工程评估理论及其在矿业中应用的新进展

我国矿业工程评估一般采用折现现金流量法，但由于矿业工程投资期间长，价格波动大，因而常低估矿业工程的投资价值，为此，介绍了近年来基于期权定价技术发展起来的矿业工程评估方法及其在矿业工程中的应用。     

企业现金流量表及附注编制对应关系的探讨

在编制现金流量表及其附注时,有些企业容易忽略了4个对应关系,从而使现金流表项目所反映的内容与附注的调整事项产生差异。笔者对4个对应关系分别进行分析和探讨,期望引起足够的重视。     

Life cycle cost and energy analysis of a Net Zero Energy House with solar combisystem

The Net Zero Energy House (NZEH) presented in this paper is an energy efficient house that uses available solar technologies to generate at least as much primary energy as the house uses over the course of the year. The computer simulation results show that it is technically feasible to reach the goal of NZEH in the cold climate of Montreal. In terms of the life cycle energy use, which considers the operating and embodied energy of the house, the energy payback time is 8.4–8.7 years, when the NZEH is compared with an average house that complies with the provincial code. The energy payback ratio of the combisystem is 3.5–3.8 compared with the heating system of conventional house. By converting solar energy, the combisystem supplies at least 3.5 times more energy than the energy invested for manufacturing and shipping the system. The life cycle cost analysis of the NZEH shows, however, that due to the high cost of the solar technologies and the low cost of electricity in Montreal, financial payback is never achieved.     

A cash-constrained stochastic inventory model with consumer loans and supplier credits: the case of nanostores in emerging markets

We consider a small traditional retailer that is managing its inventory under strict cash constraints, mainly because typically informal loans are offered to customers. These stores are widely present in emerging markets, and we refer to them as nanostores (also called ‘mom-and-pop stores’). As the suppliers require immediate payments for goods delivered, a nanostore can only replenish products to the level for which it has on-hand cash available. To improve delivery efficiency, a supplier might offer a nanostore credit for its replenishments. However, currently, suppliers are often reluctant to do so as these nanostores quickly go bankrupt or disappear, hence defaulting on all outstanding credits. The objective of this paper is to determine when it is beneficial to offer supplier credits. We propose a multi-period, stochastic inventory model, and numerically compare scenarios with and without supplier credits. Our study shows that even in the presence of this risk, suppliers often have good incentives to provide these credits, even if interest is not incurred. For this to hold, the operations of the retailer should be (a little) profitable in the first place, for which we provide analytical conditions.     

Provably secure robust threshold partial blind signature

Threshold digital signature and blind signature are playing important roles in cryptography as well as in practical applications such as e-cash and e-voting systems. Over the past few years, many cryptographic researchers have made considerable headway in this field. However, to our knowledge, most of existing threshold blind signature schemes are based on the discrete logarithm problem. In this paper, we propose a new robust threshold partial blind signature scheme based on improved RSA cryptosystem. This scheme is the first threshold partial blind signature scheme based on factoring, and the robustness of threshold partial blind signature is also introduced. Moreover, in practical application, the proposed scheme will be especially suitable for blind signature-based voting systems with multiple administrators and secure electronic cash systems to prevent their abuse.     

基于现金流量综合分析法的现金流经营

在企业经营环境日趋复杂和资本市场衍生金融工具层出不穷的背景下，现金流经营越来越受到企业的重视，而传统的现金流经营模式存在很多不足，为此，本文以某化学工业股份公司为例，利用现金流量综合分析法在企业的现金流经营上做了一些讨论．     

一种改进的可控制匿名性的离线电子现金系统

利用RSA盲签名算法和Schnorr一次数字签名算法,对Juels的电子现金方案[1]做了改进,提出一个新的可控制匿名性的电子现金系统。在用户向商家支付电子现金时,用户利用自己的秘密密钥对其将要支付的信息进行数字签名,解决了原方案中TTP(可信第三方)能冒充用户去花费用户的电子现金、他人获得合法用户的电子现金可盗用的问题,而且TTP使用公钥数字签名算法对可信标记签名,进一步增强了系统的安全性。最后对系统的安全性进行了分析。     

从资金的"源"与"流"角度来强化高校资金管理

目前，高校为了适应知识经济发展的要求，出现了资金供给不足与需求扩大的矛盾，所以如何去加强资金管理，提高资金的使用效率已成为高校重要的研究课题，文中从高校资金循环的特殊规律入手，要求高校贯穿管理理念，把握资金的“源”与“流”，夯实高校现金基础，提高资金使用效率．     

一个具有隐私保护的数字产品匿名交易方案

密码及其相关技术是在电子商务中保护用户隐私的重要手段之一，基于数字签名技术，加密技术，以及匿名电子现金技术，提出了一种改进的数字产品网上交易方案，改进后的方案使用匿名的电子现金确保了用户在交易中的匿名性，进一步有效地保护了合法用户的隐私，此外，方案利用数字签名技术，以签名作为商家承诺，有效地解决了商家在交易中的恶意欺诈，如“以次充好，偷梁换柱”等问题。     

OKAMOTO电子货币分析与研究

本文简要综述了电子货币的发展研究过程，分析了Okamoto电子货币体系的特点， 剖析了一种攻击方法，对攻击方法做 出了理论分析，在此基础 上探讨了几种抵御攻击的方案，最后提出了一种改进的电子货币系统。