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Search Results: 1 - 10 of 9480 matches for " Lok Sang Ho "
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Tax Reform for a Fairer, More Vibrant Economy  [PDF]
Lok Sang Ho, Tianle Zhang
Modern Economy (ME) , 2016, DOI: 10.4236/me.2016.78092
Abstract: The paper reviews the recent literature on tax reform, and recommends abolishing the profits tax and treating personal incomes from all sources as taxable, including capital gains and dividends. Abolition of the profits tax will vastly improve the investment environment and eliminate wasteful distortions. We also offer an intermediate “gradualist” approach involving halving the profit tax rate and taxing half of dividends and capital gains. We augmented a model proposed by Chetty and Saez [1] to incorporate the effects of manager effort for investment and showed the strong adverse effect of the profit tax on investment. Given that successive increments in total personal incomes from all sources are typically characterized by increasing intensity in economic rent, a progressive tax structure with high marginal tax rates at the top and wide tax bands is not only more equitable, but can be justified on efficiency grounds.
The Role of Adjuvant Therapy in Gastrointestinal Stromal Tumor after Operative Treatment
Ka-Ho Lok
Clinical Medicine Insights: Gastroenterology , 2012,
Abstract: The treatment for localized advance gastrointestinal stromal tumor (GIST) is far from ideal. Up to 50% of patient developed post-operative recurrence and died within 5 years. Recently, imatinib was found to significantly improve recurrence-free survival in post-operative patients. The role of adjuvant therapy in high risk GIST patients is discussed.
Arteriovenous Graft Modeling and Hemodynamic Interpretation  [PDF]
Hyoung-Ho Kim, Young Ho Choi, Sang-Ho Suh, Young Hoon Jung, Young Ho So, Jeong Sang Lee
Open Journal of Fluid Dynamics (OJFD) , 2012, DOI: 10.4236/ojfd.2012.24A040
Abstract: Arteriovenous graft (AVG) is artificially made with graft for hemodialysis in the patients with renal failure. Stenosis in the arterial or venous anastomosis of AVG results in its malfunction. Here, we made an AVG hemodynamic model with three different anastomotic angles (20°, 30°, 40°) and analyzed hemodynamic parameters such as velocity vectors, WSS and OSI in the arterial and venous anastomosis to find what helps in developing new surgical techniques to reduce stenosis in the anastomosis. Recirculation flow, low WSS and high OSI in the venous anastomosis were demonstrated in 30° and 40° models, and recirculation flow, high WSS and high OSI in the arterial anastomosis were shown in all models. Conclusively, higher anastomosis angle in the venous anastomosis cause stenosis, but stenosis in the arterial anastomosis happens irregardless of anastomosis angle.
QCMC: Quasi-conformal Parameterizations for Multiply-connected domains
Kin Tat Ho,Lok Ming Lui
Computer Science , 2014,
Abstract: This paper presents a method to compute the {\it quasi-conformal parameterization} (QCMC) for a multiply-connected 2D domain or surface. QCMC computes a quasi-conformal map from a multiply-connected domain $S$ onto a punctured disk $D_S$ associated with a given Beltrami differential. The Beltrami differential, which measures the conformality distortion, is a complex-valued function $\mu:S\to\mathbb{C}$ with supremum norm strictly less than 1. Every Beltrami differential gives a conformal structure of $S$. Hence, the conformal module of $D_S$, which are the radii and centers of the inner circles, can be fully determined by $\mu$, up to a M\"obius transformation. In this paper, we propose an iterative algorithm to simultaneously search for the conformal module and the optimal quasi-conformal parameterization. The key idea is to minimize the Beltrami energy subject to the boundary constraints. The optimal solution is our desired quasi-conformal parameterization onto a punctured disk. The parameterization of the multiply-connected domain simplifies numerical computations and has important applications in various fields, such as in computer graphics and vision. Experiments have been carried out on synthetic data together with real multiply-connected Riemann surfaces. Results show that our proposed method can efficiently compute quasi-conformal parameterizations of multiply-connected domains and outperforms other state-of-the-art algorithms. Applications of the proposed parameterization technique have also been explored.
Bertrand-Cournot Comparison in a Mixed Duopoly with Advertisement  [PDF]
Chul-Hi Park, Dmitriy Li, Sang-Ho Lee
Theoretical Economics Letters (TEL) , 2016, DOI: 10.4236/tel.2016.62017
Abstract: We examine the Bertrand-Cournot comparison with advertisement in a differentiated mixed duopoly market, and compare with the social optimum. We show that not only both firms’ quantities but also both firms’ advertisements are higher (lower) in Cournot (Bertrand) than the social optimum. Thus, both firms engage in excessive (insufficient) advertisement in Cournot (Bertrand). We also show that despite lower both firms’ prices in Cournot, both firms’ profits and social welfare are strictly higher in Bertrand and thus, both firms prefer Bertrand to Counrnot.
Prioritizing the Best Areas for Treated Wastewater Use Using RCP 8.5  [PDF]
Sang-Mook Jeon, Eun-Sung Chung, Yeonjoo Kim, Sang-ho Lee
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.41B011
Abstract: The goal of this study is to develop a new framework that prioritizes the best sites for treated wastewater (TWW) use considering climate change impacts. Fuzzy TOPSIS which is a kind of multi-criteria decision making techniques was introduced to reflect the uncertainty of input data and criteria weighting values. Representative concentration pathway 8.5 scenario was included into the hydrologic simulations for the climate change impact to hydrologic regimes using hydrological simulation program-Fortran (HSPF). Furthermore, all year scenarios were considered to determine the rankings, respectively. It can take into consideration the uncertainty of time periods which always exists in all climate change scenarios. This study can be a baseline to start to combine the fuzzy multi-criteria decision making techniques with robust prioritization for climate change adaptation strategies.
Spherical Conformal Parameterization of Genus-0 Point Clouds for Meshing
Pui Tung Choi,Kin Tat Ho,Lok Ming Lui
Computer Science , 2015,
Abstract: Point cloud is the most fundamental representation of 3D geometric objects as it provides the most exact information of them. Analyzing and processing point cloud surfaces is important in computer graphics and computer vision. However, most of the existing algorithms for surface analysis require connectivity information. Therefore, it is desirable to develop a mesh structure on point clouds. This task can be simplified with the aid of a parameterization. In particular, conformal parameterizations are advantageous in preserving the geometric information of the point cloud data. In this paper, we extend a state-of-the-art spherical conformal parameterization algorithm for genus-0 closed meshes to the case of point clouds, using an improved approximation of the Laplace-Beltrami operator on data points. Then, we propose an iterative scheme called the North-South reiteration for achieving a spherical conformal parameterization. A balancing scheme is introduced to enhance the distribution of the spherical parameterization. High quality triangulations and quadrangulations can then be built on the point clouds with the aid of the parameterizations. Also, the meshes generated are guaranteed to be genus-0 closed meshes. Moreover, using our proposed spherical conformal parameterization, multilevel representations of point clouds can be easily constructed. Experimental results demonstrate the effectiveness of our proposed framework.
Choledochal varices bleeding: A case report
Chi Ho Ng,Lawrence Lai,Ka Ho Lok,Kin Kong Li
World Journal of Gastrointestinal Endoscopy , 2010,
Abstract: Choledochal varices are a rare cause of hemobilia associated with chronic portal vein thrombosis. We present a case of chronic portal vein thrombosis complicated with bleeding from choledochal varices. The presentation, clinical manifestations and management are described.
Aging Risk and Health Care Expenditure in Korea
Byongho Tchoe,Sang-Ho Nam
International Journal of Environmental Research and Public Health , 2010, DOI: 10.3390/ijerph7083235
Abstract: This paper analyzes the impact of population aging on health care expenditures in Korea. Examination of the age-expenditure profile reveals that health care resources are allocated more for the older cohort of population over time, suggesting significant growth of health care expenditures due to population aging. We contend, however, that population aging is considered as a parameter rather than an independent variable to explain rising health care expenditures. This paper shows that population aging is not found to be a significant determinant of health care expenditures according to the econometric analysis using OECD health data and time-series data for Korea. Using the components decomposition method, which measures the contribution of each component of health care expenditure, we estimate that population aging contributes only less than 10 percent.
A note on f-derivations of BCC-algebras
Sang Moon Lee,Kyung Ho Kim
Pure Mathematical Sciences , 2012,
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