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RandomCast: An Energy-Efficient Communication Scheme for Mobile Ad Hoc Networks
Sunho Lim,Chansu Yu,Das, C.R. IEEE 2009 IEEE transactions on mobile computing Vol.8 No.8
<P>In mobile ad hoc networks (MANETs), every node overhears every data transmission occurring in its vicinity and thus, consumes energy unnecessarily. However, since some MANET routing protocols such as dynamic source routing (DSR) collect route information via overhearing, they would suffer if they are used in combination with 802.11 PSM. Allowing no overhearing may critically deteriorate the performance of the underlying routing protocol, while unconditional overhearing may offset the advantage of using PSM. This paper proposes a new communication mechanism, called RandomCast, via which a sender can specify the desired level of overhearing, making a prudent balance between energy and routing performance. In addition, it reduces redundant rebroadcasts for a broadcast packet, and thus, saves more energy. Extensive simulation using NS-2 shows that RandomCast is highly energy-efficient compared to conventional 802.11 as well as 802.11 PSM-based schemes, in terms of total energy consumption, energy goodput, and energy balance.</P>
반도체 본딩 불량 검출을 위한 U-Net 기반 X선 영상 배경 제거
임선호(Sunho Lim),조승룡(Seungryong Cho),이태원(Taewon Lee) 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.11
Semiconductor packaging technology has been developing in response to the demand for high performance and miniaturization of electronic products. X-rays are inevitably used to detect defects due to bonding methods using wires and bumps used in highly integrated semiconductor chips. However, in the case of an inspection method using a computed tomography (CT) scan, productivity is lowered due to a long imaging time, and more defects are caused due to an increase in the dose to the semiconductor chip. To solve this problem, in this paper, we proposed a preprocessing method that uses U-Net to remove the background information, not the part to be inspected, from the 2D X-ray image of the semiconductor chip, and it was confirmed that the background was successfully removed.
Lim, Sangchul,Ahn, Taekook,Lee, Seunghoon,Park, Sunho Elsevier 2017 Fuel Vol.210 No.-
<P><B>Abstract</B></P> <P>Soot particles of various organic carbon (OC) contents were generated with a triple co-flow burner. TEM images showed that the primary particle boundaries were more ambiguous when OC contents were high. A set of diode lasers of various wavelengths and a white light source were used to measure light extinction over a wide range of wavelengths (450–850nm), and the logarithm of the light intensity ratio was plotted asa function of the inverse of the various wavelengths. The slopes of the plot were taken from the both ends of the wavelength range, and their ratio was calculated. The results show that when the OC contents are high, the ratio increases to approximately 10, whereas the ratio remains nearly constant at a value of 1 when the OC contents are minimal. The analysis of the slope ratios shows that the wavelength-dependent absorption behavior of soot does not depend on the soot volume fraction or the soot particle size; rather, the slope ratio depends only on the soot’s refractive index, which in turn is related to its OC contents. In addition, the soot volume fraction and OC contents can be simultaneously identified without any chemical analysis based on the pre-determined relationship between the slope ratio and the organic fraction of soot.</P>
Jeong, Sunho,Woo, Kyoohee,Kim, Dongjo,Lim, Soonkwon,Kim, Jang Sub,Shin, Hyunjung,Xia, Younan,Moon, Jooho WILEY-VCH Verlag 2008 Advanced Functional Materials Vol.18 No.5
<P>With the aim of preparing a high performance conductive ink, we sought to control the surface chemistry of Cu nanoparticles so as to minimize surface oxidation. Specifically, the surface oxide layer on Cu nanoparticles synthesized in ambient atmosphere was minimized by adjusting the molecular weight of poly(N-vinylpyrrolidone) capping molecules, as confirmed by high resolution transmission electron microscopy and X-ray photoelectron spectroscopy analyses. In addition, we demonstrate that by minimizing the thickness of the surface oxide layer, Cu granular films with good conductivity could be obtained by sintering nanoparticle assembles. Finally, we fabricated highly conductive Cu patterns on a plastic substrate by ink-jet printing.</P> <B>Graphic Abstract</B> <P>Cu nanoparticle-based conductive ink-jet printable inks: To prepare a high performance conductive ink, the surface oxide layer on Cu nanoparticles synthesized in ambient atmosphere was minimized by adjusting the molecular weight of poly(N-vinylpyrrolidone) capping molecules. By minimizing the thickness of the layer, Cu granular films on a plastic substrate with good conductivity could be obtained by sintering nanoparticle assembles. <img src='wiley_img/1616301X-2008-18-5-ADFM200700902-content.gif' alt='wiley_img/1616301X-2008-18-5-ADFM200700902-content'> </P>
Jeong, Sunho,Woo, Kyoohee,Kim, Dongjo,Lim, Soonkwon,Kim, Jang Sub,Shin, Hyunjung,Xia, Younan,Moon, Jooho WILEY-VCH Verlag 2008 Advanced Functional Materials Vol.18 No.5
<B>Graphic Abstract</B> <P>With the aim of preparing a high-performance conductive ink, the surface oxide layer on Cu nanoparticles synthesized in ambient atmosphere is minimized by adjusting the molecular weight of poly(N-vinylpyrrolidone) capping molecules. On p. 679, Joohoo Moon andco-workers demonstrate that by minimizing the thickness of the surface oxide layer, Cu granular films with good conductivity on a plastic substrate can be obtained by sintering nanoparticle assembles. <img src='wiley_img/1616301X-2008-18-5-ADFM200890021-content.gif' alt='wiley_img/1616301X-2008-18-5-ADFM200890021-content'> </P>
Controlled extracellular topographical and chemical cues for acceleration of neuronal development
Park, Sunho,Choi, Kyoung Soon,Kim, Daun,Kim, Woochan,Lee, Dohyeon,Kim, Hong-Nam,Hyun, Hoon,Lim, Ki-Taek,Kim, Jin-Woo,Kim, Yang-Rae,Kim, Jangho Elsevier 2018 Journal of industrial and engineering chemistry Vol.61 No.-
<P><B>Abstract</B></P> <P>Physical and chemical cues, which have emerged as a promising strategy for regulating cellular behaviors, provide important signaling cues to living cells. Neurons are also exposed to distinguishing physical and chemical environments that can greatly influence their behaviors and functions. In this study, we proposed the laminin-coated matrix nanotopography platforms (LMNPs) that generate extracellular physical and chemical cues for neuronal development. Using our platforms, we showed that nanotopographical and biochemical cues could provide suitable environments for neuronal cultures. More importantly, we showed that a LMNPs could control the orientation of neuronal structures as well as accelerate neuronal development through synergistic effects of extracellular nanotopographical and chemical cues. Our study imparts new design principles on the role of nanotopographical and chemical cues in neuronal development for the fabrication of neuroprosthetic scaffolds.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>