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Search Results: 1 - 10 of 9627 matches for " Si-Gyun Roh1 "
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Angioleiomyoma of the Auricle
Hyo-In Kim1,Si-Gyun Roh1,Nae-Ho Lee1,Kyung-Moo Yang1
Archives of Plastic Surgery , 2013, DOI: http://dx.doi.org/10.5999/aps.2013.40.1.68
Abstract:
Radiofrequency Ablation and Excision of Multiple Cutaneous Lesions in Neurofibromatosis Type 1
Seong-Hun Kim,Si-Gyun Roh,Nae-Ho Lee,Kyung-Moo Yang
Archives of Plastic Surgery , 2013, DOI: http://dx.doi.org/10.5999/aps.2013.40.1.57
Abstract: Background Von Recklinghausen disease or neurofibromatosis type 1 is an autosomaldominant genetic disorder of chromosome 17q11.2. The most common characteristic findingsof NF 1 include multiple and recurrent cutaneous neurofibromas associated with psychosocialdistress.Methods Sixteen patients (9 female, 7 male; average age, 31 years; range, 16 to 67 years) withmultiple cutaneous neurofibromas between March 2010 and February 2012 were includedin the study. All patients were treated with radiosurgical ablation and excision under generalanesthesia.Results All 16 patients were satisfied with the results, when questioned directly during theoutpatient department follow-up. The only complaint from a few patients was minimalscarring, but acceptable results were obtained in the end.Conclusions The radiofrequency procedure is almost bloodless and quick, creating a smallernecrotizing zone. Therefore, instead of employing the time consuming traditional surgery,such as laser therapy and electrosurgical excision, that produces uncertain results and canaffect normal adjacent tissue, treatment of neurofibromas with radiofrequency ablationand excision can be an alternative choice of treatment for patients with a large number ofneurofibromas.
Innervated Cross-Finger Pulp Flap for Reconstruction of the Fingertip
Nae-Ho Lee,Woo-Sik Pae,Si-Gyun Roh,Kwang-Jin Oh
Archives of Plastic Surgery , 2012, DOI: http://dx.doi.org/10.5999/aps.2012.39.6.637
Abstract: Background Fingertip injuries involving subtotal or total loss of the digital pulp are commontypes of hand injuries and require reconstruction that is able to provide stable padding andsensory recovery. There are various techniques used for reconstruction of fingertip injuries,but the most effective method is functionally and aesthetically controversial. Despite somedisadvantages, cross-finger pulp flap is a relatively simple procedure without significantcomplications or requiring special techniques.Methods This study included 90 patients with fingertip defects who underwent cross-fingerpulp flap between September 1998 and March 2010. In 69 cases, neurorrhaphy was performedbetween the pulp branch from the proper digital nerve and the recipient’s sensory nerve forgood sensibility of the injured fingertip. In order to evaluate the outcome of our surgicalmethod, we observed two-point discrimination in the early (3 months) and late (12 to 40months) postoperative periods.Results Most of the cases had cosmetically and functionally acceptable outcomes. The averagedefect size was 1.7×1.5 cm. Sensory return began 3 months after flap application. The twopointdiscrimination was measured at 4.6 mm (range, 3 to 6 mm) in our method and 7.2 mm(range, 4 to 9 mm) in non-innervated cross-finger pulp flaps.Conclusions The innervated cross-finger pulp flap is a safe and reliable procedure for lateraloblique, volar oblique, and transverse fingertip amputations. Our procedure is simple to performunder local anesthesia, and is able to provide both mechanical stability and sensory recovery.We recommend this method for reconstruction of fingertip injuries.
Design of Out-of-Band Protocols to Transmit UHDTV Contents in the CATV Network  [PDF]
Sunsik Roh
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2012, DOI: 10.4236/ijcns.2012.55034
Abstract: The goal of an UHDTV is to broadcast digital video contents which is 16 times the pixel resolution of HDTV. As the resolution is increased, the UHDTV requires a transmission technology to support very high data transfer rate. In this paper, we propose two out-of-band protocols to transmit UHDTV contents in a CATV network: an OOB-based protocol and a DSG-based protocol. The former may be a short term solution which is well suitable for a traditional CATV network and the letter may be a long term solution which is adoptable for a CATV network equipped with DOCSIS functionalities. In order to transfer 200 Mbps UHDTV contents, proposed protocols use a channel bonding mechanism which combines several QAM channels. We propose CATV network architectures to support an UHDTV service with a channel bonding mechanism, and design the format of messages to share the information of bonded channels between a headend and a STB. We develop an OPNET simulator and ascertain successful transmission of UHDTV contents.
Normative Measurements of Grip and Pinch Strengths of 21st Century Korean Population
Jin Hee Shim,Si Young Roh,Jin Soo Kim,Dong Chul Lee
Archives of Plastic Surgery , 2013, DOI: http://dx.doi.org/10.5999/aps.2013.40.1.52
Abstract: Background Measuring grip and pinch strength is an important part of hand injuryevaluation. Currently, there are no standardized values of normal grip and pinch strengthamong the Korean population, and lack of such data prevents objective evaluation of postsurgicalrecovery in strength. This study was designed to establish the normal values of gripand pinch strength among the healthy Korean population and to identify any dependentvariables affecting grip and pinch strength.Methods A cross-sectional study was carried out. The inclusion criterion was being a healthyKorean person without a previous history of hand trauma. The grip strength was measuredusing a Jamar dynamometer. Pulp and key pinch strength were measured with a hydraulicpinch gauge. Intra-individual and inter-individual variations in these variables were analyzedin a standardized statistical manner.Results There were a total of 336 healthy participants between 13 and 77 years of age.As would be expected in any given population, the mean grip and pinch strength wasgreater in the right hand than the left. Male participants (137) showed mean strengthsgreater than female participants (199) when adjusted for age. Among the male participants,anthropometric variables correlated positively with grip strength, but no such correlationswere identifiable in female participants in a statistically significant way.Conclusions Objective measurements of hand strength are an important component ofhand injury evaluation, and population-specific normative data are essential for clinical andresearch purposes. This study reports updated normative hand strengths of the South Koreanpopulation in the 21st century.
Evaluation the Properties of Titanium Matrix Composites by Melting Route Synthesis

Bong-Jae Choi,Si-Young Sung,Myoung-Gyun Kim,Young-Jig Kim,

材料科学技术学报 , 2008,
Abstract: The main purpose of this study is an in-situ synthesis of (TiB TiC) hybrid titanium matrix composites (TMCs) by vacuum induction melting method and to verify its mechanical properties. The melting route was adopted to synthesize the commercial pure titanium (cp Ti) and granular boron carbide (B4C). The reinforcements, the fraction of 10 vol. pct, were formed by adding 1.88 wt pct B4C to cp Ti. After in-situ synthesis of TMCs, electron probe micro-analysis elemental mapping was carried out to confirm the distribution and shape of reinforcements. The cone-on-disk type sliding wear test was also done for the identification of TMCs. It is concluded that (TiB TiC) hybrid TMCs can be in-situ synthesized and has better wear properties than H13.
Stability of the Incompressible Flows with Nonzero Far-Field Velocity
Jaiok Roh
Abstract and Applied Analysis , 2011, DOI: 10.1155/2011/856896
Abstract: We consider the stability of stationary solutions for the exterior Navier-Stokes flows with a nonzero constant velocity ∞ at infinity. For ∞=0 with nonzero stationary solution , Chen (1993), Kozono and Ogawa (1994), and Borchers and Miyakawa (1995) have studied the temporal stability in spaces for 1< and obtained good stability decay rates. For the spatial direction, we recently obtained some results. For ∞≠0, Heywood (1970, 1972) and Masuda (1975) have studied the temporal stability in 2 space. Shibata (1999) and Enomoto and Shibata (2005) have studied the temporal stability in spaces for ≥3. Then, Bae and Roh recently improved Enomoto and Shibata's results in some sense. In this paper, we improve Bae and Roh's result in the spaces for >1 and obtain - stability as Kozono and Ogawa and Borchers and Miyakawa obtained for ∞=0.
Asymptotic Behavior of the Navier-Stokes Equations with Nonzero Far-Field Velocity
Jaiok Roh
Abstract and Applied Analysis , 2011, DOI: 10.1155/2011/369571
Abstract: Concerning the nonstationary Navier-Stokes flow with a nonzero constant velocity at infinity, the temporal stability has been studied by Heywood (1970, 1972) and Masuda (1975) in space and by Shibata (1999) and Enomoto-Shibata (2005) in spaces for . However, their results did not include enough information to find the spatial decay. So, Bae-Roh (2010) improved Enomoto-Shibata's results in some sense and estimated the spatial decay even though their results are limited. In this paper, we will prove temporal decay with a weighted function by using decay estimates obtained by Roh (2011). Bae-Roh (2010) proved the temporal rate becomes slower by if a weighted function is for . In this paper, we prove that the temporal decay becomes slower by where if a weighted function is . For the proof, we deduce an integral representation of the solution and then establish the temporal decay estimates of weighted -norm of solutions. This method was first initiated by He and Xin (2000) and developed by Bae and Jin (2006, 2007, 2008). 1. Introduction When a boat is sailing with a constant velocity , we may think that the water is flowing around the fixed boat with opposite velocity like the water flow around an island. As we have seen, behind the boat the motion of the water is significantly different from other areas, which is called the wake. The motion of nonstationary flow of an incompressible viscous fluid past an isolated rigid body is formulated by the following initial boundary value problem of the Navier-Stokes equations: where is an exterior domain in with a smooth boundary and denotes a given constant vector describing the velocity of the fluid at infinity. For , the temporal decay and weighted estimates for solutions of (1.1) have been studied in [1–13]. In this paper, we consider a nonzero constant . We set in (1.1) and have Consider the following linear equations of (1.2): which is referred to as the Oseen equations; see [14]. In order to formulate the problem (1.3), Enomoto and Shibata [15] used the Helmholtz decomposition: where , The Helmholtz decomposition of was proved by Fujiwara-Morimoto [16], Miyakawa [17], and Simader-Sohr [18]. Let be a continuous projection from onto . By applying into (1.3) and setting , one has where the domain of is given by Then, Enomoto and Shibata [15] proved that generates an analytic semigroup which is called the Oseen semigroup (one can also refer to [17, 19]) and obtained the following properties. Proposition 1.1. Let and assume that . Let . Then, where and , where and . By using Proposition 1.1, Bae-Jin [20] considered
A Facile Inhibitor Screening of Hepatitis C Virus NS3 Protein Using Nanoparticle-Based RNA
Changhyun Roh
Biosensors , 2012, DOI: 10.3390/bios2040427
Abstract: Globally, over hundreds of million people are infected with the hepatitis C virus: the global rate of death as a direct result of the hepatitis C virus has increased remarkably. For this reason, the development of efficient drug treatments for the biological effects of the hepatitis C virus is highly necessary. We have previously shown that quantum dots (QDs)-conjugated RNA oligonucleotide can recognize the hepatitis C virus NS3 protein specifically and sensitively. In this study, we elucidated that this biochip can analyze inhibitors to the hepatitis C virus NS3 protein using a nanoparticle-based RNA oligonucleotide. Among the polyphenolic compounds examined, 7,8,4 '-trihydroxyisoflavone and 6,7,4 '-trihydroxyisoflavone demonstrated a remarkable inhibition activity on the hepatitis C virus NS3 protein. Both 7,8,4 '-trihydroxyisoflavone and 6,7,4 '-trihydroxyisoflavone attenuated the binding affinity in a concentrated manner as evidenced by QDs conjugated RNA oligonucleotide. At a concentration of 0.01 μg·mL ?1, 7,8,4 '-trihydroxyisoflavone and 6,7,4 '-trihydroxyisoflavone showed more than a 30% inhibition activity of a nanoparticle-based RNA oligonucleotide biochip system.
A facile inhibitor screening of SARS coronavirus N protein using nanoparticle-based RNA oligonucleotide
Roh C
International Journal of Nanomedicine , 2012, DOI: http://dx.doi.org/10.2147/IJN.S31379
Abstract: facile inhibitor screening of SARS coronavirus N protein using nanoparticle-based RNA oligonucleotide Original Research (2164) Total Article Views Authors: Roh C Published Date May 2012 Volume 2012:7 Pages 2173 - 2179 DOI: http://dx.doi.org/10.2147/IJN.S31379 Received: 02 March 2012 Accepted: 21 March 2012 Published: 03 May 2012 Changhyun Roh Division of Biotechnology, Advanced Radiation Technology Institute (ARTI), Korea Atomic Energy Research Institute (KAERI), Jeongeup, Republic of Korea Abstract: Hundreds of million people worldwide have been infected with severe acute respiratory syndrome (SARS), and the rate of global death from SARS has remarkably increased. Hence, the development of efficient drug treatments for the biological effects of SARS is highly needed. We have previously shown that quantum dots (QDs)-conjugated RNA oligonucleotide is sensitive to the specific recognition of the SARS-associated coronavirus (SARS-CoV) nucleocapsid (N) protein. In this study, we found that a designed biochip could analyze inhibitors of the SARS-CoV N protein using nanoparticle-based RNA oligonucleotide. Among the polyphenolic compounds examined, (-)-catechin gallate and (-)-gallocatechin gallate demonstrated a remarkable inhibition activity on SARS-CoV N protein. (-)-catechin gallate and (-)-gallocatechin gallate attenuated the binding affinity in a concentrated manner as evidenced by QDs-conjugated RNA oligonucleotide on a designed biochip. At a concentration of 0.05 μg mL–1, (-)-catechin gallate and (-)-gallocatechin gallate showed more than 40% inhibition activity on a nanoparticle-based RNA oligonucleotide biochip system.
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