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정고은(Koeun Jung),김영래(Younglae Kim),민윤기(Yoonki Min) 충남대학교 사회과학연구소 2017 사회과학연구 Vol.28 No.4
Vishing (voice phishing) is a common form of social-engineering attack directed at humans. The cost of vishing attacks has gradually increased since the first case occurred in 2006. Although the number of cases has recently declined due to the precaution policy introduced by the Korean government, the amount of damage per victim has risen and new casesinvolving novel vishing methods have appeared. The present study investigated not only the current extent of damage in Korea but also the psychological vulnerability of victims. Results found the relation between major vishing tactics and psychological triggers behind social engineering.Little evidence of behavioral study, however, was conducted for investigating the relationship. Therefore, we suggest the direction of a post study that can validate the relationship between psychological triggers and vishing.
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Topological Transitions in Carbon Nanotube Networks <i>via</i> Nanoscale Confinement
Somu, Sivasubramanian,Wang, Hailong,Kim, Younglae,Jaberansari, Laila,Hahm, Myung Gwan,Li, Bo,Kim, Taehoon,Xiong, Xugang,Jung, Yung Joon,Upmanyu, Moneesh,Busnaina, Ahmed American Chemical Society 2010 ACS NANO Vol.4 No.7
<P>Efforts aimed at large-scale integration of nanoelectronic devices that exploit the superior electronic and mechanical properties of single-walled carbon nanotubes (SWCNTs) remain limited by the difficulties associated with manipulation and packaging of individual SWNTs. Alternative approaches based on ultrathin carbon nanotube networks (CNNs) have enjoyed success of late with the realization of several scalable device applications. However, precise control over the network electronic transport is challenging due to (i) an often uncontrollable interplay between network coverage and its detailed topology and (ii) the inherent electrical heterogeneity of the constituent SWNTs. In this article, we use template-assisted fluidic assembly of SWCNT networks to explore the effect of geometric confinement on the network topology. Heterogeneous SWCNT networks dip-coated onto submicrometer wide ultrathin polymer channels become increasingly aligned with decreasing channel width and thickness. Experimental-scale coarse-grained computations of interacting SWCNTs show that the effect is a reflection of a topology that is no longer dependent on the network density, which in turn emerges as a robust knob that can induce semiconductor-to-metallic transitions in the network response. Our study demonstrates the effectiveness of directed assembly on channels with varying degrees of confinement as a simple tool to tailor the conductance of the otherwise heterogeneous network, opening up the possibility of robust large-scale CNN-based devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-7/nn100714v/production/images/medium/nn-2010-00714v_0003.gif'></P>
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Co - occurrence matrix 기반 비데오 영상 검색
김규헌(Kyuheon Kim),정세윤(Se-Yoon Jung),전병태(Byeong Tae Chun),이재연(Jaeyeon Lee),배영래(Younglae Bae) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅱ
Multimedia data is now one of the widely used information in all the fields as the fast developments of computer techniques have been made. Traditional database systems based on textual information have limitations when applied to multimedia information. This is because simple textual descriptions are ambiguous and inadequate for searching multimedia information for multimedia databases and digital libraries. Thus, especially for image data, which is one of the important multimedia information types, there have been recently considerable interests in content-based image retrieval techniques, which can retrieve and browse image data on the basis of pictorial queries. Therefore, this paper presents an efficient method for describing texture information in image data.
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Total quilting suture at latissimus dorsi muscle donor site: Drain tube is no longer needed
Younjung Cha,Seokwon Lee,Youngtae Bae,Younglae Jung,Jungbum Choi 대한종양외과학회 2019 Korean Journal of Clinical Oncology Vol.15 No.2
Purpose: The purpose of this study was to assess the effect of quilting suture extent on the latissimus dorsi myocutaneous flap (LDMCF) donor site and the necessity of drainage. Methods: Clinical data of 136 breast cancer patients, who underwent breast reconstruction using LDMCF between May 2014 and December 2015, were retrospectively reviewed. Patients were divided into three groups. Group A: quilting sutures were performed on half of the LDMCF donor site and a closed suction drain was inserted. Group B: quilting sutures were performed for the entire LDMCF donor site and a closed suction drain was inserted. Group C: quilting sutures were performed for the entire LDMCF donor site and no drain was inserted. The duration of drainage, total drainage, length of hospital stay, number of postoperative aspirations for seroma removal, and total aspirated volume were compared. Results: In the comparison of groups A and B, group B showed better results including the total amount of drained seroma, drain maintenance period, number of aspirations for seroma removal after drainage tube removal, total aspirated seroma, and hospitalization period with statistical significance (P<0.05). In the comparison of groups B and C, group C without drain showed no difference in all other variables except mean total drained seroma volume. Therefore, group C was superior to group A and there was no difference compared to group B with drain, even though the drain was not inserted. Conclusion: Total quilting suture at LDMCF donor site can reduce seroma formation and eliminate the need for a drain tube.
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Polypyrrole Films with Micro/Nanosphere Shapes for Electrodes of High-Performance Supercapacitors
Lee, JuKyung,Jeong, Hobin,Lassarote Lavall, Rodrigo,Busnaina, Ahmed,Kim, Younglae,Jung, Yung Joon,Lee, HeaYeon American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.38
<P>We demonstrate a simple and efficient one-step procedure for synthesizing a solid state polypyrrole (PPy) thin film for supercapacitor applications using alternating current impedance spectroscopy. By controlling the frequency and amplitude we were able to create unique PPy nano/Microstructures with a particular morphology of the loop. Our PPy micro/nanosphere shows extremely high capacitance of 568 F/g, which is close to the theoretical value of 620 F/g and 20-100% higher than that of other, reported PPy electrodes. Most of all, this material presents high capacitance and significantly improved electrochemical stability without pulverization of its :structure, demonstrating 77% retention of the capacitance value even after 10 000 charge/discharge cycles. These results are a consequence of the larger surface area and adequate porosity generated due to the balance between the nano/micro PPy loops. This created porous structure also allows the favored penetration of electrolyte and high ion mobility within the polymer and prevents the mechanical failure of the physical-structure during volume variation associated with the insertion/deinsertion of ions upon cycling.</P>
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