Farm management optimization using chance constrained programming method

This paper presents a stochastic optimization model to determine the optimal number of acres of hay a farm should harvest for their own horses’ consumption, as well as how much hay to purchase and sell to maximize the total profit of the farm. This research is motivated by horse farmers who must make yearly decisions concerning the management of feeding horses. These decisions are affected by the cost to grow their own hay, the cost to buy hay, the cost associated with selling hay, and the stochastic nature of crop yield due to different weather conditions. The uncertainty of weather conditions is included in the mathematical model by including random variables in the model constraints. Optimal policies are obtained for a real world case study provided by a Kentucky horse farmer by applying chance constrained programming method. A sensitivity analysis is performed to show the effectiveness of the approach.     

关于改进公共第二外语教学的思考

从分析公共第二外语教学的现状和存在问题入手．阐述了公共第二外语教学的重要性,并提出了实行弹性化教学时数、学习内容要有所侧重、加强实际能力培养、千方百计克服班容量大的困难、编写实用的教材等几点提高教学质量的建议和方法。     

网络环境下词表发展的几点探讨——从UMLS说起

首先简单介绍了UMLS结构的特点以及UMLS在网络环境下的具体应用——PubMed检索系统,接着指出了目前国内词表的缺点,最后对照UMLS以及目前一些成功词典结构给出了网络环境下词表结构发展的一些建议。     

Optimization Algorithm Research on the Arch Axis of Steel Box-Concrete Composite Arch Bridge

The paper proposed an innovative optimized design philosophy of the optimal arch axis of steel box-concrete arch bridge. Formulas to calculate the arch axis at the arch crown and the arch springing of this type of arch bridge were respectively derived wit     

以语言能力发展为导向的高校汉语课程体系构建

高等教育是个人母语能力发展的重要阶段,高校语言教育需要构建科学的汉语课程体系。目前高校素质教育课程中包含了一些汉语教育的课程,但是语言教育意识不够突出,现有的以大学语文、应用写作和普通话训练等为主干的汉语课程为高校学生提供了提升汉语能力的途径,但是课程设置还存在定位模糊、教学目标不明确等问题,不能满足大学生母语教育的需要。构建以发展语言能力为目标的汉语课程体系应该把握三个原则：课程设置以发展语言能力为核心目标进行统筹规划;课程开发以语言能力量表为依据;课程内容编排要满足语言应用实践。     

基于R语言的冬小麦品种稳定性分析

旨在确定适宜的品种稳定性分析参数及其计算方法。利用冬小麦区域试验数据,通过R语言计算了14个稳定性参数,并采用秩相关和主成分分析,研究了参数的功效和相关性。结果表明,R语言可以方便、灵活的计算各类参数;相关分析表明,PCOA和产量极显著正相关,CV和Bi极显著正相关,Sigma.square和Si、Si2、Si3、ASV极显著正相关,ASV和Si6极显著正相关;主成分分析表明,14个稳定性参数可以分为3组,组1包含Bi,与多数参数负相关,与产量相关性不显著,组2包含YIELD、Pi、YSI、CV和PCOA,与产量显著正相关,组3包含Sigma.square、S.square、ASV、Si、Si2、Si3、Wi、Si6,与产量相关性不显著。研究表明,ASV和Si与其他参数间的相关性较好,PCOA模型能够同时评价品种产量及其稳定性,三者是单变量参数模型的有益补充。     

基于XML的数字签名在电子病历的应用方法

针对文件数字签名在电子病历应用中存在只能整体签名、重复性签名等诸多限制和问题,提出改用XML数字签名。实现结果表明,XML数字签名可支持多种方式的文档数据转换,可以实现对电子病历进行部分和多方签名验证,并能提供清晰易读的密钥信息,更加便于签名的自动检验处理。因此,在电子病历的应用中,XML数字签名较文件数字签名在平衡安全性和数据库空间节约性上具有明显优势。     

Programming of postnatal phenotype caused by exposure of cultured embryos from Brahman cattle to colony-stimulating factor 2 and serum

Alterations in the environment of the preimplantation embryo can affect competence to establish pregnancy and phenotype of resultant calves. In this study, the bovine embryo produced in vitro was used to evaluate postnatal programming actions of the embryokine colony-stimulating factor 2 (CSF2) and serum, which is a common additive of culture media. Oocytes were collected by ovum pick up from Brahman donors and fertilized with semen from Brahman bulls. Embryos were randomly assigned to one of the three treatments: vehicle, CSF2 10 ng/mL, or 1% (v/v) serum. Treatments were added to the culture medium from day 5 to 7 after fertilization. Blastocysts were harvested on day 7 and transferred into crossbred recipients. Postnatal body growth and Longissimus dorsi muscle characteristics of the resultant calves were measured. The percent of cleaved embryos becoming blastocysts was increased by serum and, to a lesser extent, CSF2. Treatment did not affect survival after embryo transfer but gestation length was shortest for pregnancies established with serum-treated embryos. Treatment did not significantly affect postnatal body weight or growth. At 3 mo of age, CSF2 calves had lower fat content in the Longissimus dorsi muscle and less subcutaneous fat over the muscle than vehicle calves. There was a tendency for cross-sectional area of the muscle to be smaller for serum calves than vehicle calves. Results confirm the importance of the preimplantation period as a window to modulate postnatal phenotype of resultant calves. In particular, CSF2 exerted actions during the preimplantation period to program characteristics of accumulation of intramuscular and subcutaneous fat of resultant calves. The use of a low serum concentration in culture medium from day 5 to 7 of development can increase the yield of transferrable embryos without causing serious negative consequences for the offspring.     

3S技术在县级林地保护利用规划中的应用研究

以福建省浦城县林地保护利用规划为例,应用SPOT 5卫星影像,运用地理信息系统、GPS技术解决林地落界、林地保护等级、林地质量定级等林地保护规划中的具体问题。结果表明:3S技术是县级林地保护利用规划的重要支撑技术,同时是提高规划效率不可或缺的信息化工具。     

符号学在彝族新园林设计中的应用研究

根据皮尔斯符号分类学的三分法,结合彝族的文化发展、民族信仰等自身特点,从民居建筑、图腾文化、彝族崇拜物、文化内涵等方面对符号学在彝族新园林中的应用进行了具体阐述,探讨了可理解性、交流性、可对话性的彝族园林丰富设计语言。