An adaptive sampling scheme guided by BART—with an application to predict processor performance

The evaluation of new processor designs is an important issue in electrical and computer engineering. Architects use simulations to evaluate designs and to understand trade‐offs and interactions among design parameters. However, due to the lengthy simulation time and limited resources, it is often practically impossible to simulate a full factorial design space. Effective sampling methods and predictive models are required. In this paper, the authors propose an automated performance predictive approach which employs an adaptive sampling scheme that interactively works with the predictive model to select samples for simulation. These samples are then used to build Bayesian additive regression trees, which in turn are used to predict the whole design space. Both real data analysis and simulation studies show that the method is effective in that, though sampling at very few design points, it generates highly accurate predictions on the unsampled points. Furthermore, the proposed model provides quantitative interpretation tools with which investigators can efficiently tune design parameters in order to improve processor performance. The Canadian Journal of Statistics 38: 136–152; 2010 © 2010 Statistical Society of Canada     

近三十年新疆高校少数民族汉语教学研究述评

文章对1979年以来发表在新疆主要刊物和区外核心刊物中的423篇高校少数民族汉语教学研究论文进行了统计分析。在30年的发展中其成绩主要表现在研究基础不断扩大、研究论题走向广泛与细化、研究方法有一定的改进。而存在的主要缺憾是研究内容不深入、研究方法单一,定量和定性研究重视不够等问题。目前新疆高校少数民族汉语教育虽然有较大发展,但在教学上过度依赖对外汉语教学,在研究层次上仍处于相对较低的水平。     

The mad estimator: when is it non-linear? applications to two-way design models

The mean absolute deviation (MAD) estimator has recently received a great deal of attention as applied to full-rank linear regression models. This paper provides a necessary and sufficient condition for the MAD estimator to be a non-linear estimator, in which case conditions for the variance of the MAD estimator to be larger or smaller than those for OLS are, in general, unknown. The non-linearity of the MAD estimator is examined for several two-way designs; in particular (1) randomized block design (2) two-way nested design (3) two-way classification with interaction and (4) partially balanced incomplete block design     

网络渠道交易价值的实证分析——以L品牌手机淘宝BtoC店为例

以国产手机著名品牌L品牌淘宝BtoC店为例,按入口时搜索的关键词的特点,将来访顾客分成渠道忠诚访客和品牌忠诚访客,连续30天观察总的页面浏览量、2种类型的访客数量、分别带来的成交量,以及每日询盘量。对渠道忠诚顾客带来的成交占总成交的比例进行均值估计,得知其比例为38.3%;对2类访客与相应的成交量分别作回归分析,结论均为有显著影响。文章在此基础上对提高网店价值,提出了相应的建议。     

The TRIPs agreement and technological innovation

In this paper we attempt to evaluate the possible spill-over of the international agreement on Trade-Related Aspects of Intellectual Property rights (TRIPs for short), underwritten in 1994, regarding economic growth for both wealthy and developing countries. We find that the TRIPs convention has prompted, at the same time, innovation in developing countries and a rise in the per capita income for all the economies involved in international commerce. As a by-product of our research we find that, despite the strong growth of resident patents application after 1995 (the year in which TRIPs came into force), most of the increase in the gross domestic product per capita in developing countries is attributable to the international transfer of technologies, via foreign direct investments.     

The role of reciprocation in social network formation,with an application to LiveJournal

This paper deals with the role of reciprocation in the formation of individuals’ social networks. We follow the activity of a panel of bloggers over more than a year and investigate the extent to which initiating a relation brings about its reciprocation. We adapt a standard capital investment model to study how reciprocation affects the build-up of the individual social capital of bloggers, as measured by their links and interactions with others. This allows us to measure the role of content production and relationship building in the dynamics of online social networks and to distinguish between the social networking and media aspects of blogging.     

加缪“荒诞人”的非本真生存

荒诞人是阿尔贝.加缪在荒诞理论中描述的重要概念,也是他探索人生存方式的鲜活载体。针对荒诞人在操作层面的反抗、激情和自由分析得出荒诞人的生活追求是非本真生存的再现,并和加缪在《局外人》中塑造的局外人的本真生存形成鲜明的对比。     

β-环糊精修饰区带毛细管电泳法测定野菊花中的刺槐素、木犀草素和槲皮素

野菊花是菊科植物野菊(Chrysanthem indicumL.)的干燥头状花序,具有清热解毒、降血压等功效[1],药理作用有抗毒、改善血液循环、抑制血小板聚集和增强吞噬细胞等功能[2],临床将野菊花浸膏制成栓剂,对慢性盆腔炎、宫颈糜烂、慢性前列腺炎等有显著疗效[3]。野菊花的主要有效成分为黄酮类化合物,准确测定野菊花中的黄酮类化合物对于其质量控制和确保疗效具有重要的意义。毛细管电泳法是20世纪80年发展起来的一种新的分离分析新方法,具有分析速度快、分离效率高、样品和溶剂消耗量小、毛细管柱寿命长和容易清洗等优点,已经被广泛用于中草药成分…     

沙芥罐头加工技术研究

对沙芥罐头加工技术进行了研究。结果表明,一定浓度的铜离子可达到较好的护绿效果;在汤料中加入糖和香味物质、降低汤液的pH值、采用常温杀菌工艺能达到商业杀菌要求。在室温下可贮藏6个月,保持绿色不褪,感官质量也得到改善。     

试析阿尔都塞的“症候阅读”

“症候阅读”与意识形态、文本结构及总问题存在着复杂的逻辑关联。意识形态是症候阅读的根源,它决定了文本的结构以及思想理论的总问题,所以,虽然文本结构是症候阅读的直接对象,但症候阅读的关键是要抓住潜藏着的总问题。对症候阅读的内在含义的分析也表明,症候阅读的实质就是总问题的阅读。