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조사야 확인용 film을 이용한 자궁 경부암 환자의 조사야 정확성 연구
정희영,권영호,정덕양,황웅구,김유현,Jung Hee-Young,Kweon Young-Ho,Jeong Deok-Yang,Whang Woong-Ku,Kim You-Hyun 대한방사선치료학회 1995 大韓放射線治療技術學會誌 Vol.7 No.1
1. Purpose : 30 patients with uterine cervical cancer who had been treated at Department of radiation Oncology of Korea university Hospital from June, 1, 1994. to December. 31, 1994. were analyzed to the radiation field accuracy using verification films. 2. Methods and Materials : 30 patients were divided by 6 groups, 5 patients respectively : Group (1) : Standard physique, supine not-fixed Group (2) : Standard physique, supine fixed Group (3) : Obesity physique, supine, not-fixed Group (4) : Obesity physique, supine, not-fixed Group (5) : Obesity physique, prone, not-fixed Group (6) : Obesity physique, prone, fixed All groups were taken verification fimls during the whole treatment period, and it compared with simulation films and portal fimls, 3. Results : This results suggest that all patients should be immovilized and especially obesity physique patients should be treated by prone position in order to reduce radiation field discrepancy. In addition, this results should help to prescribe appropriate safty margins for patients simulation.
예약 주소를 이용한 Mobile IPv6에서의 효율적인 핸드오버 지원
정희영,Jung, Hee-Young 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.2A
본 논문에서는 Mobile IPv6에서 실시간 서비스를 효율적으로 지원할 수 있는 핸드오버 확장 기술을 제안한다. 제안된 방법은 핸드오버를 위해 미리 예약된 주소를 활용함으로써 기존의 FMIPv6와 같이 복잡한 절차를 가지지 않고도 Mobile IPv6에서의 핸드오버 지연을 상당히 줄일 수 있다. Mobile IPv6와 제안된 방법과의 핸드오버 지연 분석을 통하여 제안된 방법이 Mobile IPv6에 비하여 현재의 규격상으로도 최소 1초, 평균 3초 이상의 핸드오버 지연을 줄일 수 있음을 확인하였다. 따라서 제안된 방법은 이동 인터넷에서 VoIP와 같은 실시간 서비스에 대한 요구가 증가하고 있는 현재의 추세를 고려할 때 Mobile IPv6 기반의 이동 인터넷 환경에서 실시간 서비스를 제공하기 위한 유력한 기술로 고려될 수 있을 것이다. This paper proposes a handover extension scheme to support effectively real-time services in Mobile IPv6 networks. The proposed scheme could simplify the handover procedure by using the proposed reserved addresses scheme so that it could reduce considerably handover latency in Mobile IPv6. The performance analysis shows that the handover latency in the proposed scheme could be reduced by minimum 1 second, maximum above 3 second compared to that of pure Mobile IPv6. Accordingly the proposed scheme could be considered as a strong candidate to support real-time services like VoIP in future network based on Mobile IPv6.
정희영(Hee-Young Jung),김현준(Hyun-Joon Kim) 한국트라이볼로지학회 2020 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.36 No.6
The rapidly increasing threats to the environmental has increased the demand for biodegradable lubricants. Vegetable oils, such as olive, coconut, and sunflower oils, are readily obtainable and are not harmful, unlike synthetic and mineral oils. The tribological characteristics of these oils should be adequately examined for industrial applications. In this study, the lubrication characteristics of olive oil is investigated using a pin-on-disk-type tribometer under 500 gf of normal force, and the examination results are compared and analyzed with those of commercial synthetic lubricants for friction and wear. In addition, stearic acid, which is a type of saturated fatty acid, is mixed with olive oil as an additive to improve its lubrication characteristics. Olive oil with stearic acid additive is thus observed to exhibit the lowest friction coefficient for rotational speeds of 200 to 800 rpm. According to the wear analysis, a minimal amount of wear is observed when no additive is used. Hence, olive oil is able to effectively reduce friction and wear at relatively low speeds. These low friction and wear characteristics of olive oil are attributed to its compatibility with the substrate.