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Search Results: 1 - 10 of 9744 matches for " Sang-Ho Suh "
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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.
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.
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.
On Initialization of Ml DOA Cost Function for Uca
Joon-Ho Lee;Sang-Ho Jo
PIER M , 2008, DOI: 10.2528/PIERM08052702
Abstract: Maximum likelihood (ML) direction-of-arrival (DOA) estimation is essentially an optimization of multivariable nonlinear cost function. Since the final estimate is highly dependent on the initial estimate, an initialization is critical in nonlinear optimization. Alternating Projection (AP) initialization has been proposed as computationally efficient method for the initialization of the ML DOA cost function. In this paper, we propose a multi-dimensional (M-D) search scheme of uniform exhaustive search and improved exhaustive search. Improved exhaustive search is used to reduce the computational load of uniform exhaustive search. In the improved exhaustive search algorithm, the two-step procedure is applied to reduce the computational load of the uniform exhaustive search initialization scheme. In numerical results, it is shown that the performance of the proposed scheme is better than that of AP initialization.
Effects of $N(2000)\, 5/2^+$, $N(2060)\,5/2^-$, $N(2120)\,3/2^-$, and $N(2190)\,7/2^-$ on $K^*Λ$ photoproduction
Sang-Ho Kim,Atsushi Hosaka,Hyun-Chul Kim
Physics , 2014, DOI: 10.1103/PhysRevD.90.014021
Abstract: We reinvestigate $K^*\Lambda(1116)$ photoproduction off the nucleon target, based on an effective Lagrangian approach. We include higher nucleon resonances such as $N(2000)\, 5/2^+$, $N(2060)\,5/2^-$, $N(2120)\,3/2^-$, and $N(2190)\,7/2^-$, of which the data are taken from the 2012 edition of Review of Paritcle Physics, in addition to the $t$-channel diagrams ($K$, $K^*$, and $\kappa$), the $s$-channel nucleon, and $u$-channel hyperon($\Lambda$, $\Sigma$, and $\Sigma^*$) contributions. We find that the $N(2120)\,3/2^-$ and $N(2190)\,7/2^-$ resonances are essential in describing the new CLAS data for charged $K^*$ photoproduction. On the other hand, they rarely affect for neutral $K^*$ photoproduction.
Efficient Design Scheme of Superconducting Cavity
Sang-ho Kim,Marc Doleans,Yoon Kang
Physics , 2000,
Abstract: For many next-generation high intensity proton accelerator applications including the Spallation Neutron Source (SNS), superconducting (SC) RF provides the technology of choice for the linac. In designing the superconducting cavity, several features, such as peak fields, inter-cell coupling, mechanical stiffness, field flatness, external Q, manufacturability, shunt impedance, higher order mode (HOM), etc., should be considered together. A systematic approach to determine the optimum cavity shape by exploring the entire geometric space of the cavity has been found. The most efficient use of RF energy can be accomplished by adjusting the cell shape. A small region in parameter space satisfying all reasonable design criteria has been found. With this design procedure, choosing the optimum shape is simplified. In this paper, the whole design procedure of this optimisation scheme is explained and applied to the SNS cavity design.
Development of Standardization and Management System for the Severity of Unpaved Test Courses
Do-Kyung Kang,Sang-Ho Lee,Sang-Hwa Goo
Sensors , 2007, DOI: 10.3390/s7092004
Abstract: The vibration environment essentially accompanied by vehicle operation on theground is determined by the shape of road surface, which is called as profile. This paperfocuses on the development of profile measurement and severity analysis system forunpaved test courses. In general, the profile and severity of unpaved road is an importantissue in the reliability of endurance test. In order to measure and maintain unpaved roadprofile and severity, it is necessary to develop a profilometer system. The developedprofilometer system is composed of data processing computer, power unit, air compressorand sensors(encoder, vertical gyro and laser displacement). This study presents themeasuring system configuration, measurement principle of road profile and analysismethod of road characteristics used at CPG (Chang-won Proving Ground) for this purpose.In order to standardize and manage the severity of unpaved test courses, neural network isapplied
Threat Description of the Network-Based Intrusion Detection System (NIDS) Protection Profile
Sang-ho Kim,Chun-seong Leem,Eun-ser Lee
Asian Journal of Information Technology , 2012,
Abstract: Evaluation has been the traditional means of providing assurance. The Common Criteria (CC) defines a Protection Profile (PP) that defines the security environments and specifies the security requirements and protections of the product to be evaluated. The security environments consist of assumptions, threats and organizational security policies, so the editor of the PP must describe the threats for the PP. In this study we propose a new method for the description of the threats for the PP by introducing the concept of the assets protected by Target of Evaluations (TOE) and show some merits by applying that concept to the Network-based Intrusion Detection System (NIDS).
Azimuth Beam Pattern Synthesis for Airborne SAR System Optimization
Sang-Ho Lim;Jung-Hoon Han;Se-Young Kim;Noh-Hoon Myung
PIER , 2010, DOI: 10.2528/PIER10061901
Abstract: The limitation of the pulse repetition frequency (PRF) of an airborne synthetic aperture radar (SAR) system is not a serious problem to obtain high azimuth resolution and wide swath imaging compared with a spaceborne SAR system. Hence, continuous high azimuth resolution imagery over a wide area can be obtained using an antenna having a wide beamwidth. Since a small antenna with a large beamwidth has very low gain, which results in difficulty in detection; the azimuth beam pattern optimization of a large active phased array antenna is needed for airborne SAR system optimization. To improve the airborne SAR system performance, such as the noise-equivalent sigma zero (σ), the azimuth resolution, the radiometric accuracy (RA), and the azimuth ambiguity ratio (AAR), we present an optimal azimuth beam pattern mask template and suggest an azimuth beam pattern satisfying the mask template using the particle swarm optimization (PSO). The mode having the proposed beam pattern guarantees continuous and high resolution images, simultaneously. Using a point target simulation, the advantages of the mode are shown compared to strip-map and spotlight modes.
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