• Proceedings of the Korea Contents Association Conference
• /
• 2007.11a
• /
• pp.440-444
• /
• 2007

This study aimed to develop an evaluation framework for public portal and private portal through user's perception survey. In order to specify the evaluation framework, this study chose yesKISTI and Google as a public portal and a private portal respectively. This study reviewed previous studies to develop indicators to evaluate of public and private portals and developed a framework to provide new services for public portals.

• ETRI Journal
• /
• v.17 no.1
• /
• pp.23-36
• /
• 1995

We present a performance evaluation model of cell reassembly mechanism in an ATM switching system. An ATM switching system may be designed so that communications between processors of its control part can be performed via its switching network rather than a separate inter-processor communications network. In such a system, there should be interface to convert inter-processor communication traffic from message format to cell format and vice versa, that is, mechanisms to perform the segmentation and reassembly sublayer. In this paper, we employ a continuous-time Markov chain for the performance evaluation model of cell reassembly mechanism with individual buffering, judicially defining the states of the mechanism. Performance measures such as message loss probability and average reassembly delay are obtained in closed forms. Some numerical illustrations are given for the performance analysis and dimensioning of the cell reassembly mechanism.

• Proceedings of the Korean Information Science Society Conference
• /
• 2010.06c
• /
• pp.99-104
• /
• 2010

정부는 미래의 성장잠재력을 확충하기 위해 국가경쟁력의 핵심인 과학기술에 대한 재정투자규모를 지속적으로 확대하고 있다. 지속적인 R&D투자 확대의 결과로 국가 중요핵심기술 개발이 활발히 이루어지고 있어, 이에 대한 보안관리 또한 중요시 부각되어 금년부터 국가과학기술위원회는 조사 분석 시 보안과제 현황을 조사하는 등의 노력을 기울이고 있다. 그러나, 보안과제의 경우 엄격한 보안대책 요구등의 행정부담 증가의 이유로 인하여 활성화되지 못하고 있는 실정이다. 이에 본 논문에서는 '09년도 보안과제에 대한 현황분석 및 연구 애로사항을 조사하고, 보안과제에 대한 일선 연구자들의 적극적인 참여를 유도하기 위한 핵심 지원방안을 AHP(Analytic Hierarchy Process) 기법을 통하여 설계하여 보안과제 활성화를 위한 주요 의사결정의 도구로 활용한다.

• Journal of Technologic Dentistry
• /
• v.31 no.4
• /
• pp.45-52
• /
• 2009

This study is analyzed to conduct better on-site practices with recognizing importance of the clinical practice of Dept. of dental technology and use it as a basic material in the clinical practice. Target people who are students studying dental technology in D college in Daegu were questioned by survey. Study results below 1. Average score of the survey about satisfaction of the operating method of clinical practice shows 3.26. In detail elements, 'credit assignment(10 credits)' is 3.65 as the highest score, 'execution period(vacation)' is 3.50, 'choice of the clinical practice organization' is 3.25, 'measures after practice' is 2.98 and 'pre-education' is 2.98 as the lowest score. 2. Through the real clinical practice, 'experience of new equipments and technology' is 3.64 as the highest score, 'choice of lecturer' is 3.61, 'guidance way' is 3.49, 'contents properness' is 3.44, 'environment of practice organization' is 3.36, 'evaluation way' is 3.35 and 'practical use of the evaluation material' is 3.18 as the lowest score. 3. The average score of survey about satisfaction after clinical practice of the participated students is 3.46 that is higher than both 'satisfaction about operating method(3.26)' about clinical practice of college and 'satisfaction about organization(3.44)' about environment of dental craft organizations and labs, guidance way of lecturer and evaluation. 4. In the improvement of distribution of the clinical practice evaluation, in the 'practice organization: college' viewpoint, '7:3' is 35.77% as the highest response, '6:4' is 25.20%, '8:2' is 22.76% and '4:6' is 16.26 in regular sequence. 5. In site evaluation reflection of clinical practice, 50% reflection is 32.93% as the highest percentage, 60% reflection is 26.83%, 20% reflection is 20.73% and 80% reflection is 6.10% in regular sequence. In attendance score, it shows percentage of reflecting 50% and 40% is 26.98%, students wanting to reflect 30% is 25.40%, reflecting 10% is 20.63% and no reflecting is 0%. In result of the analyzed data, clinical practice has to be studied more in considering that clinical practice is important point in education of Dept. of Dental Technology and also problems in college and on-site practice need improvements.

• Journal of Science and Technology Studies
• /
• v.15 no.2
• /
• pp.163-189
• /
• 2015

While Science tries to be far from Society, it actually does yearn for the trust from Society, on the other side. Its efforts getting back the trust has been witnessed with its fast evolution, consistent distrust from Society and Scientists' accountability with investment of public fund. Furthermore, many scholars have argued that there is the need to integrate science and society. In this regards, this paper explores how to integrate both spheres by participatory evaluation. To identify how the participatory evaluation works and should be, three main issues are mentioned. One is about evaluation methods; Objective-oriented and Behaviour aspects. Second is about prerequisite factors; sharing scientific language and changed recognition between civil society and scientists. Third is about challenge to be tackled; epistemological gap among evaluators and complex index. Under these issues, this paper sets out that the participatory evaluation should adopt the appropriate evaluation methodology. Last but not least, self-recognition and motivation by evaluators themselves are important factors, along with societal system which can take participatory evaluation.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.67 no.8
• /
• pp.1024-1030
• /
• 2018

Recently, the large scaled energy storage system(ESS) which has various functions such as peak saving, demand management, output stabilization of renewable energy and frequency regulation(FR) is being energetically installed and operated. Especially, as the use case of frequency regulation ESS, the KEPCO has demonstrated the total of 376[MW] ESS since 2014. However, there are no operational experiences and international technical standards on frequency regulation application in ESS. Therefore, this paper propose the evaluation algorithm for power system performance of ESS by considering the frequency characteristics between governor of existing generator and frequency regulation ESS, in order to verify the power system performance of ESS. And also, this paper propose an evaluation modeling for small scaled power system including the existing generator, frequency control ESS and customer loads based on the PSCAD/EMTDC S/W. From the simulation results in 360[MW] model power system, it is confirmed that frequency regulation ESS has better performances than conventional generators.

• Journal of the Korean Society for Library and Information Science
• /
• v.38 no.4
• /
• pp.219-230
• /
• 2004

Digital image technology can be used for the development of new curriculum, course assignment, teaching methods, or the evaluation of library and information science courses. In this way, the teaching course becomes more effective and more interesting. This study has shown that the number of the student registration was increased, the interaction between the instructor and students became more frequent. and the course evaluation by students were very much improved.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2005.05a
• /
• pp.267-270
• /
• 2005

국내에서는 게임용 소프트웨어의 개발을 통한 부가가치의 창출 효과가 높아지면서 많은 IT 업체에서 제품 개발과 동시에 제품에 대한 평가에 관심을 가지게 되었다. 본 연구는 게임 소프트웨어의 품질 평가를 위해서 게임 소프트웨어의 결함을 발견하기 위한 버그 체크리스트를 구성하였다. 이러한 버그 체크리스트 구성을 위해서 게임 소프트웨어 사용자를 중심으로 설문조사를 실시하였으며 이러한 조사결과를 게임 소프트웨어의 품질 평가 메트릭을 개발하는데 적용하여 ISO/IEC 9126 평가 메트릭을 제시하였다.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.20 no.6
• /
• pp.501-510
• /
• 2000

Recently, advanced signal analysis which is called "time-frequency analysis" has been used widely in nondestructive evaluation applications. Wavelet transform(WT) and Wigner Distribution are the most advanced techniques for processing signals with time-varying spectra. Wavelet analysis method is an attractive technique for evaluation of material characterization nondestructively. Wavelet transform is applied to the time-frequency analysis of ultrasonic echo waveform obtained by an ultrasonic pulse-echo technique. In this study, the feasibility of noise suppression of ultrasonic flaw signal and frequency-dependent ultrasonic group velocity and attenuation coefficient using wavelet analysis of ultrasonic echo waveform have been verified experimentally. The Gabor function is adopted the analyzing wavelet. The wavelet analysis shows that the variations of ultrasonic group velocity and attenuation coefficient due to the change of material characterization can be evaluated at each frequency. Furthermore, to assure the enhancement of detectability and naw sizing performance, both computer simulated results and experimental measurements using wavelet signal processing are used to demonstrate the effectiveness of the noise suppression of ultrasonic flaw signal obtained from austenitic stainless steel weld including EDM notch.

• Journal of the Earthquake Engineering Society of Korea
• /
• v.20 no.4
• /
• pp.201-209
• /
• 2016

Damages of large embankment dams by recent strong earthquakes in the world highlight the importance of seismic security of dams. Some of recent dam construction projects for water storage and hydropower are located in highly seismic zone, hence the seismic performance evaluation is an important issue. While state-of-the-art numerical analysis technology is generally utilized in practice for seismic performance evaluation of large dams, physical modeling is also carried out where new construction technology is involved or numerical analysis technology cannot simulate the behavior appropriately. Geotechnical centrifuge modeling is widely adopted in earthquake engineering to simulate the seismic behavior of large earth structures, but sometimes it can't be applied for large embankment dams due to various limitations. This study proposes a dynamic centrifuge testing method for large embankment dams and evaluated its applicability. Scaling relations for a case which model scale and g-level are different could be derived considering the stress conditions and predominant period of the structure, which is equivalent to previously suggested scaling relations. The scaling principles and testing method could be verified by modified modeling of models using a model at different acceleration levels. Finally, its applicability was examined by centrifuge tests for an embankment dam in Korea.