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Frontiers of Computer Science 2017年第6期11卷 1098-1108页

作者： Lip yee POR Chin soon KU Amanul ISLAM Tan Fong ANG Department of Computer Science and Information Technology University of Malaya Kuala Lumpur 50603 Malaysia Department of Computer Science Universiti Tunku Abdul Rahman (Jalan Universiti) Kampar 31900 Malaysia

In this paper, a new scheme that uses digraph substitution rules to conceal the mechanism or activity re- quired to derive password-images is proposed. In the pro- posed method, a user is only required to click on one of the pass-image instead of both pass-images shown in each chal- lenge set for three consecutive sets. While this activity is sim- ple enough to reduce login time, the images clicked appear to be random and can only be obtained with complete knowl- edge of the registered password along with the activity rules. Thus, it becomes impossible for shoulder-surfing attackers to obtain the information about which password images and pass-images are used by the user. Although the attackers may know about the digraph substitution rules used in the pro- posed method, the scenario information used in each chal- lenge set remains. User study results reveal an average login process of less than half a minute. In addition, the proposed method is resistant to shoulder-surfing attacks.

关键词： graphical password authentication shoulder-surfing data and computer security digraph substitution rules

Automatic analysis of deep-water remotely operated vehicle footage for estimation of Norway lobster abundance

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Frontiers of Information Technology & Electronic Engineering 2018年第8期19卷 1042-1055页

作者： Ching soon TAN Phooi yee LAU Paulo L.CORREIA Aida CAMPOS Centre for Computing and Intelligent Systems Universiti Tunku Abdul RahmanKampar 31900Malaysia lnstituto de Telecomunicaqoes Instituto Superior TecnicoAv.Rovisco Pais1Lisbon 1049-001Portugal Instituto Portugues do Mar e da Atmosfera(IPMA) Divisao de Modelacao e Gestao de Recursos da PescaLisbon 1749-077Portugal Centro de Ciencias do Mar(CCMAR)-Campus de Gambelas Faro 8005-139Portugal

Underwater imaging is being used increasingly by marine biologists as a means to assess the abundance of marine resources and their biodiversity. Previously, we developed the first automatic approach for estimating the abundance of Norway lobsters and counting their burrows in video sequences captured using a monochrome camera mounted on trawling gear. In this paper, an alternative framework is proposed and tested using deep-water video sequences acquired via a remotely operated vehicle. The proposed framework consists of four modules:(1) preprocessing,(2) object detection and classification,(3) object-tracking, and(4) quantification. Encouraging results were obtained from available test videos for the automatic video-based abundance estimation in comparison with manual counts by human experts(ground truth). For the available test set, the proposed system achieved 100%precision and recall for lobster counting, and around 83% precision and recall for burrow detection.

关键词： Object detection Object tracking Feature extraction Remotely operated vehicle(ROV)

Intrinsic hard magnetism and thermal stability of a ThMn_(12)-type permanent magnet

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npj Computational Materials 2022年第1期8卷 1829-1838页

作者： Tumentsereg Ochirkhuyag soon Cheol hong Dorj Odkhuu Department of Physics Incheon National UniversityIncheon22012South Korea Department of Physics University of UlsanUlsan44610South Korea

Herein,we theoretically demonstrate that simple metal(Ga and Al)substitutional atoms,rather than the conventional transition metal substitutional elements,not only stabilize the ThMn_(12)-type SmFe_(12) and Sm(Fe,Co)_(12)phases thermodynamically but also further improve their intrinsic magnetic properties such that they are superior to those of the widely investigated SmFe_(11)Ti and Sm(Fe,Co)_(11)Ti magnets,and even to the state-of-the-art permanent magnet Nd_(2)Fe_(14)*** specifically,the quaternary Sm(Fe,Co,Al)_(12)phase has the highest uniaxial magnetocrystalline anisotropy(MCA)of about 8 MJ m^(−3),anisotropy field of 18.2 T,and hardness parameter of 2.8 at room temperature and a Curie temperature of 764 ***,the Al and Ga substitutional atoms improve the single-domain size of the Sm(Fe,Co)_(12)grains by nearly a factor of *** results of MCA and MCA-driven hard magnetic properties can be described by the strong spin-orbit coupling and orbital angular momentum of the Sm 4f-electron orbitals.

关键词： permanent anisotropy stability

Superior mechanical properties and strengthening mechanisms of lightweight AlxCrNbVMo refractory high-entropy alloys(x=0,0.5,1.0)fabricated by the powder metallurgy process

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Journal of Materials Science & Technology 2021年第10期69卷 32-41页

作者： Byungchul Kang Taeyeong Kong Ho Jin Ryu soon Hyung hong Department of Material Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea

Light and strong AlxCrNbVMo(x=0,0.5,and 1.0)refractory high-entropy alloys(RHEAs)were designed and fabricated via a the powder metallurgical *** microstructure of the AlxCrNbVMo alloys consisted of a single BCC crystalline structure with a sub-micron grain size of 2-3μm,and small amounts(<4 vol.%)of fine oxide *** homogeneous microstructure,without chemical segregation or micropores was achieved via high-energy ball milling and spark-plasma *** alloys exhibited superior mechanical properties at 25 and 1000℃compared to those of other ***,CrNbVMo alloy showed a yield strength of 2743 MPa at room ***,the yield strength of the CrNbVMo alloy at 1000℃was 1513 *** specific yield strength of the CrNbVMo alloy was increased by 27%and 87%at 25 and 1000℃,respectively,compared to the AlMo_(0.5) NbTa_(0.5)TiZr RHEA,which exhibited so far the highest specific yield strength among the cast *** addition of Al to CrNbVMo alloy was advantageous in reducing its reduce density to below 8.0 g/cm^(3),while the elastic modulus decreased due to the much lower elastic modulus of Al compared to that of the CrNbVMo *** analysis of the strengthening contributions,showed that the solid solution strengthening,arising from a large misfit effect due to the size and modulus,and the high shear modulus of matrix,was revealed to predominant strengthening mechanism,accounting for over 50%of the yield strength of the AlxCrNbVMo RHEAs.

关键词： High-entropy alloy Powder metallurgy Refractory Strengthening mechanisms Oxide dispersoids

Global parameter estimation of the Cochlodinium polykrikoides model using bioassay data

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Acta Oceanologica Sinica 2016年第2期35卷 39-45页

作者： CHO hong-Yeon PARK Kwang-soon KIM Sung Coastal and Environmental Engineering Division Korea Institute of Ocean Science and Technology Coastal Disaster Research Center Korea Institute of Ocean Science and Technology Biological Oceanography and Marine Biology Division Korea Institute of Ocean Science and Technology

Cochlodinium polykrikoides is a notoriously harmful algal species that inflicts severe damage on the aquacultures of the coastal seas of Korea and Japan. Information on their expected movement tracks and boundaries of influence is very useful and important for the effective establishment of a reduction plan. In general, the information is supported by a red-tide（a.k.a algal bloom） model. The performance of the model is highly dependent on the accuracy of parameters, which are the coefficients of functions approximating the biological growth and loss patterns of the C. polykrikoides. These parameters have been estimated using the bioassay data composed of growth-limiting factor and net growth rate value pairs. In the case of the C. polykrikoides, the parameters are different from each other in accordance with the used data because the bioassay data are sufficient compared to the other algal species. The parameters estimated by one specific dataset can be viewed as locally-optimized because they are adjusted only by that dataset. In cases where the other one data set is used, the estimation error might be considerable. In this study, the parameters are estimated by all available data sets without the use of only one specific data set and thus can be considered globally optimized. The cost function for the optimization is defined as the integrated mean squared estimation error, i.e., the difference between the values of the experimental and estimated rates. Based on quantitative error analysis, the root-mean squared errors of the global parameters show smaller values, approximately 25%–50%, than the values of the local parameters. In addition, bias is removed completely in the case of the globally estimated parameters. The parameter sets can be used as the reference default values of a red-tide model because they are optimal and representative. However, additional tuning of the parameters using the in-situ monitoring data is highly *** opposed to the bioassay d

关键词： global and local estimation gain and loss parameters Cochlodinium polykrikoides bioassay data model performance

Short-term traffic forecasting model: prevailing trendsand guidelines

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Transportation Safety and Environment 2023年第3期5卷 1-19页

作者： Kian Lun soon Robin Kuok Cheong Chan Joanne Mun-yee Lim Rajendran Parthiban School of Engineering Monash UniversityMalaysiaBandar Sunday 47500Malaysia

The design parameters serve as an integral part of developing a robust short-term traffc forecasting model These parameters include scope determination,input data preparation,output parameters and modelling *** paper takes a further leap to analyse the recent trend of design parameters through a systematic literature review based on peer-reviewed articles up to *** key important findings are summarized along with the challenges of performning short-term traffic ***,this paper offers insights into the next wave of research that contributes significantly to industries.

关键词： design parameters transport and society short term forecasting systematic literature review

Tidal effects based on a GUP-induced effective metric

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Communications in Theoretical Physics 2024年第9期76卷 63-72页

作者： soon-Tae hong Yong-Wan Kim Young-Jai Park Center for Quantum Spacetime and Department of Physics Sogang UniversitySeoul 04107Republic of Korea Department of Physics and Research Institute of Physics and Chemistry Jeonbuk National UniversityJeonju 54896Republic of Korea Department of Physics Sogang UniversitySeoul 04107Republic of Korea

In this paper,we study tidal forces in the Schwarzschild black hole,whose metric explicitly includes a generalized uncertainty principle(GUP)*** also investigate interesting features of the geodesic equations and tidal effects that are dependent on the GUP parameterαrelated to a minimum ***,by solving the geodesic deviation equations explicitly with appropriate boundary conditions,we show thatαin the effective metric affects both the radial and angular components of the geodesic equation,particularly near the singularities.

关键词： generalized uncertainty principle geodesic deviation equation effective metric

Adenosine monophosphate enhances callus regeneration competence for de novo plant organogenesis

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Molecular Plant 2023年第12期16卷 1867-1870页

作者： hong Gil Lee Seo Young Jang Eun yee Jie Seung Hee Choi Ok-Sun Park soon Hyung Bae Hyun-soon Kim Suk Weon Kim Geum-Sook Hwang Pil Joon Seo Department of Chemistry Seoul National UniversitySeoul 08826Korea Plant Genomics and Breeding Institute Seoul National UniversitySeoul 08826Korea Integrated Metabolomics Research Group Western Seoul CenterKorea Basic Science InstituteSeoul 03759Korea Biological Resource Center Korea Research Institute of Bioscience and BiotechnologyJeongeup56212Korea Plant Systems Engineering Research Center Korea Research Institute of Bioscience and BiotechnologyDaejeon 34141Korea College of Pharmacy Chung-Ang UniversitySeoul 06974Korea

Dear Editor,Plant tissue culture involves callus formation and de novo shoot ***,explants from differentiated tissues are used to generate a pluripotent cell mass,called callus,on auxin-rich callus-inducing medium(CIM),followed by shoot regeneration on cytokinin-rich shoot-inducing medium(SiM).Callus results from division of pericycle-like cells(Atta et al.,2009;Sugimoto et al.,2010);its cellular identity resembles that of lateral root primordia(Atta et al.,2009;Sugimoto et al.,2010).Callus acquires cellular pluripotency by forming root stem cell niches on CIM(Sugimoto et al.,2010)。

关键词： Adenosine callus

Study on SCR De NO_x mechanism through in situ electrical conductivity measurements on V_2O_5-WO_3/TiO_2 catalysts

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Rare Metals 2006年第Z2期25卷 77-83页

作者： HA Heon Phil JUNG soon Hyo LEE Jun Yub hong Sung Ho Metal Processing Research Center Korea Institute of Science and Technology Cheongryang Seoul 130-650 Republic of Korea Power Engineering Research Institute Korea Power Engineering Company Inc. 360-9 Mabuk-ri Guseong-eup Yongin-si Gyeonggi-do 449-713 Republic of Korea

V2O5-WO3/TiO2 catalysts were prepared by impregnation method and in situ electrical conductivity measurements were carried out to investigate the reaction mechanism for ammonia SCR (selective catalytic reduction) of NOx. The electrical conductivity change with ammonia supply and the increase of electrical conductivity were mainly caused by reduction of the labile surface oxygen. The electrical conductivity change of catalysts shows close relationship with the conversion rate of NOx. Variation of conversion rate in atmosphere without gaseous oxygen also supports that the labile lattice oxygen is indispensable in the initial stage of the de NOx reaction. These results suggest that the liable lattice oxygen acts decisive role in the de NOx mechanism. They also support that De NOx reaction occurs through the Eley-Rideal type mechanism. The amount of labile oxygen can be estimated from the measurement of electrical conductivity change for catalysts with ammonia supply.

关键词： De NOx selective catalytic reduction electrical conductivity lattice oxygen