Yuanbo Liu  Soichi Nishiyama  Tomohisa Yano 《International journal of remote sensing》2013,34(11):2121-2139

Although change detection algorithms for temporal remote sensing images have been compared using various datasets, there is no general agreement on their performance for separating change and no-change. This study compared image differencing, image ratioing, image regression, and principal component analysis (PCA) from a mathematical perspective. Error analysis showed that no-change pixels with errors are expected to be located within an error zone in bi-temporal space. Bi-temporal space consists of two temporal axes of target pixel values observed successively. All algorithms confine a no-change area to a zone delineating change and no-change pixels in the space. Image ratioing defines a fan-like sector as a no-change area, generally unsuitable for change detection. The other algorithms confine a no-change area to a strip-like zone. Image differencing defines a no-change zone with a fixed slope, leading to its inability to specify flexibly the error zone that varies with different conditions. In the examined case, image regression and standardized PCA (SPCA) achieved the best performance for change detection, followed by PCA, image differencing, and image ratioing.  相似文献   

    

Ryu Komatsu  Ryo Nakazato  Takeru Sasaki  Akio Suzuki  Naoyuki Senda  Takuya Kawata  Yasuhiro Jimbo  Tomoya Aoyama  Naoto Ohno  Susumu Kawashima  Hisao Ikeda  Shingo Eguchi  Yoshiharu Hirakata  Shunpei Yamazaki  Takashi Shiraishi  Seiji Yasumoto  Masataka Nakada  Masataka Sato  Chris Bower  Darryl Cotton  Andrew Matthews  Piers Andrew  Catalin Gheorghiu  Johan Bergquist 《Journal of the Society for Information Display》2015,23(2):41-49

In this study, a 5.9‐inch foldable active‐matrix organic light emitting diode (AMOLED) display was developed. A folding test was performed repeatedly. The display survived the folding test (100,000 folds) with a curvature radius of 2 mm. To protect an organic light emitting diode (OLED) against moisture, inorganic passivation layers are provided on the upper and lower sides of the flexible display. Using our transfer technology, high density passivation layers can be obtained. The measured water vapor transmission rate of the layer is 7 × 10^?6 g/m²?day or less, which improves OLED reliability. With these techniques, we have developed a book‐type display, which is repeatedly foldable like a book, and a tri‐fold display including a display area, which is foldable in three.  相似文献   

    

Bruce A. Julian  Hitoshi Suzuki  Goce Spasovski  Yusuke Suzuki  Yasuhiko Tomino  Jan Novak 《Proteomics. Clinical applications》2009,3(9):1023-1028

Chronic kidney disease accounts for a significant portion of many national health-care budgets. In this viewpoint, we highlight recent advances in urinary proteomic analyses that potentially may soon enhance the care of afflicted patients. To achieve this goal, cooperation of interdisciplinary teams from around the world will be vital, so as to standardize methodology for preparation urine samples and technical aspects of the analyses, and for better application of results. These collaborative activities will facilitate translational research in kidney diseases.  相似文献   

    

Yoshiki Nakajima  Tatsuya Takei  Toshimitsu Tsuzuki  Mitsunori Suzuki  Hirohiko Fukagawa  Toshihiro Yamamoto  Shizuo Tokito 《Journal of the Society for Information Display》2009,17(8):629-634

Abstract— A 5.8‐in. wide‐QQVGA flexible color active‐matrix organic light‐emitting‐diode (AMOLED) display consisting of organic thin‐film transistors (OTFTs) and phosphorescent OLEDs was fabricated on a plastic film. To reduce the operating voltage of the OTFTs, Ta₂O₅ with a high dielectric constant was employed as a gate insulator. Pentacene was used for the semiconductor layer of the OTFTs. This layer was patterned by photolithography and dry‐etched using a dual protection layer of poly p‐xylylene and SiO₂ film. Uniform transistor performance was achieved in the OTFT backplane with QQVGA pixels. The RGB emission layers of the pixels were formed by vacuum deposition of phosphorescent small molecules. The resulting display could clearly show color moving images even when it was bent and operated at a low driving voltage (below 15 V).  相似文献   

    

Takayoshi Katase  Hidefumi Takahashi  Tetsuya Tohei  Yuki Suzuki  Michihiko Yamanouchi  Yuichi Ikuhara  Ichiro Terasaki  Hiromichi Ohta 《Advanced Electronic Materials》2015,1(12)

The oxygen‐deficient Sr_4−xEr_xCo₄O_12−δ (SECO), one of the ordered perovskite oxides, is a room‐temperature (RT) ferrimagnetic semiconductor that arises from the A‐site‐ordered structure. Development of such a material can lead to the realization of spintronic heterojunction devices; however, to this point there have been difficulties in achieving the A‐site‐ordered structure in SECO thin films. Here, single‐crystalline film growth of SECO with perfectly aligned A‐site‐ordered structure on (LaAlO₃)_0.3(Sr₂TaAlO₆)_0.7 substrates by solid‐phase epitaxy (SPE) method is demonstrated. The brownmillerite‐type, A‐site‐disordered structure of the as‐grown epitaxial film clearly changes into well‐aligned A‐site‐ordered structure after heat treatment at 1050 °C in air; the aligned ordered structure in the film is clearly visualized at atomic level. This ordering induces ferrimagnetism with Curie temperature (T_c) ≈310 K and it is found that the SECO film with p‐type semiconductivity exhibits anomalous Hall effect at the temperature up to 300 K, which is suitable for the test bench to demonstrate advanced spintronic heterojunction devices, operating at RT. The present SPE method is expected to serve as a powerful technique for the fabrication of thin films and exploration of potential characteristics of A‐site‐ordered perovskite oxides.  相似文献   

    

Suyama  S. Suzuki  H. Fukawa  K. Izumi  J. 《Selected Areas in Communications, IEEE Journal on》2009,27(8):1358-1366

This paper proposes an iterative OFDM millimeterwave receiver employing low-complexity decision-directed phase noise compensation (DD-PNC) to alleviate degradation due to the phase noise. High bit-rate OFDM transceivers based on the single-chip Si RF-CMOS IC technology in the 60-GHz millimeter-wave band have been extensively studied for wireless personal area network (WPAN) systems, and the relatively large phase noise in the phase locked loop (PLL) synthesizer severely degrades transmission performance. The proposed OFDM receiver iterates DD-PNC and decision-directed channel estimation (DDCE) by exploiting the output of the channel decoder. DDPNC estimates the phase noise each sampling time by using the decoder output, and then it removes the estimate from a time-domain received signal. In addition, DDCE estimates a channel impulse response by using the compensated received signal. Computer simulations demonstrate that in the 64QAM modulation with the coding rate of 3/4, the proposed receiver with DD-PNC and DDCE can perfectly remove the phase noise of -85 dBc/Hz at 1 MHz offset, and that it can alleviate the degradation of the channel estimation due to the phase noise.  相似文献   

    

R. Urata R. Takahashi T. Nakahara K. Takahata H. Suzuki 《Photonics Technology Letters, IEEE》2006,18(1):67-69

We propose an optically clocked transistor array optoelectronic integrated circuit (OEIC) for both serial-to-parallel and parallel-to-serial conversion (demux/mux), enabling an interface between high-speed asynchronous burst optical labels and CMOS circuitry for optical label swapping. Dual functionality of the OEIC reduces size, power, and cost of the optical label swapper. The capability for greater than 20-Gb/s conversion operation is demonstrated.  相似文献   

    

Tanaka  K. Suzuki  R. Emaru  T. Higashi  Y. Wang  H.O. 《Mechatronics, IEEE/ASME Transactions on》2007,12(5):565-570

This paper presents an experimental study on the development of a cyclogyro-based flying robot with a new variable angle of attack mechanism. A cyclogyro is a flying machine supported in the air by power-driven rotors that rotate about a horizontal axis, like the paddle-wheels of a steamboat. Machines of this type have been designed by some companies but there has been no record of any successful flights. Our design starts with a new variable angle of attack mechanism with an eccentric (rotational) point in addition to a rotational point connecting to a motor. The main feature of the mechanism with the eccentric rotational point is the ability to change attack of angles in accordance with the wing positions (as determined by the rotational angles of the cyclogyro) without actuators. The design parameters (wing span, the number of wings, and eccentric distance) of the flying robot are determined through a series of experiments. Experimental results show that the cyclogyro-based flying robot with the new variable angle of attack mechanism is capable of generating sufficient lift force for flying.  相似文献   

    

J.G. Smith  S. Suzuki 《Journal of Computer Assisted Learning》2015,31(2):133-147

This two‐group, pretest‐posttest, quasi‐experimental study compared secondary students' learning of Algebra II materials over a 4‐week period when identical instruction by the same teacher was delivered through either embedded blended learning (treatment group; n = 32) or a live‐lecture classroom (control group; n = 24). For both groups, instruction was delivered in a normal classroom setting. A math test and a student survey were used to measure students' learning of Algebra II and satisfaction with the instruction. Students in the treatment group showed significantly greater gains in Algebra II test scores and evaluated their learning experiences significantly more positively than did the control group. The great majority (80%) of students in the treatment group preferred the embedded blended learning over traditional live lectures for future learning of math. Students' responses to open‐ended survey questions suggested that students in the treatment group appreciated the: (a) ability to control the pace of instruction; (b) new role of the classroom teacher; (c) lack of distraction in the blended learning environment; and (d) accessibility of the embedded multimedia lessons outside the classroom. This study suggests that screen‐capture instructional technology can be used towards establishing a teacher‐based, embedded blended learning environment within a secondary algebraic classroom.  相似文献   

    

Wassim M. Haddad  Tomohisa Hayakawa  Michael C. Stasko 《Asian journal of control》2007,9(1):11-19

A direct adaptive control framework for a class of nonlinear matrix second‐order systems with time‐varying and sign‐indefinite damping and stiffness operators is developed. The proposed framework guarantees global asymptotic stability of the closed‐loop system states associated with the plant dynamics without requiring any knowledge of the system nonlinearities other than the assumption that they are continuous and bounded. The proposed adaptive control approach is used to design adaptive controllers for suppressing thermoacoustic oscillations in combustion chambers.  相似文献