ANSYS在化工设备结构优化设计中的应用

优化设计一直是工程界较为关注的领域,文章用 ANSYS 软件对U形管换热器的管板厚度进行了优化设计,结果表明:合理的结构优化设计可以提高安全性和经济性,并为换热器的设计提理论依据.     

Preface

The International Conference on Knowledge Science, Engineering and Management (KSEM), which was held in Belfast, Northern Ireland in 2010, was the fourth success in the series of such conferences. The conference focuses on the three themes of knowledge science, engineering and management, covering a wider range of research topics in the KSEM-related areas. This event offered an invaluable opportunity to bring together researchers, engineers and practitioners to present original work, the latest advances on knowledge representation, pioneered knowledge engineering, knowledge related systems, as well as discuss and debate practical challenges in deploying knowledge-based systems and research opportunities in the research community. To highlight research activities drawn by this event and provide an insight into the latest developments in the related areas, we present this special issue which is dedicated to all the delegates and researchers in the community who made the conference a success. We selected more than 10 papers that were presented in the conference and asked the authors to extend these papers. After careful review, we finally select 6 papers to be included in this special issue. This collection of extended versions of papers consists of the KSEM2010''s finest papers and covers the prominent topics of knowledge representation and reasoning, ontology engineering and applications, data mining and knowledge discovery. They represent state of the art of research in KSEM-related research areas.     

Synthesis of diblock copolymer poly(10-hydroxydecanoic acid)/polystyrene by combining enzymatic condensation polymerization and ATRP

Summary The diblock copolymers poly(10-hydroxydecanoic acid)-block-polystyrene (PHDA-b-PSt) were synthesized by combining enzymatic condensation polymerization of 10-hydroxydecanoic acid (HDA) and atom transfer radical polymerization (ATRP) of styrene (St). PHDA was firstly obtained via enzymatic condensation polymerization catalyzed by Novozyme-435. Subsequently one end of poly(10-hydroxydecanoic acid) (PHDA) chains was modified by reaction with α-bromopropionyl bromide and the other was protected by chlorotrimethylsilane (TMSCL), respectively, the resulting monofunctional macroinitiator was used in the ATRP of St using CuCl/2,2^′-bipyridine (bpy) as the catalyst system to afford the diblock copolymers including biodegradable PHDA blocks and well-defined PSt blocks.     

基于多级残差网络的环境声音分类方法

为了对环境声音进行更好的识别和分类,提出了基于多级残差网络（Multilevel residual network, Mul-EnvResNet）的环境声音分类方法。对声音事件进行时标和基频压扩之后,提取其梅尔频率倒谱系数（Mel-frequency cepstral coefficients, MFCCs）,以及它们的差分作为特征参数送入Mul-EnvResNet对声音事件进行分类。实验数据集采用ESC-50,将Mul-EnvResNet模型与端到端的卷积神经网络（EnvNet）、基于注意力机制的循环神经网络（Attention based convolutional recurrent neural network, ACRNN）,以及受限卷积玻尔兹曼机的无监督滤波器组模型（Convolutional restricted Boltzmann machine, ConvRBM）进行对比实验。实验结果表明, Mul-EnvResNet取得了89.32%的最佳分类准确率,相较上述3种模型在分类准确率上分别有18.32%、3.22%、2.82%的提升,相较于其他的声音分类方法也均有明显的优势。     

内蒙古中部旗县城镇化过程中的动力因素分析--以土默特左旗和达拉特旗为例

内蒙古中部包括呼和浩特市、包头市、鄂尔多斯市三市,是内蒙古经济最发达的地区,共有旗县15个。本文选取呼和浩特市所辖的土默特左旗和鄂尔多斯市(原伊克昭盟)所辖的达拉特旗为例,分析旗县城镇化动力因素的演变、现状和评价,并探讨城镇发展的对策。     

Ensemble softmax regression model for speech emotion recognition

Multimedia Tools and Applications - Automatic emotion recognition from speech signals is one of the important research areas. Most speech emotion recognition methods have been proposed, among which...     

Self-assembled sponge-like hydroxyapatite induced by modified articular cartilage membrane template

Using modified pig bone articular cartilage membrane as template, a sponge-like hydroxyapatite (HA) scaffold material was in-situ synthesized by self-assembly in simulated body fluid. Its crystallographic structure and composition were studied by SEM, XRD, FTIR and TEM, which showed that the synthesized sample was carbonated HA crystals and the three-dimensional interconnected sponge-like structure consists of massive nano hydroxyapatite plates. The physicochemical properties of the samples were tested and the results indicated that the sponge-like HA had high density, porosity and specific surface. Experimental cell culture results also showed that sponge-like HA greatly increases the bioactivity, osteoconductivity and differentiation of human osteosarcoma MG-63 cells.     

社交网用户行为关系推演模型

如何发现具有紧密关系的用户并为其提供信息推荐服务，是目前学术界和工业界关于社交网用户行为关系研究的热点问题之一。迄今为止，大部分社交网用户行为关系研究主要局限于用户间“关注（follow）”行为上，导致用户间关系的发现尚不够准确和完善。在社交网应用之一的Twitter平台中，“@（mention）”关系相比于一般“关注”关系能更准确反映用户间紧密关系程度，因此提出了一种新的用户间相似关系，即UPBR （user pair behavior relationship）关系，该关系体现了在相近地理位置进行相似活动的语义行为，如餐饮、旅行、购物等；根据该关系提出了一种UPBR推演模型，即UPBR-IM，该模型一方面通过用户上传的@Tweet文本来推演用户语义行为活动相似性，另一方面则利用最大似然估计对文本发布位置进行概率最大化计算来推演用户物理位置相似性；最后结合二者结果判断用户间是否存在UPBR关系，从而实现高质量的信息推荐服务。扩展性的实验结果验证了该模型是可行和有效的。