基于ITIL的医院信息服务管理流程的研究

ITIL的核心就是把IT与业务结合起来,是各行业IT服务管理的最佳实践指南[1]。因此,应用ITLT管理模型,建立医院信息服务管理流程,将医院信息服务流程化,提高信息部门的服务效率。本文结合安庆市立医院实际,针对信息服务管理中存在的问题,进行了讨论,发表了自己的一些看法。     

Exponentially weighted information criteria for selecting among forecasting models

Information criteria (IC) are often used to decide between forecasting models. Commonly used criteria include Akaike's IC and Schwarz's Bayesian IC. They involve the sum of two terms: the model's log likelihood and a penalty for the number of model parameters. The likelihood is calculated with equal weight being given to all observations. We propose that greater weight should be put on more recent observations in order to reflect more recent accuracy. This seems particularly pertinent when selecting among exponential smoothing methods, as they are based on an exponential weighting principle. In this paper, we use exponential weighting within the calculation of the log likelihood for the IC. Our empirical analysis uses supermarket sales and call centre arrivals data. The results show that basing model selection on the new exponentially weighted IC can outperform individual models and selection based on the standard IC.     

Optimality and efficiency of small chessboard designs for correlated errors

Optimal p × q row–column designs are obtained via complete enumeration of all possible designs for two treatments in some fixed effects models with errors specified by a doubly geometric covariance structure. This is done, in part, by a computer search, for a finite set of sizes of the correlation coefficients and in cases where p and q are small enough to make such a search feasible.     

Performance in Product versus Service Supplier Relationships

ABSTRACT

Today's rapidly changing and competitive marketplace has forced channel members to devote increased attention and resources to providing consumers with a seamless delivery of products and services. This seamless delivery occurs through social integrative relationships between channel members, supported by the application of information technology. Achieving integration is a difficult task that may vary based on whether a product or a service is involved. This paper proposes that manufacturer integrative relationships with product suppliers may develop with lower levels of seamless delivery when compared to manufacturer integrative relationships with service suppliers. Further, the paper discusses how the application of information technology may impact manufacturer-supplier relationships and performance.     

Gender Differences in Information Search and Comparison Shopping

Abstract

In entering the market of Central and Eastern Europe, it is important for marketers to understand how certain aspects of consumer behavior differs across consumer segments so that they can appropriately segment, target and position their products. A study was conducted to evaluate differences between males and females across the countries of Bulgaria, Hungary and Romania in terms of their information search and comparison-shopping behavior. The study also advanced a conceptual model that explains the effect of nationality and gender differences on information search and comparison shopping.     

如何提高科技查新质量的对策研究

文章介绍了科技查新工作的概况及现阶段所面临的各种问题,并重点就如何提高查新质量进行了探讨。     

List price signaling and buyer behavior in the housing market

To determine whether list price contains useful information for anticipating trends in eventual transactions prices, we develop a model of buyer behavior from a search-theoretic perspective. Using data from the Baton Rouge, Louisiana, housing market between 1985 and 1992, we estimate separate price indexes with list price and selling price as the respective dependent variables in the hedonic regressions. Consistent with our theory, we find that the list price may lead the market when functioning as a signal of seller intent, but list price will probably lag a market driven by buyer willingness to purchase. Granger causality tests conducted on quarterly data for the eight-year study support listing price as a leading indicator of selling price. However, an examination of the indexes around the period of market reversal suggest otherwise. Indeed, listing prices appear to contain the least useful information at the times when information would be most valuable: at the peaks and troughs of the market cycle.     

Finite allocation mechanisms: approximate Walrasian versus approximate Direct Revelation

Summary. This paper obtains finite counterparts of previous results that showed the informational efficiency of the Walrasian mechanism among all mechanisms yielding Pareto-optimal individually rational trades in exchange economies while using a continuum of possible messages. In particular, we develop finite counterparts of the superiority, with respect to message-space dimension, of the Walrasian mechanism over Direct Revelation (DR). We measure a finite mechanism's cost by the number of its (equilibrium) messages. Our two main results are as follows: (1) For exchange economies we find that the overall (maximum) error of a (sufficiently fine) approximate Walrasian mechanism is less than the overall error of a not-more-costly approximate DR mechanism whose equilibrium outcomes are trades that are (approximately) Pareto optimal and individually rational; more generally, approximate Walrasian mechanisms are superior, in the same sense, to approximations of any continuum mechanism whose outcomes are Pareto optimal individ ually rational trades and whose message space has higher dimension than that of the Walrasian mechanism. (2) As we increase without limit the dimension of the set of environments (characteristics) defining our class of exchange economies, the extra cost of DR approximations relative to Walrasian approximations, when both achieve the same overall error, also grows without limit. Thus the informational superiority of the Walrasian mechanism emerges again when we approximate it and take the finite number of messages in the approximation as our cost measure. Received: June 16, 2002; revised version: July 22, 2002 RID="*" ID="*" The second author is grateful for support from National Science Foundation grant #IIS-0118600. Correspondence to: T. Marschak     

银行信息披露制度与银行系统稳定性研究

建立商业银行信息披露制度是我国金融改革中较重要的一环,一般的认识是信息制度的建立将使金融机构运作更审慎,有利于提高整个金融系统的稳定性;但本文通过博弈模型证明:赋予我国商业银行国家信用与进行信息披露制度之间存在着一定的冲突,目前我国对金融体系的过度保护反而会降低商业银行信息披露的对银行体系稳定性的改进,合适的改革次序应是国家信用在金融机构中的先行退出也即建立一个合适的存款保险制度,其次才是规范的信息披露制度的建立.     

Analysis of intraday herding behavior among the sector ETFs

A body of literature has emerged suggesting that investors herd, or tend to make investment decisions on the basis of information provided by the trades of other market participants. In this paper, we use intraday data to examine whether traders herd during periods of extreme market movements using sector Exchange Traded Funds (ETFs). Two procedures, one based on identifying extreme up market and down market periods and the other based on incorporating a nonlinear term in a regression specification, are used to identify the possibility of the existence of herding behavior in nine sector ETFs traded on the American Stock Exchange. The results support the conclusion that investors do not herd during periods of extreme market movements using ETFs. Furthermore, we show that the market reaction to news is not symmetric for up markets and down markets.