• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2007.11a
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• pp.165-169
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• 2007

Qualification test range for Lox/Kerosene gas generator cyle liquid rocket engine was determined by considering engine dispersion and flight inlet conditions. With various pump characteristics, the operation range of components and system was investigated through dispersion analysis. The variation of engine performance shows opposite trends in calibration and dispersion.

• Journal of Digital Convergence
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• v.14 no.9
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• pp.325-329
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• 2016

Facial authentication has the limelight because it has less resistance and it is hard to falsify among various biometric identification. The algorithm of facial authentication can bring about huge difference in accuracy and speed by the algorithm construction. Along with face-extracted data by tracing and extracting pupil, the thesis studied algorithm which extracts data to improve error rate and to accurately authenticate face. It detects face by cascade, selects as significant area, divides the facial area into 4 equal parts to save the coordinate of object. Also, to detect pupil from the eye, the binarization is conducted and it detects pupil by Hough conversion. The core coordinate of detected pupil is saved and calculated to conduct facial authentication through data matching. The thesis studied optimized facial authentication algorithm which accurately calculates facial data with pupil trace.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.12 no.2
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• pp.123-133
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• 2002

In Network Environment, Kerberos certification mechanism to require Kerberos server in other area unconditionally belief. Also, Kerberos server in cooperation area must be share server of other area and secret key. To solve these two problems, this paper proposed safe security mechanism of doing to ably IETF CAT's PKINIT/PKCROSS a1gorithm with Public Key Infrastructure and use Directory System and service between realms do trust and prove each Kerberos trust center base. Also, Although Kerberos server of each area must be foreknowing each server's secret key and public key, Obtain through Trust center and acquire each area's public key and common symmetric key, Application server excluded process that must register key in Key Distribution Center.

• Journal of KIISE:Information Networking
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• v.28 no.1
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• pp.136-142
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• 2001

본논문에서는 X.509와 DNS를 연관하여 새로운 Kerberos 인증 메카니즘을 제안한다. Ker-beros에서는 영역간의 서비스에 대하여 언급을 하지 않았기 때문에 영역간 인증은 X.509와 DNS(Domain Name System)를 사용하여 키관리 방식을 갖고 있는데 Kerberos는 공통키에 기반을 두고 있는 반면에 X.509는 공개키 방식에 기반을 두고 있다. 따라서 본 논문에서는 이들을 상호 연동시키기 위해 연결 세션은 DS를 이용하였고 실제적인 인증을 위해서는 Kerberos를 적용하였다. 새로운 프로토콜은 통신복잡도와 관점에서 고찰하면 IETF CAT 작업반에서 제안한 인증 메커니즘보다 개선되었다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.4C
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• pp.290-296
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• 2012

In this paper, we propose a practical authentication system based on Wireless Body Area Networks(WBAN) for U-healthcare medical information environments. The proposed authentication system is based on symmetric cryptosystem such as AES and is designed to not only provide security such as data secrecy, data authentication, data integrity, but also prevent replay attack by adopting timestamp technique and perform secure authentication between sensor node, master node, base-station, and medical server.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.211-214
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• 2010

본 연구에서는 소프트웨어 프로세스 개선모델인 CMMI에 기반한 소프트웨어 프로세스 품질인증 모델을 적용하여 중소기업 SW개발 프로세스의 개선성과를 보인다. 프로세스 개선영역은 프로젝트 관리, 개발, 지원 영역이며 소프트웨어 프로세스 품질인증 모델 대비 프로세스 이행수준 및 개선영역을 식별하고, SW개발 프로세스를 분석하였다. 분석결과를 토대로 SW개발 프로세스를 개선하여 프로세스 체계 수립, 요구사항과 산출물간의 추적성 관리체계 정립, 형상변경 통제체계 성립 등의 성과를 보인다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.733-738
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• 2004

In a distributed network system, Kerberos certification mechanism is operated by a user in local area on the premise reliability of Kerberos server in another area. But it has a demerit. If security information of certification server between Kerberos servers is released, Kerberos server can not guarantee the reliability. To solve this problem, the proposed mechanism prevents password speculating attack by increasing the random of password certifier through use of distributed password in stead of certification center and certification which was presented by existing Kerberos mechanism. Besides, it used password based certification method which uses secret distributed technique

• Journal of radiological science and technology
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• v.36 no.4
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• pp.281-290
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• 2013

This study aimed to assess whether the changes in compliance rates of evaluation criteria after healthcare accreditation among radiologic technologists working at four university hospitals which had acquired healthcare accreditation in Daejeon metropolitan area. In this study, the evaluation criteria of healthcare accreditation were reclassified and reevaluated to three areas which include patient safety, staff safety, and environmental safety. Each area has eight, three, and five questions, respectively. Each compliance rate was quantitatively measured on a scale of 0 to 10 before and after in this study. The result shows that the overall compliance rates were decreased on all areas compared to the time healthcare accreditation was obtained. The compliance rate of hand hygiene was drastically reduced. To maintain the compliance rates, not only individuals but healthcare organizations should simultaneously endeavor. In particular, healthcare organizations should make an effort to provide continuous education opportunity to their workers and supervise the compliance regularly.

• Journal of the Korean Society of Food Science and Nutrition
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• v.44 no.10
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• pp.1558-1566
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• 2015

The purpose of this study was to examine dietitians' perception of importance about standards of foodservice management associated with long-term care hospital accreditation. This study was carried out through a postal survey consisting of 500 questionnaires, and 157 returned questionnaires were used in the statistical analysis. The results were summarized as follows. Average scores of perception of importance were 4.54/5 points in foodservice production management domain, 4.56/5 points in foodservice facilities management domain, and 4.70/5 points in foodservice sanitation domain. The average scores of importance of long-term care hospitals without accreditation were significantly (P<0.05) lower than those of hospitals with accreditation in items of 'establishment of ventilation equipment in kitchen', 'establishment of hand-washstand in toilet (warm-water, soap)', 'setup of sterilizing foothold in entrance of kitchen and toilet', 'division and use of knife, chopping board, gloves, and utensils before and after cook', 'establishment of cleaning plan and cyclic practice', and 'recording of receiving diary'. Results indicate that there is a need to supplement a casebook of regulations by suggesting detailed and critical limits in the case of below average points of importance. A manual, including HACCP standards for foodservice management of long-term care hospitals, is needed, along with education and webpage for comparing notes on accreditation of long-term care hospitals.

• Journal of Digital Convergence
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• v.15 no.3
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• pp.55-64
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• 2017

This study identified the important categories and items about evaluation criteria of e-learning quality assurance by comparing evaluation criteria between Korea and France case. For deriving the conclusion, this research analyzed the Korea quality assurance case which is consist of success or failure for evaluation of quality assurance, and built the generic quality model of e-learning evaluation criteria. A generic model about evaluation criteria, categories, and item of e-learning quality assurance, which should be reflected on French quality criteria, were developed based on statistical approach. This research suggests a evaluation criteria which can be applied to African and Asian countries, that are related to AUF, as well as Korea. The result of this study can be applied to all organizations around the world which prepare for e-learning quality assurance, and at the same time it will be a valuable resource for companies or institutions which want to be evaluated e-learning quality assurance.