A COMPARATIVE ANALYIS OF THE KOREAN BONUS - MALUS SYSTEM : TOUGH OF MILD ?

Lemaire, Jean,Jung, Ki Taig,Zi, Hong Min 한국보험학회 1996 保險學會誌 Vol.47 No.-

Multi-physics steady-state analysis of OECD/NEA modular high temperature gas-cooled reactor MHTGR-350

Lemaire, Matthieu,Lee, Hyunsuk,Tak, Nam-il,Lee, Hyun Chul,Lee, Deokjung Atomic Energy Society of Japan 2017 Journal of nuclear science and technology Vol.54 No.6

<P>This paper presents the application results of MCS/GAMMA+ to multi-physics analysis of OECD/NEA modular high temperature gas-cooled reactor (MHTGR) benchmark Phase I Exercise 3. It is a part of international R&D efforts lead by the Next Generation Nuclear Plant (NGNP) US project to improve the neutron-physics and thermal-fluid simulation of (high temperature gas-cooled reactors) HTGRs, one of the next generations of safer nuclear reactors. Accurate and validated analysis tools are indeed a crucial requirement for safety analysis and licensing of nuclear reactors. To guide this effort, a numerical benchmark on the MHTGR was created by the NGNP project and formally approved in 2012 for international participation by the OECD/NEA. The benchmark defines a common set of exercises and the comparison of solutions obtained with different analysis tools is expected to improve the understanding of simulation methods for HTGRs. The coupled neutronics/thermal-fluid solution presented in this paper was obtained with the neutron transport Monte Carlo code MCS developed by Ulsan National Institute of Science and Technology and the thermal-fluid code GAMMA+ developed by Korean Atomic Energy Research Institute. The purpose of this paper is to present the GAMMA+/MCS coupled system, the calculation methodology, and the obtained solutions.</P>

Verification of photon transport capability of UNIST Monte Carlo code MCS

Lemaire, Matthieu,Lee, Hyunsuk,Ebiwonjumi, Bamidele,Kong, Chidong,Kim, Wonkyeong,Jo, Yunki,Park, Jinsu,Lee, Deokjung Elsevier 2018 Computer physics communications Vol.231 No.-

<P><B>Abstract</B></P> <P>A photon transport capability has been implemented and verified in the Monte Carlo code MCS of Ulsan National Institute of Science and Technology for the purpose of radiation shielding studies. The MCS photon fixed-source mode simulates the transport of photons between 1 keV and 20 MeV for all elements from hydrogen to fermium. The specific physics for the main four photo-atomic reactions (Rayleigh scattering, Compton scattering, photoelectric effect and pair production) and three secondary processes of photon production (positron–electron annihilation, atomic relaxation and electron/positron bremsstrahlung) are reviewed. Verification results against Monte Carlo codes MCNP6.1 and SERPENT2.1.29 are presented. The verification cases include the comparison of energy distributions of photon flux in an infinite medium, of spatial distributions of photon flux in a cylinder, of the spatial distribution of photon body-equivalent dose in a spent nuclear fuel transport cask, and of photon KERMA (Kinetic Energy Released per MAss) in photon detector calibration geometries. Good calculation/calculation agreement is observed overall, with some marked differences in the detailed photon flux comparison at given energy ranges traced back to differences in photon physics implementation. MCS can from now on be applied for the purpose of advanced photon studies and corresponding validation against experimental shielding benchmarks will follow in the future.</P>

Dynamic Integration of Ubiquitous Robotic Systems through Capability Model Processing

Olivier Lemaire,Kohtaro Ohba,Shigeoki Hirais 제어로봇시스템학회 2006 제어로봇시스템학회 국제학술대회 논문집 Vol.2006 No.10

ISSUES IN BONUS -MALUS SYSTEMS DESIGN

( Jean Lemaire ) 한국리스크관리학회 2014 리스크 管理硏究 Vol.25 No.1

할인할증제도(bonus-malus system)는 대부분의 선진국에서 자동차책임보험보험요율체계의 기초적 요소로 사용된다. 이 논문에서는 할인할증제도의 역사와 발전과정에 대해 요약하고 한국의 상황과 같이 새로운 할인할증제도를 도입하거나 현재 제도를 수정하는 과정에서 고려해야 할 사항들을 세부적으로 설명하였다. 또한, 새로운 할인할증제도의 설계와 관련하여 저자의 풍부한 경험을바탕으로 보험회사와 규제당국에 권고사항을 제시하였다. In most developed countries, bonus-malus systems are a cornerstone of third-party liability automobile insurance rating. In this paper the history and evolution of such systems are summarized. The most common issues that arise when a country, like Korea, is in the process of implementing a new system or revising its current system, are then detailed. And recommendations for regulator and insurance companies are suggested.

Identification, Origin, and Evolution of Leaf Nodulating Symbionts of Sericanthe (Rubiaceae)

Benny Lemaire,Elmar Robbrecht,Braam van Wyk,Sandra Van Oevelen,Brecht Verstraete,Els Prinsen,Erik Smets,Steven Dessein 한국미생물학회 2011 The journal of microbiology Vol.49 No.6

Bacterial leaf symbiosis is an intimate association between bacteria and plants in which endosymbionts are housed within leaf nodules. This phenomenon has been reported in three genera of Rubiaceae (Pavetta, Psychotria, and Sericanthe), but the bacterial partner has only been identified in Psychotria and Pavetta. Here we report the identification of symbiotic bacteria in two leaf nodulating Sericanthe species. Using 16S rRNA data and common housekeeping genetic markers (recA and gyrB) we studied the phylogenetic relationships of bacterial endosymbionts in Rubiaceae. Endosymbionts of leaf nodulating Rubiaceae were found to be closely related and were placed as a monophyletic group within the genus Burkholderia (β-Proteobacteria). The phylogenetic analyses revealed a pattern of strict host specificity and placed the two investigated endosymbionts at two distinct positions in the topology of the tree, suggesting at least two different evolutionary origins. The degree of sequence divergence between the Sericanthe endosymbionts and their relatives was large enough to propose the Sericanthe endosymbionts as new species (‘Candidatus Burkholderia andongensis’ and ‘Candidatus Burkholderia petitii’). In a second part of this study, the pylogenetic relationships among nodulating and non-nodulating Sericanthe species were investigated using sequence data from six chloroplast regions (rps16, trnG, trnL-trnF, petD, petA-psbJ, and atpI-atpH). Overall, genetic variation among the plastid markers was insufficient to enable phylogenetic estimation. However, our results could not rule out the possibility that bacterial leaf symbiosis originated once in a common ancestor of the Sericanthe species.

Analysis of VVER-1000 mock-up criticality experiments with nuclear data library ENDF/B-VIII.0 and Monte Carlo code MCS

Setiawan, Fathurrahman,Lemaire, Matthieu,Lee, Deokjung Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.1

The criticality analysis of VVER-1000 mock-up benchmark experiments from the LR-0 research reactor operated by the Research Center Rez in the Czech Republic has been conducted with the MCS Monte Carlo code developed at the Computational Reactor Physics and Experiment laboratory of the Ulsan National Institute of Science and Technology. The main purpose of this work is to evaluate the newest ENDF/B-VIII.0 nuclear data library against the VVER-1000 mock-up integral experiments and to validate the criticality analysis capability of MCS for light water reactors with hexagonal fuel lattices. A preliminary code/code comparison between MCS and MCNP6 is first conducted to verify the suitability of MCS for the benchmark interpretation, then the validation against experimental data is performed with both ENDF/B-VII.1 and ENDF/B-VIII.0 libraries. The investigated experimental data comprises six experimental critical configurations and four experimental pin-by-pin power maps. The MCS and MCNP6 inputs used for the criticality analysis of the VVER-1000 mock-up are available as supplementary material of this article.

CAROD: Computer-Aided Reliable and Optimal Design as a concurrent system for real structures

Kharmanda, Ghias,Mohamed, Alaa,Lemaire, Maurice Society for Computational Design and Engineering 2002 International Journal of CAD/CAM Vol.2 No.1

Computer-Aided Reliable and Optimal Design (CAROD) system is an efficient tool defining the best compromise between cost and safety. Using the concurrent engineering concept, it can supply the designer with all numerical information in the design process. This system integrates several fields such as multidisciplinary optimization, reliability analysis, finite element analysis, geometrical modeling, sensitivity analysis and concurrent engineering. When integrating these disciplines, many difficulties are found such as model coupling and computational time. In this paper, we propose a new concurrent methodology satisfying the reliability requirement, allowing the coupling of different models and reducing the computational time. Two applications (rotating disk and hook structures) demonstrate that CAROD system can be a practical concurrent engineering application for designers.

Fuel performance analysis of BEAVRS benchmark Cycle 1 depletion with MCS/FRAPCON coupled system

Yu, Jiankai,Lee, Hyunsuk,Lemaire, Matthieu,Kim, Hanjoo,Zhang, Peng,Lee, Deokjung Elsevier 2020 Annals of nuclear energy Vol.138 No.-

<P><B>Abstract</B></P> <P>A fuel performance (FP) analysis of the BEAVRS (Benchmark for Evaluation and Validation of Reactor Simulations) benchmark Cycle 1 depletion is performed using the MCS/FRAPCON coupled code system. MCS/FRAPCON is a cycle-wise Picard-iteration inner-coupling code system. It is based on the Monte Carlo neutron-transport code MCS and employs the steady-state fuel behavior prediction code FRAPCON as a thermal-hydraulic (T/H) and FP solver. MCS is developed by the Computational Reactor Physics and Experiment Lab of Ulsan National Institute of Science and Technology for the high-fidelity full-core analysis of large-scale commercial light water reactors. Results of power, fuel temperature, coolant temperature and coolant density distributions are presented and analyzed for a quarter-core pin-wise depletion simulation of the BEAVRS Cycle 1 benchmark with T/H and FP feedback (10 axial meshes per pin, 180,870 depletion cells in total). For code-code comparison purpose, the depletion simulation is also conducted with the MCS/TH1D (internal one-dimensional T/H solver) and MCS/CTF (external sub-channel 3D T/H solver) coupled code systems. The dependence to the burnup of the power, fuel temperature, coolant temperature, and coolant density distributions is analyzed by comparison between the three coupled systems. Validation is performed against BEAVRS measured data for the calculated boron letdown curve and calculated distributions of axially-integrated assembly-wise detector signal. Finally, unique distributions of parameters that can only be obtained by FP analysis are examined to illustrate the advanced analysis capability of MCS/FRAPCON.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Development of neutronic Monte Carlo/fuel performance coupled code system MCS/FRAPCON. </LI> <LI> Application of MCS/FRAPCON for the fuel performance analysis of BEAVRS benchmark Cycle 1 depletion. </LI> <LI> Validation of MCS/FRAPCON simulation results against BEAVRS measured data. </LI> <LI> Comparison and discussion of simulation results between MCS/FRAPCON and MCS/TH1D, MCS/CTF. </LI> </UL> </P>

Electro-osmotic pump in osteo-articular tissue engineering: A feasibility study

Lemonnier, Sarah,Naili, Salah,Lemaire, Thibault Techno-Press 2014 Advances in biomechanics & applications Vol.1 No.4

The in vitro construction of osteo-articular large implants combining biomaterials and cells is of great interest since these tissues have limited regeneration capability. But the development of such organoids is particularly challenging, especially in the later time of the culture, when the extracellular matrix has almost filled the initial porous network. The fluid flow needed to efficiently perfuse the sample can then not be achieved using only the hydraulic driving force. In this paper, we investigate the interest of using an electric field to promote mass transport through the scaffold at the late stage of the culture. Based on the resolution of the electrokinetics equations, this study provides an estimation of the necessary electric driving force to reach a sufficient oxygen perfusion through the sample, thus analyzing the feasibility of this concept. The possible consequences of such electric fields on cellular activities are then discussed.