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( Jae Young Jang ),( Soung Won Jeong ),( Sung Ran Cheon1 ),( Sae Hwan Lee1 ),( Sang Gyune Kim ),( Young Koog Cheon ),( Young Seok Kim1 ),( Young Deok Cho1 ),( Hong Soo Kim ),( So Young Jin ),( Yun Soo 대한간학회 2011 Clinical and Molecular Hepatology(대한간학회지) Vol.17 No.3
Background/Aims: We investigated the frequency of occult hepatitis B virus (HBV) infection in anti-hepatitis C virus (HCV)-positive individuals and the effects of occult HBV infection on the severity of liver disease. Methods: Seventy-one hepatitis B virus surface-antigen (HBsAg)-negative patients were divided according to their HBV serological status into groups A (anti-HBc positive, anti-HBs negative; n=18), B (anti-HBc positive, anti-HBs positive; n=34), and C (anti-HBc negative, anti-HBs positive/negative; n=19), and by anti-HCV positivity (anti-HCV positive; n=32 vs. anti-HCV negative; n=39). Liver biopsy samples were taken, and HBV DNA was quantified by real-time PCR. Results: Intrahepatic HBV DNA was detected in 32.4% (23/71) of the entire cohort, and HBV DNA levels were invariably low in the different groups. Occult HBV infection was detected more frequently in the anti-HBc-positive patients. Intrahepatic HBV DNA was detected in 28.1% (9/32) of the anti-HCV-positive and 35.9% (14/39) of the anti-HCV-negative subjects. The HCV genotype did not affect the detection rate of intrahepatic HBV DNA. In anti-HCV-positive cases, occult HBV infection did not affect liver disease severity. Conclusions: Low levels of intrahepatic HBV DNA were detected frequently in both HBsAg-negative and anti-HCV-positive cases. However, the frequency of occult HBV infection was not affected by the presence of hepatitis C, and occult HBV infection did not have a significant effect on the disease severity of hepatitis C. (Korean J Hepatol 2011;17:206-212)
( Sang Gyune Kim ),( Jeong Joo Yoo ),( Young Seok Kim ),( Bora Lee ),( Soung Won Jeong ),( Jae Young Jang ),( Sae Hwan Lee ),( Hong Soo Kim ),( Young Don Kim ),( Gab Jin Cheon ),( Boo Sung Kim ) 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: The accuracy of detailed fibrosis stage classification assessed with transient elastography (fibroscan) was only 65% and, what is more, significant discrepancy rate (≥ 2 fibrosis stage) reached up to 13%. Several causative factors such as age, elevated liver enzyme, body mass index (BMI), skin to liver distance (SLD) are considered to contribute to this discrepancy, but there are few authentic evidences of what really works. In this study, we compared the discordance of fibrosis stage classification between fibroscan and two-dimensional shear wave ultrasound (2D-SWE) and looked for which variables are related with it. Methods: Patients who had a valid measurement and an adequate liver biopsy specimen were 291. The fibrosis stage classifications derived from the cumulated cut-offs calculated for different fibrosis stage by fibroscan as well as 2D-SWE. The discrepancy score took into account the size of error between fibrosis stage (Metavir) and fibrosis stage classification (fibroscan, 2D-SWE). This score was defined as follows: 0 for correct classification, then 1, 2, or 3 as per the misclassification in fibrosis stages. Results: Patients were male predominant (54.0%), their mean age was 48.9±13.5 years old. Liver fibrosis stage consisted of F0 (13.4%), F1 (22.0%), F2 (24.1%), F3 (16.8%) and F4 (23.7%). The optimal cut-off for each fibrosis stage observed by fibroscan was 6.9 (≥F2), 7.9 (≥F3), 10.4 (F4) and 6.7 (≥F2), 7.1 (≥F3), 10.0 (F4) by 2D-SWE. Accurate assessment of fibrosis stage classification by discrepancy score showed that the proportion of underestimation and overestimation was 19.6%, 22.0% in fibroscan, and 21.0%, 17.9% in 2D-SWE. The descrepancy score of fibroscan was higher than that of 2D-SWE (p=0.032). In multivariate analysis, viral liver disease, shorter SLD, lower prothrombin time were associated with underestimation in both fibroscan and 2D-SWE. Longer SLD and higher AST level significantly increased overestimation in fibroscan and, in 2D-SWE along with age. When a skin to liver distance is over 2.5cm, 80.0% (12/15) of fibroscan and 46.7% (7/15) of 2D-SWE were overestimated. Conclusions: Liver fibrosis stage in fairly large number of patients is misclassified by either fibroscan or 2D-SWE. Skin to liver distance rather than BMI was most important factor to affect the over and underestimation of liver fibrosis classification.
ESTABLISHING BUSINESS STRATEGIES FOR TOURISM LOCATION BASED SERVICES (TLBS)
Sung Hwan. Cheon 한국관광학회 2007 International Journal of Tourism Sciences Vol.7 No.1
The main purpose of the paper is to find the proper way of supplying tourism information to customers in the fast changing world of wireless internet technology and external environments and to establish the proper strategy of supplying LBS information, what the users really want, by analyzing the users" and market"s present condition. Therefore, the conclusion of the paper can be summarized as follows: First, we need to construct a personal tourism information system based on LBS. This means that by using wireless internet service, we can make the service more elaborate and also construct the system with "mobility", "individuality" and "timeliness". Therefore, we can supply the accurate information what consumers want in shorter period and also create more profit by supplying the information that can satisfy the customers. Second, to increase the percentage of satisfaction, we need more investment in technology development. Third, we need to develop a new interface for new users. In the case of male users, the highest using place is during transportation (Subway/Bus/Vehicle). On the contrary, in the case of female users, they mostly use the service at home. Fourth, we need to establish a new pricing model.
New <i>q</i>-Laguerre polynomials having factorized permutation interpretations
Cheon, Gi-Sang,Jung, Ji-Hwan,Kim, Suh-Ryung Elsevier 2019 Journal of mathematical analysis and applications Vol.470 No.1
<P><B>Abstract</B></P> <P>In this paper, we generalize the Laguerre polynomials in terms of <I>q</I>-analogue for Riordan matrices. To be more specific, for α ∈ <SUB> N 0 </SUB> , we introduce new <I>q</I>-Laguerre polynomials L n ( α ) ( x ; q ) by defining the Eulerian generating function for L n ( α ) ( x ; q ) as [FORMULA OMISSION] Interestingly, it turns out that L n ( α ) ( x ; q ) have combinatorial descriptions in the aspect of the inversions of factorized permutations and <I>q</I>-rook numbers. We locate their zeros and develop their algebraic properties as well.</P>
14q32.33 Deletion Identified by array-CGH in a 5-year old-girl with Seizure
Cheon, Chong-Kun,Park, Sang-Jin,Choi, Ook-Hwan Korean Society of Medical Genetics and Genomics 2011 대한의학유전학회지 Vol.8 No.1
14q32.33을 포함한 14번 염색체 장완 결실은 드문 질환이다. 14번 염색체의 말단 결실은 여러 임상증상을 공통적으로 보일 수 있으나 결실 절단부 (breakpoint)에 따라 표현형이 다양하게 발생할 수 있다. 저자들은 경련을 동반한 5세 여아에서 array comparative genomic hybridization (array-CGH)와 fluorescence in situ hybridization (FISH) 방법을 이용하여 이전 보고에 비해 가장 작은 14q32.33부위의 0.33 Mb 크기의 말단 결실과 심하지 않은 표현형을 보이는 1례를 경험 하였기에 문헌고찰과 함께 보고하는 바이다. Deletions of 14q including band 14q32.33 are uncommon. Patients with terminal deletions of chromosome 14 usually share a number of clinical features. By molecular techniques (array comparative genomic hybridization (CGH) and fluorescence in situ hybridization (FISH), we identified a young girl with 0.3 Mb terminal 14q32.33 deletion. Review of the nine cases with pure terminal 14q32.3 deletions described to date documented that our observation is the smallest terminal 14q deletion ever reported. The phenotype of our patient is much less severe than the phenotypes of the patients reported previously. We report our experience in examining the clinical, behavioral, and cognitive findings in a 5-year-old girl studied with chromosomal microarray hybridization and reviewed previously reported patients with 14q32 deletions.
( Sung Eun Kim ),( Moo In Park ),( Seun Ja Park ),( Won Moon ),( Youn Jung Choi ),( Ji Hyun Cheon ),( Hye Jung Kwon ),( Ki Hwan Ku ),( Chang Hun Yoo ),( Jae Hyun Kim ),( Gyu Won Lee ),( Sung Eun Song 대한내과학회 2015 The Korean Journal of Internal Medicine Vol.30 No.6
Background/Aims: Trends in successful eradication of Helicobacter pylori using first-line triple therapy, consisting of a proton pump inhibitor, amoxicillin, and clarithromycin, have been understudied. We evaluated H. pylori eradication rates at a single center over the last 10 years and identified risk factors related to eradication failure. Methods: This study included 1,413 patients who were diagnosed with H. pylori infection and received 7 days of triple therapy between January 2003 and December 2012. We investigated H. pylori eradication rates retrospectively with respect to the year of therapy, as well as demographic and clinical factors. H. pylori eradication was confirmed by a 13C-urea breath test or a rapid urease test at least 4 weeks after the completion of triple therapy. Results: The overall H. pylori eradication rate was 84.9%. Annual eradication rates from 2003 to 2012 were 93.5%, 80.0%, 87.2%, 88.5%, 92.0%, 88.3%, 85.7%, 84.1%, 83.7%, and 78.8%, respectively, by per-protocol analysis. The eradication rate with first-line triple therapy decreased during the last 10 years (p = 0.015). Multivariate analysis showed that female gender (odds ratio [OR], 1.69; 95% confidence interval [CI], 1.12 to 2.55) and smoking (OR, 1.61; 95% CI, 1.05 to 2.47) were associated with the failure of H. pylori eradication therapy. Conclusions: The efficacy of first-line triple therapy for H. pylori infection has decreased over the last 10 years, suggesting an increase in antibiotic-resistant H. pylori strains. Thus, other first-line therapies may be necessary for H. pylori eradication in the near future.
Cheon, Jae Hee,Kim, Eun Soo,Shin, Sung Jae,Kim, Tae Il,Lee, Kang Moon,Kim, Sang Woo,Kim, Joo Sung,Kim, You Sun,Choi, Chang Hwan,Ye, Byong Duk,Yang, Suk-Kyun,Choi, Eun Hee,Kim, Won Ho American College of Gastroenterology 2009 The American journal of gastroenterology Vol.104 No.10
<P>OBJECTIVES: It is difficult to diagnose intestinal Behçet's disease (BD) due to various extraintestinal manifestations emerging at different time points in the disease course and a lack of reliable diagnostic criteria. We conducted this study to develop and validate novel diagnostic criteria for intestinal BD. METHODS: Experts from three universities generated the preliminary diagnostic criteria for intestinal BD, and a consensus was reached using a modified Delphi method with 13 gastroenterologists participating. To validate the criteria, we recruited 12,850 consecutive patients who underwent colonoscopic examinations between January 2000 and December 2006 at Severance Hospital, Yonsei University, Seoul, Korea. RESULTS: The novel diagnostic criteria were developed on the basis of two aspects: colonoscopic findings and extraintestinal manifestations. Of the 12,850 patients, 280 with ileocolonic ulcers were enrolled for validation. At the time of initial colonoscopic examinations, patients were categorized for BD status into 4 groups: definite (84 patients), probable (67), suspected (15), and nondiagnostic (114). At the end of the follow-up period (mean, 50.9+/-25.7 months), intestinal BD was confirmed in 145 patients (51.8%)-84 (100%) from the definite group, 49 (73.1%) from the probable group, 10 (66.7%) from the suspected group, and 2 (1.8%) from the nondiagnostic group. The overall sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of the diagnosis probability of these criteria were 98.6, 83.0, 86.1, 98.2, and 91.1%, respectively. CONCLUSIONS: These newly proposed, simple criteria might be useful in diagnosing intestinal BD, especially in patients with ileocolonic ulcers who do not fully satisfy the diagnostic criteria of systemic BD.</P>
High-precision quality assurance of robotic couches with six degrees of freedom
Cheon, Wonjoong,Cho, Junsang,Ahn, Sung Hwan,Han, Youngyih,Choi, Doo Ho NUCLITAL S.R.L. GRUPPO NUCLETRON HOLDING-OLANDA 2018 PHYSICA MEDICA Vol.49 No.-
<P>The mean error and standard deviation of linear and rotational motions, as well as couch sagging were analyzed from continuously acquired images in the moving couch. The accuracy of VTS was 0.024 mm deviation for the sinusoidal motion, and the accuracy of the transformation matrix was 0.02 mm. In a cross-comparison, the difference between Laser Tracker (FARO) measurements was 0.14 +/- 0.12 mm for translation and 0.032 +/- 0.026 degrees on average for yaw rotation. The new system provides QA of yaw, pitch and roll motion as well as sagging of the couch and sub-millimeter/degree accuracy together with precision.</P>