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Dumbbell-Type Hyperbranched-Polyglycidol-Assisted Green Synthesis of Metal Nanoparticles
Bae, Jaeyeong,Park, Hui Ju,Kim, Mi-Ra,Kim, Il American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.10
<P>A series of dumbbell-type hyperbranched polyglycidols (dHBPs) with different molecular weights were synthesized via anionic ring-opening multi-branching polymerization of glycidol, using alpha, omega-amine-terminated poly(propylene oxide) (Jeffamine, molecular weight = 230) as an initiator. The degree of polymerization was controlled by the ratio of glycidol monomer to initiator. The dHBP played the dual roles of an efficient reducing agent and a stabilizer in the synthesis of highly watersoluble monometallic Au and Ag, and bimetallic Au@Ag nanoparticles (NPs) in the absence of any additional reducers and surfactants. The dHBP-assisted reduction of the metal ions followed a polyol process, and the synthesized Au NPs and Ag NPs had uniform size distributions with average diameters of 3 +/- 1.5 and 4.8 +/- 2.5 nm, respectively. The size and size distribution of the NPs were controlled by simply varying the concentration of the metal ion precursor and the molecular weight of dHBP. The optical properties of the as-prepared metal nanoparticles were investigated by UV-vis spectroscopy and their structural characteristics were defined by transmission electron microscopy and X-ray diffraction analysis.</P>
Park Jaeyeong,Shin Eunkyoung,Yeom Ji-Hyun,Choi Younkyung,주민주,이민호,Kim Je Hyeong,Bae Jeehyeon,Lee Kangseok 한국미생물학회 2022 The journal of microbiology Vol.60 No.1
Acinetobacter baumannii causes multidrug resistance, leading to fatal infections in humans. In this study, we showed that Lys AB2 P3-His–a hexahistidine-tagged form of an antimicrobial peptide (AMP) loaded onto DNA aptamer-functionalized gold nanoparticles (AuNP-Apt)–can effectively inhibit A. baumannii infection in mice. When A. baumannii-infected mice were intraperitoneally injected with AuNP-Apt loaded with Lys AB2 P3-His, a marked reduction in A. baumannii colonization was observed in the mouse organs, leading to prominently increased survival time and rate of the mice compared to those of the control mice treated with AuNP-Apt or Lys AB2 P3-His only. This study shows that AMPs loaded onto AuNP-Apt could be an effective therapeutic tool against infections caused by multidrug-resistant pathogenic bacteria in humans.
애니로직 시뮬레이션을 이용한 무인지상차량 운용성능과 전투효과의 연관성 분석
이재영(Jaeyeong Lee),신선우(Sunwoo Shin),김준수(Junsoo Kim),배성민(Sungmin Bae),김종만(Chongman Kim) 한국신뢰성학회 2015 신뢰성응용연구 Vol.15 No.2
In modern warfare, the number of unmanned systems grow faster than any other weapon systems. Therefore, it is very important to predict and measure the combat effectiveness (CE) of unmanned weapon systems in battlefield for deciding defense budget to acquire those systems. In general, quantitative calculation of weapon effectiveness under complicated battlefield is difficult based on the future network centric warfare. Hence, many papers studied how to measure the combat effectiveness and tried to study a lot of related issues about it. However, there are few papers dealing with the relationship between the UGV (Unmanned Ground Vehicle)’s performance and CE in a ground battlefield. In this paper, we do the sensitivity analysis based on a given scenario in a small unit battle. In order to do that, we developed simulation model using AnyLogic and changed the input parameters such as detection and hitting probabilities. We also assess the simulation outputs according to the variation of input parameters. The MOE used in this simulation model output is survival ratio for Blue force. We hope that this paper will be useful to find which input variable is more effective to increase combat effectiveness in a small unit ground battlefield.
Catalyst-free ultrasonic-promoted multicomponent synthesis of tertiary α-amino phosphonates
Kalla, Reddi Mohan Naidu,Bae, Jaeyeong,Kim, Il The Royal Society of Chemistry 2017 NEW JOURNAL OF CHEMISTRY Vol.41 No.14
<▼1><P>A highly efficient and green protocol has been developed for the synthesis of novel tertiary α-amino phosphonates <I>via</I> a catalyst-free multi-component Kabachnik–Fields reaction under ultrasound irradiation.</P></▼1><▼2><P>A highly efficient and green protocol has been developed for the synthesis of a new class of tertiary α-amino phosphonates (TAPs) <I>via</I> the Kabachnik–Fields reactions of substituted salicylaldehydes and 2-hydroxy naphthaldehyde, di-<I>n</I>-butylamine, and di-or tri-alkylphosphites in water under ultrasound irradiation as well as under conventional conditions. These multi-component reactions were performed at room temperature without using any catalysts in water. The TAPs were obtained in higher yields (84% to 94%) within shorter reaction times (6 min to 35 min) than those of conventional reactions after simple workup and purification procedures.</P></▼2>
통신효과를 고려한 미래지상체계 효과분석 시뮬레이션에 대한 연구
신선우(Sunwoo Shin),이재영(Jaeyeong Lee),배성민(Sungmin Bae),김종만(Chongman Kim) 한국신뢰성학회 2017 신뢰성응용연구 Vol.17 No.2
Purpose: In this research, we develop an effectiveness analysis simulation model using Agent Based Modeling with Communication Effects for the development of a new weapon system. Methods: To describe the future battlefield that has more complexity, we develop Agent Based Modeling to describe communication Effects. We use the communication theory (Path-Loss Model) and the real map. Results: We have compared simulation model with real map and simulation model without real map. The Blue Survival Ratio of simulation model with real map is worse than one without real map since the performance of communication gets lower. Conclusion: There are many studies about the effectiveness analysis of a weapon system. Most of previous researches assumed no communication error. In the real world, however, it’s not appropriate assumption. Therefore, this study considers the communication error and shows that it is important factor in the effectiveness analysis.