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-In recent years, technology for storing a preliminary power or a surplus of photovoltaic energy is required. This technique, as well as store a preliminary energy and improve the reliability of the gird safety. This system can plan a efficient power generation through the flexibility of the power supply from the perspective of not only provider but also user. Accordingly, the realization of the smart grid can be expected. This paper proposes a hybrid PCS using a photovoltaic and a lithium-polymer battery with the characteristics of high density energy. The main energy source of a hybrid PCS is a photovoltaic, grid and the auxiliary energy source is a lithium-polymer battery. The operation of a proposed system in this paper is verified with simulation and experimental results.

이러한 문제점들을 해결하기 위해 Electronic impression device (EID)가 개발되었다. 이것은 지대치를 형성한 후 간단하게 구강 스캐너로 치아를 스캔하고 모니터상으로 실시간 구현되는 3D 모델을 보며 수정작업 및 교합 검토 작업을 마친 후, 인터넷상 으로 전송하여 추후 CAM으로 모델을 제작하는 장비이다. 이 3D-디지털 인상채득법은 인상재로 인한 환자의 불편감이 줄 어들고, 모니터로 지대치를 형성한 것을 즉시 볼 수 있기 때문 에 환자교육용으로 좋으며, 치아형태를 평가하여 삭제량이 적 당한지 바로 확인하는 것에도 도움이 된다. 또한, 환자간 교차 감염 위험의 가능성을 감소시킬 수 있고, 기공실에서 변형되 지 않은 정확한 데이터를 받아볼 수 있으며 그 데이터를 영구 적으로 보관할 수 있다는 장점이 있다. 3 본 증례는 약 8년전 외상으로 인해 변색된 상악중절치 수복 을 주소로 내원한 22세 여자 환자를 3D-디지털 인상채득기기 (iTero TM )를 이용해 인상채득하고 CAD/CAM (Cercon)방식으로 전 부도재관을 제작하여 이를 기존 방식 보철물과 비교한 증례이 다. 이번 증례를 통해 디지털 인상채득법을 이용한 환자의 치 료 과정 및 기공 과정에 대해 자세히 소개하고, 기존 아날로그 시스템과 현재 사용되고 있는 디지털 시스템 인상채득법의 정 확도를 비교해 보고자 하였다.The digital impression technique has been developed for more precise restorations and convenient procedures in prosthodontic treatment compared to the conventional impression technique. Along with the utilization of CAD/CAM, the introduction of digital impression technique actualizes the digitalization of dental treatments. This case is to compare two different prostheses introducing each procedure in detail; one from CAD/CAM after taking digital impression and the other from the conventional technique. A 22year-old female visited the clinic with the chief complaint of correction of discoloration and shape on maxillary right central incisor. Due to the trauma 8 years ago, the tooth was endodontically treated with post and resin core. The treatment was planned and the procedures were conducted under the patient's consent to treat the tooth with all ceramic crowns in two different ways for comparison. In conclusion, both prostheses presented clinically acceptable results with comparing the internal fitness of two all ceramic crowns. The prosthesis from digital impression, however, showed more errors in respect of internal fitness. (J Korean Acad Prosthodont 2011;49:263-9)

The purpose of this study is to investigate the improvement measure of dental technicians practical examination system. Methods: The subjects in this study were 290 dental technicians who were self-written questionnaire. The results were analyzed by SPSS 16.0. The collected data was analyzed by frequency and chi-square test. Results: Dental technician practical exam feasibility of survey were largely negative views. Articulators work required in practical exam as a tool used (28.7%), electric wax carver (19.5%), heating clear (17.8%), handpiece (16.2%) had a response. Dental Technician positions in accordance with practical exam in comparison to satisfaction, the professor is satisfied, but the clinical dental technicians were generally dissatisfied (p<0.05). Conclusion: Based on the results of this study, Current is necessary to analyze the practical test. It also should be compared with foreign institutions. Long-term and short-term improvement examination system that can be applied to the improvement of the dental technician to draw practical test it is necessary to improve the system.

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