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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.
평활관 및 열전달촉진관에서 액체질소의 관내 증발열전달 특성에 대한 연구
황지상(Jee-Sang Hwang),정진택(Jin Taek Chung),윤린(Rin Yun),김용찬(Yongchan Kim),문영준(Young June Moon),김동혁(Dong-Hyuk Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
An experiment was performed to study the evaporation heat transfer and the pressure drop characteristics of liquid nitrogen in a horizontal stainless steel tube with wire coil inserts. The inner diameter of test tube is 4.3mm and the length is 1.5m. Four wire coils having different pitch and thickness were inserted into the plain test tube. The wire coil length is 1.5m and the diameter is 3.65mm with thickness of 0.5mm and 0.9mm. Experiments were conducted at saturation temperature of -191℃ mass flux from 200 to 370 kg/㎡s and heat flux of 62 kW/㎡. Direct heating method was used to apply heat to the test section. Boiling heat transfer coefficients of both the plain and the enhanced tubes were calculated. Pressure drops between inlet and outlet side of test section were also measured, and they are used to estimate EPR(Enhancement Performance Ratio).
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.