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800㎿급 발전소 복수기의 최적 운전점 및 운전방법에 대한 연구
장철호(Cheol-Ho Jang),홍은기(Eun-Kee Hong),황광원(Kwang-Won Hwang),윤린(Rin Yun) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Along with the recent construction of a 800㎿ thermal power plant it is necessary to check the soundness of the current operation of the condenser, and to investigate the effects of vacuum level of it on the turbine efficiency for the power plant. In this study, the performances of the condenser and the turbine for the 800㎿ thermal power plant were tested based on the ASME PTC 6 and ASME PTC 12.2 with the variation of the vacuum level. When the condenser vacuum levels were 719.91 ㎜Hg, 724.5 ㎜Hg, and 729.6 ㎜Hg, the turbine efficiencies were 47.36%, 47.47%, and 47.55%, respectively. From the regression analysis of the present data, it was estimated that the optimal vacuum point is between 729 ㎜Hg and 731 ㎜Hg. When this optimal point is to be applied to the condenser, the profit of 5.5 billion won/year is expected based on the '09 caloric cost.
김병호 ( Byung Ho Kim ),감신 ( Sin Kam ),배상근 ( Sang Geun Bae ),김건엽 ( Keon-yeop Kim ),이원기 ( Won Kee Lee ),홍남수 ( Nam-soo Hong ),박형근 ( Hyeung-keun Park ),이혜진 ( Heyjean Lee ),조은정 ( Eun-jung Cho ),채성철 ( Shung C 한국보건정보통계학회(구 한국보건통계학회) 2017 보건정보통계학회지 Vol.42 No.1
Objectives: This study was conducted to investigate economic feasibility of operating Regional Cardiocerebrovascular Centers using cost-benefit analysis. Methods: The current study assessed cost and benefit data collected from nine hospitals which were designated as Regional Cardiocerebrovascular Centers between 2008 and 2010. Results: The operation of Regional Cardiocerebrovascular Centers reduced mortality rate and length of stay due to acute myocardial infarction and stroke and also decreased disability occurred after stroke. The total calculated cost of operating nine Regional Cardiocerebrovascular Centers was 19.85-22.30 billion won and the minimum benefit calculated was 23.98 billion won. Applying the maximum cost and the minimum benefit, the net benefit was 1.68 billion won, which is estimated to 190 million won per Regional Cardiocerebrovascular Center. Conclusions: The present study revealed that the operation of Regional Cardiocerebrovascular Centers was economically beneficial. The benefit would be larger if intangible benefit such as the long-term effects to community hospitals and enhancement of quality of life of patients and their families are considered.
Hong, Won-Kee,Park, Seon-Chee,Lee, Ho-Chan,Kim, Jin-Min,Kim, Seung-Il,Lee, Seung-Geun,Yoon, Ki-Joon John Wiley Sons, Ltd. 2010 The structural design of tall and special building Vol.19 No.6
<P>The authors present an experimental and analytical investigation of the modularized hybrid system (MHS) that utilizes the composite structure described in previous studies, that of a wide steel flange and precast concrete. The objective of this paper was to introduce the application of the MHS structural system to a high-rise building in which one additional floor was added while the overall building height was maintained. The 68-m-tall, 18-storey steel building was redesigned to a 19-storey building using the composite beams, which combine the merits of ductile steel and concrete components to withstand external loading while reducing floor height. The bottom flange of the steel beam is reinforced with concrete at a manufacturing plant, eliminating the use of temporary pour forms. The erection process of the composite beams is identical to that of traditional steel construction. This paper also describes more than 30 potential applications of high-rise composite construction using the MHS frames. The advantages of the MHS are presented in terms of reduced structural steel tonnage and shortened construction schedules. Copyright © 2009 John Wiley & Sons, Ltd.</P>
Electrochemical Behavior of Udenafil on Glass Carbon Electrode
( Won Sik Han ),( Joo Youn Hong ),( Jong Ki Hong ),( Jeong Hoon Kim ),( Jang Ki Kim ),( Young Hoon Lee ),( Tae Kee Hong ) 한국환경분석학회 2012 환경분석과 독성보건 Vol.15 No.1
The voltammetric behavior of udenafil on glassy carbon electrode was studied using cyclic, linear sweep and square-wave (SW) techniques. Udenafil showed an irreversible oxidation behavior in aqueous buffer solutions containing 30% (v/v) acetonitrile over the pH range of 2 to 6. The oxidation pattern of 2-(2-aminoethyl)-1-methylpyrrolidine differs from that of udenafil. On the other hand, the oxidation of udenafil resembles those of the alkoxybenzene group and 6-hydroxypurine group of udenafil and 5-(2-ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]-7-pyramidinone (EMPP). From the linear relation between the peak current and the concentration of udenafil, square wave (SW) voltammetric method for its determination in udenafil tablets was developed. For analytical purpose, one well-defined diffusion controlled voltammetric peak was obtained in 0.2 M phosphate buffer at pH 2.0. The current-concentration plot was rectilinear over the range of 5×10.7 to 5×10.5 M with correlation coefficient of 0.998.
Hong, Mi Jeong,Yoo, Seung Soo,Choi, Jin Eun,Kang, Hyo‐,Gyoung,Do, Sook Kyung,Lee, Jang Hyuck,Lee, Won Kee,Lee, Jaehee,Lee, Shin Yup,Cha, Seung Ick,Kim, Chang Ho,Lee, Eung Bae,Cho, Sukki,Jheon, S John Wiley and Sons Inc. 2018 Cancer Science Vol.109 No.12
<P>RegulomeDB is a new tool that can predict the regulatory function of genetic variants. We applied RegulomeDB in selecting putative functional variants and evaluated the relationship between these variants and survival outcomes of surgically resected non‐small‐cell lung cancer. Among the 244 variants studied, 14 were associated with overall survival (<I>P </I><<I> </I>0.05) in the discovery cohort and one variant (rs2257609 C>T) was replicated in the validation cohort. In the combined analysis, rs2257609 C>T was significantly associated with worse overall and disease‐free survival under a dominant model (<I>P </I>=<I> </I>2 × 10<SUP>−5</SUP> and <I>P </I>=<I> </I>0.001, respectively). rs2257609 is located in the <I>SLC5A10</I> intron, but RegulomeDB predicted that this variant affected <I>DRG2</I>, not <I>SLC5A10</I> expression. The expression level of <I>SLC5A10</I> was not different with the rs2257609 genotype. However, <I>DRG2</I> expression was different according to the rs2257609 genotype (<I>P</I><SUB>trend</SUB><SUP> </SUP>= 0.03) and was significantly higher in tumor than in non‐malignant lung tissues (<I>P </I>=<I> </I>1 × 10<SUP>−5</SUP>). Luciferase assay also showed higher promoter activity of <I>DRG2</I> in samples with the rs2257609 T allele (<I>P </I><<I> </I>0.0001). rs2257609 C>T affected <I>DRG2</I> expression and, thus, influenced the prognosis of early‐stage non‐small‐cell lung cancer. This study was approved by the Institutional Review Broad of Kyungpook National University of Hospital (Approval No. KNUMC 2014‐04‐210‐003).</P>
Hong, Won-Kee,Park, Seon-Chee,Kim, Jin-Min,Lee, Seung-Geun,Kim, Seung-Il,Yoon, Ki-Joon,Lee, Ho-Chan John Wiley Sons, Ltd. 2010 The structural design of tall and special building Vol.19 No.3
<P>An experimental investigation of composite beams composed of wide flange steel and precast concrete is presented. The bottom flange of the steel section is encased in precast concrete. Utilizing the merits of both steel and concrete material, the size of the steel beams can be reduced without sacrificing performance. The bottom flange of the steel beam is reinforced with concrete at a manufacturing plant, eliminating the use of temporary pour forms. The composite beams were tested to investigate how the size of the wide flange steel and how the top and bottom reinforcements influence the behaviour of the beams. Flexural load carrying capacity, load displacement relationships and failure modes were examined. The test specimens were T-shaped composite beams with slabs, each measuring 10-m long. The flexural moment strength of all of the composite beams—at both the yield limit state and the maximum load limit state—was measured and compared with the analytical flexural capacity.</P><P>The stiffness degradation, ductility and dissipating energy capabilities of the composite beams were investigated based on the hysteresis curves. The composite beams tested in this study successfully reduced both the floor height of the building and the size of the steel beams needed to meet code requirements. Copyright © 2008 John Wiley & Sons, Ltd.</P>
Algorithms for in-situ production layout of composite precast concrete members
Hong, Won-Kee,Lee, Goonjae,Lee, Sungho,Kim, Sunkuk Elsevier 2014 AUTOMATION IN CONSTRUCTION - Vol.41 No.-
<P><B>Abstract</B></P> <P>In general, precast concrete (PC) construction is preferred to reduce construction time, improve the quality of buildings and reduce costs. This type of construction consists of in-plant or in-house production, transportation and on-site erection processes. However, the PC construction method based on in-plant production is less effective in terms of cost compared to an in-situ construction method. According to previous studies in Korea, in-plant production cost of PC members accounts for 75–77% of total cost of PC framework, transportation cost is 7–10% and erection cost is 15–17%. If qualitative in-situ production is possible, more than 10% of in-plant production cost and 7–10% of the transportation cost can be reduced, resulting in better cost competitiveness. Yet, in-situ production of PC members has complicated issues such as securing site traffic and resolving interference with other work. This study is intended to develop algorithms that can quickly establish a production layout plan by considering in-situ production factors affecting composite precast concrete members. Usefulness of the developed algorithms has been demonstrated through a case study.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The algorithms for in-situ production layout of CPC components are developed. </LI> </UL> </P>
Design of Efficient Cache Structure for VLIW
Hong, Won-Kee,Kim, Shin-Dug 연세대학교 아식설계공동연구소 2000 Journal of the Research Institute of ASIC Design Vol.7 No.1
In order to design an efficient cache structure for VLIW architecture, both the memory utilization and the instruction fetch overhead must be addressed. However, the existing caches do not succeed in satisfying these requisite at the same time. In the packed cache, higher memory utilization can be achieved only at the cost of instruction fetch overhead, while in the unpacked cache, the fixed size instruction can simplify the instruction fetch but aggravate the memory utilization. In this paper, a new cache structure called partial-packed cache is proposed to reduce instruction fetch overhead and at the same time achieve high memory utilization. It contains instructions, each of which consists one or more fixed size sub-instruction. The potentials of the partial-packed cache for performance improvement is examined via analytical model. The experimental results show that the best performance can be achieved in the memory system composed of the partial-packed cache as the 1st level cache and the full-packed cache as the 2nd level cache.