• Journal of Technologic Dentistry
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• v.41 no.2
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• pp.113-122
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• 2019

Purpose: This study analyzed the difference in participation motive, expectation for educational institution and educational satisfaction depending on participation level of students of advanced course for bachelor of dental technology. Methods: 81 students of advanced course for bachelor of dental technology from four university were selected by convenience sampling method. To analyzed influence of participation level depending on participation motive, expectation for educational institution and educational satisfaction, regression analysis was carried out. Results: The participation level of the students was found to be influenced by the educational satisfaction, participation motive and expectation for educational institution. Conclusion: Based on the results, it is important to understand the participation motive of the students and to offer satisfaction environment and administrative support for enhancing the expectation for education for educational institution.

• Nuclear Engineering and Technology
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• v.22 no.1
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• pp.36-44
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• 1990

A safety assessment computer code CALM (Computer program of Assessment for LILW Management) is developed for the theoretical prediction of long-term safety of low-and intermediate-level radioactive waste disposal. CALM is composed of three submodels, which are the resaturation model, the geosphere migration model, and the radiation dose model. For the verification of its usefulness, the safety assessment of an assumed waste repository is performed. The results show that the computer code, CALM developed through this study can be a useful tool for the safety assessment of low- and intermediate-level radioactive waste repository.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.160-161
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• 2010

본 논문에서 대전력, 고전압에 적합한 three-level 의사공진형 PWM 컨버터를 제안한다. 의사공진형으로 동작함으로써 넓은 ZVS 영역을 가지며, 고정 주파수를 사용하므로 자기 소자의 설계가 쉬워지는 장점을 가진다. 그리고, 변압기에 인가되는 전압 파형의 주파수가 스위칭 주파수의 2배가 되므로 변압기의 크기를 줄 일 수 있고, 변압기 2차측에 출력 인덕터가 없는 전압배가기를 적용하여 정류기 양단에 전압리깅이 발생하지 않아 정류단의 전압 스트레스가 감소되는 장점 또한 가진다. 본 논문에서는 제안한 컨버터을 분석하고, 프로토타입을 통해 그 동작을 검증한다.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.1179-1180
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• 2008

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.1183-1184
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• 2008

• JSTS:Journal of Semiconductor Technology and Science
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• v.1 no.4
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• pp.216-231
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• 2001

Several methods for improving device yields and characteristics have been studied by IC manufacturers, as the options for programming components become diversified through the introduction of novel processes. Especially, the sequential repair steps on wafer level and package level are essentially required in DRAMs to improve the yield. Several repair methods for DRAMs are reviewed in this paper. They include the optical methods (laser-fuse, laser-antifuse) and the electrical methods (electrical-fuse, ONO-antifuse). Theses methods can also be categorized into the wafer-level(on wafer) and the package-level(post-package) repair methods. Although the wafer-level laser-fuse repair method is the most widely used up to now, the package-level antifuse repair method is becoming an essential auxiliary technique for its advantage in terms of cost and design efficiency. The advantages of the package-level antifuse method are discussed in this paper with the measured data of manufactured devices. With devices based on several processes, it was verified that the antifuse repair method can improve the net yield by more than 2%~3%. Finally, as an illustration of the usefulness of the package-level antifuse repair method, the repair method was applied to the replica delay circuit of DLL to get the decrease of clock skew from 55ps to 9ps.

• English Language & Literature Teaching
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• v.13 no.2
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• pp.109-127
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• 2007

As an attempt to investigate the use of common verbs by a small group of Korean college students at the advanced level, the present study describes the students' speech production data collected from picture description tasks. The primary focus of the data description was how the students used high-frequency verbs in describing everyday activities. Out of total 442 units, 149 verbs were erroneously used. All erroneous utterances were classified into four categories according to their characteristics. The most prominent error type was overgeneralization due to incomplete knowledge of lexical items. Results showed that verbs used in everyday life were not easy even for the advanced level students. Although in some cases, L1 influence was discerned, the students' problems are more fundamental. In particular, the data revealed lack of knowledge of collocational possibilities and restrictions, and confusion about semantic boundaries between verbs which have similar semantic areas. The findings suggest that teaching at the advanced level should take contrastive approaches intralingually as well as interlingually to the high-frequency verbs.

• Proceedings of the KIEE Conference
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• 1995.07a
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• pp.368-370
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• 1995

A new three-level push-pull type quantum series resonant rectifier for the power factor correction is proposed. The proposed single phase rectifier enables a zero-current switching operation of all the power devices allowing the circuit to operate at high switching frequencies and high power levels. With the proposed control technique, an unity power factor and greatly reduced line current harmonics can be obtained.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1993.06a
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• pp.1054-1057
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• 1993

A direct method of fuzzy inference and a fuzzy algorithm with learning function are applied to the steam generator level control of nuclear power plant. The fuzzy controller by use of direct inference can control the steam generator in the entire range of power level. There is a little long response time of fuzzy direct inference controller at low power level. The rule base of fuzzy controller with learning function is divided into two parts. One part of the rule base is provided to level control of steam generator at low power level (0%∼30% of full power). Response time of steam generator level control at low power level with this rule base is shown generator level control at low power level with this rule base is shown to be shorter than that of fuzzy controller with direct inference.

• Journal of the Korea Institute of Military Science and Technology
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• v.12 no.1
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• pp.60-69
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• 2009

Recently, request far application of advanced commercial technology to the defense acquisition process, to reduce the budget and shorten development time, has been increased. To accomplish these goals, the Advanced Concept Technology Demonstration(ACTD) is used for the defense acquisition process in Korea. And User Utility Assessment is tested to make a decision for transition to acquisition process. But this process does not include measurement of technology maturity and impacts of interface and interaction among the technologies. In this research, we propose the needs of measurement of TRL and IRL and application of SRL to reduce the risk during development phase, to understand the relations of technologies, and to fulfill the requirement far transition of the ACTD project to system development and demonstration process.