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一种三维模型的单笔画编辑方法

一种三维模型的单笔画编辑方法

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第六届智能CAD与数字娱乐学术会议

作者： Zhang Feiqian 章菲倩 Sun Zhengxing 孙正兴 Zhang Yaoye 张尧烨 Song Mofei 宋沫飞 State Key Laboratory for Novel Software Technology Nanjing University 210093 China 南京大学计算机软件新技术国家重点实验室南京210093 Department of Computer Science and Technology Nanjing University 210093 China 南京大学计算机科学与技术系南京210093

手绘草图界面是三维模型编辑最自然的方式。本文提出了一种基于单笔画的三维模型编辑方法，该方法的主要特点在于两个方面：一是依据三维模型轮廓的数学特征，采用对象空间三维模型轮廓提取方法，能更有效地提取适于手绘草图编辑的三维... 详细信息

手绘草图界面是三维模型编辑最自然的方式。本文提出了一种基于单笔画的三维模型编辑方法，该方法的主要特点在于两个方面：一是依据三维模型轮廓的数学特征，采用对象空间三维模型轮廓提取方法，能更有效地提取适于手绘草图编辑的三维模型轮廓;二是根据端点邻近性来确定三维模型轮廓中的待编辑部分，这更符合用户的编辑输入习惯。实验结果表明：本文所提出的方法能够有效地支持用户以单笔画方式编辑和修改三维模型的内外轮廓。

关键词：计算机图形学三维模型编辑轮廓提取笔画匹配模型变形

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基于手绘草图的三维树木建模

基于手绘草图的三维树木建模

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第六届智能CAD与数字娱乐学术会议

作者： Wang Bin 王斌 Sun Zhengxing 孙正兴 Zhang Yaoye 张尧烨 Zhang Yan 张岩 State Key Laboratory for Novel Software Technology Nanjing University 210093 China 南京大学计算机软件新技术国家重点实验室南京市210093 Department of Computer Science and Technology Nanjing University 210093 China 南京大学计算机科学与技术系南京市210093

本文提出了一种基于手绘草图的三维树木建模方法，使得用户可手绘输入多种简易草图生成所需树木模型。首先，由用户输入树木草图来表示所需树木模型的结构及整体形状。然后，利用基于规则的方法在草图基础上生成新的二维树枝，形成完整... 详细信息

本文提出了一种基于手绘草图的三维树木建模方法，使得用户可手绘输入多种简易草图生成所需树木模型。首先，由用户输入树木草图来表示所需树木模型的结构及整体形状。然后，利用基于规则的方法在草图基础上生成新的二维树枝，形成完整的二维树木。接着在保证三维树正视图投影与二维树结构一致的前提下，最大化三维树枝间的距离，将二维树枝转化为三维树枝，生成三维树木结构。最后，确定树枝粗细并添加树叶等细节形成完整的三维树木模型。

关键词：计算机图形学树木模型建模方法生长规则三维结构

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基于手绘草图的交互式发型建模方法

基于手绘草图的交互式发型建模方法

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第六届智能CAD与数字娱乐学术会议

作者： Wang Bin 王斌 Sun Zhengxing 孙正兴 ZhangYaoye 张尧烨 Zhang Yan 张岩 State Key Laboratory for Novel Software Technology Nanjing University 210093 China 南京大学计算机软件新技术国家重点实验室南京市210093 Department of Computer Science and Technology Nanjing University 210093 China 南京大学计算机科学与技术系南京市210093

Hairstyle is an important feature of virtual human character in computer ***, which is an important part of hair modeling, is aimed to model the shape of static hair. It'sdifficulty to ensure both hair realism and real-time performance due to the huge number of hair strandsand the complexity of hairstyles. Besides, human-computer interaction should also be considered. Thus,hairstyling still remains a challenging task. Generally, to support hairstyling effectively, it's crucial forhairstyling tools to find a tradeoff between realism and interaction.

关键词：计算机图形学虚拟人物发型设计人机交互

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A MDE Based Approach for Bridging Formal Models

A MDE Based Approach for Bridging Formal Models

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第二届IFIP/IEEE软件工程理论基础国际研讨会(TASE 2008)(Second IFIP/IEEE International Symposium on Theoretical Aspects of software Engineering)

作者： Tian Zhang Frederic Jouault Jean Bezivin Jianhua Zhao State Key Laboratory for Novel Software Technology Department of Computer Science & Technology Nanji ATLAS team INRIA & LINA Nantes University 44300 Nantes France State Key Laboratory for Novel Software Technology Department of Computer Science & Technology Nanji

Different formal methods have presented plenty of formal models for system specification and proof. Hence the problem of bridging these formal models rises. MDE is a new paradigm in software engineering, which implements software by (meta-)modeling and model transforming. In this paper, we provide a MDE based approach for bridging heterogeneous formal models: Firstly, the heterogeneous formal models are introduced into MDE as domain specific languages by metamodeling. Then, transformation rules are built for semantics mapping. At last, model-text syntax rules are developed, so as to map models to programs. Our approach could be applied on formal models in both graphical style and grammatical style. A case study of bridging MARTE to LOTOS is also illustrated showing the validity and practicability of our approach.

关键词： Model driven engineering Metamodeling software engineering computer science DSL Context modeling Bridges Laboratories Domain specific languages Specification languages

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Mitigating energy holes based on transmission range adjustment in wireless sensor networks 5

Mitigating energy holes based on transmission range adjustme...

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5th International ICST Conference on Heterogeneous Networking for Quality, Reliability, Security and Robustness, QShine 2008

作者： Song, Chao Cao, Jiannong Liu, Ming Zheng, Yuan Gong, Haigang Chen, Guihai School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu610054 China Department of Computing Internet and Mobile Computing Laboratory Hong Kong Polytechnic University Hong Kong Hong Kong State Key Laboratory for Novel Software Technology Nanjing University Nanjing210093 China

ISBN: (纸本)9789639799264

In a wireless sensor network (WSN), the energy hole problem is a key factor which affects the lifetime of the networks. In a WSN with circular multi-hop deployment (modeled as concentric coronas), sensors in one corona have the same transmission range termed as the transmission range of this corona, and different coronas have different transmission ranges, which compose a list termed as transmission range list. Based on our improved corona model with levels, we propose that a right transmission range of each corona is the decision factor for optimizing network lifetime after nodes deployment. We prove that searching optimal transmission range lists is a multi-objective optimization problem (MOP), which is NP hard. We propose a centralized algorithm and a distributed algorithm to build the transmission range list for different node distributions. The two algorithms can not only reduce the searching complexity but also obtain results approximated to the optimal solution. Furthermore, the simulation results indicate that the network lifetime under our solution approximates to that ensured by the optimal list. Compared with existing algorithms, our solution can make the network lifetime be extended more than two times longer. © Copyright 2008 ICST.

关键词： Sensor nodes

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A probabilistic approach to consistency checking for pervasive context

A probabilistic approach to consistency checking for pervasi...

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5th International Conference on Embedded and Ubiquitous Computing, EUC 2008

作者： Huang, Yu Ma, Xiang Tao, Xianping Cao, Jiannong Lu, Jian State Key Laboratory for Novel Software Technology Nanjing University Nanjing China Department of Computer Science and Technology Nanjing University Nanjing China Internet and Mobile Computing Lab. Department of Computing Hong Kong Polytechnic University Hong Kong Hong Kong

ISBN: (纸本)9780769534923

Context-awareness is a key issue in pervasive computing. Context-aware applications are prone to the context consistency problem, where applications are confronted with conflicting contexts and cannot decide how to adapt themselves. In pervasive computing environments, users are often willing to accept certain degree of context inconsistency, as long as it can reduce the consistency maintenance cost, e.g., query delay and battery power. However, existing consistency maintenance schemes do not enable the users to make such tradeoffs. To this end, we propose the Probabilistic Consistency Checking for Pervasive Context (PCCPC) algorithm. Detailed performance analysis shows that PCCPC enables the users to check consistency over arbitrarily specified ratio of context. We also conduct experiments to study the cost reduced by probabilistic checking. The analytical and the experimental results show that PCCPC enables the users to efficiently make tradeoffs between context consistency and the associated checking cost. © 2008 IEEE.

关键词： Ubiquitous computing

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Biomapping: Privacy trustworthy biometrics using noninvertible and discriminable constructions

Biomapping: Privacy trustworthy biometrics using noninvertib...

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作者： Shi, Jinyang You, Zhiyang Gu, Ming Lam, Kwok-Yan Key Laboratory for Information System Security Ministry of Education Tsinghua University China Department of Computer Science and Technology Tsinghua University China School of Software Tsinghua University China

ISBN: (纸本)9781424421756

Biometric authentication and privacy protection are conflicting issues in a practical system. Since biometrics cannot be revoked or canceled if compromised duo to the permanent association with the user, privacy-preserving biometric recognition is desired. However, the recently proposed template protection schemes are not yet sufficiently mature. Specially, the popular noninvertible transform approach will result in an obvious decrease of GAR for a fixed FAR [1]. In this paper, we put forward a novel anonymous fingerprint recognition scheme, Biomapping, as the first approach to integrate the feature extraction, noninvertible transform, and anonymous query as a whole. Biomapping extracts the fingerprint feature utilizing a minutiae-centered region encoding, then performs anonymous enrollment and verification using the noninvertible and discriminable constructions. Experiments on the public domain database show Biomapping can provide better recognition accuracy along with the ability to protect the biometric template, thus becomes a promising solution for privacy trustworthy biometric applications. © 2008 IEEE.

关键词： Biometrics

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Cluster filtered KNN: A WLAN-based indoor positioning scheme

Cluster filtered KNN: A WLAN-based indoor positioning scheme

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IEEE International Symposium on World of Wireless Mobile and Multimedia Networks (WoWMoM)

作者： Jun Ma Xuansong Li Xianping Tao Jian Lu State Key Laboratory for Novel Software Technology Department of Computer Science and Technology Nanjing University Nanjing China

Location Based Service (LBS) is one kind of ubiquitous applications whose functions are based on the locations of clients. The core of LBS is an effective positioning system. As wireless LAN (WLAN) costs less and is easy to access, using WLAN for indoor positioning has been widely studied recently. K nearest neighbors (KNN) is one of the basic deterministic fingerprint based algorithms and widely used for WLAN-based indoor positioning. However, KNN takes all the nearest K neighbors for calculating the estimated result, which could be improved if some selective work could be done to those neighbors beforehand. In this paper we propose a new scheme called "cluster filtered KNN" (CFK). CFK utilizes clustering technique to partition those neighbors into different clusters and chooses one cluster as the delegate. In the end, the final estimate can be calculated only based on the elements of the delegate. With experiments, we found that CFK does outperform KNN.

关键词： Distance measurement Wireless LAN Fingerprint recognition Nearest neighbor searches Databases Wireless communication Buildings

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How and How Much Should We Disclose?

How and How Much Should We Disclose?

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International Conference on Pervasive Computing and Applications (ICPCA)

作者： Kai Dong Wentian Lu Zhen Qin Yu Huang Xianping Tao Jian Lu State Key Laboratory for Novel Software Technology Department of Computer Science and Technology Nanjing University Nanjing China

Privacy risks result in great barriers to the long-term success of pervasive computing. Unfortunately, related researches can still be considered in its infancy. Access control is widely used for privacy protection. However, traditional access control methods can only negating or approving accesses, greatly lacking flexibility. In this paper, we introduce the disclosing degree for end-users to precisely and flexibly specify their privacy requirements. We implement a disclosing degree based scheme in the middleware Shadow for privacy protection. We also demonstrate the effectiveness of our scheme by comprehensive case-studies.

关键词： Wireless sensor networks Memory Distributed control Energy consumption Query processing Space technology Energy storage Costs computerized monitoring Databases

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Proportion-Integral Power Control for Wireless Ad Hoc Networks

Proportion-Integral Power Control for Wireless Ad Hoc Networ...

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IEEE Conference on Wireless Communications and Networking

作者： Xue Zhang Zhuo Li Sanglu Lu Daoxu Chen Xining Li State Key Laboratory for Novel Software Technology Department of Computer Science and Technology Nanjing University Nanjing China

Power control plays an important role in wireless communications. However, most existing power control protocols are not efficient enough to be applied in real ad hoc network systems. In this paper, we propose PIPC (Proportion-Integral Power Control), a novel closed-loop power control algorithm that can be used in conjunction with any routing protocol as long as the routing table of a node provides enough knowledge of local network topology. PIPC adaptively adjusts the transmission power for each node through an improved version of the classical PID (Proportion-Integral-Differential) control. The topology derived under PIPC is also fed back to the routing table that is used as its input. Both theoretical analysis and simulation study show that PIPC has a good performance.

关键词： Power control Mobile ad hoc networks Network topology Wireless communication Ad hoc networks Routing protocols Three-term control Proportional control Performance analysis Analytical models

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