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91.
92.
Dinh Vinh Do Forgez C. El Kadri Benkara K. Friedrich G. 《Vehicular Technology, IEEE Transactions on》2009,58(8):3930-3937
Most methods for state-of-charge or state-of-health prognostics are impedance based. Impedance models must be as simple as possible to be implemented on embedded applications but as accurate as possible to represent the main electrochemical phenomena. The parameters of such models can be identified using impedance spectroscopy. However, the electrochemical features change in relation to numerous parameters, such as temperature or aging, which involves updating the model of the battery online. This paper deals with the use of an extended Kalman filter (EKF) for the observation of the parameters of a Li-ion battery lumped model. First, this paper will focus on the electrical model that can be used to represent the main electrochemical phenomena in the battery. Then, mathematical considerations about the EKF are reminded to be applied to the observation of the impedance parameters of the battery. This method has been validated on an urban driving cycle of a hybrid electric vehicle. 相似文献
93.
We show that 3 nm wide cobalt-iron alloy nanowires can be synthesized by simple wet chemical electroless deposition inside tubular Tobacco mosaic virus particles. The method is based on adsorption of Pd(II) ions, formation of a Pd catalyst, and autocatalytic deposition of the alloy from dissolved metal salts, reduced by a borane compound. Extensive energy-filtering TEM investigations at the nanoscale revealed that the synthesized wires are alloys of Co, Fe, and Ni. We confirmed by high-resolution TEM that our alloy nanowires are at least partially crystalline, which is compatible with typical Co-rich alloys. Ni traces bestow higher stability, presumably against corrosion, as also known from bulk CoFe. Alloy nanowires, as small as the ones presented here, might be used for a variety of applications including high density data storage, imaging, sensing, and even drug delivery. 相似文献
94.
Ahmet?Rizaner Hasan?Amca Kadri?Hac?o?lu Ali?H.?UlusoyEmail author 《Wireless Personal Communications》2005,34(4):359-371
Multiuser detection techniques are known to be effective to counter the presence of multiuser interference in code division
multiple access channels. Multiuser detectors can provide excellent performance only when the channel impulse responses of
all the users are precisely known. Hence, channel estimation becomes a challenging issue in mobile communication systems.
In this paper, we address the problem of efficient maximum likelihood mobile radio channel estimation at high channel efficiency
that requires a short training sequence along with the known spreading sequence. The proposed system can be employed in both
the uplink and downlink of a heavily loaded multiuser CDMA system. The extension of the approach with unknown users' delays
are also proposed. We present results that show the success of this method in recovering the transmitted bits with a relatively
small number of preamble bits.
Ahmet Rizaner was born in Larnaca, Cyprus, on January 31, 1974. He received the B.S. and M.S. degrees in Electrical and Electronics Engineering
from the Eastern Mediterranean University, Famagusta, North Cyprus, in 1996 and 1998, respectively. He completed his PhD.
degree in Electrical and Electronic Engineering in Eastern Mediterranean University and joined Eastern Mediterranean University
as a lecturer in 2004. He is lecturing in the School of Computing and Technology. His main research interests include CDMA
communications, adaptive channel estimation, and multiuser detection techniques.
Hasan Amca was born in 1961 in Nicosia-Cyprus. He graduated from the Higher Technological Institute in Magosa-Cyprus (which is renamed
later as Eastern Mediterranean University). He joined EMU in 1985 after receiving a M.Sc. (Digital Signal Processing) degree
from the University of Essex in England (1985). He took his Ph.D. (Mobile Communications) from the University of Bradford
where he was on a Commonwealth scholarship. He has been teaching in the Electrical and Electronic Engineering Department of
Eastern Mediterranean University since 1993 where he also served as the vice chairman from Spring 1998 to Spring 2000. He
has been appointed as the Director of the School of Computing and Technology of the EMU since Spring 2000. His research interests
include Multi User Detection of CDMA signals, Adaptive Equalisation, Multi Carrier Systems, Mobile Radio Systems and Networks,
Internet and Information Technology Applications in Education.
Kadri Hacıoğlu was born in Nicosia, Cyprus. He received the B.Sc., M.Sc., and Ph.D. degrees in electrical and electronic engineering from
the Middle East Technical University, Ankara, Turkey, in 1980, 1984, and 1990, respectively. After his two-year military service,
in 1992, he joined the faculty of Eastern Mediterranean University, Magosa, North Cyprus, as an Assistant Professor, and became
an Associate Professor in 1997. While there, he taught several classes on electronics, digital communications, speech processing
and neural networks. During this time, he conducted research on applying fuzzy logic, neural networks, and genetic algorithms
to signal processing and communications problems. From 1998 to 2000, he was a Visiting Professor in the Department of Computer
Science, University of Colorado, Boulder. Here, he taught classes on neural networks and continued his research. Since 2000,
he has been a Research Associate at the Center for Spoken Language Research, University of Colorado. He has authored or coauthored
numerous papers and supervised a dozen M.Sc./Ph.D. theses. His current research interests are concept-based language modeling,
speech understanding, natural language generation, and search methods in speech recognition/understanding. He also does research
on multiuser detection and equalization in CDMA systems.
Ali Hakan Ulusoy was born in Eskişehir, Turkey, on June 3, 1974. He graduated from the double major program of the department of Electrical
and Electronic Engineering and department of Physics in Eastern Mediterranean University as the first rank student of Faculty
of Engineering in 1996. He received his M.S. degree in Electrical and Electronic Engineering in Eastern Mediterranean University
in 1998. He completed his PhD. degree in Electrical and Electronic Engineering in Eastern Mediterranean University and joined
Eastern Mediterranean University as a lecturer in 2004. He is lecturing in the School of Computing and Technology. His current
research interests include receiver design, multi-user detection techniques, blind and trained channel estimation in Code
Division Multiple Access (CDMA). 相似文献
95.
Ahmet Rizaner Hasan Amca Kadri Hacıoğlu Ali Hakan Ulusoy Ansgar Scherb 《Wireless Personal Communications》2007,42(4):537-542
Channel estimation techniques for CDMA system need to combat multiple access interference (MAI) to improve the estimation
performance. The linear MMSE detector has certain advantages with respect to the near–far problem and can be used to develop
a channel estimation algorithm. In this paper, an efficient iterative method for near–far resistant single-user mobile radio
channel estimation in slow fading multi-path direct sequence code division multiple access (DS-CDMA) channels is presented.
Computer simulation results demonstrate that a significant performance improvement can be achieved with the proposed method
especially under extreme near–far conditions. 相似文献
96.
The truncated functional expansion of a nonlinear system is representative of the system response when the rate of convergence is fast. This fact has been exploited to find an optimisation approach, subject to accuracy constraint, when the input is a step with probabilistic amplitude. 相似文献
97.
The fourth German pelviscopy/laparoscopy statistical report includes survey data on a total of 219,314 laparoscopies from 354 clinics and 40,892 laparoscopies from 161 private practices. Clinics' response rate was 44.7%, 98.9% of them reported performing laparoscopies; and the number of serious complications requiring laparotomy or control laparoscopy was 492 (2.2/1,000). For private practices, the comparable figures were 66%, 90.8% and 123 (3/1,000), respectively. Compared with data from the third laparoscopy statistical survey, the data show a slight increase in serious complications, most of which were mechanical lesions of blood vessels in the abdominal wall or in the mesosalpinx, followed by mechanical lesions of the intestine. As shown by the previous survey, 16.5% of the complications were burns. For tubal sterilization, bipolar techniques were still predominant; approximately equal numbers of departments used this method, with or without subsequent transsection of the tubes. Endocoagulation by the method of Semm was the second most popular procedure; the use of clips and rings was of little significance. Monopolar high-frequency (HF) current was still used with transsection by 4.1% of clinics (4.7% of private practices) and without transsection by 2.5% (5.3%). Sterilization failure rates remained the same as those previously reported (2.5/1,000 in clinics, 2.8/1,000 in private practices), the highest rates were observed after the use of monopolar HF techniques. Sixty-six percent of the clinics and 41% of the private practices reported their intention to increase the use of endoscopic operational methods. 相似文献
98.
Renaud Ferrier Mohamed L. Kadri Pierre Gosselet 《International journal for numerical methods in engineering》2018,116(4):270-286
This paper presents a study of primal and dual Steklov‐Poincaré approaches for the identification of unknown boundary conditions of elliptic problems. After giving elementary properties of the discretized operators, we investigate the numerical solution with Krylov solvers. Different preconditioning and acceleration strategies are evaluated. We show that costless filtering of the solution is possible by postprocessing Ritz elements. Assessments are provided on a 3D mechanical problem. 相似文献
99.
Ezgi Pinar Yalcintas Kadri Bugra Ozutemiz Toygun Cetinkaya Livio Dalloro Carmel Majidi O. Burak Ozdoganlar 《Advanced functional materials》2019,29(51)
This work describes a microcontact printing (µCP) process for reproducible manufacturing of liquid gallium alloy–based soft and stretchable electronics. One of the leading approaches to create soft and stretchable electronics involves embedding liquid metals (LM) into an elastomer matrix. Although the advantages of liquid metal–based electronics have been well established, their mainstream adoption and commercialization necessitates development of precise and scalable manufacturing methods. To address this need, a scalable µCP process is presented that uses surface‐functionalized, reusable rigid, or deformable stamps to transfer eutectic gallium–indium (EGaIn) patterns onto elastomer substrates. A novel approach is developed to create the surface‐functionalized stamps, enabling selective transfer of LM to desired locations on a substrate without residues or electrical shorts. To address the critical needs of precise and reproducible positioning, alignment, and stamping force application, a high‐precision automated µCP system is designed. After describing the approach, the precision of stamps is evaluated and EGaIn features (as small as 15 µm line width), as well as electrical functionality of printed circuits with and without deformation, are fabricated. The presented process addresses many of the limitations associated with the alternative fabrication processes, and thus provides an effective approach for scalable fabrication of LM‐based soft and stretchable microelectronics. 相似文献
100.
Abdurrazzaq Achmad Mohd Ismail Junoh Ahmad Kadri Yahya Zainab 《Multimedia Tools and Applications》2020,79(27-28):19659-19668
Multimedia Tools and Applications - The concept of the tropical algebra was first introduced to solve problems in mathematical economy such as optimization and approximation problems. In this... 相似文献