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Label Smoothing in Motor Imagery Decoding
Permana Deny(데니퍼마나),Kae Won Choi(최계원) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
This article proposes a label smoothing in motor imagery decoding to reduce overfitting and over-confident. The result suggests that the approach helps to improve the performance by 5%.
Prospecting for Insect Pheromones in Indonesia: Finds, Failures and the Future
Angerilli, N.P.D.,Permana, A.D.,Sasaerila, Y.,Hallett, R.,Zilahi-Balogh, R.,Edmonds, R. Korean Society of Applied Entomology 1998 Journal of Asia-Pacific Entomology Vol.1 No.1
The isolation, identification and application of pheromones in agriculture and forestry in Indonesia is beginning and is of increasing importance in the official government strategy of pest management. As the fourth most populous country in the world, home to some of the largest remaining tropical rainforests and undergoing rapid industrualization, there are a variety of powerful reasons for Indonesia to continue to develop and implement IPM prograns that are effective, readily available and user-friendly. Many IPM programs will be benefited from the inclusion of a pheromone-based component. Several recent pheromone research projects, undertaken in Indonesia to identify and develop pheromones as tools in IPM programs, were examined. These include diamondback moth(Plutella xylostella(L.)); soybean pod borer(Etiella zinckenella Trietschke and E. hobsoni Butler); sugar cane top borer(Scirpophaga nivella F.); and some coleopteran and other pests of palm(Oryctes rhinoceros(L.), Rhynchophorus ferrugineus(Olivier), R. vulneratus(Panzer) and Setothosea asigna(vE)). The nature of the pheromone was discussed in each case and how the pheromone information can be of assistance in IPM programs involving these insect pests was reviewed. Some obstacles to pheromone research as well as some of the limitations to the inclusion the influence of difficulties in communication and access to information, bureaucracy and the acquisition of equipment and supplies are not uncommon. Further, communication of research results as well as the general level of capitalization of agricultural effort in addition to grower sociocultural factors can be problematic. However there are a large number of opportunities for productive pheromone research and we present an active 'hot' list of target insect/crop combinations which are likely to prove rewarding. Facilitation of a continuous indigenous research effort involv-ing pheromones is being achieved through the development and strengthening of a Pheromone and Semiochemical Research Group centered at the Bandung Institute of Technology.
Dwivedi, Amarendra Dhar,Permana, Rega,Singh, Jitendra Pal,Yoon, Hakwon,Chae, Keun Hwa,Chang, Yoon-Seok,Hwang, Dong Soo Elsevier 2017 Chemical engineering journal Vol.328 No.-
<P><B>Abstract</B></P> <P>Inspired by naturally occurring metal chelation strategy by pyrogallol moiety of tunichromes of marine tunicates, a strong retention of carcinogenic chromium (Cr<SUP>VI</SUP>) is described by mimicking tunichrome matrix as a proof-of-concept investigation in water treatment applications. Harvesting tunichromes tailored with the pyrogallol moiety are extremely difficult owing to aerial sensitivity and purification difficulties, thus proving a challenging synthesis problem. Despite significant interest, knowledge of specific metal coordination in tunicate’s matrix is still ambiguous, hindering study scope. We planned to fabricate a promising tunichrome matrix (TM) tailored with pyrogallol moieties from the Earth-abundant raw materials (gallic acid and chitin nanofiber) at mass scale without artificial aid. Specifically, we aimed at atomistic understanding of contaminant and pyrogallol moiety of TM by examining the structural parameters (redox change, geometrical distortion, coordination bond). Cr <I>K</I>-edge extended X-ray absorption fine structure (EXAFS) corresponds well to nontoxic Cr<SUP>III</SUP> (average four CrO bond lengths of 1.91Å) and a small fraction of Cr<SUP>VI</SUP> (average two CrO bond lengths of 1.62Å). A coupled reductive complexation mechanism was identified by combining near edge X-ray absorption fine structure (NEXAFS) and linear combination fits. From the viewpoint of practical utility and effective performance (nearly 119mg chromium per g weight of TM), the impacts of water chemistry conditions were investigated from a variety of contaminated waters, showing a distinct improvement compared to conventional popular materials. The gained knowledge would be beneficial for utilizing a pyrogallol moiety as an alternative greener and sustainable scavenger, specifically for toxic chromium.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A newly designed nano-bio tool inspired by marine tunicate, a filter feeder. </LI> <LI> Superior retention of Cr<SUP>VI</SUP> by mimicking tunichrome matrix in remediation treatment. </LI> <LI> Pyrogallol – a primary factor in increased efficiency as a proof-of-concept study. </LI> <LI> First comprehensive report on tunichrome’s chromium metal coordination chemistry. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Dwivedi, Amarendra Dhar,Permana, Rega,Singh, Jitendra Pal,Yoon, Hakwon,Chae, Keun Hwa,Chang, Yoon-Seok,Hwang, Dong Soo American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.23
<P>Tunicate, a filter-feeder in seawater, is able to accumulate high amount of metals using intracellular polymer matrices. The woven pyrogallol structures of tunichrome, a small peptide contained in tunicate's blood;Cells, is believed to, be responsible for selective. metal sequestration in tunicates from seawater. However, the intriguing tunichrome matrix is difficult both to harvest from the tunicate and to synthesize massively due to the-extreme oxidation sensitivity of the pyrogallol, moiety which limits the study scope. Here, we succeeded to mimic tunichrome by conjugating two cheap and naturally occurring components: pyrogallol-5-carboxylic acid (gallic acid) and chitin. nanofiber A tunicate-mimetic infiltration matrix of surface-tailored chitin nanofibers with pyrogallol moieties (CGa) demonstrated the versatility of this strategy in generation of ingenious filtration material, especially for unprecedented fine and-Clean gold recovery inside of the tunicate-mimetic infiltration matrix (>99%, 533 mg gold per gram weight), which exceeds that of the,presently most popular materials. Complexation between pyrogallol on the nanofiber and gold-was similar to that of a tunichrome's metal sequestration. Extended X-ray absorption fine Structure, (EXAFS); spectroscopy and data-fitting, elucidated the decreased coordination numbers for Au-Au nearest neighbors, demonstrating that gold coordinated to pyrogallol units, followed by an intramolecular association of Au-0. A catalytic reduction of 4-nitrophenol mediated by the-tunicate-mimetic matrix with harvested gold revealed excellent recyclability up to 30 cycles (similar to 95% reduction), which together with methylene-blue reduction and antimicrobial performances indicates the versatile characteristics,of sustainable processes by the tunichrome mimetics. This strategy opens the door for fast-developing new biomimetic alternatives for precious metal recovery, which is not restricted to gold and can offer a tool for multifaceted soft/hard nanomaterials..</P>
Jeon, H.S.,Chandra Permana, A.D.,Kim, J.,Min, B.K. Pergamon Press ; Elsevier Science Ltd 2013 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.38 No.14
In water electrolysis, a major obstacle is the anodic reaction for water oxidation where substantial energy loss occurs mainly due to the large overpotential. Therefore, the electrocatalytic material of an anode is of importance to achieve a highly efficient water splitting reaction. Among the various requirements, the surface area of electrocatalysts has been considered a key factor in electrocatalytic reactions. In this study, to obtain a high surface area RuO<SUB>2</SUB> electrocatalyst, a supercritical hydrothermal synthetic method was applied. Indeed, RuO<SUB>2</SUB> particles with the surface area of 78.2 m<SUP>2</SUP>/g were successfully synthesized, which is 7 times higher compared with the commercial version. We also investigated the electrocatalytic activity of the synthesized high surface area RuO<SUB>2</SUB> by evaluating the number of active sites and hydrogen production rates and compared them with the commercial one as a reference. Based on the cyclic voltammetric measurements, the number of active sites was estimated to be 152.1 mC cm<SUP>-2</SUP> and 17.0 mC cm<SUP>-2</SUP> for the synthetic and the commercial RuO<SUB>2</SUB>, respectively. More importantly, the hydrogen production rates measured by the water splitting device with RuO<SUB>2</SUB> films for the anode showed 4 times higher value for the synthetic RuO<SUB>2</SUB> compared with the commercial one.
Impact of COVID-19 on Global Stock Market Volatility
Teresia Angelia Kusumahadi,Fikri C Permana 세종대학교 경제통합연구소 2021 Journal of Economic Integration Vol.36 No.1
This study aims to examine the impact of COVID-19 on stock return volatility in 15 countries worldwide. Using daily data from January 2019 to June 2020, we find that changes in exchange rates have negatively affected stock returns in most countries. We also identify structural changes over the observation period; these structural changes occur not just after the first case of COVID-19 but also earlier in the period. Based on threshold generalized autoregressive conditional heteroskedasticity regressions, we find evidence that the emergence of COVID-19 affected stock return volatility in all observed countries except the United Kingdom. Furthermore, we find that the presence of COVID-19 in a country positively affects return volatility. However, the magnitude of this effect is small in every observed country. This finding suggests the need for in-depth studies of other factors that affect stock return volatility besides the occurrence of COVID-19.