Ik-Jun Yoon

The effects of ozone pretreatment on the biodegradability of municipal wastewater sludge were determined. Three types of experiments were conducted: anaerobic digestion, aerobic biodegradation, and denitrification using ozone-treated sludge as a carbon source. For 5 days, ozonated sludge at 0.1 gO3/g-SS showed about 2-3 times greater biodegradation compared to the raw sludge in both aerobic and anaerobic conditions. In anaerobic experiments, biodegradation increased with ozone dosage up to 0.2 g

The differentiated services architecture has been proposed for providing different levels of services and has received wide attention. A packet in a diff-serv domain is classified into a class of service according to its contract profile and treated differently by its class. While many studies have addressed issues on the diff-serv architecture (e.g., dropper, marker, classifier and shaper), there have been few attempts to analytically understand a flow's behavior in a diff-serv network. We prop

This paper discusses techniques for achieving desired throughput guarantees in the Internet that supports a differentiated services framework. The diff-serv framework proposes the use of different drop precedences to achieve service guarantees over the Internet. However, it has been observed that the drop precedences by themselves cannot achieve the desired target rates because of the strong interaction of the transport protocol with packet drops in the network. This paper proposes and evaluates

The feasibility of ozone treatment of municipal sludge for sludge reduction and carbon source production has been investigated. Significant accumulation of solubilized organics and unsettlable micro-solids (UMS) was observed at relatively low ozone dosages while mineralization became dominant at higher dosages. Batch denitrification experiments showed that the solubilized organics and the UMS could be utilized as carbon sources for nitrogen removal. In terms of overall sludge reduction, 54% redu

Summary Content‐centric networking (CCN) has been recently proposed as an alternative to traditional IP‐based networking. In CCN, content is accessed by content name instead of a host identifier (locational identifier). This new type of access methodology rapidly and efficiently disseminates content in combination with the in‐network caching mechanism. For practical use of CCN, many network properties studied in IP‐based networking are being revisited, and new types of CCN architecture component

The differentiated services (DiffServ) framework is receiving wide attention as an architecture for implementing service guarantees in the Internet. This paper looks at the impact of marking strategies employed by aggregated sources (customers) on the provided service in a DiffServ network. The paper proposes two new marking algorithms that improve the fairness among the individual flows within an aggregation.

SUMMARY In this paper, we propose a novel technique to deal with sudden bandwidth changes in transmission control protocol (TCP). In the current Internet, sudden bandwidth changes may occur because of vertical handovers between heterogeneous access networks, routing path changes, cognitive ratio, and multi‐rate wireless local area network. The current implementation of TCP is designed and optimized for stable networks and does not adapt well upon sudden bandwidth changes. Consequently, it might

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