디지탈 멀티비젼 ASIC의 설계

류지구,최혁환,차영호,김정헌,조경연 釜慶大學校 1997 釜慶大學校 論文集 Vol.2 No.2

The wide spread of multimedia sysrem deands a large viewing display device which can inform a message to many peoples in open area. This paper is about the design and simulating of a large viewing digital multi-wision control ASIC(Application Specific Integrated Circuit). In this paper. the digital multi-vision ASIC has one channel of imput cideo signal wihich is compliance with CCIR-656 specification and four channels of output video signal which are compliance with CCIR-601 specificarion. It has 2 operating mode. The one is the pass-thro;ugh mode. input vido signal goes to output video signal without any change, and the another one is the expension mode, input video signal is expended by from 2 to 16 times into output video signal. In expension mode. awindow could be programmed and only the input video signal in the window is expended. The 0.6 micron CMOS sEA OF Gate is used to design the ASIC in amount of about 23,000 gates, and it is simulated at 48MHz.

11β-수산화효소 결핍에 의한 선천성 부신증식증 1예

류옥현,류혜진,박수연,권순범,박상수,김희영,이계원,서지아,오정헌,김신곤,김난희,최경묵,백세현,최동섭 대한내분비학회 2004 Endocrinology and metabolism Vol.19 No.1

저자들은 국내에서 처음으로 음핵 비대와 지속적인 질출혈을 주소로 내원한 19세 여성에서 고혈압이 동반되지 않으면서 11 -수산화효소 결핍으로 인한 선천성부신증식증을 경험하였기에 문헌 고찰과 함께 이를 보고하는 바이다. Congenital adrenal hyperplasia refers to a group of autosomal recessive disorders that is defective in the synthesis of cortisol. The enzymes most often affected are 21-hydroxylase and 11 - hydroxylase. The low levels of cortisol stimulate the pituitary gland to release ACTH. Chronic elevation of the ACTH level causes bilateral adrenal hyperplasia and a secondary increase in androgen formation. We examined a 19 year-old woman presented with clitoral hypertrophy and vaginal spotting. The subjects basal level of serum cortisol was low, but the serum levels of ACTH, 17a-hydroxyprogesterone, deoxy-corticosterone were elevated. The urinary excretions of 17-ketosteroids and 17-hydroxycorticosteroids were also increased. The karyotyping study and transrectal ultrasonography showed normal findings. The patient underwent clitoris reduction surgery and received hydrocortisone. To the best of our knowledge, this is the first case of 11 -hydroxylase deficiency in Korea (J Kor Soc Endocrinol 19:58∼63, 2004).

잡음 및 오프셋전압 감소를 위한 종형 홀소자의 교류구동

김정헌,류지구,송명희 釜慶大學校 1998 釜慶大學校 論文集 Vol.3 No.2

In this paper, the Alternating Current(AC) driving method of Vertical Hall Device(VHD) which is sensitive to the magnetic field parallel to the surface of the chip is presented. This system consists of the phase inverting circuit and Low Pass Filter(LPF) ect. for the amplification of Hall voltage and reduction of offset voltage and noise. When this system was operated, the offset voltage and noise could be reduced effetively. Also, the output voltage of VHD was ±74.0〔mV〕 in the low magnetic field ranges of ±100〔Gauss〕, the linearity of output voltage were good, and the magnetic field resolucation was 0.74〔mv/Gauss〕.

증류수와 인공타액에서 충전용 글래스 아이오노머 시멘트의 불소유리량에 대한 평가

김경남,이진숙,류지헌 大韓齒科器材學會 1994 대한치과재료학회지 Vol.21 No.2

The purpose of this study was to compare the amount and pattern of fluoride release from restorative cements into de-ionized water with that in artificial saliva . Three light-curing glass ionomers , a water-setting glass ionomer⁴, two conventional glass ionomers and a resin-based material were selected. Sixteen cylindrical samples(6.5mm×2.5mm)of each cement were prepared. Each was individually suspended in 5ml of either de-ionized water or artificial saliva(eight samples in each medium) and stored at 37℃. The media were changed and fluoride concentration was measured with fluoride electrode for 90 days. The data showed that: (1) Cumulative fluoride release from Ketac-Fil, Dyract and VariGlass VLC into the artificial saliva was significantly less than in de-ionized water(p<0.05) as tested by ANOVA. The cumulative amounts of fluoride into the saliva were 2.52, 0.10 and 0.65 ㎎F /㎤. And they accounts for 49%, 14% and 84% of the amounts into de-ionized water respectively; (2) Ketac-Fil released more fluoride than other materials in both media(p<0.001). Vitremer, Iono Gem, and Dyract released 37%, 38%, and 13% of the cumulative amount of fluoride from Ketac-Fil into deionized water, respectively, but they released 73%, 78%, and 4% of that into artificial saliva, respectively. It is concluded that the release of fluoride from some restorative glass ionomers is highly variable according to the medium in which glass ionomer is stored, and so artificial saliva should be used to test fluoride release of restorative glass ionomer cements.

만성 C형 간염 환자에서 페그인터페론 알파2a와 리바비린 병합 치료중 발생한 벨마비 1예

김일환,장제혁,유충헌,최규남,고정해,김윤정,서광원,김지현,박성재,박은택,이연재,이상혁,설상영 인제대학교 2008 仁濟醫學 Vol.29 No.-

페그인터페론과 리바비린 병합요법은 만성 C형 간염의 일차 치료법이다. 저자들은 만성 C형 간염 환자에서 페그인터페론 과 리바비린 병합 요법 중에 발생한 벨마비 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다. 환자는 5년 전부터 만성 C형 간염을 앓아온 48세 남자이며, PEG-IFN α-2a 135μgm 피하주사 주1회와 하루 1200㎎의 리바비린을 투여하였다. 치료시작 후 9개월째 환자는 오른쪽 안면의 근력약화를 호소하였으며 벨마비로 진단되었다. 페그인터페론과 리바비린 병합요법을 지속하면서 관찰하였다. 환자의 벨마비는 페그인터페론 치료를 중단하지 않았음에도 3개월후 증상이 회복되고 이후 벨마비 재발 없이 현재 경과관찰 중이다. 만성 C형 간염에서 페그인터페론과 리바비린 병합 요법시 벨마비의 발생 가능성을 염두에 두어야 하겠다. A Case of Bell's Palsy Associated with Combination Therapy of Pegylated Interferon Alfa-2a (PEG-IFN) and Ribavirin for Chronic Hepatitis C Virus Infection Pegylated interferon alfa(PEG-IFN α) and ribavirin therapy is the first line treatment for chronic hepatitis C. Mild complications of the therapy are common, but more serious complications are rare. We report here a case of Bell's palsy that occurred in a patient with chronic hepatitis C virus infection during combination therapy of PEG-IFN α-2a and ribavirin. The patient was 49-year-old man with chronic hepatitis C (genotype 1b) for 8 years. He had compensated liver cirrhosis with splenomegaly. Therapy with PEG-IFN α- 2a 135mcg/week and ribavirin 1200mg/day was initiated. After 9 months of the therapy, the patient showed a loss of muscular tone on the right side of his face. A diagnosis of Bell's palsy was made. The Bell's palsy resolved over 3 months despite continuation of the combination therapy.

저자계측정을 위한 종형 Hall 소자의 교류구동 원리

송명희,김정헌,박용우,류지구 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

In this paper, the vertical Hall device which is sensitive to the magnetic fields parallel to the surface of the chip, is fabricated and characterized. The Hall voltage was ±0.2[mV] in the range of ±100[Gauss]. The current-related Magnetic sensitivity(S_(H)) was about 55[V/AT]. With an increased I_(sup), the offset voltage was also increased. Alternating Current(AC) driving system was used to process the amplification of Hall voltage and the reduction of offset and noise by the AC driving of the vertical Hall device. When the AC driving system was operated, the output of the Hall voltage was ±74.0 [mV] in the low magnetic field ranges of ±100 [Gauss], The magnetic fields resolution was 0.74[mV/Gauss].

고삼투압성 비케톤성 상태의 예후인자

안성훈,김양원,김미란,진헌철,안지영,이상래,류석용,김홍용,김성준,이병권,김경환 대한응급의학회 2001 대한응급의학회지 Vol.12 No.2

Background: A hyperosmolar nonketotic state has been known to have a high mortality, and even now, despite this high mortality, only a few studies of this disease have been performed. We studied the prognostic factors for the hyperosmolar nonketotic state. Methods: We retrospectively studied the cases of 40 patients who were in a hypersomolar nonketotic state when admitted to Sanggye Paik Hospital during the 6-year Period from 1995 through 2000. We divided the hyperosmolar nonketotic patients into two groups, the complete recovery group and the incomplete recovery group, and compared the clinical features, the laboratory findings, and the precipitating factors between two groups. Results: 1) A total of 40 patients were studied: 24 in the complete recovery group and 16 patients in the incomplete recovery group. The mortality rate was 32.5%. 2) No significant statistical difference existed among the clinical features of the two groups, except for the sex(p<0.01). 3) Among the laboratory findings of both groups, analysis revealed that the effective osmolarity was significantly higher among those in the incomplete recovery group(p<0.01). Serum sodium concentration was also significantly higher among those in the incomplete recovery group(p<0.01). Serum creatinine was also significantly higher among those in the incomplete recovery group(p<0.05). Serum bicarbonate concentration, on the other hand, was significantly lower among those in that group(p<0.05).4) Infection was identified as the most common precipitating factor(62.5%). Among the precipitating factors of the two groups, there were significant statistical difference in pneumonia, UTI, and inappropriate glucose control. 5) A significant statistical difference existed among the initial level of consciousness of both groups(p<0.05). 6) The only significant independent factor responsible for prognosis of nonketotic hyperosmolar state patients was the sex. Conclusion: The sex was only significant independent prognostic factor of nonketotic hyperosmolar state patients.

Polarization Behavior of Li₄Ti₅O₁₂ Negative Electrode for Lithiumion Batteries

Ryu, Ji-Heon The Korean Electrochemical Society 2011 Journal of electrochemical science and technology Vol.2 No.3

$Li_4Ti_5O_{12}$ is prepared through a solid-state reaction between $Li_2CO_3$ and anatase $TiO_2$ for applications in lithium-ion batteries. The rate capability is measured and the electrode polarization is analyzed through the galvanostatic intermittent titration technique (GITT). The rate characteristics and electrode polarization are highly sensitive to the amount of carbon loading. Polarization of the $Li_4Ti_5O_{12}$ electrode continuously increases as the reaction proceeds in both the charge and discharge processes. This relation indicates that both electron conduction and lithium diffusion are significant factors in the polarization of the electrode. The transition metal (Cu, Ni, Fe) ion added during the synthesis of $Li_4Ti_5O_{12}$ for improving the electrical conductivity also greatly enhances the rate capability.

도수 소생기와 풍선을 이용한 공기 누적이 폐 기능에 미치는 즉각적인 효과 비교

류지윤 ( Ji-yun Ryu ),이동엽 ( Dong-yeop Lee ),홍지헌 ( Ji-heon Hong ),김진섭 ( Jin-seop Kim ),김성길 ( Seong-gil Kim ) 대한통합의학회 2021 대한통합의학회지 Vol.9 No.1

Purpose : To compare the immediate effects of air stacking maneuver using resuscitator bags and balloons. Methods : Twenty healthy young adults participated in this study. Forced vital capacity (FVC) and peak cough flow (PCF) tests were performed at pre-intervention, and then, the maximum insufflation capacity (MIC), forced expiratory volume in 1 s (FEV₁), FEV₁/FVC, peak expiratory flow (PEF), and peak cough flow (PCF) were measured using the air stacking maneuver via resuscitator bags and balloons. Interventions were randomly performed, and a 40-min break was provided between interventions. The evaluation process in this study was conducted in accordance with the guidelines of the American Thoracic Society (ATS) 2019. To compare the three outcomes measured at pre-and post-interventions, repeated measures analysis of variance was performed. Results : A significant difference was found in the MIC, FEV₁, PEF, and PCF after the air stacking maneuver using resuscitator bags and balloons, whereas no significant difference was observed between resuscitator bags and balloons. Conclusion : No significant difference was found in the immediate effect of the air stacking maneuver using resuscitator bags and balloons in this study. Air stacking maneuver using balloons can increase the success rate of the techniques by providing visual feedback on the amount of air insufflation when performed with balloon blowing exercise. Balloons are cheaper and easier to buy compared to manual resuscitator bags; therefore, education on the air stacking maneuver using balloons will have a positive effect on pulmonary rehabilitation.

미이용 부산물의 재활용을 위한 과수 전정목의 원료화 연구

류정헌(Jeong-Heon Ryu),김철환(Chul-Hwan Kim),이지영(Ji-Young Lee),박진화(Jin-Hwa Park),이청하(Chung-Ha Lee),이지수(Ji-Su Lee) 한국펄프·종이공학회 2022 한국펄프·종이공학회 학술발표논문집 Vol.2022 No.10