http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
위상최적화를 적용한 공작기계 베드의 리브구조 최적설계와 실험적 검증
황지상,김성재,윤정현,성철훈 한국생산제조학회 2023 한국생산제조학회지 Vol.32 No.6
As the eco-friendly automotive industry grows, interest in machinery research for producing environmentally friendly vehicle components increases. Among the components of a manufacturing machine, high stiffness is essential for the bed of the frame. Currently, rib design relies on the experience of mechanical engineers; thus, establishing an optimal method for rib structure design is crucial. This study employed topology optimization to derive the rib structure of the bed. Following this optimization, a compression test was conducted on test specimens from both the initial and optimized designs, produced using a 3D printer. This research confirmed the applicability and validity of using topology optimization in rib structure optimization.
산성염료/Nylon 염색에서 pH와 염료흡착의 실시간 제어(II) -퍼지를 이용한 염색속도 상수와 흡진율 예측-
황지상,조현태,Hwang, Jee-Sang,Cho, Hyeon-Tae 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.1
A fuzzy system which can predict a dyeing rate constant and maximum adsorption in acid dye/nylon system was studied. In this system, pH control profile constant is an input variable and dyeing rate constant is an output variable and the simplified reasoning for fuzzy inference and gradient descent algorithm for optimizing the fuzzy system are used. The result showed that it is possible to predict dyeing rate constants and maximum adsorption with the online control of dyebath pH in acid dye/nylon dyeing system.
산성염료/나일론 염색에서 염액 pH와 염료흡착의 실시간 제어(I) -염액 pH의 제어 profile-
황지상,조현태,Hwang Jee-Sang,Cho Hyeon-Tae 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.1
As a pre-work for real time control of dye adsorption in acid dye/nylon system, a dyebath pH control system was developed by combining chemical dosing and pH measuring equipment, dye bath analysis system, and pH control software. Three types of pH control profiles (Gaussian, exponential, and linear) were proposed for control of dyebath pH and dyeing rate. pH control results were estimated at various conditions-acid and alkali concentration, flow rate of dyeing bath, acid and alkali feed interval. The relation between the pH control profiles and adsorption behaviors of the dye was discussed. From these results, it was concluded that the Gauss type profile was more appropriate than other types for the dyebath pH control in nylon dyeing with acid dyes.
위상 최적화 기법을 이용한 수평형 공작기계의 칼럼 리브구조 최적설계
황지상(Ji-Sang Hwang),김성재(Sung-Jae Kim),성철훈(Chul-Hoon Sung) 한국생산제조학회 2023 한국생산제조학회지 Vol.32 No.1
As carbon neutrality is the advancement in the electric vehicle industry, the demands for battery module cases are increasing. However, current manufacturing machineries are encountering challenges to meet the required demand owing to low precision and long duration for cutting the materials. To meet the demand, it is necessary to study a machine tool that has machining precision and reduced cutting process time. However, current machine tools are not optimized because they are designed according to the subjective decision and experience of the designer. To solve this problem, research is needed to lightweight and increase stiffness by optimally designing ribs of machine tools. In this study, I attempted to increase stiffness and lightweight by applying the topology optimization technique to the column rib of the machine tool. Furthermore, I intend to derive the optimized design parameters by comparing static stiffness of the initial shape and optimized shape after optimization.
단절지역 연계가 필요한 입체개발구역 유형화 연구 - 서울시 통과교통과 그 주변지역을 중심으로
황지상(Hwang, Ji-Sang),정광진(Jung, Kwang-Jin),유석연(Yoo, Suk-Yeon) 한국도시설계학회 2020 도시설계 : 한국도시설계학회지 Vol.21 No.6
본 연구는 서울의 통과교통인 도로ㆍ철도에 의해 단절된 지역을 연계하기 위해 지정하는 입체개발구역의 유형화를 목적으로 한다. 도로나 철도같이 지역을 단절시키는 통과교통을 입체개발의 대상으로 설정하고, 분석의 범위를 단절된 주변지역까지 확장하여 입체개발구역을 유형화 하였다. 선행연구와 관련문헌 분석을 통해 ‘중심지’, ‘하천ㆍ공원’, ‘역세권ㆍ환승거점’, ‘용도지역’으로 유형화하였고 도출된 유형별 대상지를 중첩하여 입체개발의 우선순위를 도출하였다. 최종적으로 네 가지 유형이 모두 중첩되어 우선순위가 높은 대상지는 ‘광운대역’, ‘디지털미디어시티역’, ‘신길역’, ‘신도림역’으로 나타났다. 본 연구의 결과는 향후 입체개발사업의 실행을 위한 우선순위 설정의 기초자료로 활용될 수 있으며 통행수요와 단절을 판단할 수 있는 세부지표 연구가 필요하다. This study categorizes the multi-level development zones designated to connect districts isolated by through traffic in Seoul. Through traffic, such as roads and railways, which isolates districts, was specified as a target for multi-level development. Moreover, the analysis range was extended to the isolated neighboring districts to categorize the multi-level development zones. Based on previous studies and related literatures analysis, the zones were categorized into four types: ‘city center’, ‘river/park’, ‘station area/transit point’ and ‘land-use’. The priority of multi-level development was accorded to target districts that were satisfied with all four types. Ultimately, seleted high-priority target districts were ‘Kwangwoon University Station’, ‘Digital Media City Station’, ‘Singil Station’ and ‘Sindorim Station’. This study’s results may be used as preliminary data for setting priorities for the implementation of future multi-level development projects. Additionally, studies on detailed indices are necessary to measure the characteristics of traffic demand and disconnection more precisely.