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Fast Underwater Image Mosaicing through Submapping
Elibol, A.,Kim, J.,Gracias, N.,Garcia, R. Springer Science + Business Media 2017 JOURNAL OF INTELLIGENT AND ROBOTIC SYSTEMS Vol.85 No.1
<P>One of the most important features of mobile robots is their capability to gather data from areas beyond human reach. This capability has increased the demand for the use of robots undertaking exploration tasks, which has naturally led to the need for efficient methods to process the obtained data. Image mosaicing is a useful tool for obtaining a high-resolution visual representation of a large area that has been explored using optical sensors. In this paper, we present an efficient image mosaicing approach that utilizes submapping methods to obtain a map of a surveyed area with reduced computational effort. The approach uses a modified agglomerative hierarchical clustering method to form submaps according to similarity information obtained through feature descriptor matching, and takes advantage of this submapping to reduce the computation and time costs. Comparative results on real challenging underwater datasets are presented.</P>
Fabrication and characterization of RF nanoantenna on a nanoliter-scale 3D microcontainer
Park, Jung-rae,Choi, Daniel S,Gracias, D H,Leong, T G,Presser, N,Stupian, G W,Leung, M S,Kim, Young Keun IOP Pub 2011 Nanotechnology Vol.22 No.45
<P>We report the design and fabrication of a nanoantenna structure on the surface of a 3D nanoliter-scale container for the development of communicable nanoliter-scale chemical delivery systems. The porous container was self-assembled, after which the nanoantenna was fabricated on the top of the microcontainer using focused ion beam (FIB) ion-induced metal deposition. The nanoantenna was structured as a rectangular metal coil composed of platinum (Pt) nanowires (70 nm in width). The response of the nanoantenna structure was simulated using finite element software and showed a strong resonant feature at 10.8 GHz, which was confirmed by high frequency measurements. </P>
Hyperthermia with Magnetic Nanowires for Inactivating Living Cells
Choi, D. S.,Park, J.,Kim, S.,Gracias, D. H.,Cho, M. K.,Kim, Y. K.,Fung, A.,Lee, S. E.,Chen, Y.,Khanal, S.,Baral, S.,Kim, J.-H. American Scientific Publishers 2008 Journal of Nanoscience and Nanotechnology Vol.8 No.5
<P>We describe a method to induce hyperthermia in cells, <I>in-vitro</I>, by remotely heating Ni nanowires (NWs) with radio frequency (RF) electromagnetic fields. Ni NWs were internalized by human embryonic kidney cells (HEK-293). Only cells proximal to NWs or with internalized NWs changed shape on exposure to RF fields indicative of cell death. The cell death occurs as a result of hyperthermia, since the RF field remotely heats the NWs as a result of magnetic hysteresis. This is the first demonstration of hyperthermia induced by NWs; since the NWs have anisotropic and strong magnetic moments, our experiments suggest the possibility of performing hyperthermia at lower field strengths in order to minimize damage to untargeted cells in applications such as the treatment of cancer.</P>
SELF-ASSEMBLY OF THREE-DIMENSIONAL NANOPOROUS CONTAINERS
JAIHAI WANG,MIRA PATEL,DAVID H. GRACIAS 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2009 NANO Vol.4 No.1
We describe a strategy to construct three-dimensional (3D) containers with nanoporous walls by the self-assembly of lithographically patterned two-dimensional cruciforms with solderhinges. The first step involves fabricating two-dimensional (2D) cruciforms composed of six unlinked patterns: each pattern has an open window. The second step entails photolithographic patterning of solder hinges that connect the cruciform. The third step involves the deposition of polystyrene particles within the windows and the subsequent electrodeposition of metal in the voids between the polystyrene particles. Following the dissolution of the particles, the cruciforms are released from the substrate and heated above the melting point of the solder causing the cruciforms to spontaneously fold up into 3D cubic containers with nanoporous walls. We believe these 3D containers with nanoporous side walls are promising for molecular separations and cell-based therapies.
Online underwater optical mapping for trajectories with gaps
Elibol, A.,Shim, H.,Hong, S.,Kim, J.,Gracias, N.,Garcia, R. SPRINGER SCIENCE + BUSINESS MEDIA 2016 INTELLIGENT SERVICE ROBOTICS Vol.9 No.3
<P>This paper proposes a vision-only online mosaicing method for underwater surveys. Our method tackles a common problem in low-cost imaging platforms, where complementary navigation sensors produce imprecise or even missing measurements. Under these circumstances, the success of the optical mapping depends on the continuity of the acquired video stream. However, this continuity cannot be always guaranteed due to the motion blurs or lack of texture, common in underwater scenarios. Such temporal gaps hinder the extraction of reliable motion estimates from visual odometry, and compromise the ability to infer the presence of loops for producing an adequate optical map. Unlike traditional underwater mosaicing methods, our proposal can handle camera trajectories with gaps between time-consecutive images. This is achieved by constructing minimum spanning tree which verifies whether the current topology is connected or not. To do so, we embed a trajectory estimate correction step based on graph theory algorithms. The proposed method was tested with several different underwater image sequences and results were presented to illustrate the performance.</P>
Reversible MoS<sub>2</sub> Origami with Spatially Resolved and Reconfigurable Photosensitivity
Xu, Weinan,Li, Tengfei,Qin, Zhao,Huang, Qi,Gao, Hui,Kang, Kibum,Park, Jiwoong,Buehler, Markus J.,Khurgin, Jacob B.,Gracias, David H. American Chemical Society 2019 Nano letters Vol.19 No.11
<P>Two-dimensional layered materials (2DLMs) have been extensively studied in a variety of planar optoelectronic devices. Three-dimensional (3D) optoelectronic structures offer unique advantages including omnidirectional responses, multipolar detection, and enhanced light-matter interactions. However, there has been limited success in transforming monolayer 2DLMs into reconfigurable 3D optoelectronic devices due to challenges in microfabrication and integration of these materials in truly 3D geometries. Here, we report an origami-inspired self-folding approach to reversibly transform monolayer molybdenum disulfide (MoS<SUB>2</SUB>) into functional 3D optoelectronic devices. We pattern and integrate monolayer MoS<SUB>2</SUB> and gold (Au) onto differentially photo-cross-linked thin polymer (SU8) films. The devices reversibly self-fold due to swelling gradients in the SU8 films upon solvent exchange. We fabricate a wide variety of optically active 3D MoS<SUB>2</SUB> microstructures including pyramids, cubes, flowers, dodecahedra, and Miura-oris, and we simulate the self-folding mechanism using a coarse-grained mechanics model. Using finite-difference time-domain (FDTD) simulation and optoelectronic characterization, we demonstrate that the 3D self-folded MoS<SUB>2</SUB> structures show enhanced light interaction and are capable of angle-resolved photodetection. Importantly, the structures are also reversibly reconfigurable upon solvent exchange with high tunability in the optical detection area. Our approach provides a versatile strategy to reversibly configure 2D materials in 3D optoelectronic devices of broad relevance to flexible and wearable electronics, biosensing, and robotics.</P> [FIG OMISSION]</BR>
Gracia ONGKOWIJOYO(Gracia ONGKOWIJOYO ),Teman KOESMONO(Teman KOESMONO ),Fenika WULANI(Fenika WULANI ) 한국유통과학회 2022 유통과학연구 Vol.20 No.12
Purpose: This study discusses the phenomenon of the uncertain sustainability of SMEs in developing countries. SMEs face various challenges in the dynamics of a competitive environment, which threaten their growth and sustainability. This study aims to address a research gap between company's internal resources, in the form of absorptive capacity, and its business performance. By using product quality as a mediator, which has never been studied before, this research presents a novelty to answer the existing research gap using the Resource Based Theory (RBT) perspective. Research design, data and methodology: Using quantitative method, data are collected from 164 respondents, who are owners or managers of furniture manufacturing SMEs in Gerbangkertosusila Area, East Java, Indonesia. The data are analyzed using Partial Least Square (PLS) – Structural Equation Modeling (SEM). Results: The findings show that absorptive capacity has a direct and significant effect on business performance and indirectly through product quality. Conclusion: Furniture manufacturing SMEs are advised to focus on developing absorptive capacity reflected in good product quality, in order to improve their business performance. This is especially important to survive the crisis caused by the Covid-19 pandemic. Thus, the results of this study contribute to the development of RBT, and there are several suggestions for further research.
Development of strategies to manufacture low-salt meat products - a review
( Gracia Henreita Suci Aprilia ),( Hyeong Sang Kim ) 한국축산학회 2022 한국축산학회지 Vol.64 No.2
Urbanization is usually followed by changes in eating habits, with a specific trend toward the consumption of ready-to-eat products, such as processed foods. Among the latter, meat products are known contributors to high dietary sodium owing to salt addition. Salt plays an essential role in maintaining the quality of meat products in terms of acceptability and safety. However, an excessive salt intake is linked to high blood pressure and cardiovascular diseases. Hence, several studies have been competing for the discovery of salt alternatives performing in a similar way as common salt. A number of replacements have been proposed to reduce salt consumption in meat products while taking into account consumer preferences. Unfortunately, these have resulted in poorer product quality, followed by new adverse effects on health. This review addresses these recent issues by illustrating some established approaches and providing insight into further challenges in developing low-salt meat products.