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Article type: Cover
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Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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Article type: Index
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Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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Satoshi FUJIMOTO, Zhencheng HU, Thomas Feraud
Article type: Article
Session ID: BCT2013-1
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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Indoor electric cart STAVi had been developed to reduce the burden of the moving for elderly people in the progress of the aging population. The STAVi has free caster as real wheel. So, it is difficult to control by itself. In this study, we are using SLAM, Localization and Mapping at same time, to control the moving of the STAVi. There are two types of User Assist Control and Autonomous Moving Control. In addition, we construct Collision Avoidance System with danger map.
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Shotaro Saruwatari, Zhencheng Hu, Thomas Feraud
Article type: Article
Session ID: BCT2013-2
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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SLAM is method of measuring vehicle's position and making obstacle map. It used for robotic and Autonomous travel. Formerly, SLAM was based on vehicle speed sensor or gyro sensor but they can't cope idle or slip. So Visal SLAM based on image process has lately attention. This paper suggest Visual SLAM using connect cameras. It has wider visiblity than single camera and higher resolution than omni camera.
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Naoko Uchida, Zhencheng HU, Hitoshi Yoshitomi, Yanchao Dong
Article type: Article
Session ID: BCT2013-3
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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The traffic accident occurs due to aimless driving such as the driver's looking aside, fatigue, and a nap. In this research, we aim at development a system that can judge the aimless driving by driver's facial feature point. Usually RGB images are used for facial feature point's detection. But they are influenced by environment light, so in the car with a large change of environment light, the detection of the stable facial feature point is difficult. In this paper, we use depth information that is not influenced by changing light for facial and nose region detection.
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Qi ZHAO, Taikei SUYAMA, Akira MATSUSHIMA, Yoichi OKUNO
Article type: Article
Session ID: BCT2013-4
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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We present an idea of grating-based plasmon biosensor utilizing phase detection to realize high resolution in finding a refractive index of a material put on the surface of a metal grating. Assuming the resolution in phase detection to be 2.5×10^<-2> degrees, we estimate the resolution of the biosensor as 7.5×10^<-7> refractive index units. We also discuss the possible improvement to realize a predicted superior limit of resolution around 10^<-8>.
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Keisuke Shigetomi, Kazunori Uchida
Article type: Article
Session ID: BCT2013-5
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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This paper is concerned with a numerical simulation of electric field distributions by using 1-ray and 2-ray models. First, based on the 1-ray and 2-ray models, we introduce the amplitude modification factor α and the propagation order of distance β to deal with propagation problems in complicated urban areas. Next, we show that the two parameters α and β can be determined by comparing the proposed model with Hata's empirical equations. Finally, by applying building coverage and floor space index, we propose a new method for estimating electric field distributions in complicated propagation environments in addition to those areas defined by Hata's equations.
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Jun-Hyuck Lee, Kazunori Uchida
Article type: Article
Session ID: BCT2013-6
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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In this paper, we propose an algorithm for allocation of sensor nodes and base stations in inhomogeneous propagation environments. First, we review 1-ray and 2-ray models with amplitude modification factor α and propagation order of distance β. Second, we introduce an equation to compute communication distance. Third, we propose a communication distance function to allocate base stations optimally based on PSO. In numerical examples, we show an adaptive algorithm for generating inhomogeneous triangular cells to achieve optimal allocations of base stations.
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Ryo NAGAO, Jiro IWASHIGE, Motohiko IWAIDA, Yuki ISAYAMA, Saki KAMEYAMA
Article type: Article
Session ID: BCT2013-7
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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It is important to estimate the wave propagation paths in the urban areas from the viewpoint of effective utilization of radio resources. In urban areas, walls and edges of buildings and other structures affect radio propagation. In this paper, we consider electromagnetic waves diffracted by two horizontal edges of different heights with arbitrary angles.
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Motohiko IWAIDA, Jiro IWASHIGE, Ryo NAGAO, Yuki ISAYAMA, Saki KAMEYAMA
Article type: Article
Session ID: BCT2013-8
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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In urban areas, electromagnetic waves are scattered by walls and edges of buildings and other structures, and affect communication quality. It is important to analyze the waves diffracted by such buildings. So, we have analyzed diffracted fields by two different height edges with arbitrary angle. But, we can't determine diffraction points analytically for such a model. Therefore, we propose the method which can find diffraction points by repeated operation, and show numerical examples.
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Yuki ISAYAMA, Jiro IWASHIGE, Saki KAMEYAMA, Ryo NAGAO, Motohiko IWAIDA
Article type: Article
Session ID: BCT2013-9
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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Recently, many wireless communication devices such as mobile phones are used. However, in urban area, electromagnetic waves are scattered by buildings and other structures, so the propagation path is complicated. In this paper, we discuss the diffracted fields how they are affected by shapes and material of the wedges.
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Saki KAMEYAMA, Jiro IWASHIGE, Yuki ISAYAMA, Ryo NAGAO, Motohiko IWAIDA
Article type: Article
Session ID: BCT2013-10
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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In urban areas, radio waves are scattered by buildings and other things, so the communication environment that commnication quality deteriorates. It is important to analyze how the waves are affected by such structures. The authors have shown that the shape and material of the wedge do not affect the diffracted fields. In this paper, we consider reflected waves and diffracted waves by a wedge that is constructed by perfect conductor and concrete with rough surface.
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Kazufumi INOMATA, Toshiaki MATSUNAGA, Mayumi MATSUNAGA, Kazunori UCHID ...
Article type: Article
Session ID: BCT2013-11
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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Wireless communication systems such as mobile phones and wireless LAN are affected by walls and windows when those systems are used inside/around buildings. For making clear the fact, electric field distribution inside/around the model of a square building are measured and analyzed by FVTD simulations taking into account the difference of windowpanes' structures. In this paper, to know the effect of the windows' thickness, electric field distribution around the building model with double-layered windows is compared with that with single-layered windows. Those results show that the electric field strength is made higher and is attenuated more by the double-layered windows compared with single layered windows inside and outside the building, respectively. Therefore, it has been shown that the EM propagation around double layered windows is different from that around single layered windows.
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Ryuji TATSUMI, Mayumi MATSUNAGA, Toshiaki MATSUNAGA
Article type: Article
Session ID: BCT2013-12
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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Electromagnetic (EM) waves propagating around buildings have been studied by measurement and numerical simulations taking into account building's structures as one of the researches concerning to finding ways to improve EM environment inside tunnels and undergrounds. In this paper, the effect of the periodic round convexities being put on concrete walls on reflection waves has been studied by the two dimensional EM wave propagation analysis using the CIP (Constrained Interpolation Profile Scheme) method. The numerical results obtained by these simulations show that the reflection waves from the wall having round convexities become higher than that from the flat wall in some cases. It means that electric field strength reflected from the wall having periodic round convexities has a frequency characteristic depending on periodic intervals of round convexities. As a practical use of round convexities, the electric field distribution inside the L shape tunnel is compared between the case that round convexities are put on a wall and the case that all walls are flat.
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Ryuichi NAKASHIMA, Eisuke NISHIYAMA, Ichihiko TOYODA
Article type: Article
Session ID: BCT2013-13
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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In this paper, a multi-polarization rectenna integrating four dual-polarized antennas is proposed for wireless power transmission and energy harvesting. The proposed rectenna divides a received RF signal having any linear polarization into two orthogonal components and converts each component to DC. The feasibility of the proposed multi-polarization rectenna is experimentally confirmed and its basic characteristics are evaluated.
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Hiroki Otomaru, Eisuke Nishiyama, Ichihiko Toyoda
Article type: Article
Session ID: BCT2013-14
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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In this paper, optimizations of the differential mode rectenna unit that we have proposed are discussed. As the rectenna unit is device that integrates the antenna elements with the rectifier circuit and operates as differential mode, high conversion efficiency can be obtained with very simple structure. This paper focuses on a characteristic impedance of line of the rectifying circuits. The optimization of the characteristic impedance is investigated experimentally.
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Mitsuo TAGUCHI, Takuro HIRATA
Article type: Article
Session ID: BCT2013-15
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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The wireless power transmission system composed of the unbalanced fed, ultra low profile inverted L antenna on a rectangular conducting plane is numerically analyzed. When the structure of reception antenna is different from the transmitting antenna, the input impedances of two antennas and the power transmission efficiency are investigated. The design frequency is 1 GHz.
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Mitsuo TAGUCHI, Ippei MINE
Article type: Article
Session ID: BCT2013-16
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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The wireless power transmission system composed of the unbalanced fed, ultra low profile inverted L antenna on a rectangular conducting plane is numerically analyzed. In order to the deterioration of the power transmission efficiency due to the displacement between the transmitting reception antennas, two reception antennas are used. The size of conducting plane is 129 mm by 46 mm. In the case of the distance between transmitting and reception antennas is 14 mm, the power transfer efficiency more than 80 % is obtained in the displacement up to 98 mm at the design frequency of 1 GHz.
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Mitsuo TAGUCHI, Hiroyuki KAWASAKI
Article type: Article
Session ID: BCT2013-17
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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In order to estimate the position of a catheter at pharynx, the transmitting characteristics between two ultra low profile inverted L antennas are studied. By changing the position of transmitting antenna, the S21 characteristics of reception antenna is calculated.
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Mitsuo TAGUCHI, TAKUMI Kida
Article type: Article
Session ID: BCT2013-18
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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The transmitting antenna composed of the unbalanced fed ultra low profile inverted L antenna on the rectangular conducting plane is proposed for the outside broadcasting. Around the inverted L antenna, 8 parasitic elements are located as the reflector elements. When the antenna size is 375 mm by 180 mm by 255 mm, the return loss less than -10dB is satisfied at the frequencies from 770 MHz to 806 MHz. The directivity becomes about 10 dBi. In the numerical analysis, the electromagnetic simulator "WIPL-D" based on the method of moment is used.
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Mitsuo TAGUCHI, Naoto HIGASHI
Article type: Article
Session ID: BCT2013-19
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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When the Gaussian monocycle pulse voltage source is excited at the feed point of square loop antenna, the time domain response of electromagnetic field distribution is calculated by using the electromagnetic simulator. Moreover, the time domain response of electromagnetic field around the loop antenna is visualized. In the numerical analysis, the electromagnetic simulator WIPL-D based on the Method of Moment is used.
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Satoru SAWADA, Hayato FUJINUMA
Article type: Article
Session ID: BCT2013-20
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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For the London Olympics, the British Broadcasting Corporation (BBC) and Nippon Hoso Kyokai (NHK) held SUPER Hi-VISION (SHV) public viewings (hereinafter PV) at venues in Japan, the UK, and the USA, in cooperation with the Olympic Broadcasting Service (OBS).
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Sotaro MARUYAMA, Takeshi FUKUSAKO
Article type: Article
Session ID: BCT2013-21
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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A bandwidth enhancement technique for microstrip antennas using coaxial structure is presented. The proposed method is to extend the outer conductor and the inside the dielectric substrate of a SMA connector, and a flange is mounted on the top of the extended outer conductor. The bandwidth is improved by applying this method. The proposed antenna has successfully achieved a simulated S11 bandwidth of 37%. This method can be applied for broadband designs of circularly polarized microstrip antenna using AG structure.
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Masahiko ISHII, Takeshi FUKUSAKO
Article type: Article
Session ID: BCT2013-22
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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This study presents a radiation efficiency enhancement on circularly polarized leaky wave antenna (CP LWA) using composite right/left handed transmission line (CRLH-TL). In my previous research, the CP LWA was achieved because of the better phase difference and amplitude ratio. The 90° -phase difference can be obtained by optimizing the dimension of the unit cell. And the amplitude ratio of |E_x| and |E_y| for CP was obtained by selecting a suitable position of the CRLH-TL between both edges of the ground. In this study, the radiation efficiency is enhanced by increasing the number of the unit cell, maintaining the circular polarization characteristics by applying the same method as previous research. As a result, the radiation efficiency of 52% is obtained on the operation frequency band which is from 2.68 to 2.9 GHz by the experiment.
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Akinori TANAKA, Takafumi FUJIMOTO
Article type: Article
Session ID: BCT2013-23
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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A triple band circularly polarized small square microstrip antenna with two pairs of crank shaped slits at each edge is proposed. The antenna is fed by an L-probe coaxial feed. By parametric studies using simulator, the design procedure for tuning the axial ratio and the frequencies giving the minimum axial ratio at the triple band is obtained. Moreover, the proposed antenna is designed using the design procedure for GPS (L1, L2, and L5 bands).
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Daisuke TANAKA, Takafumi FUJIMOTO
Article type: Article
Session ID: BCT2013-24
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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A stacked square microstrip antenna with a shorting pin combined with a ring microstrip antenna is proposed for triple band operation. The two microstrip antennas are excited by an L-probe feed. Antenna characteristics (VSWR and radiation pattern) and operational principle are clarified by simulation. Moreover, the antenna is designed for Wimax (2.5GHz, 3.5GHz and 5.8GHz)
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Noritaka WATANABE, Yuuta YAMADA, Masato OGATA, Tsuyoshi MATSUOKA
Article type: Article
Session ID: BCT2013-25
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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We have operated KSU area one-seg broadcasting service targeted at a limited area since September 2012. "KSU" is an abbreviation of "Kyushu Sangyo University". Received field strength of digital terrestrial TV waves transmitted from the TV stations in Fukuoka and the KSU area one-seg broadcasting system is measured at our campus.
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Tomoaki HIRAUME, Tsuyoshi MATSUOKA, Masato OGATA
Article type: Article
Session ID: BCT2013-26
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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GPU (graphics processing unit) has a lot of simple numerical computation cores with parallel operation, and the GPGPU (general purpose computing on GPU) is one of the candidates to improve computation efficiency. In this paper, we numericaly analyze the 1D electromagnetic wave propagation based on the CIP method by using the GPU. The computation times are evaluated by changing the thread size per one block and the results shows that the thread size is chosen to be larger than 64 for efficient computation.
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Teppei ONISHI, Tomotaka BABAZONO, Ken KIHARA, Sakuichi OHTSUKA
Article type: Article
Session ID: BCT2013-27
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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Currently, high-resolution mobile displays have been expanding rapidly, and thus graphical information is becoming increasingly important. During presentation of information, composition is an important factor affecting visibility of the information. Among the graphical information that is widely used in general, we focused on weather forecast figures being broadcast on TV as a typical example of simple and diversified composition. In this paper, we investigated a relationship between composition and visibility by manipulating length of lines separating isolated islands from main islands of Japan. Results of subjective assessment and eye movement measurement experiments demonstrated that the intensity of the division can significantly affect the visibility of weather forecast figures.
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Naohiro MITSUNAGA
Article type: Article
Session ID: BCT2013-28
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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We make a wire antenna for emergencies as preparing an 1 kW auxiliary transmitter for our main MW radio transmitting station. This wire antenna is a 1/4 λ inverted L antenna modified inclined single wire antenna. In order to make it, we newly need only a 10m-high concrete pole. Although it is usually folded up, we can extend it within 15 minutes if needed. The efficiency is as high as 28% by survey, we confirmed that it could be effective to use enough.
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Junichi Honda, Takuya Otsuyama
Article type: Article
Session ID: BCT2013-29
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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This paper describes an algorithm for computing scattered powers from a moving three-dimensional target. The proposed algorithm based on the ray tracing method (RTM) can shorten computation time by simplifying the ray searching procedure. Thus the method can be applied to the large analytical region in comparison with the general RTM. An experimental result of the scattered powers from an aircraft obtained by using the terrestrial digital broadcasting is shown. It is shown that the proposed algorithm is an useful numerical technique by comparing with the experimental data.
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Tsuyoshi MATSUOKA, Masato OGATA
Article type: Article
Session ID: BCT2013-30
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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The TV white space has been attracted attention for effective use of radio frequency, then several applications using the TV white space are introduced. One of the applications is the area broadcasting service. The service is to broadcast TV program to a limited area without interference with other radio service. Kyushu Sangyo University has started to provide the area one-segment broadcasting service to the campus of the university on September, 2012. In this paper, we introduced the area one-segment broadcasting system of the university and achievement with the service. In addition, the possibilities and effectiveness of introducing the area one-segment service to higher education are discussed.
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Naoto KOGO, Tetsuomi IKEDA
Article type: Article
Session ID: BCT2013-31
Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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During live outside broadcasting (OB) of road races, such as marathons and ekiden, video images are taken using cameras on moving OB vans and the signals of the video images are transmitted by FPU in 700 MHz band. The frequency band for the FPU is planned to migrate to 1.2 and 2.3GHz bands by the action plan for radio spectrum reallocation developed by the ministry of internal affairs and communications. After the frequency migration of FPU, the transmission frequency-band will be higher than that of 700MHz band; however, few studies have been performed concerning the effect of OB van on the radiation patterns due to the shape of the OB van. In this report, we designed transmission antennas and OB van and calculated radiation patterns. From the results, we found that the antenna height is the significant parameter for the radiation pattern on the OB van.
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Article type: Appendix
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Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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Article type: Appendix
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Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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Article type: Appendix
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Published: January 23, 2013
Released on J-STAGE: September 21, 2017
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