Kyungbaek Kim

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Many cooperated web cache systems and protocols have been proposed. These systems, however, require expensive resources, such as external bandwidth and proxy cpu or storage, while inducing hefty administrative costs to achieve adequate client population growth. Moreover, a scalability problem in the cache server management still exists. This paper suggests(More)
We propose SocialFilter, a trust-aware collaborative spam mitigation system. SocialFilter enables nodes with no email classification functionality to query the network on whether a host is a spammer. It employs trust inference to weigh the reports concerning spamming hosts that collaborating spam-detecting nodes (reporters) submit to the system.(More)
—This paper addresses reliability of data dissemination applications when there are severe disruptions to the underlying physical infrastructure. Such massive simultaneous physical failures can happen during the geographical events such as natural disasters (earthquakes, floods, tornados) or sudden power outages-infrastructure failures in these cases are(More)
To disseminate messages from a single source to a large number of targeted receivers, a natural approach is the tree-based application layer multicast (ALM). However, in time-constrained flash dissemination scenarios, e.g. earthquake early warning, where time is of the essence, the tree-based ALM has a single point of failure; its reliable extensions using(More)
Many p2p based wide-area storage systems are appeared to provide scalable storage services with idle resource from many unreliable clients. To minimize the data loss, quick replication is important to replace lost redundancy on other nodes in reaction to failures. The popular approach is the availability based replication which uses the individual node(More)
Emerging societal scale notification applications call for a system that is able to efficiently support simple, yet changing subscriptions for a very large number of users. In this paper we propose DYNATOPS, a dynamic topic-based pub/sub architecture that provides efficient scalable societal scale event notifications for dynamic subscriptions via(More)
SUMMARY DHT based p2p systems appear to provide scalable storage services with idle resource from many unreliable clients. If a DHT is used in storage intensive applications where data loss must be minimized, quick replication is especially important to replace lost redundancy on other nodes in reaction to failures. To achieve this easily, a simple(More)
—The eventual goal of any notification system is to deliver appropriate messages to all relevant recipients with very high reliability in a timely manner. In particular, we focus on notification in extreme situations (e.g. disasters) where geographically correlated failures hinder the ability to reach recipients inside the corresponding failed region. In(More)
—Anonymity is one of the main virtues of the Internet, as it protects privacy and enables users to express opinions more freely. However, anonymity hinders the assessment of the veracity of assertions that online users make about their identity attributes, such as age or profession. We propose FaceTrust, a system that uses online social networks to provide(More)