외부온도에 따른 폴리머 콘크리트의 강도특성 변화

이윤수,주명기,최만용 강원대학교 부설 석재복합신소재 제품연구센터 2002 석재연 논문집 Vol.7 No.-

불포화 에스터 수지의 큰 이용분야의 하나로 건축재료가 있으나 여기서 가장 문제로 되어 있는 것이 바로 열적 특성의 개선이다. 따라서 본 연구에서는 외부온도가 폴리머 콘크리트의 강도특성에 미치는 영향을 검토하기 위하여 외부온도 20∼120℃ 범위로 하여 폴리머 콘크리트의 물리·역학적 특성을 구명하는데 목적이 있다. 본 연구에서는 불포화 폴리에스터 수지를 결합재로 하고 탄산칼슘을 충진재로, 규사를 잔골재로 치환하고, 굵은골재를 쇄석으로하는 폴리머 콘크리트를 제조하여 외부온도에 따른 강도특성을 검토한 바, 폴리머 콘크리트의 사용 적정온도는 50℃이내가 적당할 것으로 판단되며, 50℃이상에서 사용할 경우는 난연성이 우수한 탄소섬유를 사용해야 할 것이다. In this study, the polymer concrete was made to investigate its strength properties, in which unsaturated polyester resin was used as s binder, calcium carbonate as the filler and silica sand as th fine aggregate, and crushed stone as the coarse aggregate. The effects according to the external temperature on strength properties of polymer concrete were examined. Test result showed that the compressive, flexural and tensile strengths of the polymer concretes decreased with increasing external temperature. The elasticity of modulus of the polymer concretes decreased with increasing external temperature.

부여 백제시대 가마터의 고고지구자기 연구

이윤수,서광수,서만철 공주대학교 문화재보존과학연구소 2004 문화재과학기술 Vol.3 No.1

충남 부여군 가마터에 대한 고고지자기 연구를 실시하였다. 13개의 가마 시료로부터 구한 특성잔류자화는 열화학작용에 의해서 생성된 자철석에 의해서 수행되며, 가마가 575℃이상 가열된 후 식으면서 그 당시의 지구자기장에 의해서 획득된 것으로 밝혀졌다. 이번 연구에서 구한 특성잔류자화의 그 평균편각과 평균복각은 각각 3.9˚E와 39.4˚ (a_(95)=3.2˚)로서, 한반도의 시험적 영년변화곡선에 대비하여 구한 특성잔류자화의 획득 시기는 서기 1,583년(+44년, -36년)이다. The archaeomagnetic study is examined to determine archomagnetic age of the kiln located in Buyeo area, Chungnam province. The results document that the characteristic remanent magnetization(ChRM) for 13 samples is carried by magnetite grains formed by a thermochemical activity during cooling from more than 575˚C. The Site mean direction (declination and inclination) for the ChRM is 3.9˚E and 39.4˚ (a_(95)=3.2˚). We conclude that the ChRM acquired in A.D. 1,583 (+44 yr, -36 yr), correlating the t-KPSV (tentative Korea Paleoselcular Variation) curve.

배드민턴 선수의 경쟁상태불안이 경기력에 미치는 영향

두만균,김연수,이호성 圓光大學校 附設 體力科學硏究所 2002 體力科學硏究 Vol.25 No.1

The purpose of this study was to determine the relationship of competition anxiety of badminton players, including physical competition anxiety, cognitive competition anxiety, and competition confidence, to their athletic capabilities to help them get better record. The subjects in this study were 100 selected male and female badminton players. The statistical techniques employed in this study were t-test, one-way ANOVA, correlation analysis and stepwise multiple regression procedures. After the collected data were analyzed, the following findings were given; First, the physical and cognitive competition anxieties of the badminton players investigated didn't significantly vary with their gender. But their competition confidence was different according to gender. Second, the player career made a significant difference to their physical and cognitive competition anxieties The physical and cognitive competition anxieties of the players were on the decrease with age. Their competition confidence didn't differ with player career. Third, the athletic capability of the players was affected by their own competition anxiety. Specifically, the physical competition anxiety, one of the competition anxiety subfactors, and competition confidence had more effect on improving their athletic capabilities.

전자토모그래피의 정량적 분석에서 대물렌즈 조리개의 영향

김진규,이상희,권희석,정종만,정원구,이수정,주형태,김윤중 韓國電子顯微鏡學會 2008 Applied microscopy Vol.38 No.4

Electron tomography의 정량적 분석을 위해서 대물렌즈 조리개가 투과빔의 강도에 미치는 영향을 평가하였다. Electron tomography에 도입되는 Beer’s law의 올바른 적용을 위해서는 투과빔은 시료의 기울기에 따른 mass thickness의 변화에 의한 효과만을 반영해야 한다. 그러므로 빔 경로상의 대물렌즈 조리개, 홀더 등에 의한 다른 효과는 제거되어야 한다. 본 연구에서는 대물렌즈 조리개의 cut-off 효과를 120 kV TEM과 Quantifoil holey 카본 시료를 이용하여 상세히 평가하였다. 대물렌즈 조리개를 사용하지 않은 경우와 비교할 때, 30 μm 크기의 대물렌즈 조리개를 통과한 투과전자빔의 강도는 약 16.7%의 감소가 일어난다. 또한 55˚이상의 고경사각 기울기에서는 대물렌즈 조리개의 cut-off 효과에 의해 14.2%의 강도 감소가 추가적으로 발생함을 알 수 있었다. Electron tomography에서 정량적 분석을 위해서는 이러한 대물렌즈 조리개의 영향을 고려해야만 한다. 또한 Beer’s law의 올바른 적용을 위해서는 일련의 기울기에 따른 2차원적 영상은 가능하면 대물렌즈 조리개를 사용하지 않은 상태에서 획득하는 것이 바람직하다. We have evaluated the effects of experimental factors on transmitted electron beam intensities for quantitative analysis in electron tomography. For the correct application of Beer’s law in electron tomography, the transmitted beam intensity should reflect the net effect of mass properties on beam path. So, the any other effects of the objective aperture and the specimen holder on beam path should be removed. The cut-off effects of objective aperture were examined using Quantifoil holey carbon film and a transmission electron microscope operated at 120 kV. The transmitted beam intensities with 30 μm objective aperture dropped about 16.7% compared to electron beam intensities without the objective aperture. Also, the additional losses of about 14.2% at high tilt angles were occurred by cut-off effects of the objective apertures. For the precise quantitative analysis in electron tomography, the effect of the objective aperture on transmitted electron beam intensities should be considered. It is desirable that 2-D tilt series images are obtained without the objective aperture for correct application of Bee’s law.

곤충

장영덕,윤영남,장철,이만영 忠南大學校 環境問題硏究所 1992 環境硏究 Vol.10 No.-

1992년 9월 4일부터 5일 까지에 전라북도 진안군에서 조사된 곤충류는 총 9목 58과 176종이었다. 조사된 종류중 노린재목이 41종으로 가장 많았으며 딱정벌레류는 빈약한 편이었다. 또한 남부지방의 타지역에 비해 특기할 만한 종이나 현상은 없는 편이었다. 종다양도는 site A1에서 34.167로, 우점도는 site Y3에서 0.779로, 종풍부도는 site S1에서 4.327로 가장 높게 나타났으며 지역간 유사도는 인정되지 않았다.

췌장을 침습한 위의 암육종 1 예

김병호,김효종,조진만,김윤화,이정일,동석호,장영운,황일섭,장 린 대한소화기내시경학회 1999 Clinical Endoscopy Vol.19 No.1

Carcinosarcoma of the stomach is regarded as a rare malignant neoplasm composed of both carcinomatous and sarcomatous components in a given tumor. Few cases have been reported since 1904. This is a case of carcinosarcoma of the stomach in a 61-year-old man. He suffered from indigestion, vomiting, and epigastric pain. Endoscopic finding showed a huge protruding mass with intact mucosa on the posterior wall of the antrum up to the pylorus. Surgery was performed and carcinosarcoma with pancreatic invasion was confirmed by pathology.

부산·울산·경남지역 직업병 감시체계

김정일,김병권,김정원,채창호,이철호,강동묵,김지홍,김진하,김영욱,이영하,이지호,김정호,윤형렬,유철인,정백근,장태원,김운규,윤동영,강진욱,김종은,안진홍,이동준,장준호,이광영,송혜란,최영희,이용환,조병만,최홍렬,고상백,김은아,이유진,홍영습,정갑열,김정만,김준연 大韓産業醫學會 2004 대한직업환경의학회지 Vol.16 No.1

Objective: Occupational medicine specialists in the Busan, Ulsan and Kyung-Nam areas established an area-based occupational disease surveillance system and used this system to collected case information for the purpose of preventing occupational diseases Methods: l l hospital participated in this system. The authors selected five main diseases, which were hand-arm vibration syndrome (HAVS), work-related musculoskeletal disorder (WRMSD), occupational asthma, occupational skin disease and occupational and occupational lung cancer and established their case definitions. All cases were reported on the web, and real time analysis was conducted. Results: Between April 2001 and April 2003, 192 cases of HAVS, 118 cases of WRMSD, 33 cases of occupational asthma, 17 cases of occupational skin disease and 17 cases of occupational lung cancer (for a total of 377 cases of these five main diseases) were reported. most of the HAVS cases came from shipbuilding, and 172 of them (92.7%) were associated with grinding. Of the four main types of WRMSD, carpal tunnel syndrome (CTS) was the most prevalent with 46 cases and shipbuilding was also the main industry involved (83.9%). The ergonomic risk factors involved mainly associated with the hand. In 19 (57.6%) and 4 (12.1%) cases of occupational asthma, the agents involved. The causative agents of occupational lung cancer included Cr, welding fume, PAH, Ni, etc. 10(58.8%) of the cases were diagnosed as squamous cell carcinoma and 5(29.4%) as adenoma. Conclusion: This result showed that an area-based occupational disease surveillance system might provide an effective method of evaluating the prevalence of such diseases, however the Busan, Ulsan and Kyung-Nam provinces are too large to be treated as individual areas. Therefore, the authors suggest that each province should establish its own surveillance system.

Contrast Echocardiography in the early Diagnosis of Pulmonary Arteriovenous Malformations

Youn, Moon-Hee;Lee, Myung-Hyun;Song, Mi-Ae;Kim, Min-Joo;Lee, Min-Young;Chung, Woo-Baek;Hwang, Hui-Jeong;Choi, Yun-Seok;Park, Chul-Soo;Shim, Sung-Bo;Lee, Man-Young 중앙대학교 의과대학 의과학연구소 2012 中央醫大誌 Vol.37 No.1/2

Pulmonary arteriovenous malformations are rare congenital anomaly in the lung which causes shunting of venous blood in the pulmonary artery to systemic circulation, associated with hereditary hemorrhagic telangiectasia in the majority of cases and often presenting with dyspnea or major neurological complications due to paradoxic embolism. This case shows that contrast enhanced echocardiography is a useful diagnostic tool for the patient with undiagnosed of progressive dyspnea and cyanosis.

<i>Eimeria</i> species in cattle with diarrhoea in the Republic of Korea regarding age, season and nature of diarrhoea

Lee, Seung-Hun,Kim, Ha-Young,Lee, Haeseung,Kim, Jong Wan,Lee, Yu-Ran,Chae, Myeong Ju,Oh, Sang-Ik,Kim, Jong Ho,Rhee, Man Hee,Kwon, Oh-Deog,Goo, Youn-Kyoung,Kim, Tae-Hwan,Geraldino, Paul John L,Kwak, Do BMJ Group Group Ltd 2018 The Veterinary record Vol.183 No.16

<P>This study evaluated the prevalence of <I>Eimeria</I> species, particularly <I>E bovis</I>, <I>E zuernii</I> and <I>E auburnensis</I> that are pathogenic to cattle, in faecal samples collected from cattle with diarrhoea reared in the Republic of Korea by using microscopy and PCR. In addition, the prevalence of <I>Eimeria</I> species was analysed according to age, type of cattle, region, season and nature of diarrhoea. Overall, <I>Eimeria</I> species were identified in 279 of the 1261 (22.1 per cent) faecal samples through microscopy, and statistical analysis revealed a lower prevalence in calves aged than three weeks or less and higher prevalence in cattle with haemorrhagic diarrhoea. Of the 279 microscopy-positive samples, <I>E bovis</I>, <I>E zuernii</I> and <I>E auburnensis</I> were identified in 100 (7.9 per cent), 83 (6.6 per cent) and 27 (2.1 per cent) faecal samples, respectively, by using PCR. To the authors' knowledge, this study is the first to apply PCR for epizootiology of bovine coccidiosis.</P>

The Effect of Choline Acetyltransferase Genotype on Donepezil Treatment Response in Patients with Alzheimer’s Disease

Lee, Kang Uk,Lee, Jung Hie,Lee, Dong Young,Youn, Jong Chul,Kim, Jeong Lan,Moon, Seok Woo,Kim, Bong-Jo,Ryu, Seung-Ho,Kim, Moon Doo,Lee, Chang-Uk,Lee, Nam-Jin,Chang, Sung Man,Kim, Young Hoon,Kim, Do Hoo Korean College of Neuropsychopharmacology 2015 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.13 No.2

<P><B>Objective</B></P><P>We examined the difference in responses to donepezil between carriers and non-carriers of the A allele at the +4 position of the choline acetyltransferase (ChAT) gene in Koreans.</P><P><B>Methods</B></P><P>Patients who met the criteria for probable Alzheimer’s disease (AD) (n=199) were recruited. Among these, 145 completed the 12-week follow-up evaluation and 135 completed the 26-week scheduled course. Differences and changes in the Korean version of the mini-mental state examination (MMSE-KC) score, Korean version of the Consortium to Establish a Registry for Alzheimer’s Disease Neuropsychological Assessment Battery (CERAD-K[N]) wordlist subtest score (WSS), CERAD-K(N) total score (TS), and the Korean version of geriatric depression scale (GDS-K) score between baseline and 12 weeks or 26 weeks were assessed by the Student’s <I>t</I>-test.</P><P><B>Results</B></P><P>At 12 weeks, the changes in the MMSE-KC score, CERAD-K(N) WSS, and CERAD-K(N) TS from baseline were not significant between ChAT A allele carriers and non-carriers; however, at 26 weeks, these changes were significantly larger in ChAT A allele carriers than in non-carriers (<I>p</I>=0.02 for MMSE-KC and <I>p</I>=0.03 for CERAD-K(N) WSS respectively).</P><P><B>Conclusion</B></P><P>Our findings in this study suggested that presence of the A allele at the +4 position of ChAT might positively influence the treatment effect of donepezil in the early stages of AD in Koreans.</P>