The synchronization algorithm for constructing CAVE system on the PC cluster

[[abstract]]This paper presents a synchronization algorithm that enables a CAVEsystem to be easily constructed in a PC-cluster environment. The CAVEsystem is a surrounding display virtual reality system that canprovide high resolution of image for a group of users. Traditionally,the CAVE system uses high performance multi-channel rendering enginesto generate the images of the display wall. This paper presents adifferent approach to design the CAVE system. This paper first fullystudies the principle of distribute tasks of a simulation loop among acluster of PCs. The synchronization mechanism to coordinate thedisplay image on different PCs is then presented. Finally, theinfrastructure to construct such a CAVE system is discussed at theend.[[sponsorship]]淡江大學 驚聲中正堂驚聲國際會議廳 Tamkang University, Taiwan; Knowledge Systems Institute, USA; National Science Council, Taiwan[[notice]]補正完畢[[conferencetype]]國際[[conferencetkucampus]]淡水校園[[conferencedate]]20010926~20010928[[booktype]]紙本[[iscallforpapers]]Y[[conferencelocation]]臺北縣, 臺

Opinion spreading with mobility on scale-free networks

A continuum opinion dynamic model is presented based on two rules. The first one considers the mobilities of the individuals, the second one supposes that the individuals update their opinions independently. The results of the model indicate that the bounded confidence ∈c, separating consensus and incoherent states, of a scale-free network is much smaller than the one of a lattice. If the system can reach the consensus state, the sum of all individuals' opinion change Oc(t) quickly decreases in an exponential form, while if it reaches the incoherent state finally Oc(t) decreases slowly and has the punctuated equilibrium characteristic

Breaking universal limitations on quantum conference key agreement without quantum memory

Quantum conference key agreement is an important cryptographic primitive for future quantum network. Realizing this primitive requires high-brightness and robust multiphoton entanglement sources, which is challenging in experiment and unpractical in application because of limited transmission distance caused by channel loss. Here we report a measurement-device-independent quantum conference key agreement protocol with enhanced transmission efficiency over lossy channel. With spatial multiplexing nature and adaptive operation, our protocol can break key rate bounds on quantum communication over quantum network without quantum memory. Compared with previous work, our protocol shows superiority in key rate and transmission distance within the state-of-the-art technology. Furthermore, we analyse the security of our protocol in the composable framework and evaluate its performance in the finite-size regime to show practicality. Based on our results, we anticipate that our protocol will play an indispensable role in constructing multipartite quantum network

All-Photonic Quantum Repeater for Multipartite Entanglement Generation

Quantum network applications like distributed quantum computing and quantum secret sharing present a promising future network equipped with quantum resources. Entanglement generation and distribution over long distances is critical and unavoidable to utilize quantum technology in a fully-connected network. The distribution of bipartite entanglement over long distances has seen some progresses, while the distribution of multipartite entanglement over long distances remains unsolved. Here we report a two-dimensional quantum repeater protocol for the generation of multipartite entanglement over long distances with all-photonic framework to fill this gap. The yield of the proposed protocol shows long transmission distance under various numbers of network users. With the improved efficiency and flexibility of extending the number of users, we anticipate that our protocol can work as a significant building block for quantum networks in the future

Breaking Rate-Distance Limitation of Measurement-Device-Independent Quantum Secret Sharing

Quantum secret sharing is an important cryptographic primitive for network applications ranging from secure money transfer to multiparty quantum computation. Currently most progresses on quantum secret sharing suffer from rate-distance bound, and thus the key rates are limited and unpractical for large-scale deployment. Furthermore, the performance of most existing protocols is analyzed in the asymptotic regime without considering participant attacks. Here we report a measurement-device-independent quantum secret sharing protocol with improved key rate and transmission distance. Based on spatial multiplexing, our protocol shows it can break rate-distance bounds over network under at least ten communication parties. Compared with other protocols, our work improves the secret key rate by more than two orders of magnitude and has a longer transmission distance. We analyze the security of our protocol in the composable framework considering participant attacks. Based on the security analysis, we also evaluate their performance in the finite-size regime. In addition, we investigate applying our protocol to digital signatures where the signature rate is improved more than $10^7$ times compared with existing protocols. Based on our results, we anticipate that our quantum secret sharing protocol will provide a solid future for multiparty applications on quantum network.Comment: arXiv admin note: text overlap with arXiv:2212.0522

Expression changes and roles of matrix metalloproteinases in a rat model of traumatic deep vein thrombosis

AbstractObjectiveTo study the expression changes of matrix metalloproteinases (MMPs) in traumatic deep vein thrombosis (TDVT) in a rat model with the aid of gene chip technology and to explore the roles of MMPs in TDVT.MethodsTotally 150 Sprague Dawley rats were randomly divided into control group (n=10) and model group (n=140). Rat models of TDVT were established by clamping the femoral vein and fixing the bilateral hind limbs. Then fixation of the hip spica with plaster bandage was conducted. According to the observation phases and/or biological situations of the femoral vein thrombosis, the model rats were further divided into 7 groups. Vascular tissues were obtained from each group through noninvasive incision into the femoral vein at corresponding time points. We adopted the Trizol one-step method for total RNA extraction, Affymetrix RAT 230 2.0 array for detection of RNA expressions and fold change (FC) analysis for changes of differential expressions of MMPs in each group. The main outcome parameters measured included expressions of MMP-2, MMP-3, MMP-7, MMP-8, MMP-9, MMP-10, MMP-11, MMP-12, MMP-13, MMP-14, MMP-16, MMP-23 and MMP-24. Gene array data of these MMPs were analyzed by the Affymetrix Microarray Analysis software (Version 5.0).ResultsFC analysis showed differential expressions of MMPs in each group during the course of TDVT. At the initial period of thrombosis, MMP-2, MMP-3, MMP-7, MMP-8, MMP-9, MMP-10, MMP-11, and MMP-24 had significantly high expression, while MMP-12, MMP-13, MMP-14, MMP-16 and MMP-23 had relatively low expression. MMPs were all highly expressed at the peak time of thrombosis. In the process of thrombus resolution, MMP-2, MMP-10, MMP-16 and MMP-24 have relatively low expression, while MMP-12, MMP-13, MMP-14, MMP-16 and MMP-23 have significantly high expression.ConclusionMMPs may affect the process of TDVT through transcription regulation of the fibrinolysis-anti-fibrinolytic system during the course of thrombosis and thrombus resolution