Kinetics of Hydrogen Movement in Zinc

Jeong_Keun Lee 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.II

The diffusivity of hydrogen in pure zinc was determined by using hydrogen extraction with cylindrical specimens of 1 cm in diameter and 1 cm in length. The measured values of the diffusivity did not vary statistically with the purity of the zinc, which indicates that the grain boundary did not play an important role in the hydrogen evolution from zinc. The values of the diffusivity obtained in the temperature range from 50 to 300 $^\circ$C showed that the diffusivity depended exponentially on the temperature. The repeatability of the hydrogen extraction method at low temperatures was better than that at high temperatures. A combination of the measured value of the frequency factor, $D_0$, with Zenner's theoretical expression of $D_0$ for interstitial diffusion yielded a negative value of the activation entropy, $\Delta S$, which was explained by the hypothesis that the change in the vibrational frequency of hydrogen particles that jumped between adjacent sites contributed more to $\Delta S$ than the zinc lattice distortion caused by the movement of hydrogen particles did.

정상인에서 부분적 수면박탈이 수면구조에 미치는 영향

왕성근,이정규,이충숙,최하석,유남재,정인형,이선우 충남대학교 의과대학 지역사회의학연구소 1992 충남의대잡지 Vol.19 No.2

To identify the effects of partial sleep deprivation on the sleep structure, the authors performed polysomnographic study for 9 healthy young adults. The subjects were college students, ranging in age from 20 to 25 years, without personal past or present histories of medical, neurological, or psychiatric illness and suffering from current sleep disturbance or parasomomnias. Sleep records were analyzed according to the criteria of Rechtschaffen and Kales' manual and tried paired t-test. The results were summarized as follows. 1. As for sleep parameters, total sleep time(TST), REM latency and REM duration were not changed significantly during deprivation period and recovery period compared with baseline. Sleep efficiency increased significantly during deprivation period and recovery period compaired with baseline, and sleep latency and WASO were shortened significantly during deprivation period and recovery period compared with baseline. 2. As for sleep structure, 1) The absolute value(minutes) of stage 1 decreased significantly during deprivation period and first recovery night compared with baseline, and the relative value(percentage) of stage 1 decreased significantly during deprivation period and recovery period compared with baseline. 2) The absolute value(minutes) of stage 2 decreased significantly during deprivation period compared with baseline, and the relative value(percentage) of stage 2 decreased significantly during deprivation period and first recovery night compared with baseline. 3) The absolute value(minutes) of slow wave sleep were not changed significantly during deprivation period and recovery period compared with baseline, and the relative value(percentage) of slow wave sleep increased significantly during recovery period compared with baseline. 4) The absolute value(minutes) of REM sleep decreased significantly during deprivation period compared with baseline, and the relative value(percentage) of REM sleep decreased significantly in the first deprivation night but, were not changed significantly during recovery period compared with baseline.

추황배(Pyrus pyrifolia Nakai cv. Chuhwangbae) 과피로부터 1종의 Sterol과 3종의 배당체 화합물의 단리·동정

이유건(Yu Geon Lee1),조정용(Jeong-Yong Cho),이현주(Hyun Joo Lee),이용현(Yong Hyun Lee),이상현(Sang-Hyun Lee),한태호(Tae-Ho Han),김월수(Wol-Soo Kim),박근형(Keun-Hyung Park),문제학(Jae-Hak Moon) 한국식품과학회 2013 한국식품과학회지 Vol.45 No.5

본 연구에서는 배의 유용성 증명을 위한 일환으로 배의 화학성분을 분자수준에서 밝히고자 하였다. 이에 배 과피 MeOH 추출물을 용매분획하여 얻은 EtOAc-산성 분획과 EtOAc-중성분획을 대상으로 Sephadex LH-20, silica gel, 그리고 ODS colmn chromatography와 HPLC를 이용하여 정제 및 단리하였다. 그 결과, EtOAc-산성 분획과 EtOAc-중성 분획으로부터 각각 2종씩의 화합물을 단리하였다. 단리된 화합물 1-4는 1H- 및 13C-NMR 분석을 통하여 각각 (S)-(+)-2-cis-abscisic acid O-β-D-glucopyranosyl ester (화합물 1), 1-[4-O-β-D-glucopyranosyl]phenyl ethanone(piceoside, 화합물 2), β-sitosterol (화합물 3), 그리고 β-sitosteryl 3-O-β-D-glucopyranoside (화합물 4)로 동정되었다. 단리된 3종의 배당체 화합물(화합물 1, 2, 4)들은 본 연구에 의해 배로부터 처음 동정되었으며, 화합물 3은 추황배로부터 처음 동정되었다. 본 연구결과가 배 함유 성분연구는 물론 배의 기능성 해명 연구에도 추후 중요한 기초자료로 활용되길 기대한다. We isolated and identified antioxidants from acidic and neutral ethyl acetate fractions of the peel of pear (Pyrus pyrifolia N. cv. Chuhwangbae). We isolated 4 compounds from the methanol extract, by using 3 different types of column chromatography (Sephadex LH-20, silica gel, and octadecylsilane) and preparative HPLC. We identified the isolated compounds as (S)-(+)-2-cis-abscisic acid O-β-D-glucopyranosyl ester (compound 1), 1-[4-O-β-D-glucopyranosyl]phenyl ethanone (picroside, compound 2), β-sitosterol (compound 3), and β-sitosteryl 3-O-β-D-glucopyranoside (compound 4) by nuclear magnetic resonance analysis. We are the first to report the identification of compounds 1, 2, and 4 from pear.

지난 2년간의 학회지 "신경정신의학" 심사 평가보고

김찬형,김세주,김도관,김성곤,박원명,송동호,박용천,이영문,오강섭,정영철,이상열,김주한,이동영,이헌정,함병주,김율리,김문두,김정진,이강욱,천근아,김재진,홍진표,홍승철 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.6

원예치료프로그램(HTP)이 정신장애인의 자아상태, 대인관계 및 면역글로블린 IgG함량에 미치는 효과

정은경,이시래,서정근 한국식물인간환경학회 2000 인간식물환경학회지 Vol.3 No.3

The purpose of this study was to identify the effects of horticultural therapy on egostate, personal relationship and contents of immunoglobulin G in psychiatric patients. The experimental group was 16 patients, who received horticultural therapy for one hour per week for 15weeks. The control group was 16 patients, who did not received horticultural therapy. The data of subjects were collected before and after program of therapy at once for each. The result of the study were as follows: 1.The experimental group was decreased on critical patient egostate. 2.There was no significant difference on negativity to self and others of personal relationship in both groups. 3.The experimental group tended to be improved on contents of immunoglobulin G. Through above result, more concrete and scientific verification on the effects of horticultural therapy will be needed.

韓國自然部落 形態空間論 : 慶北 月城郡 江東面 良洞部落을 中心으로

李廷根 울산대학교 1978 연구논문집 Vol.9 No.2

慶北地方內 2個 部落을 選定해서 形態學的 接近法에 따라 部落의 建築環境을 그의 社會構造와 연관해서 분석해 보았다. The architectural environment of two Villages in Kyung Buk Prorince is Analysed through morphological approach. The study of form and pattern of the artificial spaces in relation to the social structure of their inhabitant's is the main theme of this notes.

골뱅이(Buccinum Undatum) 알레르기 : 감작률과 다른 음식물 항원과의 연관성 Sensitization rate and its relationship with other food allergens

이재영,윤성호,서유진,최정희,서창희,남동호,김윤근,민경업,박해심 대한천식 및 알레르기학회 2004 천식 및 알레르기 Vol.24 No.1

Background : The common whelk (Buccinum undatum) is one of the largest and most common snails in the North Atlantic. In Korea and Japan, common whelk is a popular eatable shellfish. Although shellfish has been known as the one of the most common causes of food allergy, there has been no published report on allergenecity and clinical significance of this sea snail. In this study, we determined the sensitization rate to common whelk and its relationship with other food allergens in allergy patients. Method : We carried out the skin prick test (SPT) with commonly consumed food stuffs in Korea including common whelk in 1700 patients over 1 year. The specific IgE to common whelk were detected by enzyme-linked immunosorbent assay (ELISA). ELISA inhibition test using sensitized sera was conducted. Results : SPT to common whelk was positive (≥2+) in 83 (4.9%) patients studied. Twenty-four (38.7%) of 62 SPT-positive patients had high serum specific IgE to common whelk. ELISA inhibition test showed significant inhibitions by abalone as well as by common whelk and, minimal inhibition were noted by shrimp. Significant correlation was also noted in specific IgE levels between common whelk and abalone (r=0.58, F<.05). Conclusion : IgE-sensitization rate to common whelk was 4.9% in allergy patients. Further stuides are needed to evaluate the clinical significance of sensitized patients to common whelk, and to confirm a cross reactivity with abalone. (J Asthma Allergy Immunol 24 : 77-84, 2004)

세라믹 재료의 연삭 특성에 관한 연구

정을섭,김성청,김태봉,소의열,이근상 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.3

In this study, experiments were carried out to investigate the characteristics of grinding and wear process of diamond wheel for ceramic materials. Normal component of grinding resistance of AL_2O_3 was less than that of Si_3N_4 and ZrO_2. This seems to be the characteristics of ceramic tools on work pieces both of high hardness. For the case of Si_3N_4 and ZrO_2 as the mesh number of wheel increases, the surface roughness decreases. For the case of Al_2O_3, the surface roughness does not decreases. Specific grinding energy decreases as the material removal rate per unit time increases. For the case of Si_3N_4 and ZrO_2, grinding is carried out by grain shedding process due to brittle fracture.

기성 콘크리트 파일 두부정리를 위한 자동화 장비의 개발

이정호,김정렬,김영석,조문영,김성근 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

During the last few years, the use of prefabricated concrete pile has been gradually increased in many construction sites. Cutting work of the concrete pile is an important task to crush a part of pile head which is compressed with more than 800㎏/㎠, It is usually performed by a crusher and three to four skilled workers. Recent analysis results of the pile cutting work reveal that it frequently makes a lot of cracks which significantly reduce the strength of the pile and is labor-intensive work. The primary objective of this study is to propose conceptual designs for developing an automated pile cutting machine. It is anticipated that the development of the automated pile cutting machine would be able to bring improvements in safety, productivity, quality as well as cost saving.

Al-Sn 합금의 마찰 특성에 미치는 Sn 형상의 영향

李定根,朱大憲,金文鉉,金明鎬 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.10

Effects of Sn morphology on the friction and wear characteristics of Al-Sn alloys were investigated by using the tribology tester, optical microscope and scanning electron microscope. Three different types of Sn morphologies named elongated, small network and large network structure were obtained by cladding and heat treatment. Wear resistance of the specimen having large network structure exhibited better anti-friction characteristics compare to that of the elongated structure. Also specific wear rate and friction coefficient decreased markedly with change of Sn morphology from elongated to large network structure. Abrasive and adhesive wear occurred for the elongated structure, while oxidation wear was observed for the network structure.