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Search Results: 1 - 10 of 316841 matches for " 王智 "
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基于EDA-GA的置换流水车间调度算法
A Hybrid EDA with GA for the Permutation Flow Shop Scheduling Problem
 [PDF]

刘祝,
Operations Research and Fuzziology (ORF) , 2015, DOI: 10.12677/ORF.2015.51002
Abstract:
置换流水车间调度问题是工业工程中经典的组合优化问题,一般采用智能优化算法来求解该问题。作为一种新颖的优化算法,分布估计算法主要使用统计学习的方法指导搜索过程。然而,这种算法容易陷入到局部最优而出现过早收敛的现象。本文将分布估计算法与遗传算法结合,通过模糊逻辑控制来调节两种算法生成个体的比例。该算法有利于保持种群的多样性,避免了过早收敛。以Car类和Rec类算例进行测试,实验结果证实了本文所提出的混合算法的有效性。
The permutation flow shop scheduling problem is a classical combinatorial optimization in indus-trial engineering. Population-based evolutionary algorithms (EA) are the common methods to solve this problem. As a novel EA, estimation of distribution algorithm (EDA) directs the algorithm search towards good solutions by statistical learning. However, this algorithm may trap into the local optimal and lead to the premature convergence. To overcome the drawback of EDA, this paper incorporates EDA with GA to address the PFSP. The participation rates of EDA and GA are adaptively regulated by fuzzy logic controller. The experiment results on the benchmarks validate the efficiency of the proposed algorithm.
基于FPGA的相位同步快速算法研究与设计
Study and Design of Fast Synchronization in Phase Based on FPGA
 [PDF]

, 郑恭明
Journal of Sensor Technology and Application (JSTA) , 2016, DOI: 10.12677/JSTA.2016.42010
Abstract: 为实现同步系统中的信号相位同步,设计了一种基于FPGA的相位同步快速算法。在恒温晶振高精度低温漂的基础上,进一步实时测量恒温晶振频率,矫正后提供系统时钟,采用Verilog语言,算法中利用输入信号实时监听系统,使用的滑动平均滤波法,进一步使误差降低到5 ns。实验结果表明:结合FPGA的高速度,恒温晶振的高精度,该算法可以快速的精确的实现信号快速同步。此算法已在北斗/GPS授时同步系统中应用成功。
To achieve signal synchronization in synchronism system, an algorithm based on FPGA was de-signed to do it. On the basis of oscillator with high precision and temperature offset, further, the system measures its real-time frequency, then provides system with correctional clock. The utili-zation of glide average method and Real time monitoring system in algorithm in Verilog make error decrease to 5 ns. The experiment shows that: with the high speed of FPGA and the high precision of crystal oscillator, the algorithm makes signal synchronization quickly as well as accurately. The algorithm is applied to BeiDou and GPS synchronized clock system successfully.
The Technology To Prevent For Embezzling IP Address In Campus Network
校园网络中IP地址盗用与防范技术


计算机系统应用 , 2006,
Abstract: 在校园网络中若有两台主机IP地址相同,则两台主机相互报警,造成网络混乱.因此,IP地址盗用成了网管员最头疼的问题.当几百台、甚至上千台主机同时上网,如何控制IP地址盗用?
拟环纹豹蛛的生物生态学研究

昆虫学报 , 2007,
Abstract: 运用田间观察和室内外饲养相结合的方法,对稻田蜘蛛优势种拟环纹豹蛛Pardosapseudoannulata的生物生态学特性进行了研究。拟环纹豹蛛在湘西北1年发生2~3代,第3代不完整,以第2代历期最短,第3代(越冬代)历期最长;以成蛛、亚成蛛或幼蛛越冬,其分布图式为聚集分布;4月下旬即由田埂向稻田内迁移,在水稻生育期有3次数量高峰;属游猎型蜘蛛,可步行在水稻、水面、陆地等处捕食飞虱、叶蝉等多种目标害虫;受惊时潜入水中或潜伏。雌雄蛛均可多次交配,雌蛛一生最多可产卵5次,实验种群卵囊含卵量76~337粒,平均156粒。孵化的幼蛛,先群集在雌蛛背面,3~5天后开始扩散,6~7天扩散到高峰。幼蛛期47~158天;成蛛期121~236天,雌蛛较雄蛛长21~62天。性比除第2代外的各代均为雄性多于雌性。本文详细记述了拟环纹豹蛛的求偶与交配行为,产卵与护卵习性,孵化与携幼行为,幼蛛生长、蜕皮、各龄期形态特征及耐饥、耐旱能力等。
对学生肠道寄生虫病的综合防治措施探讨

中国公共卫生 , 1999,
Abstract: ?锦州地区连续8年对学生进行每年1次的集体驱蛔。蛔虫感染率已从1983年的城市47%下降到991年的22.74%,农村已从1983年的77.78%下降到39.57%。其效果与某些发达国家相比仍不理想(日本小学生蛔虫感染率为1.0%)。这是我们目前一个亟待解决的问题。现提出几点看法。
虎纹捕鸟蛛实验种群的生态观察

动物学杂志 , 2002,
Abstract: 对虎纹捕鸟蛛在人工饲养条件下的各种生态条件进行了多方面的实验、观察和分析。结果表明,该蛛对低温的耐受能力较差,对强光呈负趋性,土壤湿度最适范围为16%~22%,土壤pH值最适范围为5.1-5.5。对噪声敏感,具较强的耐饥力和相互残杀习性。
下雨还是下雪?

气象 , 1976, DOI: 10.7519/j.issn.1000-0526.1976.02.016
Abstract:
畦灌水流运动的一个数学模型

西北农林科技大学学报(自然科学版) , 1987,
Abstract: 本文提出了推算畦灌水流推进过程的一个数学模型。田间试验表明,该模型的平均误差小于4%,最大误差小于10%。根据这个模型,文中还提出了计算改水成数和畦长的公式。
系统性疾病唇部损害的诊断及临床处理
Diagnosis and clinical treatment of labial injury of systemic diseases


- , 2018, DOI: 10.7518/gjkq.2018.02.001
Abstract: 摘要: 口腔黏膜病变是多种系统性疾病的常见表征,其中部分疾病可主要或者特异性地累及唇黏膜及唇周皮肤,因此本文对此类主要累及唇和唇周的疾病进行综述,以指导临床医生详细询问病史并完善相关检查,准确判断唇部病损产生的病因,从而收到更好的治疗效果。
Abstract: Oral mucosa lesions are the common manifestations of a variety of systemic diseases, some of these diseases can be major or specific skin involvement lip and around the lips, so this paper reviewed the main systemic diseases affected lip and around the lips, in order to guide the clinical doctor get a thorough history and physical examination, then to accurately determine the etiology of lip lesion, and receive better treatment effect.
中图分类号
以MIDAS模型探讨亚洲股票市场的期望报酬与风险之关联
Using the MIDAS Model to Investigate the Relationship between Expected Return and Risk in Asian Equity Markets
 [PDF]

铭杰,
Service Science and Management (SSEM) , 2016, DOI: 10.12677/SSEM.2016.54B003
Abstract:
本文使用混和数据抽样(MIDAS, mixed data sampling)模型,探讨亚洲主要股票市场的期望报酬与风险之间的抵换关系,经由观察每日市场报酬的波动,给予适当且弹性的权重,来估计每月的条件变异数,并与使用每月报酬数据做为条件变异数基础的ARCH模型相比较,检定何种模型较能够解释期望报酬与风险的正向关系。本文实证结果得到,使用MIDAS模型有较多股票市场能得到正向的结果,表示能有效衡量期望报酬与风险之间的关系。然而,就模型配适度而言,ARCH模型对市场报酬的预测误差少于MIDAS模型,故MIDAS模型的使用仍有所限制。
We used the MIDAS (mixed data sampling) model to investigate the risk and expected return trade-off in major Asian equity markets. The optimal and flexible weighted of lagged daily squared market returns were adapted as the variance estimator to predict the monthly variance. In terms of the ARCH model that adapts the monthly squared returns as the variance estimator, we examined which model has greater statistical power to explain the positive relationship between risk and expected return. Our results proved that the MIDAS estimator had the ability to find more markets that had the positive and significant relationships. However, the pricing errors of the ARCH model were less than the MIDAS model, when we considered the fitness of the models. This evidence suggested that the MIDAS model cannot outperform the ARCH model in predicting market return.
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