산업장의 소음환경에 관한 연구

최형일,박치홍,김종환 조선대학교 환경연구소 1994 環境公害硏究 Vol.11 No.-

This study investigated the noise level and distrbution of sound pressure level over audible frequency range of noise produced at various work sites. The results of the study were as follows 1. Of the total 84 work sites, 50 work sites (59.5%) produced noise exceeding threshold limit value (≥90㏈(A))set by the Ministry of Labor. 2. The frequence analysis of noise produced at the 14 work sites revealed that 7 work sites (50%) had the maximum sound pressure level at high-frequencies greater than 2㎑. 3. By the results of a question paper, 87% of the workers response there is too much noise, 48.6% of them response they appears a masking effect in work sites. 4. The noise induced hearing loss increased in numbers with duration of working.

RTA방법에 의한 Pd- 실리사이드의 쇼트키 장벽 높이에 관한 연구

崔致圭,李雲煥 제주대학교 1988 논문집 Vol.26 No.-

본 연구에서는 RTA방법에 의하여 Pd-Si계에서 우수한 Pd-Si가 형성됨을 확인하였으며 grain의 크기는 약150~200??으로 나타났다. AES스펙럼인 분석에 의하여 Ar 이온으로 sputtering하면서 얻은 Pd와 Si의 조성비는 41.5%와 58.5%로써 Pd- 실리사이드 상이 PdSi상에 거의 비슷함을 알 수 있었으며, 91eV에서 나타난 line shape는 미시구조를 나타내는 PdSi의 특성 피이크임을 보였다. 100~300K의 온도 영역에서 측정한 전류-전압특성곡선으로부터 SBH값은 0.32~0.75eV로 온도가 증가함에 따라 직선적으로 증하하였고 ideality factor n은 일반적인 값 1~2에 만족하였으며 고온영역에서는 거의 1에 근접함을 Tu 등이 실험한 값과 거의 일치됨을 보였다(Herman 1983, Tu, 1981) Si(111)면에서는 100~150K온도범위, Si(100)면에서는 100~200K 온도범위에서는 재결합 생성중심에 의한 전류흐름을 보여 열처리시 defect를 제거하는데 충분하지 못한다는 것을 알 수가 있었다. 다라서 RTA방법에 의한 실리사이드 형성시 실리콘 표면 영역에서 발생한는 defect를 제거하는 방법만 보완시키면 PdSi접촉을 이용하는 어떤 바이폴라 집적회로의 응용에도 가능하며 RTA는 장시간 열처리를 수반하는 전기로 열처리 방법보다 더 간편하고, 소자의 다른 특성을 변화시키지 않으므로 전이금속 실리사이드 형성에 우수한 장치로 평가된다. Formation of the palladium silicides was performed by the rapid thermal annealing using quartaz-halogen tungsten lamps. The Schottky-barrier heights of palladium silicides on both n-type(100)and(111)-oriented Si wafers have been measrued in the temperature range 100-300k with use of a current-voltoge thechnique. Silicide formation was monitored by glancing -angle X-ray diffraction and AES. The values of the barrier heights are 0.32-0.74eV for Si(111) and 0.34-0.75eV for Si(100) at temperaure in the range 100-300k. The barrier heights depend primarily on the metal deposited and not on the partivular silicide phase.

쇄골하 정맥 카테터 제거 후 발생한 일과성 피질맹

김지훈,이규환,한시령,최영빈,김영인 대한신경과학회 1999 대한신경과학회지 Vol.17 No.5

신라대학교 주변 백양산의 동물상

노치권(외 6명) 신라대학교 자연과학연구소 2012 自然科學論文集 Vol.22 No.-

To study fauna of Silla University located in Mt. Baek-yang, we conducted six surveys from 29 May 2011 to 28 April 2012. We found five phyla 41 orders 197 species of animals inhabiting in this area: four phyla 27 orders 163 species of invertebrates and in vertebrates one order six species of fishes, three orders nine species of amphibians and reptiles, six orders 14 species of aves, and four orders five species of mammals. Of these species, some Korean endemic species were included: a fish of Rhodeus uyekii in a pond near main gate of this university, a frog of Rana coreana in a creek near a dormitory, and a rabbit of Lepus coreanus and a water deer of Hydropotes inermis in a grass region near a main stadium. A kind of hawk, Falco tinnunculus as a natural monument (animal) of no. 323-8, was observed on a building of medical and life science. A blue frog of Hyla japonica as a variation was found near a spring resort. Therefore, this area is considered an ecologically important area having a high animal diversity.

단결정 Si(111) 위에 형성된 Ti-실리사이드에 대한 RBS 및 XRD 분석

이중환,권오준,최치규,박동수,김건호,이상환,이의완,곽호원 濟州大學校 基礎科學硏究所 1991 基礎科學硏究 Vol.4 No.1

초고진공 상태에서 p형 Si(111)기판에 Ti을 증착한 후 고진공에서 열처리하여 Ti-실리사이드를 형성시켰으며, Ti-실리사이드의 상전이 및 형성운동학은 2 MeV⁴He? 이온 후방산란과 x-선 회절방법으로 규명하였다. 형성된 TiSi₂는 결정학적으로 C49(ZrSi₂)와 C54 구조의 두 종류로 확인되었다. C49 TiSi₂상은 열처리온도가 700℃이하의 저온에서 형성되었고, 700℃ 이상의 고온에서는 C54 TiSi₂상으로 나타났다. 본 연구에서 확인된 C54 TiSi₂전이온도(??)는 700℃ 였고, TiSi₂형성온도 영역내에서 TiSi₂ 층두께(χ)와 열처리시간(t)의 관계는 저온(700℃ 이하)일 경우 ??이고, 고온(750℃ 이상)에서는 χ=ct+d 의 관계식이 만족됨을 알 수 있었다. 이것은 700℃ 이하에서 TiSi₂ 형성기구가 Si 확산에 의해 제어되며, 750℃ 이상에서는 핵형성 제어에 의하여 계면반응하는 것으로 나타났다. Titanium silicides were prepared by depositing titanium film on p-type Si(111) followed by annealing in ultra high vacuum. The growth kinetics of Ti-silicide has been studied by using ion backscattering spectrometry and x-ray diffractometry. Two crystallographic structures of Ti-silicide were identified the (ZrSi₂)structure and C54. The C49 TiSi₂ phase was formed at low annealing temperature(<700℃),and it transformed to the C54 phase over 700℃. The relation between the thickness of TiSi₂ layer(χ) and the annealing time(t) was ?? when annealing temperature was under 700℃ and χ=ct+d when that was over 750℃. The former implied that the formation of TiSi₂ was controlled by diffusion and the latter by nucleation of at the Ti/Si(111) interface.

한국 태권도선수들의 SCAT규준 개발

윤상화,지치환,최현정 龍仁大學校 武道硏究所 1998 武道硏究所誌 Vol.9 No.1

The purpose of this study was to examine difference on the level of sport competitive trait anxiety according to weight grades sex, level, school and to develop the SCAT norm for Korean Taekwondo players. The subjects for this study the study were selected as follows: total 431 subfects in 180 female platers, 251 male players, 248 high school and 183 university players. The results were as follows: 1) There is a high competitive anxiety in female players rather than male player. 2) There is a high competitive anxiety in high school players rather than university. 3) In result, the level of sport competitive trait anxiety has an effect on the sport ability of the Korean Taekwondo players. 4) There is a high competitive anxiety in light level weight pllayers rather than heavy level weight players. 5) The average score of SCAT in Korean Taekwondo platers was 21.71(3.40) in total, 21.55(2.91) in male players, 22.47(3.30) in high school platers, 21.49(3.51) in university players.

새로운 抗菌劑로서 1-(phenoxymethyl)benzotriazole 誘導體의 合成과 定量的 構造活性關係(QSAR) 分析

成洛道,林治煥,崔宇永,高東成,權奇星 충남대학교부설 생명공학연구소 1992 생물공학연구지 Vol.2 No.-

14종의 새로 합성된 1-(phenoxymethyl)benzotriazole(Ⅰ)(Y=0)과 1-(thiophenoxymethyl)benzotriazole (Ⅱ)(Y=S) 및 1-(azidomethy) benzotriazole(Ⅲ) 유도체의 구조와 in vitro에서 Pyricularia oryzae, Fusarium oxysporum f. sp. sesami, Valsa ceratosperma 및 Botrytis cinerea에 대한 균사 생장을 50% 저해하는 활성(pI_50)사이의 구조-항균활성 상관관계들을 QSAR방법으로 연구하였다. (Ⅰ)의 항균활성은 (Ⅱ)와 (Ⅲ)보다 우세하였으며 phenoxy group(Ⅰ)의 치환기 효과는 수소 결합성 (HB)과 포물선 관계의 electronic effect(σ), steric effect(B_1) 그리고 hydrophobic effect(π)로 설명된다. P. oryzae와 F. axysporum f. sp. sesami의 항균 활성에 대한 치환기의 적정값은 B_1=1.40A, (H)와 σ=0.07∼0.15, (H)이고 V. ceratosperma와 B. cinerea에 대하여는 각각 σ=0.23∼0.28, (C1)과 π=0.70, (C1)이었으며 가장 효과적인 화합물인 (Ia)와 (Id)의 구조-활성관계가 검토되었다 (1990년 5월 11일 접수, 1990년 9월 20일 수리). The structure-antifungal activity correlations between the structure of fourteen new 1-(phenoxymethyl)benzotriazoles (Ⅰ) (Y=0), 1-(thiophenoxymethyl)benzotriazoles (Ⅱ) (Y=S) and 1-(azidomethy)benzotriazole (Ⅲ) derivatives were synthesized, and their activity, fifty percent inhibition of mycelial growth(pI_50), in vitro against Pyricularia oryzae, Fusarium oxysporum f. sp sesami, Valsa ceratosperma and Botrytis cinerea were investigated using a generalized QSAR method. The activity of (Ⅰ) was superior to those of (Ⅱ) and (Ⅲ). The effect of the substituents (Ⅹ) on the phenoxy group (Ⅰ) was rationalized by a parabolic function of electronic (σ), steric (B_1) and hydrophobic parameter(π), and hydrogen bonding (HB). Where the optimal values of substituent on the fungicidal activity againt P. oryzae and F. axysporum f. sp. sesami are B_1=1.40A ; (H) and σ=0.07∼0.15;(H), and those of substituent on the fungicidal activity against V. ceratosperma and B. cinerea are σ=0.23∼0.28; (Cl), π=0.70; (C1), respectively. The most effective compound (Ⅰa) and (Ⅰd) were examined in this study.

산채류로부터 혈소판응집 억제물질의 검색

윤민호,임치환,오진환,이종철,최우영 충남대학교 농업과학연구소 1997 농업과학연구 Vol.24 No.2

To select potential inhibitors of platelet aggregation form large numbers of crude plant extracts, the modified thin smear method for the anti-platelet aggregating activity using platelet rich plasma was further modified by direct observation under a light microscope without staining the smear. The activities determined by the method were coincided with those by the electrical impedence method using whole blood, when ADP or collagen was employed as the aggregating agent. Among 130 varieties of edible and herbal plants which collected from markets or experimental farms of agricultural research institutes, those showed the anti-platelet aggregating activities were selected by testing the crude methanol extracts: Aster scaber, Aster tataricus, Ligularia stenocephala, Platycodon glaucum Allium victorials, Allium oderum, Morus bombycis, Portulaca oleracea, Acanthopanax sessiliflorus and Rosa davurica. However, some of them activated the platelet aggregation under the same assay conditions: Pimpinella brachycarpa, Hosta plantaginea. Capsella bursapastoris, Fagopym esculentum, Prunus mume, Rubus coreanus and Limaria japonica. In addition, those revealed the antioxidant activities were selected by measuring the abilities to scavenge superoxide anion radicals: Pteridum aquilinum, Aster scaber, Ligularia fischeri, Chrysanthemum zawadskii, Artemisia capipparis, Cirsium setidens, Commelina communis and Capsella bursapastoris among edible plants.

In situ 고상 에피택시 방법에 의한 CoSi₂/Si(111)구조의 형성

이정주,강민성,김현수,최치규,이운환,이종덕,이영백,김건호,이정용 濟州大學校 基礎科學硏究所 1996 基礎科學硏究 Vol.9 No.2

초고진공에서 공상에피택시(solid-phase epiyaxy, SPE) 방법으로 CoSi₂를 Si(111)기판 위에 에피택시 성장시켰다. 2MeV⁴He++ ion후방산란 분광기와 사중결정 x-선 회절기 및 고분해 투과전자 현미경을 이용하여 성장된 CoSi₂의 상과 조성, 결정성, 그리고 계면의 미시구조를 조사하였다. 초고진공상태의 실온에서 Si(111)-7X7기판에 Co를 약 20 ~50 ?? 중착한 후 SPE에 의하여 실리사이드를 형성시키는 경우 600℃에서는 B-형의 CoSi₂가, 그리고 700℃에서는 A형의 CoSi₂가 선택적으로 에피택시 성장하였으며, 정합성은 B-CoSi₂[110]//Si[110] and CoSi₂(111)//Si(111)이, 그리고 700℃에서는 A-CoSi₂[110]//Si[110], CoSi₂(002)//Si(002)을 나타내었다. Epitaxial films of CoSi₂were grown on Si(111) substrates by in situ solid-phase epitaxy in a ultrahigh vacuum. The phase, the chemical composition, the crystallinity, and the microstructure of the Silicide/Si interface were investigated by 2-MeV⁴He++ ion-backscattering spectrometry, quadruple crystal X-ray diffractometry, and high-resolution transmission eletron micorscopy. High-quality films of either B-type or A-type CoSi₂ could be grown selectively on Si(111) substrates by depositing ~ 20 ~ 50 ?? of Co on a Si(111)-7X7 substrate followed by in situ annealing at 600℃ or 700℃ for 10 min. The matching face relationships are CoSi₂[110]//Si[110] and CoSi₂(111)//Si(111) by B-type CoSi₂ and CoSi₂[110]//Si[110]//Si[110] and CoSi₂(002)//Si(002) for A-type CoSi₂.

Clinical predictive factors of pathologic tumor response after preoperative chemoradiotherapy in rectal cancer

Choi, Chi Hwan,Kim, Won Dong,Lee, Sang Jeon,Park, Woo-Yoon The Korean Society for Radiation Oncology 2012 Radiation Oncology Journal Vol.30 No.3

Purpose: The aim of this study was to identify clinical predictive factors for tumor response after preoperative chemoradiotherapy (CRT) in rectal cancer. Materials and Methods: The study involved 51 patients who underwent preoperative CRT followed by surgery between January 2005 and February 2012. Radiotherapy was delivered to the whole pelvis at a dose of 45 Gy in 25 fractions, followed by a boost of 5.4 Gy in 3 fractions to the primary tumor with 5 fractions per week. Three different chemotherapy regimens were used (5-fluorouracil and leucovorin, capecitabine, or tegafur/uracil). Tumor responses to preoperative CRT were assessed in terms of tumor downstaging and pathologic complete response (ypCR). Statistical analyses were performed to identify clinical factors associated with pathologic tumor response. Results: Tumor downstaging was observed in 28 patients (54.9%), whereas ypCR was observed in 6 patients (11.8%). Multivariate analysis found that predictors of downstaging was pretreatment relative lymphocyte count (p = 0.023) and that none of clinical factors was significantly associated with ypCR. Conclusion: Pretreatment relative lymphocyte count (%) has a significant impact on the pathologic tumor response (tumor downstaging) after preoperative CRT for locally advanced rectal cancer. Enhancement of lymphocyte-mediated immune reactions may improve the effect of preoperative CRT for rectal cancer.