CIP) core-filled concrete, the lap splice performance of bundled bars, and the confining effect of concrete. In the experimental program, reversed cyclic loading tests were conducted on a conventional reinforced concrete (RC) column fabricated monolithically, two CHPC columns filled with CIP concrete, and two steelreinforced concrete (SRC) columns. It was confirmed that the interlocking spirals was very effective to enhance the structural performance of the CHPC column, and all the hollow-core precast column specimens tested in this study showed good seismic performances comparable to the monolithic control specimen.
Polarization in the Gaming Industry: The dystopian model
황진하,윤영두,Hwang, Jin Ha,Yoon, Young Doo The Korea Institute of Information and Commucation 2016 한국정보통신학회지 Vol.17 No.1
What will the gaming industry look like in the future? Where is it heading? Most producers, developers, and gamers have been pondering such questions since the very beginning of video games. This paper asserts that the current trend in video games to emphasize rationalization will, in time, bring about an extreme polarization within the game industry. Each year the barriers to entry are becoming lower and the size of the game market is growing, which will bring about an emphasis on who has the power to be recognized in the industry. This paper argues that such trends will, in turn, lead to a power play in which the winner will always be the player with the most monetary power. In time, this prolonged power play is expected to bring about what this discussion refers to as a dystopian model within the game industry.
葡萄 Campbell Early 品種의 摘心程度가 花房生長 및 結實에 미치는 影響
黃珍夏,陳英旭 順天大學校 農業科學硏究所 1989 農業科學硏究 Vol.3 No.-
These experiments were carried out to investigate the effect of shoot pinching degrees on growth pattern and berry setting of grape clusters. The growth of clusters was retarded by the shorter of longer shoot pinching on the 6th leaf pinching. The berry diameter and weight were greatest at the 6th leaf pinching plot. The beginning times of the berry drop at the pinching plots were earlier than that at the non-pinching plot, but the peak times of drop became retarded at the pinching plots. The total number of dropped berries at the 6th leaf pinching plot was fewer than at any other plots. The rates of berry setting were 63.2% at the 6th leaf pinching plot, but about 30% at the non-pinching, 2nd leaf, 4th leaf, 8th leaf, 10th leaf pinching plots, respectively.
遮光이 葡萄 Campbell Early 品種의 生育에 미치는 影響
黃珍夏,陳英旭 順天大學校 農業科學硏究所 1992 農業科學硏究 Vol.6 No.-
In order to study the effects of shading on the growth and development in grape Campbell Early, three shading time (two weeks before full bloom, full bloom, two weeks after full bloom) and different shading levels (0%, 15%, 35%, 50%, 70%) were treated ; The shoot growth(shoot length, diameter, and leaf length, width, area) were reduced as the shading time and levels were earlier and more intensity. the cluster growth had a similar trend. The fresh weight, cluster weight of berries, vertical diameter and soluble solid were decreased when shading time and levels were earlier and more intensity, but the acidity was increased. The rate of berry setting at the treatment of two weeks after full bloom or 15percent shading was higher than of that other treatments, with averaged values of 46.7% and 57.3%, respectively. The values above 35 percent shading plots were half of the control. The Chlorophyll content at the treatment of two weeks before full bloom or 35 percent shading was slightly higher than that of other treatments, but the values were not different among treatments. The nitrogen content was increased as earlier time and more intensity of shading, but the amount of K, Ca, Mg and Fe were decreased.
HBIM을 활용한 훼철된 “환구단 석고각” 주요부재별 복원 및 수리 방법
황진하,권기혁,손창일 국가유산방재학회 2024 문화재방재학회 논문집 Vol.9 No.2
본 연구에서는 대한제국 시기 환구단에 건립되어 2차례의 이건 이후 훼철된 대표적인 건축문화유산인 석고각에 대해 해체부재 정밀실측 및 HBIM을 활용한 복원 시뮬레이션을 제시하고자 한다. 연구 과정에서 석고각에 사용되었던 부재의 실측조사를 통해 주요 부재별 손상 상태와 재사용 가능성을 파악하였다. 주요 부재별 조사 내용을 근거로 창건 당시 석고각과창경궁 야외무대로 변용 당시의 모습을 HBIM 모델링 하여 건축구조와 형식, 변화 과정을 분석하였다. 이를 통해 다양한원인으로 훼손, 훼철될 가능성이 있는 건축문화유산의 방재 및 복원대책 수립 시 HBIM 활용에 대한 수리방법론을 제시하고자 한다. In this study, we would like to present a precise measurement of dismantling members and restoration simulation using HBIM for Seokgogak, a representative architectural and cultural heritage built in the Hwangudan Altar during the Korean Empire and destroyed after two relocations. Through measurement of the members used in the Seokgogak during the research process, the damage status and reusability of each major Components were identified. Based on the investigation by major Components, the architectural structure, form, and change process were analyzed by modeling HBIM at the time of transformation into Seokgogak and Changgyeong Palace Outdoor Stage at the time of construction. Through this, a repair methodology for using HBIM when establishing disaster prevention and restoration measures for architectural and cultural heritage that may be damaged or destroyed due to various causes is suggested.
황진하,권기혁,유혜란 국가유산방재학회 2023 문화재방재학회 논문집 Vol.8 No.3
Wooden Cultural Heritage should be preserved and managed in the original form securing the structural stability while it is being repaired or reinforced due to aging for their long existence. Currently, there is a lack of basic data to propose the criteria for when the wooden cultural heritage should be repaired. For the recent preservation of cultural properties, HBIM is used to input the repair history based on the information and repair data of the targeted cultural heritage, and it would be used for the purpose of repair and preservation of the heritage in the future. This study aims to select items to prepare standards for the maintenance of traditional wooden cultural heritage based on the load transmission mechanism of traditional wooden structures along with the safety management guidelines in the Cultural Heritage Protection Act and use them as the basic data for the future cultural heritage conservation management system.
실험적 모드해석을 위한 장치구성 및 LabVIEW 프로그래밍
황진하,박종회,정진덕 충북대학교 건설기술연구소 2004 建設技術論文集 Vol.23 No.1
The purpose of this paper is to construct the vibration test equipments for experimental modal analysis which is more economical than commercial measurement equipments and to develop the analysis program which can be used to extract the dynamic characteristics of structures such as natural frequencies and mode shapes. To verify and validate the suggested hardwares and softwares for economical and accurate vibration test, a cantilever beam test was carried out and the results were compared with the numerical results which was calculated from FE analysis and theoretical values.