• Tunnel and Underground Space
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• v.22 no.2
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• pp.77-85
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• 2012

In a material, micro-cracks can be progressively occurred, propagated and finally lead to failure when it is subjected to cyclic or periodic loading less than its ultimate strength. This phenomenon, fatigue, is usually considered in a metal, alloy and structures under repeated loading conditions. In underground structures, a static creep behavior rather than a dynamic fatigue behavior is mostly considered. However, when compressed air is stored in a rock cavern, an inner pressure is periodically changed due to repeated in- and-out process of compressed air. Therefore mechanical properties of surrounding rock mass and an inner lining system under cyclic loading/unloading conditions should be investigated. In this study, considering an underground lined rock cavern for compressed air energy storage (CAES), the mechanical properties of a lining system, that is, concrete lining and plug under periodic loading/unloading conditions were characterized through cyclic bending tests and shear tests. From these tests, the stability of the plug was evaluated and the S-N line of the concrete lining was obtained.

• Journal of Oral Medicine and Pain
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• v.38 no.1
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• pp.69-76
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• 2013

Aim : The purpose of this study was to investigate the hypothesis that treatment with self-checking behavior management program was valuable in the management of temporomandibular disorders compared with a existing method treatment group. Methods : All participants who are diagnosed with temporomandibular disorders were treated with medication and physical therapy. They came into the clinic at intervals of two weeks, three times. The signs and symptoms were assessed investigating Pain NRS(Numerical Rating Scale), MCO(Maximum comfortable opening), Noise NRS, LOM(Limitation of Mouth opening) NRS at every visit. Experimental group received instructions repeatedly by using self evaluation questionnaire. Control group was educated once at the beginning of treatment. The difference Pain NRS, MCO, Noise NRS, LOM NRS between first and second visits, first and third visits were estimated.. Result :Experimental group showed greater improvement on MCO difference after stopping medication(p=0.001). This improvements were prominent in the male(p=0.001) and the first or second decade of the patients(p=0.004). Conclusion : The present study showed that there was better result when educating repeatedly with using self evaluation questionnaire than educating once at the beginning of the treatment.

• Journal of the Korean Institute of Intelligent Systems
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• v.13 no.5
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• pp.512-519
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• 2003

In this paper, we propose a neuro-fuzzy modeling to improve the performance using the hierarchical clustering and Gaussian Mixture Model(GMM). The hierarchical clustering algorithm has a property of producing unique parameters for the given data because it does not use the object function to perform the clustering. After optimizing the obtained parameters using the GMM, we apply them as initial parameters for Adaptive Network-based Fuzzy Inference System. Here, the number of fuzzy rules becomes to the cluster numbers. From this, we can improve the performance index and reduce the number of rules simultaneously. The proposed method is verified by applying to a neuro-fuzzy modeling for Box-Jenkins s gas furnace data and Sugeno's nonlinear system, which yields better results than previous oiles.

• The Journal of the Korea Contents Association
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• v.6 no.1
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• pp.114-125
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• 2006

Since wireless Internet services and small mobile communication devices come into wide use as well as the use of GPS is rapidly growing, researches on moving object, whose location information shifts sequently in accordance with time interval, are being carried out actively. Especially, the researches on vehicle moving object are applied to Advanced traveler information system, vehicle tracking system, and distribution transport system. These systems are very useful in searching previous positions, predicted future positions, the optimum course, and the shortest course of a vehicle by managing historical data of the vehicle movement. In addition, vehicle historical data are used for distribution transport plan and vehicle allocation. Vehicle historical data are stored at regular intervals, which can have a pattern. For example, a vehicle going repeatedly around a specific section follows a route very similar to another. If historical data of the vehicle with a repeated route course are stored at regular intervals, many redundant data occur, which result in much waste of storage. Therefore this thesis suggest a vehicle historical data store scheme for vehicles with a repeated route course using similar trajectory which efficiently store vehicle historical data.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06c
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• pp.416-419
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• 2008

모바일 상의 단문메시지 서비스는 등장한 이례 꾸준히 사용량이 증가하는 추세이며, 현재 세계적으로 가장 많이 사용되는 모바일 서비스이다. 모바일 기기에서 단문 메시지 작성의 불편함을 개선하기 위한 기술로 하드웨어적인 입력 방법 개선과 소프트웨어적인 입력보조 기능이 꾸준히 개발되었다. 소프트웨어적인 방법은 범용성이 넓고 적용이 쉽다는 장점이 있지만 제한된 자원에서 구현상의 어려움이 있어 연구가 미비한 분야이다. 본 논문은 소프트웨어적으로 단문 메시지의 작성을 보조하는 방법을 제시한다. 일상 생활의 반복성에 초점을 맞추어 반복 작성될 메시지에 대해 기존의 메시지를 제시해 자동적으로 응답하도록 하는 방법을 제안한다. 자동적으로 응답 메시지를 선택하기 위한 비교사 학습과 추론 기술로 "메시지 네트워크"를 제안하고, 실험을 통해 고안한 방법의 가능성을 보였다. 실험 결과로부터 반복적인 메시지의 작성에 제시한 방법이 유용함을 알 수 있었다.

• Journal of Convergence for Information Technology
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• v.9 no.11
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• pp.241-246
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• 2019

The purpose of this study was to examine the effects of repetitive oral health education on oral health knowledge, attitudes and behaviors of elementary school students. A final analysis of 111 untested individuals was made. The oral health knowledge and oral health behavior scores according to the presence or absence of oral health education showed a higher level than the school that did not perform oral health education for 3 years (p <0.01). Repeated and continuous oral health education of elementary school students has a great influence on oral health knowledge and behavioral change, so if the dental hygienists can stay and manage oral health care, the effect will be increased.

• Proceedings of the IEEK Conference
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• 2003.07a
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• pp.125-128
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• 2003

CSK(Code Shift Keying) 방식은 전송 용량을 높이고, 잡음에 더욱 견고히 할 수 있다[1,2]. 전통적으로 다중 경로 페이딩, 예측 불가능한 위상과 진폭의 왜곡, 협대역 간섭 신호 및 예측 불가능한 시변 재밍 신호에 의한 간섭 등을 특징으로 하는 채널상에서는 DS-BPSK 방식이 사용되었지만 본 논문에서는 코드열의 반복적 특성을 적용한 CSK/SS(Code Shift Keying/Spread Spectrum) 방식을 제안하고 성능을 분석한다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.153-154
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• 2014

전사 방식은 금속 패턴을 다른 기판에 전사시키는 방법으로, 대면적 디스플레이에 응용하기 위해 나노 사이즈 패턴을 반복적으로 전사하는 새로운 공정을 개발하였다. 나노선 임베드 구조체와 전해 도금 방식을 이용하여 나노선 네트워크 구조체를 반복적으로 이종 기판에 전사시키는데 성공하였으며, 기존의 전사 방식인 건식 방식에 비해 공정 속도를 높이고 전사되는 패턴의 사이즈를 효과적으로 낮추는 것을 확인하였다.

• Proceedings of the Korea Society for Simulation Conference
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• 1998.03a
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• pp.43-49
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• 1998

본 논문에서는 이산사건 시스템의 무시간 DEVS/DEVS 명세에 대한 계층적인 설계/검증 방법을 제안하고자 한다. 제안된 방법의 가장 큰 장점은 DEVS 상위모델과 DEVS 하위 모델간의 반복적인 설계/검증 시 계층적 인 방식을 채택하여 검증 시 일반적으로 문제가 되는 상태폭발 문제를 크게 완화시켰다는 점이다. 간단한 예제를 통하여 제안된 방법론을 자세히 보여주고자 한다.

• Journal of the Korean Statistical Society
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• v.4 no.1
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• pp.57-66
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• 1975

본논문은 단일방정식 추정에 있어서 사전적으로 주어진 모수에 대한 제약을 추정전의 정보로써 피설명변수(explained variable)에 적용하여 회귀하였을 때 추정량이 어떻게 바뀌게 되는가 하는 것을 고찰하고 이를 발전시켜서 반복적인 계산방법을 적용하는 특정의 추정기법에 대하여 시론적으로 접근하는 데에 목적이 있다.