Murakami K.,Kyushu Sangyo University
Proceedings of IEEE Sensors | Year: 2017
Robot hand/arm systems attempt to insert pins into the sockets to form connectors, such as those in circuit boards. A tactile sensing method using a pin header and a pin socket as a connector is proposed for estimating the insertion state of the connector. The change of the amount of empty space of a pin socket due to the insertion of a pin header is measured by a vibration wave. The vibration wave is transmitted from one fingertip to another opposite fingertip through the grasped pin socket. The spectral intensity of this vibration wave is related to the change of the amount of empty space of the pin socket in the mating process. The insertion state is estimated by the spectral intensity. The frequency of the vibration wave is also calculated for this measurement. To realize this method, robotic fingertips were developed for transmitting the vibration wave. The fingertips perform both the tactile sensing and grasping function, so no additional sensing motion of the robot hand is needed. The measurement of the insertion state was successfully demonstrated in an experiment. © 2016 IEEE.
Honma S.,Kyushu Sangyo University |
Hu J.-L.,National Chiao Tung University
Applied Energy | Year: 2014
Japan's energy security is more vulnerable today than it was before the Fukushima Daiichi nuclear power plant accident in March 2011. To alleviate its energy vulnerability, Japan has no choice but to improve energy efficiency. To aid in this improvement, this study compares Japan's energy efficiency at the industry level with that of other developed countries. We compute the total-factor energy efficiency (TFEE) of industries in 14 developed countries for 1995-2005 using data envelopment analysis. We use four inputs: labor, capital stock, energy, and non-energy intermediate inputs. Value added is the only relevant output. Results indicate that Japan can further optimize energy conservation because it experienced only a marginal decrease in the weighted TFEE, from 0.986 in 1995 to 0.927 in 2005. To improve inefficient industries, Japan should adapt energy conservation technologies from benchmark countries such as Germany, the United Kingdom, and the United States. © 2014 Elsevier Ltd.
Kaneko K.,Kyushu Sangyo University |
Sun Y.,Shanghai JiaoTong University |
Sun Y.,CAS Lanzhou Institute of Modern Physics |
Mizusaki T.,Senshu University |
Tazaki S.,Fukuoka University
Physical Review Letters | Year: 2013
For mirror nuclei with masses A=42-95, the effects of isospin-nonconserving nuclear forces are studied with the nuclear shell model using the Coulomb displacement energy and triplet displacement energy as probes. It is shown that the characteristic behavior of the displacement energies can be well reproduced if the isovector and isotensor nuclear interactions with J=0 and T=1 are introduced into the f7/2 shell. These forces, with their strengths being found consistent with the nucleon-nucleon scattering data, tend to modify nuclear binding energies near the N=Z line. At present, no evidence is found that these forces are needed for the upper fp shell. Theoretical one- and two-proton separation energies are predicted accordingly, and locations of the proton drip line are thereby suggested. © 2013 American Physical Society.
Cheng K.,Kyushu Sangyo University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016
Temporal aggregation is an important query operation in temporal databases. Although the general forms of temporal aggregation have been well researched, some new applications such as online calendaring systems call for new temporal aggregation. In this paper, we study the issue of approximate temporal aggregation with nearby coalescing, which we call NSTA. NSTA improves instant temporal aggregation by coalescing nearby (not necessarily adjacent) intervals to produce more compact and concise aggregate results. We introduce the term of coalescibility and based on it we develop efficient algorithms to compute coalesced aggregates. We evaluate the proposed methods experimentally and verify the feasibility. © Springer International Publishing Switzerland 2016.
Akasaka R.,Kyushu Sangyo University
International Journal of Thermophysics | Year: 2011
New fundamental equations of state explicit in the Helmholtz energy with a common functional form are presented for 2,3,3,3-tetrafluoropropene (R-1234yf) and trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)). The independent variables of the equations of state are the temperature and density. The equations of state are based on reliable experimental data for the vapor pressure, density, heat capacities, and speed of sound. The equation for R-1234yf covers temperatures between 240K and 400 K for pressures up to 40MPa with uncertainties of 0.1 % in liquid density, 0.3 % in vapor density, 2 % in liquid heat capacities, 0.05 % in the vapor-phase speed of sound, and 0.1% in vapor pressure. The equation for R-1234ze(E) is valid for temperatures from 240 K to 420 K and for pressures up to 15MPa with uncertainties of 0.1% in liquid density, 0.2 % in vapor density, 3 % in liquid heat capacities, 0.05% in the vapor-phase speed of sound, and 0.1% in vapor pressure. Both equations exhibit reasonable behavior in extrapolated regions outside the range of the experimental data. © Springer Science+Business Media, LLC 2011.
Ishida K.,Kyushu Sangyo University
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2012
There has been much interest in ways how to solve the inverse scattering problem of estimation of characteristics of an object(electric constant, size, shape, position, etc.) using electromagnetic waves. The problem, particularly for a strongly inhomogeneous object, is often reduced to minimization of a cost function which relates to difference between the observed and the calculated scattered wave when a wave illuminates the object. © 2012 IEICE.
Yonemoto S.,Kyushu Sangyo University
Proceedings of the International Conference on Information Visualisation | Year: 2013
In this paper, we present a marker-less AR framework which enables virtual graffiti creation and reference image generation. Our framework also supports 3D annotations such as image textures (virtual graffiti), 3D objects and 3D text, which are superposed over the video stream. We adopt marker-less tracking technique based on key point based descriptors and the trackers. In general, reference image for marker-less AR must be acquired from real image in advance. In such situation, most marker-less tracking approaches force user to capture the front view of a target object. We suppose that reference image does not have to be captured under such condition. In experiments, we showed the estimation accuracy for reference image generation. And we demonstrated real-time marker-less tracking including reference image generation, easy-to-use virtual graffiti creation and immediate superimposing. © 2013 IEEE.
Akasaka R.,Kyushu Sangyo University
International Journal of Refrigeration | Year: 2010
A new thermodynamic property model is presented for trans-1,3,3,3- tetrafluoropropene (trans-CHFCHCF3, HFO-1234ze(E)) based upon available experimental data. This model is an application of the extended corresponding states principle, which is one approach in property modeling for fluids with limited experimental databases. The model is capable of calculating with reasonable accuracies various properties of HFO-1234ze(E), including the PVT relation, energies, heat capacities, and vapor-liquid equilibrium. The reference fluid of the model is 1,1,1,2-tetrafluoroethane (HFC-134a). Comparisons of calculated values using the model are made with experimental data. Typical uncertainties of calculated properties are 0.2% in the vapor pressure, 0.5% in the liquid density, and 5% in the liquid and vapor isobaric heat capacities. In addition, an ancillary equation is given for the vapor pressure. Thermodynamic property diagrams generated using the model are also provided. © 2010 Elsevier Ltd and IIR. All rights reserved.
Akasaka R.,Kyushu Sangyo University
Fluid Phase Equilibria | Year: 2013
Thermodynamic property models explicit in the Helmholtz energy are presented for the R-32/1234ze(E) and R-32/1234yf mixtures. The Helmholtz energy of the mixtures are expressed as the sum of the ideal mixture contribution and the contribution from mixing. The independent variables are the temperature, molar volume, and composition. The most accurate pure-fluid equations of state are incorporated to calculate the ideal mixture contribution. The contribution from mixing is determined by fitting to available experimental data. The estimated uncertainties in calculated properties from the models are 1% for the bubble point pressure and 0.25% for liquid density. The critical loci of the mixtures are reasonably represented with the models. The calculated critical temperatures correspond to experimental values within ±0.8. K. © 2013 Elsevier B.V.
Cheng K.,Kyushu Sangyo University
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2010
Distributed enterprise applications are typically based on a multiple-tier client-server architecture where large volume of data is transferred between tiers frequently. When the amount and frequency of data to be transferred become large, network bandwidth will become a bottleneck and efficient middle-tier data management is critical. In this paper, we propose a semi-persistence model to capture the evolving nature of data in a middle tier data management system. We also propose to use Bloom Filters (BF) as an efficient data structure to maintain the time-sensitive frequency profile of the underlying data items. We first extend the standard Bloom Filters by replacing the bit-vector with an array of counters. We then optimize it by allocating lowest space necessary for each counter to store its value. The preliminary experiments show that the optimized BF achieves considerable improvement on space usage while providing the same results of frequency profile. © 2010 Springer-Verlag Berlin Heidelberg.