基于IOS平台塔防游戏的设计与实现

目前随着我国3G网络的快速发展,智能手机的市场也日益扩大,其中最受欢迎的莫过于苹果公司生产的iPhone手机。本文介绍基于IOS平台的拥有良好操作性及娱乐性的小型塔防游戏开发过程。该游戏是运用Cocos2d引擎以及Xcode进行开发的,不仅实现了塔防游戏的基本对战功能,还增添了场景选择,音效设置等功能,游戏界面唯美,动画效果精彩,为手机游戏开发提供了参考。     

国有企业多层委托—代理关系下的激励机制分析

文章分析了在国有企业多层委托—代理关系下,各利益主体的权责利关系和他们的收益与企业绩效的关联度,并在此基础上建立了多层代理的激励模型。     

Interest rates and the recent weakness in M2: An extension to the P model of inflation

A model of changes in the deflator for nondurables and services consumption expenditures is estimated simultaneously with the error-correction model of M2 growth described in Koenig (1996). The inflation forecasts generated by the joint model have marginal predictive power for changes in the GDP deflator and exhibit none of the systematic bias which has plagued the original formulation in recent years. Output-market slack is of little use in predicting changes in the consumption deflator, but there is evidence of a speed effect.     

新舟700飞机DMC分析

直接维修成本(DMC)是飞机维修成本,也是反映飞机自身经济性的主要指标之一,开展飞机维修成本研究对于新舟700飞机研制至关重要。然而,由于国内民机发展相对落后,型号研制缺乏数据积累,研究新机研制初期维修成本的控制目标困难较大。文章通过分析与新舟700飞机类似机型维修成本的修正得到DMC目标值。     

Economic juries and public project provision

Juries charged with evaluating economic policy alternatives are the focus of this study. The recruitment and management of juries is a principal-agent problem involving the design of incentive mechanisms for participation and truthful revelation of values. This paper considers a simple general equilibrium economy in which juries of consumers are used to estimate the value of public projects and determine their provision. The impact of participation fees on jury selection and representativeness, and on statistical mitigation of response errors, is analyzed. Manski set identification is used to bound selection bias and determine participation fee treatments that minimize welfare regret from imperfect jury findings.     

BIBD循环置换矩阵的多进制LDPC码构造

提出了基于均衡不完全区组设计（Balanced Incomplete Block Design,BIBD）的 多进制准循环LDPC（Low Density Parity Check）码代数构造方法。在该构造方法 中提出了广义多进制位置向量的概念,并根据广义多进制位置向量和BIBD法对指数矩阵进行 广义二维扩展,构造出具有循环置换子矩阵的多进制校验矩阵,由此得到girth不小于6的多 进制LDPC码。仿真结果表明,采用FFT-QSPA（基于快速傅里叶变换的多进制和积算法）对构 造出 的LDPC码进行译码,在AWGN信道下相比 于同参数的RS码来说可以取得明显的编码增益,并且优于多进制Mackay码。     

Tourism and information technologies

The apparent mismatch between tourism and technology can be reconciled by a closer examination of the tourism production system (TPS) and the technologies likely to affect it. It is found that a whole system of information technologies (SIT) is being adopted by all segments of the travel industry. The SIT, however, will not attack the human content of tourism. Rather, it will affect the core information-intensive areas of management, organization, product blending and packaging, marketing, distribution and industry linkages. Factors likely to affect the diffusion of the SIT in tourism are identified. Implications of technology adoption for future organization, management, and distribution of tourism services are drawn out.     

个人所得税对公司加权平均资金成本的影响

本文利用Dempsey的包含个人所得税的股票价值模型建立了包含个人所得税的公司平均资金成本模型,研究个人所得税对公司资本结构和资金成本的影响.本文还根据中国的实际,研究中国现行的所得税制度对公司资金成本和资本结构的影响.     

物质能量循环与城市环境保护和建设

正确认识水和磷的循环作用及其丰度和效益,开发得当,将为环境保护和建设发挥出巨大的作用,反之,也可能产生负面的影响,文章以千岛湖畔淳安县为例,生动地阐明一个地区的物质能量循环和生物自然净化作用对城市环境保护和建设的相互作用。