SEISAN KENKYU
Online ISSN : 1881-2058
Print ISSN : 0037-105X
ISSN-L : 0037-105X
Volume 62 , Issue 4
Showing 1-37 articles out of 37 articles from the selected issue
Introduction to Special Section
Research Flash
  • Michael HENRY, Yoshitaka KATO
    2010 Volume 62 Issue 4 Pages 285-288
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    Concrete is a fundamental component of the infrastructure necessary to support human society, but also carries with it a high environmental impact. In order to reduce this impact, the concrete industry needs to adopt sustainable practices, but the means for evaluating sustainable practice is not clear. In order to better understand what criteria should be used for evaluating sustainable practice, a survey of the Japanese concrete industry was conducted which focused on the importance of a variety of factors, including both concrete performance parameters and sustainability indicators. It was found that most people believe the Japanese concrete industry should change to consider sustainable practice and that they would be positively affected by those changes. Durability and cost - particularly life cycle cost - were given the highest importance for evaluating sustainable practice. Concrete performance parameters were generally given higher importance than sustainability indicators, but atmosphere, land, and consumption and production patterns were also identified as important. Barriers to sustainable practice were also identified, with most emphasis placed on institutional and knowledge barriers.[This abstract is not included in the PDF]
    Download PDF (1112K)
  • Michael HENRY, Yoshitaka KATO
    2010 Volume 62 Issue 4 Pages 289-292
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    A social study was performed on how to assess concrete material sustainability in the Japanese concrete industry. The perspectives were converted to weights using Analytic Hierarchy Process, a multi-criteria decision-making tool, and the sustainability of several concrete mixtures was compared. It was found that fly ash concrete mixes with normal or recycled aggregates had the highest weights, and between these mixes the reduction in strength from using recycled aggregates was offset by the value of recycled materials. The absolute sustainability of the mixes could also be assessed.[This abstract is not included in the PDF]
    Download PDF (311K)
  • German PARDO, Michael HENRY, Tsugio NISHIMURA, Yoshitaka KATO
    2010 Volume 62 Issue 4 Pages 293-296
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    Now it is known the usage of different kind of by-products and recycled materials in the concrete industry, most of them showing that can be possible decrease the amount of carbon dioxide emissions and the consumption of virgin materials, and at the same time to have a concrete with good mechanical performance. In this paper were evaluated the mechanical performance, cost and CO2 emissions for different types of concrete. For these cases were replaced cement with fly ash and normal aggregate with recycled aggregate in order to see the water-binder ratio, aggregate type and fly ash effect; then were evaluated the strength, air permeability, carbon dioxide emissions and volume of recycled material for every series. After that a structural design for a simple supported beam was calculated based upon the results obtained from the experimental tests for all the series. For the structural design were considered different cases taking into account common parameters for every case like load, length, section, reinforcement, carbon dioxide emissions or cost and finally evaluating and comparing them. It was found that it is possible to utilize green concrete with high volume of recycled materials, since it has a good balance between the mechanical performance, cost and CO2 emissions compared with normal concrete.[This abstract is not included in the PDF]
    Download PDF (337K)
  • Hiromichi YAMASHITA, Michael HENRY, Tsugio NISHIMURA, Yoshitaka KATO, ...
    2010 Volume 62 Issue 4 Pages 297-301
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    In order to conserve raw materials and reduce waste disposal, this research investigated the utilization of large volumes of waste materials in concrete. Specifically, the usage of rubber chips was focused on due to the increase in the amount of waste tires in Japan. The effect of different volumes of rubber chips on the mechanical and environmental performance was experimentally examined, looking particularly at the combination with other waste materials such as fly ash and recycled aggregate. The results showed that increasing the amount of rubber chips greatly decreased the strength and didn't significantly reduce the environmental impact.[This abstract is not included in the PDF]
    Download PDF (784K)
  • -Influence of Adhesive Resin on Shear Capacity Carried by Fiber Sheet-
    Hironori KOJIMA, Masamistu SUZUKI, Tsugio NISHIMURA, Masanori ITO, Yos ...
    2010 Volume 62 Issue 4 Pages 303-306
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    After an earthquake, it is necessary to quickly repair damaged structures in order to prevent further damage due to aftershocks; however, current retrofitting technologies are time-consuming or difficult to apply. The authors, therefore, propose an emergency retrofitting method for RC structures which is safe and easy to apply by developing fiber sheets with hydraulic resin, which can harden after exposure to water. In this paper, the adhesion behaviors of hydraulic and epoxy resins were investigated experimentally. It was found that although the adhesive strength of the hydraulic resin was low, ductile behavior was observed and the reinforcement effect was similar to that of the epoxy resin.[This abstract is not included in the PDF]
    Download PDF (751K)
  • -Influence of Adhesion Properties on Reinforced Shear Capacity-
    Masamitsu SUZUKI, Hironori KOJIMA, Tsugio NISHIMURA, Masanori ITO, Yos ...
    2010 Volume 62 Issue 4 Pages 307-310
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    A new rapid emergency retrofitting method for disaster-damaged structures is developing utilizing fiber sheet containing hydraulic resin. This paper conducted an experimental study on the application characteristics which contribute to the shear capacity when using a hydraulic polyurethane resin with adhesive resin. It was found that the overlap splice strength contributed the most to the shear capacity. The target value of the overlap splice strength should be comparable to the tensile strength of fiber sheets. It's considered that this information could be useful for choosing the type of adhesive resin with shear reinforcement.[This abstract is not included in the PDF]
    Download PDF (1403K)
  • -Potential Application to Actual Structures-
    Masamitsu SUZUKI, Fumihiro OJIMA, Hirokazu KITAZAWA, Masanori ITO, Tak ...
    2010 Volume 62 Issue 4 Pages 311-314
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    This paper examined the potential application of a rapid emergency retrofitting method using hydraulic polyurethane resin to actual structures by studying the structural performance and construction performance using column members. It was found that the repair effect of the method as compared to the conventional epoxy method was confirmed by tests on a shear-damaged column member, and the construction time was confirmed to be shorter than conventional methods. From these results the potential application to actual structures was demonstrated.[This abstract is not included in the PDF]
    Download PDF (874K)
  • Hiroki KABAYAMA, Shota MIZUKAMI, Kenji HAYAKAWA, Yoshitaka KATO, Taket ...
    2010 Volume 62 Issue 4 Pages 315-318
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    In this research, authors selected member size and curing as construction conditions and conducted a quantitative experimental investigation on their influence on compressive strength and mass transport properties. The influence of member size on the seismic damage and air permeability of the concrete cover were measured and the influence of concrete bleeding and height direction were confirmed. The influence of curing condition could be seen in both compressive strength and air permeability and, as a result, the non-stationary period could be calculated because the diffusion coefficient of the chloride ion was not sensitive to the influence.[This abstract is not included in the PDF]
    Download PDF (527K)
  • Kenji HAYAKAWA, Yoshitaka KATO
    2010 Volume 62 Issue 4 Pages 319-322
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    The quality of cover concrete, which is very important for durability of reinforced concrete structure, is accepted the execution conditions of works such as casting and consolidation, curing. Therefore, it is effective to secure the durability, if the cover concrete of structure can be inspected directly. For this purpose, it is necessarily to know quality variation of cover concrete by the execution conditions of works. This experiment investigated the air permeability index, which is possible to examine for structural concrete, percentage of voids for core samples in full size specimens under variable execution condition of works. As a result, quality variation in the standard construction works and condition was indicated, and the variation of durability index for surplus consolidation was larger in the high slump than low slump concrete.[This abstract is not included in the PDF]
    Download PDF (466K)
  • Hiromu MURAKAMI, Nanayakara OMINDA, Yoshitaka KATO, Taketo UOMOTO
    2010 Volume 62 Issue 4 Pages 323-326
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    It is believed that the corrosion speed of macrocell corrosion is dominated by the rate of anodic and cathodic area. However, this mechanism is not clear so this research investigated the effect of cathodic area on macrocell corrosion speed. When the cathodic areas increased, macrocell density declined due to the influence between elements. However, it was confirmed that this ratio had a similar tendency regardless of the specimen condition. As a result, when measuring the polarization curves, the resistance related to macrocell density could be confirmed.[This abstract is not included in the PDF]
    Download PDF (601K)
  • Soichiro SAITO, Shota MIZUKAMI, Tsugio NISHIMURA, Yoshitaka KATO, Futo ...
    2010 Volume 62 Issue 4 Pages 327-330
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    In this study, in order to understand the behavior of water in the cracks quantitatively, a study conducted water absorption and desiccation test with in cracked concrete specimens. It was found that immersion in water was almost the same as rain exposure when considering the behavior of absorption water. Therefore, the immersion in water was used as a water absorption test. These results found that the difference of crack width set by this experiment hardly influenced the behavior of water absorption and the water content ratio in the cracks immediately exceeded 90%. The water desiccation test showed that the difference of the water content ratio hardly influenced the behavior of water desiccation. The time for water desiccation completely was much longer than water absorption.[This abstract is not included in the PDF]
    Download PDF (660K)
  • Hiroshi YOKOTA, Koichi FURUYA
    2010 Volume 62 Issue 4 Pages 331-334
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    In this study, many concrete cores were sampled from a pier slab, and chloride ion in the concrete was measured. The influence of acquired data from the concrete cores on the corrosion prediction of the concrete structure was examined. As a result, chloride ion concentrations vary greatly and only about 50% of the data remain in the standard deviation. Appropriate numbers of cores are proposed to reduce the error associated with the variation.[This abstract is not included in the PDF]
    Download PDF (437K)
  • Ema KATO, Yuichiro KAWABATA, Mitsuyasu IWANAMI, Hiroshi YOKOTA
    2010 Volume 62 Issue 4 Pages 335-337
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    In this paper, RC slabs extracted from an open-type wharf were tested in order to evaluate the relationship between visually judged deterioration grades and load carrying capacities. Based on the statistical analysis on the relationship between deterioration grades and load carrying capacities, the probabilistic evaluation method of the load carrying capacities of whole RC slabs in an open-type wharf was proposed as quantitative evaluation method of residual structural performance of existing port RC structures.[This abstract is not included in the PDF]
    Download PDF (482K)
  • Reiko KUWANO, Hiroaki EBIZUKA
    2010 Volume 62 Issue 4 Pages 339-342
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    Earth pressures acting on underground structures are highly dependent on the interaction between ground and structure. Increase in the vertical earth pressures acting on a buried structure in high embankment should be, therefore, considered, depending on the size and depth of structure and type of foundation, since differential settlements are often expected in such conditions However, in practice, the increment of vertical earth pressures on underground structures is estimated in the empirical manner, mainly based on the information of past earth pressure measurements in the limited number of sites. In such estimation, the degree of settlement and/or mechanical properties of backfill materials are not always taken into account. A trap door test apparatus is newly developed in this research, in order to evaluate distribution of earth pressures acting on a buried structure. Detailed measurements were conducted and earth pressure change was estimated in relatively simple calculation.[This abstract is not included in the PDF]
    Download PDF (1148K)
  • Mari SATO, Reiko KUWANO
    2010 Volume 62 Issue 4 Pages 343-346
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    A cave-in tends to happen above and around a buried structure. It is assumed that the permeability at the interface between a structure and the ground may be higher than that in the ground, causing the formation of water pathway at the interface. Such water pathway may be a trigger for the further subsurface erosion, which accelerate the formation of cavity and loosening in the ground.
    In order to study the possible formation of water pathway around a buried structure, constant head permeability tests on sand with a buried acrylic cylinder was conducted. It was found that permeability change is affected by the surface condition at the interface, grain size distribution, soil density, and etc.[This abstract is not included in the PDF]
    Download PDF (854K)
  • Makoto HOSOO, Reiko KUWANO
    2010 Volume 62 Issue 4 Pages 347-351
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    A new technique of ground improvement by microbial function has been recently proposed, as more eco-friendly technique than conventional one. Metabolic function of microbes produces carbon dioxide, which helps to generate calcium carbonate. In this study, a series of trial test was conducted in order to evaluate the degree of soil cementation generated by those function in Toyoura sand specimens filled in a syringe. It was found that the concentration of nutrient affected the amount of precipitated calcium carbonate in sand.[This abstract is not included in the PDF]
    Download PDF (721K)
  • DongHee KO, Reiko KUWANO
    2010 Volume 62 Issue 4 Pages 353-357
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    Buried pipes play an important role for transporting water, sewage, electricity, gas, communication cables, and etc. Their construction has been rapidly progressed as the development of city so far. Nowadays in urban area, management and renewal of existing old buried pipes become more serious issue than new construction of pipes.
    In this research, trenchless renewal method for an old existing pipe, putting inner flexible lining without ground excavation, was investigated. A series of laboratory model tests have been conducted to examine effects of backfill soil condition and host pipe deterioration on the behavior of flexible liner of double-layered pipe by trenchless renewal.[This abstract is not included in the PDF]
    Download PDF (3245K)
  • Tsutomu TAKAISHI, Muneyoshi NUMADA, Masasuke TAKASHIMA, Kimiro MEGURO
    2010 Volume 62 Issue 4 Pages 359-362
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    After the tsunami was occurred by Sumatra earthquake in 2004, installing of tsunami warning system in Indian Ocean was proposed by international activity. But it is difficult for Indian Ocean Rim countries with less resource of technologies compared to Pacific Ocean. Therefore we propose “Tsunami Warning System Using Multi-Purpose Maritime Observation Buoy Network” in this research. In this research, for installing cheap observation buoy in shore Indian Ocean, We experienced observation buoy installing echo sounding system off Hiratsuka in Kanagawa Prefecture in 2008. Result of experiment, we showed echo sounding system can correctly measure wave height and verified possibility of set and retrieved observation buoy by fishermen.[This abstract is not included in the PDF]
    Download PDF (1565K)
  • Tsutomu TAKAISHI, Muneyoshi NUMADA, Kimiro MEGURO
    2010 Volume 62 Issue 4 Pages 363-366
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    Mw8.8 earthquake occurred in Off-Chile, 03:34 (Chile Local Time), Feb.27, 2010 and it generated tsunami. The tsunami hit many parts of Pacific rim regions and caused damage there. In Japan, Japan Meteorological Agency announced high level warning for the tsunami, because many coastal regions had been damaged by the tsunami due to the 1960 Off-Chile earthquake of Mw9.5. In this report, we analyzed wave data recorded at Hiratsuka Marine Observatory managed by Kanagawa Prefecture. From the shape of wave and spectral analysis, we have confirmed that the tsunami with height of 40cm had come to off-Hiratsuka at around 15pm, Feb.28, 2010 (Japanese Local Time).[This abstract is not included in the PDF]
    Download PDF (1148K)
  • Tsuyoshi IHARA, Muneyoshi NUMADA, Kimiro MEGURO
    2010 Volume 62 Issue 4 Pages 367-370
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    Recently, various railway damages due to a large-scale earthquake disaster are reported. Fortunately, damages have not still occurred to the railway passengers. Occurrence of large-scale earthquakes at a peak hour will cause enormous damage for railway users. In this study, we analyzed force act on the human body under the situation in which the impact shock to running train at a peak hour, and tracked passenger's behavior in a crowded train by Crowd Action Analysis Model using Distinct Element Method Oval. As a result, it became clear that when the train inclined, big damage occurs to the passenger. However, in case of the inclination of vehicle is 20 degrees, it became clear that increased of strap can reduce the force act on the railway passenger's.[This abstract is not included in the PDF]
    Download PDF (728K)
  • -Trial in Shin-Koiwa North District of Katsushika City in Tokyo-
    Takaaki KATO, Kinji ISHIKAWA
    2010 Volume 62 Issue 4 Pages 371-376
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    There are high-density and broad urban areas below the sea level, we call "BELLOW-SEA-LEVEL CITIES (BSLCs)" in Japan. There are few safe evacuation areas in neighborhood in case of flood disaster. The risk will be estimated increase corresponding to forthcoming climate change. Some sorts of countermeasures from the aspect of urban plan and architecture will essential in below-sea-level city in preparation for gradual mega-flood disaster risk rising. We have implemented a series of community-based activities for both short-term and long-term countermeasures consideration through resident collaborative workshops in Katsushika City of Tokyo since 2006.[This abstract is not included in the PDF]
    Download PDF (1832K)
  • Takaaki KATO, Mitsuaki KOBAYASHI, Naohide SATO, Teruyoshi YOTSUYANAGI
    2010 Volume 62 Issue 4 Pages 377-380
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    The information-gathering on disaster afflicted area is essential to implement contingency response and recovery smoothly. According to The Basic Act on Disaster Countermeasures, the disaster countermeasures office established in a city government has responsibility to do, however, the limitation of ability of the office makes each organization independently gather and analyze information. A scheme to share such information with all the organizations will contribute to quick response. This paper introduces “Geospatial Disaster control Mash−up System”, which we are developing. The concept of the system has been considered by discussion with private companies which organizes GITA-JAPAN.[This abstract is not included in the PDF]
    Download PDF (663K)
  • Yuto SHIOZAKI, Takaaki KATO, Hitoshi NAKAMURA, Osamu KOIDE
    2010 Volume 62 Issue 4 Pages 381-386
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    It is estimated that climate change will increase the occurrence frequency of large-scale flood in the future. The improvement of evacuation is important in short term, but the building of flood-resistant city is also necessary in mid and long term, preparing for the future when the adverse effect of climate change is notable. Hence we investigated the actual situation of flood countermeasures by municipal regulation and guidance in built-up area. This investigation will lead to the discussion to improve the flood counter measure in built-up area.[This abstract is not included in the PDF]
    Download PDF (1019K)
  • Muneyoshi NUMADA, Ruriko HIROTA, Katsuhisa SAITO, Kimiro MEGURO
    2010 Volume 62 Issue 4 Pages 387-391
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    Various crime prevention activities are developed in the whole area. However, the activity of each group is often being supported by the individual centered in the region and activity, and also there are problems such as the aging, the talent securing and continuance of activities.
    This research develops the total support system for the crime prevention activity in the region to analyze the characteristic of crime occurrence and current crime prevention activity. It introduces the function of the system in each process from the analysis of the crime situation of the occurrence to the activity of every day in this thesis.[This abstract is not included in the PDF]
    Download PDF (1107K)
  • Katsuhisa SAITO, Muneyoshi NUMADA, Kimiro MEGURO
    2010 Volume 62 Issue 4 Pages 393-397
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    It is necessary to understand the characteristics of crimes by looking down at their environment for reducing crimes for children. the authors have analyzed crime environment for children and have proposed a system for collecting crime information and analysis that can support establishment and implementation of proper countermeasures. Specifically, the authors release crime information mail delived by public administration into databases for crime analysis and compare the results of a analysis to official crime statistics collected by the police. As a result,system have chance can make a contribution to regal volunteer leader except theft and abuse problem. So It is very important to decision them that official crime statistics.[This abstract is not included in the PDF]
    Download PDF (649K)
  • Miho OHARA, Kimiro MEGURO
    2010 Volume 62 Issue 4 Pages 399-402
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    Several big earthquakes might occur in the near future in Japan. It is essential for disaster base hospitals to check structural and non-structural damage as soon as possible after an earthquake in order to prepare for accommodation of expected injured patients. In this research, system for collecting damage information in hospitals was developed. In the disaster drill of a hospital, all the damage information was collected within 30 minutes using this system. It was verified that the system could serve as a useful tool for quick understanding of hospital damage during earthquake disaster.[This abstract is not included in the PDF]
    Download PDF (1866K)
  • Makoto FUJIU, Miho OHARA, Kimiro MEGURO
    2010 Volume 62 Issue 4 Pages 403-407
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    In Japan, several big earthquakes are expected to occur in the near future. A lot of structural damages due to these earthquakes will cause enormous needs for building damage assessment. However, current number of human recourses who are trained with the procedure of building damage assessment is not enough. It is necessary to increase the number of investigators before a next event. In this research, new training system for building damage assessment using e-learning. The system was designed based on the lessons learnt from past assessment experiences and prototype images of the system new training system were developed.[This abstract is not included in the PDF]
    Download PDF (955K)
  • Akiyuki KAWASAKI, Kimiro MEGURO
    2010 Volume 62 Issue 4 Pages 409-416
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    The approach of disaster response and relief efforts has been changing with evolutional development of web-based geospatial technologies. The purpose of this article is to examine how disaster response and relief efforts have been changing along with recent geospatial technological development, mainly from Haiti earthquake response in 2010. This paper outlines how conventional GIS disaster responses by governmental agencies and relief response organizations and the way of geospatial data sharing have been innovatively transforming into more dynamic, opener, and more decentralized way with a wider range of participation. Finally, the paper discusses lessons learned from recent responses and some thoughts for future development.[This abstract is not included in the PDF]
    Download PDF (3089K)
  • Shinya KONDO, Kiyomine TERUMOTO, Kazuyoshi OTA, Yasuhiro KATAIE, Hidek ...
    2010 Volume 62 Issue 4 Pages 417-419
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    The Mid Niigata Prefecture Earthquake, 61 districts were isolated by sediment disaster blocked roads and communication transmission line failure. Tonankai and Nankai Earthquake which are expected to occur during the next thirty years, many districts will be isolated over a wide area. In this paper, districts were assessed isolated risk in widespread disaster focused on road blockade and number of days of construction. Then support program for districts were developed based on isolated risk and direct damage, and isolated district map people can look down at each district's support program were developed.[This abstract is not included in the PDF]
    Download PDF (918K)
  • Yu TAKANO, Kimiro MEGURO
    2010 Volume 62 Issue 4 Pages 421-423
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    When a natural disaster happens within and around tourist spots, the number of tourists decreases even if there is no damage or even after recovery. In previous studies, it is said that harmful rumors and hesitation in tourism are the major reasons of the decrease, but these studies had no survey from the viewpoint of tourists. In this paper, the decrease in travel and tourism to affected regions after a natural disaster is studied by conducting surveys through a case study on the Iwate-Miyagi Nairiku Earthquake in 2008 and by opinion poll. The survey results show that the main reason for the decrease is judgment that “it seems dangerous,” which is not based on the real situation. Information of the situation of affected regions should be informed especially to the people living in other prefectures who may be tourists in future. However, by the examination of articles of newspaper, it was proved out that, to these people, little information on safety and reconstruction was delivered. To consider sources of information, experts on disaster or organizations such as tourism associations that are near to the affected regions are more reliable than national government or travel agencies. To the people who have plans to travel to affected regions, tourism associations and hotels need to carry information on their own situations clearly. Also, there is a difference in recognition of what is necessary for affected regions between tourists and people living in tourist spots. Although people in tourist spots want tourists to visit and to spend money as usual, tourists generally think that to visit these spots would not be effective help for them. Thus, it is vital to provide information on safety and to inform people about the importance of providing support to affected regions by visiting them.[This abstract is not included in the PDF]
    Download PDF (583K)
  • Kohei MAKINODAN, Miho OHARA, Kimiro MEGURO, Tetsutaro SUMI
    2010 Volume 62 Issue 4 Pages 425-429
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    In recent years, it is reported that the Koto Delta in Tokyo including the area whose elevation is lower than sea level has large-scale flood risk. According to the Cabinet Office in Japan, the maximum predicted number of death is approximately 3,500 and that of isolated persons is approximately 720,000. In this paper, considering whole Koto Delta as an objective study area, we carried out detail analysis of flood risk of the area using GIS data of flood, population distribution and building inventory. Then, using the result of analysis, we discussed the appropriate human evacuation plan of the area. Based on the results obtained, we can conclude that if people use only evacuation centers officially designated by local municipalities, about 70% of them can't evacuate successfully. However, if they use existing tall buildings as evacuation centers, they can all evacuate successfully.[This abstract is not included in the PDF]
    Download PDF (1521K)
  • Shinji TANAKA, Motomune KATAOKA
    2010 Volume 62 Issue 4 Pages 431-434
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    To alleviate traffic congestion in urban area, it is very important to utilize the existing road space efficiently. This study proposed a countermeasure to alleviate traffic congestion at an arterial street in the center of Kochi City. The congestion is caused by an unbalanced lane usage due to right-turn vehicles and on-street parking vehicles, therefore reallocation of the road space and new road geometry are proposed. Analyses of efficiency and safety revealed that the proposal has enough capacity improvement to alleviate the congestion and no dangerous behavior is found in the driving simulator experiment.[This abstract is not included in the PDF]
    Download PDF (704K)
  • Naoki FUJIWARA, Shinji TANAKA, Masao KUWAHARA
    2010 Volume 62 Issue 4 Pages 435-438
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    As route choice set affects pedestrian's choice behavior significantly, it is very important problem to generate their route choice set. This study analyzed GPS data from mobile phone and estimated choice set using some network indices. The interval of the GPS log data from mobile phone is relatively long, so a map-matching method to cover it is developed. Then link sets of route choice were estimated employing indices such as diversion rate or integration value, which took a certain similar value regardless of the network density.[This abstract is not included in the PDF]
    Download PDF (908K)
  • Akiko TAKADACHI, Mikio KOSHIHARA
    2010 Volume 62 Issue 4 Pages 439-443
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    Rammed earth, “HANCHIKU”, is a traditional construction method in Japan. A rammed earth wall has been damaged by earthquake, especially by out-of plane bending force. A seismic performance of rammed earth wall in the out-of plane direction is made clear in this paper. Bending failure and rocking failure can be estimated using the tensile strength of soil. Reinforcement using bamboos and resin fibers was proposed and its work was verified using half model shaking table tests.[This abstract is not included in the PDF]
    Download PDF (1022K)
  • Takahiro ENDO, Haruo SAWADA
    2010 Volume 62 Issue 4 Pages 445-448
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    Until now, there was no way to evaluate the accuracy of a DEM (Digital Elevation Model) under forest created by LiDAR (Light Detection and Ranging) measurement. We developed a LiDAR simulation system for forest which can create three-dimensional tree polygons modified by forest management such as pruning in 3DCG software and simulate point clouds based on its reflectance derived from spectral characteristics at wavelength of laser beam. By applying this system, evaluation of the accuracy of DEM creation is possible before conducting real LiDAR measurement.[This abstract is not included in the PDF]
    Download PDF (739K)
  • Yoshito SAWADA, Haruo SAWADA
    2010 Volume 62 Issue 4 Pages 449-453
    Published: July 01, 2010
    Released: November 25, 2010
    JOURNAL FREE ACCESS
    This paper describes a novel time series modelling and spectrum anomaly-detection method, which takes into consideration wide-area seasonal changes. Since the multi-temporal satellite data are influenced by clouds and system noise, in many cases, they must be processed in order to accurately represent the actual surface conditions. We engineered a discrete time-series model using a self-organizing map (SOM) and a hidden Markov Model (HMM) to reduce the influence of clouds in order to improve the accuracy of the products. In order to identify deforestation trend with 10 days interval, 10-days composite MODIS data were processed. MODIS data were obtained from WebMODIS system. The result shows to identify deforestation trend with pixel by pixel. Our method is able to clearly distinguish spectral anomaly and phenological changes. Our method is found effective to identify land cover changes (i.e. forest fire and deforestation) with pixel by pixel, but further study will be required to clarify its limitation on areas of land cover changes.[This abstract is not included in the PDF]
    Download PDF (817K)
feedback
Top