反相容工件系统的加权完工时间和的重新排序问题(英文)

重新排序问题是指在原始工件已经安排好的情形下,新到的工件集与原始工件集一起重新再排序,这是实际工作中常见一类优化问题。本文考虑了单机上当工件加工时间与权重反相容时,在最大错位量约束下的加权完工时间和最小化的重新排序问题。对于提出的四个问题,即在最大序列错位、最大时间错位、总序列错位和总时间错位约束下的加权完工时间和重新排序,基于问题的结构性质,运用动态规划方法分别给出了这些问题的多项式时间或拟多项式时间算法。

一种数据块相关标记码的测试数据压缩方法

提出了一种类似于字典索引的编码压缩方法,该方案将与参考数据块相容、反相容的测试数据块用"0""、1"标记来压缩数据,并用定长的数据来标识与参考数据块相关的数据块个数。通过分析可知方案的解压电路结构简单,所需的硬件开销很小,对ISCAS’89基准电路的实验结果表明,该编码方法能有效地压缩测试数据。

Active learning based on maximizing information gain for content-based image retrieval

This paper describes a new method for active learning in content-based image retrieval. The proposed method firstly uses support vector machine (SVM) classifiers to learn an initial query concept. Then the proposed active learning scheme employs similarity measure to check the current version space and selects images with maximum expected information gain to solicit user's label. Finally, the learned query is refined based on the user's further feedback. With the combination of SVM classifier and similarity measure, the proposed method can alleviate model bias existing in each of them. Our experiments on several query concepts show that the proposed method can learn the user's query concept quickly and effectively only with several iterations.

组氨酸接枝聚介导的RNA干扰技术对大鼠肝脏主要组织相容性复合体Ⅱ类基因及其反式激活因子基因表达的抑制作用

目的 观察应用新型纳米载体组氨酸接枝聚（β-氨基酯）（HGPAEs）介导的RNA干扰技术对大鼠肝脏主要组织相容性复合体Ⅱ类基因（MHC-Ⅱ）及其反式激活因子基因（CⅡTA）表达的抑制作用.方法 构建HGPAEs及针对大鼠CⅡTA基因的短发夹RNA（shRNA）质粒,并将两者耦合成pCⅡTA-HGPAEs载体,分别设置生理盐水组、单纯HGPAEs组、pHK-HGPAEs阴性对照组和pCⅡTA-HGPAEs干预组,通过门静脉注射方法体内转染大鼠肝脏,分别采用荧光定量聚合酶链式反应（FQ-PCR）和Western blot检测转染后CⅡTA和MHC-Ⅱ基因的mRNA转录水平及蛋白表达水平.结果 成功构建载shRNA质粒的HGPAEs载体,体内转染大鼠肝脏后,pCⅡTA-HGPAEs组CⅡTA与MHC-Ⅱ基因的mRNA转录水平及蛋白表达水平显著下降（P＜0.01）,与生理盐水组比较,C ⅡTA及MHC-Ⅱ转录水平分别为（21.4±4.2）％和（26.3±5.8）％,蛋白表达水平分别为（21.6±7.6）％和（27.8±5.6）％.而生理盐水、HGPAEs、pHK-HGPAEs组转染后CⅡTA与MHC-Ⅱ基因mRNA转录水平及蛋白表达水平差异无统计学意义（P＞0.05）.结论 HGPAEs是一种较为理想的基因转运载体,应用RNA干扰技术经门静脉注射方法转染大鼠肝脏,可显著抑制CⅡTA和MHC-Ⅱ基因表达.

Overview of Simple Test for Determination of Surfactants by Adhesion Method

A simple, sensitive, and rapid analytical method is reported for the determination of surfactants. This is based on the use of an oppositely charged dye as the ion pair to form an ionic associate with the surfactant in a vessel, thus affording ion-associated adhesion on the inner wall of the vessel. After the adhesion, the remaining solution in the vessel is removed, and the ionic associate is dissolved in a suitable solvent. The absorbance of the resulting solution is measured spectrophotometrically to determine the concentration of the surfactant. Further, the mechanism of adhesion is elucidated.

Synthesis and electrochemical performance of Li_2Mg_(0.15)Mn_(0.4)Co_(0.45)SiO_4/C cathode material for lithium ion batteries

The synthesis, structure and performance of Li2Mg0.15Mn0.4Co0.45SiO4/C cathode material were studied. The Li2Mg0.15Mn0.4Co0.45SiO4/C solid solution with orthorhombic unit cell （space group Pmn21） was synthesized successfully by combination of wet process and solid-state reaction at high temperature, and its electrochemical performance was investigated primarily. Li2Mg0.15Mn0.4Co0.45SiO4/C composite materials deliver a charge capacity of 302 mA-h/g and a discharge capacity of 171 mA.h/g in the first cycle. The discharge capacity is stabilized at about 100 mA-h/g after 10 cycles at a current density of 10 mA/g in the voltage of 1.5-4.8 V vs Li/Li^＋. The results show that Mg-substitution for the Co ions in Li2Mn0.4Co0.6SiO4 improves the stabilization of initial structure and the electrochemical nerformance.

Retinal Prosthesis:A Potential Benefit for the Blind

Retinal degenerative diseases may induce the degeneration of outer retina and in turn,blindness.Nevertheless,due to the maintenance of inner retina,the coding and processing of visual neurons responses are still able to be executed naturally.Therefore,an effective retinal prosthesis device may be developed by mimicking the function of outer retina:transferring the visual light into artificial stimulus and delivering the stimulus to the retina aiming to evoke the neural responses.As two main developing directions for current retinal prosthesis,epiretinal(ER)and subretinal(SR)prosthesis are both undergoing experimental stage and possessing advantages and limitations.Further investigations in power supply,biocompatibility,etc.are still required.Additionally,suprachoroidal transretinal stimulation(STS)and neurotransmitter-induced stimulation as some other alternatives in retinal prosthesis are also considered as promising research directions,although they are not mature enough to be applied commercially,either.

Cell responses and hemocompatibility of g-HA/PLA composites

The objective of this study was to investigate the hemocompatibility and cell responses to some novel poly（L-lactide） （PLA） composites containing surface modified hydroxyapatite particles for potential applications as a bone substitute material. The surface of hydroxyapatite （HA） particles was first grafted with L-lactic acid oligomers to form grafted HA （g-HA） particles. The g-HA particles were further blended with PLA to prepare g-HA/PLA composites. Our previous study has shown signifi- cant improvement in tensile properties of these materials due to the enhanced interracial adhesion between the polymer matrix and HA particles. To further investigate the potential applications of these composites in bone repair and other orthopedic sur- geries, a series of in vitro and in vivo experiments were conducted to examine the cell responses and hemocompatibility of the materials. In vitro experiments showed that the g-HA/PLA composites were well tolerated by the L-929 cells. Hemolysis of the composites was lower than that of pure PLA. Subcutaneous implantation demonstrated that the g-HA/PLA composites were more favorable than the control materials for soft tissue responses. The results suggested that the g-HA/PLA composites are promising and safe materials with potential applications in tissue engineering.