著者
石川 昌明
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.30, no.4, pp.115-121, 2017-04-15 (Released:2017-07-15)
参考文献数
12
被引用文献数
1 1

The purpose of this paper is to propose the stochastic infectious model with time delay and to study the stability of the disease-free steady state. In the realistic spread of the infectious disease, environmental change and individual difference cause some kinds of random fluctuations in the model parameters. Moreover, in the vector-borne diseases such as malaria and dengue fever, there exists time delay caused by an incubation period in the virus development in the vectors (mosquitoes) on the transmission of disease. Taking these facts into consideration, we propose a stochastic SIR(susceptible-infected-recovered) model with time delay. We analyze stability of the disease-free steady state, and study the influence of time delay and the random noise on the stability by numerical simulations.
著者
小野崎 香織 吉村 浩明
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.27, no.4, pp.160-165, 2014-04-15 (Released:2014-07-15)
参考文献数
11

For the design of spacecraft transfer orbits in the Earth-Moon system, we need to model the dynamics in the context of the Planar Elliptic Restricted Three-Body Problem (PER3BP) since it has a non-negligible eccentricity. In this paper, we investigate invariant manifolds of the PER3BP by analyzing Lagrangian Coherent Structures (LCS). In particular, we show that the transfer orbits from the exterior realm to Moon can be developed by employing the geometric characteristics of the LCS obtained by long time numerical integrations.
著者
津田 侑 上原 哲太郎 森村 吉貴 森 幹彦 喜多 一
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.28, no.10, pp.407-418, 2015-10-15 (Released:2016-01-19)
参考文献数
18

Consumer-generated medias (CGMs) such as weblogs, online social networks and photo-sharing services getting to be mainstream internet services. On CGMs, users generate and publish various content, and other users review them. Internet live-broadcasting (ILB) services attract attention as a novel type of CGM services for broadcasting movie and voice in real time. And wide variety of content are circulated on ILB. Evolutional CGMs have emergent nature among users. From viewpoint, the paper analyzes users' psychological factors and their behaviors on the ILBs.The authors conducted a web-based survey, and ethnographical study of two users.As the result,the authors found that the users prefer to use real-time communication tools on internet live broadcasting services which have real-time content.In addition,though broadcasters desire to be viewed by the general public,they choose several styles for advertisements of their broadcasting.
著者
石西 正幸 市川 学 田沼 英樹 出口 弘 金谷 泰宏
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.27, no.7, pp.319-325, 2014-07-15 (Released:2014-10-15)
参考文献数
13
被引用文献数
1

This paper aims to propose a risk assessment method on countermeasure against infectious disease with high fatality rate using social simulation. We constructed a novel model which are able to visualize social vulnerability against outbreak of infectious disease such as smallpox. In this model, disease state transition of smallpox, infection process, social structure, human activity, social countermeasure, simulation condition that include parameters, and simulation results are described. We evaluate the social protection policies by an agent-based model using Spot Oriented Agent Role Simulator (SOARS). This model is able to visualize the risk of social vulnerability against smallpox and social vulnerability is different among generations.
著者
小木曽 公尚 平田 研二
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.26, no.5, pp.156-164, 2013-05-15
参考文献数
21

This paper proposes a remote control method for a linear system with pointwise-in-time state and/or control constraints. Our technique guarantees achievement of tracking performance and constraint fulfillment under simultaneous occurrence of some phenomena over communication links, such as arbitrary and unforeseeable delays and lots of packet losses. Our ideas are to feedback information about not a state but a state-existing area and to share maximal output admissible sets with reference governor and switching control strategy that consist of the proposed technique. Through numerical and experimental examples, we demonstrate effectiveness of the proposed method. <br>
著者
鈴木 一正 呉 海元
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.26, no.9, pp.323-329, 2013 (Released:2013-12-15)
参考文献数
19
被引用文献数
1

In this paper, we propose automatic hair detection and tracking system at video-rate by using Kinect to capture color and depth information. Our system has the following three ideas simultaneously: 1) Simple and high-speed system is built by the general technique using distance information. 2) Using a 6D feature vector to describe both the 3D color feature and 3D geometric feature of each pixel uniformly. Classifying pixels in images into foreground (e.g. hair) and background with K-means clustering algorithm. 3) Automatic learning and updating the cluster centers of foreground and background before and during hair tracking. This ability makes our system can track hairs robustly, which does not depend on its hair color and style, and even before a background with similar color of hair. Our system becomes a robust head tracking system if the face and hair are set as foreground.
著者
石川 昌明
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.31, no.4, pp.129-136, 2018-04-15 (Released:2018-07-15)
参考文献数
17

This paper is concerned with the stability analysis of the stochastic infectious model with time delay. In the vector-borne diseases such as malaria and Japanese encephalitis, there exists time delay caused by an incubation period in the virus development in the vectors on the transmission of disease. Moreover, environmental change and individual difference cause some kinds of random fluctuations in the infection, recovery rates, etc. Hence, we propose the stochastic infectious model with time delay. The equilibrium solution with zero infected individuals is called the disease-free steady state. Since the stability of the disease-free steady state is related to whether or not the infectious disease spreads, we analyze stability of the disease-free steady state using the stochastic Lyapunov function. Moreover, we study the influence of the random noise on the stability based on the calculation of the Lyapunov exponent, and show results of numerical simulations.
著者
谷口 忠大 椹木 哲夫
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.18, no.12, pp.440-449, 2005-12-15 (Released:2011-10-13)
参考文献数
28

This paper discusses a relationship between symbol emergence and embodiment. Symbol emergence is an alternative approach to overcome symbol grounding problem. We believe human beings' symbols constructed and held internally are originally based on our own embodiment. Therefore, autonomous social robots will also have to construct their own symbols by themselves. In addition to this, we have a nonlinear hypothesis about symbol emergence. To realize symbol emergence inside of autonomous robots, we propose Dual-Schemata model. This model enables an autonomous robot to generate its own symbols, called perceptional schemata, depending on its embodiment. In the end, we show that this symbol emergence has a nonlinear relationship with embodiment.
著者
高橋 理 駒谷 喜代俊 田村 坦之
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.16, no.7, pp.313-320, 2003-07-15 (Released:2011-10-13)
参考文献数
12

Software engineering organizations now tend to improve their processes according to such standards as CMM (Capability Maturity Model), a process evaluation model, in addition to improving their software products. This is because it is believed that mature engineering processes can bring high-quality products within the original schedule. It is reported, however, that the result of the improvement activities is strongly related with engineer satisfaction for the process, that is, effective improvement can be expected on the phases where engineers have not been satisfied with. This paper proposes a method to evaluate how much engineers feel the current engineering process needs to be improved, with Descriptive AHP (Descriptive Analytic Hierarchy Process), one of decision making tools. Our method, based on the idea that the necessity evaluation can be related with engineers satisfaction, evaluates four engineering phases under six criteria defined at CMM Level 2, determining which phases should be improved first. As a result of having system engineers use this method, we found that quality assurance activities in the manufacturing and examination phases need to be superior for improvement to other phases.
著者
橋本 浩一 則次 俊郎
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.12, no.10, pp.633-638, 1999-10-15
被引用文献数
1 2

Yoyo is a simple toy but it has complicated dynamical characteristics. This paper describes a model of the yoyo suitable for feedback control and a visual feedback control scheme based on this model. The validity of the model and the control scheme is evaluated by the simulations and the experiments on PUMA 560.
著者
村上 晴美 浦 芳伸 片岡 祐輔
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.29, no.2, pp.51-64, 2016-02-15 (Released:2016-05-15)
参考文献数
20

To help users select and understand people while searching for them, we present a method of assigning Nippon Decimal Classification (NDC), which is a system of library classification numbers, to people on the web. By assigning NDC numbers to people, we can assign not only labels to people but also build a NDC-based people-search directory. We use a relative index in NDC, which lists the related index terms attached to NDC. We count the number of relative index terms contained in the titles of web pages (HTML files) and assign the top five NDC9 numbers to people. We developed a prototype of a people-search directory by assigning NDC9 numbers to HTML files that were manually classified from web people-search results. We evaluated the usefulness of our approach by comparing four methods and six documents and found that our method (extracting relative index terms) from the titles of web pages outperformed other methods and documents.
著者
浜田 祐一 周 桑完 宮崎 文夫
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.13, no.12, pp.585-592, 2000-12-15 (Released:2011-10-13)
参考文献数
14
被引用文献数
1 1

Pedaling is a typical example of the problem of man-machine interaction. The design of machines and bicycles that makes full use of human capabilities is an old but still challenging engineering problem. This paper describles the optimal design of a bicycle from several viewpoints such as kinematics, statics, dynamics, and physiology. The efficacy of a new mechanism called “magic crank” that realizes an unconventional non-circular pedaling trajectory is also discussed.
著者
久保田 直行 佐々木 裕宣
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.19, no.3, pp.87-95, 2006-03-15 (Released:2011-10-13)
参考文献数
20

Recently, embodied cognition for robotics has been discussed, and various types of artificial neural networks are applied for behavior learning of robots in unknown and dynamic environments. In this paper, we propose behavioral learning based on a fuzzy spiking neural network to realize high adaptability of a mobile robot. However, the behavioral leaning capability of the robot depends strongly on the network structure. Therefore, we apply a genetic algorithm to acquire the network structure suitable to the changing environment. Finally, we discuss the effectiveness of the proposed method through experimental results on behavioral learning for collision avoidance and target tracing in a dynamic environment.
著者
原 辰次 Toni BAKHTIAR
出版者
一般社団法人 システム制御情報学会
雑誌
システム制御情報学会論文誌 (ISSN:13425668)
巻号頁・発行日
vol.19, no.10, pp.391-399, 2006-10-15 (Released:2011-10-13)
参考文献数
10
被引用文献数
2 4

This paper is concerned with intrinsic control performance limitations achievable by feedback for single-input and multi-output (SIMO) possibley unstable and non-minimum phase linear discrete-time systems. We investigate two typical H2 optimal control problems, namely optimal tracking control problem and minmal energy control problem. We derive closed-form analytical expressions of the best achievable tracking error and minmal energy H2 norms. The former consists of plant gain as well as unstable poles and non-minimum phase zeros of the plant, while the latter is only given by unstable poles and non-minimum phase zeros of the plant. Those results are confirmed by several numerical examples, and they characterize easiness and difficulty of plants to be controlled.