휴대폰 카메라용 자동초점 구동기의 충격해석

이성민,김봉석,송준호,이수훈,이혜진,이문구,송준엽,이창우 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

Recently, the robustness against daily impact is important according to portablization and downsizing of mobile electronics. Especially, almost parts of cellular phone should undergo drop test when they fall 1.5 m above ground. This test simulates the case when cellular phone slips through user's fingers while he is talking on the phone. This paper studies a drop test of auto focusing (AF) actuator for camera module in cellular phone. This component is composed of voice coil motor (VCM) as an actuator and leaf spring as a guide and suspension. The leaf spring's deformation is essential for the test because its permanent distortion disables the focusing, and then, a high quality photograph cannot be obtained. Up to now the drop test has been carried out after fabricating real AF actuator. We propose a dropt test model which simulates the drop test based on finite element analysis. This model makes us enable investigate the stress acting on the clamping and curved parts of leaf spring. Stress over Von Mises criterion lets the spring deformed permanently, and then AF actuator malfunctioned, It helps us to design and modify AF actuator without manufacturing the real product. And also, it saves the time and cost for the development of new products.

표면근전도와 적외선체열촬영을 이용한 요통의 평가

이강진,최인성,이소영,한재영,이삼규,채홍재,이성과,문재동 대한산업의학회 2001 대한직업환경의학회지 Vol.13 No.3

목적 : 요통환자에서 요통의 유무와 강도를 평가하고자 표면근전도를 이용하여 근육 활동성의 차이를 검증하였고 적외선체열촬영을 이용하여 제표면 온도의 변화를 측정하였다. 방법 : 요통환자군 16명과 대조군 16명에 대하여 요부에 부착한 표면전극에서 얻은 근전도 신호와 적외선체열촬영 결과를 비교하였다. 교란요인의 영향을 배제하기 위하여 연령과 성별 그리고 비만도에 따라 정상 대조군과 요통환자군을 짝짓기하여 각각 16명씩 선정하였다. 결과 : 정적표면근전도 실시 결과 우측의 경우 중앙값이 요통환자군에서 198.1 ㎶, 정상대조군에서는 161.3 ㎶로 통계적으로 유의한 차이가 있었고(p<0.01), 좌측은 요통환자군에서 194.2 ㎶, 정상대조군에서 180.5 ㎶로 유의한 차이는 없었다. 동적표면근전도 실시 결과 재신전시와 굴곡시 근전위의 비가 우측의 경우 요통환자군에서 중앙값이 1.12였고 정상 대조군은 1.39로서 두 군간에 유의한 차이가 있었고(p=0.027), 좌측의 경우도 요통환자군에서는 1.08이었고 정상 대조군에서는 1.21로 유의한 차이가 있었다(p=0.036). 적외선체열촬영결과 ΔT가 0.5 ℃ 이상의 차이가 있을 때 이상이 있는 것으로 정하면, 요통환자군에서는 16명 모두 이상자로 판정되었고, 정상 대조군에서는 16명중 3명이 이상자로 판정되어 민감도는 100 %, 특이도는 81.3 % 였다. 표면근전도를 이용한 요통의 진단은 민감도가 78.6 %이고 특이도가 72.2 %였으며, 적외선체열촬영은 민감도가 100 %였고 특이도가 87.5 %였다. 결론 : 이러한 결과로 볼 때 표면근전도 검사법과 적외선체열촬영은 요통을 간접적으로 평가하는데 도움이 되는 검사법이며, 적외선체열촬영이 표면근전도검사법에 비하여 보다 정확한 검사법으로 판단된다. Objectives : We studied the efficacy of surface electromyography(SEMG) and digital infrared theimographic imaging (DITI) in the assessment of low back pain both(LBP) Methods : We compared electromygraphic signals from electrodes placed in the lumbar area and the digital theimographic images in 16 LBPpatients and 16 control subjects. The LBP patients and the control subjects were matched for age, gender, and body mass index(BMI) to adjust for any confounding effects Results : In the static analyses of SEMG, median value was 198.1 ㎶ for the controls on the right side, and they were 194.2 ㎶ and 180.5㎶ on left side respectively. There was a statistically significant difference between the two groups on the right side(p<0.01), but not on the left side. In the dynamic analyses of the SEMG, the median values of the extension per flexion ratio of right side were 1.12 for LBP patients and 1.39 for controls. and those on the left side were 1.08 and 1.21 respectively. There were statistically significant differences in both sodes(p<0.05). The sensitivity and specificity were 100% and 81.3% in DITI, 78.6% and 72.2% in SEMG. Conclusions : These results indicate that SEMG and DITI are useful methods for indirect assessments of LBP, and that DITI is more sensitive and specific than SEMG.

혼합형 자가면역성 용혈성 빈혈을 동반한 전신성 홍반성 루푸스 1예

이승철,김선임,이승훈,이현경,조남국,한성훈,유영진,조종래 인제대학교 2000 仁濟醫學 Vol.21 No.2

A 17-year-women developed mixed warm and cold antibody type autoimmune hemolytic anemia associated with systemic lupus erythematosus. The patients was admitted to our hospital for syncope. Jaundice was observed. Urinalysis revealed protein and hemoglobin. Her hemoglobin was 4.6g/dl and reticulocytes were 10%. Total bilirubin was elevated, while haptoglobin and complement were abnormally reduced. ANA and mitochondrial Ab were detected. The direct and indirect Coombs test were positive. The direct antiglobulin test was positive ; IgG and C3d were detected on the red cell surface. The cold agglutinin(CA) titer was 128. The patients was initially treated with high dose steroid therapy. However the patients did not responded to high dose steroid therapy. We treated the patients with plasmapheresis and synchronized cyclophosphamide therapy. Clinical remission of hematologic complications was achieved in this patients. We report a case of mixed type autoimmune hemolytic anemia with SLE that responded plasma pheresis and synchronized cyclophosphamide therapy.

Bupivacaine과 ropivacaine이 Xenopus oocyte에 발현된 HERG 전류에 미치는 영향

김국성,이규승,김효신,손숙진,이상도,김광진,전병화,김윤희,박진봉 충남대학교 의과대학 의학연구소 2003 충남의대잡지 Vol.30 No.1

Bupivacaine is an amide-type local anesthetic widely used for regional anesthesia. Ropivacaine is developed as a less cardiotoxic alternatives to bupivacaine. In the present study, we have analyzed the effects of bupivacaine and ropivacaine on HERG currents expressed in Xenopus oocytes. Bupivacaine and ropivacaine(3∼1,000μM) blocked HERG currents in a concentration dependent manner. EC_(50) was 26.1±3.1μM(n_(R) 0.65±0.04) and 43.5±7.9μM(n_(H) 0.99±0.13) in bupivacaine and ropivacaine, respectively. Bupivacaine and ropivacaine did not affect the activation and deactivation kinetics of HERG channels. However, the drugs decreased the slope conductance measured from fully activated current-voltage relationship curves. These results suggest that bupivacaine and ropivacaine have a similarinhibitory effect on HERG channels, which could be a possible cellular mechanism of LQT or ventricular arrythmia by the drugs.

정신보건관련시설 입원(소)자의 주요 정신장애 유병률 : 전국 20개 시설의 입원(소)자를 대상으로

조성진,조맹제,서동우,함봉진,홍진표,배재남,이준영,이동우,박종익,전홍진,김성주,김용익 大韓神經精神醫學會 2004 신경정신의학 Vol.43 No.6

Objectives : One of the objectives of this study is to estimate the prevalence rates of psychiatric diagnoses in the combined populations of psychiatric hospitals, psychiatric nursing facilities and homeless asylums using the Korean version of the Composite International Diagnostic Interview (K-CIDI), which is a comprehensive and fully standardized interview schedule to assess psychiatric disorders for diagnosis. The Other objective is to compare with previously studied prevalence rates of Psy-chiatric diagnoses using the results of this study. Methods : The study subjects, aged from 181o 64 years, were randomly selected from 64,582 institutionalized population of psychiatric hospitals, Psychiatric nursing facilities and homeless asylums as of 30, June, 2001. Twelve trained interviewers administered the K-CIDI to the selected respondents. A total of 1,875 respondents (male 1,194, female 681) completed the interview. Results : The lifetime and one year prevalences of any diagnosis excluding nicotine dependence · withdrawal, anxiety disorder, eating disorder, somatoform disorder were 88.2% (male 88.1%, female 88.3%), and 65.8% (male 62.7%, female 73.7%), respectively. The lifetime and one year prevalences of schizophrenia and other psychotic disorders were 78.5% (male 75.3%, female 83.7%), and 56.8% (male 51.9%, female 64.8%), respectively. The lifetime and one year prevalences of alcohol use disorder (dependence/abuse) were 26.7% (male 37.9%, female 8.3%), and 8.7% (male 12.8%, female 2.1%), respectively. The lifetime and one year prevalences of mood disorder were 18.1% (male 13.5%, female 25.8%), and 10.4% (male 7.2%,female 16.9%), respectively. The lifetime and one year prevalences of schizophrenia and other psychotic disorders were comparable with the 2001 community survey by 1.19% to 1.32%, and 0.51% to 0.61%, respectively. The lifetime and one year prevalences of schizophrenia were also comparable by 0.16% to 0.28%, and 0.16% to 0.25%, respectively. There were no significant changes of prevalence rates when correction were applied to other psychiatric diagnosis. Conclusion : The results of this study could be used for evaluating the distribution of psychiatric diagnoses in mental health related facilities and for planning mental health policies.

영구형 항서맥 심박조율기 환자의 장기추적관찰

최현석,이무용,최영진,최성준,김효수,손대원,오병희,이명묵,박영배,최윤식,이영우,이명용 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.5

UV-TiO₂광촉매 반응기를 이용한 미생물의 살균효과

김시욱,이정섭,정해광,박열,윤성명,유진철,이범규,이인화,박진열 조선대학교 환경공해연구소 1998 環境公害硏究 Vol.14 No.-

UV-TiO_(2) 반응기를 이용하여 Escherichia coli와 Aspergillus oryzae var. oryzae의 살균효과를 측정하였다. 254 ㎚에서 최대 14 watt의 자외선 방출량을 내는 램프를 원형 Pyrex유리관 중앙에 설치하였고 TiO_(2)는 석영관에 박막증착(Thin Film Coating)된 형태와 슬러리 형태로 나누어 회분식으로 살균정도를 측정하였다. E. coli에 대한 살균력은 1.7× 10^(7) cells/㎖에 대해 5분간 자외선 조사를 하였을 경우 2.0× 10^(2) cells/㎖으로 감소하였고, 자외선 조사와 함께 슬러리 형태의 TiO_(2)를 첨가하였을 경우에는 3.4× 10 cells/㎖으로, 자외선 조사와 함께 TiO_(2)가 석영관에 박막증착된 경우에는 7.6× 10^(2) cells/㎖으로 감소하였다. 한편 위와 같은 조건에 유리관 하부에서 기포를 주입후 11분 동안 자외선을 조사시킨 경우에는 1.3× 10^(2) cells/㎖으로, 자외선 조사와 함께 슬러리 형태의 TiO_(2)를 첨가하였을 경우에는 1× 100 cells/㎖으로, 자외선 조사와 함께 TiO_(2)가 박막증착된 경우에는 7.9× 10 cells/㎖을 나타내었다. 결국 UV-TiO_(2) 반응기에 사용되는 TiO_(2)가 슬러리 형태일 때 최대 살균효과를 나타내었으나 기포가 첨가되었을때는 오히려 살균에 장애를 받는 것으로 나타난 반면 석영관에 박막증착된 경우에는 기포가 첨가되는 것이 살균에 효과적인 것으로 관찰되었다. The killing effect of UV-TiO_(2) photocatalytic system on the Escherichia coli DH5-慣 and Aspergillus oryzae var. oryzae (KCTC 6095) was studied. The UV lamp which emits maximum 14 watts at 254 nm was set on the center of pyrex round glass tube. Two types of TiO_(2), one of which is slurry and another which is thin film coated form, were used to determine the killing effect. When UV was irradiated to 1.7 * 10^(5) cells/??of E. coli for 11 min, the living cell number decreased to 4.0 * 1.0^(0) cells/?? The effect of UV system together with slurried TiO_(2) was less than 1 cells/?? whereas that of UV-coated TiO_(2) system decreased to 7.1 * 10^(3) cells/?? To study the effect of bubble on the killing of microorganisms, air was bubbled to the bottom of glass tube. When 1.7 * 10^(5) cells/??were exposed to UV for 11 min in combination with air bubble, the living cell number decreased to 1.3 x 10^(2) cells/?? In the same condition except the addition of slurried TiO_(2), the living cells were 1 * 10^(2) cells/?? However, more cells could be killed by the system which consists of UV, coated TiO_(2), and air bubble (7.9 * 10^(1) cells/??. From these results, it was found that UV-slurried system is the most effective one, but its killing effect is not stimulated by air bubble. However, bubbling was very effective in the UV-coated TiO_(2) system.

7두의 개에서 배설성 요로조영술을 통한 신장 기능 평가

최윤정,이기자,최형준,이용진,박성준,송근호,정성목,최호정,이영원 忠南大學校 獸醫科大學 動物醫科學硏究所 2005 動物醫科學硏究誌 Vol.13 No.-

Excretory urography is a type of contrast study used to verify and localize upper urinary tract disease. It is an inexpensive and easy way to visualize of anatomic and functional status of the kidney and has been used as a primary imaging modality for the evaluation of urinary tract abnormalities. We describe urological signs of 7 dogs who examined with excretory urography and ultrasonography. Six cases were referred to veterinary medical teaching hospital. Chungnam national university (VMTH, CNU) to evaluate renal function after the treatment for renal failure and one case was referred showing hematuria. In case 1, 2 and 4, blood test and urinalysis was normal and the results of excretory urography presented that renal function were normal range. In case 3, the results of urinalysis, ultrasonography, and excretory urography except blood test presented abnormal kidney and hydronephrosis was diagnosed. In case 5 and 6, blood test, urinalysis, ultrasonography and excretory urography indicated renal failure. In case 7, blood test, urinalysis and ultrasonography presented partially abnormal signs, however, the results of excretory urography was normal range.

Functional Properties of Permeate Fractions Obtained from Bastard Halibut Roe Extracts by Ultrafiltration and It’s Biological Activities

Gyoon-Woo Lee1,In Seong Yoon,Su Gwang Lee,Jung-Suck Lee,Young-Mi Kang,Jin-Soo Kim,Min Soo Heu 한국수산해양기술학회(구 한국어업기술학회) 2016 한국수산해양기술학회 학술발표대회 Vol.2016 No.10

UV-TiO_2 광촉매 반응기를 이용한 미생물의 살균효과

김시욱,이정섭,정혜광,박열,윤성명,유진철,이범규,이인화,박진열 조선대학교 환경연구소 1998 環境硏究 Vol.14 No.1

UV-TiO_2 반응기를 이용하여 Escherichia coli와 Aspergillus oryzae var. oryzae의 살균효과를 측정하였다. 254㎚에서 최대 14 watt의 자외선 방출량을 내는 램프를 원형 Pyrex유리관 중앙에 설치하였고 TiO_2는 석영관에 박막증착(Thin Film Coating)된 형태와 슬러리 형태로 나누어 회분식으로 살균정도를 측정하였다. E. coli에 대한 살균력은 1.7×10^7 cells/㎖에 대해 5분간 자외선 조사를 하였을 경우 2.0×10^2 cells/㎖으로 감소하였고, 자외선 조사와 함께 슬러리 형태의 TiO_2를 첨가하였을 경우에는 3.4×10 cells/㎖으로, 자외선 조사와 함께 TiO_2가 석영관에 박막증착된 경우에는 7.6×10^2 cells/㎖으로 감소하였다. 한편 위와 같은 조건에 유리관 하부에서 기포를 주입수 11분 동안 자외선을 조사시킨 경우에는 1.3×10^2 cells/㎖으로, 자외선 조사와 함께 슬러리 형태의 TiO_2를 첨가하였을 경우에는 1×102 cells/㎖으로, 자외선 조사와 함께 TiO_2가 박막증착된 경우에는 7.9×10 cells/㎖을 나타내었다. 결국 UV-TiO_2 반응기에 사용되는 TiO_2가 슬러리 형태일 때 최대 살균효과를 나타내었으나 기포가 첨가되었을때는 오히려 살균에 장애를 받는 것으로 나타난 반면 석영관에 박막증착된 경우에는 기포가 첨가되는 것이 살균에 효과적인 것으로 관찰되었다. The killing effect of UV-TiO_2 photocatalytic system on the Escherichia coli DH5-α and Aspergillus oryzae var. oryzae (KCTC 6095) was studied. The UV lamp which emits maximum 14 watts at 254 ㎚ was set on the center of pyrex round glass tube. Two types of TiO_2, one of which is slurry and another which is thin film coated form, were used to determine the killing effect. When UV was irradiated to 1.7×10^5 cells/㎖ of E. coli for 11 min, the living cell number decreased to 4.0×10^0 cells/㎖. The effect of UV system together with slurried TiO_2 was less than 1 cells/㎖, whereas that of UV-coated TiO_2 system decreased to 7.1×10^3 cells/㎖. To study the effect of bubble on the killing of microorganisms, air was bubbled to the bottom of glass tube. When 1.7×10^5 cells/㎖ were exposed to UV for 11 min in combination with air bubble, the living cell number decreased to 1.3×10^2 cells/㎖. In the same condition except the addition of slurried TiO_2, the living cells were 1×10^2 cells/㎖. However, more cells could be killed by the system which consists of UV, coated TiO_2, and air bubble (7.9×10^1 cells/㎖). From these results, it was found that UV-slurried system is the most effective one, but its killing effect is not stimulated by air bubble. However, bubbling was very effective in the UV-coated TiO_2 system.