다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Driven by the visions of Internet of Things and 5G communications, recent years have seen a paradigm shift in mobile computing, from the centralized mobile cloud computing toward mobile edge computing (MEC). The main feature of MEC is to push mobile computing, network control and storage to the network edges (e.g., base stations and access points) so as to enable computation-intensive and latency-critical applications at the resource-limited mobile devices. MEC promises dramatic reduction in latency and mobile energy consumption, tackling the key challenges for materializing 5G vision. The promised gains of MEC have motivated extensive efforts in both academia and industry on developing the technology. A main thrust of MEC research is to seamlessly merge the two disciplines of wireless communications and mobile computing, resulting in a wide-range of new designs ranging from techniques for computation offloading to network architectures. This paper provides a comprehensive survey of the state-of-the-art MEC research with a focus on joint radio-and-computational resource management. We also discuss a set of issues, challenges, and future research directions for MEC research, including MEC system deployment, cache-enabled MEC, mobility management for MEC, green MEC, as well as privacy-aware MEC. Advancements in these directions will facilitate the transformation of MEC from theory to practice. Finally, we introduce recent standardization efforts on MEC as well as some typical MEC application scenarios.

A Survey on Mobile Edge Computing: The Communication Perspective

Driven by the visions of Internet of Things and 5G communications, recent years have seen a paradigm shift in mobile computing, from the centralized Mobile Cloud Computing towards Mobile Edge Computing (MEC). The main feature of MEC is to push mobile computing, network control and storage to the network edges (e.g., base stations and access points) so as to enable computation-intensive and latency-critical applications at the resource-limited mobile devices. MEC promises dramatic reduction in latency and mobile energy consumption, tackling the key challenges for materializing 5G vision. The promised gains of MEC have motivated extensive efforts in both academia and industry on developing the technology. A main thrust of MEC research is to seamlessly merge the two disciplines of wireless communications and mobile computing, resulting in a wide-range of new designs ranging from techniques for computation offloading to network architectures. This paper provides a comprehensive survey of the state-of-the-art MEC research with a focus on joint radio-and-computational resource management. We also present a research outlook consisting of a set of promising directions for MEC research, including MEC system deployment, cache-enabled MEC, mobility management for MEC, green MEC, as well as privacy-aware MEC. Advancements in these directions will facilitate the transformation of MEC from theory to practice. Finally, we introduce recent standardization efforts on MEC as well as some typical MEC application scenarios.

In this paper, we define and explore proofs of retrievability (PORs). A POR scheme enables an archive or back-up service (prover) to produce a concise proof that a user (verifier) can retrieve a target file F, that is, that the archive retains and reliably transmits file data sufficient for the user to recover F in its entirety.A POR may be viewed as a kind of cryptographic proof of knowledge (POK), but one specially designed to handle a large file (or bitstring) F. We explore POR protocols here in which the communication costs, number of memory accesses for the prover, and storage requirements of the user (verifier) are small parameters essentially independent of the length of F. In addition to proposing new, practical POR constructions, we explore implementation considerations and optimizations that bear on previously explored, related schemes.In a POR, unlike a POK, neither the prover nor the verifier need actually have knowledge of F. PORs give rise to a new and unusual security definition whose formulation is another contribution of our work.We view PORs as an important tool for semi-trusted online archives. Existing cryptographic techniques help users ensure the privacy and integrity of files they retrieve. It is also natural, however, for users to want to verify that archives do not delete or modify files prior to retrieval. The goal of a POR is to accomplish these checks without users having to download the files themselves. A POR can also provide quality-of-service guarantees, i.e., show that a file is retrievable within a certain time bound.

PORs: Proofs of Retrievability for Large Files

コンピュータ・サイエンス : ACM computing surveys

This document describes a mechanism called Public 4over6, which is
designed to provide IPv4 Internet connectivity over an IPv6 access
network using global IPv4 addresses. Public 4over6 was developed in
the IETF and is in use in some existing deployments but is not
recommended for new deployments. Future deployments of similar
scenarios should use Lightweight 4over6. Public 4over6 follows the Hub
and Spoke softwire model and uses an IPv4-in-IPv6 tunnel to forward
IPv4 packets over an IPv6 access network. The bidirectionality of the
IPv4 communication is achieved by explicitly allocating global non-
shared IPv4 addresses to end users and by maintaining IPv4-IPv6
address binding on the border relay. Public 4over6 aims to provide
uninterrupted IPv4 services to users, like Internet Content Providers
(ICPs), etc., while an operator makes the access network transition to
an IPv6-only access network.

Public IPv4-over-IPv6 Access Network

The invention relates to a method for multicasting using a single static bidirectional tree in a a flexible channel, belonging to a method for exterior-IP (E-IP) traversing interior-IP (I-IP) in flexible channel for multicasting grouped retransmission. The method is characterized in that a static bidirectional sharing tree is constructed in a retransmission network with all provider edge (PE) routers as leaf nodes according to bidirectional PIM (BIDIR-PIM) protocol, and its rendezvous point (RP) is a provider router (P-router) configured according to strategy; all designated forwarders (DFs) on each link circuit of RP are listed; when performing multicasting grouped retransmission, the PE router encapsulates the DF, and all the I-IP destination addresses after encapsulation are addresses of RP; the PE router retransmits the grouping after encapsulation to the RP, and each DF of the RP retransmits the multicasting grouping to all other PR routers; the PE router receiving the grouping judges whether the destination address of this grouping in its connected client network, if yes, receives, decapsulates and retransmits, and if no, directly discards the grouping. By the method, the I-IP network does not require to maintain (S, G) state and the memory space of the router is saved.

Method for multicast employing single static bidirectional sharing tree in flexible wire type tunnel

Is cloud storage ready? Performance comparison of representative IP-based storage systems

The artificial method and system of opening the shortest path prior protocol for network large scale route belongs to the technology field of network large scale route, whick has the feature as that it is a method to use the distributed real time operation system as a developing platform, to combine the route protocol artificialness and network topology analog together for route protocol testing.It first analogizes out a topology similar to actual network according to the router to be tested and then to search a suitable node to represent the router being tested within the said topology according to the real application requirement of the said router to be tested, but the artificial system will analigize all the other nodes to exchange the route information with the abovesaid router to be tested in order to let the router being tested be tested by route protocol under the circumstances of the analogized large scale network.

Simulation method and system for priority protocal of Internet large-scale route to open shortest path

Using crowdsourced visual and inertial sensor data for indoor mapping has attracted much attention in recent years. Nevertheless, the opportunities and challenges of indoor tracking using crowdsourced maps have not been fully explored. In this work, we aim at tackling the challenges due to incomplete obstacle information in crowdsourced indoor maps, especially at the initialization stage of crowdsourcing. We propose a novel solution for particle-filtering-based indoor tracking, using the crowdsourced maps derived from image-based 3D point clouds. Our solution enhances particle filtering with density-based collision detection and history-based particle regeneration. Evaluation with real user traces demonstrates that our solution outperforms the state-of-the-art. In particular, it reduces the average distance error of indoor tracking by 47% when using crowdsourced 3D point clouds.

Yong Cui

Papers

Public IPv4-over-IPv6 Access Network

Method for multicast employing single static bidirectional sharing tree in flexible wire type tunnel

Is cloud storage ready? Performance comparison of representative IP-based storage systems

Simulation method and system for priority protocal of Internet large-scale route to open shortest path

Indoor tracking using crowdsourced maps