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Nakayasu, Akio*; Doke, Ryosuke*; Niizato, Tadafumi; Urabe, Atsushi*; Ono, Eisuke*
Joho Chishitsu, 25(4), p.189 - 203, 2014/12
Various uncertainties exist in the data using in the research of geomorphology and geology. When the development process of the geological environment is restored using the data with these uncertainties, the result of the model or simulation inevitably includes uncertainties derived from the uncertainties of data. Especially, in the geological environment model dealing with chronological change of the site (Site Evolution Model) which consists from various kinds of data, the quality assessment/control in each data is important. In this study, the factors of the uncertainties occurred in the process of data acquisition for the estimation of uplift rate, which is one of the data for drawing the topographic evolution, are analyzed by using Evidential Support Logic (ESL). The result of this study is assumed to be used as a tool for extracting the factor of uncertainties in the planning of the investigation, and for controlling the quality of results in the implementation of the investigation.
Niizato, Tadafumi; Yasue, Kenichi; Doke, Ryosuke*; Nakayasu, Akio*
Joho Chishitsu, 25(1), p.3 - 20, 2014/00
An expert obtain, handle, and analyze the multi-disciplinary and huge amount of geoscientific data by applying of the technical knowledge obtained through the long experience in the field of a geoscientific investigation, but technical know-how and decision-making processes in the work processes are almost implicit (tacit knowledge). To promote the sharing and inheriting of the knowledge down to the generations, the knowledge has to be externalized in a useful form. In this study, decision processes and technical know-how on an estimation of uplift rate by using a marine terrace have been clarified by the application of a knowledge engineering approach. Investigations and analyses for the estimation of uplift rate are classified into 8 units of task. A sequence of the task from extraction of pre-existing information to calculation of uplift rate has been illustrated as a task flow. The decision processes in each task have been illustrated as a flow diagram of decision-making process. The diagram shows input for a decision-making, decision point conducted the decision-making, and task and output resulting from the decision-making. This externalized tacit knowledge will be integrated into the IT-based expert system through the construction of an IF-THEN rule-base.
Hirouchi, Daisuke*; Yasue, Kenichi; Doke, Ryosuke*
Nihon Katsudanso Gakkai 2012-Nendo Shuki Gakujutsu Taikai Koen Yokoshu, p.52 - 53, 2012/11
no abstracts in English
Doke, Ryosuke; Tanikawa, Shinichi; Yasue, Kenichi; Nakayasu, Akio; Niizato, Tadafumi; Umeda, Koji; Tanaka, Takenobu*
Katsudanso Kenkyu, (37), p.1 - 15, 2012/09
Based on the collection and analysis of existing information, we clarified a spatial distribution of started age of present faulting pattern on active fault in Japanese Islands. The number of active faults which started its activities are gradually increased from about 3 Ma, dramatically increased after 1.5 Ma, and peaked at around 0.5 Ma. After 1.5 Ma, active faults which types of activity or trends are different from previously started active faults are developed. Therefore, there are plural types of active faults in the present tectonic field in Japan. After the peak around 0.5 Ma, newly developed active faults are decreased. It is possibly that newly developed active faults are undetectable; therefore, it is needed to develop new technics for detecting and assessing non-distinguishing active faults.
Doke, Ryosuke; Yasue, Kenichi; Nakayasu, Akio; Niizato, Tadafumi; Tanikawa, Shinichi; Tanaka, Takenobu*; Aoki, Michinori*; Sekiya, Ayako*
JAEA-Research 2011-031, 109 Pages, 2011/12
JAEA-Research-2011-031.pdf:7.23MB
In this study, existing information related to methods for the estimation of the beginning age of the faulting in the present faulting pattern on the active fault were collected and reviewed. A principle of method, noticing points and technical know-hows in the application of the methods, data uncertainty, and so on were extracted from the existing information. Based on these extracted information, task-flows indicating working process on the estimation of the beginning age for the faulting of the active fault were illustrated on each method. Additionally, the distribution map of the beginning age with accuracy of faulting in the present faulting pattern on the active fault was illustrated.
Yasue, Kenichi; Asamori, Koichi; Tanikawa, Shinichi; Yamada, Kunimi; Yamasaki, Seiko; Kokubu, Yoko; Niwa, Masakazu; Doke, Ryosuke; Kusano, Tomohiro; Hanamuro, Takahiro; et al.
JAEA-Research 2011-023, 113 Pages, 2011/10
JAEA-Research-2011-023.pdf:10.9MB
This annual report documents the progress of R&D in the first fiscal year during the JAEA 2nd Midterm Plan (FY 2010 - 2014) to provide the scientific base for assessing geosphere stability for long-term isolation of the high-level radioactive waste. The planed framework is structured into the following categories: (1) development and systematization of investigation techniques for selecting suitable sites in geosphere stability, (2) development, application and verification of prediction models for evaluating the changes of geological environment in thermal, hydraulic, mechanical and geochemical conditions for a long period of time, and (3) development of new dating techniques for providing information about geologic history and the timing of geologic events. In this paper, the current status of R&D activities with previous scientific and technological progress is summarized.
Doke, Ryosuke; Yasue, Kenichi; Niizato, Tadafumi; Nakayasu, Akio
Proceedings of 14th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2011) (CD-ROM), p.1467 - 1476, 2011/09
Palaeo-hydrogeological information based on reconstructing topographical evolution for disposal sites is considered to be available to build a predictive repository safety assessment. However, the construction of the topographical evolution models has a complicated and tacit working process. Additionally, in the investigation and modeling of topographical evolution for site characterization, it is important to make available the technical know-how (e.g., decision-making process) accumulated over decades of research and development and to transfer the knowledge during initiation and implementation phase. The aim of this study is to externalize the technical know-how for the construction of the topographical evolution models. The working process of the model construction is illustrated as a "task-flow" including the tasks of setting of time scale, extraction of information, construction of conceptual model and construction of numerical model. In each task, explanations with the information of input and output data are described in detail. The linkages with other task-flows, such as the investigations and other modeling, were also described in the task-flow. Additionally, the decision-making processes in the investigations are expressed as IF-THEN format in flow-diagrams for each task. Accordingly, IT-based expert systems including the externalized technical know-how are constructed to support planning and implementation of the investigations and modeling for topographical evolution.
Saegusa, Hiromitsu; Niizato, Tadafumi; Yasue, Kenichi; Onoe, Hironori; Doke, Ryosuke
Proceedings of 14th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2011) (CD-ROM), p.1451 - 1460, 2011/09
The site descriptive modeling, which includes modeling of geological characteristics at present and modeling of site evolution, is used for synthesis of investigation results. It is important to evaluate uncertainties in the model, to specify issues regarding the uncertainties, and to prioritize the specified issues, for the planning of site characterization. The aim of this study is to support for the planning of initial surface-based site characterization based on the technical know-how accumulated from the JAEA's Underground Research Laboratory Projects. In this study, comprehensive task flow from pre-existing data acquisition to site characterization planning through the modeling has been specified. Specific task flow and decision-making process to perform the tasks have been specified, and decision points have also been identified.
Nakayasu, Akio; Niizato, Tadafumi; Yasue, Kenichi; Doke, Ryosuke; Shigehiro, Michiko*; Tanaka, Takenobu*; Aoki, Michinori*; Sekiya, Ayako*
JAEA-Research 2010-056, 116 Pages, 2011/02
JAEA-Research-2010-056.pdf:28.28MB
The investigation methods for characterizing natural events and processes in a coastal field have been extracted on the basis of analysis of previous research. Collected information is classified into three groups according to characteristics of natural events/processes and investigation methods. First group is the methods for evaluation of uplift, subsidence and sedimentation rates. Second group is the methods for evaluation ob denudation rates. The third group is the methods for reconstruction of the climatic and sea-level changes. Based on an analysis of the above information, investigation method that can be applied to a coastal region was extracted. The methods and indices are as follows: (1) Uplift rate: the heights of marine terraces are the most important index in an upheaval region. (2) Subsidence and sedimentation rate: the depths of strata underlying an alluvial plain are main indices in a subsidence region. (3) Denudation rate: the features of marine terrace are main indices and the inspection of denudation processes by the use of a numerical simulation is necessary. (4) Climate change: lacustrine deposits are main object for investigation. (5) Sea-level change: reconstruction of relative sea-level change curve including uplift/subsidence factor and paleography based on acoustic exploration and the investigation of marine terraces.
Doke, Ryosuke*; Takeuchi, Akira*
Geodynamics of Atotsugawa Fault System, p.11 - 16, 2007/00
no abstracts in English
Takeuchi, Akira*; Takebe, Akimitsu*; Ongirad, H.*; Doke, Ryosuke*
Geodynamics of Atotsugawa Fault System, p.1 - 10, 2007/00
no abstracts in English
Ishimaru, Tsuneari; Kokubu, Yoko; Matsubara, Akihiro; Yasue, Kenichi; Doke, Ryosuke; Nishizawa, Akimitsu*; Owaki, Yoshio*; Nishio, Tomohiro*
no journal, ,
The Japan Atomic Energy Agency (JAEA) installed the JAEA-AMS-TONO system in 1997 at Tono Geoscience Center. The system has routinely been used for 
C-AMS and has been developed for use in 
Be-AMS. Under the common-use facility program of JAEA, the system has also been available and used by researchers from universities and other institutes. In this presentation, we report current status of the system and the application studies. In fiscal year 2010, machine time for the Be-AMS was increased because we kicked into gear to technology development of the Be-AMS. For the C-AMS, 520 samples were measured and 87 of the samples were measured upon requests of 4 studies under the common-use facility program. The JAEA applied this C-AMS to geochronological studies such as estimation of sedimentation rate of soil and of retention time of ground water for research and development related to the geological disposal of high-level radioactive waste.
Nakayasu, Akio; Doke, Ryosuke; Urabe, Atsushi*; Ono, Eisuke*; Niizato, Tadafumi
no journal, ,
In this study, the factors of the uncertainties occurred in the process of data acquisition for the estimation of uplift rate, which is one of the data for drawing the topographic evolution, are analyzed by using Evidential Support Logic (ESL). The result of this study is assumed to be used as a tool for extracting the factor of uncertainties in the planning of the investigation, and for controlling the quality of results in the implementation of the investigation.
Yasue, Kenichi; Doke, Ryosuke*
no journal, ,
The developing process of the active fault system is useful for estimating the crystal deformation during the last few million years. This study clarified the spatial and temporal evolution of faulting in the Atera fault belt in the west-central Japan (WCJ) from the both viewpoints of geomorphology and geology. On the basis of a started ate of present faulting style, the evolution of faulting in the belt suggests northwestward shift of activated fault domain during the last few million years. In addition, we discussed the started age of present faulting style of other active faults in the WCJ by the same method as the Atera fault belt. As a result, active fault belts in the northern part tend to be younger than fault belts in the southern part.
Yasue, Kenichi; Doke, Ryosuke; Niwa, Masakazu; Tanikawa, Shinichi; Nakayasu, Akio; Niizato, Tadafumi; Asamori, Koichi; Ishimaru, Tsuneari; Umeda, Koji
no journal, ,
A started age of present faulting pattern is meaningful to suggest the beginning of neotectonic regime such as evolution stages of mountains. The onset times of faulting in the Japanese Islands are estimated using previous study data. We used a calculation method which is the total displacement subdivided by the slip rate. We also used information of the strata indicating the appearance of the faulting. The main results are shown as follows : (1) In northeast Japan, reverse faulting in the N-S direction started since about 3 million years ago. (2) In southwest Japan, the onset times of faulting are estimated in the Kinki district and the northern part of the Izu peninsula, which are younger than those in other regions. (3) There appear to be many active faults in the Niigata-Kobe Tectonic Zone which started since about 1 million years ago.
Niizato, Tadafumi; Doke, Ryosuke; Yasue, Kenichi; Nakayasu, Akio
no journal, ,
To support both the implementer and the relevant regulatory organization, the knowledge used in a geoscientific investigation related to the geological disposal has to be externalized in a useful form. In this study, decision processes and technical know-how on a construction of topographic and geological evolution models have been clarified by the application of a knowledge engineering approach. Investigations and analyses for the estimation of uplift rate are classified into 4 units of "task". A sequence of the task from "setting up time frame" to "construction of numerical model" has been illustrated as a "task flow". The decision processes in each task have been illustrated as a "flow diagram of decision process". The diagram shows input for a decision, decision point, and task and output resulting from the decision-making. This externalized tacit knowledge will be integrated into the IT-based expert system through the construction of an IF-THEN rule-base.
Nakayasu, Akio; Doke, Ryosuke; Yasue, Kenichi; Niizato, Tadafumi; Umeda, Koji; Osawa, Hideaki
no journal, ,
no abstracts in English
Doke, Ryosuke; Yasue, Kenichi; Nakayasu, Akio; Niizato, Tadafumi; Tanaka, Takenobu*
no journal, ,
no abstracts in English
Osawa, Hideaki; Doke, Ryosuke; Yasue, Kenichi; Niizato, Tadafumi; Nakayasu, Akio; Umeda, Koji
no journal, ,
Decision process and technical know-how on an estimation of uplift rate by using fluvial terraces as indicator, one of the researches on the long-term stability of the geological environments conducted by JAEA, have been clarified for expert system of "Information Synthesis and Interpretation System (ISIS)". A sequence of the research from "extraction of pre-existing information" to "calculation of uplift rates" and decision processes during the investigation and analysis have been illustrated as the "task flow" and "flow diagram of decision process", respectively. These "tacit knowledge" externalized by application of knowledge engineering methods have been integrated into the expert system of ISIS through the construction of IF-THEN rule-base.
Doke, Ryosuke; Yasue, Kenichi; Niizato, Tadafumi; Nakayasu, Akio
no journal, ,
Tacit knowledge within an expert on the research on estimation of an uplift rate by using fluvial terrace as indicator was externalized by the knowledge engineering method. Sequences of the research and decision process during the investigation have been externalized as the "task flow" and "flow diagram of decision process", respectively, and the knowledge has been integrated into the expert system.
