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| 1 | Dependent-Chance Programming Models for Capital Budgeting in Fuzzy Environments显示文摘Capital budgeting is concerned with maximizing the total net profit subject to budget constraints by selecting an appropriate combination of projects. This paper presents chance maximizing models for capital budgeting with fuzzy input data and multiple conflicting objectives. When the decision maker sets a prospec-tive profit level and wants to maximize the chances of the total profit achieving the prospective profit level,a fuzzy dependent-chance programming model,a fuzzy multi-objective dependent-chance programming model,and a fuzzy goal dependent-chance programming model are used to formulate the fuzzy capital budgeting problem. A fuzzy simulation based genetic algorithm is used to solve these models. Numerical examples are provided to illustrate the effectiveness of the simulation-based genetic algorithm and the po-tential applications of these models. | 梁锐 高金伍 | 2008 | Tsinghua Science and Technology2008，13，1： | 2 |
| 2 | Study on the radiation problem caused by electron beam loss in accelerator tubes显示文摘The beam dynamic code PARMELA was used to simulate the transportation process of accelerating electrons in S-band SW linacs with different energies of 2.5,6 and 20 MeV.The results indicated that in the ideal condition,the percentage of electron beam loss was 50% in accelerator tubes.Also we calculated the spectrum,the location and angular distribution of the lost electrons.Calculation performed by Monte Carlo code MCNP demonstrated that the radiation distribution of lost electrons was nearly uniform along the tube axis,the angular distributions of the radiation dose rates of the three tubes were similar,and the highest leaking dose was at the angle of 160°with respect to the axis.The lower the energy of the accelerator,the higher the radiation relative leakage.For the 2.5 MeV accelerator,the maximum dose rate reached 5% of the main dose and the one on the head of the electron gun was 1%,both of which did not meet the eligible protection requirement for accelerators.We adopted different shielding designs for different accelerators.The simulated result showed that the shielded radiation leaking dose rates fulfilled the requirement. | 李泉凤 郭冰琪 张洁熹 陈怀璧 | 2008 | Chinese Physics C2008，32，7： | 0 |
| 3 | 离散型模糊变量的条件熵及其性质显示文摘基于可信性理论,定义离散型模糊变量的条件熵,并研究它的一些性质。 | 马丽 | 2009 | 科学技术与工程2009，9，2： | 0 |
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