Cheol-Hoon Lee

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Recently, there has been a rapid and wide spread of non-traditional computing platforms, especially mobile and portable computing devices. As applications become sophisticated and computation power increases, the most serious limitation on these devices is the available battery life. Dynamic voltage scaling (DVS) has been a key technique to exploit the(More)
This paper considers the problem of assigning the tasks of a distributed application to the processors of a distributed system such that the sum of execution and communication costs is minimized. Previous work has shown this problem to be tractable for a system of two processors or a linear array of N processors, and for distributed programs of serial(More)
The processors supporting the dynamic voltage scaling, called by DVS, have a feature that practically operates with discrete frequency and voltage levels. Almost of DVS algorithms select the smallest frequency level greater than the computed ideal level. Thus the system wastes a computational resource due to under-utilization. In this paper, we present an(More)
This paper describes the vertical handover architecture with low latency handover for mobile terminals which supports interworking between heterogeneous networks. The vertical handover architecture defines handover-related modules for mobile terminal and the handover switching flows among them. We adapt low latency handover method to mobile IP for reducing(More)
As part of a service oriented e-Science and Grid infrastructure, a quorum-consensus method is a valuable tool for managing replicated data and finding meaningful patterns of immense data sets. In general, a workflow is defined as set of atomic tasks that may have dependencies between each other. Tasks also may define a so-called “quorum” which denotes a(More)
We report on a de novo centric fission of chromosome 11 in a healthy female referred for chromosome analysis due to recurrent miscarriages. Both fission products were mitotically stable. This centric fission of chromosome 11 appears to have no clinical significance for this patient other than recurrent miscarriages.