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A Study on New PDP Drive Circuit with Low Voltage Device Stresses
Nam, Won-Seok,Roh, Chung-Wook,Hong, Sung-Soo,Sakong, Sug-Chin 국민대학교 생산기술연구소 2004 공학기술논문집 Vol.27 No.-
A new energy-recovery-sustain circuit suitable for a plasma display panel (PDP) application is proposed. The proposed circuit features the low device voltage/current stresses, and the inherent circulating current elimination characteristics, essential to design a power efficient and low cost plasma display driver circuit. The proposed circuit is demonstrated experimentally for driving a 42 inches plasma display panel. It is best suited in a low cost and power efficient plasma display This work was supported in part by Core Technology R&D Group, Samsung Electronics Co., Ltd.
P232 : Clinical and pathological study of seborrheic keratosis in Korean patients
( Nam Kyung Roh ),( Hae Jeong Youn ),( Min Jung Kim ),( Soo Young Kim ),( Ho Jung Jung ),( Yu Ri Kim ),( Yu Na Lee ),( Jae Wook Jung ),( Yang Won Lee ),( Yong Beom Choe ),( Kyu Joong Ahn ) 대한피부과학회 2014 대한피부과학회 학술발표대회집 Vol.66 No.2
Background: Seborrheic keratosis (SK) is one of the most common epidermal tumors of the skin that may occur singly or more often in multitude. Histologically, SK is divided into six major variants; acanthotic, hyperkeratotic, adenoid, irritated, clonal, and melanoacanthoma. However, investigation of histopathological subtypes and sites of the SKs to detect any possible correlations have been rarely documented. Objectives: To analyze the clinical and histopathological features of a large number of cases of SK diagnosed in Korean patients. Methods: Total of 271 pathology slides of clinically diagnosedSK and 206 cases of biopsy-proven SK were analyzed. Cases of biopsy-proven SK were assessed for histopathologicalsub-classification. Results: The most frequent histopathological subtype was the acanthotic type, followed by hyperkeratotic, melanoacanthoma, clonal, irritated type, and adenoid types. Of them, adenoid type was more common in sun-exposed site than sun-protected site. Overall, premalignant and malignant entities together represented 24.2% of the clinic-pathological mismatch cases. The frequency of a mismatch for the sun-exposed area was significantly higher than that of the non-sun exposed area (p=0.043). Conclusion: Adenoid type was more common in sun-exposed area. High frequency of mismatch is associated with SKs situated on sun-exposed area. We should take a biopsy particularly in lesions situated on sun-exposed area to exclude either premalignant or malignant diseases.
( Nam Kyu Kang ),( Jung Wha Chung ),( Hee Yoon Jang ),( Dong Won Park ),( Eun Sun Jang ),( Jin-wook Kim ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: Hepatitis B virus (HBV) DNA levels and HBsAg titer have been implicated as a predictor of the risk for hepatocellular carcinoma (HCC) in chronic hepatitis B (CHB). Potent nucleos(t)ide analog therapy improves not only biochemical and virologic profiles but also the long-term prognosis of CHB. However, it is not certain whether HBV DNA and HBsAg titer still retain prognostic value in CHB on potent NA therapy. This study investigated whether pre-treatment HBsAg titer and HBV DNA levels can predict the risk of HCC development in CHB patients receiving entecavir therapy. Methods: This retrospective cohort study included 1,246 CHB patients who received entecavir and HCC surveillance from three referral centres in Korea. Baseline HBsAg titers and HBV DNA levels were analyzed by Kaplan-Meier method and log-rank test to calculate the cumulative incidence rates of HCC and compare them according to HBsAg and HBV DNA levels. Independent risk predictors of HCC were identified by Cox proportional hazard modeling. Results: The cumulative incidence of HCC during observation period was 1 %, 10.2%, and 51.8 % at 1, 5 and 9 years, respectively (9.6 per 1000 person-years). The baseline HBsAg titer and HBV DNA levels were 4311.4 (IQR = 2.9 - 9683) and 5.7 logIU/ml (IQR = 1.4 - 8.8461), respectively. The risk of HCC was higher in patients with HBsAg titer ≥ 5000 IU/L than in those with HBsAg titer < 5000 IU/L (P=0.002), whereas higher baseline DNA levels were not associated with higher risk for HCC ( > 5.7 vs <5.7 LogIU/ml; p = 0.166). Old age, male sex and presence of cirrhosis were also associated with increased HCC risk. Multivariate Cox analysis showed that HBsAg lost significance [HR = 1.26 (0.59-2.65)], whereas old age, male sex and presence of cirrhosis still predicted HCC risk as independent factors. Conclusions: In the era of potent NA therapy, baseline virologic parameters no longer have significant impact on the prediction of HCC development in addition to conventional clinical predictors. Additional predictors are needed for correct prediction of the HCC risk in CHB.
Robotic single-port transumbilical total hysterectomy: a pilot study
Nam, Eun Ji,Kim, Sang Wun,Lee, Maria,Yim, Ga Won,Paek, Ji Heum,Lee, San Hui,Kim, Sunghoon,Kim, Jae Hoon,Kim, Jae Wook,Kim, Young Tae Korean Society of Gynecologic Oncology and Colposc 2011 Journal of Gynecologic Oncology Vol.22 No.2
<P><B>Objective</B></P><P>To evaluate the feasibility of robotic single-port transumbilical total hysterectomy using a home-made surgical glove port system.</P><P><B>Methods</B></P><P>We retrospectively reviewed the medical records of patients who underwent robotic single-port transumbilical total hysterectomy between January 2010 and July 2010. All surgical procedures were performed through a single 3-4-cm umbilical incision, with a multi-channel system consisting of a wound retractor, a surgical glove, and two 10/12-mm and two 8 mm trocars.</P><P><B>Results</B></P><P>Seven patients were treated with robotic single-port transumbilical total hysterectomy. Procedures included total hysterectomy due to benign gynecological disease (n=5), extra-fascial hysterectomy due to carcinoma <I>in situ</I> of the cervix (n=1), and radical hysterectomy due to cervical cancer IB1 (n=1). The median total operative time was 109 minutes (range, 105 to 311 minutes), the median blood loss was 100 mL (range, 10 to 750 mL), and the median weight of the resected uteri was 200 g (range, 40 to 310 g). One benign case was converted to 3-port robotic surgery due to severe pelvic adhesions, and no post-operative complications occurred.</P><P><B>Conclusion</B></P><P>Robotic single-port transumbilical total hysterectomy is technically feasible in selected patients with gynecological disease. Robotics may enhance surgical skills during single-port transumbilical hysterectomy, especially in patients with gynecologic cancers.</P>
( Nam-jun Cho ),( Dae-yeon Kim ),( Soon Hyo Kwon ),( Tae Won Ha ),( Hyun Kyu Kim ),( Man Ryul Lee ),( Sung Wan Chun ),( Samel Park ),( Eun-young Lee ),( Hyo-wook Gil ) 대한신장학회 2021 Kidney Research and Clinical Practice Vol.40 No.3
Background: Dipeptidyl peptidase-4 (DPP-4) inhibitor has been reported to have kidney-protective benefits. To elucidate how antidia-betic agents prevent diabetic kidney disease progression, it is important to investigate their effect on the kidney environment in type 2 diabetes mellitus (DM) patients. Herein, we investigated the expression pattern of urinary exosome-derived microRNA (miRNA) in patients taking a combination of DPP-4 inhibitor and metformin (DPP-4 inhibitor group) and compared them with patients taking a combination of sulfonylurea and metformin (sulfonylurea group). Methods: This was a prospective study involving 57 patients with type 2 DM (DPP-4 inhibitor group, n = 34; sulfonylurea group, n = 23) and healthy volunteers (n = 7). We measured urinary exosomal miRNA using the NanoString nCounter miRNA array (NanoString Technologies) across the three groups (n = 4 per each group) and validated findings using real-time polymerase chain reaction. Results: Twenty-one differentially expressed candidate miRNAs were identified, and six (let-7c-5p, miR-23a-3p, miR-26a-3p, miR-30d, miR-205, and miR-200a) were selected for validation. Validation showed no significant difference in miRNA expression between the DPP-4 inhibitor and sulfonylurea groups. Only miR-23a-3p was significantly overexpressed in the diabetes group compared with the control group (DPP-4 inhibitor vs. control, p = 0.01; sulfonylurea vs. control, p = 0.007). This trend was consistent even after adjusting for age, sex, and body mass index. Conclusion: There was no significant difference in urine exosome miRNA expression between diabetic participants taking DPP-4 in-hibitor and those taking sulfonylurea. The miR-23a levels were higher in diabetic participants than in nondiabetic controls.
Chemical vapor deposition of graphene on platinum: Growth and substrate interaction
Nam, Jungtae,Kim, Dong-Chul,Yun, Hoyeol,Shin, Dong Hoon,Nam, Seungjin,Lee, Won Ki,Hwang, Jun Yeon,Lee, Sang Wook,Weman, Helge,Kim, Keun Soo Elsevier 2017 Carbon Vol.111 No.-
<P>Low-pressure chemical vapor deposition of graphene has been investigated on various Pt substrates such as e-beam deposited films, sputtered films, and polycrystalline foils. High temperature sputtering is found to be crucial in growing single layer graphene on Pt. It gives highly (111)-oriented crystallization with a significant reduction of dewetting in Pt films, in contrast to e-beam deposited Pt films. Graphene grown on high temperature sputtered Pt films is free of micro-sized multilayer graphene islands normally observed in graphene grown on polycrystalline Pt foils. This indicates that using Pt thin films can effectively suppress the multilayer graphene growth by carbon segregations and precipitations from the Pt bulk. Growth of single layer graphene is demonstrated on Pt films with a thickness down to 25 nm. Effects of the Pt substrates on the as-grown graphene have been investigated. An XY plot of the Raman G and 2D bands in graphene shows a correlation with the surface facet orientations of the Pt substrates measured by electron backscatter diffraction. With a general red shift of the G band distributions, a blue shift of the 2D band distributions is observed, which goes as high as similar to 2750 cm(-1) in graphene grown on Pt (111) films. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Transformation behaviour of Ti–Ni and Ti–Ni–Cu alloy ribbons with nano Ti<sub>2</sub>Ni particles
Nam, Tae-hyun,Lee, Jae-hwa,Jung, Dae-won,Yu, Cheol-am,Liu, Yinong,Kim, Yeon-wook Elsevier 2007 Materials science & engineering. properties, micro Vol.449 No.-
<P><B>Abstract</B></P><P>Ti–Ni and Ti–Ni–Cu alloy ribbons have been prepared by single roll melt spinning, and then martensitic transformation behaviours were investigated by means of transmission electron microscopy, differential scanning calorimetry and X-ray diffraction. In 51Ti–49Ni(at.%) alloy ribbons, Ti<SUB>2</SUB>Ni particles of a size less than 50nm with the coherent interface with the matrix were found, while they were not found in 50Ti–50Ni alloy ribbons. In 49Ti–46Ni–5Cu and 50Ti–45Ni–5Cu alloy ribbons, Ti<SUB>2</SUB>Ni particles of size less than 30nm with coherent interface with the matrix were found. Coherent Ti<SUB>2</SUB>Ni particles induced the R phase transformation in Ti–Ni alloys, and consequently transformation occurred in two-stages, i.e., B2–R–B19. Coherent Ti<SUB>2</SUB>Ni particles induced the B19 martensite in a Ti–45Ni–5Cu alloy, and consequently transformation occurred in two-stages, i.e., B2–B19–B19′. The change in transformation behaviour was ascribed to strain fields developed around coherent Ti<SUB>2</SUB>Ni particles.</P>
Is focused parathyroidectomy appropriate for patients with primary hyperparathyroidism?
Won Woong Kim,Yumie Rhee,Eun Jeong Ban,Cho Rok Lee,Sang-Wook Kang,Jong Ju Jeong,Kee-Hyun Nam,Woong Youn Chung,Cheong Soo Park 대한외과학회 2016 Annals of Surgical Treatment and Research(ASRT) Vol.91 No.3
Purpose: The aim of this study was to determine whether focused or complete parathyroidectomy was more appropriate and to compare follow-up data in primary hyperparathyroidism (PHPT). Methods: We retrospectively analyzed 225 operations for PHPT at Yonsei University Health System between 2000 and 2012. After excluding 93 patients, the remaining 132 were divided into 2 groups: those who underwent focused parathyroidectomy (FP) and those who underwent conventional parathyroidectomy (CP). We compared clinicopathological features; preoperative calcium, parathyroid hormone (PTH), phosphorus, vitamin D, 24-hour urine calcium, and alkaline phosphatase levels; postoperative calcium and PTH levels; pathologic diagnosis; multiplicity; and results of a localization study between the 2 groups. Results: There was no significant difference in the rates of development of postoperative persistent hyperparathyroidism (1/122 FP patients and 1/10 CP patients) between the 2 groups due to a technical reason (FP 0.8% vs. CP 10.0%, P = 0.146). Multiglandular disease (MGD) was uncommon in all cases (6 of 132, 4.5%). All MGD cases were diagnosed using a preoperative localization study. Sestamibi scan and ultrasonography sensitivity were 94.2% and 90.2%, respectively. Conclusion: We suggest that FP is appropriate in PHPT, except in cases of MGD if detected before the operation using preoperative imaging. Knowledge of hereditary PHPT and improved preoperative localization studies, such as high-resolution ultrasonography, contributed to the decision to perform FP rather than CP in all cases of unilateral results of the localizing study.