Analysis of the “Hiring Above the Median” Selection Strategy for the Hiring Problem

This paper gives a precise mathematical analysis of the behaviour of “hiring above the median” strategies for a problem in the context of “on-line selection under uncertainty” that is known (at least in computer science related literature) as the “hiring problem”. Here a sequence of candidates is interviewed sequentially and based on the “score” of the current candidate an immediate decision whether to hire him or not has to be made. For “hiring above the median” selection rules, a new candidate will be hired if he has a score better than the median score of the already recruited candidates. Under the natural probabilistic model assuming that the ranks of the first n candidates are forming a random permutation, we show exact and asymptotic results for various quantities of interest to describe the dynamics of the hiring process and the quality of the hired staff. In particular we can characterize the limiting distribution of the number of hired candidates of a sequence of n candidates, which reveals the somewhat surprising effect, that slight changes in the selection rule, i.e., assuming the “lower” or the “upper” median as the threshold, have a strong influence on the asymptotic behaviour. Thus we could extend considerably previous analyses (Krieger et al., Ann. Appl. Probab., 17:360–385, 2007; Broder et al., Proceedings of the 19th Annual ACM-SIAM Symposium on Discrete Algorithms (SODA), pp. 1184–1193, ACM/SIAM, New York/Philadelphia, 2008 and Archibald and Martinez, Proceedings of the 21st International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2009), Discrete Mathematics and Theoretical Computer Science, pp. 63–76, 2009) of such selection rules. Furthermore, we discuss connections between the hiring process and the Chinese restaurant process introduced by Pitman (Combinatorial Stochastic Processes, Springer, Berlin, 2006).     

Status Quo Analysis and Development Strategy of Venture Capital In China

ConsultationNo.oneproposalondevelopmentofChineseVenturecapital.Sincethen,moreandmorealtentionshavebeenpaidtoitrapidly.AndtherehavecomeovernightmanyVenturecapitalcompanies(funds)andVenturecapitalagents.WhatphrasehasChineseVenturecapitaldevelopedinto?Howisitsoperation?Whatkindofmarketconditionisneededtodevelopit?Inordertoanswerthesequestions,westartedarelativeall-sidedresearchofChineseVenturecapitalstatusquoinAril,1999.Duringthisresearch,wevisited85Veniurcapitalcompaniesin15Chineselargorme…     

A Review of “Hiring,Training, and Supervising Library Shelvers”

Abstract

The emergence of the Internet has dramatically changed information access capabilities through computers. Tools and resources available on the Internet affect library services in various ways. Many health science librarians are using Internet resources to meet the information needs of health care providers and themselves. This study examines different applications of the Internet components in medical library settings with a special emphasis on reference services. It also discusses the role of the Internet in fulfilling National Network of Libraries of Medicine's (NN/LM) objectives and analyzes the merit and demerits of using the Internet as a reference tool in health sciences libraries.     

On Interrupt Strategy from the Point of View of System Efficiency

Interrupt strategy of an operating system can help computer to tackle with urgent orimportant events,and to run programs in a reasonable fashion in order to achieve a satisfactoryperformance.But a sophisticated strategy will cause an amount of system costs.In this paperwe introduce the concept of “layered interrupt priorities”which will care both the system costsand the response capability.This strategy can be applied in timesharing systems,realtimesystems,or multiprocessor systems.At the end of the paper we exploit the advantages of thisstrategy using data acquired by simulation of a real computer system.     

Analysis of the “Toolkit” Method for the Time-Dependent Schrödinger Equation

The goal of this paper is to provide an analysis of the “toolkit” method used in the numerical approximation of the time-dependent Schrödinger equation. The “toolkit” method is based on precomputation of elementary propagators and was seen to be very efficient in the optimal control framework. Our analysis shows that this method provides better results than the second order Strang operator splitting. In addition, we present two improvements of the method in the limit of low and large intensity control fields.     

Best Power UPS“赶场”

3月31日,美国Best Power公司推出了其UPS电源系列产品。BEST UPS电源系列从2KVA到2700KVA,均采用绝缘栅双极型晶体管(IGBT)技术,提高了机器的可靠性和逆变效率。 BEST UPS电源使用全数字控制的方式,通过机器内的CPU进行数字控制,可对多达100个UPS内部参数进行编程控制,智能显示面板可以方便地显示UPS工作状态,用户通过面板就可对UPS所有的运行参数进行在线修改和调整。 BEST UPS的实时监控功能可以对UPS电源系统的模拟量参数进行实时采样,并通过高速模拟转换技术来实现数字式监控。其自测试、自诊断功能可对UPS电源内部逻辑控制电路的运行状态进行实时检测和诊断,它可利用机内的微处理器同时对UPS电源的控制部件进行总数达140个以上的关键点进行自诊断监控。用户还可通过可编程软件按实际运行工作的需要,来重新设置UPS内     

Concerning the Analysis of 2 × 2 Tables

Recent papers (R. M. Engeman and G. D. Swanson, 1991, Comput. Biomed. Res.24, 509; M. R. Massai and P. Barbini, 1993, Comput. Biomed Res.26, 98) have expressed concern regarding differences in results among statistical methods of hypothesis testing for 2 × 2 contingency tables. These papers did not present current statistical thought on this topic, and they did not discuss measures of effect for such analyses. In this paper statistical literature on the 2 × 2 contingency table is presented and philosophical issues underlying the methods discussed. Measures of effect appropriate for several data origins or designs which result in 2 × 2 arrays are also presented. The paper presents an empirical adjustment to the Fisher's exact test known as the mid-P approach. The information should help provide the user of statistics a belief understanding of the analysis or 2 × 2 tables, An example using data front Engeman and Swanson (1991) is provided, and some recommendations for the analysis of 2 × 2 tables are given.     

Analysis of the PSPG method for the transient Stokes’ problem

We propose a new analysis for the PSPG method applied to the transient Stokes’ problem. Stability and convergence are obtained under different conditions on the discretization parameters depending on the approximation used in space. For the pressure we prove optimal stability and convergence only in the case of piecewise affine approximation under the standard condition on the time-step. Finally we show that the stability problems of the PSPG-method can be circumvented using an appropriate discrete reconstruction of the Laplace operator.     

Convergence Analysis in the Maximum Norm of the Numerical Gradient of the Shortley–Weller Method

The Shortley–Weller method is a standard central finite-difference-method for solving the Poisson equation in irregular domains with Dirichlet boundary conditions. It is well known that the Shortley–Weller method produces second-order accurate solutions and it has been numerically observed that the solution gradients are also second-order accurate; a property known as super-convergence. The super-convergence was proved in the \(L^{2}\) norm in Yoon and Min (J Sci Comput 67(2):602–617, 2016). In this article, we present a proof for the super-convergence in the \(L^{\infty }\) norm.     

New Analysis of the Du Fort–Frankel Methods

In 1953 Du Fort and Frankel (Math. Tables Other Aids Comput., 7(43):135?C152, 1953) proposed to solve the heat equation u _t =u _xx using an explicit scheme, which they claim to be unconditionally stable, with a truncation error is of order of $\tau= O({{k}}^{2}+{{h}}^{2}+\frac{{{k}}^{2}}{{{h}}^{2}})$ . Therefore, it is not consistent when k=O(h). In the analysis presented below we show that the Du Fort?CFrankel schemes are not unconditionally stable. However, when properly defined, the truncation error vanishes as h,k??0.     

What is the Right R&D Strategy for Overcoming the Difficulties of the South Korean IT Industry?

This study proposes new strategies for the information technology (IT) industry in South Korea, provides objectives for the South Korean IT industry and articulates the roles of the Korean government agencies, companies and users. Specifically, it covers South Korean IT strategies employed during several periods, including a stagnant period and a more recent period reflecting new successful IT environments of developed countries. South Korean IT companies should recognize the importance of user interface and user experience technologies as a next key global IT industry trend. Raising this awareness is critical in increasing the global competitiveness of the Korean IT industry. Furthermore, South Korean government agencies should take more active role in constructing and improving interactive environments that would benefit both companies and users. For future research, it is imperative to investigate the specific roles of companies, users and government agencies with respect to IT usage.     

Analysis of Different Hypotheses about the Geometric Pattern of the Pantheon’s Coffered Dome

This paper analyzes various hypotheses about the geometric pattern and setting out of the coffers of the Pantheon’s dome. The analysis is approached from the designer’s viewpoint to reveal possible methods and procedures, as well as the hypothetical assumptions and design intentions. The main hypothesis is that the designer of the coffered vault sought a geometric pattern of the coffering so that it could be perceived by the human observer as having the shape most similar to a regular squared grid with each coffer appearing to be a perfect square. The analysis also extends to the hypothetical tracing corrections to improve the perspective perception of ribs and coffers.     

The Analysis and Solution for the Connection of GPRS Modem

This paper proposes the principle of GPRS, the realization of GPRS modem and how to embed the TCP/IP protocols. Then we describe some problems that happen when the GPRS modem is on-line, and give some ways to solve them at last.     

Does the user behavior effect the productivity of hammer drilling? – Analysis of the influences of feed and lateral force

The objective of this study was to investigate the relationship between feed and lateral force with productivity in hammer drilling. Necessary user forces and vibration caused by hammer drilling leads to user fatigue and long-term injuries. Through an increase in productivity, the stress duration and thus injuries caused can be reduced. The user, who influences productivity, applies lateral forces in addition to the feed force during hammer drilling. Their influence and interaction with the feed force on productivity has not yet been investigated. In this study, a total of 1152 boreholes were performed on an automated test bench. Along with the feed and lateral forces, the setup, consisting of hammer drill and drill bit model, was varied in order to investigate interaction effects as well as discuss transferability of the findings. The productivity was evaluated by the rate of penetration (ROP). It was observed that the ROP decreased with increasing lateral forces (p < .001, r = 0.315) and increased with increasing feed force. The detailed courses of these relationships were setup-specific. At low feed forces, the feed and lateral force interacted on the ROP. The investigated relationships indicate an efficient operating range depending on the user forces and setup used, which enables a reduction of the user's stress duration. The findings help engineers develop power tools that provide more efficient and hence less fatiguing work, making them more ergonomic for the user.     

Robustness Analysis of the IFN-ν Induced JAK-STAT Signaling Pathway

Here, the issue of robustness analysis of cell JAK-STAT signal transduction networks is addressed. This is investigated upon a mathematical model of IFN-γ induced JAK-STAT signaling pathway by applying robustness analysis which is based on a broad range of simultaneous and systematical parameters variation. The effects of the variations of the initial signal proteins' concentrations on the output of this system are also studied. The study demonstrates that the JAK-STAT signaling pathway is robust with respect to its "signal time" and "signal duration", but sensitive with respect to its "signal amplitude". These analysis results can point to experimental designs that can further test how the pathway activity can be perturbed.     

Analysis of the Earthʼs magnetic field variations on the basis of a wavelet-based approach

In the present paper we will discuss a new wavelet-based approach aimed at processing and analyzing different features of complex geomagnetic signals. This approach makes it possible to automatically extract different kinds of disturbances in the Earth?s magnetic field variations, which characterize solar activity and help to predict magnetic storms. In order to analyze geomagnetic signals wavelet packets are used in order to isolate local variations for quiet and perturbed periods and determine their intensity. Furthermore, a new automatic method of calculating the index of geomagnetic activity K is suggested on the basis of forming a quiet-day diurnal variation (Sq-curve). This method allows us to do calculations in the way that is closest to that developed by J. Bartels, who introduced the K-index in 1938. The results are compared with those obtained by INTERMAGNET and the original method of J. Bartels and the advantages of the suggested method are clearly demonstrated. For geomagnetic data collected in high-latitude regions of our planet it has become possible to reduce the error of estimating the K-index by 20% and unlike the technique used by INTERMAGNET here all the calculations can be done automatically. We will use geomagnetic signals that were kindly provided to us by the Institute of Cosmophysical Research and Radio Wave Propagation (Paratunka, Kamchatka region, Far East of Russia) for the period from January, 2002 till December, 2010.     

The metamorphoses of the “Exemplar”

The starting point of this work isthe artificial, as defined in a previous study by Massimo Negrotti and, more completely, in the essay presented here, as a machine which reproduces the essential performance of some natural subsystem that serves as an exemplar, at a chosen level of observation. I assume also Negrotti's distinction between the technology of the artificial and conventional technology. These theoretic assumptions, and the relevant terminology, represent here the starting point for a reflection upon the process of imitating the natural exemplar and ofideating the technological object, and upon the interrelations between these two moments of inventiveness.     

Analysis of the Relation between Ground Electric Field and the First Lightning Strike

Based on the changing curves of ground electric field during surveying the thunderstorm on the spot, the threshold of ground electric field that triggers the first lightning strike is analyzed. The qualitative mathematical expression, which shows that the threshold of ground electric field changes regularly with some environment factors such as altitude and ground dielectric constant, is proposed. The critical evaluation of the ground electric field is applied in smart power supply of wireless access base station to carry on lightning forecast experiments. The perfect results are achieved, which provide favorable experimental references for the study of lightning forecast.