나지(裸地)에서 벌개미취 생장에 미치는 재식거리의 영향

신세균,박재호,전종옥,윤태,윤종선 韓國植物ㆍ人間ㆍ環境學會 2001 인간식물환경학회지 Vol.4 No.3

The Primary goal of this research is to verify the usefulness of Aster Koraiensis as a garden plant and to figure out the appropriate planting space which would bring the most effective results in terms of scenery and cost. For these purpose, we gathered the saplings of the wild grown Aster koraiensis in August and maintained them for winter. The following spring, we planted them in flat bare land with 3 different panting spaces of 50 x 50Cm, 40x30Cm, 30x30Cm. 2nd years after planting, we observed and compared the 3 different columns on the status of growth, number and size of leaves and conditions of flowering. The results are as follows : The number of leaves, stalks and roots of individual plants were increased by the wider planting density. But the ratio of leaf area per unit area appeared to be the highest in the 40X30cm sector which showed 366.9%, while the 50x50cm column showed 294.1% and 360.4% in the 30X30cm column. As for the conditions of flowering, such as the size of flowers, the number of petals per blossom and the length of flowerstalks, the best results were observed in the 50x50cm column. On the other hand, the 40x30cm column yielded the largest number of blossoms per unit area. On the basis of these results, we could induce that the 30x30cm column had already passed the peak point for the best scenery within 2 years after planting, while the 50x50cm column had not yet reached the peak point. Naturally, this leads to the conclusion that the 40x40cm planting space could be most effective when we assume the peak period for scenery to be 2nd years after planting. According to our investigation, the blooming period of Aster Koraiensis in the central region of the Korean peninsular lasts about 70 days from 15th June to 25th August. And the peak blooming time is 30 days from 5th July to 5th August. On the basis of these findings, we can reach the final conclusion that Aster Koraiensis has many merits and is useful as ornamental flavor of garden.

Proton Irradiation and Hydrogen Diusion in Quasicrystals

Jae-Kyun Jeon,Jeonggil Lee,Euikwoun Kim,Yun-Man Lee,Sang-Hwa Lee,신혜민,Soo-Bin Choi,Sang-Pil Youn,Kyeryung Kim,Jae-Yong Kim 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.5

Ti-Zr-Ni quasicrystals are new candidates for hydrogen storage applications due to their capabil- ity of loading a large amount of hydrogen at reasonable temperature and hydrogen pressure. The technical applications, however, have been limited because of the presence of a thick oxygen layer, which must be eliminated prior to introducing hydrogen into a sample. To effectively remove the oxygen barrier and to enhance the capability of hydrogen absorption, we irradiated Ti39.5Zr39.5Ni21 quasicrystal ingots by using a proton beam at energy of 20 MeV, 15 mA for 30 minutes. The proton-beam-treated samples were exposed to a hydrogen pressure of 650 psi at 200℃ and the results were analyzed by monitoring the pressure change of the chamber. The main concerns were a careful measurement of the weight gain after hydrogenation and an estimate of the peak shifts in X-ray diffraction. An absorption of hydrogen was observed for the proton-beam-irradiated samples while little hydrogen loading was noticed for unirradiated ones. Our results demonstrate that proton irradiation may be used as a new technique that can effectively eliminate the oxygen barrier and enhance the rates of hydrogen diffusion. However, more systematic investigations regarding the role of the proton are required before applying the technique for practical applications. Ti-Zr-Ni quasicrystals are new candidates for hydrogen storage applications due to their capabil- ity of loading a large amount of hydrogen at reasonable temperature and hydrogen pressure. The technical applications, however, have been limited because of the presence of a thick oxygen layer, which must be eliminated prior to introducing hydrogen into a sample. To effectively remove the oxygen barrier and to enhance the capability of hydrogen absorption, we irradiated Ti39.5Zr39.5Ni21 quasicrystal ingots by using a proton beam at energy of 20 MeV, 15 mA for 30 minutes. The proton-beam-treated samples were exposed to a hydrogen pressure of 650 psi at 200℃ and the results were analyzed by monitoring the pressure change of the chamber. The main concerns were a careful measurement of the weight gain after hydrogenation and an estimate of the peak shifts in X-ray diffraction. An absorption of hydrogen was observed for the proton-beam-irradiated samples while little hydrogen loading was noticed for unirradiated ones. Our results demonstrate that proton irradiation may be used as a new technique that can effectively eliminate the oxygen barrier and enhance the rates of hydrogen diffusion. However, more systematic investigations regarding the role of the proton are required before applying the technique for practical applications.

Comparative analysis of The Isokinetic Muscular Function of Knee joint of Female National Alphine skiers before and after Season

Jeon, Yong-Kyun(전용균),Lee, Ki-Hong(이기홍),Kim, Jae-Ho(김재호),Lee, Seung-Bum(이승범) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.3

이 연구는 국내 우수 여자 국가대표 알파인 스키선수 선수들을 대상으로 시즌 전, 후 무릎관절의 근기능을 비교 분석하여 선수들의 시즌 전과 후의 체력특성을 규명하는 연구로서 알파인 선수들의 경기력 증진 및 근기능 체력보강 훈련에 적용할 자료를 제공하고자 시도 하였다. 이 연구의 대상은 현재 2010년 대한스키협회에 등록되어있는 국가대표 알파인 스키 여자선수 8명을 대상으로 실행하였으며, 무릎관절 근기능을 알아보기 위해 등속성 근기능 측정기기인 Cybex HUMAC NORM을 이용하였다. 각 측정변인의 측정결과는 다음과 같은 결과를 얻었다. 첫째, 무릎관절의 최대근력과 체중당 최대근력은 시즌 전이 크게 나타났으며 최대근력 오른쪽, 왼쪽 최대 신근력과 굴근력에서 통계적으로 유의한 차이를 보였다(p<.01) (p<.01) (p<.01) (p<.01). 둘째,. 무릎관절의 평균파워와 체중당 평균파워는 시즌 전이 크게 나타났으나 통계적으로 유의한 차이는 나타내지 않았다. 셋째, 무릎관절의 근지구력비 검사 시 시즌 후가 더 크게 나타났으며 오른쪽, 왼쪽 굴근력과 신근력에서 통계적으로 유의한 차이가 나타났다(p<.01) (p<.05) (p<.01) (p<.05). 이러한 결과들을 종합할 때 여자 국가대표 알파인 스키선수들의 시즌 전ㆍ후 측정 시에 무릎관절의 근력은 시즌전이 통계적으로 좋은 것을 알 수 있었다. 이는 알파인 스키선수들의 경기력향상을 위해서는 시즌 초반부터 후반까지 선수들의 체력을 유지, 발달시키는 것이 무엇보다 우선시 되어야 하며 이를 위해서는 설상훈련과 더불어 지속적인 체력트레이닝이 필요함을 시사한다.

Microsatellite Instability in Coloretal Cancer

Jeon, Hae Myung,Yoo, Seung Jin,Kim, Nam Il,Kim, Jeong Soo,Chang, Suk Kyun,Kim, Jae Sung CATHOLIC MEDICAL CENTER 1996 Bulletin of the Clinical Research Institute Vol.21 No.1

Microsatellites are short nucleotide repeat sequences present throughout the human genome. Alterations of microsatellites, comprising extra or missing copies of these sequences, have been termed microsatellite instability(genetic instability, replication errors, RER(+) phenotype). Spontaneous errors in DNA replication have been suggested to play a significant role in neo-plastic transformation and to explain the chromosomal alteration seen in cancer cell. We have studied six di , tri or tetranucleotide repeat loci, located on six different chromosomes by use of polymerase chain reaction amplification and denaturing polyacrylamide gel electrophoresis. We found that 9 of 46 (19.6%) sporadic colorectal cancers showed RER at two or several loci (RER(+)). Microsatellite instability was significantly associated with location of the tumor in the proximal colon (67%) and with poorly differentiated tumor phenotype(56%). These clinicopathological features in microsatellite instability of the colorectal cancer strongly similar to tumor from patients with HNPCC(Hereditary Non Polyposis Colorectal Cancer). These data in heritable HNPCC gene and microsatellite instability is closely associated to neoplastic transformation.

Correlation between Serum ferritin and colorectal adenoma in average risk Korean (초)

( Jae Woong Lee ),( Jung Ho Park ),( Hong Joo Kim ),( Yong Kyun Cho ),( Chong Il Sohn ),( Woo Kyu Jeon ),( Byung Ik Kim ),( Dong Ii Park ) 대한내과학회 2008 대한내과학회 추계학술대회 Vol.2008 No.-

Correlation between Serum ferritin and colorectal adenoma in average risk Korean (초)

( Jae Woong Lee ),( Jung Ho Park ),( Hong Joo Kim ),( Yong Kyun Cho ),( Chong Il Sohn ),( Woo Kyu Jeon ),( Byung Ik Kim ),( Dong II Park ) 대한내과학회 2008 대한내과학회지 Vol.75 No.1S

Exposure to Diagnostic Radiation in Patients with Inflammatory Bowel Disease: A Single Center Study

( Jae Wan Lim ),( Yoon Suk Jung ),( Jung Ho Park ),( Hong Joo Kim ),( Yong Kyun Cho ),( Chong Il Sohn ),( Woo Kyu Jeon ),( Byung Ik Kim ),( Dong Il Park ) 대한장연구학회 2013 Intestinal Research Vol.11 No.2

Background/Aims: Western studies recently reported that patients with inflammatory bowel disease (IBD) are exposed to diagnostic radiation at potentially harmful levels. There is little research, however, on exposure to diagnostic radiation in patients with IBD in Asian areas. The present study assessed cumulative radiation exposure dose in patients with IBD who were treated at a single-tertiary medical center in Korea and analyzed the factors that increased the exposure dose. Methods: Retrospective investigation was performed of the medical records of the patients who were followed up for 1 year or more in a period from January 2003 through November 2011 at Kangbuk Samsung Hospital. Results: Included in the study were 202 patients with IBD: 80 (39.6%) had Crohn`s disease (CD) and 122 (60.4%) had ulcerative colitis (UC). The mean follow-up period was 4.2±2.5 years for CD and 4.3±1.4 years for UC. The mean culmulative effective dose (CED) for CD and UC were 39.7 and 11.0 mSv respectively (P<0.001). In CD, factors associated with increased CED were surgery, history of intravenous steroid treatment, and structuring or penetrating disease. Conclusions: A substantial proportion of IBD patients, especially CD patients, were exposed to significantly harmful amounts of diagnostic radiation, mainly due to computed tomography examination. Efforts should be made to reduced diagnostic medical radiation, especially in patients at risk for increased radiation exposure. (Intest Res 2013;11:107-112)

Original Articles : Evaluation of an Experimentally Designed Stereotactic Guidance System for Determining Needle Entry Point during Uniplanar Fluoroscopy-guided Intervention

( Jae Heon Lee ),( Gye Rok Jeon ),( Jung Hoon Ro ),( Gyeong Jo Byoen ),( Tae Kyun Kim ),( Kyung Hoon Kim ) 대한통증학회 2012 The Korean Journal of Pain Vol.25 No.2

Background: In discography performed during percutaneous endoscopic lumbar discectomy (PELD) via the posterolateral approach, it is difficult to create a fluoroscopic tunnel view because a long needle is required for discography and the guide-wire used for consecutive PELD interrupts rotation of fluoroscope. A stereotactic system was designed to facilitate the determination of the needle entry point, and the feasibility of this system was evaluated during interventional spine procedures. Methods: A newly designed stereotactic guidance system underwent a field test application for PELD. Sixty patients who underwent single-level PELD at L4-L5 were randomly divided into conventional or stereotactic groups. PELD was performed via the posterolateral approach using the entry point on the skin determined by premeasured distance from the midline and angles according to preoperative magnetic resonance imaging (MRI) findings. Needle entry accuracy provided by the two groups was determined by comparing the distance and angle measured by postoperative computed tomography with those measured by preoperative MRI. The duration and radiation exposure for determining the entry point were measured in the groups. Results: The new stereotactic guidance system and the conventional method provided similarly accurate entry points for discography and consecutive PELD. However, the new stereotactic guidance system lowered the duration and radiation exposure for determining the entry point. Conclusions: The new stereotactic guidance system under fluoroscopy provided a reliable needle entry point for discography and consecutive PELD. Furthermore, it reduced the duration and radiation exposure associated with determining needle entry. (Korean J Pain 2012; 25: 81-88)

Serum uric acid as predictor for development of non-alcoholic fatty Liver disease(NAFLD)

Jae Woong Lee,Yong Kyun Cho,Jung Ho Park,Hong Joo Kim,Dong Il Park,Chong Il Sohn,Woo Kyu Jeon,Byung Ik Kim,Ki Chul Sung 대한내과학회 2009 대한내과학회 추계학술대회 Vol.2009 No.-

Functional Analysis of Endoplasmic Reticulum Transmembrane Protein Kinase Ire1 as a Signaling Component of Unfolded Protein Response in Arabidopsis

Jae Yong Yoo,In Jung Jung,Jeong Chan Moon,Joo Mi Jeon,Wahyu Indra Fanata,Bo Hwa Son,Jae Ho Cha,Je Hein Kim,Rikno Harmoko,Ki Seong Ko,Sang Yeol Lee,Kyun Oh Lee 한국당과학회 2009 한국당과학회 학술대회 Vol.2009 No.1

Accumulation of unfolded proteins in the lumen of endoplasmic reticulum (ER) induces ER stress and activates signaling pathway called unfolded protein response (UPR) for relief of ER stress. In yeast and mammalian cells, an ER-located transmembrane receptor protein kinase/ribonuclease called Ire1 transmits the signal to the nucleus culminating in the transcriptional activation of genes encoding an adaptive response. Plants including Arabidopsis are also containing homologous genes. However, it has been unclear whether the homologous genes are involved in similar mechanism in plants. Arabidopsis ire1 mutant did not show different phenotype compared to WT in normal and stress conditions. However, induction of ER chaperone genes including Bip3 were significantly delayed in ire1 compared to WT. To further investigate the role of AtIre1 in plant UPR signaling, we overexpressed AtIre1 under the control of CaMV 35S promoter. The result indicate that AtIre1 is possibly involved in UPR signaling in plants. [Supported by EB-NCRC & BK21 program]