bluuebunny/crossref_metadata_2025_split huggingface dataset:
The conversion to radio‐frequency from optical signal by applying optical technology for optical and ubiquitous communications of the future
Authors: Park Ki‐Hwan 
Published: November 2008

AbstractA 95‐GHz continuous‐wave millimeter‐wave (MMW) was converted from optical signal by using optical technology for future optical and ubiquitous communications. The optical power of 22.5 mW was injected into optical waveguide in this experiment. The absolute power of the MMW signals measured after the MMW amplifier was about 13 dBm at 95 GHz. The spectral linewidth of the MMW signals was less than 1 kHz, and power fluctuation of the MMW was less than 1.3 dBm over the 75–95 GHz range. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 153–155, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23951
Modeling of shielded broadside‐coupled substrate striplines
Authors: Musa Sarhan M. , Sadiku Matthew N. O. 
Published: November 2008

AbstractBroadside‐coupled substrate striplines represent an essential part of modern integrated circuits. In this article, we will illustrate modeling of inhomogeneous quasi‐TEM shielded broadside‐coupled substrate striplines using the finite element method (FEM). FEM is especially suitable and effective for the computation of electromagnetic fields in strongly inhomogeneous media. We illustrate that FEM is suitable and effective as other methods for modeling shielded broadside‐coupled substrate striplines. We specifically determine the capacitance per unit length, even mode impedance, odd mode impedance, and characteristic impedance of shielded broadside‐coupled suspended striplines. Excellent agreement with some results obtained previously is demonstrated. We extended the modeling by designing our own model of shielded broadside‐coupled inverted microstrip line and determine the capacitance per unit length, even mode impedance, odd mode impedance, and characteristic impedance. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 9–13, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23960
A new silicon‐based photoconductive microwave switch
Authors: Flemish Joseph R. , Kwan Henry W. , Haupt Randy L. , Lanagan Michael 
Published: November 2008

AbstractA silicon‐based photoconductive microwave switch has been designed and fabricated within a coplanar waveguide on a high resistivity Si substrate. This device offers improved signal attenuation per incident optical power when compared with other types of optically controlled attenuators that have been reported. Attenuation of more than 30 dB was achieved by illumination from a single infrared LED. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 248–252, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23961
L‐band erbium doped fiber amplifier based on a large mode area fiber
Authors: Dragic Peter D. 
Published: November 2008

AbstractWe present a single‐pass L‐band erbium doped fiber amplifier (EDFA) based on a large mode area (LMA) fiber. A single transverse mode is maintained through restricted mode launch. Pump light near 974 nm is sent into the core and has high spatial overlap with the signal beam, helping to preserve single mode propagation. Up to +27 dB of pump power limited small signal gain (30 μW signal input) with a noise figure (NF) near 4.4 is achieved in a relatively short fiber[b]. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 173–175, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23966
Analysis of planar microwave circuits with lumped‐elements by CN‐FDTD
Authors: Tang Wanchun , Nai Yu , Yu Zhengyong 
Published: November 2008

AbstractA three‐dimensional implementation of the lumped‐element by Crank‐Nicolson finite‐difference time‐domain (CN‐FDTD) algorithm has been presented in this article. Several examples of planar microwave circuits with lumped resistor, capacitor, and/or inductor are simulated and compared with traditional finite‐difference time‐domain method and measurements. The accuracy of CN‐FDTD implementation for lumped elements in this article has been verified. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 113–116, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23969
UMTS radio over fiber link performance analysis based on low‐cost uncooled laser
Authors: Brizido A. , Lima M. , Teixeira A. , Larrode M. , Koonen T. 
Published: November 2008

AbstractThe performance of an UMTS radio over fiber link based on directly modulated lasers has been experimentally evaluated in terms of the error vector magnitude (EVM). Operational range for standard EVM values (<12%) was achieved in terms of distance and power. Also, the effect of a semiconductor optical amplifier on these signals in mono and multiwavelength was observed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 6–9, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23975
A self‐checking technique for materials characterization using calibration‐independent measurements of reflecting lines
Authors: Hasar U. C. 
Published: November 2008

AbstractThere is a need for a method for the performance evaluation of calibration‐independent measurements of dielectric materials located into a measurement cell (a coaxial or waveguide section) before starting the extraction of the complex permittivity of the sample. This is important since such a method can signal the accurateness of measurements and even may show any problem of numerical methods used for the permittivity extraction. In this article, we present a metric function derived for reflecting cells, in which the samples partially or completely fill. The function is validated by uncalibrated scattering parameter measurements. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 129–132, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23978
Compact harmonic control network for Doherty power amplifier
Authors: Colantonio Paolo , Giannini Franco , Giofrè Rocco , Piazzon Luca 
Published: November 2008

AbstractIn this contribution, an innovative design solution to realize small size Doherty power amplifier is presented. The idea consists in the realization of a unique output matching network for both carrier and peaking devices without losing the Doherty behavior. Experimental results performed on uneven Doherty amplifier using GaN HEMT device is given to demonstrate the proposed approach. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 256–258, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23983
Low profile DOA finder at 2.4 GHz
Authors: Uthansakul M. , Uthansakul P. , Sangmanee N. , Sangpradittara S. 
Published: November 2008

AbstractTechnique to find direction of arrival (DOA) has been promisingly constructed by smart antenna technology. It consists of array antennas and signal processing unit. Because of the limitation of space in commercial products, the size of antenna array should be designed with the smallest dimension. Also the processing unit is expected in low complexity and expense. Most of DOA finders were recently proposed employing linear array in which the size is linearly increased as a number of antenna elements. Also the processing units were fully comprised with high level of computation. In this paper, the low profile of 2.4 GHz DOA finder is proposed. The DOA finder is designed in the compact size of 2 × 2 array antennas. Using modified Butler matrix, the processing unit is very simple in which it can be handled by any economic microprocessors. The proposed finder is able to delicately specify DOA in every angle from 0° to 360°. The experimental results confirm the success of proposed DOA finder. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 252–256, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23984
A 24‐GHz 90‐nm CMOS injection‐locked frequency divider
Authors: Lee Chien‐Feng , Jang Sheng‐Lyang 
Published: November 2008

AbstractThis article presents a fully integrated 24‐GHz divide‐by‐2 injection‐locked frequency divider (ILFD). The circuit was implemented using a standard 90‐nm CMOS process. The ILFD consists of a VCO core and injection MOS for injection signal to the resonator. Two injection MOSFETs are in series with the cross‐coupled transistors. The measurement results show that at the supply voltage of 1.2 V, the free‐running ILFD is tunable from 11.4 to 12.11 GHz. The locking range is from 21.93 to 27.11 GHz. The output phase noise of the locked ILFD is −109.82 dBc/Hz at 10‐KHz offset frequency from the 12 GHz. The core power consumption is 4.32 mW at the supply voltage of 1.2 V. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 32–36, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23986
2.45 GHz inter‐/intraboard wireless communication using a CPW‐fed vertical bow‐tie antenna
Authors: Kim J. K. , Cha S. Y. , Yun T. S. , Yoon Y. K. 
Published: November 2008

AbstractCoplanar waveguide (CPW)‐fed vertically standing bow‐tie antennas for 2.45 GHz ISM band applications for inter‐/intraboard wireless communication are presented. The vertical antenna scheme provides wave propagation in the horizontal direction parallel to the substrate, allowing effective in‐plane board‐to‐board communication. The monopole bow‐tie antenna is implemented in an air‐lifted fashion, resulting in high efficiency, broad bandwidth, and small footprint compared with the conventional surface mounted patch type antenna. The vertical bow‐tie antenna with a height of 22.4 mm and a flare angle of 43° shows a 10‐dB bandwidth of 20.4%, a footprint of ∼1 mm2, and a height reduction of 33% compared with a cylindrical monopole counterpart. A numerical analysis has been performed between 1 and 4 GHz and the transmission characteristics using two identical antennas have been performed at 2.45 GHz with a network analyzer. The numerical results are in good agreement with experimental data. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 266–269, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23988
Bandwidth enhancement of K‐band CMOS mixer using balun matching for UWB radar
Authors: Yu Han‐Yeol , Choi Sung‐Sun , Kim Sung‐Hyun , Kim Yong‐Hoon 
Published: November 2008

AbstractA K‐band double balanced mixer with 1.9 GHz ultra‐wide bandwidth in a 0.18 μm CMOS technology is presented in this article. Baluns with slot pattern ground were applied to the proposed mixer for an ultra‐wide band matching in RF and LO ports. The mixer down converts RF signals (23.1–25 GHz) to intermediate frequency signals (100 MHz–1 GHz) using a LO signal of 24.1 GHz. The mixer achieves a conversion gain of 3.4 dB with a RF signal of 24 GHz and a LO signal of 24.1 GHz. A 1 dB compression point of the mixer is −4 dBm, and the mixer consumes 20 mA current with a 1.8 V supply. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 232–235, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23991
Miniaturized dual‐passband microstrip filter based on double‐split complementary split ring and split ring resonators
Authors: Genc Alper , Baktur Reyhan 
Published: November 2008

AbstractWe present a miniaturized dual‐passband filter module designed using double‐split complementary split ring resonator (DS‐CSRR) and split ring resonator (SRR). The use of SRR results in a significant size reduction of the filter comparing with edge‐coupled‐line filters. Two passbands are individually printed on two sides of a Rogers 3010 substrate, consequently providing a novel and compact integration. Coupling between two bands is weak, so they can be independently designed and tuned. Both bands operate at fundamental mode, providing an increased stability. A prototype dual‐band filter basic cell is fabricated and the measurement agrees well with simulations by Agilent's momentum. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 136–139, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23996
Miniaturization of wideband branch‐line couplers using fractal‐shaped geometry
Authors: Chen Wen‐Ling , Wang Guang‐Ming , Zhang Chen‐Xin 
Published: November 2008

AbstractIn this article, we present a technique to miniaturize the cascaded wideband branch‐line couplers using fractal‐shaped geometry. As an example, four‐branch couplers operated at 2.0 GHz employing Koch fractal shapes of different iteration orders have been designed successfully. By meandering the branch lines in accordance with the structures of the Koch curves, the fractal‐shaped couplers of first and second iteration orders achieved 50.4% and 72.7% size reduction, respectively, with no major effect to overall performances. The technique was verified by the measurement results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 26–29, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24002
Accurate design of a compact superconducting microstrip filter
Authors: Peng Huili , Guo Xubo , Jin Shichao , Piao Yunlong , Zhang Xiaoping , Wei Bin , Gao Baoxin , Cao Bisong 
Published: November 2008

AbstractThis article presents a six‐pole high‐temperature superconducting (HTS) filter at 2.5 GHz with a compact size of 10 mm × 15 mm on MgO substrate. Twin‐spiral resonators with high simulation accuracy are used in the design procedure. EM simulations verify that the filter response is insensitive to the variations of the cell sizes and the substrate parameters. The untuned measurement of the HTS filter at 70 K shows a high performance. The minimum return loss is 14.7 dB without any tuning. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 141–144, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24018
A probe‐fed patch antenna with a step‐shaped ground plane for 2.4 GHz access point
Authors: Chang Fa‐Shian , Liu Yung‐Tao , Su Saou‐Wen , Chou Jui‐Hung 
Published: November 2008

AbstractThis letter demonstrates a new design of a probe‐fed patch antenna with a modified antenna ground, and a constructed prototype ideal for applications in a 2.4‐GHz WLAN access point is presented. The antenna has a thick air substrate for broadband operation and is fed by an inclined probe pin at the edge of the patch bent portion. The antenna ground comprises different portions and is in the shape of a step. With the proposed probe feed and ground configuration, good impedance bandwidth with VSWR below 1.5 over the 2.4 GHz WLAN band can be obtained. In addition, good broadside radiation characteristics have also been observed. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 139–141, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24019
Application of asymptotic waveform evaluation technique in the on‐surface discretized boundary equation method
Authors: Wang Kan , Xu Yun‐Sheng 
Published: November 2008

AbstractThe recently developed on‐surface discretized boundary equation (OS‐DBE) method for scattering by a conducting cylinder allows an independent determination of the current density at any given point on the object surface with a matrix of smaller order than that in the method of moments. However, the generation of the whole current distribution requires repeated calculations at many points. To improve the numerical efficiency, this article incorporates the asymptotic waveform evaluation technique into the OS‐DBE method to reduce the number of current calculation points at which the utilization of the OS‐DBE is necessary. Numerical results are presented to demonstrate the validity and efficiency of the proposed technique. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 67–70, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24022
Degeneration of dementia with Lewy bodies measured by diffusion tensor imaging
Authors: Ota Miho , Sato Noriko , Ogawa Masafumi , Murata Miho , Kuno Sadako , Kida Jiro , Asada Takashi 
Published: November 2008

AbstractDementia with Lewy bodies (DLB) is the second most common form of dementia. It is thought to involve impairment of the visual association area. In this study, we applied diffusion tensor imaging (DTI) to examine the microstructural interruption of visual association areas in patients with DLB. The DTI metrics of three visual association fibres – the inferior longitudinal fasciculus (ILF), visual pathway, and splenial fibres – were compared between 14 patients with DLB and 13 healthy subjects. The fractional anisotropy value of the ILF was significantly lower in patients with DLB than in healthy subjects. The difference in the mean diffusivity value of ILF was at trend level. The λ2,3 of ILF were significantly lower in patients with DLB; however, there was no difference in λ1. DTI metrics of the visual pathway and splenial fibres showed no differences between the groups. Our results showed degeneration of the ILF, which is responsible for visuospatial cognition. ILF dysfunction may influence the clinical features in DLB. Copyright © 2008 John Wiley & Sons, Ltd.
Real‐time scheduling of multiple uncertain receding horizon control systems
Authors: Gholami Behnood , Gordon Brandon W. , Rabbath C. A. 
Published: November 2008

AbstractIn this paper, a new scheduling approach is proposed that considers the effect of modeling uncertainty for multiple continuous time receding horizon control (RHC) systems. This is accomplished by combining a scheduling approach with results from the continuous time nonlinear systems theory. It is shown that using a rate monotonic priority assignment method combined with analytical bounds on the prediction error, the problem of scheduling multiple uncertain plants can be cast into an appropriate constrained optimization problem. The constraints guarantee that the processes will be schedulable. The optimization provides optimized performance and balanced resource allocation in the presence of uncertainty. The proposed method was applied to a real‐time simulation of RHC trajectory tracking for two hovercraft vehicles demonstrating the validity of the approach. Copyright © 2008 John Wiley & Sons, Ltd.
Attributes of adult stem cells
Authors: Alison MR , Islam S 
Published: November 2008

AbstractWhile cultured embryonic stem (ES) cells can be harvested in abundance and appear to be the most versatile of cells for regenerative medicine, adult stem cells also hold promise, but the identity and subsequent isolation of these comparatively rare cells remains problematic in most tissues, perhaps with the notable exception of the bone marrow. The ability to continuously self‐renew and produce the differentiated progeny of the tissue of their location are their defining properties. Identifying surface molecules (markers) that would aid in stem cell isolation is a major goal. Considerable overlap exists between different putative organ‐specific stem cells in their repertoire of gene expression, often related to self‐renewal, cell survival and cell adhesion. More robust tests of ‘stemness’ are now being employed, using lineage‐specific genetic marking and tracking to show production of long‐lived clones and multipotentiality in vivo. Moreover, the characterization of normal stem cells in specific tissues may provide a dividend for the treatment of cancer. The successful treatment of neoplastic disease may well require the specific targeting of neoplastic stem cells, cells that may well have many of the characteristics of their normal counterparts. Copyright © 2008 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
Acquired von Willebrand syndrome and Wilms tumor: Not always benign
Authors: Baxter Patricia A. , Nuchtern Jed G. , Guillerman Robert P. , Mahoney Donald H. , Teruya Jun , Chintagumpala Murali , Yee Donald L. 
Published: November 2008

AbstractCurrent literature suggests that acquired von Willebrand syndrome associated with Wilms tumor (AVWS‐WT) occurs infrequently and usually has little clinical significance. Treatment strategies are thus poorly defined. We describe two patients with AVWS‐WT and profuse bleeding who required intensive multimodal therapy, including aggressive blood component and factor replacement and plasmapheresis. They achieved adequate surgical hemostasis only after the renal vessels were ligated, with resolution of the coagulopathy upon tumor removal. Our experience suggests that AVWS‐WT is not always benign. A careful bleeding history should always be obtained in patients with suspected renal tumors for consideration of pre‐operative screening for AVWS. Pediatr Blood Cancer 2009;52:392–394. © 2008 Wiley‐Liss, Inc.
Both location and age predict survival in ependymoma: A SEER study
Authors: McGuire Courtney S. , Sainani Kristin L. , Fisher Paul Graham 
Published: November 2008

AbstractBackgroundStudies have suggested that supratentorial ependymomas have better survival than infratentorial tumors, with spinal tumors having the best prognosis, but these data have been based on small samples. Using a population‐based registry of ependymomas, we analyzed how age, gender, location, race and radiotherapy influence survival in children.MethodsWe queried the Surveillance Epidemiology End Results database (SEER‐17) from 1973 to 2003, strictly defining ependymomas by histology. Site codes were used to distinguish between supratentorial, infratentorial, and spinal tumors when available. Outcomes were compared by location, age, gender, race and radiotherapy, using Kaplan–Meier analysis and logrank tests. Cox regression was completed, incorporating all significant covariates from univariate analysis.ResultsSix hundred thirty‐five children were identified with an overall 5‐year survival of 57.1 ± standard error (SE) 2.3%. Increasing age was associated with improved survival (P < 0.0001). Five‐year survival by location was 59.5 ± SE 5.5% supratentorial, 57.1 ± SE 4.1% infratentorial and 86.7 ± SE 5.2% spinal. Radiotherapy of the infratentorial tumors resulted in significantly improved survival in both univariate analysis (logrank P < 0.018) and multivariate analysis restricted to this tumor location (P = 0.033). Using multivariate analysis that incorporated all tumor locations, age (P < 0.001) and location (P = 0.020) were significant predictors for survival.ConclusionsAge and location independently influence survival in ependymoma. Spinal tumors are associated with a significantly better prognosis than both supratentorial and infratentorial tumors, and may represent a distinct biological entity. Radiotherapy appears beneficial for survival in patients with infratentorial ependymoma. Pediatr Blood Cancer 2009;52:65–69. © 2008 Wiley‐Liss, Inc.