网络教学环境下士官《计算机应用基础》课程探究式教学改革

探究式教学是当前院校教学改革的热点之一。随着网络信息技术的快速发展,为不断改革和完善士官《计算机应用基础》课程教学的方式方法,提出在《计算机应用基础》课程教学中依托多媒体信息技术和网络资源进行探究式教学改革实践,激发学员学习兴趣,培养自主学习习惯,提高计算机应用能力。     

柬教官计算机专业外训教学探索

近年来,我室承担了柬埔寨教官计算机专业培训的外训教学任务,由于没有外训经验,教学过程中面临许多新问题,任务艰巨。如何有效实施计算机专业外训教学,提升外训教学水平是当前迫切需要探索的课题。从柬教官的特点和计算机专业的特点出发,对外训教学的规范化问题提出了几点看法,以期为提高教学效果提供借鉴。     

A robust hybrid approach based on particle swarm optimization and genetic algorithm to minimize the total machine load on unrelated parallel machines

This paper dealt with an unrelated parallel machines scheduling problem with past-sequence-dependent setup times, release dates, deteriorating jobs and learning effects, in which the actual processing time of a job on each machine is given as a function of its starting time, release time and position on the corresponding machine. In addition, the setup time of a job on each machine is proportional to the actual processing times of the already processed jobs on the corresponding machine, i.e., the setup times are past-sequence-dependent (p-s-d). The objective is to determine jointly the jobs assigned to each machine and the order of jobs such that the total machine load is minimized. Since the problem is NP-hard, optimal solution for the instances of realistic size cannot be obtained within a reasonable amount of computational time using exact solution approaches. Hence, an efficient method based on the hybrid particle swarm optimization (PSO) and genetic algorithm (GA), denoted by HPSOGA, is proposed to solve the given problem. In view of the fact that efficiency of the meta-heuristic algorithms is significantly depends on the appropriate design of parameters, the Taguchi method is employed to calibrate and select the optimal levels of parameters. The performance of the proposed method is appraised by comparing its results with GA and PSO with and without local search through computational experiments. The computational results for small sized problems show that the mentioned algorithms are fully effective and viable to generate optimal/near optimal solutions, but when the size of the problem is increased, the HPSOGA obtains better results in comparison with other algorithms.     

基于玻尔兹曼的微机械陀螺温度误差补偿

使用最优拟合的方法,在一定的温度范围内,对微机械陀螺仪温度误差建模,通过温度误差模型对陀螺仪输出进行温度误差补偿。应用线性拟合和玻尔兹曼拟合方法对实验数据进行按拟合修正,该方法减小了温度对微机械陀螺仪的影响,并验证玻尔兹曼误差模型的正确性与可实用性。补偿后的数据较陀螺原始数据零偏,提高了1~2个数量级。在工程实际中有一定的实用参考价值。     

基于网络环境下对日志系统攻击的机理分析与研究

日志系统的安全对计算机安全来说至关重要,分析了日志系统受到攻击的位置和不同类型。并从日志系统的机密性、完整性和可用性三个方面对日志系统受到攻击的机理进行了详细的分析。最后,对日志系统如何防止受到各种攻击进行了总结。对在网络环境下计算机主机避免其日志系统受到攻击具有较强的指导意义。     

室内装修的环境污染及其预防探讨

介绍了室内环境污染的来源、装修材料的污染性,探讨了造成室内环境污染的因素,并在此基础上提出了一系列新型环保节能的建筑材料和室内装修污染的防治措施。     

节目传输机房接地系统浅析

根据无线局发射台节目传输机房具有的功能,分析了机房设备安全、人员操作安全和设备稳定运行所需的接地要求,并根据这些要求重点分析了电磁适应接地。     

Performance of estimating depth in projection based stereoscopic virtual display

Accurate distance estimation is essential for effective user interaction with objects appearing in the virtual space. Research has shown that the distance estimation in the virtual space is not as accurate as that in the real world. The inaccuracy phenomenon is almost exclusively documented for estimating objects appearing straight ahead of the eye. A collection of the accuracy data for targets located in different angles of view in the visual field may be useful in aiding the design of user‐virtual object interaction. This study collected the object to object distance estimation accuracy for targets displayed stereoscopically. There are five horizontal and two vertical viewing angles and three depths, resulting in a total of 30 locations in the virtual space. The distance estimation for any of the 30 object pairs were performed with or without the aid of spatial cues. Significant factors influencing the accuracy and time of distance estimation were identified. Implications of the finding were discussed with respect to the stereoscopic display environment.     

Effects of Auditory Cues for Linear and Differential Magnification Methods on Visual Inspection Performance

The unfavorable consequence of biased attention to peripheral objects was reported with the use of a newly proposed differential magnification method by the authors. Given the favorable influence of auditory cueing on attention orientation, this study investigated the effectiveness of auditory cues in directing participants’ attention from the peripheral to foveal areas of the differential magnifying lens for improving inspection performance. Thirty‐nine Chinese undergraduates performed a simulated inspection task using a particular magnification method (between‐participant factor). Three within‐participant factors of auditory cue interval, target difficulty, and magnification power were tested. Objective performance measures of speed and accuracy and subjective evaluation using NASA task load index were collected and analyzed. The results showed that positive effects of auditory cues were found for the differential magnification methods but not for the traditional linear magnification method. Significant effects of target difficulty and magnification power were also found. It was concluded that the aid of auditory cues, which did not share the same attentional resource with the visual inspection task, proved to be an appropriate reminder for the differential magnification methods to improve participants’ visual inspection performance. Attention should also be paid to selecting an appropriate auditory cue interval for search tasks of different target difficulties. The findings of this study have implications for the design of video magnifiers in the context of multimodal human–machine interfaces.     

用能量法分析体外预压力对简支梁动力性能的二阶效应

精细地考虑了体外筋变形中的二阶项,用能量法推导了体外预应力梁的自振频率,阐明了体外预压力对梁自振频率的效应.计算结果表明:体外预压力压缩软化效应的影响系数,主要取决于转向座的数量.无转向座时,体外筋偏心距损失为最大,影响系数为1,体外预压力的效应与外轴力的效应相同.随着转向座数量的增加,偏心距损失减小,体外筋接近于无粘结筋,影响系数降低至接近于0,即接近于无粘结筋预压力的零效应.当梁转向座的数量≥2时,由于影响系数显著地小于1,可以忽略体外预压力的压缩软化效应.随着体外筋面积和偏心距的增加,梁的第1自振频率增大.不过,体外筋对其他阶自振频率的影响很小,可以忽略.