A Polynomial Complexity Optimal Multiuser Detection Algorithm Based on Monotonicity Properties

An optimal multiuser detection algorithm with a computational complexity of O(K log K) is proposed for the class of linear multiple‐access systems which have constant cross‐correlation values. Here the optimal multiuser detection is implemented by searching for a monotone sequence with maximum likelihood, under the ranking of sufficient statistics. The proposed algorithm is intuitive and concise. It is carried out in just two steps, and at each step only one kind of operation is performed. Also, the proposed algorithm can be extended to more complex systems having more than a single cross‐correlation value.     

特殊教育学校综合实践活动课程实施情况分析

新一轮课程改革的一个亮点是综合实践活动课程的实施，由于综合实践活动课具有其特殊性，所以在实施过程中会遇到各种问题，特别是在特殊教育学校，诸多方面的问题制约着综合实践活动课的开展。本文通过对部分特殊教育学校的调研，了解到在实施过程中的问题并进行了分析，同时提出了一些应对策略。     

A fuzzy screening model for multiple attribute decision-making

A method for the screening of multiple attribute decision-making problems is presented. The model assists the decision-maker in eliminating inferior alternatives and insignificant attributes prior to a detailed evaluation. A preliminary evaluation of the alternatives provides the information necessary for the reduction of the decision problem. The procedure calculates maximum preference factors on which the decision-maker can base his screening decisions. These factors assess the role of alternatives in the final ranking by estimating their potential to become superior to other alternatives. Since screening tasks are carried out early in decision-making, the information available is generally uncertain. Uncertainty is represented in the model using fuzzy sets. This framework permits the handling of both imprecise and precise (crisp) estimates of impacts and provides a possibil-istic assessment of the risk associated with screening decisions.     

On multiple portmanteau tests*

Abstract. The portmanteau statistic based on the first m residual autocorrelations is used for diagnostic checks on the adequacy of fitting a model with varying m. In this article, we propose an approximation of the joint probability of multiple portmanteau tests with different degrees of freedom (DF). This distribution is easy to compute when all DF are even integers; its empirical behaviour is clarified in terms of asymptotic theory.     

市政工程建筑安全生产现状分析与管理措施

结合我国当前市政工程建设,具体阐释了建筑安全生产现状,并针对安全管理存在的问题提出了相应的对策,以期为加强建筑安全生产管理提供有益的借鉴。     

谐波反应法在计算自保温墙体负荷时的分析与评价

通过傅里叶变换,采用谐波反应法计算并分析建筑自保温墙体的对温度波和热流波的响应,结合墙体的衰减倍数和延迟时间可以获得新型自保温墙体的热稳定性,从而为建筑自保温墙体的热稳定性优劣提供理论依据;根据自保温墙体自身的一些不足,提出了相应的改进措施,从而可以更好的优化并普及这类新型建材。     

煤样多元物性参数在煤与瓦斯突出防治中的应用研究

煤与瓦斯突出是一种复杂的动力现象，突出的类型不同、引起突出的危险因素不同，预测指标对其的敏感性也就不同，选择适应的突出危险性预测敏感指标及突出敏感指标的临界值，研究可靠的突出预测手段和方法来实现对突出危险性的准确预测，是指导突出防治工作的重要技术基础，而为了获得突出敏感指标的临界值就必须对煤的多元物性参数进行实验研究，掌握煤层的各项物化性质，是有效确定防治突出方法体系的关键基础。     

Can land use regulations and taxes help mitigate vehicular CO2 emissions? An empirical study of Japanese cities

This study advocates a multi-dimensional urban planning strategy to help combat climate change under local—and not national—policies. However, the literature does not provide adequate guidance to local governments seeking to enhance urbanization and in turn reduce vehicular carbon dioxide (CO₂) emissions. Therefore, this study sheds light on the effects of the following four urban planning instruments on vehicular CO₂ emissions: urbanization promoting areas, urbanization control areas, urban planning taxes and property taxes. Using Japanese city-level data from 1990 to 2010, we find that the two urbanization area planning instruments and the urban planning taxes help lower emissions by increasing population density in low-density cities and that property taxes help reduce emissions in high-density cities. However, the increased population density associated with these instruments can lead to other negative outcomes, including increased traffic accidents, increased crime and a decrease in the facility condition index. City governments should consider complementary policies to mitigate such negative outcomes when employing planning instruments aiming to increase population density.     

多孔球三相流化床流动特性研究

对多孔球为团相的三相流化床流动特性进行初步研究．讨论气体空塔流速、液体喷淋密度、填料静止高度等因素时多孔球作团相的三相流化床流动特性的影响．根据实验数据，用微机回归得最小流化速度、床层压降、床层膨胀高度的计算公式．并和空心圆球为团相的三相流化床流动特性作了比较．     

经济区水资源优化分配的多目标投入产出模型

本文分析了经济区水资源优化分配的特点,论述了经济区水资源优化分配应在保证国民经济稳步协调发展的前提下进行,在此基础上建立了相应的经济区水资源优化分配的多目标投入产出模型,并探讨了模型的求解方法。