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Odongo Steven Eyobu(오돈고스티븐요부),Jhihoon Joo(주지훈),Dong Seog Han(한동석) 한국방송·미디어공학회 2015 한국방송공학회 학술발표대회 논문집 Vol.2015 No.7
In any mobile ad hoc environment, collision amongst mobile objects is always likely to occur unless there is a certain level of intelligence to detect and avoid the collision. This phenomenon of detection and avoidance is the key attribute for safety applications in vehicle to pedestrian (V2P) communications systems. In this paper, we propose a V2P communications concept for collision detection and avoidance.
Poverty Reduction in Sub-Saharan Africa: What Promise Does Civil Society Hold?
( Odongo Nicholas ) 한국정책학회 2022 International Journal of Policy Studies Vol.13 No.2
This study aims at demonstrating civil society’s integral role in poverty reduction through its participation in and enhancement of the public policy process. I argue that civil society participation in public policy is the missing link in the fight against poverty in the continent. Through a multiple comparative panel regression analysis of 43 African countries, this study assesses the impact of civil society participation in public policy on out-of-pocket health expenditure per capita. Findings show that civil society participation in public policy led to pro-poor policies that contributed to reduced out-of-pocket health expenditure per capita, demonstrating how participation in public policy is instrumental and strategic for poverty reduction. The study highlights the empirical evidence needed to establish the indispensability of and desire to support civil society and institutionalize civil society participatory processes in public policy for the effective and efficient reduction of poverty in Sub-Saharan Africa.
Odongo Ngome, Francis Okello,Kim, Young-Tae,Lee, Hyeon-Dong,Kim, Young-Hoon,Lee, Tae-Woo,Park, Chan-Gyung The Royal Society of Chemistry 2017 Journal of Materials Chemistry C Vol.5 No.37
<▼1><P>We successfully control the Ir(ppy)3 needle-like aggregates in small-molecule based emitting layers by solvent mixture for improving the properties of OLEDs.</P></▼1><▼2><P>The morphology of emitting layers (EMLs) plays a vital role in determining the overall performance of solution processed phosphorescent organic light emitting diodes (PhOLEDs). Herein, the morphology of undoped small molecule binary blend EMLs prepared by blending tris(4-carbazoyle-9-ylphenyl)amine (TCTA) hole transport material (HTM) with a series of electron transport materials (ETMLs) was studied using a transmission electron microscope (TEM). Experimental results show that phase separation of the binary blend EMLs significantly depends on the polarity of the host. The binary blend ELMs were further doped with tris(2-phenylpyridine)iridium(iii) (Ir(ppy)3) to form ternary blend EMLs and the resulting morphology was examined using scanning transmission electron microscopy-energy dispersive X-ray spectroscopy (STEM-EDS). The results report for the first time the existence of Ir(ppy)3 needle-like aggregates in small molecule ternary blend EMLs. By comparing the size of the aggregates formed in small molecule ternary blend EMLs with those formed in polymer–small molecule blends, our results showed that small molecule blend EMLs exhibit minimal Ir(ppy)3 aggregates with a low aspect ratio in contrast to polymer–small molecule blends. The effect of mixed solvent on the distribution of the aggregates was also examined using a TEM and an atomic force microscope (AFM). The disappearance of the aggregates with varying solvent mixture ratios signifies that solvent mixture is an effective way to control homogeneous distribution of Ir(ppy)3 in the emitting layers of PhOLEDs. This was further evidenced by an improvement in light emitting efficiency and current efficiency of OLED devices fabricated using a mixed solvent.</P></▼2>
TEM sample preparation using micro-manipulator for in-situ MEMS experiment
이현종,Odongo Francis Ngome Okello,김기엽,송경,최시영 한국현미경학회 2021 Applied microscopy Vol.51 No.1
Growing demands for comprehending complicated nano-scale phenomena in atomic resolution has attracted in-situ transmission electron microscopy (TEM) techniques for understanding their dynamics. However, simple to safe TEM sample preparation for in-situ observation has been limited. Here, we suggested the optical microscopy based micro-manipulating system for transferring TEM samples. By adopting our manipulator system, several types of samples from nano-wires to plate-like thin samples were transferred on micro-electro mechanical systems (MEMS) chip in a single step. Furthermore, the control of electrostatic force between the sample and the probe tip is found to be a key role in transferring process.