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Search Results: 1 - 10 of 26024 matches for " Kwang Hyuck Lee "
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Hepatobiliary scintigraphy for detecting biliary strictures after living donor liver transplantation
Yu Jin Kim,Kyu Taek Lee,Young Cheol Jo,Kwang Hyuck Lee
World Journal of Gastroenterology , 2011, DOI: 10.3748/wjg.v17.i21.2626
Abstract: AIM: To investigate the diagnostic accuracy of hepatobiliary scintigraphy (HBS) in detecting biliary strictures in living donor liver transplantation (LDLT) patients. METHODS: We retrospectively reviewed 104 adult LDLT recipients of the right hepatic lobe with duct-to-duct anastomosis, who underwent HBS and cholangiography. The HBS results were categorized as normal, parenchymal dysfunction, biliary obstruction, or bile leakage without re-interpretation. The presence of biliary strictures was determined by percutaneous cholangiography or endoscopic retrograde cholangiopancreatography (ERCP). RESULTS: In 89 patients with biliary strictures, HBS showed biliary obstruction in 50 and no obstruction in 39, for a sensitivity of 56.2%. Of 15 patients with no biliary strictures, HBS showed no obstruction in 11, for a specificity of 73.3%. The positive predictive value (PPV) was 92.6% (50/54) and the negative predictive value (NPV) was 22% (11/50). We also analyzed the diagnostic accuracy of the change in bile duct size. The sensitivity, NPV, specificity, and PPV were 65.2%, 27.9%, 80% and 95%, respectively. CONCLUSION: The absence of biliary obstruction on HBS is not reliable. Thus, when post-LDLT biliary strictures are suspected, early ERCP may be considered.
Predictive factors associated with malignancy of intraductal papillary mucinous pancreatic neoplasms
Jin Hee Lee, Kyu Taek Lee, Jongwook Park, Sun Youn Bae, Kwang Hyuck Lee, Jong Kyun Lee, Kee-Taek Jang, Jin Seok Heo, Seong Ho Choi, Dong Wook Choi, Jong Chul Rhee
World Journal of Gastroenterology , 2010,
Abstract: AIM: To identify preoperative predictive factors associated with malignancy of intraductal papillary mucinous neoplasms (IPMNs) of the pancreas.METHODS: Between April 1995 and April 2010, 129 patients underwent surgical resection for IPMNs at our institute and had confirmed pathologic diagnoses. The medical records were retrospectively reviewed and immunohistochemical staining for mucin (MUC) in pancreatic tissues was performed.RESULTS: Univariate analysis showed that the following five variables were closely associated with malignant IPMNs preoperatively: absence of extrapancreatic malignancy; symptoms; tumor size > 4 cm; main pancreatic duct (MPD) size > 7 mm; and lymph node enlargement on preoperative computed tomography (CT). Multivariate analysis revealed that the following two factors were significantly associated with malignant IPMNs preoperatively: MPD size > 7 mm [odds ratio (OR) = 2.50]; and lymph node enlargement on preoperative CT (OR = 3.57). No significant differences in the expression of MUC1, MUC2 and MUC5AC were observed between benign and malignant IPMNs.CONCLUSION: MPD size > 7 mm and preoperative lymph node enlargement on CT are useful predictive factors associated with malignancy of IPMNs.
The 'Harmonizing Optimal Strategy for Treatment of coronary artery stenosis - sAfety & effectiveneSS of drug-elUting stents & antiplatelet REgimen' (HOST-ASSURE) trial: study protocol for a randomized controlled trial
Kyung Park, Byoung-Eun Park, Si-Hyuck Kang, Jin-Joo Park, Seung-Pyo Lee, Kwang Cha, Jay Rhew, Hui-Kyoung Jeon, Eun Shin, Ju Oh, Myung-Ho Jeong, Sanghyun Kim, Kyung-Kuk Hwang, Jung-Han Yoon, Sung Lee, Tae-Ho Park, Keon Moon, Hyuck-Moon Kwon, In-Ho Chae, Hyo-Soo Kim, On behalf of the HOST investigators
Trials , 2012, DOI: 10.1186/1745-6215-13-29
Abstract: In the 'Harmonizing Optimal Strategy for Treatment of coronary artery stenosis - sAfety & effectiveneSS of drug-elUting stents & antiplatelet REgimen' (HOST-ASSURE) trial, approximately 3,750 patients are being prospectively and randomly assigned in a 2 × 2 factorial design according to the type of stent (PtCr-EES vs CoCr-ZES) and antiplatelet regimen (TAT vs DDAT). The first primary endpoint is target lesion failure at 1 year for the stent comparison, and the second primary endpoint is net clinical outcome at 1 month for comparison of antiplatelet therapy regimen.The HOST-ASSURE trial is the largest study yet performed to directly compare the efficacy and safety of the PtCr-EES versus CoCr-ZES in an 'all-comers' population. In addition, this study will also compare the clinical outcome of TAT versus DDAT for 1-month post PCI.ClincalTrials.gov number NCT01267734.Various second-generation drug-eluting stents (DES) have been developed in the hopes of improving both efficacy and safety compared with first-generation DES. Cumulative evidence is building suggesting that compared with the paclitaxel-eluting stent, the second-generation everolimus-eluting stent (EES; Xience V, Abbott Vascular, Santa Clara, CA, USA, Promus, Boston Scientific, Natick, MA, USA) is more effective and safe [1-3], and compared with the sirolimus-eluting stent, it has similar efficacy with a trend toward better safety [4-6]. The next addition to the second-generation DES market has been the zotarolimus-eluting stent (ZES; Resolute, Medtronic, Minneapolis, MN, USA), which showed equivalent outcome compared with the EES in the RESOLUTE All-Comers randomized trial [7]. Both EES and ZES are based on a cobalt chromium alloy stent. Most recently, a newly developed stent alloy, the platinum chromium alloy, was incorporated with everolimus to create the platinum chromium-based EES (PtCr-EES), the Promus Element stent (Boston Scientific, Natick, MA, USA). There are limited data on the clinical efficacy an
Noncentral extension of the $AdS_{5} \times S^{5}$ superalgebra: supermultiplet of brane charges
Sangmin Lee,Jeong-Hyuck Park
Physics , 2004, DOI: 10.1088/1126-6708/2004/06/038
Abstract: We propose an extension of the su(2,2|4) superalgebra to incorporate the $F1/D1$ string charges in type IIB string theory on the $AdS_{5} \times S^{5}$ background, or the electro-magnetic charges in the dual super Yang-Mills theory. With the charges introduced, the superalgebra inevitably undergoes a noncentral extension, as noted recently in [1]. After developing a group theoretical method of obtaining the noncentral extension, we show that the charges form a certain nonunitary representation of the original unextended superalgebra, subject to some constraints. We solve the constraints completely and show that, apart from the su(2,2|4) generators, there exist 899 complex brane charges in the extended algebra. Explicitly we present all the super-commutators among them.
5D Actions for 6D Self-Dual Tensor Field Theory
Kimyeong Lee,Jeong-Hyuck Park
Physics , 2000, DOI: 10.1103/PhysRevD.64.105006
Abstract: We present two equivalent five-dimensional actions for six-dimensional (N,0) N=1,2 supersymmetric theories of self-dual tensor whose one spatial dimension is compactified on a circle. The Kaluza-Klein tower consists of a massless vector and infinite number of massive self-dual tensor multiplets living in five-dimensions. The self-duality follows from the equation of motion. Both actions are quadratic in field variables without any auxiliary field. When lifted back to six-dimensions, one of them gives a supersymmetric extension of the bosonic formulation for the chiral two-form tensor by Perry and Schwarz.
Developing Mobile Collaborative Learning Applications for Mobile Users
Kwang B Lee
International Journal of Interactive Mobile Technologies (iJIM) , 2011, DOI: 10.3991/ijim.v5i4.1823
Abstract: With the rapid growth wireless communication technologies, the number of mobile applications have been developing. One of them is approached for mobile learning area since it is unique in its own way and offers learning opportunities anywhere and anytime. Mobile collaborative learning (MCL) is a small group learning application based on mobile devices. MCL is a new exciting research area in which students can earn knowledge about a topic and concept via communicating with others by a mobile device. This paper introduces describes the theoretical and technical foundations for designing and developing an effective MCL environment. Also, the paper describes a new approach for building the MCL application towards mobile technology. The prototype will be constructed using Android operating system with suggesting necessary infrastructure and middleware. Finally, the paper include the result of a usability test to find valuable hidden facilitating issues to efficiently access and obtain the class contents in collaborative learning environment.
Three-level anterior cervical discectomy and fusion in elderly patients with wedge shaped tricortical autologous graft: A consecutive prospective series
Lee Suk,Oh Kwang,Yoon Kwang,Lee Sung
Indian Journal of Orthopaedics , 2008,
Abstract: Background: Treatment of multilevel cervical spondylotic myelopathy/radiculopathy is a matter of debate, more so in elderly patients due to compromised physiology. We evaluated the clinical and radiological results of cervical fusion, using wedge-shaped tricortical autologous iliac graft and Orion plate for three-level anterior cervical discectomy in elderly patients. Materials and Methods: Twelve elderly patients with mean age of 69.7 years (65-76 years) were treated between April 2000 and March 2005, for three-level anterior cervical discectomy and fusion, using wedge-shaped tricortical autologous iliac graft and Orion plate. Outcome was recorded clinically according to Odom′s criteria and radiologically in terms of correction of lordosis angle and intervertebral disc height span at the time of bony union. The mean follow-up was 29.8 months (12-58 months). Results: All the patients had a complete recovery of clinical symptoms after surgery. Postoperative score according to Odom′s criteria was excellent in six patients and good in remaining six. Bony union was achieved in all the patients with average union time of 12 weeks (8-20 weeks). The mean of sum of three segment graft height collapse was 2.50 mm (SD = 2.47). The average angle of lordosis was corrected from 18.2° (SD = 2.59°) preoperatively to 24.9° (SD = 4.54°) at the final follow-up. This improvement in the radiological findings is statistically significant (P < 0.05). Conclusion: Cervical fusion with wedge-shaped tricortical autologous iliac graft and Orion plate for three-level anterior cervical discectomy is an acceptable technique in elderly patients. It gives satisfactory results in terms of clinical outcome, predictable early solid bony union, and maintenance of disc space height along with restoration of cervical lordosis.
Estimating higher order perturbative coefficients using Borel transform
Kwang Sik Jeong,Taekoon Lee
Physics , 2002, DOI: 10.1016/S0370-2693(02)02976-3
Abstract: A new method of estimating higher order perturbative coefficients is discussed. It exploits the rapid, asymptotic growth of perturbative coefficients and the information on the singularities in the complex Borel plane. A comparison with other methods is made in several Quantum Chromodynamics (QCD) expansions.
BPS equations in Six and Eight Dimensions
Dongsu Bak,Kimyeong Lee,Jeong-Hyuck Park
Physics , 2002, DOI: 10.1103/PhysRevD.66.025021
Abstract: We consider the maximal supersymmetric pure Yang-Mills theories on six and eight dimensional space. We determine, in a systematic way, all the possible fractions of supersymmetry preserved by the BPS states and present the corresponding `self-dual' BPS equations. In six dimensions the intrinsic one has 1/4 supersymmetry, while in eight dimensions, 1/16, 2/16, ..., 6/16. We apply our results to some explicit BPS configurations of finite or infinite energy on commutative or noncommutative spaces.
Comments on Noncommutative Gauge Theories
Dongsu Bak,Kimyeong Lee,Jeong-Hyuck Park
Physics , 2000, DOI: 10.1016/S0370-2693(01)00158-7
Abstract: We study the gauge theories on noncommutative space. We employ the idea of the covariant position to understand the linear and angular momenta, the center of mass position, and to express all gauge invariant observables including the Wilson line. In addition, we utilize the universality of the U(1) gauge theory, which originates from the underlying matrix theory, to analyze various solitons on U(N) theories, like the unstable static vortex solutions in two dimensions and BPS dyonic fluxon solutions.
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