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A Simple Scoring Method to Calculate the Homogeneity and Coverage Indices of Dose Volume Histogram
윤명근,박성용,신동호,박중헌,이세병,김대용,김주영,조관호,Yoon Myong-Geun,Park Sung-Yong,Shin Dong-Ho,Park Jung-Hun,Lee Se-Byeong,Kim Dae-Yong,Kim Joo-Young,Cho Kwan-Ho Korean Society of Medical Physics 2006 의학물리 Vol.17 No.1
본 연구의 목적은 세기변조 방사선 치료법(IMRT)에 의해 만들어진 DVH를 이용하여 선량의 균등률(homogeneity) 및 덮임률(coverage) 지수를 구하는 간편한 방법을 제시하는 데 있다. 새로 개발된 지수들은 DVH 곡선을 수학적으로 계단 함수에 fitting 함으로써 구해졌다. 새로 제안된 지수 l는 종양에 대한 선량의 덮임률을 잘 나타내고 있으며 이 지수가 작으면 작을수록 더 좋은 덮임률을 보여주고 있다. 또한 종양의 균등률 지수로 제안된 n 지수는 기존에 사용되고 있는 균등률 지수들보다 좀 더 정확하게 선량의 균등성을 나태내고 있음을 확인하였다. 이들 지수를 이용하여 치료계획에 바탕이 되는 토대를 제시하였으며 여기에서 제안된 지수들이 선량의 균등성과 덮임성에 대해 매우 효과적인 방법이 될 수 있음을 보여주고 있다. The goal of this study was to develop new indices for effectively evaluating the dose coverage and homogeneity based on the target-volume dose-volume histogram (TV-DVH) of intensity-modulated radio-therapy treatment plans. A new coverage Index and a new homogeneity index were developed by integrating a modified TV-DVH and by fitting a TV-DVH with a modified step function, respectively. The coverage index, named the l-index, indicates whether the dose coverage for the target volume is adequate based on user-defined criteria. A lower l-index indicates higher dose coverage of the tumor volume. The index for assessing dose homogeneity in a target volume, named the n-index, is more accurate than the conventional method in evaluating the dose homogeneity in a tumor volume. The baseline treatment plan for a target volume coverage and homogeneity is discussed. The proposed simple indices have been demonstrated to be effective in evaluating the dose coverage and homogeneity for TV-DVHs.
무선계측기를 이용한 회전자팬 및 엔드링에서의 대류 열전달
윤명근,하경표,고상근,Yun, Myeong-Geun,Ha, Gyeong-Pyo,Go, Sang-Geun 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.4
Recently, computer modelling is increasingly used as a design tool, which requires more detailed data for heat transfer coefficients in various regions of the induction motor. But there are little information about those of rotor fan and endring because of difficulty in measuring signals in rotating bodies. In the present studies, the temperature signals were precisely measured with self-developed telemetry system, which had multi-channels and high rotational speed. After some losses were compensated, the heat transfer coefficients of the rotor endring and fan surfaces were measured. Minimum heat transfer region was existed with endcap plate distance and maximum heat transfer was found at some rotor fan width. It was also studied that how the guide plate and endcap inside rib effected on the rotor heat transfer. The higher heat transfer were obtained with decreasing guide plate distance, increasing the number and height of endcap inside rib. The correlation equations of the results were obtained and compared with others. Above results of the heat transfer coefficients can be used as basic data for cooling design of the various kind of motors.
전폐형 유도전동기의 온도분포에 관한 수치 및 실험적 해석
윤명근,고상근,한송엽,이양수,Yun, Myeong-Geun,Go, Sang-Geun,Han, Song-Yeop,Lee, Yang-Su 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.3
We studied the temperature distribution and heat transfer characteristics of TEFC induction motor with thermal network program for more efficient design and better cooling performance of it. We knew the characteristics and the windage loss of outer cooling fan from fan test experiments. Frame axial and peripheral heat transfer coefficients and endwinding heat transfer coefficient were measured by various model experiments and then, compared with other experimental results. Frame was the main heat transfer surface, load-side and fan-side surface were not thermally symmetric from the heat flux distribution analysis. Steady and unsteady temperature distributions were measured by real motor experiments. From the results, we knew that rotor surface temperature was higher than coil temperature and the hottest spot in the coil was loadside endwinding outside surface. We compared the simulation results with those of real motor test and the two results showed a good agreement.
A constant-time chunking algorithm for packet-level deduplication
윤명근 한국통신학회 2019 ICT Express Vol.5 No.2
Redundancy elimination or deduplication over network packets requires significant computing resources to find basic units of repeated contents, called chunks, by checking every byte in every packet. In this paper, we present the first constant-time chunking algorithm that divides every packet into a predefined number of chunks, irrespective of the packet size. In addition, we present the best implementation practice for packet-level deduplication by selecting an optimal combination of chunking, fingerprinting, and hash table algorithms. Through experiments with real traffic, we confirm that the throughput is improved by three times, compared with even the state-of-the-art scheme.
전폐형 유도전동기 엔드와인딩 표면의 열전달에 미치는 회전자팬의 영향
윤명근,고상근,Yun, Myeong-Geun,Go, Sang-Geun 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.7
The end winding is an important part in induction motor for thermal analysis. But there is little information on the heat transfer coefficient of that surfaces because of geometrical complexity. So our experimental object is to know the heat transfer coefficient of end winding and find the optimum design parameter of rotor fan. Carbon coated papers were used for a uniform heat generating surfaces which were easy to fabricate. The experiments of some parameters were performed as varying rotation speed of rotor fan. We obtained the local and average Nusselt number of the end winding surfaces by correcting radiation and conduction losses errors. The results showed that the average Nusselt number increased with rotor fan blade number and width but decreased with end winding length. However, the increasing limits existed in the case of rotor fan width and blade number. So optimum design value were obtained for rotor fan width and blade numbers.
여러가지 열적 변수가 전폐형 유도전동기의 코일온도상승에 미치는 영향에 관한 연구
윤명근,하경표,이양수 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.4
At design stage of new motor or when taking remedial action of old motor, a lot of information can be obtained from thermal parameters analysis. This study focused on the temperature rise of TEFC induction motor with respect to various thermal parameters. Frame heat transfer had the most important effect on coil temperature rise. But those of air gap and rotor fan had no effect. This fact shows fan action is more important than fin action in the case of rotor fan. Coil temperature can be more decreased by cooling near the heat sources than any other parts from the results of thermal conductivity and loss tests. Variation of cooling air flow rate and motor volume effects on coil temperature were also tested. These tests suggest that improvement of cooling fan performance is important in reducing the coil temperature rise. Thermal equivalent program was verified by comparison of some experimental results.