보조동력용 마이크로터빈 엔진에 대한 과도성능 해석

손호재(Ho-Jae Son),김수용(SooYong Kim) 한국추진공학회 2007 한국추진공학회지 Vol.11 No.3

스팀 에젝터에 의한 강제 증발 방식의 냉각 특성에 관한 연구

손호재(H. J. Son),정효민(H. M. Jeong),이윤환(Y. H. Lee),김영근(Y. G. Kim) 한국동력기계공학회 2006 동력시스템공학회지 Vol.10 No.2

A Study of Operating the Engineering Accreditation System to Contribute to Improving Rate of Employment

Ho-Jae Son(손호재) 한국공학교육학회 2016 공학교육연구 Vol.19 No.2

The employment rate of a college has long been one of the most important elements in college survival strategies. Employment rates may not be key to colleges’ survival in other countries, but they are fundamental to colleges in Korea as seen in the Korean government-led National Competency Standard (NCS), which has been underway since its introduction to colleges in Korea. Against this backdrop, if the engineering accreditation system can contribute to improving employment rate in this context, it can take root more quickly. The process conducive to improving employment rates can be classified as both direct and indirect methods. With dwindling school-age population having impacts on colleges and universities, the environment and the education directions of colleges have rapidly been shifting since the introduction of the NCS. Therefore, various survival strategies for colleges need to be developed. An indicator of employment rate of college graduates is among the most important things during this transition process. The Department of Mechanical Engineering at Koje College has consistently shown good records during the past 5 years by matching the accreditation schemes and employment strategies. The department will help put in place the engineering technology education accreditation system at the college through its various innovative and effective programs. To formulate a better employment strategy, it is needed to reflect and consolidate the engineering accreditation scheme into the existing employment policy of college. In short, this paper examines both the engineering accreditation scheme and the employment policy in ways that helps produce a coupling matrix structure. This study looks into the measures for improving employment rates by better adjusting the engineering education methods under the accreditation scheme.

2압, 증기분사 복합발전 사이클에 대한 성능해석

김수용,손호재,박무룡,윤의수,Kim, Su-Yong,Son, Ho-Jae,Park, Mu-Ryong,Yun, Ui-Su 한국기계연구원 1997 硏究論文集 Vol.27 No.-

Combined cycle power plant is a system where a gas turbine or steam turbine is used to produce shaft power to drive a generator for producing electrical power and the steam from the HRSG is expanded in a steam turbine for additional shaft power. Combined cycle plant is a one from of cogeneration. The temperature of the exhaust gases from a gas turbine ranges from $400^\circC$ to $600^\circC$, and can be used effectively in a heat recovery steam generator to produce steam. Combined cycle can be classed as a "topping(gas turbine)" and a "bottoming(steam turbine)" cycle. The first cycle, to which most of the heat is supplied, is called the topping cycle. The wasted heat it produces is then utilized in a second process which operates at a lower temperature level and is therefore referred to as a "bottoming cycle". The combination of gas/steam turbine power plant managed to be accepted widely because, first, each individual system has already proven themselves in power plants with a single cycle, therefore, the development costs are low. Secondly, the air as a working medium is relatively non-problematic and inexpensive and can be used in gas turbines at an elevated temperature level over $1000^\circC$. The steam process uses water, which is likewise inexpensive and widely available, but better suited for the medium and low temperature ranges. It, therefore, is quite reasonable to use the steam process for the bottoming cycle. Only recently gas turbines attained inlet temperature that make it possible to design a highly efficient combined cycle. In the present study, performance analysis of a dual pressure combined-cycle power plant is carried out to investigate the influence of topping cycle to combined cycle performance.

Circular-to-Rectangular Transition Duct 내부의 3차원 유동장에 관한 연구

조수용,정희택,손호재,Jo, Su-Yong,Jeong, Hui-Taek,Son, Ho-Jae 한국전산유체공학회 1998 한국전산유체공학회지 Vol.3 No.2

Predictive behaviors by the extended k-${\varepsilon}$ turbulence model and the standard k-${\varepsilon}$ turbulence model are compared. Grid dependency is tested with the H-type grid as well as the O-type grid. Computations have been performed on a circular-to-rectangular transition duct. The Reynolds number is 390,000 based on the bulk velocity at the inlet. The computed axial velocity contours, transverse velocity profiles, static pressure contours, peripheral skin friction coefficient, peripheral wall static pressure distributions and turbulence kinetic energy have been compared with experimental results. The computed results than those obtained with the standard k-${\varepsilon}$ turbulence model. Comparing to the computed results obtained with the H-type grid and O-type grid, those with H-type grid seem to agree well with experimental results.

발전용 가스터빈에서의 Recuperative 사이클 적용성 검토

김수용(SooYong Kim),손호재(Ho-Jae Son),골든베르크(Victor Goldenberg) 한국추진공학회 2005 한국추진공학회 학술대회논문집 Vol.2005 No.4

전시사업관리 프로세스 및 수행체계구성에 관한 연구 - Ⅰ

홍승일(Hong, Seung-Il),손호재(Son, Jae-Ho),고재민(Ko, Jae-Min) 한국실내디자인학회 2010 한국실내디자인학회논문집 Vol.19 No.1

At present, the Korean display industry lacks significantly in qualitative achievements when compared to quantitative achievements. Of course, there are various systems established according to the developments of display design organizing methods, production, and installing methods through some preceding studies related to display, but it is true that the wholistic management through display business management precess which is prerequisite for this field is now considered yet. This has led to consistent and repetitive limitations, although many have undergone numerous trials and errors, along, along with related conflicts during implementing display business. Accordingly, organizing process and system for display business management field is the most field to be studied in order to not follow suit of the existing problems and look back on the failure factors of past display business. This study is focused on studying stage-to-stage research on organizing process and system for display business management, and aims to provide basic information for a more efficient management which can be realized during future business implementation for display culture facilities. The followings are the conclusions for this study. First, in order to successfully implement display business, the role of display business management is crucial, and the related need for display business management operations was proved. Second, the viability of ‘Check-List for examining displaying product designs, production and installment’ was verified, along with suggestions for additional factors to be considered in the examining check-list. Finally, third, the analyzing process of this study is focused on analyzing the facilities according to justifiable analysis factors. However, there are limitations such as coming up with subjective facts which can be known through naked eyes. Thus, the necessity for additional researches which can supplement the limitations of this study was found.

Circular-to-Rectangular Transition Duct 에서의 3차원 유동장에 관한 연구

조수용(Soo-Yong Cho),손호재(Ho-Jae Son) 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-

The purpose of this study is to compare the predictive behaviors of the extended k-ε; turbulence model and the standard k-ε turbulence model. Grid dependency is tested with the H-type grid and the O-type grid. Computations have been performed for a circular-ta-rectangular transition duct. Numerical results for several sections along the streamwise have been obtained to compare with experimental results. The Reynolds number is 390,000 based on the bulk velocity at the inlet. The computed axial velocity contours, transverse velocity profiles, static pressure contours, peripheral skin friction coefficient, and peripheral wall static pressure distributions have been compared with experimental results. The computed results obtained with the extended k-ε turbulence model show better agreement with experimental results than those obtained with the standard k-ε turbulence model Comparing to the computed results obtained with the H -type grid and O-type grid, those with H-type grid agree well with experimental results.

직각분지관의 3차원 층류유동 수치해석

김영목(Y.-M. Kim),손호재(H.-J. Son) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-

Numerical investigations of three-dimensional laminar flows in a 90-degree T-branch of square cross-section were carried out. The incompressible Navier-Stokes equations in generalized curvilinear coordinates, using a pseudocompressibility approach for continuity equation, were solved by the implicit, approximately factored scheme of Beam and Warming in the framework of multi-block grids. Computation of a twodimensional bifurcation flow was in excellent agreement with experimental measurements available in the literature for stream wise velocity profiles in the main duct. Then, effects of branch to main flow rate ratios and inlet Reynolds numbers on the main duct flowfields were studied in the laminar range. The computed results revealed significant influence of the branch flow rate ratio on the flow characteristics of T-branch.

Circular-to-Rectangular Transition Duct 내부의 3차원 유동장에 관한 연구

조수용(S. Y. Cho),정희택(H. T. Chung),손호재(H. J. Son) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.3 No.2

Predictive behaviors by the extended k-ε turbulence model and the standard k- e turbulence model are compared. Grid dependency is tested with the H-type grid as well as the O-type grid. Computations have been performed on a circular-to-rectangular transition duct. The Reynolds number is 390,000 based on the bulk velocity at the inlet. The computed axial velocity contours. transverse velocity profiles, static pressure contours, peripheral skin friction coefficient, peripheral wall static pressure distributions and turbulence kinetic energy have been compared with experimental results. The computed results obtained with the extended k-ε turbulence model show better agreement with experimental results than those obtained with the standard k-ε turbulence model. Comparing to the computed results obtained with the H-type grid and O-type grid, those with H-type grid seem to agree well with experimental results.