Mo¨ssbauer 분광법에 의한 Ni_(0.8)Zn_(0.2)Fe₂O₄Ferrite에 대한 연구

유연봉,백승수 三陟大學校 産業科學技術硏究所 2003 産業科學技術硏究論文集 Vol.8 No.2

페라이트계 전파흡수체로 사용되이지고 있는 Ni_(0.8)Zn_(0.2)Fe₂O₄를 택하여 800~1100℃각 2시간씩 소결하여 자료를 합성하여 조사하였다. 고온에서 소결할수록 모분발의 XRD peak는 감소하여 spinel ferrite peak이 우세하였으며, 입자의 크기는 증가하였다. 또한 보자력은 감소한 반면 magnetization saturation은 증가하였다. 따라서 본 실험에서는 fernte 제주의 합성온도 1100℃에서 양실의 시료를 합성화하였고 보문말의 ferrite합성이 1100℃에서 가장 활발하였다.

뇌졸중 노인을 돌보는 주간호제공자의 부담감과 예측요인 : 한방병원 입원 노인을 중심으로

유수정,김신미,이윤정,박연환 노인간호학회 2004 노인간호학회지 Vol.6 No.1

Purpose : The purpose of this study was to investigate factors influencing burden in primary caregivers caring for an elderly person who has had a stroke. Method : A convenience sample of 124 primary caregivers of elderly people with a stroke admitted to an oriental medicine hospital participated in this study. Interviews were done with a standardized questionnaire including Caregiver Burden Scale (Chang, 1995). Result: Average burden score was 93.19, indicating a moderate to severe level of burden. Time-dependent burden had the highest score of the sub-domains. For general characteristics, the factors significantly influencing caregiver burden were gender and age of the elderly person, age and educational level of the caregiver, whether living together or not, and the presence of another caregiver. Multiple regression analyses demonstrated that level of ADL of the elderly person, relationship between the elderly person and the caregiver prior to the stroke, caregivers' relation to the elderly person and primary income were significant factors in explaining variance in overall burden. Conclusion : Recognition of high levels of caregiver burden and factors influencing burden will allow us to develop different nursing strategies to decrease caregiver burden in those caring for an elderly person with a stroke.

정신분열병과 Neuregulin 1 유전자의 연합연구

박동연,이유상,조은영,조승희,장용이,전현옥,장수연,윤세창,김종원,홍경수 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.3

Objectives : The authors recently found a suggestive evidence of linkage of chromosome 8p21-12 to schizophrenia in Korean multiplex families. Neuregutin 1 (NRGI) was identified in this locus as a positional and functional candidate gene for Schizo-phrenia, through several independent studies with European and Chinese populations. The purpose of this study is to determine whether NRGl is associated with schizophrenia in Korean population. Methods : Three SNPs (SNP8NRG221533, SNP8NRG241930, SNP8NRG243177) and two microsatellites markers (478B14-848,420M9-1395) located at the 5' end of NRGI were genotyped for 242 unrelated schizophrenia patients and the same num-ber of normal controls. Genetic association was tested by χ²-test (df=1). Not only for the whole patients group but also for asubgroup of patients with auditory hallucination. This subtype showed stronger linkage with chromosome 8p12 in the prior study of the authors with multiplex families. Results : G allele of SNP8NRG241930 was significantly in excess in the subgroup of patients with auditory hallucination compared to the control group (p=0.03, 0R=1.76). We also found that 3 SNPs haplotype TTC (p=0.04, 0R=0.58) and five markers haplotype TTC53 (p=0.01,0R=0.49) were associated with schziophrenia with a protective effect. Three SNPs haplotype CGT which is a part of the at-risk haplotype of the Icelandic schizophrenia families was found in excess in the patients group but no significant association was observed. Conclusion : NRGI might either play a mle in the predisposition to schizophrenia or be in linkage disequilibrium with a causal locus of this illness.

β-lactamase를 생성하는 Xanthomonas maltophilia의 배지조정과 배양조건의 최적화

박선호,유연수 啓明大學校 産業技術硏究所 1998 産業技術硏究所 論文報告集 Vol.21 No.1

Xanthomonas maltophilia, which can produce β-lactamase, were isolated from Galleria mellonella larvae. Medium composition for bacteria growth was optimized. As a result, the best nitrogen source was found to be yeast extract. The medium composition consisted of 5% yeast extract, 0.5% NaCl, and 0.5% KH₂PO₄. The optimum temperature for cell growth was 28℃. The culture pH approached to about 9.0 during the cell growth period regardless of initial pH ranging from 6 to 10. Meanwhile, the carbon sources such as glucose or fructose showed as decreasing trend of pH and thus inhibited the further cell growth. The specific growth rate of X. maltophilia in a 5L-fermentor was 2.6 times greater than that in a flask culture, presumably due to enhanced aeration and agitation conditions.

꿀벌부채명나방 유충으로부터 Xanthomonas maltophilia의 분리 및 동정

박선호,유연수 계명대학교 산업기술연구소 1998 産業技術硏究所 論文報告集 Vol.21 No.1

A symbiotic bacteria associated with Galleria mellonella larva was isolated and identified as Xanthomonas maltophilia sp. by using the BioLog Automated Microbial Identification System. Also three other strains of bacteria were isolated from Galleria mellonella larvae and identified as CDC group DF-3, Enterobacter agglomerans biogroup 5, and Serratia marcescens sp., respectively. Several biochemical and physiological tests were performed to determine the strain characters. X. maltophilia did not adsorb neutral red of bromothymol blue and grew below 37℃. Xanthomonas maltophilia and three other strains were pathogenic against the insect host when they were injected into hemolymph of the insect. X. maltophilia was rod-shaped and its cell size was ranged from 1㎛ to 2㎛.

Optimization of entomopathogenic nematode(EPN) solid culture medium and production conditions

Yeon Su Yu,Sang Hyung Park,Kwang-Hyun Baek 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04

In order to develop solid mass cultivation technology that maximizes insecticide of entomopathogenic nematode(EPN) isolated from Korea, we have studied the optimization of solid culture medium and production conditions. The optimized conditions from the harvest yields and the insecticidal activity against the Galleria mellonella larvae were yeast extract 2.0%, soybean flour 20%, whole milk powder 3%, olive oil 5% and egg yolk 5%. It was also found that the optimum condition of the carrier(polyurethane) content was about 8-12%, the culture time of symbiotic bacteria was about 48 hours, and the inoculation concentration of nematode was 4,000-5,000 per g medium. And the optimal harvesting point in solid culture conditions was confirmed after 12 days of inoculation.

Optimal treatment conditions of CO2 and NH3 for infective stage induction of entomopathogenic nematode(EPN)

Yeon Su Yu,Sang Hyeong Park,Kwang-Hyun Baek 한국응용곤충학회 2019 한국응용곤충학회 학술대회논문집 Vol.2019 No.04

In order to industrialization of the entomopathogenic nematode (EPN) isolated in Korea, it is necessary to switch to infective juveniles. Since the conversion to infective juveniles in the end of solid culture is important against the outside environment, it has a great influence on insecticidal efficacy and shelf life. We investigated whether the concentration of CO2 and NH3 at the end of the solid culture was artificially increased to affect the infective juvenile induction rate. Optimal exposure time for conversion to infective juveniles was 5 minutes for CO2 and 3 minutes for NH3. Optimal treatment time was 9 days after EPN inoculation for both CO2 and NH3. And optimum concentration was 80~90% for both CO2 and NH3 for EPN infective juveniles stage conversion.

CASE REPORTS : Massive Hemoptysis due to Endotracheal Hemangioma: A Case Report and Literature Review

( Yeon Sil Yu ),( Su Hyeon Lee ),( Jin Young An ),( Jeong Min Lee ),( Ji Hoon Kim ),( Young Kyung Lee ),( Eun Ah Jung ),( Sook Hee Song ),( Hye Ok Kim ),( Su Hyun Kim ) 대한결핵 및 호흡기학회 2015 Tuberculosis and Respiratory Diseases Vol.78 No.2

Tracheal hemangioma is a rare benign vascular tumor in adults. We reported a case of massive hemoptysis caused by a cavernous hemangioma in a 75-year-old man. This is the first report, to our knowledge, of a tracheal cavernous hemangioma that presented with massive hemoptysis. The lesion was removed with a CO2 laser under rigid laryngoscopy. Endovascular tumors, such as tracheobronchial hemangiomas, should be considered a diagnostic option in cases of massive hemoptysis without a significant underlying lung lesion.

온 · 오프라인의 시각적 커뮤니케이션에 대한 연구 : 인스턴트 메신저의 이모티콘을 중심으로

유연수(Yu Yeon Su) 한국디지털디자인학회 2007 디지털디자인학연구 Vol.7 No.4

문자를 중심으로 이루어지던 컴퓨터 매개 커뮤니케이션(CMC)은 다양한 형태의 시각적 요소의 등장으로 온라인에서 이루어지는 시각적 커뮤니케이션이 오프라인에까지 영향을 미치는 현상을 보여주고 있다. 인터넷의 등장으로 발생한 온라인의 시각적 요소들은 사용자들의 공통된 이해를 통해 일상 생활에서 사용되고 있다. 특히 인스턴트 메신저에서 사용되고 있는 이모티콘의 경우 이미지와 동적인 요소를 첨가하여 다양한 형태로 개발되어 사용되고 있다. 이에 본 연구에서는 커뮤니케이션 과정에서 나타나는 시각화 과정 및 온·오프라인 간에 교류되는 시각화를 살펴보고자 한다. 이를 위해 오프라인과 온라인에서 이루어지고 있는 시각화 예들을 살펴보고 온·오프라인 간에 교류되는 시각화 과정의 연관성을 찾아보았다. 다음으로 시각적 커뮤니케이션의 요인을 알아보고 이모티콘의 활용 방식을 살펴보기 위해 인스턴트 메신저 사용자들을 대상으로 온라인 설문을 실시하였다. 마지막으로 온·오프라인에서 형성된 시각화 방식이 교류되는 현상을 살펴보고 온라인에서 보이는 시각화 현상의 의미와 발전 가능성을 살펴보았다. As Computer Media Communication (CMC) which used to be text-based has adopted various visual elements online visual communication is affecting offline communication. Online visual elements are used in daily life based on users' common understanding. Especially as for emoticon which is used for instant messengers various formations are being developed in combination with image and animation factors. Thus this study examines the visualization process in communication and the visualization between online and offline media. For this the visualization examples in online and offline will be examined and the connection of the visualization procedures of online and offline methods. Then comes the investigation on the visual communication factors and the internet-based survey among instant messenger users in order to find out the utilizing methods of emoticon. Lastly examined are how the visualization methods connecting online and offline media work as well as the possibilities of development of the online visualization phenomenon.

탄소섬유와 유리섬유로 보강한 원형 공시체의 보강효과

유다연(Yu, Da-yeon),이연우(Lee, Yeon-woo),김민지(Kim, Min-ji),하상수(Ha, Sang-su) 대한건축학회 2022 대한건축학회 학술발표대회 논문집 Vol.42 No.2