Kyungwon Park

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Many people started being concerned about their privacy in delivering private chats, photographs, contacts and other personal information through mobile instant messaging services. Fortunately, in the majority of mobile instant messaging services, encrypted communication channels (e.g., using the SSL/TLS protocols) are used by default to protect delivered(More)
Instant messaging (IM) is increasingly popular among not only Internet but also smartphone users. In this paper, we analyze the security issue of an IM application, KakaoTalk, which is the most widely used in South Korea, with a focus on automated friends registration based on contacts sync. We demonstrate that there are multiple ways of collecting victims’(More)
The balance between tissue-type plasminogen activator (t-PA) and plasminogen activator inhibitor type 1 (PAI-1) regulates fibrinolysis. PAI-1 expression increases in atherosclerotic arteries and vascular smooth muscle cells (VSMCs) are one of major constituents of atheroma. We investigated the impact of lysophosphatidylcholine (lysoPC), an active component(More)
Users' phone numbers are popularly used for finding friends in instant messaging (IM) services. In this paper, we present a new security concern about this search feature through a case study with KakaoTalk which is the most widely used IM in Korea. We demonstrate that there are multiple ways of collecting victims' personal information such as their(More)
Several inversion modeling-based approaches have been developed/used to extract soil hydraulic properties (α, n, θres, θsat, Ksat) from remotely sensed (RS) soil moisture footprints. Hydrological models with shallow ground water (SGW) table depths in soils simulate daily root zone soil moisture dynamics based on the extracted soil parameters. The presence(More)
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