共查询到20条相似文献，搜索用时 781 毫秒
1.
在水声通信中,由于多径效应引起的时间延迟扩展不仅限制了信道的带宽,还引发了码间干扰（ISI）,限制了系统的传输性能.为了降低码间干扰提升系统的传输性能,可采用自适应均衡器来限制码间干扰.采用基于LMS（LeastMean Square）算法的自适应均衡器来提升系统的传输性能,并通过Matlab进行仿真. 相似文献
2.
针对电力市场中一类非线性博弈模型的混沌问题,通过加入脉冲时间延迟反馈控制,对其稳定性进行研究。第一种形式是对一家投资商引入系统变量的时间延迟反馈控制法,第二种形式是对整个系统引入系统变量的时间延迟反馈控制,并利用Matlab软件对该系统进行数值模拟,验证该方法的有效性。结果表明：时间延迟反馈控制可以有效控制系统的稳定性。 相似文献
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目击记忆中的检索问题在国外应用心理学，特别是证人心理学中早有研究。目击记忆的信息检索受多种因素的影响。目击取证中影响事件检索的主要因素是特征编码效应，干扰效应，检索策略效应。具体而言，特征编码效应是指：(1)原来的场景以物理或心理的形式恢复目击应能回忆出更多的细节；(2)某条线索不能提取的细节可由另一线索提取；(3)事件编码依赖个体的特性。干扰效应则主要包括：(1)相关事件对靶事件检索的干扰；(2)社会反应偏向的干扰影响。检索策略效应是指：(1)考虑情境内容和来源有助于恢复记忆；(2)细节的记忆促进靶事件的提取；(3)元记忆控制策略；(4)系统组织化有利于检索信息。 相似文献
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近年来,大学生危机事件频发,严重干扰了大学生的生活与学习秩序,甚至威胁到大学生生命财产安全,这些问题应引起人们对高校维稳及应急处理管理工作的重视。大学生危机事件管理是高校管理工作的新课题,构建行之有效的危机事件管理的预防与应急处置体系,稳妥地处理危机事件,对于学生、学校、社会乃至国家都具有重要意义。 相似文献
6.
庚子鼠年注定是不平凡的一年。2019年底,新型冠状病毒肺炎疫情在我国湖北武汉爆发并在短时间内不断扩大影响范围。受此事件影响,企业复工时间延迟、春季开学时间延迟、部分地区高校研究生复试安排也被推迟……即将毕业的高校学生在就业、考研等准备工作中也不可避免的受到了波及。 相似文献
7.
王琨 《洛阳师范学院学报》2014,(8):36-39
在现有的研究中,关于光线在Kerr场中的时间延迟的计算都限制在Boyer-Lindquist(B-L)坐标系中.其中由引力源旋转引起的时间延迟属于二阶效应.由于时间延迟效应的计算在不同坐标系(如标准坐标系,各项同性坐标系,谐和坐标系)下的结果是不同的,所以当考虑旋转效应时,计算是在哪种坐标系中进行的必须给出说明.本文研究了谐和坐标系下Kerr场中赤道面内光线传播时的时间延迟,给出了二阶的解析计算,并将所得结果与B-L坐标系中的结果进行对比.结论表明,两种坐标系的差异对时间延迟的效应的量级远大于引力源的旋转效应. 相似文献
8.
蒋科杰 《数学学习与研究(教研版)》2010,(15):96-96
在没有时间延迟的IF模型中,神经元的同步性比较差,神经元发放不规则,很容易在噪声强度较弱时就产生同一时刻只有一个神经元发放的现象.而在有时间延迟的IF模型中,神经元发放的同步性比没有时间延迟时要好,发放也较规则,不容易在噪声强度较弱时产生同一时刻只有一个神经元发放的现象. 相似文献
9.
前瞻记忆领域长期以来忽视了对混合型前瞻记忆的研究。本研究采用混合实验设计,考察任务重要性对混合型前瞻记忆和基于事件前瞻记忆在不同时段的前瞻干扰效应的影响。结果表明,基于事件前瞻记忆的干扰效应在任务重要性上有主效应,混合型前瞻记忆的干扰效应在任务重要性和时段因素上有交互作用。说明任务重要程度没有改变基于事件前瞻记忆的注意资源分配持续性的总体趋势,但对混合型前瞻记忆的不同时段产生不同影响。根据结果,对现有多重加工理论的内容做了补充。 相似文献
10.
受国际国内各方面因素影响,高校学生危机事件时有发生。高校学生危机事件的发生不仅严重干扰着高校正常的教学秩序和生活秩序,也对学生的身心健康造成不利影响。对于身处学生工作第一线的辅导员而言,如何预防、处理、应对高校学生危机事件,促进学校的和谐发展,是学术界应当努力探讨的重要课题。本文在梳理学术界关于高校学生危机事件相关理论的基础上,指出辅导员在高校学生危机事件处置中存在的问题,并就如何加强辅导员对高校危机事件的预警及应对能力以及如何充分发挥辅导员的作用作出有益探索。 相似文献
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应用基于时域有限差分法(FDTD)的XFDTD仿真工具分析研究2.4/5.2/5.7GHz穿戴式躯域传感器网络(W-BSN)的体表路径损耗和时延特性.仿真环境为置于自由空间中的简化三维人体模型.分析结果表明,当工作频率较高时,路径损耗相对较小;当发送点和接收点都置于主躯干时,路径损耗与最小等效体表距离遵循对数拟合模型,并且2.4,5.2,5.7GHz下的衰减指数分别为4.7,4.1和4.0.另一方面,各接收点的首径延迟约小于2ns,而最大时延扩展为10ns.为避免多径延迟引起的码间干扰,建议W-BSN的传输速率应小于108符号/s. 相似文献
12.
Two conditioned suppression experiments with rats were conducted to determine whether the spontaneous recovery and renewal
that are commonly observed in retroactive outcome interference (e.g., extinction) also occur in retroactive cue interference.
Experiment 1 showed that a long delay between Phase 2 (the interfering phase) and testing produces a recovery from the cue interference
(i.e., the delay enhanced responding to the target cue trained in Phase 1), which is analogous to the spontaneous recovery
effect observed in extinction and other retroactive outcome interference procedures. Experiment 2 showed that, when target and interfering cues are trained in separate contexts and testing occurs in a different but familiar
context, a recovery from the cue interference is also observed (i.e., the context shift enhanced responding to the target),
which is analogous to ABC renewal from extinction. The results are discussed in terms of the possibility that similar associative
mechanisms underlie cue and outcome interference. 相似文献
13.
Louis M. Herman 《Learning & behavior》1975,3(1):43-48
Interference in auditory short-term memory in the bottlenosed dolphin,Tursiops truncatus (Montagu), was studied using a delayed matching-to-sample task. At each trial, one of two sample sounds, chosen randomly, was projected underwater for 4 sec and then, after a variable delay interval, both sounds were presented. A response to the sound matching the initial sample was reinforced. Correct matching was significantly reduced following short intervals between trials in combination with long delays after the sample (proactive interference), or when a near continuous irrelevant sound was inserted into the delay interval (retroactive interference). There was rapid habituation to interference if the irrelevant sound was short in duration relative to the delay interval. For both proactive and retroactive interference, the errors were predominantly responses to the sample sound appropriate to the prior trial rather than to the current trial, indicating that memory for the relative recency of events (temporal memory) was degraded by interference. When interference was deleted or minimized, temporal memory remained nearly perfect over 30-sec delay intervals, the longest tested. The importance of distinguishing between temporal memory and nontemporal, or event, memory in different forms of the delayed matching task was emphasized. 相似文献
14.
模拟电话信道既能传输传真数据，又能对数据传输进行限制．影响数据传输质量的主要因素为：群时延失真、衰减失真以及回波引起码间干扰；谐波失真与噪声会降低噪比；相位抖动与相位突变则会造成误码． 相似文献
15.
华陈权 《实验室研究与探索》2000,19(5):103-105
该装置引入了以PID为基础的智能控制算法,有效地改善了炉温大纯滞后过程启动和间歇大扰动的动态品质。独特的冷端补偿方法有效地减少了常规补偿引入的误差;利用参考函数使温度和热电势之间的转换很方便。由于改进为自动检定装置,实现了自动连续检定,从而提高了工作效率和检定质量。 相似文献
16.
The conditions necessary for producing retroactive interference (RI) were examined in a 12-arm radial maze. Rats were first given either three or nine forced choices in a to-be-remembered maze. During a 2-h delay, they received one or two trials in a second 12-arm maze, located either in a different room or the same room as the to-be-remembered maze. During the postdelay memory test, RI from the interference trials was produced only when nine choices had been made in the to-be-remembered maze and two interference trials had been conducted during the delay interval. RI was not found when only three forced choices had to be retained or after a single interference trial. The similarity between the interpolated and to-be-remembered mazes had no effect on choice accuracy. It was concluded that two conditions are required for the production of RI in the radial maze. First, a “large amount” of information should be resident in working memory. Second, a substantial number of interpolated trials or choices must be made during the delay. 相似文献
17.
The effect of interference treatments on pigeons’ working memory for event duration was investigated, using a successive matching-to-sample procedure. In three experiments, birds were trained to match different keylight durations (2 or 6 sec) to different comparison colors (red or green) following delays of 0 to 12 sec. The interfering effect of delay-interval illumination and illumination change was assessed in Experiments 1 and 2. It was found that the absolute levels of houselight illumination influenced delayed matching accuracy. Birds trained with houselight illumination showed larger decrements in matching accuracy with increasing delays than did birds trained with darkened delay intervals. In addition, increases in delay-interval illumination relative to baseline produced greater interference with delayed matching accuracy than did decreases in houselight illumination relative to baseline. In Experiment 3, the effect of interpolated instructional cues to remember or forget was examined. As in other directed forgetting experiments employing conventional modality characteristics as the samples to be remembered, it was found that instructional cues to forget, presented during the delay interval, reduced matching accuracy compared to instructional cues to remember. It was concluded that these findings support models of temporal memory that assume temporal information is coded into categorical information onto some nontime dimension over models that assume temporal information is remembered amodally as specific time durations. 相似文献
18.
Douglas L. Medin 《Learning & behavior》1980,8(4):553-560
Two prominent theories of proactive interference in animal memory predict that the effects of varying the interval between the interfering and to-be-remembered stimulus in a delayed-matching-to-sample paradigm ought to be comparable to the effects of manipulating the retention interval. To assess this prediction, monkeys were tested in a situation in which a sample was presented, followed by a variable intersample interval, whereupon a second sample was presented. After a delay interval, a choice test was given between the two stimuli that had served as samples. The correct choice was always the most recently presented sample stimulus, and the initial sample of a sequence provided a potential source of proactive interference. In two experiments, delay interval altered performance, whereas interstimulus interval had little or no effect. In a third experiment, using a small set of sample stimuli, intertriai interval altered proactive interference, but again interstimulus interval had no effect. One way of accounting for these data is in terms of distinct short- and long-term memory processes. 相似文献
19.
Robert A. Rosellini 《Learning & behavior》1978,6(2):155-159
This article reports the reinforcer generality of the interference effect resulting from exposure to inescapable shock. In Experiment 1, rats that received inescapable shock showed weak interference with the acquisition of an appetitive operant compared to animals exposed either to escapable or no shock. In Experiment 2, the response-reinforcer contingency was degraded by introducing a 1-sec delay of reinforcement on the appetitive task. Inescapable shock produced much stronger interference with the acquisition of the operant response than in Experiment 1. The results demonstrate reinforcer generality of the debilitating effects produced by inescapable shock. 相似文献
20.
The Robustness of Infant Haptic Memory: Testing Its Capacity to Withstand Delay and Haptic Interference 总被引：1，自引：0，他引：1
Di Catherwood 《Child development》1993,64(3):702-710
The robustness of infant haptic memory was assessed in terms of its capacity to withstand either a brief delay or potential retroactive "interference" from other haptic input. 48 infants (mean age 8 months) were familiarized haptically to a small cube or sphere with smooth or rough surface texture and subsequently tested for recognition of the shape and texture of this stimulus in terms of the relative level of haptic response to 3 test stimuli, comprising the familiar stimulus, a new-shape stimulus, and a new-texture stimulus. The test stimuli were presented ( a ) immediately, ( b ) after a 5-min delay, or ( c ) after a second familiarization or "interference" phase involving another haptic stimulus different in shape and texture to the first. The infants demonstrated recognition of shape and texture in the No Delay condition, of shape and (marginally) of texture in the Delay condition, but only of texture in the Interference condition. The greater susceptibility of shape to interference was considered in terms of the degree of similarity among the shapes employed in the study. 相似文献