Between Votes and Allies: South Korea's Strategic Dilemma in a World of Uncertainties

Streaming audio requires RealPlayer.The University Archives has determined that this item is of continuing value to OSU's history.Professor Taehyun Kim teaches at the Graduate School of International Studies, Chung-Ang University, Seoul, S. Korea. He has written scores of articles, either in English or Korean, on such subjects as international relations theory, foreign policy analysis, inter-Korean relations, international relations in East Asia, and other international security issues.Ohio State University. Mershon Center for International Security StudiesEvent webpage, streaming audi

mdTLS: How to Make middlebox-aware TLS more efficient?

The more data transmission over TLS protocol becomes increasingly common in IT Systems, the more middleboxes are deployed in networks. These middleboxes have several advantages, however, they become the target of cyber-attacks. Many researchers proposed revised versions of TLS protocols to make them secure, however, their approaches had some limitations. In this paper, we propose a middlebox-delegated TLS (mdTLS) protocol to improve performance based on the middlebox-aware TLS (maTLS), one of the most secure TLS protocols. We found out that the computational complexity of mdTLS is about twice as low as that of maTLS. Furthermore, we formally verified that our proposal meets newly defined security goals as well as those verified by maTLS. All of the formal models and lemmas are open to the public through following url https://github.com/HackProof/mdTLS.Comment: 22 pages, 3 figures, 9 table

National Identity and Foreign Policy Attitudes of the South Korean Public

Streaming video requires RealPlayer to view.The University Archives has determined that this item is of continuing value to OSU's history.Taehyun Kim is a Visiting Scholar at the Mershon Center for International Security Studies. His lecture links national identity to foreign policy attitudes of the South Korean public.Ohio State University. Mershon Center for International Security StudiesEvent webpage, streaming video, photo

Scalable Video Streaming over the Internet

The objectives of this thesis are to investigate the challenges on video streaming, to explore and compare different video streaming mechanisms, and to develop video streaming algorithms that maximize visual quality. To achieve these objectives, we first investigate scalable video multicasting schemes by comparing layered video multicasting with replicated stream video multicasting. Even though it has been generally accepted that layered video multicasting is superior to replicated stream multicasting, this assumption is not based on a systematic and quantitative comparison. We argue that there are indeed scenarios where replicated stream multicasting is the preferred approach. We also consider the problem of providing perceptually good quality of layered VBR video. This problem is challenging, because the dynamic behavior of the Internet's available bandwidth makes it difficult to provide good quality. Also a video encoded to provide a consistent quality exhibits significant data rate variability. We are, therefore, faced with the problem of accommodating the mismatch between the available bandwidth variability and the data rate variability of the encoded video. We propose an optimal quality adaptation algorithm that minimizes quality variation while at the same time increasing the utilization of the available bandwidth. Finally, we investigate the transmission control protocol (TCP) for a transport layer protocol in streaming packetized media data. Our approach is to model a video streaming system and derive relationships under which the system employing the TCP protocol achieves desired performance. Both simulation results and the Internet experimental results validate this model and demonstrate the buffering delay requirements achieve desired video quality with high accuracy. Based on the relationships, we also develop realtime estimation algorithms of playout buffer requirements.Ph.D.Committee Chair: Mostafa H. Ammar; Committee Co-Chair: Yucel Altunbasak; Committee Member: Chuanyi Ji; Committee Member: George Riley; Committee Member: Henry Owen; Committee Member: Jack Brassi