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CLC number: TP13

On-line Access: 2016-04-05

Received: 2015-09-21

Revision Accepted: 2016-01-05

Crosschecked: 2016-03-09

Cited: 3

Clicked: 2032

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Friederike Wall

http://orcid.org/0000-0001-8001-8558

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Frontiers of Information Technology & Electronic Engineering  2016 Vol.17 No.4 P.283-295

http://doi.org/10.1631/FITEE.1500306


Organizational dynamics in adaptive distributed search processes: effects on performance and the role of complexity


Author(s):  Friederike Wall

Affiliation(s):  Department of Controlling and Strategic Management, Alpen-Adria-Universitaet Klagenfurt, 9020 Klagenfurt, Austria

Corresponding email(s):   friederike.wall@aau.at

Key Words:  Agent-based simulation, Complexity, Coordination, Distributed search, NK landscapes


Friederike Wall. Organizational dynamics in adaptive distributed search processes: effects on performance and the role of complexity[J]. Frontiers of Information Technology & Electronic Engineering, 2016, 17(4): 283-295.

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Abstract: 
In this paper, the effects of altering the organizational setting of distributed adaptive search processes in the course of search are investigated. We put particular emphasis on the complexity of interactions between partial search problems assigned to search agents. Employing an agent-based simulation based on the framework of NK landscapes we analyze different temporal change modes of the organizational set-up. The organizational properties under change include, for example, the coordination mechanisms among search agents. Results suggest that inducing organizational dynamics has the potential to increase the effectiveness of distributed adaptive search processes with respect to various performance measures like the final performance achieved at the end of the search, the chance to find the optimal solution of the search problem, or the average performance per period achieved during the search process. However, results also indicate that the mode of temporal change in conjunction with the complexity of the search problem considerably affects the order of magnitude of these beneficial effects. In particular, results suggest that organizational dynamics induces a shift towards more exploration, i.e., discovery of new areas in the fitness landscape, and less exploitation, i.e., stepwise improvement.

This paper analyzes the effects of organizational dynamics and discusses cross-agent complexity of interactions. It is well structured and the interpretation for demonstrated figures is convincing.

自适应分布式搜索过程中的组织变化及问题复杂度对性能的影响

目的:研究组织设置变更对分布式自适应搜索过程的影响,特别关注局部搜索间的交互复杂度。
创新点:基于分布式多智能体的仿真分析了组织设置的不同模式变化对于不同复杂度的搜索问题的影响。
方法:首先介绍了所采用的智能体仿真模型,描述了构建在NK适应度曲面上的分布式搜索问题及其复杂度。接着阐述了组织设置包括搜索智能体和核心智能体的设置、搜索智能体的视角形成、不同搜索智能体之间的协调以及搜索多样性等。然后给出组织动态性的数学描述,并进行了实验分析:(1)比较了组织变化对子问题交互复杂度最大和最小两种极端搜索问题的影响(称之为“基准”);(2)分析最终和平均优化性能对搜索问题复杂度的敏感性;(3)分析交叉智能体交互复杂度对性能影响的不稳定性。
结论:本文的研究表明组织动态变化能够增加分布式自适应搜索的有效性,比如提高最终性能表现、增加获取最优解的可能性以及发现新的解域等。这种有效性增加幅度很大程度上取决于组织变化模式以及问题的复杂度。

关键词:基于智能体的仿真;复杂度;协调;分布式搜索;NK曲面

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