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Search Results: 1 - 10 of 39472 matches for " Dae Won Jun "
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Non-degenerate quadric surfaces in Euclidean 3-space
Dae Won Yoon,Ji Soon Jun
International Journal of Mathematical Analysis , 2012,
Abstract:
Genetic and Epigenetic Alterations of the NF2 Gene in Sporadic Vestibular Schwannomas
Jong Dae Lee, Tae Jun Kwon, Un-Kyung Kim, Won-Sang Lee
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0030418
Abstract: Background Mutations in the neurofibromatosis type 2 (NF2) tumor-suppressor gene have been identified in not only NF2-related tumors but also sporadic vestibular schwannomas (VS). This study investigated the genetic and epigenetic alterations in tumors and blood from 30 Korean patients with sporadic VS and correlated these alterations with tumor behavior. Methodology/Principal Findings NF2 gene mutations were detected using PCR and direct DNA sequencing and three highly polymorphic microsatellite DNA markers were used to assess the loss of heterozygosity (LOH) from chromosome 22. Aberrant hypermethylation of the CpG island of the NF2 gene was also analyzed. The tumor size, the clinical growth index, and the proliferative activity assessed using the Ki-67 labeling index were evaluated. We found 18 mutations in 16 cases of 30 schwannomas (53%). The mutations included eight frameshift mutations, seven nonsense mutations, one in-frame deletion, one splicing donor site, and one missense mutation. Nine patients (30%) showed allelic loss. No patient had aberrant hypermethylation of the NF2 gene and correlation between NF2 genetic alterations and tumor behavior was not observed in this study. Conclusions/Significance The molecular genetic changes in sporadic VS identified here included mutations and allelic loss, but no aberrant hypermethylation of the NF2 gene was detected. In addition, no clear genotype/phenotype correlation was identified. Therefore, it is likely that other factors contribute to tumor formation and growth.
Self-Assembled Wire Arrays and ITO Contacts for Silicon Nanowire Solar Cell Applications

YANG Cheng,ZHANG Gang,LEE Dae-Young,LI Hua-Min,LIM Young-Dae,YOO Won Jong,PARK Young-Jun,KIM Jong-Min,

中国物理快报 , 2011,
Abstract:
Asymptomatic lymphangioma involving the spleen and retroperitoneum in adults
Sook Hee Chung, Young Sook Park, Yun Ju Jo, Seong Hwan Kim, Dae Won Jun, Byoung Kwan Son, Jun Young Jung, Dae Hyun Baek, Dong Hee Kim, Yoon Young Jung, Won Mi Lee
World Journal of Gastroenterology , 2009,
Abstract: Lymphangioma, a benign neoplasm of the lymphatic system, is common in children but rare in adults. Its clinical manifestations include abdominal pain, nausea, vomiting and a palpable mass. However, abdominal sonography or abdominal computed tomography (CT) scan can also incidentally reveal lymphangioma. A larger or symptomatic lymphangioma is treated with total resection to prevent recurrence, infection, torsion and enlargement. Although lymphangioma rarely becomes malignant, its prognosis is generally good. We report a cystic lymphangioma of the spleen and retroperitoneum, which was incidentally found in a 56-year-old man who was hospitalized due to a colon mass. Physical examination showed no specific findings. Abdominal CT revealed a 5.7 cm, non-enhanced multilobulated cystic mass with multiple septa in the spleen and a 10 cm lobulated cystic mass in the paraaortic area. Splenectomy and retroperitoneal resection of the cystic mass were conducted. The endothelium of splenic and retroperitoneal cyst was immunohistochemically stained with D2-40 antibody. The patient was finally diagnosed with splenic cystic and retroperitoneal cavernous lymphangioma.
Inequality for Ricci curvature of certain submanifolds in locally conformal almost cosymplectic manifolds
Dae Won Yoon
International Journal of Mathematics and Mathematical Sciences , 2005, DOI: 10.1155/ijmms.2005.1621
Abstract: We establish inequalities between the Ricci curvature and the squared mean curvature, and also between the k-Ricci curvature and the scalar curvature for a slant, semi-slant, and bi-slant submanifold in a locally conformal almost cosymplectic manifold with arbitrary codimension.
Some classification of translation surfaces in Galilean 3-space
Dae Won Yoon
International Journal of Mathematical Analysis , 2012,
Abstract:
On the second Gaussian curvature of ruled surfaces in Euclidean $3$-space
Dae Won Yoon
Tamkang Journal of Mathematics , 2006, DOI: 10.5556/j.tkjm.37.2006.221-226
Abstract: In this paper, we mainly investigate non developable ruled surface in a 3-dimensional Euclidean space satisfying the equation $K_{II} = KH$ along each ruling, where $K$ is the Gaussian curvature, $H$ is the mean curvature and $K_{II}$ is the second Gaussian curvature.
General Helices of AW(k)-Type in the Lie Group
Dae Won Yoon
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/535123
Abstract: We study curves of AW(k)-type in the Lie group G with a bi-invariant metric. Also, we characterize general helices in terms of AW(k)-type curve in the Lie group G. 1. Introduction The geometry of curves and surfaces in a 3-dimensional Euclidean space represented for many years a popular topic in the field of classical differential geometry. One of the important problems of the curve theory is that of Bertrand-Lancret-de Saint Venant saying that a curve in is of constant slop; namely, its tangent makes a constant angle with a fixed direction if and only if the ratio of torsion and curvature is a constant. These curves are said to be general helices. If both and are nonzero constants, the curve is called cylindrical helix. Helix is one of the most fascinating curves in science and nature. Scientists have long held a fascinating, sometimes bordering on mystical obsession for helical structures in nature. Helices arise in nanosprings, carbon nanotubes, -helices, DNA double and collagen triple helix, the double helix shape is commonly associated with DNA, since the double helix is structure of DNA. The problem of Bertrand-Lancret-de Saint Venant was generalized for curves in other 3-dimensional manifolds—in particular space forms or Sasakian manifolds. Such a curve has the property that its tangent makes a constant angle with a parallel vector field on the manifold or with a Killing vector field, respectively. For example, a curve in a 3-dimensional space form is called a general helix if there exists a Killing vector field with constant length along and such that the angle between and is a non-zero constant (see [1]). A general helix defined by a parallel vector field was studied in [2]. Moreover, in [3] it is shown that general helices in a 3-dimensional space form are extremal curvatures of a functional involving a linear combination of the curvature, the torsion, and a constant. General helices also called the Lancret curves are used in many applications (e.g., [4–7]). The notion of AW(k)-type submanifolds was introduced by Arslan and West in [8]. In particular, many works related to curves of AW(k)-type have been done by several authors. For example, in [9, 10] the authors gave curvature conditions and charaterizations related to these curves in . Also, in [11] they investigated curves of AW(k) type in a 3-dimensional null cone and gave curvature conditions of these kinds of curves. However, to the author’s knowledge, there is no article dedicated to studying the notion of AW(k)-type curves immersed in Lie group. In this paper, we investigate curvature
Applied and Translational Genomics for Human Genetics and Clinical Science
Dae-Won Kim
Frontiers in Bioengineering and Biotechnology , 2014, DOI: 10.3389/fbioe.2014.00011
Abstract: A book review based on Applied Computational Genomics (Translational Bioinformatics Volume 1) Edited by Yin Yao Shugart Springer; 2012; ISBN: 978-94-007-5557-4; Hardcover; 184 pp.; $189.00. Translational bioinformatics is an emerging field of study that addresses the computational challenges encountered in biological and clinical research as well as in the analysis and interpretation of the data generated from it. Applied computation genomics, as part of the Springer Series on Translational Bioinformatics, thoroughly discusses the most relevant issues in the development of novel techniques for the integration of human genetic, biological, and clinical data. This book also provides an example of theories and research being practically applied to inform translational medical research in clinical diagnosis. This book covers numerous experimental and computational methods related to statistical development and their applications in the field of human genomics, including candidate gene mapping, linkage analysis, population-based, genome-wide association, exon sequencing, and whole genome sequencing analysis. This book consists of ten chapters. The first chapter focuses on an overview of the current human genome science. It reviews the history of using machine-learning algorithms for studies on disease prediction and provides highlights for the other nine chapters, which have been collected in this book. Chapter 2 provides a broad overview of the most important concepts in genetic epidemiology. In this chapter, the authors provide a precise definition for complex traits and a thorough introduction to genetic epidemiology as a tool for understanding the role of genetic factors. In addition, the essential study designs used to accomplish this goal, including family, twin, adoption, and migration studies, are summarized. Chapter 3 focuses on integrated linkage analysis and its results in the design, execution, and interpretation of whole genome or whole exome sequencing studies. It includes experiments, knowledge, and specific example data. This chapter also presents new statistical algorithms to identify rare variants in pedigree settings for both qualitative and quantitative traits. Chapter 4 briefly reviews the methods used to combine functional genomic data to detect complex diseases. Chapter 4 examines the progress of research on a specific rare disorder, nasopharyngeal carcinoma (NPC). Dr. Jorgensen et al. conducted a thorough review of all candidate genes related to NPC and explained the findings of two genome-wide association studies (GWAS), one by a
Colonoscopy evaluation after short-term anti-tuberculosis treatment in nonspecific ulcers on the ileocecal areaColonoscopy evaluation after short-term anti-tuberculosis treatment in nonspecific ulcers on the ileocecal area
Young Sook Park, Dae Won Jun, Seong Hwan Kim, Han Hyo Lee, Yun Ju Jo, Moon Hee Song, Nam In Kim, Jun Seok Lee
World Journal of Gastroenterology , 2008,
Abstract: AIM: To evaluate the efficacy of colonoscopy follow-up after short-term anti-tuberculosis treatment in patients with nonspecific ulcers on ileocecal areas being suspicious of tuberculous colitis.METHODS: We prospectively analyzed the colonoscopic findings before and after short term anti-tuberculosis treatment in 18 patients with nonspecific ulcers on the ileocecal area and compared them with 7 patients of confirmed tuberculous colitis by acid-fast bacilli or caseating granuloma on colonic biopsy.RESULTS: Mean duration for short-term follow-up was 107.3 d with combined chemotherapy containing isoniazid, rifampicin, ethambutol and pyrazinamide. Seven patients with tuberculous colitis showed complete healing of active ulcers after short-term medication. After short-term anti-tuberculosis treatment, follow-up colonoscopy findings divided 18 patients with nonspecific ulcers into two groups by ulcer state. One is the “suspicious tuberculous colitis group” showing healing of ulcers and erosions and another is the “suspicious inflammatory bowel disease group” showing active ulcers with or without aggravation of the lesion. Finally, all 9 of the “suspicious tuberculous colitis group” were diagnosed as tuberculous colitis showing no recurrence of ulcers after termination of 9 mo of anti-tuberculosis medication. Patients of the “suspicious inflammatory bowel disease group” were finally diagnosed as Crohn’s disease or nonspecific colonic ulcers during long-term follow up.CONCLUSION: Follow-up colonoscopy shows a healing stage ulcer or scarring change without an active ulcer with just 2 mo to 3 mo of medication in patients with tuberculous colitis. Colonoscopy follow-up after short term anti-tuberculosis trial in patients with nonspecific ulcers on the ileocecal area is valuable in making early differential diagnosis of tuberculous colitis.
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