• Title/Summary/Keyword: scale-up technology

Search Result 823, Processing Time 0.036 seconds

Scaleup of Electrolytic Reactors in Pyroprocessing (Pyroprocessing 공정에 사용되는 전해반응장치의 규모 확대)

  • Yoo, Jae-Hyung;Kim, Jeong-Guk;Lee, Han-Soo
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
    • /
    • v.7 no.4
    • /
    • pp.237-242
    • /
    • 2009
  • In the pyroprocessing of spent nuclear fuels, fuel materials are recovered by electrochemical reactions on the surface of electrodes as well as stirring the electrolyte in electrolytic cells such as electrorefiner, electroreducer and electrowinner. The system with this equipment should first be scaled-up in order to commercialize the pyroprocessing. So in this study, the scale-up for those electrolytic cells was studied to design a large-scale system which can be employed in a commercial process in the future. Basically the dimensions of both electrolytic cells and electrodes should be enlarged on the basis of the geometrical similarity. Then the criterion of constant power input per unit volume, characterizing the fluid behavior in the cells, was introduced in this study and a calculation process based on trial-and-error methode was derived, which makes it possible to seek a proper speed of agitation in the electrolytic cells. Consequently examples of scale-up for an arbitrary small scale system were shown when the criterion of constant power input per unit volume and another criterion of constant impeller tip speed were respectively applied.

  • PDF

Component structural analysis on 15kW class wave energy converter

  • Singh, Patrick Mark;Chen, Zhenmu;Choi, Young-Do
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.39 no.8
    • /
    • pp.821-827
    • /
    • 2015
  • This study concentrates on a wave energy converter with floaters that extracts the ocean's energy by moving up and down with the wave motion. The floater is connected to an arm structure, including a hydraulic cylinder that drives a hydraulic generator. This study focuses on a structural analysis of the floater unit, including arm and cylinder components, platform and jack-up system, along with spud columns. Previous studies have been conducted for miniature models for experimentation, but this study focuses on the full-scale model structural analysis. Static structural analysis is conducted using fine numerical grids. Due to the complexity of the whole model, it is analyzed in separate pieces. The floater unit, with arm and cylinder, are combined into one system. The platform is analyzed separately as a single system. There are four jack-up systems for each spud column; only one jack-up system is analyzed, as uniform loads are assumed on each system. There are several load cases for each system, all of which are analyzed thoroughly for stress (von Mises, shear, and normal) and deformation. Acceptable results were obtained for most of the components; unsafe components were redesigned.

Development of Information Model based Integrated Management and Monitoring System for Naval Ship Combat System with Heterogeneous Distributed Environments (이기종 분산 환경의 함정전투체계를 위한 정보 모델 기반 통합 관리 및 모니터링 시스템 개발)

  • Min, Bup-Ki;Kim, Hyeon-Soo;Kuk, Seung-Hak;Kim, Chum-Su;Han, Woong-Gie
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.15 no.4
    • /
    • pp.381-389
    • /
    • 2012
  • In the existing naval combat system, integrated management is done based on subsystems that make up the system. The naval combat system, however, is a large-scale distributed system made up of subsystems of diverse heterogeneous environments. Although each of the subsystems can be easily managed because they are on the same platform, it is extremely difficult to integrate and manage as a single entity all subsystems that make up the naval combat system because the heterogeneous environments and distributed systems have to be taken into account. In fact, there hasn't been a technique available to integrate and manage subsystems that make up the naval combat system, until now. In this paper, the architecture of an integrated management system is designed and implemented to provide the user with various services. Furthermore, a system that can manage subsystems of the naval combat system in an integrated way is developed.

AutoScale: Adaptive QoS-Aware Container-based Cloud Applications Scheduling Framework

  • Sun, Yao;Meng, Lun;Song, Yunkui
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.13 no.6
    • /
    • pp.2824-2837
    • /
    • 2019
  • Container technologies are widely used in infrastructures to deploy and manage applications in cloud computing environment. As containers are light-weight software, the cluster of cloud applications can easily scale up or down to provide Internet-based services. Container-based applications can well deal with fluctuate workloads by dynamically adjusting physical resources. Current works of scheduling applications often construct applications' performance models with collected historical training data, but these works with static models cannot self-adjust physical resources to meet the dynamic requirements of cloud computing. Thus, we propose a self-adaptive automatic container scheduling framework AutoScale for cloud applications, which uses a feedback-based approach to adjust physical resources by extending, contracting and migrating containers. First, a queue-based performance model for cloud applications is proposed to correlate performance and workloads. Second, a fuzzy Kalman filter is used to adjust the performance model's parameters to accurately predict applications' response time. Third, extension, contraction and migration strategies based on predicted response time are designed to schedule containers at runtime. Furthermore, we have implemented a framework AutoScale with container scheduling strategies. By comparing with current approaches in an experiment environment deployed with typical applications, we observe that AutoScale has advantages in predicting response time, and scheduling containers to guarantee that response time keeps stable in fluctuant workloads.

Scale-up Fabrication of Flat Sheet Membrane by Using a Roll-to-Roll Process (롤투롤 공정을 활용한 평판형 분리막의 대면적 제조 연구)

  • Dong Hyeok Baek;Youngmin Yoo;In-Chul Kim;You-In Park;Seung-Eun Nam;Young Hoon Cho
    • Membrane Journal
    • /
    • v.34 no.1
    • /
    • pp.79-86
    • /
    • 2024
  • The flat sheet membrane, one of the representative forms of polymeric membranes, is widely used from material research in laboratories to commercial membrane production due to its ease of fabrication. Porous polymeric flat sheet membranes used in microfiltration and ultrafiltration are mainly fabricated through phase separation processes, utilizing non-solvent-induced and vapor-induced phase separation methods. However, due to the nature of phase separation processes, variations between samples can easily occur depending on the surrounding environment and the experimenter, making it difficult to ensure reproducibility. Therefore, for scaling up and ensuring reproducibility of developed membrane fabrication technologies, there is a need for a controlled environment continuous large-area production device, such as a roll-to-roll manufacturing system. This research compared the changes in membrane characteristics due to differences in manufacturing environments when scaling up laboratory-scale fabrication technologies to roll-to-roll processes using knife and slot die coaters. By optimizing the continuous manufacturing process factors, uniformity of the membrane was ensured during large-area production.

Development of Construction Simulation Apparatus on Centrifugal Experiment (원심모형실험을 위한 시공단계모사장비개발)

  • Kim, You-Seok;Kim, Kyoung-O;Lee, Jong-Pil;Park, Jin-Woo
    • Proceedings of the Korean Geotechical Society Conference
    • /
    • 2010.09a
    • /
    • pp.979-990
    • /
    • 2010
  • Although a centrifuge model test is performed with scaled models, it has a lot of advantages compared with usual scale model tests, for the reproduction of stress levels equal to a full scale test is possible. At the beginning of the Daewoo Institute of Construction Technology, a servo-motor-driven single axis actuator was introduced and has been in use with a geo-centrifuge. However, for variety of experiments and construction stage simulation, various apparatuses have been developed, such as a vacuum generator, a lateral actuator for tidal power simulation, a gravel hopper and a sand drainer for filled-up ground, and a water level controller. The apparatuses have been manufactured with enough strength and durability to be operated under specific g levels. This paper presents the properties of the apparatuses and the results of the tests performed with those.

  • PDF

Synthesis of spherical SiO2 using scaled-up ultrasonic pyrolysis process (스케일-업 된 초음파 분무 열분해 공정을 이용한 구형 SiO2 분말 합성)

  • Kang, Woo-kyu;Lee, Ji-Hyeon;Kim, Jin-Ho;Hwang, Kwang-Taek;Jang, Gun-Eik
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.29 no.1
    • /
    • pp.12-18
    • /
    • 2019
  • The spherical $SiO_2$ powders were synthesized by the scaled-up ultrasonic pyrolysis (USP). The aqueous $SiO_2$ sol, which contained 20~30 nm $SiO_2$ particles, was used as a precursor for the scaled-up USP. The effects of the USP operating conditions and precursor conditions were systematically investigated, including reaction temperature, gas flow rate, and the concentration of $SiO_2$ sol on the morphologies of synthesized $SiO_2$ particles. the synthesized $SiO_2$ particle showed a pseudo-crystal phase, spherical morphology, and a smooth surface. The size of the spherical $SiO_2$ particle decreased as both reaction temperature increased and precursor concentration decreased. In addition, the synthesized $SiO_2$ particle size was increased by increasing the gas flow rate. Lastly, the scaled-up USP was compared with the lab-scale USP based on the same process conditions. Due to a short retention time in the reaction tube during the USP process, the $SiO_2$ particle synthesized via the lab-scale USP showed a larger particle size.

Nano-scale Information Materials Using Organic/Inorganic Templates (유기/무기 나노 템플레이트를 이용한 나노 정보소재 합성 연구)

  • Lee, Jeon-Kook;Jeung, Won-Young
    • Journal of the Korean Magnetics Society
    • /
    • v.14 no.4
    • /
    • pp.149-161
    • /
    • 2004
  • The fusion of nano technology and information technology is essential to sustain the present growth rate and to induce new industry in this ever-growing information age. Considering Korean industry whose competitiveness lies heavily on information related technologies, this field will be inevitable for future. Nano materials can be described as novel materials whose size of elemental structure has been engineered at the nanometer scale. Materials in the nanometer size range exhibit fundamentally new behavior, as their size falls below the critical length scale associated with any given property. " Bottom-up' techniques involve manipulating individual atoms and molecules. Bottom-up process usually implies controlled or directed self assembly of atoms and molecules into nano structures. It resembles more closely the processes of biology and chemistry, where atoms and molecules come together to create structures such as crystals or living cells. Nano scale sensors are included in the electronics area since the diverse sensing mechanisms are often housed on a semiconductor substrate and usually give rise to an electronic signal. The application of nano technology to the chemical sensors should allow improvements in functionality such as gas sensing. In this presentation, we will discuss about the nano scale information materials and devices fabricated by using the organic/inorganic nano templates.

Thermal Stability Improvement of Ni-silicide Using Ni-Co alloy for Nano-Scale CMOSFET Technology (나노급 CMOSFET을 윈한 Ni-Co 합금을 이용한 Ni-silicide의 열안정성 개선)

  • Park, Kee-Young;Zhang, Ying-Ying;Jung, Soon-Yen;Li, Shi-Guang;Zhun, Zhong;Lee, Ga-Won;Wang, Jin-Suk;Lee, Hi-Deok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2007.06a
    • /
    • pp.27-28
    • /
    • 2007
  • In this paper, Ni-Co alloy was used for improvement of thermal stability of Ni silicide. The proposed Ni/Ni-Co structure exhibited wide temperature window of rapid thermal process. Sheet resistance as well as cross-sectional profile showed stable characteristics in spite of high temperature annealing up to $700^{\circ}C$ for 30min. Therefore, the proposed Ni/Ni-Co structure is highly promising for highly thermal immune Ni silicide for nano-scale CMOSFET technology.

  • PDF

A Model to Support Spatial Decision Making for Selection of Ecotourism Sites in Urban and Regional Area (도시 및 지역의 생태관광지 선정을 위한 공간의사결정지원 평가모델)

  • Lee, Gwan-Gyu
    • Journal of the Korean Society of Environmental Restoration Technology
    • /
    • v.12 no.2
    • /
    • pp.50-60
    • /
    • 2009
  • A spatial decision making process is needed when a local government tries to make polices and plans for eco-tourism in urban and regional site scale. This study aimed to suggest an assessment model to support spatial decision making on planning and making polices for eco-tourism. The model composes 6 stages of 'setting up ecogeographic territories'. 'value analysis method as ecotourism resources' 'synthetic assessing', 'grading values', 'selecting main resources for ecotourism' and 'spatial decision making support'. Applying the model to Shiheung city in Kyounggi province, validity was secured. By using the model, it was possible to make some decisions effectively such as selection of ecotourism resources, decision of the priorities of polices for ecotourism, and setting up the type of ecotourism to be introduced. In addition, by visualizing high valued resources and areas for ecotourism it w possible to support to make plans and policies effectively.