SEISAN KENKYU
Online ISSN : 1881-2058
Print ISSN : 0037-105X
ISSN-L : 0037-105X
Volume 68 , Issue 4
Showing 1-13 articles out of 13 articles from the selected issue
Introduction to Special Section
Research Flash
  • Miho IRYO, Charitha DIAS, Hironori KATO, Keisuke SHIMONO, Kimihiko NAK ...
    2016 Volume 68 Issue 4 Pages 281-284
    Published: July 01, 2016
    Released: July 29, 2016
    JOURNAL FREE ACCESS

    Personal Mobility Vehicles(PMVs) are emerging as a new transport mode particularly for short distances trips. Before allowing those on shared road stretches in Asian cities with high demand of pedestrian and cyclists, interactions between PMVs and other road users should be properly understood. With suitable modifications and proper calibration, exiting pedestrian simulation models or car-following models could be used to model such interactions on shared spaces. In order to explore the feasibility of modifying and calibrating such modelling approaches, a series of experiments were conducted. As an initial step, the data obtained through these experiments were analyzed focusing specifically on components of pedestrian simulation models or car-following models.

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  • Yudai HONMA, Yusuke SHINOHARA, Yasunobu CHIBA, Hayato ITSUMI
    2016 Volume 68 Issue 4 Pages 285-288
    Published: July 01, 2016
    Released: July 29, 2016
    JOURNAL FREE ACCESS

    In this paper, we propose a power consumption optimization with respect to node on/off switching. In particular, we present an integer optimization problem which enables us to describe suitable green networking as functions of network topology, traffic matrix, and link bandwidths. Furthermore, we show an approximation algorithm based on Multinomial Logit Based (MLB) routing protocol, which is a new multi-path routing and Genetic Algorithm Based on Co-evolution. By numerical examples, we have discussed that our methods causes significant improvements in green networking.

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  • Yohei OKIMURA, Yudai HONMA, Takamori UKAI, Osamu KURITA
    2016 Volume 68 Issue 4 Pages 289-292
    Published: July 01, 2016
    Released: July 29, 2016
    JOURNAL FREE ACCESS

    Fireworks displays in metropolitan area are typical features in Japanese summer. When we enjoy fireworks displays, we should take into account the existence of surrounding buildings, shielding visibility of fireworks. In this study, we think about the visibility of fireworks in the area which has a lot of buildings and evaluate quantitatively the amount of fireworks caught in the field of vision, considering the shielding by buildings and the view-points of fireworks. In this study, indicators of evaluating the visibility of fireworks are following two, “Solid Angle” and “Visibility Ratio”. Solid Angle is the indicator of the amount of fireworks caught in the field of vision, that is, how large is fireworks that a spectator is enjoying. Visibility Ratio is the indicator of what percentage of the whole of fireworks is caught in the field of vision, and this indicator is calculated directly from the definition of Solid Angle. Furthermore, this paper presents the application of this mathematical model to some fireworks displays annually held in Tokyo metropolitan areas, and the demonstration of the visibility evaluation.

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  • Chihiro HONMA, Yudai HONMA
    2016 Volume 68 Issue 4 Pages 293-296
    Published: July 01, 2016
    Released: July 29, 2016
    JOURNAL FREE ACCESS

    Though the piano is originally a European instrument, many Japanese people are more familiar with the piano than they are with Japanese instruments. Piano culture expanded in Japan during the period of high economic growth, namely from 1954 to 1973, and therefore today many in Japan play the piano. However, piano culture developed even more substantially following the period of high economic growth, especially from the 1980s onward. For example, during this period many of those learning to play the piano participated in piano competitions. This study focuses on piano culture in Japan from the 1980s. We analyzed the 1980s piano culture from the viewpoints of both interviews and mathematical analysis based on big size piano competition data.

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  • Natsumi HARA, Hideomi GOKON, Kimiro MEGURO
    2016 Volume 68 Issue 4 Pages 297-301
    Published: July 01, 2016
    Released: July 29, 2016
    JOURNAL FREE ACCESS

    The magnitude 7.8 Gurkha, Nepal Earthquake in 2015 killed over 9,500 people including surrounding countries. Even after one year, high-resolution ground motion distribution has not been identified due to the small number of seismic observation points. This study develops a new approach to estimate the distribution of earthquake ground motion by integrating remote sensing technology and earthquake engineering. First, visual interpretation of high-resolution satellite images was conducted to estimate building damage in the affected areas. Next, the distribution of Peak Ground Acceleration (PGA) was estimated by use of the fragility function.

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  • Mayuko HOTTA, Reiko KUWANO
    2016 Volume 68 Issue 4 Pages 303-306
    Published: July 01, 2016
    Released: July 29, 2016
    JOURNAL FREE ACCESS

    A number of cavities develop below the roads. Subsurface cavities gradually grow and when they reach near the surface, the road depression or cave-in may happen.

    In this study, data of subsurface cavities obtained in Fukuoka city were examined with some geographic factors such as landform, traffic and underground structure using GIS. It was found that landform and sewer pipe affected on cavity formation. Furthermore, the growing speed and volume of some cavities were calculated.

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  • Yuki HORIUCHI, Reiko KUWANO
    2016 Volume 68 Issue 4 Pages 307-310
    Published: July 01, 2016
    Released: July 29, 2016
    JOURNAL FREE ACCESS

    A number of sand boiling occurred in the coast of Tokyo Bay at Great East Japan Earthquake. A series of model tests was conducted to simulate the phenomenon of sand eruption from the crack of pavement. A model sand layer was prepared in the small soil chamber and the surface was covered by an acrylic lid with a slit opening. Water penetrated into the model sand ground from bottom to top. When the hydraulic gradient well exceeded critical hydraulic gradient, sand eruption has started. Liquefaction was generated also by the 1G shaking table test. Furthermore, effects of grain size on the sand eruption were studied using two layer ground of different mean particle size.

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  • Shunya SUZUKI, Reiko KUWANO
    2016 Volume 68 Issue 4 Pages 311-314
    Published: July 01, 2016
    Released: July 29, 2016
    JOURNAL FREE ACCESS

    Recently Methane Hydrate(hereafter MH) as known as next-generation energy has got attention. It was identified that this natural resource called “combustible ice” is restored by filling the void of the seabed around Japan, such as Nankai Trough, which is high-pressure environment, the depth of the sea is about 1000m,10MPa in pressure. One of the problems to be solved for commercial production is sand production from MH layer to inside of the gas production well, penetrating through a gravel-pack layer. In this study, a series of permeability column tests was conducted using two-layer specimen, simulating a gravel pack layer and a MH layer in order to observe the migration of fines in gravels.

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  • Muneyoshi NUMADA, Satoshi TAKATSU, Eriko HAYASHI, Kazuo KONDO, Sumiyo ...
    2016 Volume 68 Issue 4 Pages 315-320
    Published: July 01, 2016
    Released: July 29, 2016
    JOURNAL FREE ACCESS

    Institute of Industrial Science of the University of Tokyo conducts the drill for initial disaster phase to check the safety of all members by safety confirmation sheets. The sheets are filled with all members name of the institute by a pen. The aggregation of all sheets is hard to manage. In this research, the evacuation information management system COCOA is applied to input all name of the institute to check their safety following the sheets information to avoid an inefficient aggregation. The results show the effectiveness of COCOA to share the information by real-time information gathering, categorizing and visualizing.

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  • Kento HIRAYAMA, Hideomi GOKON, Kimiro MEGURO
    2016 Volume 68 Issue 4 Pages 321-325
    Published: July 01, 2016
    Released: July 29, 2016
    JOURNAL FREE ACCESS

    Considering the situation that the population of Japan is declining now and in the future, population induction from high disaster risk area to low disaster risk area is a realistic way to decrease the amount of damage by the future hazard. And when we can reduce future damage, there is some possibility to change the rate of Japanese earthquake insurance system, which includes now a kind of inequality among the people exposed to the different risk of disaster. The aim of this study is to check these effects of population induction. The results show that population induction can decrease most of the damage in year 2040 and that the rate can be much cheaper though the system is changed in proportion to the risk when it will be done considering the avoidance of earthquake and tsunami.

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  • Daikichi KOBAYASHI, Takaaki KATO, Dai KAWAHARA
    2016 Volume 68 Issue 4 Pages 327-330
    Published: July 01, 2016
    Released: July 29, 2016
    JOURNAL FREE ACCESS

    For the purpose of considering evacuation behavior characteristic during post-earthquake urban fire spreading, we experimented with Virtual Reality. Through this research, we got 2 outcomes. First, we developed a technique for realistic representation of fire in an urban setting using VR tools. Second, we made a plan and conducted preliminary experiment to understand the evacuation behavior of people. There are 2 points that the preliminary experiment has revealed. First point is that in the case of one fire, majority of the people evacuate at the standing position of 300m from the fire location. Second point is that majority people tend to feel that fire happened closer than the measured value.

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  • Takuya MASAMOTO, Hideomi GOKON, Shunichi KOSHIMURA, Kimiro MEGURO
    2016 Volume 68 Issue 4 Pages 331-335
    Published: July 01, 2016
    Released: July 29, 2016
    JOURNAL FREE ACCESS

    A number of people were killed by the 2011 Tohoku(Great East-Japan) Earthquake and its induced Tsunami. Evacuation before the arrival of Tsunami is important to survive, however, it might be sometimes difficult for the people who are in a coastal area to escape. To overcome this situation, self-floating evacuation facility has been proposed by Meguro(2011). In this study, two-dimentional spatial distribution of fluid force in Kochi area is analyzed assuming the Nankai Trough massive earthquake and Tsunami. First, Tsunami numerical modeling was conducted and the distribution of hydrodynamic force was calculated. Next, the force that acts on the selffloating evacuation facility was estimated by using the result of Tsunami numerical modeling. As the result, a maximum force acting on the facility was calculated as 567.2 kN.

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