실리카흄을 흔입한 고강도 콘크리트 개발

홍창우,김태경,김경진,김성환,김남윤,심도식,이정호,윤청호,백민경,원치문,박제선,이주형,정경일 강원대학교 석재복합신소재제품연구센터 1996 석재연 논문집 Vol.1 No.-

콘크리트 구조물이 대형화됨에 따라 설계단면이 증대되어 상대적으로 많은 경제적 손실을 부담하게 된다. 따라서 단면을 감소시키면서도 소요의 하중에 안전한 구조물을 건설하기 위해서는 우선적으로 구조물 건설에 기초가 되는 고품질, 고내구성의 고강도 콘크리트 개발이 절실히 요구된다 본 연구에서는 일정 시멘트비 및 혼화재 비율하에서 소요의 워커빌리티가 확보되는 고강도 콘크리트를 시간과 온도의 변화에 따라 증기 양생하여, 압축, 인장, 휨강도 뿐만 아니라 파괴특성을 실험적으로 연구하였다. 시료 제작시 시멘트 입자 사이의 공극 및 불연속 영역을 충전하여 고밀도화하기 위한 콘크리트용 혼화재로 시멘트 비표면적이 상당히 작은 초미립 분말인 실리카흄을 이용하였다. 또한 AE감수제 및 고성능 유동화제를 사용하여 혼화재의 첨가에 의하여 발생될 수 있는 워커빌리티의 감소를 방지하였다. 실험결과에 의하면 일정 양생 지속 시간하에서 온도의 증가에 따라 콘크리트의 압축, 인장 및 휨강도가 전반적으로 증가하였다. 동일하게 일정 온도하에서 양생 지속시간이 커짐에 따라 강도들이 증가됨을 알 수 있었다. 따라서 상대적으로 높은 온도와 긴 지속 양생 조건하에서 파괴에 대한 저항력이 크게 나타났다. The compressible, tensible, and flexibleresistance of the high strength concrete is analyzed by the experimentation in the present study. For the test, we cure several samples with the silica fume as a mixture being become dense the spaces between the particle of cement under the variation of both the temperature and the curing-interval. Then, the superplasticizer and the ezcon are also used to satisfy the required workability for construction. The compressible, tensible, and flexible resistances to a stress are increased as increasing the temperature and the time interval for the curing. Therefore it is concluded that the overal fractural and mechanical properties is improved by mixing the silica fume into the cement.

상지 단순반복작업 근로자의 수근관 증후군 유병률에 관한 조사

손지언,장태원,김윤규,홍영습,정갑열,김동일,이강진,하남진,김상범,김준연 대한산업의학회 2001 대한직업환경의학회지 Vol.13 No.3

목적 : 본 연구는 수근관 증후군의 발생위험이 높은 작업형태에 종사하는 상지 단순반복작업근로자로서 육류 및 어류 가공 사업장과 목재소 근로자에서 근전도검사를 이용하여 수근관 증후군의 유병률을 조사하고자 하였다. 방법 : 상지 단순반복작업근로자로서 육류 및 어류 가공 사업장 근로자 69명과 목재소 근로자 17명을 실험군으로, 관리직, 경리, 경비등 상지의 단순반복작업이 없는 근로자 28명을 대조군으로 선정하여, 작업적 및 병력조사, 이학적 검사와 근전도검사를 통해 수근관 증후군의 유병률을 조사하였다. 결과 : 수근관 증후군의 유병률은 육류 및 어류 가공 사업장과 목재소에서 각각 26.09 % (18명)와 29.41 %(5명)로 조사되었으며, 육류 및 어류가공사업장과 목재소 근로자를 '7년 이상과 미만의 작업기간'으로 층화하여 비교한 결과 '상지부위의 통증 호소 유무', 'Visual Analogue Scale(VAS: 총 10점) 4점 이상 여부', 'Tinel teat 양성 유무', 'Phalen test 양성 유무'는 모두 단기 작업근로자군에서 양성의 빈도가 증가되었고 '수근관 증후군 유무'는 장기작업근로자군에서 양성의 빈도가 증가되었다. 결론 : 육류 및 어류 가공 사업장과 목재소의 수근관 증후군 유병률은 각각 26.09 %와 29.41 %로 육류 및 어류 가공 사업장과 목재소는 1996년 OSHA가 지정한 바와 같이 위험한 작업요인이 있는 작업장으로 분류하여 관리되어야 할 것으로 생각된다. Objectives : This study was carried out to survey on the prevalence of Carpal Tunnel Syndrome(CTS) in high risk jobs(meat and fish processing plant and wood plant), by application of Nerve Conduction Study(NCS), a confirmatory diagnostic method. Methods : Experimental group was 69 workers sampled from meat and fish processing plants and 17 workers sampled from wood plants, who were simple, repetitive workers using upper extremities and control group was 28 workers sampled from managers, secretaries and keepers. All employees were examined through work history, physical examination and NCS. Results : 18 workers(26.09%) in meat and fish processing plants, and 5 workers(29.41%) in wood plants had compatible findings to NIOSH diagnostic criteria for CTS. The experimental group had more symptoms (complaint of upper extremities, Visual Analogue Scale ≥4(VAS: total 10 point)), signs(Tinel and Phalen test) and prevalence of CTS than control group(p<0.05). The prevalence of symptoms and signs were higher in short term workers(<7 years), but the prevalence of CTS was higher in long term workers(≥7 years). Conclusions : The prevalence of CTS in meat and fish processing plant and wood plant were 26.09% and 29.41% respectively. Authors propose that meat and fish processing and wood plants should be managed as a risk job category which were designated by OSHA in 1996

Ramsay-Hunt Syndrome 환자 1례에 대한 증례보고

김일수,송인선,유호상,손원택,오민석,송태원 대전대학교 한방병원 2001 惠和醫學 Vol.10 No.1

Ramsey-Hunt Syndrome occurs when herpes zoster after the facial nerve. It causes vesicular eruption of the pinna, external auditory meaturs and ear drum, severe otalgia with associated facial paralysis and vertigo. We experienced a case of Ramsay Hunt syndrome and managed it with oriental medicine's teatment and therapy of western medicine

도계처리과정에 사용되는 물에서 분리한 세균군과 각 세균종에 대한 살균제의 효능에 대하여

김성일,오경록,안동수,안태근,고경원,이민웅 동국대학교 대학원 1987 연구논집 Vol.17 No.-

탄소섬유시트로 보강된 RC보의 휨거동에 대한 실험적 연구

김성도,황태일 경성대학교 공학기술연구소 2002 공학기술연구지 Vol.9 No.-

The flexural behavior of a strengthened beam, that is a reinforced concrete beam with externally bonded fiber sheets, was theoretically and experimentally investigated. A rectangular beams having a width of 20㎝, depth of 30㎝, and effective depth of 25㎝ were tested. Carbon fiber sheets with a width of 15㎝ are externally bonded at the bottom face of the beam. From the experimental results, a variety of failure modes have been identified, ranging from crushing of the concrete to delamination of the fiber sheets. The paper presents the results of experimental and analytical studies concrening the flexural behavior of RC beams with fiber sheets. Included in the study are the effect of the amount of carbon fiber sheets varying from 1 to 4 plies on the beam strength enhancement and the valid estimation of the rupture strain of the fiber sheets.

도계처리과정에 사용되는 물에서 분리한 세균군과 각 세균종에 대한 살균제의 효능에 대하여

김성일,오경록,안동수,안태근,고경원,이민웅 동국대학교 대학원 1987 大學院硏究論集-東國大學校 大學院 Vol.17 No.-

The highest number of bacterial cell was observed in chicken washed water compared with the natural and chilled water. Fifteen bacterial strains were islated from the chicken processing water. When they were identified by the Bergey's Mannual of determinative bacteriology, they were all identified as the family Enterobacteriaceae; one genus of Citrobacter, three genera of Enterobacter, and four genera of Klebsiella except one isolate unknown. The concentration of Na₂HCIO₄to inhibit all the bacterial strains 30ppm, on the other hand the concentration of CIO₂to retard bacterial growth was 70ppm. The effective concentration of CIO₂was various according to bacterial species.

La, Mg 이온교환 ZSM-5 촉매의 제조와 촉매 산강도에 따른 MTO 반응 활성의 검토

김한일,황종현,정태환,정석진 경희대학교 산학협력기술연구원 1997 산학협력기술연구논문집 Vol.3 No.-

The MTO(methanol to olefin) process that aims at the production of olefins from methanol has attracted research interest because of its possiblity as another source of raw material in petrochemical industries. However its reaction path is not only ceased at the point of olefin production but also much amount of by products such as paraffins and aromatics that accelerate carbon deposit are produced. Thus the catalyst deactivation is rapidly progressed. In order to maximize the selectivity from methanol to olefin, alkylation and aromatization should be excluded from reaction path through catalyst and process variables. In this viewpoint, as a solution of the former problem, various metals were substituted on HZSM-5 which is used in commercial MTO process. With NH_3 TPD and activity test, the correlation between reaction products and possibility in control of Bro¨nsted acid site which is reported as the reaction active site was investigated. In this study, ethylene and propylene are the target products because of their wide applicating field.

파종시기가 다른 일미찰의 등숙 중 호화 특성 비교

김미정, 박효진, 이유영, 김선림, 김정태, 우관식, 권영업, 정일민 忠北大學校 農業科學硏究所 2014 農業科學硏究 Vol.30 No.2

This study was conducted to investigate the pasting properties of waxy corn ‘Ilmichal’ during ripening with different sowing date. Starch content of Ilmichal was increased as matured (p<0.05). Analysis of pasting properties with waxy corn starch using a rapid visco analyser (RVA) showed linear changes in peak viscosity, trough viscosity, final viscosity, breakdown and consistency according to ripening. There were significantly positive correlation between starch content of Ilmichal and peak viscosity (0.39*), trough viscosity (0.58***), final viscosity (0.58***), and consistency (0.57**). Differential scanning calorimerty (DSC). The enthalpy of gelatinization was increased as ripening. But onset and peak temperature were decreased. There were significantly positive correlation between starch content of Ilmichal and onset temperature (0.44*), peak temperature (0.38*), and completion temperature (0.59***), on the other hand, crude protein content presented significantly negative correlation between completion temperature (-0.41*).

자궁경부종양에서 HPVDNAChip^(�) 및 Hybrid Capture Ⅱ^(TM)검사를 이용한 인유두종 바이러스의 검출

여소진,김달수,남계현,심일구,김태희,이해혁,이권해 대한부인종양 콜포스코피학회 2003 Journal of Gynecologic Oncology Vol.14 No.2

목적 : 인유두종 바이러스는 자궁경부암의 의의있는 원인 인자이다. 이 연구의 목적은 HPVDNAChip??검사를 이용하여 정상, 전암병변, 침윤성 경부암의 인유두종 바이러스의 분포를 알아보고 그 결과를 Hybrid CaptureⅡ^(^(TM)) 검사와 비교하였다. 연구 방법 : 149명의 대상환자 중 57명은 병변이 없었고, 59명은 전암 병변이었으며, 33명은 침윤성 경부암이었다. HPVDNAChip??검사와 이 검사처럼 아형 66, 69를 제외한 고위험군(HPV-16/18/31/33/35/45/51/52/56/58/59/68) 인유두종 바이러스를 검사할 수 있는 Hybrid CaptureⅡ^(^(TM))검사를 이용하여 연구하였다. 결과 : 두 검사 모두 인유두종 바이러스를 검사하는 데 유용하였고, 결과가 의의있게 일치하였다(kappa value 0.721, p<0.01). Hybrid CaptureⅡ^(^(TM))검사에서 양성이나 HPVDNAChip??검사에서 음성인 경우는 18명(12.1%)으로 평균 Hybrid CaptureⅡ^(^(TM))값이 120.7±233.0 (mean±SD)이였고, 두 검사 모두 양성인 경우의 Hybrid CaptureⅡ^(^(TM))값은 448.1±732.8 (mean±SD)이였다. Hybrid CaptureⅡ^(^(TM))검사의 민감도는 94.6%이고, 특이도는 78.9%였고 HPVDNAChip??검사의 민감도는 83.7%이고, 특이도는 89.5%였다. HPVDNAChip??검사는 모두 15가지의 고위험군의 인유두종 바이러스 아형을 알아낼 수 있으며 아형 16이 전암병변(28.8%, 15/59)과 침윤성 경부암(48.5%, 19/33)에서 가장 흔한 아형이었으며 그 다음으로 흔한 아형은 58이었다. 결론 : HPVDNAChip??검사는 Hybrid CaptureⅡ^(^(TM))검사처럼 인유두종 바이러스 검사에 매우 민감하고 유용한 검사이다. HPVDNAChip??검사는 Hybrid CaptureⅡ^(^(TM))검사와 비교할 때, 인유두종 바이러스의 아형과 중복감염에 대한 정보를 준다. 앞으로 HPVDNAChip??검사의 자궁경부암의 선별검사로서의 가치에 대한 연구가 더 필요하다. Objective : Human Papillomavirus (HPV) is well known as one of the major risk HPVDNAChip?? factors for cervical cancer. The purpose of this study is to know HPV genotype distribution in women with normal cervix, precancerous lesion, and invasive cervical cancer by HPVDNAChip?? test. In addition, the result of HPVDNAChip?? test was compared with Hybrid CaptureⅡ^(TM) system for HPV detection. Methods : One hundred forty nine patients were included in this study. 57 women had normal cervix, 59 women had precancerous lesion, and 33 women had invasive cervical cancer. We tested them with two method for detection of Human Papillomavirus (HPV) by HPVDNAChip?? test and Hybrid CaptureⅡ^(TM) system. Hybrid CaptureⅡ^(TM) test can detect same high-risk HPVs (16/18/31/33/35/39/45/51/52/56/58/59/68) with HPVDNAChip?? test which can detect additional 66 & 69 high risk types of HPV. Results : Both methods for the detection of HPV were useful tests. The correlation between the results of two methods was very significant (kappa value 0.721 [p<0.01]). Positive Hybrid CaptureⅡ^(TM) test and negative HPVDNAChip?? test group were 18 women (12.1%) and average Hybrid CaptureⅡ^(TM) titer value of this group was 120.7±233.0 (mean±SD), positive Hybrid CaptureⅡ^(TM) test and positive HPVDNAChip?? test group were 84 women (54.4%) and average titer was 448.1±732.8. The Hybrid CaptureⅡ^(TM) test showed a sensitivity of 94.6% and a specificity of 78.9% and the HPVDNAChip?? test showed a sensitivity of 83.7% and a specificity of 89.5%. HPVDNAChip?? test detected total 14 genotype of HPV. HPV-16 was 28.8% (15/59) in precancerous lesion and 48.5% (19/33) in invasive cancer, most common in both groups. Next common type HPV-58 was 25.4% (12/59) in precancerous lesion and 9.1% (3/33) in invasive cancer. Conclusion : HPVDNAChip?? test is very sensitive and effective method for detection of Human Papillomavirus (HPV) infection as Hybrid CaptureⅡTMtest. In comparison with Hybrid CaptureⅡ^(TM) test, HPV genotype and multiple HPV infection information can be given by HPVDNAChip?? test. Further study will be needed to know the value of screening of cervical cancer by HPVDNAChip?? test in future.

식도에 발생한 원발성 소세포암 1예

류보열,김태종,곽재정,김영학,박찬국,김만우,이승일,기근홍 조선의대 1995 The Medical Journal of Chosun University Vol.20 No.2