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曹?勇 대한교통학회 1995 대한교통학회 기타자료 Vol.1995 No.-
On the basis of deeply analysing the historical course of formation and national conditions as well as economic environment of the China various kinds and different characteristics cities in several large districts, this .thesis studies the present situation of China cities’ outside transportation ways and their existing problems which are given a quantitative comparing analysis. For the purpose of promoting the economic development of these cities, this thesis proposes some opinions on perfecting direction and improving strength of the China cities outside transportation ways.
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조요셉,김 용 성,이남규 한국공간디자인학회 2023 한국공간디자인학회논문집 Vol.18 No.3
(Background and Purpose) This study investigated the program changes in the Culture and Arts Center from the five-year plan for local culture and entertainment in Korea since 1974 to confirm its development into a complex cultural space that serves local residents. Initially, the center had a performance-oriented program, but now it provides various programs such as exhibitions, education, and information in a complex manner, with sports programs recently added. This study aimed to identify and analyze these complex trends and their current status. (Method) A theoretical review of the prior research was conducted to examine and verify the program complexation of the Culture and Arts Center. Subsequently, data were collected from 1970 to 2023 to analyze how the complexity of the program evolved over time. The research methodology involved establishing the concept of program complexation, reviewing the hypotheses based on previous studies, and conducting a cross-analysis of the program's presence and absence values over a time series. Data processing was conducted using Microsoft Excel, and cross-analysis was performed using SPSS. (Results) This study examined the relationship between program characteristics and values at the Culture and Arts Centers over time. The results showed that exhibitions, sports, and events/assembly programs exhibited a correlation between program complexity and changes over time, whereas education and information programs did not. The center shifted from a performance focus to a broader range of programs. Educational and information programs were not considered complex because of a lack of correlation. (Conclusions) Cultural arts centers provide various spaces with different functions, and research on spatial design has shifted to program-centered diversification and segmentation. Exhibitions, sports, events, and rallies have been affected by this diversification, but educational and information programs remain unchanged. Nonetheless, education has the highest proportion of all programs, making it significant in terms of diversity. The 2000s saw the highest proportion of diversification, with education, exhibitions, events, and rallies occurring the most frequently. Exhibitions, education, and events had the highest frequency, whereas sports complexes had the lowest. Information complex programs had the lowest frequency and proportion, including libraries, reading rooms, book cafés, data rooms, and information rooms. Although these programs were not affected by the changing times, they are expected to be affected by future diversification programs. Early cultural arts centers focused on performance-centered programmes; however, various programmes have emerged from this focus, reflecting the changing needs and interests of cultural arts center audiences. Diversification has led to greater program variety, which enhances a center's cultural and artistic impacts.
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A Prediction of the Transient Phenomena by the Load Rejection for a 50MW Francis Hydropower Plant
조태영,고성호,조 용,배강호 한국유체기계학회 2022 한국유체기계학회 논문집 Vol.25 No.2
Generally, hydropower operates in a steady state when generating power. However, transient operations such as start-up and shut-down operations can trigger unsteadiness, which may cause accidents in severe cases. Therefore, hydropower plants include a protection device, such as a surge tank, and verifies the opening time of the guide vane at the design stage. To replace parts, such as runners for increasing the performance of the hydropower plant, sufficient verification is required. This study involves various transient operations in a Francis hydropower plant modeled using the 1-D Analysis (SIMSEN) software, which was developed for the simulations of hydraulic systems. During the simulations, the safety at power plants was examined by assessing the changes in the water level of a surge tank. Via simulations, it was verified that it operates stably even when an emergency shutdown occurs while the reservoir level is increased to the maximum. In addition, the surge tank reduced the maximum value of the head at the penstock before the turbine by 31.6% compared to that without a surge tank.
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권현진,장세명,문인식,조 용 한국전산유체공학회 2023 한국전산유체공학회지 Vol.28 No.2
In this paper, we calculated the separation distance spaced apart from the mixed water defined as hydrothermal cooling distance by 1 degree Celsius at the heat flux condition in January and August using CFD in the range of Reynolds number from 100,000 to 5,000,000. When several T-branch pipes are installed in a single pipeline system, the heating and cooling efficiency changes according to the temperature of the raw river water for a hydrothermal source. A result similar to that of the theoretical analysis was shown at Reynolds number of less than 2,500,000, but, however, it was found that heating rather than cooling occurred at 5,000,000. This is because the theoretical equations was derived from the one-dimensional assumption where the multi-dimensional effect is ignored in viscous flow. Therefore, the result is generated because the heating effect due to the skin-friction heat dissipation at pipes increases more than the cooling one by the negative heat flux. However, although the heating effect can be negligible in the flow domain in this paper, the heating effect must be considered in the entire metropolitan area, so the limitation of flow rate is inevitable to avoid the saturation of hydrothermal efficiency.
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