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.

Therapeutic Effect of Dioctahedral Smectite on Diarrhea Caused by E. coli and Salmonella in Calves

Hu Jang Lee1,3*, Chun-Nam Cha, Yeo-Eun Lee, Hyunju Choi, Joon-Seob Shin, Suk Kim 충북대학교 동물의학연구소 2012 Journal of Biomedical and Translational Research Vol.13 No.2

The objectives of the current study were to evaluate the therapeutic effect of dioctahedral smectite (smectite) against calf diarrhea caused by pathogenic E. coli and/or Salmonella typhimurium. In this study, 20 calves (aged 2~3 months) with diarrhea were used for evaluation of the efficacy of smectite on calf diarrhea with 20% smectite suspension in PBS. Calves received 10 ml smectite suspension three times per day after feeding, and fecal samples were collected at the gate of treatment and on the first, second, third, fourth, and fifth day after administration. On the fifth day after treatment with smectite suspension, the diarrhea index showed a significant decrease in the treated group, compared to the control group (P<0.001). The number of pathogenic E. coli in feces of the treated group was significantly decreased, compared to each control group from the second day after treatment (P<0.001), and that of Salmonella typhimurium was significantly decreased from the first day after treatment (P<0.05). According to the results of the current study, 20% smectite suspension had a therapeutic effect on diarrhea caused by E. coli and/or Salmonella in calves.

치과 기공사들에게서 나타나는 호흡기 증상과 이의 관련 요인

김웅철,오세윤,김지환,김진완,이준석,이가영,이세훈,유진호,김태석 高麗大學校 倂設 保健大學 保健科學硏究所 2001 保健科學論集 Vol.27 No.1

This study was carried out to investigate subjective respiratory symptoms and their attributable factors in Korean dental laboratory technicians. A questionnaire was mailed to randomly selected 1,900 dental laboratory technicians. Among them, 1,344 dental technicians completed the questionnaires and returmned them. Validity and reliability tests on the questionnaires were carried out before the main survey. To investigate risk factors on respiratory subjective symptoms, we performed analysis on distribution of characteristics, and then investigated univariate analysis and multiple logistic regression analysis. The prevalence rate of wheezing, cough and phlegm, and dyspnea was 4.8%, 33.9%, 54.9%, respectively. Statistically significant factors inducing subjective respiratory symptoms by multiple logistic regression analysis were sex, smoking, exercise, health examination, work hours a day, investment gas, investment dust, metal fume, resin vapor, and asbestos dust. Considering the results above, it seems that most subjective respiratory symptoms are related with health habits and occupational environmental-related factors. The result, consideration in mind, suggest that health promotion programs for smoking cessation, regular health examination, and physical exercise in health habit, and improvement on casting and resin work in dental technological environment be necessary.

구미지역의 내수배제시설 설계를 위한 확률강우강도식의 유도

이재준,이정식,박종영,김석동 금오공과대학교 산업기술개발연구원 2000 産業技術開發硏究 Vol.16 No.-

This study is to derive the rainfall intensity formula based on the representative probability distribution of Kumi city in Korea. The 9 probability distributions which have been widely used in hydrologic frequency analysis are applied to the annual maximum rainfall. The parameters of each probability distribution are estimated by method of moments(MOM), maximum likehood method(MLE) and method of probability weighted moments(PWM). The estimated parameters were checked by parameter validity conditions of each assumed probability distribution. Four tests which are χ2-test, Kolmogorov-Smirnov test, Cramer von Mises test and PPCC test are used in this study to determine the goodness of fit of the distributions. The Gumbel distribution was determined as the representative probability distribution in Kumi city. Rainfall intensity formula was determined by linearization technique for the selected return periods.

미세혈관 수술후 Urokinase투여효과에 관한 실험적 연구

이세일,오석준,김용성,양경무 大韓成形外科學會 1987 Archives of Plastic Surgery Vol.14 No.1

However, even the most technically perfect anastomosis can neither eliminate the damage which microneedles cause on the vascular endothelium nor foreign body reaction to the suture material. Thrombosis developed at the suture site and regressed if the stimulus for the thrombosis is not severe. Partial thrombosis was inevitable after microvascular anastomosis. Since systemic thrombolytic drugs were used initially in the management of pulmonary emboli, urokinase were also used in prevention of thrombolysis and thrombolysis after microvascular anastomsis. This experimental study includes the effect of urokinase on the microvascular anastomosis in rabbits. The patency was observed, and platelet count, fibinogen, prothrombin time, and activated partial thromboplastim time were examined. In the case of thromboses, the anastomotic sites were resected and examined microscopically. The results were as follow; 1. The patency rate was increased 15 percent in experimental group than control group. 2. There were no differences in platelet count and the prothrombine time between experimental and control group. 3. The level of fibrinogen was decreased 157㎎/dl in experimental group less than control group. 4. The activated partial thromboplastin time was increased three to four times at postoperative period more than preoperative period in experimental group. 5. In light microscopic examination of thrombotic vessel wall revealed inflammatory reaction to suture material. In the experimental group, the thrombi were loose and defibrinated than control group.

양측에 발생한 외상성 내경동맥 해면정맥동루

이학준,장석정 조선의대 1996 The Medical Journal of Chosun University Vol.21 No.2

몇가지 生長調節物質과 物理的 處理가 자귀나무의 種子發芽에 미치는 影響

李宗錫,洪俊淑 제주대학교 1984 논문집 Vol.18 No.-

우리나라에서 自生하는 자귀나무(Albizzia julibrissin Durazz)의 種子發芽에 미치는 몇가지 生長調節物質과 種皮의 物理的 處理效果는 다음과 같다. 1. 生長調節物質의 種類에 따른 濃度別 處理 效果는 藥劑의 種類에 따라서 서로 달랐는데 GA는 500 ppm, IAA는 100ppm, BA는 1ppm이 가장 效果的이었고 AC 99,524는 5∼2,000ppm의 範圍에서 發芽를 促進하였고 發芽率도 높았으나 Ethrel 處理는 發芽를 抑制시켰다. 2. 種皮에 破傷處理한 種子는 發芽率이 90%이었으나 無處理 種子는 5%에 不過하였다. 3. 50℃의 溫湯에 各各 30分과 60分間 沈積處理한 것이 發芽率이 높았고 發芽도 빨리 되었다. 4. 濃黃酸에 沈積處理한 種子는 顯著하게 發芽率이 增加되었는데 特히 30分間 處理하는 것이 가장 效果的이었다. This experiment was carried out to study the effects of several growth regulators and physical treatments on seed germination of Albizzia julibrissin plant native to korea. The most effective concentrations in the chemicals for germination were 500 ppm GA, 100 ppm IAA, 1 ppm BA and AC 99,524 ranged from 50 ppm to 2,000 ppm respectively, but the germination was inhibited by application of Ethrel. Germination ratio was about 90% by scarification of the seed coat compared with 5% of non-treated seeds. The seeds soaked in hot water at 50℃ for 30 or 60 minutes were enhanced germination ratio, and were shortened the days for germination. And the seeds treated with concentrated sulfuric acid were markedly promoted the germination, however the most effective treatment time was 30 minutes.

분절간 척추경 나사 고정과 척추전이법을 이용한 특발성 척추 측만증의 치료

석세일,김진혁,이상민,정의룡,김성수,이정희,박준석 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.2

Objective : To report the clinical result of segmental pedicle screw fixation and translation technique in surgical correction of idiopathic scoliosis. Methods and materials : Ten idiopathic scoliosis. patients treated with segmental pedicle screw fixation and translation technique were analyzed retrospectively. The mean follow-up interval was 23.8months, with a minimum of 12 months. Eighteen structural curves were fused in one double curves(King type Ⅰ), seven double thoracic curve(King type Ⅴ) and two thoracolumbar curve. Deformity correction, apical vertebral rotation(AVR), apical vertebral translation(AVT), trunk balance, shoulder balance and complications were evaluated. Result : The structural curve was corrected from 47.4±10.6° to 20.3±5.9° at 1week after surgery and 55.6±14.1° at latest follow-up. AVR was corrected from 2.06±0.4 to 0.94±0.41 at 1week after surgery and latest follow-up. AVT was improved from 25±15.7㎜ to 11.5±7.3㎜ at 1week after surgery and 12.3±7.3㎜ at latest follow-up. There were no trunk imbalance(less than 10㎜ distance from C7 plumb line), no shoulder imbalance(less than 10㎜ shoulder height difference) and no screw related complications. Conclusions : The segmental pedicle screw fixation and translation technique is an effective method in treating for idiopathic scoliosis.

韓國證券市場에서 內部者의 收益性에 관한 硏究

李埈碩,趙正元 동아대학교 경영대학 1994 經營硏究 Vol.- No.8

The protection of inverstors is very important for the development of the stock market. Above all, insider trading is one of the most important issues. Numerous previous studies of insider trading have appeared in the past 20 years. Most of them have concluded that corporate insiders earn abnormal returns on their stock transactions. But recent study concluded that insiders could not expert abnormal returns on insider trading if considered the transaction cost. Therefore, this study analyzes empirically whether insiders earn abnormal returns through insider trading in Korean stock market. The analysis was conducted with the rate of stock price per days (from days -40 to +40) during the periods of Nov. 1, 1989-Oct. 31, 1990. The sample of 112-firms are selected. The methodology employed is a residual analysis, which is commonly used in event studies, on the basis of the model of Market-Adujusted Return Method and T-test is used to test significance of residual analysis. The results of analysis are summarized as follows. First, there appears that insider earned an abormal returns over the average returns after their stock sales. This means that insider have higher forecasting power than the general investors aid have more information to affect the price of stock. Second, there appears that, insider have suffered losses under the average returns after their purchase. This shows insider, in fact, purchase stocks using not only undisclosed informations but also other motivation. Third, according to results of analysis using all sample, there appears that insiders have suffered losses under the market average returns after their stock trading. This show that insiders could buy or sell stocks using motivation rather than the information undisclosed to the general investors.

한글ㆍ영문 겸용 Word Processor System 개발에 관한 연구

이상인,강석건,서창렬,신태민,박규태,여재준,장이한 연세대학교 산업기술연구소 1984 논문집 Vol.16 No.2

The design theory and implementation of a word processor system with more efficient processing of Korean and English text are studied. A screen editing method is implemented which is more flexible to handle the texts. Convinient control of the keyboards, cursors moving, texts editing, line marking and block operations are considered. The codes to avoid the complexity and inefficiency which are caused by difference of the code length between the Korean and English characters are reconstructed. File management systems and algorithms for executing the control commands are also studied. As a result, a successful word processor system is designed and implemental which performs a complete screen editing system. The performance of the system includes flexible cursor movement, margin setting, block operations of insertion, deletion and copying any sizes of the line and blocks; and also, the printout routines for size variation of the characters are worked out.