• 드라이브 ㆍ 컨트롤
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• 제14권3호
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• pp.8-17
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• 2017

With automobiles sharply increasing in numbers worldwide, we are faced with critical social issues such as traffic accidents, traffic jams, environmental pollution, and economic inefficiency. In response, research on ITS is promoted mainly by regions with advanced automotive industry such as the U.S., Europe, and Japan. While Korea is working on moving forward in the global market through developing and turning to global standards systems related to ASV (Advanced Safety Vehicle), the country is not fully prepared for such projects. The purpose of ACC (Adaptive Cruise Control) is to control a vehicle's longitudinal speed and distance and minimize driver workload. Such a system should be valuable in preventing accidents, as it reduces driver workload in the 21st-century world of telematics created by development of the automobile culture industry. In this light, the thesis presents a method to test and evaluate ACC system and a mathematical method to assess distance. For the proposed test and evaluation, theoretical values are tested with vehicle test and a database is acquired, by using vehicles equipped with an ACC system. Theoretical evaluation criteria for developing ACC system may be used and scenario-specific evaluation methods may find useful application through testing the formula proposed by comparing the database and mathematical method.

• 약학회지
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• 제55권5호
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• pp.411-418
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• 2011

The dissolution test method and an analytical procedure by HPLC were developed and validated for nafronyl oxalate capsules and tramadol hydrochloride capsules. These drugs were not yet characterized by the dissolution specifications in the Korean Pharmaceutical Codex. So, with each reference and test drugs, we did the preliminary and standard experiments based on the Korean Pharmacopeia Guideline of dissolution testing for solid oral dosage forms. The dissolution test for nafronyl oxalate capsules was carried out under sink conditions as follows: dissolution medium phosphate buffer pH 6.8, paddle rotation speed 100 rpm and vessel volume 900 ml. More than 80% of its label amount was released within 30 min in this method. Also the dissolution test for tramadol hydrochloride capsules was carried out under sink conditions as follows: dissolution medium water, paddle rotation speed 50 rpm and vessel volume 900 ml. More than 90% of its label amount was released within 15 min in this method. The dissolution samples were analyzed with a validated HPLC analytical procedure. The analytical methodology showed acceptable values in terms of specificity, linearity, precision and accuracy. The dissolution test methods described above were adequate for the purpose and may be proposed as a pharmacopeial standard to assess the performance of nafronyl oxalate capsules and tramadol hydrochloride capsules. Furthermore, the outcomes of this study were expected to help create an environment where safe and high quality drugs would be distributed on the domestic market making contributions to advancing public health.

• 연구논문집
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• 통권28호
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• pp.229-238
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• 1998

비파괴평가의 대상이 되는 소재나 부품은 관련 표준시험편을 이용하여 평가되고, 표준시험편은 평가대상과 동일 또는 유사한 재질로 제작되어야 한다고 규정하고 있다. 따라서 비파괴평가가 요구되는 소재나 부품을 생산, 외국에 수출하기 위해서는 반드시 공인된 설비와 품질관리 체계로부터의 인증이 선행되어야 한다. 본 논문에서는 초음파를 이용한 항공기용 Udimet 720Li 디스크의 비파괴평가를 위하여 ASTM에 규정되어 있는 4340강 초음파 표준시험편의 적용타당성을 제시하였다. 현미경 시험을 통하여 Udimet 720Li 합금의 미세조직을 규명하고, 고출력 초음파 분석시스템을 이용한 펄스의 위상값을 측정하는 방법으로 4340강 표준시험편 및 Udimet 720Li 합금의 초음파 속도와 감쇠값을 구하였다. 결론적으로 4340강 초음파 표준시험편이 Udimet 720Li 디스크의 평가를 위한 표준시험편으로 사용될수 있음을 증명하였다.

• The Journal of the Acoustical Society of Korea
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• 제15권4E호
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• pp.28-36
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• 1996

In this paper, we propose a new evaluation methodology which can more clearly show the performance of the allophone modeling algorithm generally used in large vocabulary speech recognition. The proposed evaluation method shows the running characteristics and limitations of the modeling algorithm by testing how the variation of phonetic environments of training data affects the recognition performance and the desirable number of free parameters to be estimated. Using the method, we experiment results, we conclude that, in vocabulary-independent recognition task, the phonetic diversity of training data greatly affects the robustness of model, and it is necessary to develop a proper measure which can determine the number of states compromizing the robustness and the precision of the HMnet better than the conventional modeling efficiency.

• 한국문헌정보학회지
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• 제36권4호
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• pp.311-329
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• 2002

본 연구에서는 최신의 정보기술을 적용한 XML 기반 충남대학교 전자도서관 웹사이트를 대상으로 사용성 평가를 실시하였다. 사용성 평가는 로그파일 분석, 온라인 설문조사 그리고 발견평가의 3가지 방법을 적용하였다. 본 연구에서는 사용자 입장에서의 대학도서관 웹사이트 서비스의 문제점을 분석$\cdot$평가하여 개선 방안을 제시함으로써 이용자 서비스의 품질 향상을 제고할 수 있는 근거를 마련하고자 한다.

• 한국생산제조학회지
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• 제5권4호
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• pp.38-46
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• 1996

This paper discusses the feasibility of Ultrasonic Nondestructive Evaluation (UNDE) technique for sport weld quality. Ultrasonic c-scan image assisted by image processing technique was used for Nondestructive Evaluation(NDE) of spot weld quality. Ultrasonic testing results obtained were confirmed and compared by Optical Microscope and SAM(Scanning Acoustic Mircroscope) observation of the spot-weld cross section, The results show that the nugget dinameter can be successfully measured with the accuracy of 0.5mm. It was ascertained that ultrasonic c-scan technique is very effective method for the sake of the approach to the quantitative measurement of nugget diameter and the discrimination of the corona bond from nugget. Additional support for the above conclusions is provided by the results for galvanized steel. The ultrasonic results for galvanized welds generally correspond to the results for uncoated steel. Finally, it was found that the above-mentioned technique can be sufficiently applied to NDE method for securing the Quality Assurance(QA) of spot welded products in production line.

• 한국자동차공학회논문집
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• 제9권3호
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• pp.164-172
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• 2001

Various HILS systems for developing and testing vehicle mechatronic systems have been proposed and constructed during the last few years. However, performance of those systems have not been evaluated in a systematic way. Based on the transfer function approach, this paper presents a method far evaluating performance such as stable dynamic simulation range of a proposed steering HILS system. In the evaluation, we have investigated effects of time delays that exist in the real-time dynamic simulation, additional actuators, and data transmission on the stable dynamic simulation range, simulation frequency range, and steering feel. This evaluation methodology may be useful to help engineers develop a HILS system for their own purposes.

• 전자공학회논문지B
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• 제30B권3호
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• pp.50-59
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• 1993

There is basic problem with the current evaluation method for character recognition systems. The current method evaluates the average recognition rate by applying the test data to the target system. The average recognition rate tells no more than and no less than the overall performance and it depends on the data. In this paper we propose a testing method which will analyze the target system and point out its strong points and weak points. This can be made possible through using the data which are generated cy distorting the standard character images according to a carefully controlled manner. This paper will describe how to automatically generate such distorted images. Also we will show the method is actually effective and useful by applying it to evaluating existing recognition algorithms.

• 비파괴검사학회지
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• 제18권4호
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• pp.271-277
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• 1998

비파괴검사는 검사 자체와 검사 결과를 해석 또는 평가하는 것으로 크게 둘로 나눌 수 있다. 검사자체는 전자 기술 수준의 발전에 따라 많은 양을 단시간 내에 정밀하게 수행할 수 있으나 검사 결과 발견된 지시(indication)가 결함인지 혹은 이와 유사한 거짓 결함인지를 확인하기는 대단히 어려운 일이다 초음파 탐상의 경우 검사 결과 결함의 형상을 정확하게 인식하기 위해 컴퓨터를 활용한 다양한 첨단 신호 해석 기술이 개발되어 일부 활용되어오고 있는데 본 논문에서는 신호처리 기법의 하나인 집속 신호합성 기법(synthetic aperture focusing technique, SAFT)을 활용하여 탄소강에서의 결함 신호 해석을 시도하였으며 탄소강 평판내에 가공된 hole을 대상으로 수집된 초음파 신호를 이 기법을 적용하여 처리한 결과 결함으로부터의 신호대 잡음비에 있어서 많은 개선이 이루어진 것으로 판단된다.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2002년도 Proceedings of the International Welding/Joining Conference-Korea
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• pp.688-693
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• 2002

Adhesive bonding is becoming one of the popular joining techniques in metal industries, since it has some advantages over other techniques such as welding and diffusion bonding, e.g., any dissimilar metals are easily adhesive-bonded together. In this study, the experiments were carried out in order to provide the statistical data with strength evaluation methods: tension, shear and four-point bending tests for thermoplastic epoxy resin based adhesive-bonded metal joints. We should certificate on the probability of the adhesive strength that has the tendency of brittle fracture, the adhesive bonding strength between metals with thermoplastic adhesive has the best probability at four-point bending test. The strength testing method that has higher probability is four-point bending test, shear test and tensile test in order.