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박성빈,서중석,강대승,권선길,박성원,Park Sung-Bin,Seo Chung-seok,Kang Dae-Seung,Kwon Seon-Gil,Park Seong-Won Korean Radioactive Waste Society 2005 방사성폐기물학회지 Vol.3 No.2
The electrolytic reduction of uranium oxide in a LiCl-Li$_{2}$O molten salt system has been studied in a 10 g U$_{3}$O$_{8}$ /batch-scale experimental apparatus with an integrated cathode assembly at 650$^{\circ}C$. The integrated cathode assembly consists of an electric conductor, the uranium oxide to be reduced and the membrane for loading the uranium oxide. From the cyclic voltammograms for the LiCl-3 wt$\%$ Li$_{2}$O system and the U$_{3}$O$_{8}$-LiCl-3 wt$\%$ Li$_{2}$O system according to the materials of the membrane in the cathode assembly, the mechanisms of the predominant reduction reactions in the electrolytic reactor cell were to be understood; direct and indirect electrolytic reduction of uranium oxide. Direct and indirect electrolytic reductions have been performed with the integrated cathode assembly. Using the 325-mesh stainless steel screen the uranium oxide failed to be reduced to uranium metal by a direct and indirect electrolytic reduction because of a low current efficiency and with the porous magnesia membrane the uranium oxide was reduced successfully to uranium metal by an indirect electrolytic reduction because of a high current efficiency.
박희원 ( Hee Won Park ),장창익 ( Chang Ik Zhang ),권유정 ( You Jung Kwon ),서영일 ( Young Il Seo ),오택윤 ( Taeg Yun Oh ) 한국어업기술학회 2013 수산해양기술연구 Vol.49 No.4
This study identified problems of the existing ecosystem-based fisheries assessment approach, and suggested new methods for scoring risk and for the estimation of fishery risk index. First, risk scores of zero to two for target and limit reference points for each indicator were replaced by those of zero to three, and the risk scores were calculated from new formulae which were developed in this study. Second, a new method for estimating fishery risk index (FRI) was developed in this study, considering the level of indicators. New method was applied to the Korean large purse seine fishery, large pair trawl fishery and drag net fishery. More precise and detailed risk scores were obtained from the new method, which can explain the risks by the wider range of both risk levels for ``better than target`` and ``beyond limit``. The new method for estimating FRI could avoid the basic problem related with duplicated computations of fishery-level indicators, which improved the estimated FRI to be more accurate. Also, a method for estimating variance of FRI using the bootstrap was proposed in this study.
광섬유-탐침과 근적외선(NIR) 분광기를 이용한 약제분말 유동층 혼합공정의 인라인 모니터링 연구
박초롱 ( Cho Rong Park ),김아영 ( Ah Young Kim ),이민정 ( Min Jeong Lee ),이혜은 ( Hea Eun Lee ),서다영 ( Da Young Seo ),신상문 ( Sang Mun Shin ),최용선 ( Yong Sun Choi ),권병수 ( Byung Soo Kwon ),방규호 ( Kyu Ho Bang ),강호경 ( H 한국약제학회 2009 Journal of Pharmaceutical Investigation Vol.39 No.1
박재서,홍권의,호광춘,Park, Jai-Seo,Hong, Kwon-Eui,Ho, Kwang-Chun 한국전기전자학회 2001 전기전자학회논문지 Vol.5 No.2
모드 전송선로 이론(MTLT: Modal Transmission-Line Theory)을 사용하여 방향성 결합기로 구성된 광 파장 필터를 설계하고 그 특성을 정확히 분석하였다. 전형적인 평면 구조형 결합기가 협대역 필터를 구현하기 위하여 이용되었으며, 테이퍼형 방향성 결합기가 광대역 필터를 구현하기 위하여 채택되었다. 협대역 필터의 경우 TE/TM 모드는 ${\lambda}=1.303{\mu}m$와 $1.1496{\mu}m$에서 최대 결합효율을 나타냈으며, 그 대역폭은 각각 30nm와 10nm로 나타났다. 더욱이, ${\lambda}=1.55{\mu}m$에서 동작하는 광대역 필터의 경우 TE/TM모드의 결합길이를 $183{\mu}m$와 $178{\mu}m$로 선택하였을 때 각각 저지대역(stop-band)과 통과대역(pass-band) 필터특성을 나타내었다. Optical wavelength filters based on directional couplers are rigorously designed and analyzed by Modal Transmission-Line Theory (MTLT). The conventional parallel directional coupler is utilized to implement a narrow-band filter, and it takes up the coupler with tapered structure as a wide-band filter. The power transfers of TE/TM modes in narrow-band filters are maximized at ${\lambda}=1.303{\mu}m\;and\;1.1496{\mu}m$, and the optical bandwidths are then 30nm and 10nm, respectively. Furthermore, when the coupling lengths of TE/TM modes in wide-band filters operating at ${\lambda}=1.55{\mu}m$ are selected as $183{\mu}m\;and\;178{\mu}m$, those are operated as the stop-band and pass-band filters, respectively.
매실 식초 분말의 항산화 및 유방암 세포주 증식 억제 효과
박울림(Wool-Lim Park),김정호(Jeong-Ho Kim),허지안(Ji-An Heo),원영선(Yeong-Seon Won),서권일(Kwon-Il Seo) 한국생명과학회 2021 생명과학회지 Vol.31 No.2
매실은 주로 한국, 일본, 중국 같은 동아시아에 분포하고, 매실 나무의 열매는 한약재나 식재료로 쓰여왔다. 그러나 매실 열매를 이용한 이전의 연구는 대부분 추출물 형태로 진행하였기에, 많은 식품학적인 활용을 위해 매실열매의 다양한 가공형태에서의 연구가 필요한 실정이다. 본 연구에선 분무 건조한 매실 식초 분말(SPP)의 이화학적 특성과 생리활성을 평가하였다. SPP의 이화학적 특성에서 당도, pH, 총산도 및 수분 함량은 각각 8.90 °Brix, 3.19, 1.05% 및 3.07%로 확인되었다. SPP의 항산화 활성은 DPPH 라디칼 소거활성, 환원력 및 H₂O₂ 소거활성에서 각각 65.55%, 1.48 및 48.07%로 양성 대조군과 비슷하거나 다소 낮게 유의적으로 높은 항산화 활성을 나타냈다. 또한 SPP를 농도별로 처리함에 따라 MDA-MB-231 인체 유방암 세포에서 유의적인 세포 증식 억제 활성을 보였다. 형태학적 연구에서 MDA-MB-231 세포에서 농도의존적으로 세포의 형태학적 변화가 확인되었고, apoptotic body와 핵의 응축을 나타냈다. 총 폴리페놀 및 플라보노이드 함량은 59.58 ㎍/g과 57.56 ㎍/g으로 확인되었다. 이러한 연구 결과를 통해 분무 건조한 매실 식초 분말은 항산화 및 암세포 증식억제능이 있는 기능성 식품 및 천연 의약품 소재로 활용이 가능할 것으로 생각된다. Prunus mume Sieb. et Zucc is widely distributed in East Asia (Korea, Japan, and China), and its fruit is often used as a medication and food material. However, because most previous studies have only investigated the state of Prunus mume fruit extract, studies on the various ways of processing this extract are still needed to increase its utilization. In this study, we evaluated the physicochemical properties and physiological activities of spray-dried Prunus mume vinegar powder (SPP). The sugar content, pH, total acidity, and moisture content of the SPP were 8.90 °Brix, 3.19, 1.05%, and 3.07%, respectively. The SPP exhibited significantly high antioxidant activity in terms of DPPH radical scavenging activity (65.55%), reducing power (1.48), and hydrogen peroxide scavenging activity (48.07%). In addition, the SPP remarkably decreased the cell viability of human breast MDA-MB-231 and human skin cancer SK-MEL-28 in a dose-dependent manner. The morphological results of the treatment of MDA-MB-231 cells with SPP were distorted, shrunken cell masses. Furthermore, apoptotic bodies and nuclear condensation formed in the SPP-treated MDA-MB-231 cells. The total polyphenol and flavonoid contents of the SPP were 59.58 ㎍/g (gallic acid equivalent) and 57.56 ㎍/g (quercetin equivalent). The results of this study indicate that SPP, which has antioxidant activity and anticancer effects, can be useful in the development of natural medicines and functional food ingredients.
교통사고 환자 35예에 대한 한방의료 서비스 만족도 조사
박단서 ( Darn Seo Park ),필감흔 ( Chien Hsin Pi ),이정한 ( Jeong Han Lee ),공재철 ( Jae Cheol Kon ),백동기 ( Dong Gi Baek ),송용선 ( Yung Sun Song ),권영미 ( Young Mi Kwon ) 한방재활의학과학회 2008 한방재활의학과학회지 Vol.18 No.3
Objectives : This study aimed to understand the satisfaction degree of patients due to traffic accident(TA) in order to provide basic data which would give help not only to improve the quality of services, but also to strengthen the competitiveness of oriental medical hospitals on sequela of TA patients. Methods : The data were collected from inpatients and outpatients who answered a self-report questionnaire. Independent t-test, analysis of variance(ANOVA), X2-test, correlation analysis were used for data analysis. Results : According to the research on medical satisfaction degree, the overall satisfaction degree was 4.141. On each field, satisfaction degree related to the doctor service recorded the highest degree among others(4.474). Satisfaction degree related to the appropriateness of service was the second(4.091). On the other hand, satisfaction degree of using procedure was the lowest degree(3.857). On the difference of degrees of satisfaction by general characteristics, patients who were unemployed·houseworker group showed lower doctor service satisfaction degree than that of other groups. However, on the difference of degrees of satisfaction related to other general characteristics, there were no signigicant differences(p<0.05). Conclusions : The service distribution of oriental medical hospital was almost equal without concentrating on specified social classes.