• 한국지능시스템학회논문지
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• 제22권1호
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• pp.56-61
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• 2012

본 논문에서는 이중여자 유도발전기 기반 가변속도 풍력발전 시스템의 퍼지 모델링 및 안정도 해석에 관하여 다루고자 한다. 일반적인 풍력발전 시스템은 복잡한 비선형성 기반 동적방정식으로 구성되며, 플랜트를 구성하는 각 파라미터 수치 역시 주변 환경에 의해 변화할 여지가 있다. 풍력발전 시스템의 해석을 위하여 본 논문에서는 비선형성 및 불확실성에 강인한 퍼지 제어 기법을 기반으로 제어이론을 구성하고자 한다. 이중여자 유도발전기 기반 풍력발전 시스템의 퍼지 모델링 및 시스템 안정화를 위한 퍼지 제어기 설계 기법이 제안된다. 해당 제어 기법은 리아푸노프 기반 안정도 해석에 의해 점근 안정도를 보장받게 되며, 가상 시뮬레이션을 통한 시스템 효율성을 입증하게 된다.

• Journal of Oral Medicine and Pain
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• 제19권1호
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• pp.137-149
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• 1994

This study was performed to investigate the relationship between Forward Head Posture(FHP) and Craniomandlbular Disorders(CMDs). Many studies reported that there was some relationship between them, however, there is still controversy. So It Is necessary to observe and compare many more patients with CMDs wirh normal controls. For the study 85 patients with CMDs and 37 dental students were selected as experimentals and controls, respectively. And the experimentals were classified Into two groups, that is, TMJ internal derangement group and muscle disorders group according to clinical diagnosis. For measuring the FHP, CROM(Cervical-Range-of-Notion)was used. This goniometer is composed of three part. First, gravity goniometer for flexion and extension. Second, magnetic compass and yoke for rotational movement. And last, forward head arm and vertebra locator for forward head posture. Next T-Scan, electronic occlusal analyzer, was used for recording of occlusal contact state. Other items such as maximum opening, lateral excursion, Helkimo's anamnestic index, and muscle palpation point from Friction's craniomandibular index were checked clinically by one examiner. The result of this study were as follows : 1. In male, control group showed much more measurement in resting forward head posture than did experimental group. But there were not significant differences between groups in female subject. From this results, the author contended that CROM is new measuring system and differ from other goniometers in some aspect, so that results should be re-evaluated 2. Mean value of maximum mouth opening in nearly all groups were greater than 40mm. and mouth opening had a significant correlation with occlusal force and with anamnestic index both sex. 3. Mean value of palpation point had not any correlationship with forward head posture in both sex, but there was significant difference between upper and lower group by rounded shouldes. 4. In summary, there was no significant relationship between forward head posture and sign and symptom of Craniomandibular Disorders.