Recovery planning of industrial robots based on semantic information of failures and time-dependent utility

Industrial robots are required to recover from temporary errors and continue operations under a changing environment. In this paper, we propose a recovery planning system that considers the semantic information behind errors during robotic actions. In order to establish general repair strategies for feasible recovery plans under uncertainties, the proposed system uses a conceptual graph based on case grammar and a Bayesian network that is dynamically constructed according to the semantic information. In addition, we tackle the problem that the wealth of the recovery plan depends on the uncertainty of execution costs against the deadline at the production site. The proposed system controls the decision model by using a time-dependent utility. We demonstrate the effectiveness of the proposed system through simulations of assembly tasks by multiple robots.     

浅析全球水危机及水资源可持续利用

水对生活和社会经济发展来说是必不可少的。但是不断紧缺的淡水资源,清洁饮用水和卫生条件的缺乏,水质不断恶化,支离破碎的水管理体系,相对较少的资金投入等等,已经使得水资源短缺成为全球性的资源危机,进而影响到世界和平和安全,而且这个趋势正越发明显。本文主要列举了目前存在的水危机问题,同时提出应建立维持水资源可持续利用行动纲领的建议,包括行动纲领应包括的主要内容。     

边缘营造的高层建筑设计探索--河南高速公路联网中心设计

本文以高速公路联网中心设计项目为例，从职能与事件，提取、切片与并置，异质并列三个方面，探讨高层建筑设计的新理念，以及从事件特征，行为过程，环境质量入手的设计方法。     

纸质地图的作用及对策研究

纸质地图作为人们出行的助手,受到电子地图越来越多的冲击,有人质疑纸质地图即将被电子地图所取代。本文结合纸质地图和电子地图的优劣对比,阐述了纸质地图在现代社会生活中应该发挥的作用,强调了其在辅助出行、普及地理知识、军事价值、专题图应用和文史价值方面的意义。同时结合工作实践重点介绍了纸质地图面临冲击所采取的应对措施。     

润滑油自由基捕捉剂型抗氧剂作用机理研究

酚型抗氧剂和胺型抗氧剂作为自由基捕捉剂型抗氧剂,已被广泛地应用于各类润滑油中。分析研究了自由基捕捉剂型抗氧剂的作用机理,对于有效地改善润滑油的氧化安定性能、延长润滑油的使用寿命以及研制新型润滑油抗氧剂具有重要意义。     

融合LBP特征和运动特征的运动分类算法

本文提出了一种局部二值模式(Local Binary Pattern,LBP)特征和运动特征相融合的运动分类算法。首先,利用背景差分法检出视频中的运动人体序列,将运动人体序列经过LBP算子处理得到LBP直方图特征。然后,将LBP直方图特征和运动人体质心的速度特征相融合作为运动人体行为分析的识别特征,应用BP神经网络进行行为分类识别。在Weizmann和KTH行为数据库上进行了算法实验研究,人体行为识别的平均准确率达到了90.78%。实验结果表明:该方法在识别率方面明显优于常规方法进行识别的结果。     

A step-by-step performance assessment and improvement method for ERP implementation: Action case studies in Chinese companies

The implementation of enterprise resource planning (ERP) is a complex process, and the failure rate remains very high. The literature has reported over 80 critical success factors for ERP implementation, but companies typically do not know to exploit them. In this article, a step-by-step assessment and improvement method for ERP implementation is proposed and applied in three companies. First, a five-stage ERP implementation model is proposed. Second, about 80 critical success factors (CSFs) from the literature are elaborated into key performance indices (KPIs), which are associated with each stage of ERP implementation by ten local ERP experts. Third, the weights of the KPIs are calculated using the Dumpster–Shafer method and the evaluation of ten experts. During the implementation process, performance is measured at each stage and remedial actions are identified if the performance is below expectation. An implementation flowchart is developed based on a five-stage model and the philosophy of continuous improvement. Three action cases in Chinese manufacturing companies are conducted to illustrate the effects of the assessment model, which is also currently being used by a consulting company specialising in ERP implementation. With further evaluation by local experts, the model has the potential to serve as a guideline for ERP implementation in other countries.     

The Identification Problem for a Mixture of Observations from Two Normal Populations

A comparative study is made of the performances of various procedures for identifying the population of origin of each observation in a sample made up of observations from two normal populations, the parameters of which may or may not be known.     

Nongenotoxic Mechanisms Involved in Bromate-Induced Cancer in Rats

Risk assessments for bromate (BrO₃-) in drinking water are based on linear extrapolation from the total incidence of tumors in male rats. The only genotoxic effects that might result from carcinogenic doses of BrO₃- in vivo are the formation of 8-oxodeoxyguanosine (8-oxoG) in deoxyribonucleic acid (DNA) and the production of micronuclei. The mutations in tumors are consistent with the 8-oxoG adduct, and both effects are nonlinear with respect to dose. Treatment of rats with BrO₃- resulted in bromination of protein tyrosines. The accumulation of these proteins in the kidney appeared to contribute to kidney cancer in male, but not female, rats. BrO₃- increased the rate of apoptosis (programmed cell death) in the kidneys of rats of both sexes, an effect associated with increasing expression of antiapoptotic genes and proteins. Consequently, suppression of apoptosis is a likely mechanism for BrO₃- induced kidney cancer. More limited data suggest nongenotoxic modes of action for thyroid tumors and mesotheliomas. If these data are confirmed, linear extrapolation of risk to low doses is inappropriate.