基于背景差分法的虚拟手术损伤区入刀点定位     

廖梦怡  王建玺 《科技通报》2015,(2):197-199

在虚拟手术系统模型中,特别是脑外科手术中,由于背景图像色彩的非规则性和非均匀性,导致对脑部损伤区域的手术入刀切割点的定位不准,影响手术精度和效果。传统方法采用损伤区域差异特征信息提取方法实现入刀点定位,对脑部特征二维灰度图片缺陷边界的定位效果不佳。提出一种基于背景差分法的虚拟手术损伤区入刀点定位算法,构建了虚拟手术的总体结构模型,将背景图像和人体软组织目标图像划分为多个子块,基于直方图选择阈值对差分图像序列进行二值化,得到高斯虚拟人体器官解析模型。设计医学图像分割算法,采用背景差分技术确定手术器械与软组织发生碰撞的激励因子,快速获取碰撞点,实现对虚拟手术入刀点的准确定位。实验结果表明,采用该算法实现虚拟手术系统设计和图像重构,对手术过程中器官损伤区域切割入刀点定位准确,性能优越,视景效果较好,计算时间缩短,精度提高。  相似文献   

低碳理念下的古镇旅游发展--以青岩古镇为例     

张福春  廖洪泉 《安顺学院学报》2015,(1):84-86

青岩古镇在旅游业发展中引入了低碳的理念,在旅游生产中坚持基础设施建设低碳化、交通运输方式低碳化、古镇建设低碳化和提高碳汇能力,在旅游消费中引导游客进行低碳饮食、低碳住宿、低碳出行和低碳旅游购物等,对降低整个景区的碳排放具有良好效果。  相似文献   

One-heater flow-through polymerase chain reaction device by heat pipes cooling     

Jyh Jian Chen  Ming Huei Liao  Kun Tze Li  Chia Ming Shen 《Biomicrofluidics》2015,9(1)

This study describes a novel microfluidic reactor capable of flow-through polymerase chain reactions (PCR). For one-heater PCR devices in previous studies, comprehensive simulations and experiments for the chip geometry and the heater arrangement were usually needed before the fabrication of the device. In order to improve the flexibility of the one-heater PCR device, two heat pipes with one fan are used to create the requisite temperature regions in our device. With the integration of one heater onto the chip, the high temperature required for the denaturation stage can be generated at the chip center. By arranging the heat pipes on the opposite sides of the chip, the low temperature needed for the annealing stage is easy to regulate. Numerical calculations and thermal measurements have shown that the temperature distribution in the five-temperature-region PCR chip would be suitable for DNA amplification. In order to ensure temperature uniformity at specific reaction regions, the Re of the sample flow is less than 1. When the microchannel width increases and then decreases gradually between the denaturation and annealing regions, the extension region located in the enlarged part of the channel can be observed numerically and experimentally. From the simulations, the residence time at the extension region with the enlarged channel is 4.25 times longer than that without an enlarged channel at a flow rate of 2 μl/min. The treated surfaces of the flow-through microchannel are characterized using the water contact angle, while the effects of the hydrophilicity of the treated polydimethylsiloxane (PDMS) microchannels on PCR efficiency are determined using gel electrophoresis. By increasing the hydrophilicity of the channel surface after immersing the PDMS substrates into Tween 20 (20%) or BSA (1 mg/ml) solutions, efficient amplifications of DNA segments were proved to occur in our chip device. To our knowledge, our group is the first to introduce heat pipes into the cooling module that has been designed for a PCR device. The unique architecture utilized in this flow-through PCR device is well applied to a low-cost PCR system.  相似文献   

论大学校园文化中的公寓文化建设     

毛兰香  廖中曦  李朋辉  屈艳香  谭卫龙 《湘南学院学报》2015,(1):101-103,124

公寓文化是校园文化的重要组成部分。目前在校园文化特别是公寓文化建设中存在着一些问题,如学校对公寓文化建设重视不够,公寓文化活动仍处于自发性和盲目性状态,缺乏有效的管理监督机制,内涵相对贫乏,网络文化的消极影响严重等。高校应加强对学生公寓的管理,在提升公寓后勤管理队伍的整体素质的同时,通过加强公寓硬件、精神文明、管理服务等方面的建设,营造一个优秀健康、和谐向上的大学生公寓文化氛围,促进大学生的全面健康发展。  相似文献   

浅谈英语写作评改过程中有效的反馈     

廖利华 《鸡西大学学报》2011,(12):78-79

英语写作离不开反馈,反馈的作用在英语写作教学中不可忽视。文章的好坏与写作过程中作者得到的反馈息息相关,可以说反馈贯穿于整个写作过程。教师要想提高学生的写作水平,就必须采取有效的方法,给学生提供多级的反馈,从而诱导学生积极修改文章。探讨了在作文批改中教师如何引入有效的反馈方式,建立交互式的写作教学环境以及建立有效的写作纠错机制,从而有效地提高学生的写作能力。  相似文献   

广州大学校园体育设施调查研究   总被引：2，自引：0，他引：2  

陈浩龙  廖洁英  李柳欣  李文翎 《时代教育》2011,(5)

本文主要对广州大学校园体育设施进行调查研究,并利用ArcGIS软件制作出广州大学校园体育设施分布图.研究得出了广州大学校园体育设施在使用、分布、维护及管理等方面存在的问题.针对问题,提出了合理布局,充分发挥学校场地器材综合功能等建议.  相似文献   

萨摩亚《公共档案法》述评     

廖嘉琦 《兰台世界》2019,(8):28-31

萨摩亚是南太平洋的岛国之一,其在档案方面的立法较晚,《萨摩亚公共档案法》是萨摩亚档案法规体系的核心,是萨摩亚的基本档案法。为探究萨摩亚国家档案法发展背景、进程及立法具体情况,给我国以及其他国家的档案法规体系发展建设提供参考与借鉴,研究采用文献研究法、网络调研法和对比分析的方法对萨摩亚《公共档案法》进行了介绍、述评、分析。最后本研究对萨摩亚的《公共档案法》作出了评价与思考,为萨摩亚国家档案工作发展提供参考借鉴。  相似文献   

土荆芥浸提液对几种种子萌发的化感作用     

刘荷芬  许桂芳  李丁涛  廖安龙 《河南科技学院学报》2011,39(1)

采用室内生物测定法,以小麦,油菜,上海青等作物为受体,研究了土荆芥的化感作用.结果表明:①土荆芥叶的浸提液对3种作物种子萌发均具有抑制作用,且这种抑制作用随着浸提液浓度的增加而增强;②浓度为0.01g/mL和0.02g/mL的茎的浸提液对上海青、油菜的幼苗生长有促进作用;③相同浓度的土荆芥叶浸提液对供试种子萌发的的抑制作用强于茎浸提液.  相似文献   

Identity: a complex structure for researching students’ academic behavior in science and mathematics     

Mehmet Aydeniz  Lynn Liao Hodge 《Cultural Studies of Science Education》2011,6(2):509-523

This article is a response to Pike and Dunne’s research. The focus of their analysis is on reflections of studying science post-16. Pike and Dunne draw attention to under enrollments in science, technology, engineering, and mathematics (STEM) fields, in particular, in the field of physics, chemistry and biology in the United Kingdom. We provide an analysis of how the authors conceptualize the problem of scientific career choices, the theoretical framework through which they study the problem, and the methodology they use to collect and analyze data. In addition, we examine the perspective they provide in light of new developments in the field of students’ attitudes towards science and mathematics. More precisely, we draw attention to and explicate the authors’ use of identity from the perspective of emerging theories that explore the relationships between the learner and culture in the context of science and mathematics.  相似文献   

英语应用能力考试听力题型内容分析和答题策略     

廖淑娜 《佳木斯教育学院学报》2015,(4):246-247

对英语应用能力考试中听力题型内容及考生在考试中存在的问题进行分析,提出了有效的答题策略。  相似文献