• International Journal of Aeronautical and Space Sciences
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• 제14권2호
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• pp.162-171
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• 2013

A general purpose aircraft mission performance analysis program has been developed. The program can be used in design mode or in analysis mode. Fuel weight for a given mission profile can be estimated when the design mode is chosen, while mission time or mission range for a given fuel can be estimated when the analysis mode is chosen. The mission analysis program is written with JAVA and includes GUI(Graphic User Interface) for users' conveniences. With a proper combination of databases for propulsion, aerodynamics and weight, the program can be configured to compute the performance of any type of aircraft. The program is validated by comparing its results with the results of a well known performance analysis program by ADD(Agency for Defense Development).

• 한국유체기계학회 논문집
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• 제18권4호
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• pp.22-29
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• 2015

In this study, an in-house program to predict steady state operation of micro gas turbines is constructed using MATLAB. The program consists of two parts: design and off-design simulations. The program is fully modular in its structure, and performance of each component (compressor, combustor, turbine, recuperative heat exchanger and pipe elements) is calculated in a separate calculation module using mass and energy balances as well as models for off-design characteristics. The off-design modules of compressor and turbine use performance maps, which are program inputs. The off-design operation of a micro gas turbine under development was predicted by the program. The prediction results were compared with those by commercial software, and the validity of the in-house program was confirmed.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.1595-1600
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• 2007

It is necessary a simple helicopter design and performance analysis program for a stage of helicopter conceptual design. To meet that needs, we have developed a program which is simply used to estimate helicopter configuration and performance. The program developed by this study is composed of Requirement, Mission profile Analysis, Size, Aerodynamic, Trim, Propulsion, Weight, and Performance modules, and each modules carry out operations for a given flight condition. In this study, we validate this analysis program in 9,500 1bs and 22,000 1bs helicopters and estimate design configuration and performance of 16,000 1b helicopter. And We can use this program to optimization process for Helicopter MDO framework.

• Journal of Mechanical Science and Technology
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• 제14권11호
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• pp.1296-1304
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• 2000

A program of steady-state and transient performance analysis for a 200kW-class small turboshaft engine with free power turbine was developed. An existing turbojet engine was used for the gas generator of the developed turboshaft engine, which was modified to satisfy performance requirements of this turboshaft engine. To verify the accuracy of steady-state performance program for this engine: the program was applied to the gas turbine test unit of the same type, and the analysis results were compared with experimental results. The developed transient performance analysis program using the CMF (Constant Mass Flow) method was utilized to analyze the cases of step increase and ramp increase of the fuel.

• 한국정보처리학회논문지
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• 제6권5호
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• pp.1263-1271
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• 1999

This paper designs the performance analysis layer for the various performance analysis of parallel programs using event expressions are similar to the normal program language to analyze the events which display a dynamic state exchange of a program. The event expressions suggest operations for overloading and functions which are needed in performance analysis, such as a filtering operation, data format translation functions, performance analysis, static functions, and etc. By using the event expressions, the programmer can modify the event trace data to analyze the performance and analyze more easily and variously than the pre-developed tools.

• 대한기계학회논문집B
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• 제33권2호
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• pp.141-148
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• 2009

Axial-flow compressor is one of the most important parts of gas turbine units with axial turbine and combustor. Therefore, precise prediction of performance is very important for development of new compressor or modification of existing one. Meanline analysis is a simple, fast and powerful method for performance prediction of axial-flow compressors with different geometries. So, Meanline analysis is frequently used in preliminary design stage and performance analysis for given geometry data. Much correlations for meanline analysis have been developed theoretically and experimentally for estimating various types of losses and flow deviation angle for long time. In present study, meanline analysis program was developed to estimate compressor losses, incidence angles, deviation angles, stall and surge conditions with many correlations. Performance prediction of one stage axial compressors is conducted with this meanline analysis program. The comparison between experimental and numerical results show a good agreement. This meanline analysis program can be used for various types of single stage axial-flow compressors with different geometries, as well as multistage axial-flow compressors.

• 한국콘텐츠학회논문지
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• 제20권12호
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• pp.287-300
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• 2020

본 연구는 노인복지관이 운영하는 실버 오케스트라 프로그램의 실천적 개선 방향을 도출하기 위하여 운영 속성에 대한 중요도-만족도 분석(IPA)을 수행하였다. 우리나라의 춘천동부노인복지관이 운영하는 '춘천 실버 오케스트라' 프로그램을 대상으로 실버회원 그룹(N=53)과 프로그램 운영자 그룹(N=32)을 조사 대상자로 선정하였다. '지역사회와의 연계', '예산 운영', '프로그램 운영', '인력 운영', '홍보전략', '프로그램 운영환경'을 포함하는 6개의 평가영역으로 구성된 평가지표를 설계하였다. 그리고 평가영역에 대하여 22개의 평가항목을 구성하였다. 본 연구의 결과, 실버회원 그룹에서는 '인력 운영'이 중요도와 만족도에서 가장 높은 우선순위를 가지는 것으로 나타났다. 프로그램 운영자 그룹에서는 '예산 운영'과 '인력 운영'이 중요도와 만족도에서 각각 가장 높은 우선순위를 차지하였다. IPA 매트릭스 분석을 통하여 나타난 연구 결과를 기반으로, 성공적인 프로그램 운영을 위해서는 실버회원 그룹과 프로그램 운영자 그룹의 관점에서 현상유지 및 강화, 집중투자 및 개선, 낮은 우선순위, 그리고 과잉노력 지양으로 영역화된 프로그램 운영 속성에 대해서 서로 차별화된 노력과 관심을 지속적으로 가져야 한다는 시사점을 제공한다.

• 영재교육연구
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• 제26권3호
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• pp.427-447
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• 2016

이 연구의 목적은 IPA 기법을 활용하여 과학영재교육 수혜자들이 경험한 교육프로그램의 중요도와 만족도에 대한 인식을 분석하고, 과학영재들의 요구에 맞는 교육프로그램 제공을 위한 개선사항을 도출하는 것이다. 이를 위하여 과학영재교육 수혜자 288명을 대상으로 설문 및 심층면담을 실시하였다. 수집된 자료는 SPSS 20.0을 이용하여 교육프로그램에 대한 중요도와 만족도의 차이를 분석하기 위해 대응표본 t-검정을 실시하였고, 교육프로그램 개선 사항을 탐색하기 위해 중요도-만족도 분석(Importance-Performance Analysis; IPA)을 실시하였다. 분석 결과 과학영재교육 수혜자들은 대체로 기존의 영재교육 프로그램에 대한 중요도보다 만족도가 낮게 나타났다. 또한 학교 급에 따라 요구하는 교육프로그램의 유형에 차이가 있었다. 즉, 초등학교 단계일수록 현장견학, 캠프 등 체험 중심의 교육, 중학교 단계는 탐구활동 중심의 교육, 고등학교 단계는 연구 중심의 교육을 선호하는 것으로 나타났다. 그러나 과학영재들의 진로탐색이나 리더십 향상을 위한 교육프로그램은 학교 급에 관계없이 시급하게 개선이 필요한 유형으로 인식하고 있었다. 이 연구는 착수효과를 고려하여 과학영재들이 요구하는 교육프로그램 유형을 분석했다는 점에서 의의가 있다.

• 공학교육연구
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• 제14권3호
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• pp.45-54
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• 2011

The purpose of this study is to analyze performance problems in establishing and improving program educational objectives (PEO) and to set up action strategies for the civil engineering program at the A university. To fulfill the purpose, according to the typical needs analysis model, research problems were defined, current conditions and desired conditions were identified, discrepancies and their reasons were examined, and action strategies were derived. Current conditions and desired conditions were identified by analyzing the A civil engineering program's self study report, conducting surveys and interviews with constituents. After the discrepancies and the reasons were examined, performance problems and field force analysis were conducted to draw short term and long term action strategies to improve PEO. Short term action strategies were to announce PEO to current students, to hold faculty seminars to establish and to improve PEO, to renew the list of constituents regularly, to composite an annual milestone, to define roles of the committees, and to enforce educational opportunity toward industrial advisory board members. For the long term strategies, improvement and documentation of PEO assessment system, collection and analysis of constituents' suggestions, establishment of effective accreditation support system, and arrangement of compensation system for the faculties who are in charge of engineering education accreditation responsibility.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2003년도 제20회 춘계학술대회 논문집
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• pp.110-114
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• 2003

본 연구에서는 GUI환경을 제공하는 SIMULINK를 이용한 터보제트 엔진의 성능모사 프로그램을 새로이 제안하였다. SIMULINK 성능모사 프로그램에 의한 성능해석 결과는 기개발된 FORTRAN 성능모사 프로그램의 결과와 비교하였다. 비교결과 SIMULINK 프로그램과 FORTRAN 프로그램에 의한 결과 사이에 다소 큰 차이를 보이는데 이는 구성품간 조합방법의 차이에 기인한 것으로 추정되며, 추후 개선을 할 예정이다.