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4 cm 이하의 단일결절 간세포암종에서 고주파열치료와 경동맥화학색전술의 효과 비교
양민재 ( Min Jae Yang ),안소연 ( So Yun An ),문은준 ( Eun Joon Moon ),이민석 ( Min Suk Lee ),황주안 ( Joo An Hwang ),정재연 ( Jae Youn Cheong ),원제환 ( Je Hwan Won ),김재근 ( Jai Keun Kim ),왕희정 ( Hee Jung Wang ),조성원 ( Sung 대한간학회 2009 Clinical and Molecular Hepatology(대한간학회지) Vol.15 No.4
Carcinoma, Hepatocellular, Radiofrequency ablation, Chemoembolization, Therapeutic, 간세포암종, 고주파열치료, 경동맥화학 색전술 Background/Aims: Radiofrequency ablation (RFA) is an established curative therapeutic modality for unresectable hepatocellular carcinoma (HCC), and transarterial chemoembolization (TACE) has been used as a palliative treatment for inoperable HCC. It is still unknown whether RFA and TACE are equally effective for improving the survival of patients with unresectable HCC that is amenable to either treatment. The aim of this retrospective study was to compare the clinical impacts of two treatments, and analyze the prognostic factors for recurrence and survival. Methods: Ninety-three patients with a single HCC smaller than 4 cm who showed complete responses (complete ablation or complete lipiodol tagging) after treatment with RFA (n=43) or TACE (n=50) between January 2002 and February 2009 were investigated. Univariate and multivariate analyses were performed for 13 potential prognostic factors using the Cox proportional-hazards model. Results: The time-to-recurrence rates at 1, 2, and 3 years after treatment were 32.9%, 44.3%, and 55.4%, respectively, for the RFA group, and 42%, 68.3%, 71.7% for the TACE group. The probability of survival at 1, 2, and 3 years was 97.7%, 77.4%, and 63.1%, respectively, for the RFA group, and 95.9%, 76.1%, and 60.2% for the TACE group. The time-to-recurrence and overall survival rates did not differ significantly between the two treatment groups. A multivariate Cox proportional-hazards model revealed that a tumor size larger than 3 cm and lower serum albumin levels were independent risk factors for recurrence, and that being male, being seropositive for hepatitis B surface antigen, and having a higher serum albumin level were independent favorable prognostic factors for survival. Conclusions: TACE and RFA exhibited similar therapeutic effects in terms of recurrence and survival for patients with a single HCC smaller than 4 cm, if they could exhibited complete responses. (Korean J Hepatol 2009;15:474-485)
국외 관광목적지 속성에 따른 시장세분화와 포지셔닝 연구
오민재(Min Jae Oh),이후석(Hoo Suk Lee),양승용(Seung Yong Yang) 한국관광연구학회 2009 관광연구저널 Vol.23 No.1
The goal of this research was to identify the attributes of outbound destinations which tourists choses. Through positioning analysis with MDS(Multidimensional Scaling) used, the competing power for the attributes of destination which a total of tourists choses was graded by communication(HKG, PHL in order), event(HKG), culture(CHN, PHL, JPN, USA), facilities & recreation(THA, CHN, JPN, USA). The attributes according to tourist groups are as follows; In the case of recreation seekers, it was graded by communication(HKG, PHL, JPN in order), facilities(HKG, THA, JPN), culture & recreation(PHL, CHN), event(CHN, THA, USA). Multi-purpose seekers, it was graded by communication(THA, JPN, CHN), culture(CHN, PHL, JPN), facilities & event(HKG, PHL, JPN), recreation(HKG, USA, PHL). Culture seekers, it was graded by communication(HKG, PHL, CHN), event & recreation(HKG, THA, JPN), facilities(THA, HKG, JPN) and culture(THA, USA, JPN).
골프코스에 대한 지각된 서비스품질이 골프장이미지에 미치는 영향
오민재(Min Jae Oh),양승원(Seung Won Yang),양승용(Seung Yong Yang) 한국사회체육학회 2010 한국사회체육학회지 Vol.0 No.41
The objective of this study is to measure how much effect the service quality of a golf course has on the image of the course. To accomplish this objective, 400 customers of golf course`s were collected for sample group, and 374 materials were used for final analysis. The conclusion from the material analysis by using frequency analysis, reliability analysis, factor analysis, and multiple regression is as follows : First, physical qualities consist of five factors that is scenery, degree of difficulty, shape of course, course`s condition and ambiance. Process qualities consist of six factors that is club house, tee off, booking, driving range, caddie and cart. And golf course image was classified into marketing, convenience, accessibility and aesthetic. Second, the findings of the multiple regression to analyze the effect of service quality(physical and process quality) on golf course`s `marketing` images showed that related to scenery, degree of difficulty, course` s condition, ambiance, driving range and caddie. Ten service qualities(scenery, degree of difficulty, course`s condition, ambiance, club house, tee off, booking, driving range, caddie and cart) of eleven factors had a significant effect on golf course`s `convenience` image. Also, ten service qualities(scenery, degree of difficulty, shape of course, course`s condition, ambiance, club house, tee off, booking, caddie and cart) of eleven factors had a significant effect on golf course`s `accessibility` image. And `aesthetic` images related to scenery, degree of difficulty, course`s condition, ambiance, club house, tee off, booking and driving range.
MPPT 제어 기능을 갖는 진동에너지 수확을 위한 CMOS 인터페이스 회로
양민재,윤은정,유종근,Yang, Min-Jae,Yoon, Eun-Jung,Yu, Chong-Gun 한국전기전자학회 2016 전기전자학회논문지 Vol.20 No.1
본 논문에서는 진동에너지 수확을 위한 MPPT (Maximum Power Point Tracking) 제어 기능을 갖는 CMOS 인터페이스 회로를 설계하였다. 간단한 구조와 적은 비용으로 출력을 안정화시키기 위해 전력변환기인 DC-DC 부스트 변환기의 출력 단에 PMU (Power Management Unit)를 이용하는 구조를 제안하였다. 또한, 진동소자로부터 최대전력을 수확하여 시스템의 효율을 향상시키기 위해 FOC (Fractional Open Circuit) 방식의 MPPT 제어회로를 설계하였다. 진동소자 (PZT)에서 출력되는 AC 신호는 AC-DC 변환기를 통해 DC 신호로 변환되며, DC-DC 부스트 변환기를 거쳐 승압되고, PMU에 의해 듀티 (duty)를 갖는 안정화된 신호로 변환되어 부하로 공급된다. AC-DC 변환기는 효율 특성이 좋은 능동 다이오드를 이용한 전파정류기를 사용하였으며, DC-DC 부스트 변환기는 제어회로가 간단한 쇼트키 다이오드를 이용한 구조를 사용하였다. 제안된 회로는 $0.35{\mu}m$ CMOS 공정으로 설계되었으며, 설계된 칩의 면적은 $915{\mu}m{\times}895{\mu}m$이다. 설계된 회로의 성능을 검증한 결과 전체회로의 최대 전력효율은 83.4%이다. This paper presents a CMOS interface circuit for vibration energy harvesting with MPPT (Maximum Power Point Tracking). In the proposed system a PMU (Power Management Unit) is employed at the output of a DC-DC boost converter to provide a regulated output with low-cost and simple architecture. In addition an MPPT controller using FOC (Fractional Open Circuit) technique is designed to harvest maximum power from vibration devices and increase efficiency of overall system. The AC signal from vibration devices is converted into a DC signal by an AC-DC converter, and then boosted through the DC-DC boost converter. The boosted signal is converted into a duty-cycled and regulated signal and delivered to loads by the PMU. A full-wave rectifier using active diodes is used as the AC-DC converter for high efficiency, and a DC-DC boost converter architecture using a schottky diode is employed for a simple control circuitry. The proposed circuit has been designed in a 0.35um CMOS process, and the designed chip occupies $915{\mu}m{\times}895{\mu}m$. Simulation results shows that the maximum power efficiency of the entire system is 83.4%.