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.

보조동력용 마이크로터빈 엔진에 대한 과도성능 해석

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

The easiest way to see the phenomena of compressor surge is to show the static and dynamic operation characteristic on the map. Its operation zone will be restricted by the surge limit and, static and transient process must have some margin for it. Effect of rotor moment of inertia, air/gas volumes and heat transfer are factors to cause the transition from the static line. In case a large volume such as heat exchanger exists in the system it will exert a substantial influence to dynamic characteristics. In the present paper, influence of air volume bled from the compressor exit on transient process is investigated with an example of an auxiliary power unit micro-turbine engine. Turbine mass, pressure ratio, rotation speed, power and moment are calculated based on mass and work conservation. Result from the present study can give guidance to design the control system. A computer program is developed to calculate the dynamic process using the MathCAD commercial software.

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.

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.

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.

발전용 가스터빈에서의 Recuperative 사이클 적용성 검토

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

A General Understanding of Turbulence in Point of an Educational View

손호재 거제전문대학 1999 論文集 Vol.8 No.-

새로운 방법의 Length Scale 정의가 Averaged Navier-Stokes 방정식을 구하기 위해 제안되었다. 새로운 방법을 사용하는 동기는 어떻게 하면 쉽게 Length Scale를 정의할 수 있을까 하는 관찰을 통해서이다. 논문은 또한 난류흐름을 일반적으로 이해하는 방향으로 기술되었다. 대부분의 난류모델에 관한 연구가 난류 본래의 특징보다는 Parameter의 값을 어떤 값으로 선택했는가 하는 연구에 국한되어왔다. 난류흐름을 이해하기 위해 변수의 변화가 아니라 물리적 의미가 보다 중요한 것이다. 그러므로 쉽게 물리적으로 난류의 본래의 의미로 설명하는 것이 교육적으로 매우 중요한 의미가 있다. 서로 다른 3종류의 곡면을 가진 Duct에 대한 해답을 구하기 위해 여러 가지 Boundary Condition이 CFD(Computational Fluid Dynamics)관점에서 또한 제안되었다.