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Im, Ji-Hoon,Song, Seung-Ho,Cho, Sung-Min The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.2
This paper proposes a point of common coupling (PCC) voltage compensation algorithm using a current limitation strategy for use in distributed generation (DG). The proposed strategy maintains the PCC voltage by prioritizing currents when an output current reference is larger than the current capacity of the power condition system (PCS) of the DG. With this strategy, the DG outputs the active current, reactive current, and the negative sequence current. The DG uses the reactive current for maintaining the PCC voltage within a normal range; the negative sequence current is used for reducing the PCC voltage unbalance. The proposed method was verified using PSIM simulation and experimental results.
Im, Ha-Ni,Kim, In-Ho,Singh, Bhupendra,Jeon, Sang-Yun,Yoo, Young-Sung,Song, Sun-Ju The Electrochemical Society 2017 Journal of the Electrochemical Society Vol.164 No.4
<P>In this work, we investigated charge transport properties of La0.1Sr0.9Co0.8Fe0.2O3-delta (LSCF1982) by a blocking cell experiment in isothermal conditions in 800-950 degrees C range. By measuring the ionic charge of transport (alpha(*)(i)) vs. oxygen partial pressure (pO(2)), the cross-effect between ionic and electronic flows were investigated. The values of alpha(*)(i) were found to be non-zero with a magnitude of 0.43-1.15 in 800-950 degrees C range, indicating that even in the absence of a direct cause of electron flow a significant number of electrons are dragged by the cations. By constructing an Onsager matrix, the values of Onsager transport coefficients were extracted. It was observed that the Onsager coefficients related with the cross-effect (L-ie = L-ei) have nearly of the same order of magnitude that of the Onsager coefficient for ionic flow (L-ii) and therefore cannot be ignored. The values of partial ionic conductivity were calculated from Onsager matrix and which showed an exponential increase (sigma O-2-alpha pO(2)(m), m = 1/2) with increasing pO(2) and temperature at 800 degrees C but less dependence on pO(2) at the higher temperatures. (C) 2017 The Electrochemical Society. All rights reserved.</P>
Im, Se-Ung,Hong, Ji-Youn,Chae, Gyung-Joon,Jung, Ui-Won,Kim, Chang-Sung,Lee, Yong-Keun,Cho, Kyoo-Sung,Kim, Chong-Kwan,Choi, Seong-Ho Korean Academy of Periodontology 2008 Journal of Periodontal & Implant Science Vol.38 No.2
Purpose: The aim of this study was to evaluate the factors affecting healing patterns of surgically created circumferential gap defects around implants in dogs. Materials and Methods: In four mongrel dogs, all mandibular premolars were extracted. After 8 weeks of healing periods, implants were submerged. According to the surface treatment, turned surface was designated as a group A and rough surface as a group B. In each dog, surgical defects on the left side were made with a customized tapered step drill and on the right with a customized paralleled drill. Groups were also divided according to the width of the coronal gaps: 1.0mm, 1.5mm, or 2.0mm. The dogs were sacrificed following 8 weeks and the specimens were analyzed histologically and histomorphometrically. Results: During the postoperative period, healing was uneventful and implants were well-maintained. As the size of the coronal gap was increased, the amount of bone-to-implant contact was decreased. The bone healing was greater in rough surface implants compared to the turned ones. About the defect morphology, tapered shape showed much bone healing and direct bone to implant contact even in the smooth surface implants. Conclusion: Healing of the circumferential defect around dental implant is influenced by the implant surface, defect width and the morphology of the defect. When using rough surface implants, circumferential gap defects within 2 mm do not need any kinds of regenerative procedures and the healing appeared to be faster in the tapered defect morphology than the paralleled one.
Im, Gwang-Bum,Kim, Yeong Hwan,Kim, Yu-Jin,Kim, Sung-Won,Jung, Euiyoung,Jeong, Gun-Jae,Wang, Ke,Kim, Jinheung,Kim, Dong-Ik,Kim, Tae-Hyung,Yi, Gi-Ra,Yu, Taekyung,Bhang, Suk Ho MDPI AG 2019 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.20 No.19
<P>Injecting human mesenchymal stem cells (hMSCs) at wound sites is known to have a therapeutic effect; however, hMSCs have several limitations, such as low viability and poor engraftment after injection, as well as a potential risk of oncogenesis. The use of a conditioned medium (CM) was suggested as an alternative method for treating various wounds instead of direct hMSC administration. In addition to not having the adverse effects associated with hMSCs, a CM can be easily mass produced and can be stored for long-term, thereby making it useful for clinical applications. In general, a CM is collected from hMSCs with low passage number; whereas, the hMSCs with high passage number are usually discarded because of their low therapeutic efficacy as a result of reduced angiogenic factor secretion. Herein, we used a CM collected from high passage number (passage 12, P12) hMSCs treated with gold-iron nanoparticles (AuFe NPs). Our AuFe NPs were designed to release the iron ion intracellularly via endocytosis. Endosomes with low pH can dissolve iron from AuFe NPs, and thus, the intracellularly released iron ions up-regulate the hypoxia-inducible factor 1α and vascular endothelial growth factor (VEGF) expression. Through this mechanism, AuFe NPs improve the amount of VEGF expression from P12 hMSCs so that it is comparable to the amount of VEGF expression from low passage number (passage 6, P6), without treatment. Furthermore, we injected the CM retrieved from P12 MSCs treated with AuFe NPs in the mouse skin wound model (AuFe P12 group). AuFe P12 group revealed significantly enhanced angiogenesis in the mouse skin wound model compared to the high passage hMSC CM-injected group. Moreover, the result from the AuFe P12 group was similar to that of the low passage hMSC CM-injected group. Both the AuFe P12 group and low passage hMSC CM-injected group presented significantly enhanced re-epithelization, angiogenesis, and tissue remodeling compared to the high passage hMSC CM-injected group. This study reveals a new strategy for tissue regeneration based on CM injection without considering the high cell passage count.</P>
Anomalous thermal transition and crystallization of ionic liquids confined in graphene multilayers
Im, Jinkyu,Cho, Sung Dae,Kim, Min Hye,Jung, Young Mee,Kim, Hoon Sik,Park, Ho Seok The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.14
<P>Anomalous thermal transition and crystallization behaviors of three room temperature ionic liquids (RTILs) in graphene multilayers (GMLs), in a different manner to bulk RTILs, occurred due to the molecular orientation of the confined system triggered by the complex π–π stacking and hydrogen bonding interactions.</P> <P>Graphic Abstract</P><P>Anomalous thermal transition and crystallization behaviors of three room temperature ionic liquids (RTILs) in graphene multilayers (GMLs), in a different manner to bulk RTILs, occurred due to the molecular orientation of the confined system triggered by the complex π–π stacking and hydrogen bonding interactions. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc16367e'> </P>
Review : Application Fields and Strategy of KOMPSAT-2 Imagery
Ho Sang Sakong,Jung Ho Im 大韓遠隔探査學會 2002 大韓遠隔探査學會誌 Vol.18 No.1
KOMPSAT-2 satellite is being developed to be launched in 2004 expectingly. This paper is investigating application status of satellite imagery data using various domestic and foreign references such as journals and dissertations and seeing status of policy making and project implementation. In order to promote the application of KOMPSAT-2 imagery, its application ways in each field are presented. In addition, this paper suggests strategies to induce application of KOMPSAT-2 imagery.
Im, Byung-Jin,Lee, Sang Cheon,Lee, Myung-Hyun,Leesungbok, Richard,Ahn, Su-Jin,Kang, Yoon-Goo,Lee, Do Yun,Yoon, Joon-Ho,Lee, Suk Won Institute of Physics Publishing Ltd 2016 Biomedical Materials Vol.11 No.3
<P>We demonstrate that a composite surface of microgroove titanium (Ti) with immobilized fibronectin (FN) or bone sialoprotein II (BSP2) promotes osteoblastic differentiation and osteogenic transcription factor expression in human bone marrow-derived mesenchymal stem cells (MSCs). Comparisons made between smooth microgrooves, microgrooves with silanization and microgrooves with matrix protein (FN or BSP2)-immobilization Ti surfaces revealed a significant promotion of in vitro osteogenic activity and osteoblastic differentiation at various timelines of culture. An even more significant increase was verified on microgrooves with a matrix protein-immobilization Ti surface in 28 d time-dependent gene expression of the main osteogenic transcription factors, such as ARF4, FRA1, RUNX2, and OSX. As a result, a synergestic effect regarding the promotion of osteogenic transcription factor expression and osteoblastic differentiation in the matrix protein-microgroove Ti composite surface was confirmed. From a multiple regression analysis using various timelines of osteogenic culture as independent variables, day 13 was verified as the most prominent influential timeline for the promotion of osteoblastic differentiation induced by the matrix protein-microgroove Ti composite surface. The FN-or BSP2-microgroove Ti composite surface resulting from silanization can strongly induce the promotion of osteoblastic differentiation in human MSCs. The proposed surface is expected to be useful in the development of a variety of osteogenic biomaterial surfaces.</P>
Clinical Significance of Age at the Time of Diagnosis among Young Breast Cancer Patients
Im-kyung Kim,Se Ho Park,Hye Won Hwang,Jun Sang Lee,Si Mon Ko,김승일,박병우 한국유방암학회 2011 Journal of breast cancer Vol.14 No.4
Purpose: The aims of this study were to investigate outcomes corresponding to age at diagnosis as categorized into 5-year intervals and to explore whether endocrine-responsive tumors display clinical benefits from endocrine therapy after chemotherapy among young breast cancer patients. Methods: A total of 1,171 patients who were under 40 years old at diagnosis between 1985 and 2007 were divided into 3 subgroups: ≤30 years (Group I, 13.3%), 31-35 years (Group II, 30.5%), and 36-40 years (Control group, 56.2%). Clinicopathological factors and outcomes were compared using a chi-square test, the Kaplan-Meier method, and Cox’s hazards models. Results: There were no significant differences in the characteristics and treatment patterns between the 3 groups, except for the grade, hormone receptors expression,and use of endocrine therap. Group I showed the worst survival and subsequently Group II presented worse outcomes than the Control group, mainly among hormone receptors-positive patients. Groups I and II showed increased risks of recurrence and death in multivariate analyses. Among 529 hormone receptors-positive patients who received chemotherapy, favorable outcomes for patients who were treated with endocrine agents were demonstrated, mainly in patients aged 35 years or less. However, interaction tests between the use of endocrine therapy and age at diagnosis were not significant. Conclusion: Age at diagnosis is an independent prognostic factor and the age of 35 years is a rational cut-off among young patients. Our subgroup analysis suggests that endocrine therapy may provide additional benefits even in young breast cancers. Therefore, further researches should be directed towards improving outcomes for this population.