IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
Volume 9 , Issue 7
Showing 1-19 articles out of 19 articles from the selected issue
LETTER
  • Farshad Tajeripour, Mahmood Sotoodeh
    2012 Volume 9 Issue 7 Pages 609-615
    Published: April 01, 2012
    Released: April 01, 2012
    JOURNALS FREE ACCESS
    The first phase in optical music recognition (OMR) is staff-removal. The goal of this phase is to remove staffs and keep musical symbols with high precision, which is very important for next phases in OMR including segmentation and classification. In this paper a novel staff-removal method is proposed. In this method we used run-length coding to compress the input image and then the staff-lines are detected and removed using two common features, namely the thickness of lines and the space between them. Afterwards, The nonstaff objects such as long objects, dynamic wage and destroyed texts are removed using projection and morphological operations.
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  • Takashi Ohira
    2012 Volume 9 Issue 7 Pages 616-621
    Published: April 04, 2012
    Released: April 04, 2012
    JOURNALS FREE ACCESS
    This paper derives two kinds of Q factor formulas for use in estimating frequency stability of sinusoidal oscillators. To cover various circuit topologies, we consider a general black-box model having DC input and RF output ports. Assuming a small deviation in DC supply voltage or RF load impedance, the frequency shift caused by such deviation is formulated by a perturbation technique. As a versatile criterion to indicate the tolerance of circuit itself, we introduce oscillator Q against each deviation. Since the theory is described in the linear impedance domain, it gives oscillator designers a clear vista on the stability of practical circuits.
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  • Yeong Guk Oh, Keun Jae Park, Hyuek Jae Lee, Chang Hee Lee
    2012 Volume 9 Issue 7 Pages 622-628
    Published: April 04, 2012
    Released: April 04, 2012
    JOURNALS FREE ACCESS
    A broadcast/multicast transmission method in a WDM-PON system using a low-cost Fabry-Pérot laser diode with broadband ASE injection is proposed and experimentally demonstrated in this paper. Because of its low front-facet reflectivity (∼0.1%), the F-P LD exhibits a broadband lasing spectrum and reduced mode-partition noise. To demonstrate its performance, the bit error rate and packet loss rate were measured. The proposed optical source provides a cost-effective WDM-PON architecture for a broadcast/multicast service accommodating more than 32×622MBps. For the transmission of MPEG-2 TS packets, zero packet loss could be obtained at an optical power of -32dBm.
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  • Yingsong Li, Wenxing Li, Qiubo Ye
    2012 Volume 9 Issue 7 Pages 629-635
    Published: April 04, 2012
    Released: April 04, 2012
    JOURNALS FREE ACCESS
    A kind of reconfigurable wide slot UWB antenna integrated with stepped impedance resonators (SIRs) and ideal switches is presented. The proposed antenna 1 has dual notch band functions which are obtained by using two stepped impedance stub loaded SIRs. The three reconfigurable models are investigated and discussed. The measurement results with ideals switches demonstrate the performances of proposed reconfigurable antennas. The designed reconfigurable antennas can be suitable for future multi-mode wireless communications systems.
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  • Leonid Belostotski
    2012 Volume 9 Issue 7 Pages 636-641
    Published: April 04, 2012
    Released: April 04, 2012
    JOURNALS FREE ACCESS
    In this work two 0.7-1.4GHz room-temperature 65nm CMOS low noise amplifiers (LNAs), designed for the Square Kilometre Array (SKA) radio telescope receiver, are compared. One LNA was fabricated with low-power (LP) transistors whereas the other, otherwise identical LNA, was fabricated with general-purpose (GP) transistors. As shown there are electrical and noise performance differences between the two circuits. The GP-LNA achieves better noise temperatures (∼22K) at the upper band edge whereas the LP-LNA has a higher gain. The GP-LNA is a marginally better option for the SKA due to better S11 and lower noise temperatures at the upper frequency range.
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  • Asghar Taheri
    2012 Volume 9 Issue 7 Pages 642-647
    Published: April 04, 2012
    Released: April 04, 2012
    JOURNALS FREE ACCESS
    This paper deals with using Extended Kalman Filter (EKF) as a powerful tool in estimate of parameters and states of six-phase induction motor (6PIM). The speed-sensorless field-oriented control of 6PIM supplying by SVPWM is used to estimate of parameters in parameter variations. The EKF algorithm estimate stator flux, stator current, and stator resistance by measurement of stator currents of inverter. The estimation algorithms based on the stator fluxes is tested under load variations in the high velocity. The simulation results presented in this paper explain the performance of proposed method in the six-phase induction machine drive.
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  • Jesus E. Molinar-Solis, Rodolfo García-Lozano, Alejandra Morale ...
    2012 Volume 9 Issue 7 Pages 648-653
    Published: April 06, 2012
    Released: April 06, 2012
    JOURNALS FREE ACCESS
    An additional stage for a Low Voltage Lazzaro's Winner Take All (WTA) circuit is introduced. It allows lowering the voltage supply requirements so that it can be functional in fine line CMOS technology. Electrical measurements of a prototype in CMOS 0.5µm technology verify the operation of the WTA circuit with VDD=1.5V. Simulations in PSpice and stability issues are presented as well.
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  • Ic-Pyo Hong, In-Gon Lee
    2012 Volume 9 Issue 7 Pages 654-659
    Published: April 06, 2012
    Released: April 06, 2012
    JOURNALS FREE ACCESS
    This study designs a film monopole antenna for WiBro (wireless broadband internet, 2.3-2.4GHz) and WLAN (wireless local area network, 2.4-2.48GHz) bands. A variety of design parameters were used to optimize frequency properties, and radiating and grounding elements were placed on the same plane for maximized radiation efficiency. Cloverleaf-shaped radiating elements were used to induce a phase difference of 180 degrees and thus obtain improved bandwidth. This paper presents the possibility of realizing broadband by using parasitic elements. The antenna created in this study achieves a peak gain of up to 3.18dBi and satisfies WiBro (2.3-2.4GHz) and WLAN (2.4-2.48GHz) bands with a bandwidth of 2.30-2.54GHz (9.8%) at -10dB or lower.
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  • Yusuke Omote, Takenori Yasuzumi, Tomoki Uwano, Osamu Hashimoto
    2012 Volume 9 Issue 7 Pages 660-665
    Published: April 06, 2012
    Released: April 06, 2012
    JOURNALS FREE ACCESS
    This paper presents an ultra-wideband bandpass filter (UWB BPF) using quarter-wavelength inverter-lines at both sides of a three-pole interdigital filter. The relations between the impedances of the inverter-line with the load and those of the interdigital filter connected to the inverter-line were studied. From these, the design procedures for the impedance matching at the UWB passband edges were shown. Then the designed BPF from the above results showed that the bandwidth was 24% wider than that of the sole interdigital filter by additional two conjugate matching poles. The fabricated BPF achieved the performances of the required passband by the five matching poles.
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  • Ifong Wu, Hiroki Ohta, Kaoru Gotoh, Shinobu Ishigami, Yasushi Matsumot ...
    2012 Volume 9 Issue 7 Pages 666-672
    Published: April 06, 2012
    Released: April 06, 2012
    JOURNALS FREE ACCESS
    A relation between electromagnetic noise from an LED light bulb and its impact on BER performance of the DTTB is estimated from the APD measurement. First, the APD of the noise is measured with various resolution bandwidths. The characteristic of the APD of the noise is similar to the Gaussian noise when the resolution bandwidth becomes narrow. Then, the BER performance of the DTTB subjected to the noise of the LED light bulb is estimated from the APD result with the resolution bandwidth that is nearly equal to the subcarrier band range of the DTTB. As a result, the BER of the estimated result agrees well with measured results which are subjected to the LED light bulb and the Gaussian noise. Therefore, the effect of the noise from the LED light bulb on the DTTB is similar to the effect of the Gaussian noise.
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  • Ryoichi Sato, Hiroshi Sato, Hiroshi Shirai
    2012 Volume 9 Issue 7 Pages 673-678
    Published: April 06, 2012
    Released: April 06, 2012
    JOURNALS FREE ACCESS
    This letter proposes new usage of the binary tree constructed by fundamental GO ray components in shooting and bouncing rays (SBR) for indoor propagation analysis. The node number of the binary tree is here considered as an important parameter. A couple of small size arrays that can store the passing ray information of both the node number and the position of the pixel considered, and the corresponding ray classification algorithm are newly introduced, not to double-count the same ray with slightly different bouncing angle. Consequently, we realize the big reduction of the computer memory resources consumed for the ray classification especially for wide area analysis, keeping the high accuracy of the SBR method.
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  • Mohammad Lari, Abbas Mohammadi, Abdolali Abdipour, Inkyu Lee
    2012 Volume 9 Issue 7 Pages 679-684
    Published: April 11, 2012
    Released: April 11, 2012
    JOURNALS FREE ACCESS
    In this paper, effective capacity in amplify-and-forward (AF) relaying system is studied. For this purpose, a closed-form solution for the effective capacity of AF relays with a near optimal power allocation is extracted.
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  • Mehdi Golsorkhtabaramiri, Mehdi Hosseinzadeh, Ali Golsorkhtabaramiri, ...
    2012 Volume 9 Issue 7 Pages 685-690
    Published: April 11, 2012
    Released: April 11, 2012
    JOURNALS FREE ACCESS
    Wireless Sensor Networks (WSNs) for reducing energy consumption and increasing sensors lifetime can use the clustering algorithms. We propose a new energy-efficient hierarchical clustering algorithm based on soft threshold cluster-head election and cluster member bounds for WSNs which called HCABS. Our simulation studies suggest that HCABS achieves longer lifespan and reduce energy consumption in WSNs as well as low latency and moderate overhead across the network.
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  • Jinyoung Yang, Daeyoung Kim
    2012 Volume 9 Issue 7 Pages 691-697
    Published: April 11, 2012
    Released: April 11, 2012
    JOURNALS FREE ACCESS
    Precise time synchronization is inevitable for duty-cycling and TDMA in wireless sensor networks. To achieve a precise synchronized clock between nodes, fast distribution of time information of a reference node to all other nodes in multi-hop without a scheduling is necessary. In this letter, we propose a time synchronization algorithm, RFTS (Ripple Flooding Time Synchronization), that presents the fastest distribution of time information of a reference node by using synchronized packet broadcasting instead of CSMA-CA based broadcasting. We show that error in any hops is not affected by a prior hop node in the evaluation, average error and distribution time of RFTS outperforms widely used FTSP by a factor of 2.5 and 2 respectively.
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  • Ryosuke Ozaki, Tsuneki Yamasaki
    2012 Volume 9 Issue 7 Pages 698-705
    Published: April 11, 2012
    Released: April 11, 2012
    JOURNALS FREE ACCESS
    In this paper, we analyzed the guiding problem for dielectric waveguide introduced as defect layers composed of dielectric circular cylinders with rhombic dielectric structure along a middle layer, and investigate the distribution of energy flow of dielectric waveguides for both TM0 and TE0 modes by using the propagation constants at the guided area. From numerical results, we can be obtained the confinement efficiency by loaded with rhombic dielectric structure compared with dielectric triangular cylinders for TM0 mode. In the case of TE0 mode, it is shown obviously that we can be obtained the confinement efficiency loaded with dielectric circular cylinders compared with rhombic dielectric structure.
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  • Xiaoshan Yu, Huaxi Gu, Yingtang Yang, Luying Bai, Hua You
    2012 Volume 9 Issue 7 Pages 706-711
    Published: April 11, 2012
    Released: April 11, 2012
    JOURNALS FREE ACCESS
    2D-mesh is widely used in Network-on-Chip as its regular topology and simple layout match the two-dimensional VLSI layout well. Further more, the optical circuit switching (OCS) is introduced to provide higher bandwidth and lower power consumption. However, the undesirable property of OCS is the coarse granularity of resource reservation. It leads to a high blocking ratio and degrades the performance. This paper proposes a multi-wavelength communication strategy and an optical router to solve this problem. The simulation results show that the strategy improves the performance in terms of end-to-end delay and throughput.
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  • Hideaki Asakura, Keiichi Nashimoto, David Kudzuma, Masahiko Hashimoto, ...
    2012 Volume 9 Issue 7 Pages 712-717
    Published: April 12, 2012
    Released: April 12, 2012
    JOURNALS FREE ACCESS
    A wavelength selective AWG (arrayed-waveguide grating) was fabricated using buried PLZT ((Pb, La)(Zr, Ti)O3) waveguides. It has 8 output channels with 200GHz spacing. The buried PLZT waveguides have lower propagation loss and higher optical confinement compared to the previously reported ridge PLZT waveguides. Therefore, using buried PLZT waveguides, an AWG with shorter channel spacing than a conventional AWG can be designed and fabricated. The 3-dB bandwidth was 110GHz, the maximum control voltage was 14V, and the tuning range was 1600GHz. Wavelength tuning was successfully demonstrated with a crosstalk of about -14dB for TE (transverse electric) polarized light and -13dB for TM (transverse magnetic) polarized light.
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  • Yun Liu, Yongjiu Zhao, Mengmeng Cui, Hongfu Meng
    2012 Volume 9 Issue 7 Pages 718-723
    Published: April 12, 2012
    Released: April 12, 2012
    JOURNALS FREE ACCESS
    This letter presents a novel microstrip tri-band filter in which a shunt-stub bandpass filter and a dual-band bandstop filter are integrated into a single structure of short length. The two stopbands of the bandstop filter are allocated within the wideband passband of the bandpass filter, resulting in a filter having three passbands. Good return loss is obtained using an optimization routine. This technique has high flexibility on setting the bandwidths and center frequencies of passbands. A prototype filter is designed and fabricated. Good agreements between simulation and measurement in respect of low insertion loss and high isolation are demonstrated.
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  • Lun Li, Xiongbin Wu, Xing'an Xu, Bin Liu, Chao Long, Zhiben Shen, Xiao ...
    2012 Volume 9 Issue 7 Pages 724-730
    Published: April 13, 2012
    Released: April 13, 2012
    JOURNALS FREE ACCESS
    The formula of inversion ocean gravity wave phase velocity from high frequency surface wave radar (HFSWR) sea echo is derived. By field data analysis at deep water condition, the ocean gravity wave phase velocity is verified by comparison with theoretical velocity based on deep water dispersion relationship.
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