为了解决在基于聚类方法的WiFi指纹定位中视角单一所导致的定位精度较低的问题,提出了基于多视角聚类的WiFi指纹定位方法.利用阈值-均值滤波方法对原始数据进行处理;结合K-means聚类算法对多视角信号(信号强度和位置)进行区划,并建立离线指纹库;使用基础分类器对实测信号分类,待测信号依据分类结果在其所属区域内估计K个邻近信号点,用近邻以及相应的权重值综合确定该信号的实际位置.通过对比实验分析可知,在考虑多视角的情况下,WiFi指纹定位精度在4 m以内的概率为83％,相比于单视角聚类的定位精度提高了12％.结果表明,该方法提高了定位精度,也为定位领域的研究提供了多元化思路.

在温度为(20±2)℃、相对湿度为(40±3)％的环境条件下,采用试验方法研究了织物在不同摩擦次数下产生的电荷量的多少,重点研究了窗帘与金属、玻璃、其他织物的摩擦,以反映窗帘等织物表面在实际生活中的可能带电的大小,为研究静电对颗粒物在织物表面上沉积的影响提供数据支撑.结果表明:织物摩擦所产生电荷量主要由织物的材质、结构特点和摩擦功决定;织物上所带电荷量的大小与摩擦次数呈对数函数关系或常函数关系;在(40±3)％相对湿度情况下,涤纶窗帘在日常生活中产生的电荷量面密度为0.109μc/m2～2.19 μ c/m2.

Aiming at the 2-adic complexity of Sidelnikov-Lempel-Cohn-Eastman sequences,autocorrelation function value of this kind of sequence was obtained by using the cyclotomic number.Based on the relationship between 2-adic complexity and autocorrelation function,properties of 2-adic complexity value were analyzed.According to the greatest common divisor between the autocorrelation function value and the period of SLCE sequence,the condition that the 2-adic complexity of a SLCE sequence reaches its maximum value was given.The results show that 2-adic complexity of SLCE sequence on many finite field can reach the maximum value.

给出的求解线性方程组基础解系或通解的方法是一种直接构造的方法,不用回到同解方程组,而是通过初等行变换一气呵成,直接写出基础解系或通解.方法简单,易于学生掌握.

发现了Fermat数和由单圈T函数生成的极大周期序列的关系,利用Fermat数的素性理论研究了单圈T函数生成的第k位序列,按状态输出序列的2-adic复杂度取值和界.结果表明,单圈T函数序列生成的这2种序列不能形成l序列.

以2017年全国硕士研究生招生考试数学科目一道极限试题为例,利用换元、连续函数性质、洛必达法则等方法给出该类型题目的一题多解法,拓展极限计算解题思路.

为使学生更好的理解多元函数八种积分的概念、性质、计算方法以及这几种积分之间的关系,改革课堂教学内容,将这几种积分分为两类讲解,并在课程结束时进行教学效果问卷调查.结果表明,新的教学内容组织方式的确更有利于学生理清知识点之间的联系,更易抓住几种积分的本质.

In order to realize the dynamic database of extended field properties of demand, a combination of NoSQL and rela-tional database schema design. The design mainly extended NoSQL good for relational database properties in the horizontal ex-pansion of its architecture, main method of using an additional layer of assisted NoSQL stored in relational database schema on the original, can complete the dynamic extension of the field properties. Practical application shows that, this design model has the features of easy to understand, easy to implement, has achieved the design requirements.

Properties of H-matrices were discussed,the structures of H-symmetric and H-antisymmetric matrices were given,and it was proven that when x was an eigenvector of H-symmetric matrices or H-antisymmetric matrices A-λB,x would be either an H-symmetric vector,or H-antisymmetric vector,or x could be expressed by linear combination of H-symmetric vector with H-antisymmetric vector.Based on above-mentioned feature of eigenvector of A-λB,the expression of solution to inverse problem AX=BXΛ of generalized eigenvalue of H-symmetric matrices and H-antisymmetric matrices were obtained.

Through the theory of fuzzy ideas,locally U-abundant subsemigroups of U-abundant semigroups and locally U-superabundant semigroups are given in this paper.

Anti-idempotency of linear combinations of anti-idempotent matrices are investigated. A result that diagonalization matrices are expressed to linear combinations of antiidempotent matrices is given. Also, we obtain a pathway of constructive anti-idempotent matrices of pairwise commutaive and orthogonal.

A U-semiabundant semigroup is a generalization of an abundant.It is proved that if S is a U-semiabundant semigroup satisfying PC conditions in which the set of projections forms a subsemigroup,then the nature partial order on S is compatible.If eSe satisfy the regularity condition and L~V-unipotent,R~V-unipotent,and if S is compatible,then eSe satisfy the regularity condition and L~V-majorization and R~V-majorization.

The problem of diagonalization of linear combinations of quaternion skew-idempotent matrices was investigated.It was pointed out that the quaternion matrices which could be diagonalized,could be expressed as linear combinations of quaternion skew-idempotent matrices.And a similarity transformation matrix was constructed for the similarity transformation of quaternion skew-idempotent matrices to diagonal matrices.

The concept of congruence pair on S is introduced,where S is a nil-extension of a Clifford semigroup K.It is shown that every congruence σ on such a semigroup S can be uniquely represented by a congruence pair on S.It is also proved that there is an order-preserving bijection Γ∶σ→(σQ,σk) from set of all congruences on S onto the set of all congruence pairs on S.

A principal right projective (rpp in short) semigroup is important in the class of generalized regular semigroups. The concept of a primitive rpp semigroup is first introduced. Some basic properties of primitive rpp semigroups were investigated by using the Green(l) -relations:L(l),R(l),H(l) and D(l) and proved if a is a non-zero element of a primitive rpp semigroup S,s∈S and Ra(l)∩E(S)≠Φ ,then as∈Ra(l)∩LS(l).We also showed thatH ef(l) and H fe (l) are left cancellative subgroup of S without identity, and H ef(l)is isomorphic as a semigroup and as a right H f(l)-system to a right ideal of H f (l), is isomorphic as a semigroup and as a left H e(l)-system to a left ideal of H e (l) in a primitive rpp semigroup.

China is a civilized archaic nation,and,as a part of Chinese culture,ancient pagoda holds an important status in the developing history of nation architecture.With the rapid developing of the nation,we have the ability to identify and strengthen the pagoda.This article has introduced the survey and progress of rectification projects about the ancient pagoda at first,carried on the narration about each kind of rectification plans,proposed the rectification idea of grout injection—relieves the stress method and concrete measures of the plan.

The mechanical behaviors of a new function material-shape memory alloy(SMA) is discussed.Its characteristics and constitutive relation as well as its application in engineering are reviewed in this paper.The application problems and improvement method are also briefly introduced.