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Contour detection with bicubic spline surfaces

International Journal of Digital Earth 2023年第1期16卷 1801-1827页

作者： Hiroyuki Goto taiki otsuka Department of Industrial and Systems Engineering Hosei UniversityTokyoJapan Faculty of IT and Business Cyber UniversityTokyoJapan

Contour detection has a rich history in multiplefields such as geography,engineering,and earth *** predominant approach is based on piecewise planar tessellation and now being challenged concerning the extraction of contour objects for non-linear elevation functions,particularly with respect to bicubic spline functions.A storage-efficient method was developed in previous research,but the detection of the complete set of contour objects is yet to be *** intractable,theoretical underpinnings pertinent to curvature resulted in an approach to realize the complete detection of *** a digital elevation model dataset,in this study,a bicubic spline surface function wasfirst ***,candidate initial points on the edges across the region of interest were identified,and the recursive disaggregation of rectangles was repeated if the non-existence of a solution could not be assured.A developed tracking method was then *** advancement,other initial points on the same contour curve were identified and eliminated to circumvent duplicate *** completeness of the outlets provides analytical tools for elevation and other geographical *** experiments included the development of a three-dimensional contour-based network and slope *** latter application transforms the slope analysis type from raster-based to *** of a complete set of contour objects amenable to bicubic spline surfaces..Small closure inside a single patch is detectable if size exceeds the standard..Curvature&tolerances central to step length adjustment and tangent angle determination..Redundant initial points are identified and eliminated during the tracking process..Various potential applications in addition to geographical elevations.

关键词： Contour detection bicubic spline surface curvature tolerance patch disaggregation

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Dynamic Hand Gesture-Based Person Identification Using Leap Motion and Machine Learning Approaches

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Computers, Materials & Continua 2024年第4期79卷 1205-1222页

作者： Jungpil Shin Md.AlMehedi Hasan Md.Maniruzzaman taiki Watanabe Issei Jozume School of Computer Science and Engineering The University of AizuAizuwakamatsuFukushima965-8580Japan Department of Computer Science&Engineering Rajshahi University of Engineering&TechnologyRajshahi6204Bangladesh

Person identification is one of the most vital tasks for network security. People are more concerned about theirsecurity due to traditional passwords becoming weaker or leaking in various attacks. In recent decades, fingerprintsand faces have been widely used for person identification, which has the risk of information leakage as a resultof reproducing fingers or faces by taking a snapshot. Recently, people have focused on creating an identifiablepattern, which will not be reproducible falsely by capturing psychological and behavioral information of a personusing vision and sensor-based techniques. In existing studies, most of the researchers used very complex patternsin this direction, which need special training and attention to remember the patterns and failed to capturethe psychological and behavioral information of a person properly. To overcome these problems, this researchdevised a novel dynamic hand gesture-based person identification system using a Leap Motion sensor. Thisstudy developed two hand gesture-based pattern datasets for performing the experiments, which contained morethan 500 samples, collected from 25 subjects. Various static and dynamic features were extracted from the handgeometry. Randomforest was used to measure feature importance using the Gini Index. Finally, the support vectormachinewas implemented for person identification and evaluate its performance using identification accuracy. Theexperimental results showed that the proposed system produced an identification accuracy of 99.8% for arbitraryhand gesture-based patterns and 99.6% for the same dynamic hand gesture-based patterns. This result indicatedthat the proposed system can be used for person identification in the field of security.

关键词： Person identification leap motion hand gesture random forest support vector machine

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Water-assisted self-sustained burning of metallic single-walled carbon nanotubes for scalable transistor fabrication

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Nano Research 2017年第9期10卷 3248-3260页

作者： Keigo otsuka taiki Inoue Yuki Shimomura Shohei Chiashi Shigeo Maruyama Department of Mechanical Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Energy NanoEngineering Lab. National Institute of Advanced Industrial Science and Technology (AIST) 1-2-1 Namiki Tsukuba 305-8564 Japan

Although aligned arrays of semiconducting single-walled carbon nanotubes (s-SWNTs) are promising for use in next-generation electronics owing to their ultrathin bodies and ideal electrical properties, even a small portion of metallic (m-) counterparts causes excessive leakage in field-effect transistors (FETs). To fully exploit the benefits of s-SWNTs for use in large-scale systems, it is necessary to completely eliminate m-SWNTs from as-grown SWNT arrays and thereby obtain purely semiconducting large-area arrays, wherein numerous FETs can be flexibly built. In this study, we performed electrical burning of m-SWNTs assisted by water vapor and polymer coating to eliminate m-SWNTs over a long length for the scalable fabrication of transistors from the remaining s-SWNT arrays. During the electrical-breakdown process, the combination of water vapor and the polymer coating significantly enhanced the burning of the SWNTs, resulting in a self-sustained reaction along the nanotube axis. We found that m-SWNT segments partially remaining on the anode side resulted from one-way burning from the initial breakdown position, where Joule-heating-induced oxidation first occurred. The s-SWNT-enriched arrays obtained were used to fabricate multiple FETs with a high on-off current ratio. The results indicate the advantages of this approach over conventional electrical breakdown for the large-scale purification of s-SWNTs.

关键词： single-walled carbon nanotubes field-effect transistor selective removal electrical breakdown one-way burning

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Effects of tropical forest conversion into oil palm plantations on nitrous oxide emissions:A meta-analysis

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Journal of Forestry Research 2023年第3期34卷 865-869页

作者： taiki Mori Kyushu Research Center Forestry and Forest Products Research InstituteFFPRIKurokami 4-11-16Kumamoto 860-0862Japan

Oil palm plantations have dramatically expanded in tropical Asia over the past *** their establishment has been projected to increase nitrous oxide(N_(2)O)emissions,earlier reports have shown inconsistent *** study analyzed these previously published data to compare N_(2)O emissions in oil palm plantations to reference forests.A linear mixed-eff ects model was used to examine the signifi cance of the eff ect of establishing oil palm plantations on N_(2)O emissions,rather than to calculate mean eff ect sizes because of limitations in the data *** results indicated that N_(2)O emissions were signifi cantly greater from oil palm plantations than from reference forests,as *** is the fi rst study to report the eff ect of oil palm plantations on N_(2)O emissions by synthesizing previously published *** quantify the size of this eff ect,additional studies with frequent and long-term monitoring data are needed.

关键词： Meta-analysis Nitrogen fertilization Nitrous oxide Oil palm plantation Tropical forest

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Coaxial boron nitride nanotubes as interfacial dielectric layers to lower interface trap density in carbon nanotube transistors

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Nano Research 2023年第11期16卷 12840-12848页

作者： Keigo otsuka taiki Sugihara taiki Inoue Weijie Jia Satoru Matsushita Takanobu Saito Minhyeok Lee Takashi Taniguchi Kenji Watanabe Gregory Pitner Ming-Yang Li Tzu-Ang Chao Rong Xiang Shohei Chiashi Shigeo Maruyama Department of Mechanical Engineering The University of TokyoTokyo 113-8656Japan Department of Applied Physics Osaka UniversityOsaka 565-0871Japan Research Center for Materials Nanoarchitectonics National Institute for Materials ScienceTsukuba 305-0044Japan Research Center for Electronic and Optical Materials National Institute for Materials ScienceTsukuba 305-0044Japan Corporate Research Taiwan Semiconductor Manufacturing CompanySan JoseCA 95134USA Corporate Research Taiwan Semiconductor Manufacturing CompanyHsinchu 30078

A semiconductor/dielectric interface is one of the dominant factors in device characteristics,and a variety of oxides with high dielectric constants and low interface trap densities have been used in carbon nanotube *** the crystal structure of nanotubes with no dangling bonds,there remains room to investigate unconventional dielectric ***,we fabricate carbon nanotube transistors with boron nitride nanotubes as interfacial layers between channels and gate dielectrics,where a single semiconducting nanotube is used to focus on switching behaviors at the subthreshold *** subthreshold swing of 68 mV·dec^(−1)is obtained despite a 100-nm-thick Sio_(2)dielectric,corresponding to the effective interface trap density of 5.2×10^(11)cm^(−2)·eV^(−1),one order of magnitude lower than those of carbon nanotube devices without boron nitride *** interfacial layers also result in the mild suppression of threshold voltage variation and *** achieve Ohmic contacts through the selective etching of boron nitride nanotubes with XeF2 gas,overcoming the trade-off imposed by wrapping the inner *** impacts of fluorinating carbon nanotubes on device performances are also confirmed as long as the etching is applied exclusively at source/drain *** results represent an important step toward nanoelectronics that exploit the advantage of one-dimensional van der Waals heterostructures.

关键词： carbon nanotubes hexagonal boron nitride van der Waals interfaces field-effect transistors subthreshold swing selective etching

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Influence of image classification accuracy on saliency map estimation

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CAAI Transactions on Intelligence Technology 2018年第3期3卷 140-152页

作者： taiki Oyama Takao Yamanaka Department of Information and Communication Sciences Sophia University 7-1 Kioi-cho Chiyoda-ku Tokyo 102-0094 Japan

Saliency map estimation in computer vision aims to estimate the locations where people gaze in images. Since people tend to look at objects in images, the parameters of the model pre-trained on ImageNet for image classification are useful for the saliency map estimation. However, there is no research on the relationship between the image classification accuracy and the performance of the saliency map estimation. In this study, it is shown that there is a strong correlation between image classification accuracy and saliency map estimation accuracy. The authors also investigated the effective architecture based on multi-scale images and the up-sampling layers to refine the saliencymap resolution. The model achieved the state-of-the-art accuracy on the PASCAL-S, OSIE, and MIT1003 datasets. In the MIT saliency benchmark, the model achieved the best performance in some metrics and competitive results in the other metrics.

关键词：计算机视觉图像处理发展现状计算机技术

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Investigation of charge interaction between fullerene derivatives and single-walled carbon nanotubes

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InfoMat 2019年第4期1卷 559-570页

作者： Clément Delacou Il Jeon Keigo otsuka taiki Inoue Anton Anisimov Takenori Fujii Esko I.Kauppinen Shigeo Maruyama Yutaka Matsuo Department of Mechanical Engineering The University of TokyoTokyoJapan KU-KIST Green School Graduate School of Energy and Environment Korea UniversitySeoulSouth Korea Nanoscale Quantum Photonics Laboratory RIKENSaitamaJapan Canatu Ltd HelsinkiFinland Cryogenic Research Center The University of TokyoTokyoJapan Department of Applied Physics Aalto University School of ScienceAaltoFinland Energy NanoEngineering Laboratory National Institute of Advanced Industrial Science and Technology(AIST)TsukubaJapan Institutes of Innovation for Future Society Nagoya UniversityNagoyaJapan

The charge interaction and corresponding doping effect between single-walled carbonnanotubes (SWNTs) and various fullerene derivatives, namely, C60, phenyl-C61-butyricacid methyl ester (PC61BM), methano-indenefullerene (MIF), 10,100,40,400-tetrahydrodi[1,4]methanonaphthaleno[5,6]fullerene (ICBA), 1,4-bis(dimethylphenylsilylmethyl)[60]fullerene (SIMEF-1), and dimethyl(orthoanisyl) silylmethyl(dimethylphenylsilylmethyl)[60]fullerene (SIMEF-2), are investigated. A variety of analytical techniques,including field-effect transistors (FETs) made of horizontally aligned arrays ofSWNTs, is used as a means of investigation. Data from different measurements haveto be used to obtain a concrete evaluation for the fullerene-applied SWNTs. The datacollectively points toward the conclusion that fullerenes with high molecular orbitalenergy levels, namely, MIF, SIMEF-1, SIMEF-2, and PC61BM, induce p-type doping,while fullerenes with low molecular orbital energy levels, namely, ICBA and C60,induce n-type doping on the carbon nanotubes. Nevertheless, the SWNTs retained ptypecharacteristics because n-doping induced by the fullerenes are weak compared tothe p-doping of the water and oxygen on carbon nanotubes. This means that fullerenederivatives have the ability to fine-tune the energy levels of carbon nanotubes, whichcan play a crucial role in carbon nanotube-based electronics, such as solar cells, lightemittingdevices, and FETs.

关键词： doping field-effect transistors fullerene single-walled carbon nanotubes thin films

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The responses of carbon-and nitrogen-acquiring enzymes to nitrogen and phosphorus additions in two plantations in southern China

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Journal of Forestry Research 2020年第4期31卷 1319-1324页

作者： Senhao Wang taiki Mori Jiangming Mo Wei Zhang Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems and Guangdong Provincial Key Laboratory of Applied Botany South China Botanical GardenChinese Academy of SciencesGuangzhou 510650GuangdongPeople’s Republic of China Graduate School of Agriculture Kyoto UniversityKitashirakawa Oiwake-choSakyo-kuKyotoJapan University of Chinese Academy of Sciences Beijing 100049People’s Republic of China

In tropical plantations,nutrients such as nitrogen(N)or phosphorus(P)are often applied as management ***,the effects of such nutrient additions on topsoil C-and N-acquiring enzymes activities are *** this study,the impacts of fertilization onβ-1,4-glucosidase(BG),β-D-cellobiosidase(CBH),β-1,4-xylosidase(BX),β-1,4-N-acetyl-glucosaminidase(NAG),and leucine amino peptidase(LAP)enzymes activities from topsoil and litter layer of two tropical plantations(Acacia auriculiformis and Eucalyptus urophylla)were *** results showed that N addition had neutral impact on topsoil enzymes,while significantly elevating the activities of BG,CBH,BX,and NAG in the litter layer.P fertilization had no impacts except for an elevation of NAG in litter *** was no interactions found between N and P additions on these enzyme *** clearer impacts of N over P fertilization were unexpected because that the study site receives a high rate of atmospheric N deposition,and has low soil P *** impact of P fertilization on hydrolytic enzyme activities may be less important compared with that of N.

关键词： Tropical tree plantation Ecoenzymes Fertilization Forest management

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Exploring the hepatitis C virus genome using single molecule realtime sequencing

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World Journal of Gastroenterology 2019年第32期25卷 4661-4672页

作者： Haruhiko Takeda taiki Yamashita Yoshihide Ueda Akihiro Sekine Department of Omics-based Medicine Center for Preventive Medical ScienceChiba UniversityChiba 260-0856Japan Department of Gastroenterology and Hepatology Graduate School of MedicineKyoto UniversityKyoto 606-8507Japan

Single molecular real-time(SMRT)sequencing,also called third-generation sequencing,is a novel sequencing technique capable of generating extremely long contiguous sequence *** conventional short-read sequencing cannot evaluate the linkage of nucleotide substitutions distant from one another,SMRT sequencing can directly demonstrate linkage of nucleotide changes over a span of more than 20 kbp,and thus can be applied to directly examine the haplotypes of viruses or bacteria whose genome structures are changing in real *** addition,an error correction method(circular consensus sequencing)has been established and repeated sequencing of a single-molecule DNA template can result in extremely high *** advantages of long read sequencing enable accurate determination of the haplotypes of individual viral *** sequencing has been applied in various studies of viral genomes including determination of the full-length contiguous genome sequence of hepatitis C virus(HCV),targeted deep sequencing of the HCV NS5A gene,and assessment of heterogeneity among viral ***,the emergence of multi-drug resistant HCV viruses has become a significant clinical issue and has been also demonstrated using SMRT *** this review,we introduce the novel third-generation PacBio RSII/Sequel systems,compare them with conventional next-generation sequencers,and summarize previous studies in which SMRT sequencing technology has been applied for HCV genome *** also refer to another long-read sequencing platform,nanopore sequencing technology,and discuss the advantages,limitations and future perspectives in using these thirdgeneration sequencers for HCV genome analysis.

关键词： Third generation sequencing PacBio RSII Single molecule real-time sequencing Hepatitis C virus Resistance-associated substitution Nanopore sequencer

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Psychophysical Neuroeconomics of Decision Making: Nonlinear Time Perception Commonly Explains Anomalies in Temporal and Probability Discounting

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Applied Mathematics 2013年第11期4卷 1520-1525页

作者： taiki Takahashi Ruokang Han Center for Experimental Research in Social Science Department of Behavioral Science Faculty of Letters Hokkaido University Sapporo Japan

Anomalies in decision over time (e.g., “hyperbolic time discounting”) and under risk (e.g., Allais paradox and hyperbolic probability discounting) have been attracting attention in behavioral and neuroeconomics. We have proposed that psychophysical time commonly explains anomalies in both decisions (Takahashi, 2011, Physica A;Takahashi et al., 2012, J Behav Econ & Finance). By adopting the q-exponential time and probability discounting models, our psychophysical and behavioral economic experiment confirmed that nonlinear distortion of psychophysical time is a common cause of the anomalies in decision both over time and under risk (i.e., intertemporal choice and decision under risk). Implications for psychophysical neuroeconomics and econophysics are discussed.

关键词： Psychophysics Discounting Neuroeconomics Econophysics Tsallis’ Statistics

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