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Park, HyeMin,Joo, Koan Sik,Kim, Jeong Ho,Kim, Dong Sung,Park, Ki Hyun,Park, Chan Jong,Han, Woo Jun The Korean Association for Radiation Protection 2016 방사선방어학회지 Vol.41 No.3
Background: To optimize the photon transmission efficiency of light guides used in scintillation detectors, LightTools code, which can construct and track light, was used to analyze photon transmission effectiveness with respect to light guides thickness. Materials and Methods: This analysis was carried out using the commercial light guide, N-BK 7 Optical Glass by SCHOTT, as a model for this study. The luminous exitance characteristic of the LYSO scintillator was used to analyze the photon transmission effectiveness according to the thickness of the light guide. Results and Discussion: The results of the simulations showed the effectiveness of the photon transmission according to the thickness of the light guide, which was found to be distributed from 13.38% to 33.57%. In addition, the photon transmission efficiency was found to be the highest for light guides of 4 mm of thickness and a receiving angle of $49^{\circ}$. Conclusion: Through such simulations, it is confirmed that photon transmission efficiency depends on light guide thickness and subsequent changes in the internal angle of reflection. The aim is to produce an actual light guide based on these results and to evaluate its performance.
컨조인트 분석을 이용한 지식정보 데이터베이스 서비스 품질에 대한 고객 선호도 조사
박혜민(Hyemin Park),박희준(Heejun Park),백민호(Minho Baek),박종우(Jongwoo Park) 한국IT서비스학회 2008 한국IT서비스학회지 Vol.7 No.2
This research is to study the core factors for knowledge information database service and very important database service quality factors to improve customer satisfaction. The database service quality has been critical issue rather than just information service in these days, because the qualitative aspect is becoming more important factors rather than quantitative aspect. As database service quality has been influenced by satisfaction of database user, it needs to try to get excellent results by enhancing ability to obtain information. In order to satisfy this condition, it needs to measure database service quality more accurately first. In this study, we apply conjoint analysis to measure how much to give quality condition to achieve customer satisfaction.
Dan-Be Park,Jung-Il Cho,Hyemin Lim,Zamin Shaheed Siddiqui,Sung-Han Park,Mi-Jeong Jeong,Gang-Seob Lee,Soo-Chul Park 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07
Transgenic potatoes expressing glyceraldehyde-3-phosphate dehydrogenase (GPD), isolated from the oyster mushroom, Pleurotus sajor-caju, had increased tolerance to salt stress (Jeong et al. 2001). To examine the physiological mechanisms enhancing salt tolerance in GPD transgenic rice plants, the salt tolerance of five GPD transgenic rice lines (T1–T5) derived from Dongjin rice cultivar was tested in a fixed 150-mM saline environment in comparison to two known wild-type rice cultivars, Dongjin (salt sensitive) and Pokali (salt tolerant). Transgenic lines T2, T3, and T5 showed a substantial increase in biomass and relative water content compared to Dongjin. Stomatal conductance and osmotic potential were higher in the GPD transgenic lines and were similar to those in Pokali. The results are discussed based on the comparative physiological response of GPD transgenic lines with those of the salt-sensitive and salt-tolerant rice cultivars.
Correlation Analysis: Game Professional Score and User Score on Steam
Hyemin Park,Haewon Byun 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.12
Game ratings have been one of the most important factors in the online game purchase. The game ratings are numerical scores and its two types are professional score and user score. This paper presents the experiments focusing on the relationship between professional score and user score across 2,069 games distributed by the Steam platform. We also investigated a various game genres for the analysis of the relationship between two rating scores. A better understanding of the relationships of the two scores would be of great value when game users want to choose their favorite games. Our experiments found that indie game and casual game has no differences between two scores. Notably, most major games which are developed by some big game companies have differences between professional scores and user scores. Another more factors can affect the game ratings for the big major games, such as advertising and promotion.
( Hyemin Jo ),( Seong Kyu Park ),( Jong Ho Won ),( Dae Sik Hong ),( Se Hyung Kim ),( Jina Yun ),( Hyung Jung Kim ),( Kyoung Ha Kim ),( Sang Byung Bae ),( Kyu Taeg Lee ),( Hee Sook Park ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: fiudarabine has been used in combination with standard doses of intravenous injection of busulfan, thus reducing the toxicity observed with cyclophosphamide/ busulfan regimens. But some studies have documented that fiudarabine based regimen was associated with an increased risk of relapse. However, it is unclear whether the additional use of anti-thymocyte globulin (ATG) to decrease the risk of acute graft versus host disease (GVHD) leads to improved clinical outcomes in this condition. Methods: We evaluated the impact of ATG, to decrease the incidence of acute GVHD, on the clinical outcome including transplant related mortality and relapse rate in patients received myeloablative conditioning based on fiudarabine/busulfan. Donors were fully HLA matched (6 out of 6 match for sibling donors). The dose of ATG was 4.0~6.0 mg/kg body weight for 2 or 3 consecutive days. Results: Totally 66 patients undergoing allogeneic hematopoietic stem cell transplantation using peripheral blood stem cells were evaluated. The median follow-up time was 36 months. The incidence of acute GVHD (=grade2) requiring treatment was not significantly changed by the addition of ATG (ATG group;27.8% versus non-ATG group;29.2%). Transplant related mortality seemed to be lower in cases treated with ATG. The incidence of relapse was significantly higher in ATG group (38.9% versus 18.8%). 5 year disease free survival seemed to be lower in ATG group and 5 year overall survival was not significantly different between two groups. Conclusions: Conclusively, adding ATG to fiudarabine based conditioning may not guarantee significant benefit of clinical outcomes in a setting of transplantation from a sibling donor. Therefore, a careful consideration of the use of ATG based on the patient`s condition and the risk factors of the transplantation setting should be made.