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Lee, Sugyu,Hong, Kinam,Yeon, Yeongmo,Jung, Kyusan Hindawi Limited 2018 Advances in materials science and engineering Vol.2018 No.-
<P>This paper presents both experimental and analytical research results for predicting the flexural capacity of reinforced concrete (RC) slabs strengthened in flexure with basalt fabric-reinforced cementitious matrix (FRCM). A total of 13 specimens were fabricated to evaluate the flexural behavior of RC slabs strengthened with basalt FRCM composite and were tested under four-point loading. The fiber type, tensile reinforcement ratio, and the number of fabric layers were chosen as experimental variables. The maximum load of FRCM-strengthened specimens increased from 11.2% to 98.2% relative to the reference specimens. The energy ratio and ductility of the FRCM-strengthened specimens decreased with the higher amount of fabric and tensile reinforcement. The effective stress level of FRCM fabric can be accurately predicted by a bond strength of ACI 549 and Jung’s model.</P>
Plasmonic Organic Solar Cells Employing Nanobump Assembly <i>via</i> Aerosol-Derived Nanoparticles
Jung, Kinam,Song, Hyung-Jun,Lee, Gunhee,Ko, Youngjun,Ahn, KwangJun,Choi, Hoseop,Kim, Jun Young,Ha, Kyungyeon,Song, Jiyun,Lee, Jong-Kwon,Lee, Changhee,Choi, Mansoo American Chemical Society 2014 ACS NANO Vol.8 No.3
<P>We report the effect of a nanobump assembly (NBA) constructed with molybdenum oxide (MoO<SUB>3</SUB>) covering Ag nanoparticles (NPs) under the active layer on the efficiency of plasmonic polymer solar cells. Here, the NPs with precisely controlled concentration and size have been generated by an atmospheric evaporation/condensation method and a differential mobility classification and then deposited on an indium tin oxide electrode <I>via</I> room temperature aerosol method. NBA structure is made by enclosing NPs with MoO<SUB>3</SUB> layer <I>via</I> vacuum thermal evaporation to isolate the undulated active layer formed onto the underlying protruded NBA. Simulated scattering cross sections of the NBA structure reveal higher intensities with a strong forward scattering effect than those from the flat buffer cases. Experimental results of the device containing the NBA show 24% enhancement in short-circuit current density and 18% in power conversion efficiency compared to the device with the flat MoO<SUB>3</SUB> without the NPs. The observed improvements are attributed to the enhanced light scattering and multireflection effects arising from the NBA structure combined with the undulated active layer in the visible and near-infrared regions. Moreover, we demonstrate that the NBA adopted devices show better performance with longer exciton lifetime and higher light absorption in comparison with the devices with Ag NPs incorporated flat poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). Thus, the suggested approach provides a reliable and efficient light harvesting in a broad range of wavelength, which consequently enhances the performance of various organic solar cells.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-3/nn500276n/production/images/medium/nn-2014-00276n_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn500276n'>ACS Electronic Supporting Info</A></P>
Kinam Hong,Sugyu Lee,Yeongmo Yeon,Kyusan Jung 한국콘크리트학회 2018 International Journal of Concrete Structures and M Vol.12 No.5
This paper proposes an advanced near-surface-mounted (NSM) technique with an Fe-based shape-memory alloy (Fe-SMA) strip which can solve issues of low workability and reduced ductility of reinforced concrete (RC) beams strengthened with an NSM technique using prestressed fiber-reinforced polymer (FRP) strips in the concrete tension section. The flexural behavior of the RC beam strengthened by the NSM technique with the Fe-SMA strip was investigated. A total of seven RC beams were tested by four-point bending tests under displacement control. The type of reinforcements, the quantity of Fe-SMA strips, and the pre-straining level of the Fe-SMA strips were considered as experimental variables. Cracking load, yielding load, and ultimate load increased, respectively, with larger quantities of Fe-SMA strip. In addition, activation of embedded Fe-SMA in the concrete by electrical resistance heating effectively induces a prestressing force on the concrete beam, resulting in a cambering effect. The introduced prestressing force to the RC beam by activation of the Fe-SMA increased the crack and yielding loads, and did not decrease the ductility of the RC beam compared to the RC beam with non-activated Fe-SMA. It can be concluded from the test results that the strengthening technique using the recovery stress of the Fe-SMA strip as the prestressing force solves the various problems of the existing prestressing strengthening systems, meaning that Fe-SMA can be used as a substitute for conventional prestressing strengthening systems.
Jung, Kyusan,Hong, Kinam,Han, Sanghoon,Park, Jaekyu,Kim, Jaehyun Hindawi Limited 2015 International journal of polymer science Vol.2015 No.-
<P>This paper presents both experimental and analytical research results for predicting the flexural capacity of reinforced concrete (RC) beams strengthened in flexure with fabric reinforced cementitious matrix (FRCM). In order to assess the efficiency of the FRCM-strengthening method, six beams were strengthened in flexure with FRCM composite having different amounts and layers of FRP fabric and were tested under four-point loading. From test results, it was confirmed that the slippage between the FRP fabric and matrix occurs at a high strain level, and all of the FRCM-strengthened beams failed by the debonding of the FRCM. Additionally, a new bond strength model for FRCM considering the slippage between fabric and matrix was proposed, using a test database to predict the strengthening performance of the FRCM composite. The prediction of the proposed bond strength model agreed well with the debonding loads of the test database.</P>
Sohn, Jung Inn,Joo, Heung Jin,Ahn, Docheon,Lee, Hyun Hwi,Porter, Alexandra E,Kim, Kinam,Kang, Dae Joon,Welland, Mark E American Chemical Society 2009 NANO LETTERS Vol.9 No.10
<P>We demonstrate that the Mott metal-insulator transition (MIT) in single crystalline VO(2) nanowires is strongly mediated by surface stress as a consequence of the high surface area to volume ratio of individual nanowires. Further, we show that the stress-induced antiferromagnetic Mott insulating phase is critical in controlling the spatial extent and distribution of the insulating monoclinic and metallic rutile phases as well as the electrical characteristics of the Mott transition. This affords an understanding of the relationship between the structural phase transition and the Mott MIT.</P>
Identifying non-Elliptical Noun Phrase
YoungHee Jung,Kinam Park,JeongMin Chae 중소기업융합학회 2015 중소기업융합학회 국제학술대회논문집 Vol.2 No.1
In this paper we used linguistic rules for resolving elliptical noun phrases. Without correct detection of omitted noun phrase, the syntactic analysis of the whole sentence fails. The GENIA and CRAFT corpora were used to evaluate the performance of the proposed system. The corpora were used to evaluate the performance of the system according to the quality of the dictionary.
Shin Kinam,Cho Won Chul,Shin Nara,Kim Hong Rae,Kim Min-Seok,Chung Cheol Hyun,Jung Sung-Ho 대한심장혈관흉부외과학회 2024 Journal of Chest Surgery (J Chest Surg) Vol.57 No.2
Background: Left ventricular assist devices (LVADs) are widely employed as a therapeutic option for end-stage heart failure. We evaluated the outcomes associated with centrifugal- flow LVAD implantation, comparing 2 device models: the Heartmate 3 (HM3) and the Heartware Ventricular Assist Device (HVAD). Methods: Data were collected from patients who underwent LVAD implantation between June 1, 2015 and December 31, 2022. We analyzed overall survival, first rehospitalization, and early, late, and LVAD-related complications. Results: In total, 74 patients underwent LVAD implantation, with 42 receiving the HM3 and 32 the HVAD. A mild Interagency Registry for Mechanically Assisted Circulatory Support score was more common among HM3 than HVAD recipients (p=0.006), and patients receiving the HM3 exhibited lower rates of preoperative ventilator use (p=0.010) and extracorporeal membrane oxygenation (p=0.039). The overall early mortality rate was 5.4% (4 of 74 patients), with no significant difference between groups. Regarding early right ventricular (RV) failure, HM3 implantation was associated with a lower rate (13 of 42 [31.0%]) than HVAD implantation (18 of 32 [56.2%], p=0.051). The median rehospitalization-free period was longer for HM3 recipients (16.9 months) than HVAD recipients (5.3 months, p=0.013). Furthermore, HM3 recipients displayed a lower incidence of late hemorrhagic stroke (p=0.016). In the multivariable analysis, preoperative use of continuous renal replacement therapy (odds ratio, 22.31; p=0.002) was the only significant predictor of postoperative RV failure. Conclusion: The LVAD models (HM3 and HVAD) demonstrated comparable overall survival rates. However, the HM3 was associated with a lower risk of late hemorrhagic stroke.