译者按:这是一份法文档案资料,标题为译者所加。原件为十六开打印件,是当时法国驻成都代总领事德瓦赫(Doire)致法国外交部长比松(Pichon)的公文信函,档案编号为:Nouvelle Serie【新编之部,又称Etat Numerique des Fonds de la Carrespon...译者按:这是一份法文档案资料,标题为译者所加。原件为十六开打印件,是当时法国驻成都代总领事德瓦赫(Doire)致法国外交部长比松(Pichon)的公文信函,档案编号为:Nouvelle Serie【新编之部,又称Etat Numerique des Fonds de la Carrespondance Politique et Commerciale(1897a1918),各国政治、经济情况通讯汇编(1897—1918)】;Sous—seric:Chine(中国部分);Vol.578(第578函);PP.17—展开更多
The detection performance is evaluated for our proposed analog multiuser receiver in Ultra-WideBand (UWB) transmitted-reference system. In the presence of dense multipath and multi-access signals,the performance analy...The detection performance is evaluated for our proposed analog multiuser receiver in Ultra-WideBand (UWB) transmitted-reference system. In the presence of dense multipath and multi-access signals,the performance analysis is difficult due to the complicated waveform of received impulse. We develop an approach to analyze the steady-state Signal-to-Interference-plus-Noise (SINR) of the detector output. The multipath-spread impulse is fitted to an exponentially decaying profile in the analysis. A closed-form expression of steady-state SINR is further deduced for the proposed Least Minimum Square (LMS) detector. The analysis is validated by simulations in Line-Of-Sight (LOS) and Non-Line-Of-Sight (NLOS) channel respectively. Based on the theoretical results,the multipath delay spread is employed to determine the optimal width of the integration window of the detector.展开更多
Unconditionally secure signature is an important part of quantum cryptography. Usually, a signature scheme only provides an environment for a single signer. Nevertheless, in real applications, many signers may collabo...Unconditionally secure signature is an important part of quantum cryptography. Usually, a signature scheme only provides an environment for a single signer. Nevertheless, in real applications, many signers may collaboratively send a message to the verifier and convince the verifier that the message is actually transmitted by them. In this paper, we give a scalable arbitrated signature protocol of classical proved to be secure even with a compromised arbitrator. messages with multi-signers. Its security is analyzed and proved to be secure even with a compromised arbitrator.展开更多
The aim of this study was to find out what types of services Finnish distribution companies were purchasing and what is the future trend related to them. Results were gathered from Finnish distribution companies using...The aim of this study was to find out what types of services Finnish distribution companies were purchasing and what is the future trend related to them. Results were gathered from Finnish distribution companies using questionnaire. Theoretical background was collected from literacy to get more information of benefits and risks. Results indicate that purchasing services especially from independent service providers is increasing. Also the benefits are greater than the risks related to service purchasing.展开更多
High speed and large capacity belt conveyor is the main development trend. In the design, calculated and used of belt conveyor must be considered the high speed, large capacity, dynamic load. This paper starts from th...High speed and large capacity belt conveyor is the main development trend. In the design, calculated and used of belt conveyor must be considered the high speed, large capacity, dynamic load. This paper starts from the analysis of conveyor belt transverse vibration. Through calculate transverse vibration natural frequency of conveyor belt, and analyze the lateral stability of belt conveyor.展开更多
文摘译者按:这是一份法文档案资料,标题为译者所加。原件为十六开打印件,是当时法国驻成都代总领事德瓦赫(Doire)致法国外交部长比松(Pichon)的公文信函,档案编号为:Nouvelle Serie【新编之部,又称Etat Numerique des Fonds de la Carrespondance Politique et Commerciale(1897a1918),各国政治、经济情况通讯汇编(1897—1918)】;Sous—seric:Chine(中国部分);Vol.578(第578函);PP.17—
基金Supported by the Guangxi Natural Science Foundation (No.0731025, No.0731026)the Established Project by Guangxi Education Department (No.200808LX117)
文摘The detection performance is evaluated for our proposed analog multiuser receiver in Ultra-WideBand (UWB) transmitted-reference system. In the presence of dense multipath and multi-access signals,the performance analysis is difficult due to the complicated waveform of received impulse. We develop an approach to analyze the steady-state Signal-to-Interference-plus-Noise (SINR) of the detector output. The multipath-spread impulse is fitted to an exponentially decaying profile in the analysis. A closed-form expression of steady-state SINR is further deduced for the proposed Least Minimum Square (LMS) detector. The analysis is validated by simulations in Line-Of-Sight (LOS) and Non-Line-Of-Sight (NLOS) channel respectively. Based on the theoretical results,the multipath delay spread is employed to determine the optimal width of the integration window of the detector.
基金Supported by the National High-Tech Research,Development Plan of China under Grant Nos.2006AA01Z440,2009AA012441,2009AA012437National Basic Research Program of China (973 Program 2007CB311100)+4 种基金the National Natural Science Foundation of China under Grant Nos.60873191 and 60821001Specialized Research Fund for the Doctoral Program of Higher Education under Grant Nos.20091103120014,20090005110010Beijing Natural Science Foundation under Grant Nos.1093015,1102004the Scientific Research Common Program of Beijing Municipal Commission of Education under Grant No.KM200810005004the ISN Open Foundation
文摘Unconditionally secure signature is an important part of quantum cryptography. Usually, a signature scheme only provides an environment for a single signer. Nevertheless, in real applications, many signers may collaboratively send a message to the verifier and convince the verifier that the message is actually transmitted by them. In this paper, we give a scalable arbitrated signature protocol of classical proved to be secure even with a compromised arbitrator. messages with multi-signers. Its security is analyzed and proved to be secure even with a compromised arbitrator.
文摘The aim of this study was to find out what types of services Finnish distribution companies were purchasing and what is the future trend related to them. Results were gathered from Finnish distribution companies using questionnaire. Theoretical background was collected from literacy to get more information of benefits and risks. Results indicate that purchasing services especially from independent service providers is increasing. Also the benefits are greater than the risks related to service purchasing.
文摘High speed and large capacity belt conveyor is the main development trend. In the design, calculated and used of belt conveyor must be considered the high speed, large capacity, dynamic load. This paper starts from the analysis of conveyor belt transverse vibration. Through calculate transverse vibration natural frequency of conveyor belt, and analyze the lateral stability of belt conveyor.
