对职业教育集团化相关理论的再认识

近年来,职业教育集团发展迅猛,但与职教集团的发展实践相比,其理论研究显得相对滞后。从职业教育集团化办学的投入产出理论、资源依赖理论、交易费用理论、博弈论与策略联盟、产业集聚理论等相关理论进行分析,以期为我国职业教育集团化办学提供理论支撑,同时引发一些职教研究者和实践者的进一步思考。     

论影响法律确定性的因素

大陆法系的传统理论认为确定性是法律的最高价值目标,但是法律实践的经验却表明由于受到法律语言的模糊性、法律的漏洞以及社会生活的多样等因素的影响,绝对确定的法律既不存在,也无法实现司法公正的,因此笔者认为法律解释是弥合追求法律确定性和实现司法公正之间矛盾的有效方法。     

Decision support system for the batching problems of steelmaking and continuous-casting production

This paper investigates two batching problems for steelmaking and continuous-casting (SCC) production in an integrated iron and steel enterprise. The tasks of the problems are to make the decisions as how to consolidate ordered slabs into charges, and then how to group charges into casts. The effective decisions on these batching problems can help to balance the requirements of materials in downstream production lines, improve the customer satisfaction levels, and reduce production costs (including reduction of open ordered slabs, less slabs quality upgrading, reduction of steel-grade changeovers, and reduction of inefficient utilization of tundishes lives). We first formulate the problems as integer-programming models by consider practical constraints and requirements, and then develop the two heuristic algorithms for the corresponding batching problems. By embedding above models and algorithms, we develop decision support system (DSS) software with interactive planning editor. The DSS has been tested by using practical data set collected from the steelmaking plant in Baosteel which is one of the most advanced iron and steel enterprises in China. Computational experiments demonstrate that the models and algorithms developed can generate the satisfactory solutions when they work together with the planning editor in the DSS.     

国家科技奖励是通向院士大门的敲门砖吗?

本文采用公开的数据资料对两院院士候选人及当选院士获得国家科技三大奖励的比例进行了实证研究。研究发现,近年来中国科学院院士候选人和当选院士中以第一完成人名义获得国家自然科学奖和国家科技进步奖的比例均明显上升;中国工程院院士候选人和当选院士中以第一完成人名义获得国家发明奖和国家科技进步奖的比例均明显上升。获得国家自然科学奖和国家科技进步奖对两院院士增选第一轮评选有明显的正面影响,但是对第二轮及以后的评选没有明显的影响。获得国家发明奖只对中国工程院院士增选第一轮评选有一定的正面影响。这大概就是圈内所谓获得国家科技奖励是通向两院院士大门的"敲门砖"的真实含义。     

随机效应广义空间滞后半参数变系数面板模型的估计

通过构建同时包含因变量和误差项空间滞后的随机效应半参数变系数面板模型,拓展了现有模型的灵活性和适应性。采用截面极大似然估计方法得出了参数和非参数的估计,理论证明发现：在一定的正则条件下,所有估计量具有一致性和渐近正态性。数值模拟显示：估计量具有良好的小样本性质,估计精度随着样本容量的增加而增加;空间权重矩阵的选择对估计量的表现没有产生显著差异,但是在Case权重矩阵下,当样本量相同时,空间相关系数的估计偏差随着空间权重结构复杂度的增加而扩大。     

我国可再生能源法律法规与政策研究

近年来,我国出台了一系列可再生能源法律法规和相关政策,逐渐形成了以《可再生能源法》为主、相关配套法律法规为辅的较为完善的可再生能源法律法规和政策体系。但是,国家在不断完善可再生能源法律法规和相关政策的过程中,也存在着法律法规不齐全、综合性较差、内部条款不协调、立法级别低、与保护自然生态环境的联系不够紧密等问题,与发达国家和地区相比仍有一定的差距。针对这些问题,我国应通过落实现有的可再生能源法律及政策保障制度、完善可再生能源立法和政策体系、协调可再生能源法律法规与政策和其他相关法律与政策之间的关系、加大可再生能源开发利用监管力度、坚持和完善能源市场化发展机制和公民参与机制等措施,不断完善和改进我国的可再生能源法律法规和政策体系。     

Creating catalogues of two-level nonregular fractional factorial designs based on the criteria of generalized aberration

We consider the problem of constructing good two-level nonregular fractional factorial designs. The criteria of minimum G and G₂ aberration are used to rank designs. A general design structure is utilized to provide a solution to this practical, yet challenging, problem. With the help of this design structure, we develop an efficient algorithm for obtaining a collection of good designs based on the aforementioned two criteria. Finally, we present some results for designs of 32 and 40 runs obtained from applying this algorithmic approach.     

Prediction of accrual closure date in multi-center clinical trials with discrete-time Poisson process models

In a phase III multi‐center cancer clinical trial or a large public health study, sample size is predetermined to achieve desired power, and study participants are enrolled from tens or hundreds of participating institutions. As the accrual is closing to the target size, the coordinating data center needs to project the accrual closure date on the basis of the observed accrual pattern and notify the participating sites several weeks in advance. In the past, projections were simply based on some crude assessment, and conservative measures were incorporated in order to achieve the target accrual size. This approach often resulted in excessive accrual size and subsequently unnecessary financial burden on the study sponsors. Here we proposed a discrete‐time Poisson process‐based method to estimate the accrual rate at time of projection and subsequently the trial closure date. To ensure that target size would be reached with high confidence, we also proposed a conservative method for the closure date projection. The proposed method was illustrated through the analysis of the accrual data of the National Surgical Adjuvant Breast and Bowel Project trial B‐38. The results showed that application of the proposed method could help to save considerable amount of expenditure in patient management without compromising the accrual goal in multi‐center clinical trials. Copyright © 2012 John Wiley & Sons, Ltd.     

CRM赢回策略对消费者购买行为影响的实证研究

一直以来,营销学界都把客户关系管理(Customer Rehtionship Management)的重点放在如何获得新顾客和维持现有顾客身上,而流失顾客赢回管理工作的重要性却长久地被忽视.为了证明失而复得顾客的重要价值,作者把顾客在流失前、赢回后两个不同阶段的满意度和购买份额作对比分析,结果发现,赢回后的顾客满意度和购买份额较流失前显著增加;用关系投资或价格促销策略赢回来的顾客满意度和购买份额,较被关系投资或价格促销吸引来的新顾客满意度和购买份额显著提高;流失前,顾客满意度与购买份额之间拟合的函数曲线呈反S型,厂商策略对这一阶段的顾客行为影响不显著;赢回后,顾客满意度与购买份额之间拟合的函数曲线呈S型,赢回策略对这一阶段的顾客行为影响显著;满意度与购买份额拟合的函数曲线参考点发生了位移.     

书卷有韵 “山谷”逸致——浅谈王金笛的书法意境

2012年9月,为迎接中国共产党第十八次全国代表大会的胜利召开,辽宁省举办了一次省直机关干部喜迎十八大书画展,其中,两幅书写着曹操"老骥伏枥,志在千里"和黄庭坚"黄菊枝头生晓寒,人生莫放酒杯干"全部诗句的作品,在那些众多的书法作品中脱颖而出,特别吸引着我的眼球。好一个长枪大戟,奇崛宕逸的"山谷体"!这两幅书法的作者就是王金笛先生,这