• 시스템엔지니어링학술지
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• 제17권2호
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• pp.9-22
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• 2021

A study on the sustainability evaluation of the requirements of the mobile industry closely related to the human factor was needed. We conducted the sustainability evaluation of the mobile industry using a quantitative evaluation method with the AHP tool and a qualitative evaluation method reflecting the technological age flow of the philosophical thoughts to improve the reliability of the evaluation results of the model verification. And this evaluation is to evaluate the consistency of the connection between the national sustainability and the mobile industry. In order to draw the conclusion of the relevance, the team member Delphi 5-point scale was used. As a result, the priority was confirmed in the national sustainable development indicator and mobile industry indicator. Quantitative and qualitative evaluation was applied to the discontinued model of mobile to derive insufficient indicators, and it was confirmed that if the indicators were improved and reflected, it would be sustainable. And in order to secure reliability and accuracy, we made a proposal to apply the systems engineering process to the development of the model evaluation field. The systems engineering technology process meets the needs and requirements of stakeholders throughout the lifecycle and it is suitable for the development model of the industry's sustainability assessment.

• 한국물환경학회지
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• 제27권1호
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• pp.61-72
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• 2011

유역 단위 수문 및 수질 평가 모형인 SWAT 모형을 이용한 유역 내 정확한 수문과 비점오염원 거동을 평가하기 위해서는 유역 적용에 앞서 모형의 정확성 평가가 우선시 되어야 한다. SWAT 모형의 수문 보정및 검정 시, Nash-Sutcliffe의 효율계수(EI)가 널리 사용되고 있다. 그러나 이러한 EI 값은 비교되어지는 값들의 범위 중 큰 값 즉, 수문 분석에 있어 고유량에 대해 민감하게 영향을 받는 것으로 알려져 있다. 그리하여 본 연구에서는 보다 정확한 수문 분석을 위해 K-means 군집화 알고리즘을 이용한 웹기반의 EI 평가시스템을 개발하였고, 이를 SWAT 모형의 수문 평가에 적용하였다. 본 연구의 결과 전체 유량의 EI 값은 높았지만, 수문성분에 따른 EI 값은 높지 않았다. SWAT 모형의 수문 보정 및 검정에 널리 활용되고 있는 SWAT auto-calibration tool은 전체 유량에 대해서는 높은 EI 값을 산정하는 것으로 보이지만, 직접유출과 기저유출 각각에 대한 유량 그룹 I 과 II 에 대해서는 대부분 음수(-)의 EI 값을 보였다. 그리하여 본 연구 결과를 통해 SWAT 모형의 수문성분 평가에 있어 보다 정확한 평가를 위해서는 직접유출과 기저유출에 대한 각각의 유량 그룹에 대해 양수(+)의 EI 값이 산정되도록 모형 보정 및 검정의 수행 필요할 것으로 사료된다.

• International Journal of Precision Engineering and Manufacturing
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• 제3권4호
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• pp.24-30
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• 2002

In grinding operations, one of the most important problems is to increase efficiency of process. In order to achieve this purpose, it is necessary to administer the tool lift of grinding wheel and to optimize grinding conditions. Frequently dressing result in lowering the process efficiency remarkably and makes production cost high. On the other hand, grinding with a worn wheel causes the workpiece surface roughness to increase and often results in the occurrence of such troubles as chatter vibration and homing.

• 한국산학기술학회논문지
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• 제9권4호
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• pp.1086-1094
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• 2008

오늘날 중소기업의 기술개발은 미래 산업에 대한 성장엔진이다. 또한 기술력 평가는 기업과 국가 경쟁력에 대한 중요한 평가 항목으로 R&D 투자를 지속적으로 확대해가고 있다. 그러나 R&D의 생산성을 제대로 측정하고 평가하는 기업은 거의 없는 것이 현실이다. 본 논문에서는 기존의 기술가치평가, 기술 평가의 연구의 한계점을 보완하는 중소기업 대상의 U-IT TE 및 PSMP 설계 Model을 제시하여 기술 환경 및 기업의 기술 관련 능력을 종합적으로 평가하는 도구로 활용하고, 기술을 정량적으로 분석 평가하고 제품 생산 완료까지의 Process를 정형화하는 Model을 제시하고자 한다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2003년도 추계학술대회
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• pp.59-65
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• 2003

Four kinds of $Si_3N_4$-based ceramic cutting tools with different sintering time were fabricated to investigante the effect of sintering time on the microstructure, mechanical properties, grain sizes and the cutting performance. An endeavor was also made to determine the relation among mechanical property, Brain size and tool life. $Si_3N_4$ home made cutting tool sintered for 1 hour under $1760^{\circ}$ temperature and 25MPa pressure showed the best cutting performance among selected ceramic tools during machining both Bray cast iron and heat treated SCM440. Multiple linear regression model was used to estimate the tool lift from mechanical property, grain size and showed good result. It was also shown that hardness imposed the biggest offect on tool life.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.1051-1055
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• 1997

Hot forging is widely used in the manufacturing of automotive component. The mechanical, thermal load and thermal softening which is happened by the high temperature die in hot forging. Tool life of hot forging decreases considerably due to the softening of the surface layer of a tool caused by a high thermal load and long contact time between the tool and workpieces. The service life of tools in hot forging process is to a large extent limited by wear, heat crack, plastic deformation. These are one of the main factors affecting die accuracy and tool life. It is desired to predict tool life by developing life prediction method by FE-simulation. Lots of researches have been done into the life prediction of cold forming die, and the results of those researches were trustworthy, but there have been little applications of hot forming die. That is because hot forming process has many factors influencing tool life, and there was not accurate in-process data. In this research, life prediction of hot forming die by wear analysis and plastic deformation has been carried out. To predict tool life, by experiment of tempering of die, tempering curve was obtained and hardness express a function of main tempering curve.

• 문화기술의 융합
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• 제8권2호
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• pp.117-129
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• 2022

다양한 학문을 넘나들며 새로운 지식과 관점을 창의적으로 추구하는 역량은 21세기 융복합시대를 살아가기 위한 기초적 소양으로 자리매김하고 있다. 다양한 창의교육 프로그램 개발에 따라 학습자의 학업성취도를 객관적이고 체계적으로 평가할 수 있는 평가도구 또한 요구되고 있다. 이에, 본 논문에서는 초·중등학생 대상 창의 융합 교육 프로그램의 평가도구로 하이퍼 블렌디드 실천모델에 기반하여 자기 평가, 동료 평가, 창의성 평가, 자기 성찰도구를 제안하였다. 개발된 평가도구는 타당도 검사를 통해 2개 문항을 수정하고 4개 문항을 삭제하여 보다 완성된 평가도구의 개발을 꾀했다. 또한, 평가도구는 전국 초·중등학생 596명을 대상으로 적용되었으며, 적용 결과는 일원배치 분산분석과 워드클라우드를 통해 분석되었다. 분석 결과, 자기 평가와 자기 성찰도구는 학년군에 따른 문항 개발이 필요할 것으로 나타났다. 더불어, 변화하는 교실 환경 속 원격 수업이나 여러 교육 활동에서 본 평가도구를 활용하기를 제안한다. 본 논문을 통해 창의 융복합 교육을 위한 평가체계 및 도구 개발에 시사점을 제공하기 바란다.

• 대한안전경영과학회지
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• 제7권3호
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• pp.47-61
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• 2005

Many researchers have proved that risk measurement of information systems is a very effective tool for improving confidence of information systems. However, information system risk in Korea still includes many subjective judgements. This study deals with applying a quantitative model to improve risk measurement of information system quality. First of all, we have come up with solutions to improve the evaluation efficiency on risk measurement. We have merged the risk guidelines of COBIT and CMM, and developed a quantified evaluation scheme that call by risk point. We have proved the validity of this model by interviews with experts and by case studies.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부 B
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• pp.612-614
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• 1998

As chip feature size decrease, interconnect delay gains more importance. A accurate timing analysis required to estimate interconnect delay as well as cell delay. In this paper, we present a timing-level delay calculation tool of which the accuracy is bounded within 10% of SPICE results. This delay calculation tool generates delay values in SDF(Standard Delay Format) for parasitic data extracted in SPEF(Standard Parasitic Exchange Format). The efficiency of the tool is easily seen because it uses AWE(Asymptotic Waveform Evaluation) algorithm for interconnect delay calculation, and precharacterized library and effective capacitance model for cell delay calculation.

• 한국병원경영학회지
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• 제23권1호
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• pp.1-15
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• 2018

Recently, the importance of emergency medical services has emerged, as rapid advances in urbanization and industrial development. Accordingly, the need for effective emergency medical services is increasing, and the evaluation of an emergengy medical services centers is conducted to meet these policy needs. The purpose of this study was to analyse the relationship between the structure and the process domain of the evaluation of an emergency medical services center based on the Donabedian's model and to verify the validity as an index of quality evaluation through the results. As a result of the analysis, there were some indicators that showed a different direction than expected, but generally there was a significant correlation between the structure and process domains of the evaluation of an emergency medical services center. This suggests that the process can be improved by improving the structure. In conclusion, as structure and process indicators in evaluation of an emergency medical services center show significant relationship, it can be evaluated as validity as a tool to measure the quality of emergency medical services.