All issues
Volume 27, Issue 7
Displaying 1-7 of 7 articles from this issue
- |<
- <
- 1
- >
- >|
Papers
-
Manabu Ichikawa, Yusho Kasuga, Hiroshi Deguchi, Yasuhiro Kanatani2014 Volume 27 Issue 7 Pages 259-267
Published: July 15, 2014
Released on J-STAGE: October 15, 2014
JOURNAL FREE ACCESSThe current Japanese night-time emergency health care system can no longer satisfy patients' demand due to the patient's changing consultation behavior and the doctor's uneven distribution. In order to understand the current situation of the night-time emergency health care in Japan, we propose a model to simulate the whole process of the night-time emergency health care system, including the patient's consultation behavior process, the patient's transportation process, and the negotiation process between a medical institute and an ambulance. We apply the agent-based modeling (ABM) approach to take into account the decision-making process of the patient, the medical institution, and the re services department. We validate the model according to the actual patients' ambulance transportation time in the real situation. Especially, this model allows us to evaluate the proposed plan for improving the current daily rotation system of the Japanese night-time emergency health care system. As a result, we find that the proposed new daily rotation system will improve the medical services without raising the burden of the medical institute.View full abstractDownload PDF (1638K) -
Aki-Hiro Sato, Maito Takagi, Tsuyoshi Nagahiro2014 Volume 27 Issue 7 Pages 268-278
Published: July 15, 2014
Released on J-STAGE: October 15, 2014
JOURNAL FREE ACCESSThis paper proposes decentralized energy management system (DEMS) consisting of center and sensor nodes. The center node has an ability to control sensor nodes which contain sensors and controllers of electricity. We show data on electrical power consumption of Osaka Prefectural Government Sakishima Building (Cosmo tower) located at Osaka Sakishima District. We prototyped a center node and sensor nodes and measure temperature and light strength in Asia Trade Center Building located at Osaka Sakishima District. We propose an indicator of human theremal demand using temperature and light strength measured by the prototype system.View full abstractDownload PDF (2055K) -
Junya Fukuta, Hajime Kita2014 Volume 27 Issue 7 Pages 279-289
Published: July 15, 2014
Released on J-STAGE: October 15, 2014
JOURNAL FREE ACCESSIn agent-based simulation using actual social statistics, attributes of all the agents have to been decided to meet the statistics. However, they can’t be decided uniquely because statistics gives only limited number of aggregated values. To this problem, Hara et al. have proposed a method of formulating the problem as a constrained optimization problem, and solving it using simulated annealing. They applied it to estimation of future population. However, they didn’t carry out evaluation of computational performance of their model. In this paper, the authors improved implementation of their model to enhance computational performance, discuss convergence of the optimization process and evaluate computational load of their method. Estimation results are compared with an estimation using conventional cohort-component method.View full abstractDownload PDF (2585K) -
Yusuke Goto, Akihiro Sugimoto, Yosuke Takizawa, Shingo Takahashi2014 Volume 27 Issue 7 Pages 290-298
Published: July 15, 2014
Released on J-STAGE: October 15, 2014
JOURNAL FREE ACCESSStakeholders of a complex agent-based model (ABM) need to understand and accredit the ABM, that contains the results of scenario analysis provided by ABM analysts, when we design management systems in an organization with social simulation. There are two problems for understanding and accrediting complex ABMs: (1) The results described by complex micro–macro dynamics often hinder the stakeholders from understanding the results by reading analysts’documents; (2) Most stakeholders adhere to find a difference between the reality itself and the ABM that consists of essential factors. We proposed a methodology that facilitates stakeholders to understand an ABM by playing a card game with adequate similarities to the ABM, and we confirmed whether the methodology can generate effective card games by having four preliminary experiments.View full abstractDownload PDF (1477K) -
Takashi Yamada, Takao Terano2014 Volume 27 Issue 7 Pages 299-308
Published: July 15, 2014
Released on J-STAGE: October 15, 2014
JOURNAL FREE ACCESSThis study investigates what kind of dynamics players lead to in Barrow’s “do-it-yourself lottery” by agent-based computational economics approach. The lottery is such that players choose a positive integer which is expected to be the smallest but anyone else does not choose. For this purpose, we consider a simple game form in which players know the preceding result, not plays of others, for their decision making and then pursue computer simulations by changing the number of players and the upper limit. Our main finding is threefold: First, both the distributions of submitted and winning integer are different from those in steady states when the value of sensitivity paramenter is small. Second, game efficiencies are higher than those in theory. Besides, in contrast to the theory, as the value of sensitivity parameter becomes larger, they rise. Third, there is a tendency of splitting the players into a winner and the losers.View full abstractDownload PDF (1042K) -
Nisuo Du, Tadahiko Murata2014 Volume 27 Issue 7 Pages 309-318
Published: July 15, 2014
Released on J-STAGE: October 15, 2014
JOURNAL FREE ACCESSIn this paper, we examine signals in a market where asymmetric information is only available between sellers and buyers by agent-simulations to avoid the quality deterioration in a market. Our analysis and simulations show that the quality deterioration can be avoided when sellers employ a quality-related signals whose cost depends on their quality rate, and when the cost of goods, the amount of goods, and the cost of signals are appropriately determined. Besides, we show the reason why sudden fluctuations of good quality occur in a market with quality-related signals through our computer simulation.View full abstractDownload PDF (1386K) -
Masayuki Ishinishi, Manabu Ichikawa, Hideki Tanuma, Hiroshi Deguchi, Y ...2014 Volume 27 Issue 7 Pages 319-325
Published: July 15, 2014
Released on J-STAGE: October 15, 2014
JOURNAL FREE ACCESSThis 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.View full abstractDownload PDF (1548K)
- |<
- <
- 1
- >
- >|