This paper uses a questionnaire to find out that the cognitive ability of higher vocational college students in English prefabricated chunks is weak, and there are many problems such as insufficient knowledge reserve weak awareness their use. The aim develop students’ learning habits memorizing, understanding, applying transferring language with smallest unit.

In extreme value theory, the so-called extreme-value index is a parameter that controls the behavior of a distribution function in its right tail. Knowing this parameter is thus essential to solve many problems related to extreme events. In this paper, the estimation of the extreme-value index is considered in the presence of a random covariate, whether the conditional distribution of the varia...

An understanding of the spatial dimension of economic and social activity requires methods that can separate out the relationship between spatial units that is due to the effect of common factors from that which is purely spatial even in an abstract sense. The same applies to the empirical analysis of networks in general. We are able to distinguish between cross-sectional strong dependence and ...

The chaining problem is deened as follows. = maxfj j a j = 1; j < ig. (Deene maxfg = 0) The chaining problem appears as a subproblem in many contexts. There are algorithms known that solve the chaining problem on CRCW PRAMs in O((n)) time, where (n) is the inverse of Ackerman's function, and is a very slowly growing function. We study a class of algorithms (called oblivious algorithms) for this...

Mutation testing is a fault-based technique for unit level software testing. Weak mutation was proposed as a way to reduce the expense of mutation testing. Unfortunately, weak mutation is also expected to provide a weaker test of the software than mutation testing does. This paper presents results from an implementation of weak mutation, which we used to evaluate the e ectiveness versus the e c...

The weak gravity conjecture suggests that, in a self-consistent theory of quantum gravity, the strength of gravity is bounded from above by the strengths of the various gauge forces in the theory. In particular, this intriguing conjecture asserts that in a theory describing a U(1) gauge field coupled consistently to gravity, there must exist a particle whose proper mass is bounded (in Planck un...

An understanding of the spatial dimension of economic and social activity requires methods that can separate out the relationship between spatial units that is due to the effect of common factors from that which is purely spatial even in an abstract sense. The same applies to the empirical analysis of networks in general. We are able to distinguish between cross-sectional strong dependence and ...

We propose a unified quasi-likelihood procedure for the estimation of the unknown parameters of a first-order random coefficient autoregressive, RCA, model that works both for stationary and nonstationary processes. For this procedure, the weak consistency and the asymptotic normality are established under minimal assumptions on the noise sequences. In an empirical study, we highlight the pract...

This paper considers estimation of the unknown function g() in the partial linear regression model Y i = X T i + g(T i) + " i with heteroscedastic errors. We rst construct a class of estimates g n of g and prove that, under appropriate conditions, g n is weak, mean square error consistent. Rates of convergence and asymptotic normality for the estimator g n are also established.