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파력발전기 지지구조의 강도평가 및 형상 Guideline 제시
정한별(Han Byeol Jeong),김대현(Dae Hyeon Kim),오근원(Keun Won Oh),임재한(Jae Han Lim),유병석(Byeong Seok Yu),홍기용(Key Yong Hong),이강수(Kang Su Lee) 한국해양환경·에너지학회 2016 한국해양환경·에너지학회 학술대회논문집 Vol.2016 No.5
부유식 파력-해상풍력 연계형 발전시스템 중 파력발전기 지지구조물은 설계수명동안 파랑에 의한 압축력, 굽힘하중, 전단력 등의 하중을 받는다. 이는 파력발전기 지지구조물의 최종강도에 영향을 미치게 되며, 한 장소에 장기간 머무는 구조물의 특성상 최종강도를 만족하는 구조물을 설계하는 것은 매우 중요한 요소이다. 본 연구에서는 다양한 형상의 파력발전기 지지구조물에 대해 검토하였으며, 정적해석을 통하여 강도평가를 수행하였다. 더 나아가 파력발전기의 유지보수가 용이한 형상의 파력발전기 지지구조물에 대한 guideline을 제시하고자 한다. Wave Energy Converter(WEC) guide frame, among the wave-offshore wind hybrid power generation system, is pressured by compression, bending and shear load from the waves during its design life. These factors affect the ultimate strength of the WEC guide frame; and considering the nature of a structure which stays in one place for a long time, it is highly significant to design such structure satisfying the characteristics of ultimate strength. This study examined the WEC guide frame in various forms and strength assessment was conducted through linear static analysis. Furthermore, this study proposes a guideline for the WEC guide frame in a form where maintenance work is facile.
여상근(Sang Geun Yeo),정한별(Han Byeol Jeong),대창민(Chang Min Dae),민관홍(Kwan Hong Min),김성룡(Seong Ryong Kim) 대한CT영상기술학회 2008 대한CT영상기술학회지 Vol.10 No.1
Purpose To considerate the efficiency of Automatic Exposure Controller(AEC) and Beam Collimation with the value of Effective Dose obtained with the alteration of Automatic Exposure Controller(AEC) and Beam Collimation. Materials and methods 50 out-patients (Male:36, Female:14, mean age:45 years) underwent Low Dose CT Colonography with 16 MDCT from 1st June 2007 to 31th July 2007 were selected. The Effective Dose was produced with the alteration of DoseRight Automatic Current Selector(ACS) & DoseRight D-Dose modulation(D-DOM), Beam Collimation in same patients. Results On the assumption that Effective Dose without AEC is 100%, 8% was decreased with only ACS, 9% was declined with D-DOM, and 16% was decreased with using ACS & D-DOM. On the same condition, 8% was decreased with the Beam Colliniation increased double. Conclusion 8%~16% of Effective Dose was decreased with AEC Program(ACS, D-DOM) and Beam Collimation. Although 30%-40% of decrease effectiveness was not obtained like the previous papers about dose, the use of Automatic Exposure Controller and Beam Collimation decrease effective dose. The use of AEC and Beam Collimation maintain the high quality of images and extend the tube life time of CT modality.
Cam Type Femoro Acetabular Impingement Syndrome 진단에 이용되는 Alpha Angle 측정에 있어 Dunn View의 유용성에 관한 고찰
김현영(Hyun‐,Young Kim),김상현(Sang‐,Hyeon Kim),정한별(Han‐,Byeol Jeong),권순안(Soon-An kwon),민관홍(Gwan‐,Hong Min) 대한영상의학기술학회 2012 대한영상의학기술학회 논문지 Vol.2012 No.-
적: Cam type Femoro Acetabular Impingement syndrome (FAI) 진단에 있어서 α각 (alpha angle)은 중요한 요소 중 하나이다. 이에 본 논문에서는 Dunn view (45˚,90˚)가 α각 측정에서 있어서 얼마나 유용한지를 Hip MRA와 AP view, Frog leg view, Trans Lateral view와의 비교 분석을 통해서 알아보고자 하였다. 대상 및 방법: 성인 남녀 66명을 대상으로 하였고 장비는 DR (digital diagnost TH, Philips, Netherland), MRI (Achieva 3.0T scanner, Philips, Netherlands)로 검사 하였고, α각 측정은 영상의학과 전문의 1명과 숙련된 방사선사 3명이 각각 측정 하였다. Hip MRA 에서 측정된 값을 Gold Standard로 하였고 Dunn 45˚ view, Dunn 90˚ view, AP view, Frog leg view와 Trans Lateral view의 측정 값 들을 각 각 정규성 검정을 통해 대응검정 T분석과 pearson 상관계수로 비교 분석 하였다. 결과: SPSS 통계 프로그램을 통해 분석하였으며 각각 측정값의 평균과 표준 편차는 MRA 47.3120˚±6.5480, AP view 63.4644˚±15.4772, Frog leg view 56.5708˚±9.9862, Trans Lateral view 49.0558˚±5.4949, Dunn 45˚ view 54.9586˚±8.4270, Dunn 90˚ view 47.8489˚±6.5138로 측정되었다. MRA와 Dunn 90˚ view의 평균차이는 0.3505, MRA와 Dunn 45˚ view는 0.9367, MRA와 Trans Lateral view는 0.7303, MRA와 Frog leg view는 1.3372, MRA와 AP view는 2.1088 이었다. MRA와 Dunn 90˚ view 는 p>0.05로 통계적으로 유의한 차이가 없었으며, MRA와 Dunn 45˚ view, Trans Lateral view, Frog leg view, AP view는 p<0.05로 통계적으로 유의한 차이가 있었다.결론: Dunn 90˚ view는 α각 측정이 비교적 정확하고 환자에게 시간, 비용 절감이 가능하며 조영제를 사용하지 않는 비침습적 검사라는 장점을 가진다. 그러나 통증이 심할 경우 Dunn 45˚, 90˚의 정확한 검사자세를 취할 수 없다는 점과 Dunn 45˚, 90˚ view의 검증된 device 및 accessory가 제작 되지 않아 검사자마다 flexion 및 abduction의 각도가 상이할 수 있다는 한계점이 있었다. 그러나 앞선 MRA와의 비교 결과에서도 알 수 있듯이 Dunn 90˚ view는 α각을 측정 하는데 매우 유용한 검사법이며 MRA 없이도 cam type FAI를 진단하는데 도움이 될 수 있다. Purpose: In the diagnosis of cam‐type FAI (Femoro Acetabular Impingement) syndrome, α angle is one of important factors. This study purposed to test the usefulness of Dunn view (45˚,90˚) in measuring α angle through comparative analysis of hip MRA and simple X‐ray tests AP view, frog leg view, and trans‐lateral view. Materials and methods: The subjects of this study were 66 adult men and women, and test was conducted with DR (digital diagnost TH, Philips, Netherlands) and MRI (Achieva 3.0T scanner, Philips, Netherlands). In addition, α angle was measured by a radiologist and three experienced radiological technologists. The value measured in hip MRA was used as the Gold Standard, and values measured from Dunn 45˚ view, Dunn 90˚ view, AP view, frog leg view and trans‐lateral view were analyzed comparatively by paired t‐test and Pearson’s correlation through normality test. Results: Data were analyzed through SPSS, and the mean and standard deviation of measurements were MRA 47.3120˚±6.5480, AP view 63.4644˚±15.4772, frog leg view 56.5708˚±9.9862, trans‐lateral view 49.0558˚±5.4949, Dunn 45˚ view 54.9586˚ ±8.4270, and Dunn 90˚ view 47.8489˚±6.5138. Difference in mean value was 0.3505 between MRA and Dunn 90˚ view, 0.9367 between MRA and Dunn 45˚ view, 0.7303 between MRA and trans‐lateral view, 1.3372 between MRA and frog leg view, and 2.1088 between MRA and AP view. The difference between MRA and Dunn 90˚ view was not statistically significant (p>0.05), and the differences between MRA and Dunn 45˚ view, tans‐lateral view, frog leg view and AP view were statistically significant (p<0.05). Conclusion: Dunn 90˚ view was relatively accurate in measuring α angle. In addition,it saves time and cost for the patient, and is a non‐invasive examination without using contrast agent. On the other hand, it has the limitations that the patient cannot take the correct examination posture of Dunn 45˚ and 90˚ if pain is severe and that the angles of flexion and abduction may vary among examiners because there are no proven device and accessory for Dunn 45˚ and 90˚ view. As in the results of comparison with MRA shown above, however, Dunn 90˚ view is a very useful method to measure α angle and can be useful to diagnose cam‐type FAI without MRA.
김도훈(Do Hun Kim),곽민성(Min Sung Kwak),김동희(Dong Hui Kim),이상원(Sang Won Lee),이준우(Jun Woo Lee),정한별(Han Byeol Jeong),박세진(Sejin Park) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
Recently, the number of people raising ornamental fish has been increasing, but in general families, it is difficult to create an environment due to a lack of expertise in ornamental fish and continuous management is impossible. Therefore, this paper proposed a micro-process-based automatic water tank management system that can manage water tanks more efficiently and minimizes user intervention. The proposed system measures the pH, temperature, and quantity of the tank environment through sensors, and when the generated data is transmitted to the server to detect abnormalities, the control device operates to properly maintain the environment in the fishbowl. This enables more efficient management than the existing fishing port management system, which has the advantages of manual operation and arbitrary coordination. The management system of this study can be seen as having a similar performance to other temperature control devices, and hot water can be evenly distributed inside the tank through recovery, compensating for the hot water retention phenomenon, which is a disadvantage of the warmer heating water at a designated point.