检索结果-内蒙古大学图书馆

14th International Photonics and Optoelectronics Meetings, POEM 2022

作者： Wang, Yujiang Zhou, Xingping Shi, Yuechun Chen, Xiangfei Microwave-photonics Technology Laboratory Nanjing National Laboratory of Microstructures College of Engineering and Applied Sciences Nanjing University Nanjing210093 China Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Nanjing210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing210003 China Yongjiang Lab Ningbo China

ISBN: (纸本)9781510664050

We propose a design of a bandpass-filter-integrated metalens for the gas sensing. A device with both filtering and focusing functions is designed, by integrating a one-dimensional photonic crystal and a metalens. It has a great filtering effect for one absorption peak (1650 nm) of the target gas (the methane). The transmission rate of the target wavelength is 89% and the relative intensity of the light field is up to 135. Our device has the function of focusing the light onto the photodetector (PD). The response of PD has been greatly improved. Meanwhile, the device can be fabricated into a photonic integrated chip. We provide a new scheme of the photonic integration chip for the multiple gas sensing. © 2023 SPIE.

关键词： Bandpass filters

来源：评论

学校读者我要写书评

暂无评论

Practical decoy-state reference-frame-independent measurement-device-independent quantum key distribution

引用

Physical Review A 2017年第3期95卷 032309-032309页

作者： Chun-Mei Zhang Jian-Rong Zhu Qin Wang Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China and Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China

Reference-frame-independent measurement-device-independent quantum key distribution (RFI-MDI-QKD) is proposed to remove all possible detector side channel attacks without the alignment of reference frames. Due to unavoidable multiphoton events in practical sources, the decoy-state method is always adopted in real-life QKD systems. Unlike original MDI-QKD (O-MDI-QKD), the characterization on practical decoy-state RFI-MDI-QKD is still absent to date. In this paper, we investigate the performance of practical decoy-state RFI-MDI-QKD at different misalignments of reference frames with full parameter optimization when considering statistical fluctuations, and provide a clear comparison between decoy-state RFI-MDI-QKD and O-MDI-QKD. Simulation results demonstrate that decoy-state RFI-MDI-QKD can exhibit performance comparable to that of O-MDI-QKD in practical scenarios, which is very robust in QKD systems.

关键词： Quantum communication Quantum cryptography

来源：评论

学校读者我要写书评

暂无评论

Homomorphic Signature for Identity Authentication in Cloud Computing

Homomorphic Signature for Identity Authentication in Cloud C...

引用

中国密码学会2012年会

作者： Zhiwei Wang Wei Zhang Danwei Chen College of Computer Nanjing University of Posts and TelecommunicationsNanjingJiangsu 210003China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks NanjingJiangsu 210003 Key Lab of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Post

In this paper,we introduce a new kind of homomorphic signature,which is suitable for identity authentication in cloud computing.A user firstly computes the full signature on its all identity attributes,and sends the full signature to the intermediate channel server (the intermediate channel server should check and verify it).During the valid period of his full signature,if the user wants to require a cloud service on a special identity (only involves part of identity attributes),he only needs to securely send a {0,1}n vector to the intermediate channel *** intermediate channel server who doesn't know the secret key can compute the partial signature on the special identity,and then sends it to the cloud *** give a formal secure definition of this homomorphic signature,and construct a scheme from GHR *** prove that our scheme is secure under GHR signature.

关键词： homomorphic signature identity authentication cloud computing GHR signature strong RSA assumption

来源：评论

学校读者我要写书评

暂无评论

Inclination gradient-based fall detection algorithm for wrist-worn device

Inclination gradient-based fall detection algorithm for wris...

引用

IEEE International Conference on Consumer Electronics-Taiwan (ICCE-TW)

作者： ShengQian Zhou Jianxin Chen Xinzhi Wang Liang Zhou Baoyu Zhen Jingwu Cui Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts & Telecommunications Nanjing University of Posts and Telecommunications Nanjing CN

ISBN: (纸本)9781479987467

Fall detection is one of the feasible solutions for solving the problem of aging of population. This paper presents an algorithm to detect falling for the elderly with one wrist-worn device. The algorithm has lower computation complexity to determine the fall event according to the inclination gradient. Experimental results show that it performs better than another similar devices with the average sensitivity and specificity of 94.44% and 100%, respectively.

关键词： Accelerometers Senior citizens Sensitivity Performance evaluation Classification algorithms Complexity theory Legged locomotion

来源：评论

学校读者我要写书评

暂无评论

TA3C: Teaching-Oriented Adaptive Wi-Fi Authorized Access Control Based on CSI

TA3C: Teaching-Oriented Adaptive Wi-Fi Authorized Access Con...

引用

International Conference on Mobile Ad-hoc and sensor networks, MSN

作者： Fu Xiao Jing Chen Xiaohui Xie Lijuan Sun Ruchuan Wang Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Jiangsu China College of Computer Nanjing University of Posts and Telecommunications Jiangsu China

ISBN: (纸本)9781509056972

Wi-Fi has been widely deployed with the rapid development of wireless communication technique. Wi-Fi hotspots are popular in campus, making convenient wireless network access possible. However, during class teaching, in order to avoid students browsing the web based on Wi-Fi hotspots and distracting, we hope Wi-Fi hotspots adaptively shield network access to students in the classroom, while grant access to users outside the classroom. In this work, we prototype TA3C system, a teaching-oriented adaptive Wi-Fi authorized access control scheme, using Channel State Information (CSI) to locate instead of coarse-grained and temporally unstable Received Signal Strength Indication (RSSI). CSI can distinguish multipath signals, stay stable in the same propagation environment, and show different characteristics in different propagation environments, based on which, we can distinguish outdoor and indoor environments, and identify user's location to decide whether to offer him wireless network access or not. Experiment results show that TA3C effectively achieve adaptive Wi-Fi authorized access control, which provides a guarantee for the quality of class teaching. Compared to traditional indoor localization techniques, TA3C does not need accurate location information but simply recognizes user's location indoors or outdoors, which means it does not need dedicated hardware, realizing the low-cost indoor localization technique.

关键词： wireless communication wireless fidelity wireless sensor networks Antennas Fingerprint recognition Correlation coefficient Correlation

来源：评论

学校读者我要写书评

暂无评论

A Context-aware Data Processing Model in power communication networks

A Context-aware Data Processing Model in power communication...

引用

IEEE International Conference on communications in China Workshops (ICCC)

作者： Yunfei Guo Kun Wang Shidong Liu Jinghong Guo Heng Lu Smart Grid Research Institute State Grid Nanjing china Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing china

ISBN: (纸本)9781467397025

The power communication networks is a relatively complex system with high security, which is performed in a number of ways, such as safety of power generation equipment, security of transmission and distribution lines, as well as data transmission security. The core of power communication networks security is context-aware data processing. With continuously extending in scale of the power communication networks, power communication data process become more complicated. In order to realize automatization of data processing of the power communication networks, this paper proposed a Context-aware Data Processing Model in power communication networks (CDPM). In this three-layer architecture, a Distributed Database Based on Data Categorization (DDB-DC) is designed in storage layer, which is able to choose the most efficient approach to store the context-aware data from the gathering layer according to different context-aware data types. Then, a Real-time Feature Extraction algorithm (RFE) for context-aware systems is presented in the computing layer to process the context-aware data stream. The model is a new data processing method in power communication networks.

关键词： communication networks Data processing Distributed databases Algorithm design and analysis Data models Feature extraction Correlation

来源：评论

学校读者我要写书评

暂无评论

A Lightweight Encoding Mechanism for Encrypted User Notification on Mobile Device in Power Grid System

A Lightweight Encoding Mechanism for Encrypted User Notifica...

引用

2015 International Conference on Computer Information Systems and Industrial Applications(CISIA2015)

作者： T.Zhang Z.X.Sun Y.C.Jin State Grid Smart Grid Research Institute Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry Education Nanjing University of Post and Telecommunications

ISBN: (纸本)9781510805750

As a large amount of users are now using the short message service(SMS) for communication,the demand for security is growing much stronger than ever *** notification encrypted with traditional encrypt mechanism can be transported via SMS only if the encrypted message is encoded into text *** are still many defects on existing data encoding mechanism in terms of *** paper provides a lightweight encoding mechanism for encrypted short message based on UCS-2 Chinese character set which has a lower data extension rate than commonly used encoding *** for functionality and efficiency proves the new mechanism improves the performance for user notification transmission via SMS on mobile device in power grid system.

关键词： user notification short message service(SMS) text encryption data encoding UCS-2 Chinese character set

来源：评论

学校读者我要写书评

暂无评论

A New BDI Forecasting Model based on Support Vector Machine

A New BDI Forecasting Model based on Support Vector Machine

引用

2016 IEEE Information technology,networking,Electronic and Automation Control Conference(ITNEC 2016)

作者： Jianmin Bao Lin Pan Yuanfa Xie Key Lab of Broadband Wireless Communication and Sensor Network Technology (Jiangsu Provincial Engineering Research Center of Telecommunications and Network Technology) Ministry of Education Baer Institute of Excellence Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781467391955

BDI(Dry Baltic Index) is a barometer of the shipping market, which is very important and difficult to predict precisely. The traditional forecasting method is not enough to predict precisely for it with higher complexity. The support vector machine has strong nonlinear function approximation and strong generalization ability. In this paper, a new BDI forecasting model based on support vector machine combined with CFS(Correlation-based Feature Selection) is presented and we first introduce the macroeconomic fundamental indicators of BDI. Firstly, we studied and researched the main macroeconomic fundamental indicators of BDI, investigate the inherent law and external influence of freight index fluctuation, and then put forward the BDI forecasting model based on support vector machine and demonstrate the construction principle of the forecasting model. Finally, in order to evaluate the predictive power of support vector machines, we compare their performance with the neural network model. The results show that the SVM model has a better performance in both the trend and the forecast precision, which can provide a powerful tool for the shipping market operators and investors to grasp the market trend and avoid the price risk.

关键词： BDI support vector machine feature selection CFS modeling

来源：评论

学校读者我要写书评

暂无评论

An efficient coverage control algorithm for three-dimensional underwater sensor networks

引用

Advances in Information Sciences and Service Sciences 2012年第10期4卷 393-399页

作者： Xiao, Fu Yang, Yang Sun, Li Wang, Ruchuan Nanjing University of Posts and Telecommunications Nanjing 210003 China Provincial Key Laboratory for Computer Information Processing Technology Soochow University Suzhou 215006 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China

Strategy of sensor nodes deployment is directly related to the cost and performance for underwater wireless sensor networks, which is largely determined the various service-quality improvement of wireless sensor networks. In order to improve the coverage of the target area, this paper presents a distributed algorithm of coverage control. Assume that nodes initially deployed on the surface of the water and can only move in vertical direction in 3-D space, the algorithm is first to control the nodes in-depth and relocate the nodes at different depths, then the nodes continue to adjust their depths until there is no augment for improving their coverage, and to achieve efficient coverage of the three-dimensional sensor networks ultimately. Experimental results show that compared with traditional random deployment method, the proposed coverage control algorithm can improve coverage of network effectively.

关键词： Quality control

来源：评论

学校读者我要写书评

暂无评论

QoE-driven scheme for multimedia content dissemination in Device-to-Device communication

QoE-driven scheme for multimedia content dissemination in De...

引用

International wireless communications and Mobile Computing Conference, IWCMC

作者： Aiqing Zhang Liang Zhou Lei Wang Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications China National Mobile Communications Research Laboratory Southeast University

Device-to-Device (D2D) communication has been proposed to be a promising data offloading solution in the coming big data age, with multimedia dominating the digital contents. As quality of experience (QoE) is the major determining factor in the success of new multimedia applications, we novelly propose a QoE-driven cooperative content dissemination (QeCS) scheme in the paper. Specifically, all the users predict the QoE of the potential connections characterized by mean opinion score (MOS) and send the results to the content provider (CP). Then CP formulates a weighted oriented graph based on the network topology and MOS of each potential connection. By factorizing the graph, the content dissemination fashion is established through seeking 1-factor with the maximum weight thus achieving maximum total user MOS.

关键词： Peer-to-peer computing Receivers Transmitters Yttrium Multimedia communication Mobile communication Graph theory

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：