http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Riemann Solvers in Relativistic Hydrodynamics: Basics and Astrophysical Applications
IBANEZ JOSE MA. The Korean Astronomical Society 2001 Journal of The Korean Astronomical Society Vol.34 No.4
My contribution to these proceedings summarizes a general overview on High Resolution Shock Capturing methods (HRSC) in the field of relativistic hydrodynamics with special emphasis on Riemann solvers. HRSC techniques achieve highly accurate numerical approximations (formally second order or better) in smooth regions of the flow, and capture the motion of unresolved steep gradients without creating spurious oscillations. In the first part I will show how these techniques have been extended to relativistic hydrodynamics, making it possible to explore some challenging astrophysical scenarios. I will review recent literature concerning the main properties of different special relativistic Riemann solvers, and discuss several 1D and 2D test problems which are commonly used to evaluate the performance of numerical methods in relativistic hydrodynamics. In the second part I will illustrate the use of HRSC methods in several astrophysical applications where special and general relativistic hydrodynamical processes play a crucial role.
30kW DC-DC Converters with Regenerative Mode for Electric Cars
Ibanez, Federico,Vadillo, Javier,Maiza, Miguel Martinez-Iturralde,Echeverria, Jose Martin The Korean Institute of Power Electronics 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.2
This paper presents a design of a 30kW 250V/530V bidirectional DC-DC converter to be used in an electrical car. A detailed explanation of the design is given. The system uses two phase shifted half bridge (boost and buck) topologies to reduce the ripple current in the output capacitor. The converter has an efficiency of 95% at nominal power. It works as a constant voltage in one direction and as a constant current in the other to charge the batteries. Simulations and measurement are done at high power to test the efficiency.
30kW DC-DC Converters with Regenerative Mode for Electric Cars
Federico Ibanez,Javier Vadillo,Miguel Martinez-Iturralde Maiz,Jose Martin Echeverria 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.2
This paper presents a design of a 30kW 250V/530V bidirectional DC-DC converter to be used in an electrical car. A detailed explanation of the design is given. The system uses two phase shifted half bridge (boost and buck) topologies to reduce the ripple current in the output capacitor. The converter has an efficiency of 95% at nominal power. It works as a constant voltage in one direction and as a constant current in the other to charge the batteries. Simulations and measurement are done at high power to test the efficiency.
Simple QoE estimation model for low capacity VoIP phones
Jung, Y,Ibanez, A A,Manzano, C IET 2011 Electronics letters Vol.47 No.3
<P>Proposed is a simple quality of experience (QoE) estimations model for VoIP applications in end devices such as IP phones. It is a model based on the accumulated burst metric, which corresponds to the fraction of the sum of the whole burst periods within all alternating gap/burst periods that have occurred since the beginning of the packet stream reception. Estimation errors caused when using only the accumulated burst metric as the input metric of the VoIP quality estimation model are explored.</P>
Analysis of Cu in Mezcal Commercial Samples using Square Wave Anodic Stripping Voltammetry
Salinas, Gerardo,Ibanez, Jorge G.,Vasquez-Medrano, Ruben,Frontana-Uribe, Bernardo A. The Korean Electrochemical Society 2018 Journal of electrochemical science and technology Vol.9 No.4
High concentration of copper in mezcal, a representative Mexican spirituous alcoholic beverage, is a serious problem due to the damage that it may cause to human health. A cyclic voltammetry and square wave anodic stripping voltammetry study of copper (II) in three commercial mezcal samples based on glassy carbon electrode response was undertaken. The analysis was developed using a simulated matrix solution ($EtOH/H_2O$ (1:1), 0.1 M $LiClO_4$ and AcOH/AcONa 0.05 M/0.008 M), with Cu (II) concentrations in the range 0 - 1 ppm. Direct electrochemical analysis of mezcal samples was complicated by the presence of different organic compounds in the matrix. The analytical signal of Cu (II) in the spirituous was notably improved and the interferences caused by organic compounds were minimized, by diluting the mezcal samples 10% with $EtOH/H_2O$ (1:1) solution. An efficient quantification of Cu (II) was obtained from the calibration curve by the SWASV and using the internal standard method (Cd (II)) in commercial samples (1.2-6.7 ppm); the results were correlated satisfactorily with the values obtained by AAS.
Quality-based Charging Mechanism Design for VoIP Test
정윤찬,Al Ann Ibanez 에스케이텔레콤 (주) 2011 Telecommunications Review Vol.21 No.5
Providing Quality-of Service (QoS) guarantees in VoIP applications becomes more challenging in wireless and mobile networks. One of the important issues is to find a mechanism that can probe to what degree the users are satisfied with their experiences and give them service quality guarantees with varying prices depending on the network performance they may experience. In this paper, we use a methodology of listening and identifying word-by-word in order to obtain the criterion metric, which enables users to identify whether they are satisfied with their experiences or not. Investigating the relationship between the gap ratio and PESQ MOS, we derive the charging ratio, which can be used as the proportion of quality-based prices to ''delivered packet amount''-based prices. Finally, we design the charging ratio model which can be a key component of quality-based VoIP charging mechanism.
A Tattooing for the Child Health Records Design that can Save Lives
Bong-Keum Jeong,Mon-Chu Chen,Jesus Ibanez Martinez 한국HCI학회 2016 한국HCI학회 학술대회 Vol.2016 No.1
The purpose of this research is to provide communication design recommendations that can help solve problems regarding children’s health record systems in Africa. Additionally, this research aims to test an ethnography method in a broad way in order to find a design solution within African culture. The broad concept of ethnography accepts situations where a researcher is not assimilated to African culture or an African social group to be also ethnographic research as long as culture elements are included. We conducted literature reviews and stakeholder interviews on the topics of children’s health and vaccination status, as well as African tattoos. The research subjects were children, parents, health workers, and surveyors, and this research tried to develop a design that satisfies all of these subjects’ needs. We also intend to include characteristics of African culture in a health service design process where tattoos as a design element are reborn as a symbol of children’s lives being saved.