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一种基于逐次逼近法求解软组织力平衡的方法
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作者 朴明波 付宜利 修立刚 《机器人》 EI CSCD 北大核心 2011年第6期679-684,共6页
进行腹腔微创手术操作时,为获得软组织变形的图形反馈,需要进行软组织的力平衡求解.建立了胆囊及其附管路的几何模型,对其赋予弹簧-质点力学模型,提出了一种基于逐次逼近法的力平衡算法求解软组织力平衡.该算法编程量较少,易于实现,仿... 进行腹腔微创手术操作时,为获得软组织变形的图形反馈,需要进行软组织的力平衡求解.建立了胆囊及其附管路的几何模型,对其赋予弹簧-质点力学模型,提出了一种基于逐次逼近法的力平衡算法求解软组织力平衡.该算法编程量较少,易于实现,仿真实时性也较好.仿真实验表明,该算法可以产生较为真实的软组织图形反馈,可以实际应用于软组织仿真中. 展开更多
关键词 力平衡求解 微创手术 软组织仿真 逐次逼近 图形反馈
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按压胆囊的微创手术操作仿真
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作者 朴明波 付宜利 毛君 《辽宁工程技术大学学报(自然科学版)》 CAS 北大核心 2013年第5期688-692,共5页
针对使用机器人进行腹腔微创胆囊手术仿真时胆囊的变形问题,研究了按压胆囊时胆囊的变形过程.建立了胆囊及其附属管路的几何模型,针对该几何模型建立了基于弹簧-质点模型的力学模型.提出了使用手术器械按压胆囊时的手术仿真算法,对该仿... 针对使用机器人进行腹腔微创胆囊手术仿真时胆囊的变形问题,研究了按压胆囊时胆囊的变形过程.建立了胆囊及其附属管路的几何模型,针对该几何模型建立了基于弹簧-质点模型的力学模型.提出了使用手术器械按压胆囊时的手术仿真算法,对该仿真算法进行了验证.图形反馈表明该算法可以实现胆囊及其附属管路的按压操作仿真,其图形反馈较为真实,实时性也较好.仿真结果表明:该算法可用于医学仿真,可实际应用于胆囊及其附属管路的操作仿真. 展开更多
关键词 机器人手术 微创手术 胆囊手术 胆囊模型 虚拟现实 操作仿真 按压操作 图形反馈
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Online composite shape recognition based on relevance feedback
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作者 王强 孙正兴 《Journal of Southeast University(English Edition)》 EI CAS 2005年第2期153-158,共6页
This paper describes a novel method of online composite shape recognition interms of the relevance feedback technology to capture a user's intentions incrementally, and adynamic user modeling method to adapt to va... This paper describes a novel method of online composite shape recognition interms of the relevance feedback technology to capture a user's intentions incrementally, and adynamic user modeling method to adapt to various users' styles. First, the relevance feedback isadapted to refine the recognition results and reduce the ambiguity incrementally based on theestablishment of a feature-based vector model of a user's sketches. Secondly, a dynamic usermodeling is introduced to model the user's sketching habits based on recording and analyzinghistorical information incrementally. A model-based matching strategy is also employed in the methodto recognize sketches dynamically. Experiments prove that the proposed method is both effective andefficient. 展开更多
关键词 sketchy-based user interface online composite shape recognition dynamicuser modeling relevance feedback
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Web Information Retrieval: Problem and Prospects
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作者 Monika Arora Uma Kanjilal Dinesh Varshney 《Computer Technology and Application》 2011年第1期48-57,共10页
The information access is the rich data available for information retrieval, evolved to provide principle approaches or strategies for searching. For building the successful web retrieval search engine model, there ar... The information access is the rich data available for information retrieval, evolved to provide principle approaches or strategies for searching. For building the successful web retrieval search engine model, there are a number of prospects that arise at the different levels where techniques, such as Usenet, support vector machine are employed to have a significant impact. The present investigations explore the number of problems identified its level and related to finding information on web. The authors have attempted to examine the issues and prospects by applying different methods such as web graph analysis, the retrieval and analysis of newsgroup postings and statistical methods for inferring meaning in text. The proposed model thus assists the users in finding the existing formation of data they need. The study proposes three heuristics model to characterize the balancing between query and feedback information, so that adaptive relevance feedback. The authors have made an attempt to discuss the parameter factors that are responsible for the efficient searching. The important parameters can be taken care of for the future extension or development of search engines. 展开更多
关键词 Information retrieval web information retrieval search engine USENET support vector machine relevance feedback.
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