Eun-suk Cho

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In this paper we address one research challenges in vehicular ad hoc networks (VANETs), Safety message dissemination as follows. We investigate the quality of service for beacon based safety applications in VANETs. We point out the fact that safety applications have some distinctiveness which is not addressed in the current literature. We therefore propose(More)
Secure broadcasting is an essential feature for critical operations in wireless sensor network (WSNs). However, due to the limited resources of sensor networks, verifying the authenticity for broadcasted messages is a very difficult issue. μTESLA is a broadcast authentication protocol, which uses network-wide loose time synchronization with one-way hashed(More)
Critical Infrastructures are so vital that a damage or breakage of it will greatly affect the society and economy. SCADA systems play a big role on Critical Infrastructure since most of these infrastructures are controlled systems. Presented in this paper are the vulnerabilities of a SCADA system, its effect to the society and the ways to prevent such(More)
OBJECTIVE To validate the diffusion-weighted MRI (DWI) for differentiation of benign from malignant portal vein thrombosis. MATERIALS AND METHODS The Institutional Review Board approved this retrospective study and waived informed consent. A total of 59 consecutive patients (52 men and 7 women, aged 40-85 years) with grossly defined portal vein thrombus(More)
PURPOSE To investigate the clinical significance of gallbladder (GB) wall thickening frequently observed in patients with acute hepatitis A. METHODS A total of 328 consecutive patients who were diagnosed with acute hepatitis A and underwent abdominal ultrasonography were enrolled retrospectively. Patients were divided into two groups: GB wall thickening(More)
Imaging studies including magnetic resonance imaging (MRI) play a crucial role in the diagnosis and staging of hepatocellular carcinoma (HCC). Several recent studies reveal a large number of MRI features related to the prognosis of HCC. In this review, we discuss various MRI features of HCC and their implications for the diagnosis and prognosis as imaging(More)
OBJECTIVE To investigate the validity of the 100 kVp setting in CT venography (CTV) in the diagnosis of deep vein thrombosis (DVT), and to evaluate the feasibility of reducing the amount of administered iodine in this setting. MATERIALS AND METHODS After receiving the contrast medium (CM) of 2.0 mL/kg, 88 patients underwent CTV of the pelvis and lower(More)
Critical Infrastructure (CI) is used by governments as a term to describe infrastructures, systems and assets that are essential for the society and economy. Critical Infrastructures are so vital that an incapacity or destruction of such infrastructure, system or assets would have a debilitating impact on security, national economic security, national(More)
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