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초고속 광통신용 Avalanche photodiode의 제작 및 특성에 관한 연구
유지범,박찬용 成均館大學校 科學技術硏究所 1994 論文集 Vol.45 No.2
We review the characteristics of Avalache photodiode(APD) for long haul and high bit- rate optical fiber communication system including basic operating principle, excess noise factor, and bandwidth, and we also summarize recent progress. Separate absorption garding, charge and multiplication APD with charge plate layers instead of guard ring was designed and fabricated using metalorganic chemical vapor deposition and reactive ion etching technique. APD shows 37∼48V of breakdown voltage and very low dark current less than 10 nA at 90% of breakdown voltage. Receiver consisting of APD and Ga As pre - amplifier shows sensitivity of - 33.6dBm in the application of the pseudorandom 2^23-1 non- returen- to- zero(NRZ) patterns at 10^-9 bit error rate(BER).
Systemic Lupus Erythematosus를 동반한 Multiple sclerosis
이지현,이기주,윤성호,부귀범,손현화,박유환,정춘해,김진호,정원영 조선대학교 부설 의학연구소 1998 The Medical Journal of Chosun University Vol.23 No.2
Multiple sclerosis and lupus erythematosus are chronic, potentially disabling diseases of unknown cause. It is a rare occasion that the finding of both diseases occurs in one patient. Because both diseases may affect the central nervous system, it may be difficult at times to differentiate symptoms of lupus erythematosus from those of multiple sclerosis. As far as we know, there was no case report of SLE in multilple sclerosis in Korea. We report a case of multiple sclerosis accompanied by SLE.
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).
Genome-Wide Association Study of Rice Core Set Related to Grain Weight
( Buung Choi ),( Ji-min Yoo ),( Sang-beom Lee ),( Gyeong-jin Kim ),( Kyu-won Kim ),( Ji-hyock Yoo ),( Kyeong-seok Oh ),( Byeong-churl Moon ),( Wook-han Kim ),( Yoo-hyun Cho ),( Sang-won Park ),( Yong- 한국육종학회 2018 Plant Breeding and Biotechnology Vol.6 No.3
Rice is being consumed in over 50% of the world's population, and it is main food in Korea. Many accessions of rice have been utilized for breeding purposes such as the use for functional food, disease resistance, improved quality and yield. In this study, the 1000-grain weight, one of important components for yield in rice, was investigated and analyzed by conducting a genome-wide association study (GWAS) using whole genome SNP genotype data on 295 Korean rice core sets. Four genes, Os01g0315700, Os03g0604566, Os04g0413500 and Os05g0216950, are significantly associated with 1000-grain weight. We presume carefully that the function of these kind genes will help in the selection of intermediate parents with high yield and genetic markers to develop new varieties.
( Ji Yeon Hong ),( Won Jong Oh ),( Kwang Ho Yoo ),( Kapsok Li ),( Beom Joon Kim ),( Chang Kwun Hong ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Thread lifting has become increasingly popular both for physicians and patients for its advantages in limited scarring, rapid recovery, and minimal complications compared with the incisional surgery. The usage of nonabsorbable polypropylene thread has especially been favored because of its durability. A 45-year-old woman presented with a protruding mass on the left temporal area for 2 years. She had a history of thread lifting 8 years ago. Histologic examination of biopsy specimen revealed a dense inflammatory cells`` infiltration in the dermis. This case emphasizes the importance of consistent and long-term follow-up evaluations to determine whether thread lifting causes delayed type complications.
Comparison of Clinico-Physiologic and CT Imaging Risk Factors for COPD Exacerbation
Yoo, Jung-Wan,Hong, Yoonki,Seo, Joon Beom,Chae, Eun Jin,Ra, Seung Won,Lee, Ji-Hyun,Kim, Eun Kyung,Baek, Seunghee,Kim, Tae-Hyung,Kim, Woo Jin,Lee, Jin Hwa,Lee, Sang-Min,Lee, Sangyeub,Lim, Seong Yong,Sh The Korean Academy of Medical Sciences 2011 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.26 No.12
<P>To date, clinico-physiologic indices have not been compared with quantitative CT imaging indices in determining the risk of chronic obstructive pulmonary disease (COPD) exacerbation. We therefore compared clinico-physiologic and CT imaging indices as risk factors for COPD exacerbation in patients with COPD. We retrospectively analyzed 260 COPD patients from pulmonary clinics at 11 hospitals in Korea from June 2005 to November 2009 and followed-up for at least one year. At the time of enrollment, none of these patients had COPD exacerbations for at least 2 months. All underwent clinico-physiologic and radiological evaluation for risk factors of COPD exacerbation. After 1 yr, 106 of the 260 patients had at least one exacerbation of COPD. Multiple logistic regression analysis showed that old age, high Charlson Index, and low FEV<SUB>1</SUB> were significant in a clinico-physiologic model, with C-statistics of 0.69, and that increased age and emphysema index were significant in a radiologic model, with C-statistics of 0.64. The difference between the two models was statistically significant (<I>P</I> = 0.04 by bootstrap analysis). Combinations of clinico-physiologic risk factors may be better than those of imaging risk factors in predicting COPD exacerbation.</P>
Disposable MEMS optrode array integrated with single LED for neurostimulation
Yoo, Sunghyun,Lee, Hongkyun,Jun, Sang Beom,Kim, Yong-Kweon,Ji, Chang-Hyeon Elsevier 2018 Sensors and actuators. A Physical Vol.273 No.-
<P><B>Abstract</B></P> <P>We present an LED-waveguide-based neural probe array with the highest total light power delivery from a single commercial LED. A separable configuration between the LED and the waveguide has been proposed and verified experimentally for a disposable probe tip. The system comprises of a disposable MEMS optrode array and a reusable unit. The optrode array consists of a 4 × 4 array of 6 mm-long optical fibers assembled with thermally reflowed square-shaped glass microlenses. The reusable unit includes a domed top LED and driving circuitry. Measured light delivery efficiency of the optrode array and the total power efficiency of the probe were −10.6 dB and −21.6 dB, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An LED-waveguide-based neural probe array using single commercial μLED presented. </LI> <LI> System comprises of a disposable MEMS optrode array and a reusable unit with μLED and circuitry. </LI> <LI> A 4 × 4 array of 6 mm-long optical fibers are assembled with thermally reflowed square-shaped glass microlenses. </LI> <LI> Delivered optical power and light delivery efficiency analyzed. </LI> </UL> </P>
( Ji Oh Mok ),( Chan Hee Jung ),( Chul Hee Kim ),( Chang Beom Ryu ),( Yeo Joo Kim ),( Sang Jin Kim ),( Hyeong Kyu Park ),( Kyo Il Suh ),( Myung Hi Yoo ),( Dong Won Byun ) 대한내과학회 2013 The Korean Journal of Internal Medicine Vol.28 No.6
Background/Aims: This study was performed to compare the mucosal findings after esophagogastroduodenoscopy in two groups before and after the use of alendronate only and following administration of the enteric-coated alendronate (5 mg) and calcitriol (0.5μg) combined drug (Maxmarvil, Yuyu Co.). Methods: The study population consisted of 33 postmenopausal healthy female volunteers, aged 50 to 70 years (mean age, 58 ± 5) without gastrointestinal symptoms and with normal baseline endoscopic findings. Esophagogastroduodenoscopy was performed at baseline and was repeated 2 weeks later after daily intake of Maxmarvil (n = 17 subjects) or alendronate only (n = 16 subjects). Mucosal injury scores were reported by an endoscopist after 2 weeks of treatment with each medication schedule. Results: Esophageal mucosal injuries developed in two of 16 subjects in the alendronate only group and 0 of 17 in the Maxmarvil group. Gastric mucosal injuries developed in eight subjects in the alendronate group and four subjects in the Maxmarvil group; this difference was statistically significant. Conclusions: The mucosal damage scores for the alendronate group (total score 24) were significantly higher than those for the Maxmarvil group (total score 9) in the esophagus and stomach. Therefore, this study suggested that enteric-coated Maxmarvil is less harmful to gastrointestinal mucosa than alendronate, and may improve the tolerability of osteoporosis medication in clinical practice.
Depression and Anxiety in Korean Patients with Chronic Obstructive Pulmonary Disease
( Ji-Yong Moon ),( Tae-Hyung Kim ),( Yeon-Mok Oh ),( Joon Beom Seo ),( Kwang Ha Yoo ),( Ji-Hyun Lee ),( Eun Kyung Kim ),( Seunghee Baek ),( Woo Jin Kim ),( Jin Hwa Lee ),( Sang-Min Lee ),( Sang Yeub L 대한결핵 및 호흡기학회 2012 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.114 No.0
Background: Depression and anxiety are common comorbidity in COPD patients, and they could have potential impact on clinical outcomes of COPD. Objective: We assessed the prevalence of depression and anxiety in Korean COPD patients, and also investigated whether co-morbid depression or anxiety show clinical differences in the course of COPD. Methods: Using Korean Obstructive Lung Disease (KOLD) Cohort from 15 university hospitals in Korea, we analyzed the prevalence of depression and anxiety by using Beck Depression Inventory (BDI) and Beck Anxiety Inventory (BAI). We also compared demographic data, comorbidity, lung function, frequency of acute exacerbation, mortality related or unrelated with COPD, emphysema index and quality of life measured with St George Respiratory Questionnaire for COPD patients (SGRQC) between depression or anxiety patients with non-depression or non-anxiety patients, respectively. Results: Among 217 patients with COPD, the prevalence of depression and anxiety were 37.8% and 27.2%, each. Depression and anxiety were closely correlated with each other. Patients with depression or anxiety had higher BODE index, higher SGRQC score and more frequent acute exacerbation for following 3 years. After controlling for confounders including age, sex and BODE index, presence of depression or anxiety had no significant impact on frequency of acute exacerbation. Conclusion: Based on BDI and BAI, depression and anxiety are common in Korean patients with COPD, and may influence variable aspects of COPD.
( Ji Yeon Hong ),( Joon Hyuk Suh ),( Kwang Ho Yoo ),( Kui Young Park ),( Heesu Kim ),( Beom Joon Kim ),( Myeung Nam Kim ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
Nodules are frequently observed after soft tissue augmentation. Chronic and intractable nodules that persist for months despite such procedures may become increasingly fibrotic, and thus require excision due to the possibility of foreign body granuloma. A 48-year-old female presented with multiple skin-colored nodularities on her forehead. She had received hyaluronic acid (HA) filler injections for forehead volume augmentation one year prior. The patient was treated using a minimally invasive intradermal needle RF device twice at 1-week intervals. The treatment resulted in significant improvement of the forehead contour. We suggest bipolar RF as an effective and safe treatment method for implant nodules.