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면광원을 이용한 LCD 백라이트의 저온구동특성 향상을 위한 인버터 개발
허정욱,임성규,Hur, Jeong-Wook,Lim, Sung-Kyoo 한국마이크로전자및패키징학회 2007 마이크로전자 및 패키징학회지 Vol.14 No.1
수은의 방전을 이용하는 CCFL, EEFL, FFL은 그 특성상 상온에서의 구동 특성과 저온에서의 구동 특성이 매우 다르며, 그 결과 수은 증기압이 충분하지 않은 저온에서 구동 시 완전 점등하지 못하고 램프별로 또는 방전 채널별로 불 균일 점등이 발생할 수 있다. 이러한 저온 시동의 어려움을 해결하기 위해, 본 논문에서는 Level Control Block (LCB) 를 포함하는 인버터를 이용하여 저온 $-20^{\circ}C$에서 최대 130 Watt로 제한된 입력전력을 이용하여 외부 전극형 면광원 램프를 이용한 LCD 백라이트가 안정되게 동작될 수 있음을 확인하였다. The CCFLs, EEFLs and FFLs use mercury and the operating conditions are different at warm or cold temperature. At start of operation, there may exist a possibility of inhomogeneous operation of lamps or channels of FFL to the very low vapor pressure of mercury at low temperature. In this paper, an inverter with level control block (LCB) was developed to drive LCD backlight using FFL stably at low temperature range. The operation of FFL backlight at $-20^{\circ}C$ was successfully demonstrated by developing inverter with LCB under 130 Watt of power consumption.
채널 개수 및 길이에 따른 면광원 램프의 효율 비교에 관한 연구
허정욱,Hur, Jeong-Wook 한국반도체디스플레이기술학회 2009 반도체디스플레이기술학회지 Vol.8 No.2
Glass forming technology is used to form channels of external electrode flat fluorescent lamps (FFL). The efficiency of FFL depends on the number and the length of the channels. Five FFLs with same size ($300\;mm{\times}80\;mm$), different channel number, and different channel length were fabricated. The electrical and optical characteristics of 5 FFLs were evaluated. It was found that the FFL with one channel with its channel length of 1,110 mm and channel width of 7 mm corner width was shown to have the highest efficiency at room temperature operation.
면광원을 사용한 Scanning Backlight System의 설계 및 제작
채형준,허정욱,황선남,이준영,임성규,Chae, Hyung-Jun,Hur, Jeong-Wook,Hwang, Sun-Nam,Lee, Jun-Young,Lim, Sung-Kyoo 한국반도체디스플레이기술학회 2008 반도체디스플레이기술학회지 Vol.7 No.2
LCD panels are increasingly used to show moving image material, for example in LCD television sets. However, moving images become blurred on LCD panels. One of the causes of motion blur is the slow reaction of LC(liquid crystal) cell to change in the pixel value. Another cause of motion blur is the hold-type characteristic of the LCD panel, during the frame time the image is shown continuously. This type of motion blur can be reduced with a scanning backlight. We have designed and fabricated a scanning backlight system that solves the hold-type characteristic problem in a way that Flat fluorescent lamp divided 6 blocks was scanned 60Hz.
안성훈(Sung Hoon Ahn),박승국(Soong Kook Park),강영우(Young Woo Kang),이상곤(Sang Gon Lee),박경아(Kyung Ah Park),허정욱(Jeong Wook Hur) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.4
N/A With developement of noninvasive diagnostic test such as computed tomography (CT), ultrasongraphy and image-guided biopsies, the role of peritoneoscopy for the diagnosis of peritoneal carcinomatosis has been questioned. Retrospective study including 42 patients who were diagnosed as carcinomatosis peritonei by peritoneoscopic biopsy from July, 1980 to July, 1992 at Dongsan Hospital was done. Sixth decade was the most common age and sex distribution was relatively equal. The most common chief complaint was abdorninal distension (57.1%) and the nature of ascitic fluid was exudate in all cases. Of the 19 cases who were examined ascitic cytology, 13 cases (68.5%) were aborre class 3. 18 case.; (72%) were diagnosed as carcinomatosis peritonei on abdominal CT, while 7 cases (28%) as benign among 25 cases. The latter percent was similar to the poercent of the cases with even sized multiple small miliary nodules or flat lesions on peritoneoscopy which could be missed on abclominal CT. In conclusion, peritoneoscopy is still the precedure of choice for diagnosing carcinomatosis peritonei with a negative finding an imaging diagnostic test.
조성래(Sung Rae Cho),박경아(Kyung Ah Park),여준기(Joon Kee Yoe),박정모(Chung Mo Park),박근용(Geun Young Park),이인규(In Gyu Lee),허정욱(Jeong Wook Hur),안성훈(Sung Hoon Ahn),박승국(Soong Kook Park) 대한내과학회 1994 대한내과학회지 Vol.47 No.6
Objectives: Patients with chronic liver disease are at increased risk to develop metabolic bone disease. Although the etiology of the osteopathy in patients with primary biliary cirrhosis has not been defined, vitamin D deficiency and calcium malabsorption have been suggested as possible pathogenetic factors. In Korea, Patients with postnecrotic liver cirrhosis due to chronic hepatitis B are numerous, however, data on the prevalence and severity of osteopenia in these patient are rare. This study was performed to elucidate the mechanism of osteopenia and to examine its severity in postnecrotic liver cirrhosis. Methods: Thirty four patients with postnecrotic liver cirrhosis and thirty controls matched in age and sex were included in this study group. To obtain bone mineral density of lumbar spines in postnecrotic liver cirrhosis and control groups, measurements and comparisons of following tests were performed: Dual energy xray absorptimetry, serum calcium, serum osteocalcin, and serum 25 (OH) vitamin D. In addition, initial morning urine sample was collected to measure pyridinoline crosslinks. Results: 1) The average bone density of lumbar spines was 1.03±0.03 gm/cm² in postnecrotic liver cirrhosis group and 1.15±0.02 gm/cm² in normal controls (p<0.01). 2) The prevalence of osteopenia in the lumbar spine was 50% in postnecrotic cirrhotics compaired to 13% in controls. 3) The levels of serum calcium, 25 (OH) vitamin D and serum osteocalcin were 2.12±0.04 mmol/L, 7.38±1.00 ng/ml and 1.92±0.18 ng/ml in postnecrotic liver cirrhosis, 2.54±0.05 mmol/L and 21.68±1.90 ng/ml and 3.31±0.31 ng/ml in control group (p<0.05). 4) The levels of urinary pyridinoline crosslinks in postnecrotic liver cirrhosis and control were 82.87±7.50 nM/mM and 43.48±3.52 nM/mM, respectively (p<0.05). Conclusion: This study suggests that the incidence of lumbar osteopenia is more common in postnecrotic liver cirrhosis patients. In addition, its pathogenesis is related to vitamin D deficiency, decreased osteoblastic activity, and increased osteoclastic activity. Further studies including several hormones and histopathology of bones are needed to clearly define the mechanisms of osteopenia in postnecrotic liver cirrhosis.
박승국,허정욱,강영우,안성훈,이상곤 啓明大學校 醫科大學 1993 계명의대학술지 Vol.12 No.2
저자들은 1981년부터 1990년사이에 64,207명을 대상으로 내시경검사를 시행하여 8,814명에서 소화성궤양을 진단하여 다음과 같은 결론을 얻었다. 소화성궤양의 발생률은 13.7%였다. 위궤양과 십이지장궤양의 발생비는 1981년에는 1:0.9였으나 그후로는 1:1.1-1:1.5로 십이지장궤양의 발생비율이 높았다. 발생비율을 남녀별로 보면 위궤양의 경우에는 약 4:1 십이지장궤양은 3:1로 남자에서 많았다. 연령별로는 위궤양은 40대, 50대, 60대의 순서였고, 십이지장궤양은 30대, 40대, 20대 순으로 호발하였다. 위궤양은 위체부에서 대부분 발생하였다. In this century, very striking changes in incidence and prevalence of peptic ulcers, as well as in sexual proportion, in the age of the affected population and in the proportion of duodenal to gastric ulcers had occured and these epidemiological changes are ongoing. Therefore, we reviewed 8,814 cases with endoscopically proven peptic ulcers from 1981 to 1990. The results obtained are as follows; The prevalence of peptic ulcers among patients received endoscopy was 13.7%. The ratio of peptic ulcers among patients received endoscopy was 13.7%. The ratio of gastric ulcer to duodenal ulcer was 1: 0.9 in 1981, but after then the propotion of duodenal ulcer was higher in 1: 1.1-1:1.5. The ratio of male to female was about 4:1 in gastric ulcer and 3:1 in duodenal ulcer. The prevalence of gastric ulcer was highest in foruth decade and then fifth and sixth in order and the prevalence of duodenal ulcer was highest in thrid decade and then fourth and second decade in order. Most of the gastric ulcers were found at the gastric body.