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( Jae Young Chun ),( Sung Wook Hwang ),( Jee Hyun Kim ),( Jong Pil Im ),( Jae Hee Cheon ),( Byong Duk Ye ),( Ji Won Kim ),( You Sun Kim ),( Joo Sung Kim ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Background: The disease course and poor prognostic factors in Korean patients with Crohn`s disease (CD) has not been fully determined. The aim of this studyis to assess the clinical characteristics and long-term outcomes of CD patients according to the presence of perianal fi stula. Methods: This retrospective cohort study enrolled patients diagnosed with CD between July 1982 and December 2008 from 29 hospitals in Korea. Those who had a follow-up shorter than 12 months were excluded. The primary endpoints were CD-related complications including non-perianal fi stula, stricture, and intra- abdominal abscess. Results: A total of 1,193 CD patients were enrolled. Mean follow-up period was 8.46 years (range, 1.0-26.4). Four hundred sixty-five (39.0%) CD patientsexperienced perianal fi stula. fistulizing perianal CD was signifi cantly associated with younger age (<40 years old), male gender, diagnosis of CD at primary or secondary care clinics, and ileocolonic involvement. Complications of non-perianal fi stula (p=0.025) and intra-abdominal abscess (p=0.003) were signifi cantly more common in patients with fistulizing perianal CD than in those without fi stulizing perianal CD. In contrast, complicated stricture was not associated with perianal fi stula. Independent risk factors for non-perianal fi stula were perianal fi stula (adjusted hazard ratio [HR], 1.47; 95% confi dence interval [CI], 1.09-1.99; p=0.011), female (adjusted HR, 1.46; 95% CI, 1.08-1.98; p=0.014), diagnosis of CD at referral hospital (adjusted HR, 1.72; 95% CI, 1.13-2.62; p=0.011), and upper gastrointestinal involvement (adjusted HR, 1.87; 95% CI, 1.37-2.55; p<0.001). Furthermore, perianal fistula (adjusted HR, 1.37; 95% CI, 1.01-1.88; p=0.046) and upper gastrointestinal involvement (adjusted HR, 1.48; 95% CI, 1.05-2.07; p=0.025) signifi cantly increased the risk of intra-abdominal abscess. Conclusions: Perianal fi stula predicts development of non-perianal fi stula and intra- abdominal abscess in CD patients. Therefore, patients with fi stulizing perianal CD should be carefully monitored for the complicated fi stula.
Estimation of Carrier Frequency Offset for IEEE 802.16 OFDM System
Won-Jae Shin,Eu-Suk Shim,Byoung-Heon Lee,Jae-Hoon Yi,Young-Hwan You 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, algorithms for synchronization of carrier frequency offset (CFO) are presented which use the preamble in OFDM-based 802.16 systems. To demonstrate the efficiency of the proposed scheme, the performance of the proposed CFO estimators is compared to that of conventional method in terms of mean square error (MSE) and acquisition range.
You, Jong-Bum,Lee, Wook-Jae,Won, Dongshik,Yu, Kyoungsik Optical Society of America 2014 Optics express Vol.22 No.7
<P>The cavity resonant properties of planar metal-dielectric layered structures with optically dense dielectric media are studied with the aim of realizing omnidirectional and polarization-insensitive operation. The angle-dependent coupling between free-space and cavity modes are revealed to be a key leverage factor in realizing nearly perfect absorbers well-matched to a wide range of incidence angles. We establish comprehensive analyses of the relationship between the structural and optical properties by means of theoretical modeling with numerical simulation results. The presented work is expected to provide a simple and cost-effective solution for light absorption and detection applications that exploit planar metal-dielectric optical devices.</P>
Won-Ho Ha,Jae-Hyun Ahn,A-Ram You,Ji-Hye Kim,Min-Jeong Cho,Seung-Chul Shin 대한예방치과학회 2013 International Journal of Clinical Preventive Denti Vol.9 No.4
Objective: The purpose of this study was to investigate the stain removal, calculus deposit inhibition, and cleaning effect for teeth surface and interdental region by using toothpaste containing Pyrophosphate and soft granule (Zeolite-M). Methods: 1) For the study, general toothpaste was prepared as control and 2 kinds of test toothpastes were prepared. Test toothpaste-1(T1) containing Pyrophosphate and test toothpaste-2 (T2) containing Pyrophosphate and soft granule (Zeolite-M, Ultra White BallⓇ). 2) In-vitro study: The stain removal and interdental cleaning effect were measured using stained Hydroxyapatite tablet, and 20 subjects’ teeth surface and interdental cleaning effect by brushing was evaluated with test toothpaste. 3) Clinical study: The study was performed on 88 subjects. Calculus index and Stain index were measured during 8 week. Results: 1) T2 showed the highest stain removal and cleaning effect for teeth surface and interdental region. The results of the experiment were statistically significant (p<0.05). 2) After using toothpastes 4 weeks, subjects using T2 showed less tartar deposit than using control, and after 8 weeks, T2 statistically inhibit tartar formation than T1 and control (p<0.05). 3) Using T2 longer than 4 weeks could be accepted as a highly effective way to stain removal. Conclusion: T2 showed significantly effective on plaque, stain removal, calculus deposit inhibition and cleaning for teeth surface and interdental region than control toothpastes. Therefore, toothpaste containing pyrophosphate and soft granule is recommendable to prevent calculus formation and teeth staining. The subjects using T 2 can feel whitening efficacy and satisfaction of cleaning more than placebo and T1.
Fetal Loss Rate after Mid-trimester Amniocentesis
You Jung Han,Yun Young Kim,Si Won Lee,Min Hyoung Kim,Jin Hoon Chung,Hyun Kyong Ahn,Jung Yeol Han,Moon Young Kim,Jae Hyug Yang,Kyu Hong Choi,So Yeon Park,Hyun Mee Ryu 대한의학유전학회 2012 대한의학유전학회지 Vol.9 No.1
Purpose: The aim of this study was to asses the fetal loss rate after mid-trimester amniocentesis. Materials and Methods: This was a retrospective cohort study including singleton pregnant women who underwent midtrimester amniocen tesis at Cheil General Hospital from January 2008 through December 2010. The procedure-related fetal loss was defined as miscarriage within 2 weeks after amniocentesis. We evaluated the fetal loss rate within 2 weeks after amniocentesis and fetal loss rate before 24 gestational weeks. Results: During the study period, a total of 4,356 singleton pregnant women underwent mid-trimester amniocentesis. A total of Five hundred ninety six women were excluded owing to follow up loss and termination of pregnancy due to abnormal karyotype or major anomaly. At our institute, the fetal loss rate within 2 weeks was 0.1% and before 24 gestational weeks was 0.3% after amniocentesis. Conclusion: The fetal loss rate after mid-trimester amniocentesis in our study is lower than previously reported rate. We suggest that amniocentesis is a safe procedure.