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느타리버섯의 갈반병 원인균에 대한 길항세균 선발에 관한 연구
조재선,이은관,유승오,전억한 경희대학교 생명자원과학연구원 1997 硏究論文集 Vol.18 No.-
갈반병이 이병된 느타리 버섯과 버섯 재배장 주변 토양으로부터 채집한 균주로부터 갈반병 원인 균주 4개와 갈반병 길항 균주 3개를 선발 하였다. 선발된 균주를 API 20E kit에 의해 동정한 결과 갈반병 원인 균주 P-24, P-28은 P. putida로 P-27, P-33은 lane 1: PCR marker lane 2: P.fluorescens P. tolaasii로 동정 되었으며, 길항 균주중 A-11, A-20은 P. fluorescence로 A-29는 Pseudomonas sp.로 동정 되었으나, RAPD PCR 방법에 의한 유전적 유사성은 모든 균주가 다른 양상을 보였다(Fig. 5). 이는 생화학적 방법에 의한 Pseudomonas 계통의 균주 동정의 기술이 확립되지 않은 점도 있으며, 유전적 유사성은 달라도 같은 속의 균주가 많은 것으로 사료 된다. 길항성은 갈반병 원인 균주 대 길항 균주가 1:1의 농도로 길항성이 양호하여 Nair등(1972)의 보고 보다 우수한 길항성을 보였다. Screening experiments were carried out in order to select bacteria causing brown blotch disease on the mushroom. especially, Pleurotus ostreatus. Four brown blotch disease causing bacteria were isolated from the Pleurotus ostreatus and the soil around mushroom farm. Three other strains, A-11, A-20, A-29 showing antagonism against four brown blotch causing bacteria through pitting test and cross checking and found to be identified as Pseudomonas fluorescence for A-11 and A-20, and Pseudomonas sp. for A-29, respectively. Colony morphology test also showed that A-11 and A-29 were appeared as transparent gel with green color and A-20 colony showed opaque gel with light green color.
웹 취약점 잘못된 조치 사례 및 취약점 조치방법에 대한 연구
유승상, 조인준 배재대학교 공학연구소 2021 공학논문집 Vol.23 No.1
With the development of the times, state agencies and companies are processing using business programs implemented on their respective websites. Due to this processing method, homepage services necessary for work and daily life are continuously increasing, and hacking accidents are also increasing accordingly. In order to prevent such hacking accidents, web vulnerabilities can be checked and hacking accidents can be prevented by actions such as taking measures against discovered vulnerabilities, but wrong measures can lead to hacking accidents as vulnerabilities are not removed. The purpose of this paper is to help prevent hacking by shortening the time to remove vulnerabilities by presenting accurate measures based on cases of wrong measures against major vulnerabilities of administrative agencies. 시대의 발전에 따라 국가 기관 및 기업에서 각각의 홈페이지에 구현되어 있는 업무 프로그램 등을 이용하여 처리하고 있다. 이러한 처리방식으로 인하여 지속적으로 업무 및 일상에 필요한 홈페이지 서비스가 증가하고 있으며, 그에 따른 해킹사고 역시 증가하고 있다. 이러한 해킹사고를 예방하기 위해 웹 취약점 점검을 진행하며, 발견된 취약점을 조치하는 등의 행위로 해킹사고를 예방할 수 있으나 잘못된 조치 방법으로 인하여 취약점 제거가 되지 않아 해킹사고로 이어질 수 있다. 해당 논문에서는 행정기관의 주요 취약점 TOP10에 대한 잘못된 조치 사례를 바탕으로 정확한 조치 방법을 제시, 취약점 제거 시간을 단축하여 해킹 예방에 도움을 주는데 목적이 있다.
아미노산 투여가 운동중 싸이클선수의 젖산 및 심박수에 미치는 영향
이승국,유병렬,김문희,김완조,이선장 韓國體育大學校附屬 體育科學硏究所 1992 韓國體育大學校附屬 體育科學硏究所論文集 Vol.11 No.1
The purpose of the study was to determine whether a 15.6mg.Kg ??' does of glutamate given one hour prior to incremental exercise test would reduce the lactate formation. Five well trained cyclists served as subjects in this experiment which included a placebo and glutamate trial. The subjects initially work on treadmill 200m/min for 3 minutes and here increased the workload by 20m/min every 3minutes until exhaustion. Blood lactate were collected from finger-tip. Subjects in the glutamate trial showed significantly lower lactate formation during exercise then they did in the placebo trial. In both groups no significant difference was found on heart rate. During the recovery lactate and heart, rate were unaltered in either the glutamate or placebo trials. In summary, glutamate ingestion may reduce lactate formation resultly improvement of performance.
Direct observation of thermal disorder and decomposition of black phosphorus
Yoo, Seung Jo,Kim, Heejin,Lee, Ji-Hyun,Kim, Jin-Gyu IOP 2018 Nanotechnology Vol.29 No.6
<P>Theoretical research has been devoted to reveal the properties of black phosphorus as a two-dimensional nanomaterial, but little attention has been paid for the experimental characterization. In this study, the thermal disorder and decomposition of black phosphorus were examined using <I>in situ</I> heating transmission electron microscopy experiments. We observed that the breaking of crystallographic symmetry begins at 380 °C under vacuum condition, followed by the phosphorus evaporates after long-term heating at 400 °C. This decomposition process can be initiated by the surficial vacancy and proceeds toward both interlayer ([010]) and intralayer ([001]) directions. The results on the thermal behavior of black phosphorus provide useful guidance for thin film deposition and fabrication processes with black phosphorus.</P>
Seung Jo Yoo,,Jin-Gyu Kim,Chang-Yeon Kim,Eun-Mee Kim,Ji-Hyun Lee,김영민,유석재,Seong Bong Kim,Youn-Joong Kim 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.6
The GaN thin film deposited on an amorphous glass substrate was analyzed by using transmission electron microscopy with a new automated crystal orientation mapping tool. Film deposition was made at 600°C for 4 h by the hyperthermal neutral beam (HNB) source. Columnar crystals oriented to the [0001]direction without significant disordering were clearly observed. Electron diffraction patterns indicated that the crystals have mainly two different zone axes, [21 10] and [1010]. This crystallographic and microstructural information provides the guidance for future works for the HNB source to obtain GaN thin films of higher quality on amorphous substrates.
Yoo, Seung Jo,Lee, Ji-Hyun,Kim, Chang-Yeon,Kim, Chang Hoi,Shin, Jae Won,Kim, Hong Seung,Kim, Jin-Gyu Elsevier 2015 THIN SOLID FILMS - Vol.588 No.-
<P><B>Abstract</B></P> <P>We directly observed the crystal structure changes of the Mg<I> <SUB>x</SUB> </I>Zn<SUB> <I>1−x</I> </SUB>O alloy thin film deposited on Si (111) substrates. Through the in situ heating transmission electron microscopy study, it was determined that the crystal structure changes did not occur up to at 400°C, whereas the disappearance of the hexagonal structure was observed at 500°C in the layer of nanosized grains. Additionally, the decreased intensity of the Zn L-edge was analyzed in the comparison of the core loss electron energy loss spectroscopy spectra of the Zn L-edge and the Mg K-edge obtained at room temperature and 500°C. Based on these experimental results, the process of crystal structure changes could be explained by the evaporation of Zn atoms in the Mg<I> <SUB>x</SUB> </I>Zn<SUB> <I>1−x</I> </SUB>O alloy system. This phenomenon is prominent in the improvement of the microstructure of the Mg<I> <SUB>x</SUB> </I>Zn<SUB> <I>1−x</I> </SUB>O alloy thin film by controlling the thermal annealing temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mg<I> <SUB>x</SUB> </I>Zn<SUB> <I>1−x</I> </SUB>O thin films coexisting with cubic and hexagonal structures were deposited. </LI> <LI> Crystal structure changes of the thin films were directly observed at 500°C. </LI> <LI> The process of microstructure changes could be caused by the evaporation of Zn atoms. </LI> </UL> </P>
유승조(Seung Jo Yoo),송경식(Kyung Sik Song) 한국생약학회 1991 생약학회지 Vol.22 No.1
Heavy metals may cause trouble(s) in human body. For consideration of the safety of crude drugs cultivated in Korea, we selected some medicinal plants and soils from cultivated site and estimated their heavy metal contents by inductively coupled argon plasma spectrometry (ICAP). Among heavy metals tested, the highest level of Cu and Zn were shown in plants cultivated in Kyung Ki; the highest level of Fe in those in Youngnam and the highest level of Mg and Mn in those in Youngdong. The heavy metal contents were as low as to be permeasible at least for the medicinal plants we selected. There were no significant correlations between heavy metal contents of soils and cultivated medicinal plants.
유승조(Seung Jo Yoo),송경식(Kyung Shik Song),곽종환(Jong Hwan Kwak),한병훈(Byung Hoon Han),류재하(Jae Ha Ryu) 한국생약학회 1989 생약학회지 Vol.20 No.3
From the root of Rhamnella frangulioides(=Microrhamnus frangulioides), three compounds (Comp. I ; mp 140∼142°, Comp. II; mp 196°, Comp. III ; mp 136∼138°) were isolated by silica gel column chromatographic purification which were identified as β-sitosterol, chrysophanol, 1-methyl-2-carboxymethyl-3-methoxy-4, 8-dihydroxy anthraquinone, respectively, by spectral analysis.