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스토커형 저공해 소각로 설계를 위한 비반응 유동해석에 관한 연구
전영남,오현명,김미환 조선대학교 환경공해연구소 2000 環境公害硏究 Vol.16 No.1
The numerical simulation of non-reactive turbulent model and cold flow experiment were carried out to propose the incinerator type for the domestic refuses and to investigate the design factor and operating conditions. The "standard stoker incinerator" proposed in this study was modified from central flow type with carrying out by material and numerical simulations repeatedly. The stoker has the characteristics of good mixing between refuse and hot combustion gas in primary combustion chamber and between unburned gas inflowing and secondary air jet in secondary chamber. Also there was no recirculation zone in secondary chamber so that mixing time was increased with higher residence time. Therefore this incinerator could be possible for domestic refuse to burn up with the low emission and high efficiency combustion. Parametric screening studies were achieved in standard stoker incinerator. The parameters are stoker type, secondary air inflow type, secondary air injection angles, secondary injection air flow rate and primary air inflow rate. The results are as follows; 1. In the same conditions with standard stoker incinerator, flow pattern was not almost changed by changing inclined stoker type. 2. The injection potion and angle of secondary air had an effect on flow field in secondary combustion chamber. 3. Flow pattern was not almost changed with the variation of the flow rate of primary and secondary air injection. The results of parametric studies said that the main factors for the design are the incinerator configuration of secondary combustion chamber and/or the position and angle of secondary air injection.
스토커형 저공해 소각로 설계를 위한 비반응 유동해석에 관한 연구
전영남,오현명,김미환 조선대학교 환경연구소 2000 環境硏究 Vol.16 No.1
The numerical simulation of non-reactive turbulent model and cold flow experiment were carried out to propose the incinerator type for the domestic refuses and to investigate the design factor and operating conditions. The "standard stoker incinerator" proposed in this study was modified from central flow type with carrying out by material and numerical simulations repeatedly. The stoker has the characteristics of good mixing between refuse and hot combustion gas in primary combustion chamber and between unburned gas inflowing and secondary air jet in secondary chamber. Also there was no recirculation zone in secondary chamber so that mixing time was increased with higher residence time. Therefore this incinerator could be possible for domestic refuse to burn up with the low emission and high efficiency combustion. Parametric screening studies were achieved in standard stoker incinerator. The parameters are stoker type, secondary air inflow type, secondary air injection angles, secondary injection air flow rate and primary air inflow rate. The results are as follows: 1. In the same conditions with standard stoker incinerator, flow pattern was not almost changed by changing inclined stoker type. 2. The injection potion and angle of secondary air had an effect on flow field in secondary combustion chamber. 3. Flow pattern was not almost changed with the variation of the flow rate of primary and secondary air injection. The results of parametric studies said that the main factors for the design are the incinerator configuration of secondary combustion chamber and/or the position and angle of secondary air injection.
정영석,장우석,류명춘 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(A)
As the user of web glow rapidly, technologies to reduce web latency become important. Proxy caching is one of the most effective and widely implemented mechanism by prefetching documents on the proxy server, better cache hit rate can be achieved and the clients feel faster response time. In this paper, we proposes a model for evaluating the performance of proxy server in WWW.
규칙기반 시스템과 데이터베이스 관리 시스템의 통합 기법에 관한 연구
류명춘,정영석,오주환 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(B)
It is useful of the integration of rule systems into DBMS. Because rule-based system supports a eminent inference and analysis power and relational DBMS manages efficiently large data supporting consistency and independency. In this paper, we compares and analyzes the three approach for the integration of rule system into DBMS. Also we design inference system for rule-based database system.
걷기운동이 비만중년여성의 건강관련체력과 피하지방두께변화에 미치는 영향
원영두,문현화,정천모,신명건 朝鮮大學校 스포츠科學硏究所 2007 스포츠科學硏究 Vol.18 No.-
The purpose of this study was to analyze the effect of walking exercise on health-related physical fitness and Subcutaneous fat thickness in obese middle-aged women. SPSS 11.0 was used to calculate mean and SD, and ANCOVA was conducted to examine the group difference between paired sample t-test and pre-test and post-test. The level of significance was set at a=.05. 1. The change of health-related physical fitness was examined, In the EG, there was no statistically significant difference in muscular strength, but there was statistically significant difference in muscle endurance(p<.05), f1exibi1ity(p<.01), and cardivascular endurance(p<.OOl). In the CG, there was no statistically significant difference in all factors. 2. The change of body composition was examined. In the EG, there was statistically significant difference in weight(p<.001) and % body fat(p(.001), but 3. The change of skinfold thickness was examined. In the EG. there was statistically significant difference in triceps. subscapular, midaxillary, abdominal, suprailliac, and popliteal muscles(p<.001) and front thigh(p(.01), but there was no statistically significant difference in medial calf. In the CG, there was no statistically significant difference in all regions. In conclusion, as results of conducting the 12-week walking exercise program for obese middle-aged women, it was found that the program improved health-related and effectively reduced % body fat and skinfold thickness. It is recommended that middle-aged women should do low intensity endurance exercise rather than excessive exercise. Further study should conduct a walking exercise program and a dietary cure together to provide obese middle-aged women with a more effective program.
셀룰러 망에서 이동국 속도와 방향성을 고려한 효율적인 핸드오프율
정역석,류명춘,오주환 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(B)
In this paper we model each cell as a set of the triangle and present the handoff area using a subset of the triangle. So, handoff area can be presented depending on radius-division degree of a cell easily. we predict that a mobile station can go our or not the current cell depending on mobile station' speed, direction. We propose a calculation method of handoff rate and handoff call number using the mobile station' moving speed, direction.
CDMA 셀룰러 시스템에서의 호 탈락율 개선을 위한 향상된 핸드오프 호 제어 기법
정영석,류명춘 경운대학교 산업기술연구소 2000 産業技術硏究論文誌 Vol.3 No.1(B)
In this paper, we propose a enhanced handoff call control scheme(EHCCS) for reducing call blocking rate in CDMA cellular systems. Since two or three traffic channels are assigned to a mobile station(MS) during handoff period, the utilizations efficiency of traffic channels decreases. In DCMA cellular systems, a MS requests a soft handoff to a neighbor base station(BS) whenever the received pilot strength from the neighbor BS exceeds the predetermined handoff threshold, even though the MS is not actually approaching the neighbor BS. In this case, there exists unnecessary soft handoff call requested by a MS moving away from the neighbor BS. In the proposed scheme, a neighbor base station ignores unnecessary soft handoff calls requested by MS which are not actually approaching the neighbor BS. The performance of the proposed scheme is evaluated by computer simulation. The results show that the call blocking rate for new calls and handoff calls is reduced.