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RISS 인기검색어
- 검색키워드
- 저자 : Rokugawa Shuichi (검색결과 6 건)
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Information Sharing and Security for a Memory Channel Communication Network
Takaaki Kawanaka,Shuichi Rokugawa,Hiroshi Yamashita 대한산업공학회 2018 Industrial Engineeering & Management Systems Vol.17 No.3
In this study, the authors propose a model describing information sharing and information security measures in an organization using a memory channel communication network (CN). First, the authors highlight communication between the inner members of an organization and communication between inner and outer members, realizing a model describing intra-organizational information sharing and external information leakage. Utilizing this model, the authors determine the percentage of advanced information allocated to inner members most efficient for the organization from the viewpoint of information sharing and information security measures. Then, the allocation percentage is determined considering the structure of the CN and the characteristics of its members. The authors use simple numerical examples in order to confirm whether the model in this study truly represents communication in a real organization. The results confirm that the model is reality-based.
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Early-stage Project Outcome Prediction Considering Human Factors
Satoshi Urata,Takaaki Kawanaka,Shuichi Rokugawa 대한산업공학회 2022 Industrial Engineeering & Management Systems Vol.21 No.1
In the early stages of a project, project managers need a way to connect concrete actions to the factors that affect project success. This study aims to upgrade project management methodology by using machine learning technologies to predict project results. Using a new deep learning model called “deep tensor,” we predict project results at the time of completion—including quality, cost, and delivery time—by evaluating the project’s state in its earliest stage using various types of project knowledge assets. The prediction results suggest that the predictive accuracy of the deep tensor model is more accurate than that of the random forest or multiple regression model. The way to use this model to recommend specific advice by using the factors that most influenced the model’s predictions is also presented. This research provides a method for sharing difficult-to-share knowledge across projects and will be useful for early, tangible improvement measures in the project execution phase.
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부분 동결된 소금물에서의 초음파감쇠에 대한 다공성탄성 모델
( Jun Matsushima ),( Takao Nibe ),( Makoto Suzuki ),( Yoshibumi Kato ),( Shuichi Rokugawa ) 한국지구물리·물리탐사학회 2011 지구물리와 물리탐사 Vol.14 No.1
유체를 포함하는 혼합 매질에서의 탄성파 고유 감쇠에 대한 다양한 메커니즘 중, 탄성파 전파 시 고체와 유체 사이에서의 상대적 운동은 가장 중요한 감쇠 메커니즘 중의 하나이다. 선행 연구에서는 얼음의 미세 공극 안에 존재하는 소금물이 초음파의 전파에 미치는 영향을 분석하기 위하여 얼음과 소금물이 공존하는 매질에서 초음파 전파 실험하였다. 부분적으로 동결된 소금물에서 각기 다른 온도에서의 초음파 감쇠의 물리적인 메커니즘을 350~600 kHz의 주파수 대역에서 규명하기 위하여, Biot 이론에 입각한 다공성의 탄성 모델을 도입하여 초음파의 전파를 측정하였다. 고체상은 얼음으로, 액체상은 소금물로 가정한 뒤 펄스 핵자기공명기술로 측정한 유체의 성질을 이용하여 각각의 온도에서의 공극률을 계산한 결과, 실험으로 측정한 감쇠값은 500 kHz에서 계산된 고유 감쇠값과 다르게 나타났으며 이는 squirt-flow 메커니즘과 파의 산란 효과와 같은 다른 감쇠 메커니즘도 고려해야 한다는 것을 의미한다. Although there are many possible mechanisms for the intrinsic seismic attenuation in composite materials that include fluids, relative motion between solids and fluids during seismic wave propagation is one of the most important attenuation mechanisms. In our previous study, we conducted ultrasonic wave transmission measurements on an ice-brine coexisting system to examine the influence on ultrasonic waves of the unfrozen brine in the pore microstructure of ice. In order to elucidate the physical mechanism responsible for ultrasonic wave attenuation in the frequency range of 350-600 kHz, measured at different temperatures in partially frozen brines, we employed a poroelastic model based on the Biot theory to describe the propagation of ultrasonic waves through partially frozen brines. By assuming that the solid phase is ice and the liquid phase is the unfrozen brine, fluid properties measured by a pulsed nuclear magnetic resonance technique were used to calculate porosities at different temperatures. The computed intrinsic attenuation at 500 kHz cannot completely predict the measured attenuation results from the experimental study in an ice-brine coexisting system, which suggests that other attenuation mechanisms such as the squirt-flow mechanism and wave scattering effect should be taken into account.
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A poroelastic model for ultrasonic wave attenuation in partially frozen brines
Matsushima, Jun,Nibe, Takao,Suzuki, Makoto,Kato, Yoshibumi,Rokugawa, Shuichi Korean Society of Earth and Exploration Geophysici 2011 지구물리와 물리탐사 Vol.14 No.1
유체를 포함하는 혼합 매질에서의 탄성파 고유 감쇠에 대한 다양한 메커니즘 중, 탄성파 전파 시 고체와 유체 사이에서의 상대적 운동은 가장 중요한 감쇠 메커니즘 중의 하나이다. 선행 연구에서는 얼음의 미세 공극 안에 존재하는 소금물이 초음파의 전파에 미치는 영향을 분석하기 위하여 얼음과 소금물이 공존하는 매질에서 초음파 전파 실험하였다. 부분적으로 동결된 소금물에서 각기 다른 온도에서의 초음파 감쇠의 물리적인 메커니즘을 350 ~ 600 kHz의 주파수 대역에서 규명하기 위하여, Biot 이론에 입각한 다공성의 탄생 모델을 도입하여 초음파의 전파를 측정하였다. 고체상은 얼음으로, 액체상은 소금물로 가정한 뒤 펄스 핵자기공명기술로 측정한 유체의 성질을 이용하여 각각의 온도에서의 공극률을 계산한 결과, 실험으로 측정한 감쇠값은 500 kHz에서 계산된 고유 감쇠값과 다르게 나타났으며 이는 squirt -flow 메커니즘과 파의 산란 효과와 같은 다른 감쇠 메커니즘도 고려해야 한다는 것을 의미한다.
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Highly efficient CMP surveying with ground-penetrating radar utilising real-time kinematic GPS
Onishi Kyosuke,Yokota Toshiyuki,Maekawa Satoshi,Toshioka Tetsuma,Rokugawa Shuichi Korean Society of Earth and Exploration Geophysici 2005 지구물리와 물리탐사 Vol.8 No.1
The main purpose of this paper is to describe a highly efficient common mid-point (CMP) data acquisition method for ground-penetrating radar (GPR) surveying, which is intended to widen the application of GPR. The most important innovation to increase the efficiency of CMP data acquisition is continuous monitoring of the GPR antenna positions, using a real-time kinematic Global Positioning System (RTK-GPS). Survey time efficiency is improved because the automatic antenna locating system that we propose frees us from the most time-consuming process-deployment of the antenna at specified positions. Numerical experiments predicted that the data density and the CMP fold would be increased by the increased efficiency of data acquisition, which results in improved signal-to-noise ratios in the resulting data. A field experiment confirmed this hypothesis. The proposed method makes GPR surveys using CMP method more practical and popular. Furthermore, the method has the potential to supply detailed groundwater information. This is because we can convert the spatially dense dielectric constant distribution, obtained by using the CMP method we describe, into a dense physical value distribution that is closely related to such groundwater properties as water saturation.
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