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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.
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.
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.
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.
Niizato, Tadafumi; Yasue, Kenichi; Nakayasu, Akio; Shigehiro, Michiko*
no journal, ,
no abstracts in English
Nakayasu, Akio; Yasue, Kenichi; Niizato, Tadafumi; Doke, Ryosuke; Shigehiro, Michiko*
no journal, ,
no abstracts in English
Matsuzaki, Tatsuji; Iwatsuki, Teruki; Nakayasu, Akio; Semba, Takeshi
no journal, ,
no abstracts in English
Iwatsuki, Teruki; Nakayasu, Akio; Hama, Katsuhiro; Mizuno, Takashi
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Expert system for hydrochemical investigations were developed based on knowledge from scientific studies at Mizunami and Horonobe URL. The knowledge on hydrochemical investigation are classified into (1) how to construct the conceptual model during literature survey, (2) planning method on hydrochemical investigation, (3) know-how on hydrochemical investigation, (4) data analysis and modelling, (5) estimation of long-term hydrochemical change.
Nakayasu, Akio; Iwatsuki, Teruki; Tachibana, Shoko*; Yang, H.*
no journal, ,
no abstracts in English
Doke, Ryosuke; Yasue, Kenichi; Niizato, Tadafumi; Nakayasu, Akio; Umeda, Koji; Osawa, Hideaki
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.
Niizato, Tadafumi; Yasue, Kenichi; Doke, Ryosuke; Nakayasu, Akio; Shigehiro, Michiko*
no journal, ,
no abstracts in English
Iwatsuki, Teruki; Hama, Katsuhiro; Nakayasu, Akio; Tachibana, Shoko*; Miyairi, Ryuga*; Yang, H.*
no journal, ,
R&D on geological isolation of high-level radioactive wastes requires accumulation of previous information, model conceptuarization, planning, investigation and modelling analysis for geological environment. This study summarizes the know-hows and expert judgements for the those tasks based on experiences gained at Tono and Horonobe area.
Matsuzaki, Tatsuji; Iwatsuki, Teruki; Nakayasu, Akio; Semba, Takeshi
no journal, ,
no abstracts in English
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.
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.
Matsuzaki, Tatsuji; Iwatsuki, Teruki; Nakayasu, Akio; Takeuchi, Shinji; Semba, Takeshi
no journal, ,
no abstracts in English
Nakayasu, Akio; Doke, Ryosuke; Yasue, Kenichi; Niizato, Tadafumi; Umeda, Koji; Osawa, Hideaki
no journal, ,
no abstracts in English
