面向真实电子商务的实验平台开发和实验设计

首先讨论了研制电子商务的实验平台ECEP的核心技术和其功能框架;在面向真实电子商务应用的可操作环境ECEP上,设计了三个层次的电子商务教学实验：电子商务实验体验、电子商务开发实验和平台组件自身的开发实验,最后分析了该平台及其实验的特色和创新点。     

自动焊接成套设备大行程部件位置精度的测量

论述了利用具有较高尺寸精度和几何精度 (圆度 )的装饰薄壁管 ,在对其施加适当的轴向拉力 ,使其自身挠度消失的条件下 ,用以替代昂贵的长专业量棒进行大行程焊接变位机、操作机成套设备的相互位置精度测量的全新工艺方法。这种检测方法简便易行 ,可广泛用于类似的大行程自动焊接成套设备中机械部件间相互位置的测量与调整。     

现代工业设计对技术体系的协调作用

着重分析西方学术界对技术体系的影响及作用 ,结合现代工业设计的思想、性质、特点等 ,分析论证如何将现代工业设计的思想观念、方法运用到技术体系中 ,不断调整技术体系与人的协调关系 ,从而建立与人文相适应的技术体系。     

基于Lévy分布的不平衡数据过采样方法

针对不平衡数据集上的分类问题，提出了基于Lévy分布的过采样方法，其核心思想是根据初始数据集的分布，利用Lévy分布构造新样本的密度分布。基于Lévy分布的特性，使得从边界样本合成的新样本密度最大，靠近多数类的样本合成的新样本密度次之，靠近少数类的样本合成的新样本密度最小。因此，该算法可以增强分类边界，同时可以减小噪声生成。通过在多个数据集上的实验，表明所提算法可以有效改善不平衡数据的分类效果。     

针对不平衡数据的过采样和随机森林改进算法

针对数据不平衡带来的少数类样本识别率低的问题,提出通过加权策略对过采样和随机森林进行改进的算法,从数据预处理和算法两个方面降低数据不平衡对分类器的影响。数据预处理阶段应用合成少数类过采样技术(Synthetic Minority Oversampling Technique,SMOTE)降低数据不平衡度,每个少数类样本根据其相对于剩余样本的欧氏距离分配权重,使每个样本合成不同数量的新样本。算法改进阶段利用Kappa系数评价随机森林中决策树训练后的分类效果,并赋予每棵树相应的权重,使分类能力更好的树在投票阶段有更大的投票权,提高随机森林算法对不平衡数据的整体分类性能。在KEEL数据集上的实验表明,与未改进算法相比,改进后的算法对少数类样本分类准确率和整体样本分类性能有所提升。     

Multi-criteria location identification for wind/solar based hydrogen generation: The case of capital cities of a developing country

The identification of site location is one of the critical tasks in developing or expanding any supply chain system including the construction of renewable power generation plants. The accurate identification of a plant site can considerably reduce unforeseen risks and costs and also raise productivity and efficacy. As such, this study sought to thoroughly evaluate all capital cities of a developing country for the establishment of a hybrid wind/solar power plant to produce hydrogen while considering the most influential and conflicting criteria. For this, 14 criteria including daily solar radiation, wind power density, clearness index, altitude, population, average sunny hours in a year, unemployment rate, average air temperature, average air humidity, average yearly precipitation, natural disasters, the distance between the site and the main road, average dusty days per year, and land price constituted the set of vital factors. To prioritize alternatives, a Fuzzy Multi-Criteria Decision Making approach named FVIKOR (Fuzzy Multi-Criteria Optimization and Compromise Solution) was used. The results indicated that among 31 capital cities, the city of Yazd with a wind power density of 309.5 W/m² and daily solar radiation of 5.4 kWh/m² would be the best location for the purpose of this study. To validate the findings, FTOPSIS (Fuzzy Technique for Order Preference by Similarity to Ideal Solution) method was utilized and it also ranked Yazd as the first option. Then, a sensitivity analysis was conducted to discern the behavior of each criterion and their impact on the ranking of the cities. Finally, for hydrogen generation, an autonomous hybrid wind/solar system was techno-economically assessed using HOMER software. According to the analysis outcome, the proposed system showed a payback period of 7 years with levelized cost of 4.75 $/kg for hydrogen.     

混凝土内斜柱施工技术

以厦门汇金国际中心工程为例,详细阐述了混凝土内斜柱的整个施工工艺流程,包括内斜柱钢筋绑扎、模板设计与加固、混凝土浇筑等施工技术方面的实践及探讨。     

基于DK7740P电火花线切割机床多次切割研究

在国内电加工界对电火花丝线切割的研究基础上,结合DK7740P线切割机床的应用,阐述高速走丝多次切割的基本条件,以及多次切割过程中各种工艺参数的确定。详细分析了在线切割机床上进行单次和多次切割加工时尺寸精度的对比实验,表明在高速走丝线切割机床上采用多次切割技术,可以明显提高加工精度,带来显著的经济效益。     

Assessment of the thermal environment effects on human comfort and health for the development of novel air conditioning system in tropical regions

This research shows the result of a brainstorming by medical experts in the first ranking university medical school and hospital of Thailand. It was based on Delphi technique. The objective of this research was to study both direct and indirect effects of humidity and temperature on human health in air-conditioned buildings in Thailand. Afterwards, the result was used to design and develop split type air conditioner (conventional air conditioner) which could control relative humidity and temperature with precision air conditioning system to comply with the climate and the suitability of the people living in Thailand building. The result of operation with precision inverter air conditioning system showed that the temperature inside the room changed from the default value around ±0.2 °C (Case 1) and around ±0.35 °C (Case 2) and it could control relative humidity as a desired condition between 50-60% (both cases) which was the appropriate range for Thai climate. Moreover, energy consumption of precision inverter air conditioning system was still less than conventional air conditioning system for about 7.5%. This research could provide people living in Thailand air conditioned building with human thermal comfort and health.     

营养强化食品生产中微胶囊技术的应用探讨

本文阐述了食品营养强化的作用和要求,重点分析了营养强化食品中常用的强化方法及存在的主要问题,提出了微胶囊技术在营养强化食品中的应用构想。