音乐推荐系统主观评价指标研究——以网易云音乐为例

算法推荐在大数据时代是用户获取信息的重要渠道,推荐质量关乎用户的体验态度。如今在用户基数庞大的音乐推荐系统背后,推荐质量参差不齐、用户心理感受被忽视,该领域缺乏一个通用的用户评价指标体系。因此,研究以用户心理体验为导向,在文献回顾和深度访谈的基础上,编制出适用于音乐推荐系统评价的初始量表,通过预调查和正式调查,并采用探索性因素分析、验证性因素分析等统计方法对调查结果进行检验分析,最终获取由内容性、功能性、页面设计、感知易用性、感知体验、干扰风险和质量风险七个维度构成的音乐推荐系统用户评价量表。研究进一步对网易云音乐用户的推荐系统体验态度以及相关影响因素进行探索,最后从实践角度对音乐平台推荐系统的优化方向提出建议。国家社会科学基金艺术学一般项目(16BH134

城乡链接与农民合作

2009-2010 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

An optimization method for equivalent bulk permeability of gas shale matrix with crushed samples and re-recognition of the influence of pressure and particle size

The pressure decay (or gas expansion) test with crushed samples has been used to evaluate the matrix permeability of shale and other low-permeability rock for many years. However, there still exist uncertainties relating to particle size and equilibrium pressure. The existing late-stage curve fitting method has the advantage of easy calculation, but the assumption that gas enters particles with a single permeability value is not generally applicable for shale samples, and late-stage analysis may lead to underestimation. This study proposes an optimization method to determine the equivalent bulk permeability that ensures the smallest sum of squares of errors between the forward-predicted pressure decay curve and the measure one. Both the optimization and curve fitting method are applied to two shale samples from the Ordovician Wufeng Formation of two wells in the Sichuan Basin, China with improved apparatus and testing procedures. The optimization method is superior to the curve fitting method in the repeatability and regularity on the change of apparent permeability with pressure. A strong linear relationship between apparent permeability and coefficient of compressibility is established between 3 and 12 bars. The variation of permeability with particle size is more diverse than that is commonly understood and might be nonmonotonic, depending on the change of pore structure during crushing. Change of apparent permeability with pressure (non-Darcy feature) is proposed as a criterion of whether pore structure has changed significantly. It is suggested to measure the variation of permeability with pressure and particle size to obtain a more comprehensive understanding of matrix permeability and pore structure

網路互動式3D應用-以室內傢俱擺設為例

[[abstract]]因現今電腦科技資訊的發達，使得3D虛擬實境日益普遍，突破以往大多只能使用2D的網際網路。3D虛擬實境「室內設計互動式平臺」突破傳統，不用請設計師設計，還可在家不用出門，依個人需求、喜好、構想來設計屬於自已的格局。以往要請設計師幫忙設計屬於自已的空間時，常常要與設計師一而再，再而三的討論，才可以漸漸形成自已夢想中的家。我們運用了3DS MAX建構了許多傢俱模型和Virtools Dev的3D整合、動作指令、控制語法、攝影機等方法建立了「室內設計互動式平臺」提供了坪數大小、空間、格局、傢俱種類，讓使用者在家就可以自行更換成自已想要的傢俱種類與擺設

面条品质性状相关基因在四川小麦中的分布

为给面条小麦亲本材料的选择提供依据,利用多重PCR技术分析了Wx-B1和2个主效PPO位点的等位基因在104份四川主栽小麦和骨干亲本中的分布,并检测了59份新育成品系的淀粉糊化特性。结果表明,控制低PPO活性的等位基因PPO-2Ab和PPO-2Da的频率分别为42.3%和83.6%,Wx-B1蛋白缺失基因Wx-B1b的频率为26.9%,四川小麦淀粉特性整体表现较优良。Wx-B1缺失小麦在峰值粘度、稀懈值、最终粘度和反弹值方面与正常类型间差异显著。绵阳26、川麦107、川麦43等是面条小麦育种的优良亲本。