Ni-Cr-Mo-V鋼의 마르텐사이트 燒戾胞性에 미치는 溶體化處理의 영향

徐雨澤,趙完錫,趙顯麒 慶北大學校 産業開發硏究所 1985 硏究報告 Vol.13 No.-

The effect of solution treatment temperature on the tempered martensite embrittlement in 2.5% Ni-1% Cr-0.4% Mo-0.12% V steel has been investigated. Tempered martensite embrittlement occurs at 350℃ tempering. With increasing solution treatment temperature from 850℃ to 1,150℃, Charpy impact energy shows a maximum at 900℃ and decreases above/below 900℃. This seems to be attributed to the microsegregation of solute atoms below 900℃ and the growth of austenite grains above 900℃. The failure mode is primarily a cleavage fracture at the tempered martensite embrittlement temperature. With increasing solution treatment temperature, the amount of cleavage and the ductile to brittle transition temperature increase.

콘크리트의 壓縮强度에 미치는 굵은 골재 크기의 영향에 관한 基礎的 硏究

윤석천,박서규,남재현,김무한 충남대학교 공업교육연구소 1985 論文集 Vol.8 No.1

The purpose of this study is to research an effect of aggregate size on the compressive strength of concrete. Tests were, therefore, made in sixteen classes of concrete : maximum aggregate sizes of 5, 10, 20, 30^mm with water cement rations of 40% and 60% and with AEA°cement rations of 0.00% and 0.03% for each maximum aggregate size. The results of this experiment are showing the fellowing tendency. 1. Generally, with the range of this experiment program, the smaller maximum aggregate size becomes, the higher the compressive strength of concrete gets. 2. The decreasing tate of the compressive strength of concrete gets higher in lean mix concrete than in rich mix concrete at each age. 3. The compressive strength of concrete is developed faster with not only the increase of maximum aggregate size but also the decrease of water cement ratio. And it shows that the rate of the compressive strength development is higher in AE concrete in spite of water cement ratio.

전파조정기를 이용한 마이크로파 소자용 Calibration

석은영,조현광,서영석,한교용 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.1

A microwave device measurement tool kit using the TRL method for microwave tuner was developed. Teflon substrate was used for easy manufacturing. An adapter from CDI was used for the junction transition between microstrip and coaxial line. Mask production procedure which have the 3:1 reduction ratio was developed for microstrip transmission line manufacturing. Using these procedure the Cal Kit which can have Thru, Reflect, and Line was manufactured. TRL error correction method can be applied to the Kit. We tested the Cal kit and the error due to the microstrip line could be corrected. It can be applicable to the accurate measurement of microwave transistors.

154kV용 활선 안전 경보기 개발에 관한 연구

정민규,조현광,우종수,안창회,서영석,김응태,박창기,오세득 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.1

In this report we developed a high voltage alarm for the safety of workers who check and repair the 154kV power line. This high voltage alarm we developed is attached on workers' helmet and alarms automatically in order to let workers know when workers work over the safety distance near 154kV power line. Until now the exact safety distance hasn't been regulated and high voltage alarm we've been using was for the range of 6∼22.9kV power line. We fabricated this high voltage alarm on the basis of electric density and actual measurement of power line. The experimental result was that high voltage alarm at 66kV power line alarmed near 90cm, at 154kV power line alarmed near 160cm from the line. Accordingly, we developed the new high voltage alarm which is operated in the range of 66∼154kV power line.

Original Article : No association between the IL28B SNP and response to peginterferon plus ribavirin combination treatment in Korean chronic hepatitis C patients

( Nae Yun Heo ),( Young Suk Lim ),( Woochang Lee ),( Minkyung Oh ),( Jiyun An ),( Dan Bi Lee ),( Ju Hyun Shim ),( Kang Mo Kim ),( Han Chu Lee ),( Yung Sang Lee ),( Dong Jin Suh2 ) 대한간학회 2014 Clinical and Molecular Hepatology(대한간학회지) Vol.20 No.2

Background/Aims: There are few available data regarding the association between the single nucleotide polymorphisms (SNPs) of the gene encoding interleukin 28B (IL28B) and a sustained virologic response (SVR) to peginterferon (PEG-IFN) plus ribavirin (RBV) therapy in Korean chronic hepatitis C patients. Methods: This was a retrospective cohort study of 156 patients with chronic hepatitis C virus (HCV) infection who received combination treatment of PEG-IFN plus RBV. Blood samples from these patients were analyzed to identify the IL28B SNPs at rs12979860, rs12980275, rs8099917, and rs8103142. Association analyses were performed to evaluate the relationships between each IL28B SNP and SVRs. Results: Seventy six patients with HCV genotype 1 and 80 with genotype non-1 were enrolled. The frequencies of rs12979860 CC and CT genotypes were 90.4% and 9.6%, respectively; those of rs12980275 AA and AG genotypes were 87.2% and 12.8%, respectively; those of rs8099917 TT and TG genotypes were 92.3% and 7.7%, respectively; and those of rs8103142 TT and CT genotypes were 90.4% and 9.6%, respectively. Among the patients with HCV genotype 1, the SVR rates were 69.7% and 80.0% for rs12979860 CC and CT, respectively (P=0.71). Among the HCV genotype non-1 patients, SVR rates were 88.0% and 100% for rs12979860 CC and CT (P=1.00), respectively. Conclusions: Genotypes of the IL28B SNP that are known to be favorable were present in most of the Korean patients with chronic hepatitis C in this study. Moreover, the IL28B SNP did not influence the SVR rate in either the HCV genotype 1 or non-1 patients. Therefore, IL28B SNP analysis might be not useful for the initial assessment, prediction of treatment outcomes, or treatment decision-making of Korean chronic hepatitis C patients. (Clin Mol Hepatol 2014;20:177-184)

내시경적 점막절제술로 치험한 식도 과립상 세포종 1례

강혁주,김성욱,최석진,이중현,장재식,서영범,윤병구,박건욱,김성자,김용섭,강승완,이구,양창헌,이창우,김욱년,이광헌,서정일 동국대학교 의학연구소 2000 東國醫學 Vol.7 No.-

과립상 세포종은 Schwann 세포 기원으로 생각되며 인체에 비교적 드물게 발생한다. 과립상 세포종은 전신 어느 곳에서나 발견될 수 있으나 주로 혀, 구강, 피부 혹은 유방 등에서 호발하며 드물게 위장관에서 발견된다. 위장관에서는 식도에서 가장 호발하며 다음으로 위, 대장 순이다. 과립상 세포종은 대부분, 특히 위장관에서는 양성이며 소수의 악성 병변이 보고되었다. 이러한 이유와 함께 수술 전의 진단이 어렵기 때문에 과립상 세포종에 대한 근본적인 치료는 현재까지 외과적 절제술이다. 최근에 시도되는 치료방법들로는 내시경적 레이저 치료, 용종절제술, 내시경적 점막 절제술 등이 있다. 저자들은 상부 소화관 내시경검사를 시행하여 식도 과립상 세포종을 진단하고 내시경적 점막 절제술을 시행하여 합병증 없이 퇴원하여 현재 재발없이 경과 관찰중인 1례를 경험하였기에 보고하는 바이다. Granular cell tumors, which occur infrequently, are probably of Schwann cell origin. They can occur almost anywhere in the body but usually affect the tongue, oral cavity, skin, or breasts and are rarely found in the gastrointestinal tracts. The esophagus is the most frequent gastrointestinal site, followed by the stomach and the colon. Granular cell tumors are generally benign, especially in the gastrointestinal tract, some malignant lesions have been reported. For this reason, and also because preoperative diagnosis is difficult, the standard treatment for granular cell tumor has until now been surgical excision. In recent years, other therapeutic methods is endoscopic laser therapy (ELT), polypectiomy, endoscopic mucosal resection (EMR). We report a case of esophageal granular cell tumor which was diagnosed by an endoscopy and managed using an endoscopic mucosal resection without complication.

n-CdS_(0.46)Se_(0.54)/p-Cu_92-x)S_(0.46)Se_(0.54) 이종접합 태양전지의 제작과 그 특성에 관한 연구

유상하,최승평,이상열,홍광준,서상석,김혜숙,전승룡,윤은희,문종대,신영진,정태수,신현길,김택성,유기수 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.16 No.-

승화방법에 의해 CdS_0.46Se_0.54 단결정을 성장하여 결정구조를 조사하고, Van der Pauw 방법으로 Hall effect를 측정하여 carrier density의 온도 의존성과 mobility의 온도 의존성을 조사하였다. 성장된 CdS_0.46Se_0.54 단결정을 치환반응하여 n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 이종접합 태양전지를 제작하였다. Spectral response, 전류-전압특성 및 전력변환 효율을 조사하여 그 결과로부터 개방전압은 0.48V, 단락 전류 밀도는 21mA/㎠, fill factor와 전력변환효율은 각각 0.75와 9.5%를 얻었다. CdS_0.46Se_0.54 single crystal was grown by a sublimation method. The crystal structure and the temperature dependence of carrier density and mobility of CdS_0.46Se_0.54 single crystal were studied. Heterojunction solar cells on n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 were fabricated by the substitution reaction. The spectral response, the J-U characteristics and the conversion efficiency of the n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells were studied. The open-cricuit voltage, short-circuit density, fill factor and conversion efficiency of n-CdS_0.46Se_0.54/p-Cu_2-xS_0.46Se_0.54 heterojunction solar cells under 80mW/㎠ illumination were found to be 0.48V, 21mA/㎠, 0.75 and 9.5%, respectively.

종합검진센터 내원자에서 관상동맥질환 위험요인들의 분포

이충원,이종영,박종원,윤능기,김영조,이현우,이무식,서석권 啓明大學校 醫科大學 1993 계명의대학술지 Vol.12 No.3

1991년3월부터 8월사이에 대구시에 소재한 1개의 대학병원의 종합검진센타에 내원해서 종합검진을 받은 남자 422명(69.9%)과 여자 182명(30.1%)을 대상으로 하여 심헐관계질환의 위험요인들의 전체적인 분포를 보았다. 평균 연령은 남자가 43.3(표준편차, 10.3), 여자가 44.4(표준편차, 10.8)였다. 남자에서 연령에 따라 0.05 수준에서 통계적인 유의성을 보인 위험인자는 혈청 총콜레스테롤(TC). 트리글리세라이드(TC), 고밀도 지단백콜레스테롤(HDL), 저밀도 지단백콜레스테롤(LDL), 수축기혈압, 비체중, A형행동양상이었으며 생활습관으로서는 음주, 흡연, 규칙적인 운동, 우유와 커피섭취, 수면 등이었다. 여자에서는 TC, TG, LDL, 수축기와 확장기혈압, 비체중 그리고 커피섭취와 수면 등이었다. 남자에서 총콜레스테롤의 평균은 181.7mg/dl(표준편차, 32.2), 여자는 182.5mg/이(표준편차, 42.2)였다. 대부분의 위험인자들은 구미의 수준에 미치지 못했으나 남자에서 흡연율이 전체적으로 61.8%로 높으 수준이었으며 특히, 20~29세가 72.9%, 30~39세가 75.2%로서 다른 연령군에 비해 상대적으로 높았다. 여자에서는 전체적으로 6.0%에 지나지 않았다. 확장기혈압 90mmHg 이상을 고혈압자로 정의했을 때의 유병률이 여자 전체대상자에서 24.7%로 높았으며 50-59세는 표본수가 적어서 문제가 되었으나 53.1%였다. 어떤 인구집단내에서 총콜레스테롤의 평균이 200mg/dl 미만이면 고혈압과 흡연의 인구집단의 수준에 관계없이 관상동맥질환(coronary heart disease)의 발생은 드문 것으로 보고가 되고 있으므로 당분간 관상동맥질환 발생률의 급속한 절대적인 증가는 힘드리라 사료된다. 그러나 이러한 결과는 본 연구의 대상자들이 대표성을 지니지 못하며 건강검진센터에 자발적으로 내원한 사람들이므로 해석에 주의를 요한다. Authors examined the distributions of the risk factors for the coronary heart disease in the 422 male (69.9%) and 182 female (30.1%) visitors to the health examination center of a university hospital located in Taegu March to August 1991. Mean age of males was 43.3(standard deviation, SD 10.3) and that of females was 44.4(SD 10.8). Total cholesterol(TC), triglyceride (TG), high-density lipoprotein and low-density lipoprotein cholesterol(LDL), systolic blood pressure, Quetelet index, and Type A Behavior Pattern, and some of life habit variables(alcohol intake, smoking, regular exercise, milk and coffee intake and sleeping) were statistically significant in age groups of the males(P<0.05). In the females, TC, TG and LDL, systolic and diastolic pressure, Quetelet index, coffee intake and sleeping were statistically significant in age groups (P<0.05). Mean of total cholesterol was 181.7㎎/dl(SD,32.2) in males and that of females was 182.5㎎/dl(SD,42.2). Most of the risk factors levels were lower than the Euro-Americans', while smokers were high with 61.8%, especially 72.9% in 20-29 age group and 75.2% in 30-39 age group in males. In females, smokers were just 6.0%. Hypertensives defined by more than 90mmHg diastolic pressure were 24.7% in females, particularly 53.1% in 50-59 age group, but size of the strata was rather small(N=49). In the light of the report that coronary heart disease is uncommon irrespective of population levels of smoking and hypertension, where average total blood cholesterol level in a population is low(<200mg/dl), it is not likely that the absolute increase of the number of the coronary heart disease will increase markedly in the near future. But cautions should be exercised in interpreting the results of this study due to the lack of representativeness and volunteerism. .

Transactions : The Influence of Fashion Consumers` Perceived Risk and Regret-Solution Effort upon the Post-Purchase Intention -Focus on the Different Impulse Buying Types-

( Hyun Suk Suh ),( Youn Kue Na ),( Mi Hee Kim ) 한국의류학회 2010 한국의류학회지 Vol.34 No.6

The Effects of Mental Stress and Physical Risk Conditions to Physical Problems on e-Office Workers

Hyun-Suk Suh(서현석),Qiong Min 중앙대학교 한국전자무역연구소 2016 전자무역연구 Vol.14 No.4

연구목적: 본 연구는 컴퓨터와 인터넷을 주로 사용하는 e오피스(e-Office) 작업 현장에서 심리적 스트레스와 지각이 사무직원의 신체적 불편감에 어떠한 영향을 미치는지살펴보았다. 이를 위해 직장내 지각 5개 문항을 새롭게 개발하였고, 미국 국립 직업안전 위생연구소(NIOSH)에서 개발된 16개 문항의 신체적 불편감 척도와 11개 문항의 심리적 스트레스 척도를 본 연구에 적용했다. 논문구성/논리: 본 연구의 샘플은 2개의 대형 국내 컴퓨터회사에서 근무하고 주요업무가 컴퓨터와 관련된 일을 하며 20대에서 40대 사이 연령에 해당되는 222명의 사무직원을 대상으로 테스트되었다. 그리고 손과 팔의 불편감, 상반신 불편감, 일반적 불편감, 시각적 불편감 등 4개 영역의 근육불편감에 대해 다중회귀분석을 실시했다. 결과: 분석결과, 손과 팔의 불편감, 상반신 불편감, 그리고 일반적 불편감 모두가 직잗의 물리적 위험요소에 의해 유의하게 반응하는 것으로 나타났고, 심리적 스트레스에는 부분적으로 유의성이 나타났다. 남녀 직장인 차이에 있어서 여자가 남자보다 손과 팔의 불편감, 그리고 상반신 불편감에 있어 더 유의적인 결과로 나타났다. 한편, 서로 다른 연령층의 비요에 있어서도 가장 어린 나이군인 29살에서 31살의 직장인들은 더나이가 많은 그룹보다 손과 팔의 불편감과 일반적 불편감에 더 유의적으로 반응하는것으로 나타났다. 이는 이들이 직장에서 상대적으로 나이가 많은 그룹보다 정신적 육체적으로 더 힘든 작업환경에 노출된 것으로 유추해볼 수 있다. 독창성/가치: 본 연구의 독창적 가치는 물리적 작업환경에서의 위험요소의 척도를 새롭게 개발했으며, 이를 심리적 스트레스 증상과 함께 컴퓨터와 인터넷 사용을 주로 하는 e오피스 사무직원들의 물리적 신체적 증상에 적용했다. 위계적 회귀분석 결과, 물리적 위험요소와 심리적 스트레스 모두 최소 부분적 혹은 이상으로 작업자의 여러 육체적 불편감에 유의한 결과를 미치는 것으로 나타났다. Purpose: This study examines how the measures of physical risk conditions and mental stress for e-office workers who extensively use computers and the Internet influence their physical discomfort. To explore the idea, 11-items mental stress measures are developed and applied on US NIOSH(National Institute for Occupational Safety and Health) developed 16-item physical discomfort measures. Composition/Logic: Sample population from two large domestic computer companies, a total of 222 valid participants whose job tasks are primarily working with computers, and in ages between 20s and 40s were chosen and tested. The multiple regression analyses are conducted on four(4) different areas of muscle discomforts: hands and arms, upper body, general, and visual discomfort. Findings: The results indicated that the hands and arms, upper body, general, and visual discomfort all indicated significant physical risks, while all indicated partial significance for psychological risks. Regarding gender differences, female workers reported more problems with the hands and arms and upper body areas. Finally, workers in the youngest age group, or between 29 and 31, report relatively more problems in the upper body and general discomfort. It is inferred that this result is due to these age groups’ increased exposure to more demanding job tasks compared to other older age groups. Originality/Value: This study contributes by developing new measures for physical risk conditions. These and mental stress measures were applied to the physical symptoms of office workers who extensively use computers and the Internet. The results indicated that mental stress factors and physical risk conditions appear to be solid predictors of physical problems.