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Daejeon, South Korea

Pai Chai University is one of South Korea's oldest modern universities. Its campus is located in Seo-gu, in Daejeon metropolitan city, on the lower slopes of Yeonja Mountain. It has a present-day student body of about 14,000. Undergraduate programs are administered by the Colleges of Humanities, Foreign Studies, Business Administration, Social science, Tourism Management, Natural science, Engineering, Performing Inter-media Arts and Fine Arts. Numerous graduate programs in these fields are provided as well. Wikipedia.

Kim H.K.,Samsung | Im K.H.,Pai Chai University | Park S.C.,Kyung Hee University
Expert Systems with Applications | Year: 2010

Recently, as hacking attempts increase dramatically; most enterprises are forced to employ some safeguards for hacking proof. For example, firewall or IPS (Intrusion Prevention System) selectively accepts the incoming packets, and IDS (Intrusion Detection System) detects the attack attempts from network. The latest version of firewall works in cooperation with IDS to immediately response to hacking attempts. However, it may make false alarms that misjudge normal traffic as hacking traffic and cause network problems to block the normal IP address by false alarms. By these false alarms made by IDS, system administrators or CSOs make wrong decisions and important data may be exposed or the availability of network or server system may be exhausted. Therefore, it is important to minimize the false alarms. As a way of minimizing false alarms and supporting adequate decisions, we suggest the RFM (Recency, Frequency, Monetary) analysis methodology, which analyzes log files with incorporating three criteria of recency, frequency and monetary with statistical process control chart, and thus leads to an intuitive detection of anomaly and misuse events. Moreover, to cope with hacking attempts proactively, we apply CBR (case based reasoning) to find out similarities between already known hacking patterns and new hacking patterns. With the RFM analysis methodology and CBR, we develop DSS which can minimize false alarms and decrease the time to respond to hacking events. In case that RFM analysis module finds out unknown viruses or worms occurred, this CBR system matches the most similar incident case from case-based database. System administrators can easily get information about how to fix and how we fixed in similar cases. And CSOs can build a blacklist of frequently detected IP addresses and users. This blacklist can be used for incident handling. Finally, we propose collaborative incident response system with DSS, this distributed agent systems interactively exchange the suspicious users and source IP addresses data and decide who is true-anomalous users and which IP addresses is the most riskiest and then deny all connections from that users and IP addresses automatically with less false-positives. © 2009 Elsevier Ltd. All rights reserved.

Lee S.-C.,Korea Christian University | Im K.H.,Pai Chai University
Journal of Computer Virology and Hacking Techniques | Year: 2015

The purpose of this paper is to study the differences of factors affecting banking behavior in multi-channel environment. This paper adopted multi-group structural equation modeling to compare the differences of causalities between internet and mobile banking. The result of causality in this paper generally supports the theory of technology acceptance model and the paths across the two groups are different. Certain relations in multi-channel are the same, for example the behavioral intention of internet banking and mobile banking usage are determined by perceived usefulness, trust and perceived ease of use sequentially. Alternatively, several differences exist in the external variables of beliefs. Internet banking regards self-efficiency and perceived ease of use more important. Mobile banking considers situational normality and trust more important. © 2015, Springer-Verlag France.

Hong J.-H.,Pai Chai University
Molecules | Year: 2013

1-Trimethylsilyl, 1-R (R = Me, Et, i-Bu)-2,3,4,5-tetraphenyl-1- silacyclopentadiene [Ph4C4Si(SiMe3)R] are synthesized from the reaction of 1-trimethylsilyl,1-lithio-2,3,4,5-tetraphenyl- 1-silacyclopentadienide anion [Ph4C4SiMe3] -•[Li]+ (3) with methyl iodide, ethyl iodide, and i-butyl bromide. The versatile intermediate 3 is prepared by hemisilylation of the silole dianion [Ph4C4Si]-2•2[Li] + (2) with trimethylsilyl chloride and characterized by 1H-,13C-, and 29Si-NMR spectroscopy. 1,1-bis(R)-2,3,4,5-tetraphenyl-1-silacyclopentadiene [Ph4C 4SiR2] {R = n-Bu (7); t-Bu (8)} are synthesized from the reaction of 2 with n-butyl bromide and t-butyl bromide. Reduction of 7 and 8 with lithium under sonication gives the respective 3-silolenide 2,5-carbodianions {[Ph4C4Si(n-Bu)2] -2•2[Li]+ (10) and [Ph4C 4Si(t-Bu)2]-2•2[Li]+ (11)}, which are characterized by 1H-, 13C-, and 29Si-NMR spectroscopy. Polarization of phenyl groups in 3 is compared with those of silole anion/dianion, germole anion/dianion, and 3-silolenide 2,5-carbodianions 10 and 11. © 2013 by the authors.

Lee G.-H.,Dong - Eui University | Song J.-H.,Pai Chai University
Applied Surface Science | Year: 2010

Brush-shaped ZnO particles were synthesized by controlling the growth time in the direct melt oxidation process of Al-Zn mixture in air at atmospheric pressure. Particles with two kinds of structures were formed. One was consisted of nanowires grown along [0 0 0 1] direction at the six corners and the center of (0 0 0 1) basal plane on hexagonal ZnO microrod. The other was constructed by nanobelts between the corner-nanowires as well as nanowires at the corners on ZnO microrod. The structural configuration that the nanowires and the nanobelts have a well coherent orientation alignment with the base microrod implies that the brush-shaped ZnO is single crystal. Room temperature PL spectrum of the brush-shaped ZnO particles displayed predominant green emission with a wavelength of 510 nm. © 2009 Elsevier B.V. All rights reserved.

The previously unknown silole dianion [SiC 4Et 4] 2-•2[Li] + (3) was prepared by the sonication of 1,1-dichloro-2,3,4,5-tetraethyl-1-silacyclopentadiene [Cl 2SiC 4Et 4, 2] with more than four equivalent of lithium in THF. 1H-, 13C-, and 29Si-NMR data of 3 are compared with those of the reported silole dianion [SiC 4Ph 4] 2-. Trapping of 3 with trimethylchlorosilane gave 1,1-bis(trimethylsilyl)-2,3,4,5-tetraethyl-1-silacyclopentadiene [(Me 3Si) 2SiC 4Et 4, 4] in high yield. The silole of 2 was synthesized in high yield in three steps by a modified procedure using Cp 2ZrCl 2 via Cp 2ZrC 4Et 4 and 1,4-dibromo-1,2,3,4-tetraethyl-1,3-butadiene. © 2011 by The Authors.

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