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정상교합자와 골격성 Ⅲ급 부정교합자의 경추골성숙도에 관한 연구
양규호,최남기,최봉선,이영준,류선열,김선미 大韓小兒齒科學會 2004 大韓小兒齒科學會誌 Vol.31 No.1
정상교합자와 골격성 Ⅲ급 부정교합자간의 성장 정도에 차이가 있는지를 평가하기 위해 8-12세 여자를 대상으로 하여 진단 석고 모형과 측모두부방사선사진을 기준으로 정상교합자 172명 , 골격성 Ⅲ급 부정교합자 191명 총 363명을 분류하여 연구를 시행하였다. 경추의 하연의 만곡도와 수직·수평 길이의 비를 측정해서 연령이 증가함에 따른 변화를 분석하여 다음과 같은 결론을 얻었다. 1. 연령이 증가함에 따라 제2~6경추의 하연의 만곡도는 정상교합자와 골격성 Ⅲ급 부정교합자 모두에서 일정하게 증가하였다. 2. 연령이 증가함에 따라 제3~6경추의 수직·수평 길이의 비도 정상교합자와 골격성 Ⅲ급 부정교합자 모두에서 일정하게 증가하였다. 3. 제2~6경추의 하연의 만곡도와 제3~6경추의 수직·수평 길이의 비에서 정상교합자와 골격성 Ⅲ급 부정교합자간의 경추골성숙도 차이를 조사한 결과 통계적으로 유의한 차이를 보이지 않았다. 이상의 결과에서 정상교합자와 골격성 Ⅲ급 부정교합자간의 경추골성숙도를 비교했을 때 유의한 차이를 보이지 않았으므로 성장에 차이가 없음을 시사하였다. This study was to evaluate and compare differences of the cervical vertebral skeletal maturity of normal occlusion and skeletal Class Ⅲ malocclusion. Normal occlusion (172 girls) and skeletal Class Ⅲ malocclusion(191 girls) were classified according to diagnosis stone model and lateral cephalogram of Korean girls aging from 8 to 12 years. The concavity of inferior border, vertico-horizontal ratio of cervical vertebrae were observed and measured according to age. Differences of the cervical vertebral skeletal maturity were evaluated. The results were as follows : 1. The concavity of inferior border of the 2nd to 6th vertebrae of normal occlusion and skeletal Class Ⅲ had uniformly increased with age. 2. The vertico-horizontal ratio of the 3rd to 6th vertebrae of girls with normal occlusion and skeletal Class Ⅲ had uniformly increased with age. 3. There was no significant difference in cervical vertebral skeletal maturity between normal occlusion and skeletal Class Ⅲ malocclusion in the concavity of inferior border of the 2nd to 6th vertebrae and in the vertico-horizontal ratio of the 3rd to 6th vertebrae. The results in the study indicate that there is no significant difference of cervical vertebral skeletal maturity between girls with normal occlusion and skeletal Class Ⅲ malocclusion.
A Study on the Performance of a 5 kW Scale VAWT with Omni-Directional Guide Vanes
Ryu, In-Ho,Hoang, Anh Dung,Kim, Jun-Ho,Lee, Ki-Seon,Yang, Chang-Jo Korean Society for Fluid machinery 2016 한국유체기계학회 논문집 Vol.19 No.4
Vertical axis wind turbine, despite of its limit in power efficiency, the simplicity in structure and maintenance is a competitive factor that keeps this type of turbine in the game until nowadays. Continuous solutions have been given to handle its major weakness and the use of omni-directional guide vane is an considerable one. In this paper, a 5kkW scale Savonius-based wind turbine enhanced with such guide vane system was design and studied. Together with reasonable blade design, the wind turbine shows promising performance compared with basic design while maintaining its original advantages.
Study of the MIDS Gateway Design for the Impermissible Signal to Incoming Prevention
Seon-Keun Lee,Je-Ho Song,Jun-Ho Bang,Jae-young Yu,Tae-hyung Kim,In-Ho Ryu,Woo-Choun Lee 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
As existing methods to detect unknown(impermissible) signals operate independently against the virus and internal/external attacks, system efficiency is very low and high maintenance costs are required. Therefore, in this paper, Merged IDS(MIDS) gateway system is proposed. It is possible to detect impermissible signal from inside of system for various viruses and internal/external attacks. By managing impermissible signals which exist independently, on a single system, MIDS makes a efficient and cost-effective system.
류호선(Ryu Ho-Seon),임익헌(Lim Ick-Hun) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
SFC(Static Frequence Converter)system has come to be used as start-up drive system for large synchronous machine in many industry applications. Many papers have been presented the control algorithm for pumped storage power generation using SFC system but they did not included about the detailed start-up algorithm of gas turbine using SFC system. This paper presents the important field weakening control algorithm of a large synchronous machine using SFC system and the results of experiment show that the proposed algorithm is proper and effective about this.
SCPT(Saturable Current Potential Transformer)여자시스템에 관한 연구
류호선(Ho-Seon Ryu),신만수(Mahn-Su Shin),이주현(Joo-Hyun Lee),임익헌(Ick-Hun Lim),송성일(Seong-il Song) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
Many power plants m the thermal and hydraulic utilities, the pulp and the paper industry are faced with high maintenance and down time due to the aged excitation system<br/> For the life extension of the aged power plants, the static excitation system with SCPT type had been developed by KEPRI(Korea Electric Power Research Institute) This paper win discuss the design conception and the application results of system which includes the phase controlled rectifiers of the shunt type, SCPT and redundant analog controller
류호선(Ryu Ho-Seon),임익헌(Lim Ick-Hun) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
KEPRI developed digital excitation system for San-Cheong pumped storage power plant. This is the very complicated system because of operation connected with SFC(Static Frequency Converter). Many operation modes(stating, regeneration, back to back, line charging, gird connection mode etc) during the commissioning were successfully tested at san-Cheong #2.
가새재 및 부재 연결 조건을 고려한 3차원 가설 동바리 구조물의 신뢰성 해석
류선호 ( Seon-ho Ryu ),옥승용 ( Seung-yong Ok ),김승민 ( Seung-min Kim ) 한국안전학회(구 한국산업안전학회) 2019 한국안전학회지 Vol.34 No.1
This study performs reliability analysis of three-dimensional temporary shoring structures with three different models. The first model represents a field model which does not have diagonal bracing members. The installation of bracing members is often neglected in the field for convenience. The second model corresponds to a design model which has the bracing members with the hinge connection of horizontal and bracing members at joints. The third model is similar to the second model but the hinge connection is replaced with partial rotational stiffness. The reliability analysis results revealed that the vertical members of the three models are safe enough in terms of axial force, but the vertical and horizontal members exhibit a big difference among the three models in terms of combination stress of axial force and bi-axial bending moments. The field model showed significant increase in failure probability for the horizontal member, and thus the results demonstrate that the bracing member should be installed necessarily for the safety of the temporary shoring structures.
류호선(Ho-Seon Ryu),임익헌(Ick-Hun Lim) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
본 논문은 이차공기송풍기를 가변 회전수 제어하여 소내 소비 전력을 절감하고, 전동기의 직입기동에 의한 스트레스를 줄이기 위하여 실증 적용된 발전소 이차 공기 송풍기 구동용 H-브릿지 멀티레벨 인버터에 관한 것이다. H-브릿지 멀티레벨 인버터는 독립적으로 절연된 직류 부를 갖는 저압의 단상 인버터(셀 인버터)를 다수 직렬 접속하여 고압 3상 전압을 출력하는 Cascaded H-브릿지 전압형 인버터이다. 주요내용은 국산 인버터 발전소 현장적용 기술을 바탕으로 대형 인버터 현장 실측 내용과 적용시의 문제점들을 다루어 발전소에 확대 적용에 도움을 주고자 한다.
류호선(Ho-Seon Ryu),임익헌(Ik-Hun Lim),이주현(Joo-hyun Lee),강윤종(Youn-jong Kang),김장목(Jang-mok Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
대용량 동기 발전 전동기 운전의 기동용 시스템으로 주로 사이리스터를 이용한 정지형 주파수 변환(SFC : Static Frequency Converter) 시스템이 사용되고 있다. 본 논문에서는 SFC시스템의 기동부터 회생까지 파형을 5KVA급 동기 전용 발전기 모의실험을 통하여 제시하고 330MVA급 양수 발전소의 실측 파형을 분석하여 알고리즘을 도출하였으며 또한 시뮬레이터 파형과 실제 파형을 비교해 함으로써 양수발전소의 제어 시스템의 운전특성을 유추 및 분석하였다.