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Erwan Renaudin,Ayman Habib,Ana Paula Kersting 한국전자통신연구원 2011 ETRI Journal Vol.33 No.4
Currently, there is a considerable interest in 3D object reconstruction using terrestrial laser scanner (TLS) systems due to their ability to automatically generate a considerable amount of points in a very short time. To fully map an object, multiple scans are captured. The different scans need to be registered with the help of the point cloud in the overlap regions. To guarantee reliable registration, the scans should have large overlap ratio with good geometry for the estimation of the transformation parameters among these scans. The objective of this paper is to propose a registration method that relaxes/eliminates the overlap requirement through the utilization of photogrammetrically reconstructed features. More specifically, a point-based procedure, which utilizes non-conjugate points along corresponding linear features from photogrammetric and TLS data, will be used for the registration. The non-correspondence of the selected points along the linear features is compensated for by artificially modifying their weight matrices. The paper presents experimental results from simulated and real datasets to illustrate the feasibility of the proposed procedure.
Erwan, E.,Alimon, A.R.,Sazili, A.Q.,Yaakub, H.,Karim, R. Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.5
An experiment involving 180 straight run one-day-Cobb broilers was conducted to evaluate the effect of supplementation of L-leucine with different levels of crude protein (CP) on carcass composition and sensory characteristics of broiler grower-finisher chickens. Six experimental diets comprising two levels of crude protein (CP) i.e., 20 and 20% with three levels of L-leucine i.e. 0, 0.5 and 0.67%, were offered to birds from 21-42 d of age. The birds were randomly divided into 36 experimental pens, 5 chickens in each pen, and there were 6 replicates under each diet. L-leucine supplementation did not affect the bone and lean, whereas fat was decreased (p<0.05) when L-leucine was added at 0.5%. Similarly, there were no significant differences (p>0.05) in the lean, fat and bone among chickens fed two levels of CP. No significant differences between dietary treatments were observed on any sensory characteristics affected by dietary L-leucine and CP. From this study, it is obvious that supplementation of up to 0.5% L-leucine reduced fat. However, other characteristics were not affected by supplementation of L-leucine. Similarly, reduction of body composition and sensory characteristics were not apparent on a diet low in CP.
Roy, Erwan Le,Cho, Eun Ae,Kim, Heesan,Kwon, HyukSang 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.6
The influences of Mo on the structure and semiconducting properties of the passive films formed on 18Cr-8Ni stainless steels (SSs) have been examined by photo-electrochemical spectroscopy (PES) and atomic force microscopy (AFM). The photocurrent spectra for the passive films formed on 18Cr-8Ni and I8Cr-8Ni-4Mo SSs could be resolved into two component spectra, each of which was generated respectively by the d-d and the p-d electronic transitions occurring in the outer iron rich layer consisting of γ-Fe₂O₃ containing Cr^(3+), and exhibiting n-type semiconducting behavior. The first photocurrent component associated with the d-d transition exhibited a band gap energy (E_g) of 3.0 eV with a photocurrent peak at 3.9 eV irrespective of the Mo addition, whereas the second one associated with the p-d transition showed E_g, between 2.9 and 3.2 eV with a photocurrent peak at 4.2-4.5 eV. The addition of 4Mo to 18Cr-8Ni SS shifted the photocurrent peak of the second component fiom 4.2 to 4.5 eV, resulting from the Mo-induced Cr-enrichment in the passive film. Further, Mo alloyed with 18Cr-8Ni SS made the passive film structurally more amorphous and chemically more homogeneous when compared in terms of the disorder energy based on the Dunstan theory and the AFM topography on the passive films of on the two alloys.
Mahyuzie Jenal,Erwan Sulaiman,Rajesh Kumar 한국자기학회 2016 Journal of Magnetics Vol.21 No.4
Currently, an interest in electric vehicles (EVs) exhibited by automakers, government agencies and customers make it as more attractive research. This is due to carbon dioxide emitted by conventional combustion engine that worsens the greenhouse effect nowadays. Since electric motors are the core of EVs, it is a pressing need for researchers to develop advanced electric motors. As one of the candidates, switched flux machine (SFM) is initiated in order to cope with the requirement. This paper proposes a new alternate circumferential and radial flux (AlCiRaF) of permanent magnet switched flux machines (PMSFM) for light weight electric vehicles. Firstly, AlCiRaF PMSFM is compared with the conventional PMSFM based on some design restrictions and specifications. Then the design refinements techniques are conducted by using deterministic optimization method in order to improve preliminary performance of machine. Finally the optimized machine design has achieved maximum torque and power of 47.43 Nm and 12.85 kW, respectively, slightly better than that of conventional PMSFM.
연성모,Auburtin Erwan,Shen Zhirong,Loubeyre Sebastien,Lee Byung Hyuk,Seo Min-Guk,Sileo Lucia,Kim Hyun Joe 대한조선학회 2022 International Journal of Naval Architecture and Oc Vol.14 No.1
Mean wind load on a semi-submersible rig and an FPSO was investigated by using Computational Fluid Dynamics (CFD) for the modeling practice developed in Reproducible Offshore CFD JIP. The modeling practice is benchmarked against available model test results for a semi-submersible rig and an FPSO in blind manner between verifiers. For the semi-submersible rig, an even keel and four inclined conditions were considered. The uncertainty levels between verifiers’ results were within 10%. Slightly larger scatter was observed in inclined conditions but did not show any larger than 10% uncertainty level. It was possible to reduce the discrepancy by easing the setting difference from the wind tunnel test by introducing gap around deckbox and columns. For the FPSO, the results were within 3% for forces and within 14% for moments. After considering model test setup including the gap between FPSO hull bottom and turntable, the results were improved and within 10% error between the results and wind tunnel test except for 120 and 240 headings.
Rajesh Kumar,Erwan Sulaiman,Mahyuzie Jenal,Fatiah Shafiqah Bahrim 한국자기학회 2017 Journal of Magnetics Vol.22 No.1
To empower safe, economical and eco-friendly sustainable solution for enhancing oil and gas productivity from deep water reservoirs, new downhole technologies are recommended. Since electric machine plays leading role in the downhole application, it is a squeezing requirement for researchers to design and develop advanced electric machine. The Recent improvement in technology and uses of high-temperature magnets, permanent magnet flux switching machine (PMFSM) has become one of the appropriate contenders for offshore drilling but fewer designed for downhole due to ambient temperature. Therefore this comprehensive study deals with the design optimization and performance analysis of outer rotor PMFSM for the downhole application. Preliminary, the basic design parameters needed for machine design are calculated mathematically. Then the design refinement technique is implemented through deterministic method. Finally, initial and optimized performance of the machine is compared and as a result the output torque is increase from 16.39 Nm to 33.57 Nm while diminishing the cogging torque and PM weight up to 1.77 Nm and 0.79 kg, respectively. Therefore, it is concluded that purposed optimized design is suitable for the downhole application.
Hélène Caillon,Cécile Tardif,Erwan Dumontet,Norbert Winer,Damien Masson 대한진단검사의학회 2018 Annals of Laboratory Medicine Vol.38 No.2
Background: Management of pregnant women at high risk of pre-eclampsia (PE) requires frequent monitoring, with referral to specialized perinatal care centers. Reliable tests are necessary to improve prediction of PE and related complications and to assess disease severity and progression. An imbalance in two biomarkers, soluble fms-like tyrosine kinase 1 (sFlt-1) and placental growth factor (PlGF), is involved in PE pathogenesis. The sFlt-1 to PlGF ratio is increased in pregnant women before the onset of PE. An elevated ratio is highly predictive of PE, whereas the diagnosis of PE can be ruled out within one week for low ratios. The main objective of this study was to assess whether a low sFlt-1/PlGF ratio, below a cutoff of 38, can predict the absence of PE within one week.
Mohd Fairoz Omar,Erwan Sulaiman,Md. Zaraf Ahmad 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.6
Three-phase feld excitation fux switching motor (FEFSM) with salient rotor structure has been introduced with their advantages of rotor easy temperature elimination and controllable FEC magnetic fux. Yet, the salient rotor structure is found to lead a longer magnetic fux path between stator and rotor parts, producing a weak fux linkage along with low torque performances. Hence, a new structure of single-phase FEFSM using segmental rotor with non-overlap windings is proposed with advantages of shorter magnetic fux path, light weight and robust rotor structure. Analysis on fundamental magnetic fux characteristics, armature and FEC magnetic fux linkages, cogging torque, back-Emf, various torque capabilities, refnement of unbalance magnetic fux, and torque-power versus speed characteristics are conducted using 2D FEA through JMAG Designer version 15. The results show that magnetic fux amplitude ratio has been improved by 41.2% while the highest torque and power achieved are 1.45 Nm and 343.8 W, respectively.
Soomro Irfan Ali,Sulaiman Erwan Bin,Ahmad Md Zarafi Bin,Aziz Roziah 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4
Due to the large power/torque density and high efficiency of permanent magnet flux switching magnet (FSPM) are suitable for driving electric vehicles and hybrid electric vehicles. In this paper, flux switching permanent magnet machine (PMFSM), field excitation flux switching machine (FEFSM) and hybrid excitation flux switching machine (HEFSM) with salient rotor topology is compared with modular rotor permanent magnet flux switching machine. On the condition of the same outer diameters, the electromagnetic performances of the machines are analyzed and compared by the two-dimensional (2D) finite element method including the flux density, back electromotive force (EMF), cogging torque, electromagnetic torque, and power. The finite element results show that the modular rotor permanent magnet flux switching machine has greater torque than salient rotor FEFSM, HEFSM, and PMFSM at the rated load with significantly less weight than the others.