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Search Results: 1 - 10 of 5574 matches for " Seon-Gyu Choi "
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Mineral Chemistry of REE-Rich Apatite and Sulfur-Rich Monazite from the Mushgai Khudag, Alkaline Volcanic-Plutonic Complex, South Mongolia  [PDF]
Dorjpalma Enkhbayar, Jieun Seo, Seon-Gyu Choi, Young Jae Lee, Enkhbayar Batmunkh
International Journal of Geosciences (IJG) , 2016, DOI: 10.4236/ijg.2016.71003
Abstract: The Mushgai khudag volcanic-plutonic complex consists of four REE mineralization zones: carbonatite zone, apatite zone, magnetite zone, and monazite zone. REE mineralization occurs within peripheries of alkaline magmatic rocks which consist of porphyritic syenite, microsyenite and quartz syenites. Three types of LREE-rich apatite can be found in the carbonatite, apatite, and monazite zones. Crystal-1 type of apatite exists as hexagonal prismatic shape and is mostly found in the apatite zone, and in syenite. Crystal-2 type of apatite can be exposed also at the apatite zone, and carbonatite zone as brecciated massive crystalline aggregate. Crystal-3 type of apatite demonstrates the compositional zoning texture with monazite as inter-zoning, and is only found in monazite zone. The LREE-bearing apatites from the Mushgai khudag complex are mostly fluorapatite to hydroxyl-bearing fluorapatite with variable REE content. Apatites from the monazite zone present individual sulfur-rich monazite grain, and are formed by comprehensive substitutions.
Unique Profile of Ordered Arrangements of Repetitive Elements in the C57BL/6J Mouse Genome Implicating Their Functional Roles
Young-Kwan Lee, Kang-Hoon Lee, Seon-Gyu Kim, Ramzi Melhem, Chang-Suk Moon, Sicong Liu, David G. Greenhalgh, Kiho Cho
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0035156
Abstract: The entirety of all protein coding sequences is reported to represent a small fraction (~2%) of the mouse and human genomes; the vast majority of the rest of the genome is presumed to be repetitive elements (REs). In this study, the C57BL/6J mouse reference genome was subjected to an unbiased RE mining to establish a whole-genome profile of RE occurrence and arrangement. The C57BL/6J mouse genome was fragmented into an initial set of 5,321 units of 0.5 Mb, and surveyed for REs using unbiased self-alignment and dot-matrix protocols. The survey revealed that individual chromosomes had unique profiles of RE arrangement structures, named RE arrays. The RE populations in certain genomic regions were arranged into various forms of complexly organized structures using combinations of direct and/or inverse repeats. Some of these RE arrays spanned stretches of over 2 Mb, which may contribute to the structural configuration of the respective genomic regions. There were substantial differences in RE density among the 21 chromosomes, with chromosome Y being the most densely populated. In addition, the RE array population in the mouse chromosomes X and Y was substantially different from those of the reference human chromosomes. Conversion of the dot-matrix data pertaining to a tandem 13-repeat structure within the Ch7.032 genome unit into a line map of known REs revealed a repeat unit of ~11.3 Kb as a mosaic of six different RE types. The data obtained from this study allowed for a comprehensive RE profiling, including the establishment of a library of RE arrays, of the reference mouse genome. Some of these RE arrays may participate in a spectrum of normal and disease biology that are specific for mice.
The Hot Pepper (Capsicum annuum) MicroRNA Transcriptome Reveals Novel and Conserved Targets: A Foundation for Understanding MicroRNA Functional Roles in Hot Pepper
Dong-Gyu Hwang, June Hyun Park, Jae Yun Lim, Donghyun Kim, Yourim Choi, Soyoung Kim, Gregory Reeves, Seon-In Yeom, Jeong-Soo Lee, Minkyu Park, Seungill Kim, Ik-Young Choi, Doil Choi, Chanseok Shin
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0064238
Abstract: MicroRNAs (miRNAs) are a class of non-coding RNAs approximately 21 nt in length which play important roles in regulating gene expression in plants. Although many miRNA studies have focused on a few model plants, miRNAs and their target genes remain largely unknown in hot pepper (Capsicum annuum), one of the most important crops cultivated worldwide. Here, we employed high-throughput sequencing technology to identify miRNAs in pepper extensively from 10 different libraries, including leaf, stem, root, flower, and six developmental stage fruits. Based on a bioinformatics pipeline, we successfully identified 29 and 35 families of conserved and novel miRNAs, respectively. Northern blot analysis was used to validate further the expression of representative miRNAs and to analyze their tissue-specific or developmental stage-specific expression patterns. Moreover, we computationally predicted miRNA targets, many of which were experimentally confirmed using 5′ rapid amplification of cDNA ends analysis. One of the validated novel targets of miR-396 was a domain rearranged methyltransferase, the major de novo methylation enzyme, involved in RNA-directed DNA methylation in plants. This work provides the first reliable draft of the pepper miRNA transcriptome. It offers an expanded picture of pepper miRNAs in relation to other plants, providing a basis for understanding the functional roles of miRNAs in pepper.
A Case of Maxillary Sinus Cholesteatoma Originating from the Retromaxillary Sinus Wall  [PDF]
Jun Myung Lee, Nam Gyu Ryu, Ick Soo Choi
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2015, DOI: 10.4236/ijohns.2015.45055
Abstract: Cholesteatomas are often observed in the middle ear or mastoid cavity. However, cholesteatomas in areas other than the middle ear or mastoid are extremely rare and thus are not often reported in the literature. We recently treated an 18-year-old female patient with an incidentally detected maxillary sinus mass. A paranasal sinus computed tomography examination revealed a cystic lesion in the left maxillary sinus infiltrating the posterolateral walls of the left maxillary sinus. An endoscopic operation was performed for definitive diagnosis. Histopathological examination of the mass confirmed the diagnosis of cholesteatoma. Despite the rarity of paranasal cholesteatoma in comparison with cholesteatomas in the tympanum, a few cases involving the frontal sinus have been reported. However, retromaxillary cholesteatoma is even less common than sinus cholesteatoma and is reported rarely. To our knowledge, this is the first reported case of a maxillary cholesteatoma originating from the retromaxillary area. For this reason, we present this case along with a literature review.
Structural Design Optimization of a Vertical Axis Wind Turbine for Seismic Qualification and Lightweight  [PDF]
Young-Hyu Choi, Min-Gyu Kang
World Journal of Engineering and Technology (WJET) , 2016, DOI: 10.4236/wjet.2016.43D019
Recently, there is a growing interest in seismic qualification of ridges, buildings and mechanical equipment worldwide due to increase of accidents caused by earthquake. Severe earthquake can bring serious problems in the wind turbines and eventually lead to an interruption to their electric power supply. To overcome and prevent these undesirable problems, structural design optimization of a small vertical axis wind turbine has performed, in this study, for seismic qualification and lightweight by using a Genetic Algorithm (GA) subject to some design constraints such as the maximum stress limit, maximum deformation limit, and seismic acceleration gain limit. Also, the structural design optimizations were conducted for the four different initial design variable sets to confirm robustness of the optimization algorithm used. As a result, all the optimization results for the 4 different initial designs showed good agreement with each other properly. Thus the structural design optimization of a small vertical-axis wind turbine could be successfully accomplished.
Steady-state probability density function in wave turbulence under large volume limit

Yeontaek Choi,Sang Gyu Jo,

中国物理 B , 2011,
Abstract: We investigate the possibility for two-mode probability density function (PDF) to have a non-zero flux steady state solution. We take the large volume limit so that the space of modes becomes continuous. It is shown that in this limit all the steady-state two- or higher-mode PDFs are the product of one-mode PDFs. The flux of this steady-state solution turns out to be zero for any finite mode PDF.
Building RDF-Schema Based Knowledge Map for Knowledge Management Systems
Doug W. Choi,Hyun Gyu Lee
Journal of Systemics, Cybernetics and Informatics , 2003,
Abstract: This paper attempts to implement the semantic web paradigm, which enables the semantic search of knowledge and information on the web environment, by adopting RDF, RDF-schema and Dublin core data element structure in the process of building knowledge map. Since the RDF, RDF-schema, and Dublin core data element structure comply with the XML grammar, we have greater convenience and flexibility in representing knowledge into XML document format. Representing knowledge following the RDF-schema and the Dublin core structure enables the well-formed and semantic description of knowledge, facilitating the representation of knowledge into the frame format.
Retiform Sertoli-Leydig Cell Tumor of the Ovary  [PDF]
Gyu-Bong Yu, Seung-Kyu Choi, Yun-Dan Kang, Choong-Hak Park
International Journal of Clinical Medicine (IJCM) , 2016, DOI: 10.4236/ijcm.2016.79065
Abstract: Sertoli-Leydig cell tumor of the ovary is a kind of sex cord-stromal tumor, which occurs between teens and twenties with symptoms including abdominal pain and swelling. The incidence rate is infinitely rare comprising less than 0.5% of all ovarian tumor. The average age of “retiform Sertoli-Leydig cell tumor” is 17 years as compared to 25 years for Sertoli-Leydig cell tumors as a group. We have experienced this rare case of retiform Sertoli-Leydig cell tumor in a 25-year-old foreign patient with the complaint of palpable mass on the right lower quadrant and an irregular menstrual period. The patient underwent right salpingo-oophorectomy and tumor stage was FIGO stage 1A. We report with a brief review of literature.
Projective deformations of weakly orderable hyperbolic Coxeter orbifolds
Suhyoung Choi,Gye-Seon Lee
Mathematics , 2012, DOI: 10.2140/gt.2015.19.1777
Abstract: A Coxeter $n$-orbifold is an $n$-dimensional orbifold based on a polytope with silvered boundary facets. Each pair of adjacent facets meet on a ridge of some order $m$, whose neighborhood is locally modeled on ${\mathbb R}^n$ modulo the dihedral group of order $2m$ generated by two reflections. For $n \geq 3$, we study the deformation space of real projective structures on a compact Coxeter $n$-orbifold $Q$ admitting a hyperbolic structure. Let $e_+(Q)$ be the number of ridges of order $\geq 3$. A neighborhood of the hyperbolic structure in the deformation space is a cell of dimension $e_+(Q) - n$ if $n=3$ and $Q$ is weakly orderable, i.e., the faces of $Q$ can be ordered so that each face contains at most $3$ edges of order $2$ in faces of higher indices, or $Q$ is based on a truncation polytope.
Effective Use of Sugammadex for Incomplete Pyridostigmine Reversal of Muscle Relaxation by Rocuronium: A Case Report  [PDF]
Hee Jong Lee, Kyo Sang Kim, Ji Seon Jeong, Sung Hwan Choi, Kyu Nam Kim
Open Journal of Anesthesiology (OJAnes) , 2013, DOI: 10.4236/ojanes.2013.39083

Anticholinesterase does not allow adequate reversal of the deep neuromuscular blockade (NMB) achieved using high doses of relaxants. A 71-year-old female patient (weight 70 kg, height 169 cm) was scheduled for a transurethral resection of a bladder tumor under general anesthesia. We administered rocuronium 30 mg (0.43 mg/kg) for tracheal intubation due to an estimated short surgical time. During the operation, an additional rocuronium 10 mg was injected. The surgical procedure ended abruptly 10 minutes after receiving the last dose of rocuronium. At the end of surgery, the patient received pyridostigmine as a reversal. However, residual NMB persisted, and neuromuscular monitoring did not show the expected degree of recovery. Sugammadex 2 mg/kg was used, and the patient experienced complete reversal from NMB in just 2 min.

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