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Volume 47, Issue 11
Displaying 1-11 of 11 articles from this issue
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Special Issue on SSI2010: Emergence of Systems and Information Technologies to Build Warm Societies
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[in Japanese], [in Japanese]2011 Volume 47 Issue 11 Pages 511
Published: 2011
Released on J-STAGE: January 21, 2012
JOURNAL FREE ACCESSDownload PDF (144K)
Paper
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Makoto ITOH, Yusuke FUJIWARA, Toshiyuki INAGAKI2011 Volume 47 Issue 11 Pages 512-519
Published: 2011
Released on J-STAGE: January 21, 2012
JOURNAL FREE ACCESSThis paper discusses driver's behavioral changes as a result of driver's use of an automatic brake system for preventing a rear-end collision from occurring. Three types of automatic brake systems are investigated in this study. Type 1 brake system applies a strong automatic brake when a collision is very imminent. Type 2 brake system initiates brake operation softly when a rear-end crash may be anticipated. Types 1 and 2 are for avoidance of a collision. Type 3 brake system, on the other hand, applies a strong automatic brake to reduce the damage when a collision can not be avoided. An experiment was conducted with a driving simulator in order to analyze the driver's possible behavioral changes. The results showed that the time headway (THW) during car following phase was reduced by use of an automatic brake system of any type. The inverse of time to collision (TTC), which is an index of the driver's brake timing, increased by use of Type 1 brake system when the deceleration rate of the lead vehicle was relatively low. However, the brake timing did not change when the drivers used Type 2 or 3 brake system. As a whole, dangerous behavioral changes, such as overreliance on a brake system, were not observed for either type of brake system.View full abstractDownload PDF (931K) -
Koichi KOBAYASHI, Kunihiko HIRAISHI2011 Volume 47 Issue 11 Pages 520-526
Published: 2011
Released on J-STAGE: January 21, 2012
JOURNAL FREE ACCESSIn this paper, the optimal control problem of gene regulatory networks modeled by Boolean networks is discussed. In the standard problem formulation, we assume that there exist genes corresponding to control inputs in gene regulatory networks. However, in many systems, this assumption is not satisfied. In this paper, two kinds of control inputs are considered. One is the above control input. The other is the control input corresponding to an external stimulus. An external stimulus does not control the detailed behavior, but can switch Boolean functions probabilistically. So genes corresponding to control inputs may not exist, and this problem formulation is more realistic. Furthermore, the optimal control problem is reduced to an integer linear programming problem.View full abstractDownload PDF (351K) -
Ko NAKAMURA, Tohru KAWABE2011 Volume 47 Issue 11 Pages 527-533
Published: 2011
Released on J-STAGE: January 21, 2012
JOURNAL FREE ACCESSGenerally, heat conduction plants composed of multiple materials can be expressed by the difference formula model with multiple delay times. Such model is not suitable for control design, since it's quite difficult to apply standard linear control design approach. So, we propose new method of deriving a linear state equation model which is suitable to apply the standard control method from the difference formula model. We focus on the relationship between control cycle and sampling interval, and our main idea is the linear interpolation from current step to delay time steps. The derived model has accuracy against original one, and effectiveness of the proposed method is illustrated by numerical examples.View full abstractDownload PDF (775K) -
Toshihiro HIRAOKA, Shota TAKADA2011 Volume 47 Issue 11 Pages 534-540
Published: 2011
Released on J-STAGE: January 21, 2012
JOURNAL FREE ACCESSOur previous paper proposed a deceleration for collision avoidance (DCA) as an index to evaluate the collision risk against a forward obstacle. In order to reduce the calculation amount, the calculation process of the DCA assumed that the following vehicle performed an uniform motion within a constant reaction time. However, the assumption would yield underestimation of the collision risk when the following vehicle accelerates and overestimation when it decelerates. Therefore, in this manuscript, the DCA was calculated on the assumption that the following vehicle kept the uniformly-accelerated motion within the reaction time and the numerical simulation was performed to show that the improved DCA could evaluate the collision risk properly compared to the conventional DCA.View full abstractDownload PDF (787K) -
Yoshihito AKIMOTO, Naoki MORI, Isao ONO, Yoshihiro NAKAJIMA, Hajime KI ...2011 Volume 47 Issue 11 Pages 541-548
Published: 2011
Released on J-STAGE: January 21, 2012
JOURNAL FREE ACCESSIn this paper, we first discuss the notion that artificial market systems should meet the requirements of fidelity, transparency, reproducibility, and traceability. Next, we introduce history of development of the artificial market system named U-Mart system that meet the requirements well, which have been developed by the U-Mart project. We have already developed the U-Mart system called “U-Mart system version 3.0” to solve problems of old U-Mart systems. In version 3.0 system, trading process is modularized and universal market system can be easily introduced.
However, U-Mart system version 3.0 only simulates the single brand futures market. The simulation of the plural brands and plural markets has been required by lot of users. In this paper, we proposed a novel U-Mart system called “U-Mart system version 4.0” to solve this problem of U-Mart system version 3.0. We improve the server system, machine agents and GUI in order to simulate plural brands and plural markets in U-Mart system version 4.0. The effectiveness of the proposed system is confirmed by statistical analysis of results of spot market simulation with random agents.View full abstractDownload PDF (1264K) -
—Application of Combinatorial Auction Method at Planning Phase—Yi QIAN, Nobutada FUJII, Toshiya KAIHARA, Susumu FUJII, Toyohiro UMEDA2011 Volume 47 Issue 11 Pages 549-556
Published: 2011
Released on J-STAGE: January 21, 2012
JOURNAL FREE ACCESSIn this study, a new concept named Real-Virtual Fusion Manufacturing System (RVF-MS) is proposed, which aims to adaptively and effectively deal with both external and internal fluctuations in production by realizing a fusion between real production shop floor (real system) and virtual manufacturing system model (virtual system). In order to realize the proposed methodology, multi-agent system is used for constructing dynamic model in virtual system. In this paper, a new production scheduling mechanism at planning phase for RVF-MS is proposed, where a social contract based approach, named Combinatorial Auction (CA), with Local Search method is applied. The effectiveness of RVF-MS is verified by computational experiments for flexible flow shop problem.View full abstractDownload PDF (685K) -
Shigeyoshi TSUTSUMI, Takahiro WADA, Tokihiko AKITA, Shun'ichi DOI2011 Volume 47 Issue 11 Pages 557-562
Published: 2011
Released on J-STAGE: January 21, 2012
JOURNAL FREE ACCESSDriver's workload tends to be increased during driving under complicated traffic environments like a lane change. In such cases, rear collision warning is effective for reduction of cognitive workload. On the other hand, it is pointed out that false alarm or missing alarm caused by sensor errors leads to decrease of driver' s trust in the warning system and it can result in low efficiency of the system. Suppose that reliability information of the sensor is provided in real-time. In this paper, we propose a new warning method to increase driver' s trust in the system even with low sensor reliability utilizing the sensor reliability information. The effectiveness of the warning methods is shown by driving simulator experiments.View full abstractDownload PDF (2061K) -
Nobuyuki MATSUI, Masaaki KIMURA, Teijiro ISOKAWA2011 Volume 47 Issue 11 Pages 563-570
Published: 2011
Released on J-STAGE: January 21, 2012
JOURNAL FREE ACCESSSynergetic Computer (SC) is a type of self-organizing computation system and has widely used for pattern recognition and/or classification problems. In the conventional SC, the order parameter is usually encoded by real values, which determines internal states. In encoding the information of images, however, the use of complex or hyper-complex values is expected to achieve the outperformance. In this paper, we propose Complex-valued synergetic computer (CVSC) where the order parameter is encoded by complex values. We further investigate the performances of our proposed CVSC through the recognition of gray-scale images, by comparing with the conventional Real-valued synergetic computer (RVSC).View full abstractDownload PDF (1246K) -
Tadahiro TANIGUCHI, Yusuke TAKAHASHI2011 Volume 47 Issue 11 Pages 571-580
Published: 2011
Released on J-STAGE: January 21, 2012
JOURNAL FREE ACCESSIn this paper, we proposed a simple urban model including individuals' travel behavior and residential choice behavior. Multi-agent simulation framework is described. We performed several experiments to evaluate political measures which will solve problems about motorization. As a result, drastic mobility management scheme increased the number of travelers using a train, and the distribution of residences became compact. However, it also increased many agents' total costs of living because of high rent and several kinds of cost including time cost and fatigue cost to reach a station. On the other hand, raising gas price made CO2 emission less and kept total cost of living lower than the drastic mobility management measure. This suggests that to have people use train or bus by changing their attitude might be socially more expensive than to make people chose whether they use car or not under the condition that gas price is raised.View full abstractDownload PDF (1096K) -
Masaya NAKATA, Tomohiro HARADA, Keiji SATO, Hiroyasu MATSUSHIMA, Keiki ...2011 Volume 47 Issue 11 Pages 581-590
Published: 2011
Released on J-STAGE: January 21, 2012
JOURNAL FREE ACCESSThis paper proposes a novel Learning Classifier System (LCS) called Identification-based LCS (IXCS) to promote a generalization of classifiers (i.e., rules) by selecting effective ones and deleting ineffective ones. Through the intensive simulation of the 20-Multiplexer problem, this paper has revealed the following implications which cannot be achieved by the conventional LCS, XCSTS: (1) IXCS can not only generalize the classifiers earlier but also generate the classifiers which are robust to the noisy environment; and (2) IXCS can derive a higher performance with a lower number of micro-classifiers.View full abstractDownload PDF (1840K)
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