Jae-hoon Kim

Content Centric Network-based Virtual Private Community

While the majority of Internet traffic is becoming of high quality multimedia variety, also mostly generated by consumers themselves, efficient content sharing with intuitive useability and security measure in a mobile environment remains an elusive goal. In this paper, we present a Content-Centric Networking (CCN) based Virtual Private Community (VPC) service which aims at supporting intuitive content sharing experience in a secure and distributed manner. VPC is a hierarchical and closed user group which consumers themselves can easily create and manage on their own devices. In VPC architecture, consumer content is shared by VPC-based content forwarding policy which is also based on hierarchical content naming. We prototyped the VPC architecture on the consumer devices to demonstrate the potential of user-oriented and distributed consumer network platform.

Inter-Chunk Popularity-Based Edge-First Caching in Content-Centric Networking

Content-centric networking (CCN) is considered promising for the efficient support of ever-increasing streaming multimedia services. Inter-chunk popularity-based caching is one of the key requirements in CCN multimedia services because some chunks of a content file tend to be requested more frequently than others. For multimedia contents, forepart chunks often have higher popularity than others as users may interrupt and abort before finishing its service. This paper presents a novel cache replication scheme, which places more popular chunks ahead on the edge router, and establishes a cache pipelining on the relaying routers along the path to reduce user-perceived delay. Simulation results show that the proposed scheme incurs less delay and reduces the overall redundant network traffic while guaranteeing a higher cache hit ratio.

Cache capacity-aware CCN: Selective caching and cache-aware routing

Content-centric networking (CCN) is a new networking paradigm to resolve the data traffic explosion problem of the Internet caused by rapid increase in file sharing and video streaming traffic. Networks with CCN avoid delivery of the same contents on one link as many times as they are requested, as contents can be stored and transferred by the cache of CCN routers. Two major features that are currently considered in CCN are in-network caching and content-aware routing. Even though both aspects are important, there is little work on the comprehensive interaction between them. In this paper, we propose the cache capacity-aware CCN which consists of selective caching and cache-aware routing methods that interacts with each other to encompass cache management and cache-aware request forwarding. The main motivation of the proposed scheme is to utilize the network caches evenly and redirect a content request based on the past forwarding of the desired contents (or chunks). To enable this function, we utilize a cache capacity metric which is collected on forwarded content requests and reflected in the content replication with popularity information from content server. We evaluate the proposed scheme against existing cache replication algorithms and show that it leads to better utilization of network caches with significant performance improvements.

Cache capacity-aware content centric networking under flash crowds

Content-centric networking (CCN) is a new networking paradigm to resolve the explosion of data traffic on the Internet caused by the rapid increase in file sharing and video streaming traffic. Networks with CCN avoid repeatedly delivering the same content of a link every time it is requested, as the content can be stored and transferred by CCN router caches. Two major features that are currently considered in CCN are in-network caching and content-aware routing. Even though both aspects are important, there is little comprehensive work on the interaction between them. In this paper, we propose a cache capacity-aware CCN that consists of selective caching and cache-aware routing methods that interact with each other to encompass cache management and cache-aware request forwarding. The main motivation of the proposed scheme is to utilize the network caches evenly and redirect a content request based on the previous forwarding of the desired contents (or chunks). To enable this function, we utilize a cache capacity metric based on recent cache memory consumption and reflect it to content replication according to the popularity information on the content server. We evaluate the proposed scheme with respect to existing cache replication algorithms and show that it leads to significant performance improvements and a better utilization of network caches.

Time-based interest protocol for real-time content streaming in content-centric networking (CCN)

Internet increasingly suffers congestion on the server side, particularly due to ever-increasing demand for high-quality audio/video streaming. CCN is considered as an important networking paradigm which can efficiently address such traffic explosion issue. Although early implementation of CCN protocol is available through CCNx open source project, current version lacks efficient support for real-time streaming applications. In this paper, we propose an enhanced mechanism for the support of real-time content streaming service in CCN, and present experimental results demonstrating its effectiveness.

A 70nm NOR flash technology with 0.049 /spl mu/m/sup 2/ cell size

A 70nm NOR flash technology has been for the first time developed with a cell size of 0.0494m, which is the smallest size of NOR flash cell, for high density memory of mobile application. The operation of 0.049PM cell transistor is successfully achieved with three key technologies such as an optimized Self-Aligned Poly (SAP) structure with top corner rounding trench structure, a cell drain contact process by ArF photo lithographic tool, and a cell transistor with a gate length of 120nm.

Named content sharing in Virtual Private Community

While the majority of Internet traffic is becoming high quality multimedia, efficient and secure content sharing with intuitive usability remains an elusive goal. In this demonstration, we present Virtual Private Community (VPC) service platform running on consumer devices such as smart phones, PCs and smart TVs in a distributed manner. It enables end-user consumers to create a hierarchical and closed user group community where they can easily and securely manage content sharing experience on their own devices. Our prototype implementation is based on CCN (Content-Centric Networking) technology to take advantage of its inherent networking efficiency and built-in security features.

An efficient name-based loss recovery for wireless content centric networking

This paper focuses on improving the reliability of packet transmission in wireless CCN. Various studies on wireless CCN have been conducted; however, only a small number have addressed such an issue of reliability. Due to the packet size limitation of the MAC layer, a segment from the upper layer needs be fragmented into smaller pieces. The problem is that a receiver cannot rebuild the segment even when only a single fragment is lost. Of course, the traditional CCN provides a solution with interest retransmission. However, this scheme causes a significant network overhead as it requires all the fragments, even the one(s) successfully transmitted, to be requested for retransmission. To solve this problem, we propose a novel scheme in which only missing fragments are requested. We compare the proposed scheme to the interest retransmission mechanism by means of implementation in order to analyze its effectiveness.

CCN naming scheme for scalable routing and incremental deployment

In this paper, we propose a Content-Centric Networking (CCN) naming scheme which combines 16 bytes of Internet Protocol (IP) address with uniquely identified CCN name. The IP address is used to find destination of a packet, and CCN name is used to identify the content when the packet is forwarded. This approach enables for CCN protocol to use same Forwarding Information Base (FIB) of current internet, as a result it allows incremental deployment of CCN on current networking infrastructures.

A New Failure Mechanism of MLC NOR Flash Memory Caused by Aggravated Drain Disturb Due to Co-Salicidation Process

We report a new failure mode of multi-level cell (MLC) NOR flash memory induced by anomalously increased drain disturb. The aggravated disturb, occurring in ppm level, is shown to be caused by an abnormal lateral encroachment of cobalt silicide on the drain side of the NOR flash cell. The failure mode, which becomes more critical as the NOR flash cell scales down, can be alleviated by optimizing the thickness of cobalt salicidation and controlling the defect density induced by spacer etch and ion implantation on the drain side