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이영규,양성훈,이승우,이창복,김영범,최성수,Lee, Young-Kyu,Yang, Sung-Hoon,Lee, Seong-Woo,Lee, Chang-Bok,Kim, Young-Beom,Choe, Seong-Su 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.3A
클락 동기는 실내 측위를 위한 실내 동기망을 구축하는데 있어서 가장 기본적으로 고려해야할 요소 중 하나이다. 본 논문에서는 하드웨어의 복잡성 및 동기에 필요한 데이터 오버헤드를 줄이기 위해 타임스탬프를 사용하지 않고 클락을 동기 시키기 위한 새로운 알고리즘에 대해서 논한다. 또한 동기 성능에 큰 영향을 미치는 주파수 드리프트를 보상해 주기 위한 알고리즘에 대해서도 기술한다. 제안한 동기 알고리즘을 사용한 동기 성능에 대한 평가는 모의실험을 통한 MTIE(Maximum Time Interval Error) 값을 고찰함으로써 이루어졌다. 모의실험에 있어서 실제적인 오실레이터에 대한 주파수 드리프트 값을 사용하였다. 모의실험 결과 1 초의 동기 간격에 1 ns 분해능을 갖고 주 클락과 종속 클락에 TCXO를 사용하면 10 ns 이하의 동기가 가능함을 고찰하였다. Clock Synchronization is one of the most basic factors to be considered when we implement an indoor synchronization network for indoor positioning. In this paper, we present a new synchronization algorithm which does not employ time stamps in order to reduce the hardware complexity and data overhead. In addition to that, we describe an algorithm that is designed to compensate the frequency drift giving an serious impact on the synchronization performance. The performance evaluation of the proposed algorithm is achieved by investigating MTIE (Maximum Time Interval Error) values through simulations. In the simulations, the frequency drift values of the practical oscillators are used. From the simulation results, it is investigated that we can achieve the synchronization performance under 10 ns when we use 1 second synchronization interval with 1 ns resolution and TCXOs (Tmperature Compensated Cristal Oscillators) both in the master clock and the slave clock.
이영규,이재수,이승수,김학선,Lee. Young-Kyu,Lee. Jae-Soo,Lee. Sung-Su,Kim. Hak-Sun 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
Data for occurrence of hail over Korean Peninsula for the period 1961-2005 are obtained from the Korea Meteorological Administration (KMA). According to the average occurrences during each season in Korea Peninsular, hail days are almost distributed uniformly in the spring, fall and winter, except the summer and have averages of 5 days for each season. Analysis of regional occurrence of hail shows that inland of Korea Peninsular is vulnerable to hail in the spring and summer and the islands of Ullung, Baegryeong and Cheju and the coastal regions vulnerable in the fall and winter. It can be postulated that these seasonal patterns of hail is affected by the Monsoon effect.
기구조작후 치근표면의 조도에 관한 연구; 3차원 측정기틀 이용한 in vitro 연구
이영규,Lee, Young-Kyoo 대한치주과학회 1998 Journal of Periodontal & Implant Science Vol.28 No.4
A primary goal of periodontal therapy is the creation of root surfaces that are free of plaque and calculus. It is not yet to be determined whether it is desirable to have a smooth root surface after treatment. It is also not clear what degree of roughness result from different instruments. In the present study various instruments for root surface debridement were evaluated. 20 extracted teeth were utilized, and the teeth were treated with one of the following instrument: Gracey curette, Perio Clean, and piezo ultrasonic device(Setlec, P Max) with general scaler tip, curette-like tip, and diamond tip. 3 dimensional planimetric device(Accura) was used to evaluate the average surface roughness. It was demonstrated hand and power-driven instruments did not have a significant difference in roughness of the root surface following instrumentation. And ultrasonic scaler tip tended to make a most smooth surface than other instruments. The possible reasons of the result were discussed.
기구조작후 치근표면의 조도에 관한 연구; 주사전자현미경적 in vivo 및 in vitro 연구
이영규,Lee, Young-Kyoo 대한치주과학회 1998 Journal of Periodontal & Implant Science Vol.28 No.4
Adequate root preparation in the treatment of periodontal disease often involves mechanical instrumentation to remove plaque, calculus perhaps contaminated cementum. Although meticulous scaling and root planing may remove some cementum, the use of aggressive root planing to remove cementum does not appear warranted. So ultrasonic device and rotary instrument appear to be replacing hand instrument. But it is not clear those instruments make smooth root surface as hand instrument. The roghness of the root surface were evaluate with SEM following instrumentation with Gracey curette, Perio Clean and piezo ultrasonic device(Setlec) with various tip. 20 extracted teeth were used in vitro experiment, and 9 teeth of a patient destined for extraction for periodontal reasons were utilized in vivo experiment. It was demonstrated that hand curette created the smoothest surface, while diamond tip tended to roughen the root surface. But the hand curette, Perio Clean, and piezo ultasonic device with scaler tip tend to remove cementum completely. Piezo ultrasonic device with curette-like tip made the desirable smooth surface with partial removal of cementum.
치은열구내 수복과 Dentogingival junction(DGJ);제 2 부:수복물형태와 DGJ
이영규,손성희,Lee, Young-Kyoo,Son, Seong-Heui 대한치주과학회 1999 Journal of Periodontal & Implant Science Vol.29 No.1
All contours of the restoration not directly related to occlusion are related to the gingival tissues only.And proper contour of restoration is essential for the health of the periodontal tissues.But there are so many controversies about the contour of the restoration, and there is no uniform agreement in the literature as to which contour of restoration is best for periodontium. In general, the contour of restoration means the supragingival contour only but in the case of the intracrevicular restorative procedure the subgingival contour of restoration must be considered. Because a portion of the restoration is placed in a gingival sulcus which is extremely vulnerable to periodontal disease. In this article the concepts or theories of the supragingival contour, the subgingival contour, and the emergence profile were discussed.The contour of the restoration and the biotype of the periodontium must be considered in intracrevicular restorative procedure.And sufficient tooth preparation is important factor to develop the proper contour of restoration which is kind to periodontium.