Dong-Yeop Hwang

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Electrical properties of three kinds of poly(methyl methacrylate) (PMMA) with different tacticity, i.e. isotactic(i), syndiotactic(s), and atatic(a), were investigated for the application in field effect transistor. Metal-insulator-silicon structures were fabricated via spin coating PMMA on heavily doped p-type silicon (p-Si) followed by evaporating gold(More)
Internet of things (IoT) has rapidly become one of the most familiar and perhaps most discussed topic on the research field. The attention for the Internet of Things is mainly due to the new connected products intended to bring greater efficiencies and simplicity to life. Variety of IoT applications lead to equally wide variety of security issues. In this(More)
The widespread use of SIP has exposed a lot of vulnerabilities in this protocol. Among them, overload can cause serious problems for SIP servers. SIP overload occurs when a SIP server does not have enough resources to process messages. In this paper, we proposed effective methods to control SIP server overload based on the Window-Based overload control(More)
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