SEISAN KENKYU
Online ISSN : 1881-2058
Print ISSN : 0037-105X
ISSN-L : 0037-105X
Volume 66 , Issue 4
Showing 1-16 articles out of 16 articles from the selected issue
Introduction to Special Section
Research Flash
  • Mari SATO, Reiko KUWANO
    2014 Volume 66 Issue 4 Pages 325-329
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    Internal erosion causes various ground disaster such as sinkhole accidents and landslides, those are supposed to happen due to water penetration in the ground. In this research, triaxial test apparatus which are capable of causing internal erosion inside the specimen was developed. Eroded specimen was sheared in drained condition. It was found that at axial strain within 5 %, soil stiffness was decreased due to even small degree of erosion.
    Download PDF (957K)
  • Mari SATO, Reiko KUWANO
    2014 Volume 66 Issue 4 Pages 331-335
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    Internal erosion causes various ground disaster such as sinkhole accidents and landslides, those are supposed to happen due to water penetration in the ground. In this research, one-dimensional seepage test was conducted. There are holes at the bottom plate of the apparatus to allow soil particles to escape. Downward seepage was applied to the specimen to form internal erosion. Tested materials and size of the bottom mesh were changed for investigation of important factors for erosion conditions.
    Download PDF (1205K)
  • Tsubasa SASAKI, Reiko KUWANO
    2014 Volume 66 Issue 4 Pages 337-339
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    Microbial precipitation of calcium carbonate can be a promising soil improvement technique that prevents geohazards with low costs and minimal adversity to the environment. However, most of the existing research employed clean sand which is somewhat unlikely to come by in the real ground. The present study thus deals with more realistic soils namely Urayasu sand that contains 30 % fines content, and the effectiveness of the microbial method was compared by using a clean sand and another realistic soil in addition to Urayasu sand. Cone penetration tests were carried out and it was found that the increase in penetration resistance was much smaller for Urayasu sand relative to the clean sand. It was also revealed that calcium carbonate was successfully precipitated regardless of soil type. Further research needs to be done to explain the reduced increment in soil strength for Urayasu sand, in order to make the microbial soil improvement practically feasible in the near future.
    Download PDF (765K)
  • Yang YANG, Reiko KUWANO
    2014 Volume 66 Issue 4 Pages 341-344
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    Piping, known as a complex phenomenon of internal erosion, presents a great risk for hydraulic structures. In this research, artificial piping in laboratory was created by dissolving glucose column in uniform fine (Toyoura) sand. Properties of loosened sand due to piping effect were studied through a series of triaxial tests under different densities, pipe number and confining pressure. Piping propagation was observed according to the axial strain, radial strain and volumetric strain measured by local transducers. Furthermore, Young’s modulus and Poisson’s ratio of sand with internal pipes were also evaluated under cyclic loading before and after loosening.
    Download PDF (803K)
  • Miho IRYO
    2014 Volume 66 Issue 4 Pages 345-349
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    Although pedestrian flashing green (PF) period in Japan is not sufficient for pedestrians to complete crossings by definition, many pedestrians start crossing after the onset of PF and remains on the crosswalk even at the end of PF. This paper compared pedestrian signal settings in US and in Japan and showed that longer duration between the end of PF and the onset of preceding vehicle green in Japan encourages pedestrians to cross after PF starts. Simulation results implied that the US signal settings can reduce both probability of remaining pedestrians on red and cycle time.
    Download PDF (522K)
  • Akira KODAKA, Akiyuki KAWASAKI, Miho OHARA, Shinya KONDO
    2014 Volume 66 Issue 4 Pages 351-357
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    As a preliminary report on a possibility of cellular phone introduction as a mean for disaster information dissemination in rural mountainous area in Thailand, this paper briefed the results of demonstration experiment and questionnaire survey on SMS message broadcasting conducted in the area. The results show a high possibility that SMS broadcasting would be able to strengthen a current disaster information dissemination system. For practical application of the SMS message, further examination is required including creation of environment that more people will be noticed and informed by SMS message.
    Download PDF (1326K)
  • Anh Nguyet DANG, Akiyuki KAWASAKI
    2014 Volume 66 Issue 4 Pages 359-367
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    The magnitude and pace of human intervention on land resources has markedly increased and unpredicted, therefore, improving land-use planning is crucial task for ensuring sustainable development. Land-use change models have been developed to help land-use planner and policy makers analyze the causes, consequences and impacts land-use changes on earth’s ecosystem as well as socioeconomic system. Land-use change is a complex process, hence, there is no single model could abstract fully the interaction among a large number factors within this processes. Recently, a newer approach known as integrated models has been carried out with the promise of overcoming the limitation of single model application. In the light of that, this research aims to develop an integration methodology which integrate System Dynamic and GIS-based model for modelling the land-use change dynamic in DakLak province, Vietnam up to the year 2030. We do this by: (1) developing System Dynamic model for land-use demand prediction and (2) establishing land allocation model using ArcGIS model builder. This work aim to demonstrate the potential and bring better understanding of integrated approach and provide scientific support for land-use planning and managements in DakLak province, Vietnam.
    Download PDF (745K)
  • Seemanta BHAGABATI, Akiyuki KAWASAKI
    2014 Volume 66 Issue 4 Pages 369-373
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    This paper surveys the different approaches of Game Theory adapted in the literature. The paper shows how the concepts of Game Theory can be used as a tool for dispute management in shared resource utilization. Specifi c applications of Game Theory such as transportation systems, decision support systems, watershed management, regional cooperation etc., are studied and described. Several different game theoretic models are described. Using such models better outcomes can achieved among the same players with same available resources. The paper also opens avenues of future research involving game theory in different fields.
    Download PDF (162K)
  • Hitoshi NAKAMURA, Hiroshi SUGATA, Takaaki KATO
    2014 Volume 66 Issue 4 Pages 375-378
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    The purpose of this paper is to examine actual situations and spatial characteristics of arson fire places in Saitama City. Using the data of arson fires during five years from 2007 to 2011 provided by the Fire Department of Saitama City local government, we examined the relationship between arson fire places and demographic features, arson fire places and transportation facilities, and arson fire places and land use features. We conclude that arson fires tend to occur in the areas where there are many unspecified people activities with lack of the visibility of the community.
    Download PDF (1356K)
  • Junji YOSHINAGA, Jaeho KIM, Taichi SHIMURA, Hiroshi SUGATA, Takaaki KA ...
    2014 Volume 66 Issue 4 Pages 379-382
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    Download PDF (951K)
  • -Substantiated in Nankoku City, Kochi Pref. -
    Koichiro TAKESHIMA, Takaaki KATO, Rie OTAGIRI, Ichiro MATSUO, Atsushi ...
    2014 Volume 66 Issue 4 Pages 383-387
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    As specialists about disaster-prevention, we supported citizens in making an evacuation-plan for tsunami in A-district in Kochi prefecture. We contributed in doing evaluation studies of the roads block in the area, and providing information on the current living conditions of inhabitants in the area in visible form. As a result, the inhabitants were able share the information and be involved in active discussions, which enables us further refine the points of issue. At the same time, it was also revealed that in these community discussions, there is risk of some people being pressurized through silent stress which need to be given heed to. In addition, we could confirm the importance of some types of unclear information, since they act to bring out the participants' individuality and promote further discussions.
    Download PDF (1291K)
  • Yudai HONMA, Shigeki TORIUMI
    2014 Volume 66 Issue 4 Pages 389-392
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    Electric vehicles (EV) have attracted an increasing amount of attention. However, the continuous cruising distance of an EV is limited to around 160 km, which is insufficient for everyday use. Battery capacity is the limiting factor in long-distance EV travel. In planning the EV infrastructure, an appropriate number of chargers must be installed at each station. In this study, on the basis of the supporting infrastructure for widespread EV use, we propose a mathematical model for estimating the number of vehicles arriving at each charge station.
    Download PDF (921K)
  • Akihiko UMEHARA, Muneyoshi NUMADA, Kimiro MEGURO
    2014 Volume 66 Issue 4 Pages 393-396
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    This research analyzes dead body processing during the 2011 Great East Japan Earthquake. The capacity of crematories in the damaged area was limited due to the huge number of deaths caused by the earthquake or tsunami. Since the wide area or mutual supports system plan was not organized in details concerning disaster management, it was difficult to effective or efficiently cope with the deaths. In Miyagi prefecture, the temporal burial method was applied despite exceeding capacity.
    After the disaster, some local governments tried to include a plan for death processing during disasters in their disaster management plan, but the number of those local governments was not enough even in the damaged area of Tohoku. The families with victims caused by disasters normally asks for immediate or effective dead body processing in Japan. However, since the dead body processing method has not been included in disaster management plans, it is difficult to respond quickly during disasters.
    This research presents the results of the analysis of dead body processing in damaged areas and the problems related to its application in disaster management plans.
    Download PDF (595K)
  • Tomofumi IKENAGA, Miho OHARA
    2014 Volume 66 Issue 4 Pages 397-402
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    Efficient investment of disaster measures should be one of the biggest future issues in Japan under the situation that the population in Japan has been decrasing since 2005. In order to discuss ideal future strategy, it is important to assess the integrating risk of natural hazards considering future depopulation.
    This research overlayed existing hazard maps such as earthquake, river flood, landslide, and analyzed regional tendency of the integrated riks of natural hazards. Next, the relationship between the integrated risks and furture depopulation was analyzed and all the prefectures were classified into 9 groups. Finally, future strategy of disaster measures which is suitable for the characteristics of the groups were discussed.
    Download PDF (568K)
Research Paper
  • Yusuke TAKAHASHI, Takao FUJII, Nagayoshi SHIMA, Kazuyuki ISHII, Kazuak ...
    2014 Volume 66 Issue 4 Pages 403-409
    Published: July 01, 2014
    Released: September 27, 2014
    JOURNAL FREE ACCESS
    We developed a small-scale distributed process, which is available at the level of hamlet or village, as a way of recovering radioactive cesium, main cause of radioactive contamination, from the contaminated soil. The process consists of extracting radioactive cesium from the contaminated soil with low environmental impact and recovering the extracted cesium with newly developed cesium adsorbent. Prototype equipment tests were carried out to recover radioactive cesium from 100-200kg contaminated paddy soil in Iitate village, Fukushima prefecture, with the result that the percentage of decontamination reached approximately 90 %.
    Download PDF (788K)
feedback
Top