MTLT를 이용한 광 방향성 필터의 설계

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.

학교와 가정에서 실내 미세먼지 실태

박효진(Park, Hyojin),위지은(Wie, Jieun),김서우(Kim, Seowoo),송윤재(Song, Yunjae),지유나(Ji, Yuna),장서영(Jang, Seo Young),김준수(Kim, Junsu),문병권(Moon, Byung-Kwon) 한국과학영재교육학회 2018 과학영재교육 Vol.10 No.1

이 연구는 전북대학교 과학영재교육원의 사사과정 과제로 수행되었다. 대기 중 미세먼지는 1군 발암물질로 지정될 정도로 위험하며, 미세먼지로 인한 사망률의 증가가 최근 논란이 되고 있다. 우리는 가정과 학교의 미세먼지 실태를 조사하고 미세먼지 농도를 감축할 수 있는 방안을 찾고자 하였다. 미세먼지 농도는 휴대용 장치를 이용하여 측정하였다. 먼저 실내의 먼지 가 외부 농도에 크게 영향을 받는다는 것을 밝혔다. 이와 더불어 집과 학교는 장소에 따라 미세먼지 농도가 약간 다르게 나타났다. 특히 집에서는 방에서, 학교에서는 교무실에서 미세먼지 농도가 낮았다. 학생들이 등교하면 교실의 농도가 증가하였다. 또한 흥미롭게도 실내의 미세먼지는 높이에 따라 약간의 농도 차이가 있었다. 미세먼지 농도는 천정부근보다는 바닥에서 약간 높았다. 기름을 사용한 요리를 할 때 집 안의 미세먼지 농도를 크게 증가시켰다. 이때는 요리가 끝난 후에도 미세먼지 농도의 증가가 지속되는 모습을 볼 수 있었다. 또한 실내의 미세먼지를 제거하기 위해 주로 제안되는 방법인 환기시키는 것이 때로는 효율적이지 못하거나 오히려 농도를 높일 수 있음을 보였다. 우리는 실내 미세먼지를 제거하기 위해서는 공기청정기가 필수적이나 여의치 않다면 에어컨을 활용할 수 있다는 것을 제시하였다. 이 결과는 좀 더 흥미로운 연구를 위한 기초자료로 활용되거나 학교나 가정의 미세먼지 저감에 기여할 것으로 기대된다. This study is based on a research project by gifted students at Science Education Institute for the Gifted in Chonbuk National University. Particulate matter is so dangerous to humans as to be ranked among the Group 1 Carcinogens, and it becomes a more prominent cause of death. This study conducted a survey of particulate matter in houses and schools and considered an effective method of reducing particulate matter concentrations. A portable device was used to measure the concentrations. We showed that indoor particulate matter was much affected by its outdoor concentration. Besides, the particulate matter concentrations had a small variation among different points both in houses and schools. Especially, houses and schools had lower concentrations in rooms and the teachers room, respectively. When students went to school, the concentrations in classrooms increased. Moreover, indoor particulate matter showed a small difference of concentration depending on height. The concentration was a little higher near the floor than the ceiling. Cooking with oils drastically increased the indoor particulate matter concentration in a house. Even when cooking was over, the increase of concentration continued. Ventilation was not so efficient as has been typically suggested to remove indoor particulate matter, or rather often raised the indoor concentrations. We proposed that an air purifier is essential for removing indoor particulate matter, or if it is not available, an air conditioner can be utilized. This result can be basic information for further interesting studies. We also expect that this study will contribute to reducing particulate matter both in house and school.

복분자 식초의 품질특성과 항산화활성

박송이 ( Song Yie Park ),채규서 ( Kyu Seo Chae ),손락호 ( Rak Ho Son ),정지혜 ( Ji Hye Jung ),임영례 ( Young Rae Im ),권지웅 ( Ji Wung Kwon ) 한국산업식품공학회 2012 산업 식품공학 Vol.16 No.4

본 연구에서는 2단계 발효를 통해 복분자 식초를 제조한 후 이에 대한 이화학적 성분 및 항산화 활성을 측정하였다. 복분자 식초의 알코올 발효 종료 후 알코올 함량은 11.78±0.03%이었고, 당도는 8.40±0.05 Brix이었으며, 초산발효 종료 후 알코올 함량은 0.16±0.03%이었고, 산도는 6.07±0.11%이었다. 복분자 식초의 주요 유기산은 acetic acid(4,641.59 mg%)와 citric acid(1,241.05 mg%)이었고, 복분자 식초의 총 폴리페놀, 총 플라보노이드 함량은 각각 38.01 mg/g, 17.91 mg/g이었다. 페놀화합물 중 ellagic acid 함량이 1,127.43ug/g으로 가장 많았으며, gallic acid의 함량은 962.44ug/g을 보였다. 복분자 식초의 DPPH 라디칼소거 활성과 환원력은 500ug/mL 농도에서 각각 60.3%, 0.50이었다. This study was performed to investigate the physicochemical properties and antioxidant activity of bokbunja (Black raspberry) vinegar by two step fermentation. The bokbunja vinegar was contained the highest amount of acetic acid (4,641.59 mg%) followed by citric acid (1,241.05 mg%) among the major organic acids in the vinegar. The total polyphenol and flavonoid contents in bokbunja vinegar were 38.0 mg/g and 17.8 mg/g, respectively. The ellagic acid and gallic acid contents in bokbunja vinegar were 1,127.43ug/g and 962.44ug/g, respectively. At concentration of 500ug/mL bokbunja vinegar, the DPPH radical scavenging activity and reducing power were 60.3% and 0.50, respectively.

방울토마토 신품종 ‘체리스타’ 육성

박권서(Kwon Seo Park),이희경(Hee Kyoung Lee),이문행(Mun Haeng Lee),김경제(Gyoung-Je Kim),윤화모(Wha Mo Yoon) 한국원예학회 2011 한국원예학회 학술발표요지 Vol.2011 No.5

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

부당경량아에서 면역글로부린 G-아형의 농도 및 태반통과에 관한 연구

박국인 ( Kook In Park ),김동수 ( Dong Soo Kim ),남궁란 ( Ran Namgung ),이철 ( Chul Lee ),한동관 ( Dong Gwan Han ),강명서 ( Myung Seo Kang ),권오헌 ( Oh Hun Kwon ) 대한주산의학회 1991 大韓周産醫學會雜誌 Vol.2 No.2

Study of the Electrolytic Reduction of Uranium Oxide in LiCl-Li$_{2}$O Molten Salts with an Integrated Cathode Assembly

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.

DSM을 활용한 도입단계에서의 BIM 설계 관리 프로세스

박문서(Park, Moon-Seo),조주연(Cho, Joo-Youn),이현수(Lee, Hyun-Soo),권성근(Kwon, Sung-Keun),안승준(Ahn, Seung-Jun) 대한건축학회 2012 대한건축학회논문집 Vol.28 No.1

The BIM(Building Information Modeling) is getting special attention as a method of improving operation efficiency. However, few designers can deal with BIM and design a building at the same time. Recently, regarding the utilization of BIM designers and external modellers work together and modellers‘ modelings follow the work of the designers. lt creates confusion of the works and requires reworks. Therefore, it needs development of the design process focused on the flow of information reflecting the reality. The purpose of this study is to analyze the BIM design process at the introduction phase and find out the improvement of the BIM design process by using the Dependency Structure Matrix(DSM).

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.

생태계 기반 어업평가의 위험도 추정에 관한 개선연구

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.