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수출식품산업의 국제경쟁력 확보를 위한 식품안전국가인증제
백상우(Sang-Woo Baek),김소희(So-Hee Kim),조재진(Jae-Jin Cho),안영순(Yeong-Soon Ahn),조아라(Ah-Ra Cho) 한국식품과학회 2021 식품과학과 산업 Vol.54 No.2
To resolve difficulties of export process and strengthen competitiveness, Korea National Food Safety Certificate (K-NFSC), a comprehensive food safety support system, has been promoted to introduction. K-NFSC is at a developmental stage where the government certifies the safety of exported K-foods by developing Korean certification system based on HACCP and food safety management added for international use, and provides consulting on regulations of customs clearance and safety test analysis of food intended for export. To apply for the Global Food Safety Initiative (GFSI) technical equivalence in 2022, developmental direction of Korean certification system is set referring to FSSC22000. If selected as participants of an export supporting project, regulatory information such as customs clearance procedures and food labeling will be provided. In addition, the results of safety test analysis will be certified to help export products pass customs entry. K-NFSC is expected to support K-food exports and be growth engine for K-food industry.
A Precision Line Profile Measurement Technique Using Multi Probe Error Separation Method
백상우(Sang Woo Baek),조남규(Nahm Gyoo Cho) Korean Society for Precision Engineering 2020 한국정밀공학회지 Vol.37 No.9
In this research, a precise on-machine line-profile measuring system that compensates for the motion-error from the linear-guide, which can influence the accuracy of the measurement of the profile was developed. For this purpose, the principle of measuring the system model was used to analyze the compensating motion error component for line-profile and 3 types of MPES method (Integration-Method, the Fourier-Model-Method, and the Sequential-Method). The multi-probe-error-separation-method (MPES) was applied to calculate the motion-error, which in turn was used to compensate for the measured linear-profile of the specimen. Lastly, the simulation conditions involving a multi-probe measurement system consisting of a reference-artifact, capacitive-sensor, and three displacement-sensors were designed and Monte-Carlo simulation was implemented for the evaluation of the 3 types of MPES method. Also, the simulation results obtained from the conventional measuring system and the proposed system were compared for the verification of the performance of the latter. Consequently, efficient compensation of the motion error appeared as possible and the applicability of the multi-probe measurement system was confirmed.
Development of 3-DOF Force Sensor Using Dual-Nozzle 3D Printing
백상우(Sang Woo Baek),구민석(Min Seok Gu),주용천(Yong Quan Zhou),조남규(Nahm Gyoo Cho) Korean Society for Precision Engineering 2020 한국정밀공학회지 Vol.37 No.10
In this paper, a multi-material non-assemble 3-DOF Force-Sensor was proposed and developed to improve the efficiency in the manufacturing. The PLA-Filament was used to produce the frame-structure and the elastic-deformation, and the conductive-PLA-filament, to produce a transducer. A dual-nozzle 3D-Printer was applied to produce the monolithic-structuretype force-sensor with the multi-materials simultaneously in single-manufacturing-process. The sensor was designed in a tripod-structure to detect the 3-DOF force-components in an external-force and a mechanical-interpretation was conducted on the elastic-deformation, which acts as a load-cell. The output model of a Wheatstone-bridge circuit-based transducer serving as a strain-gauge was also produced. A calibration-testing device, comprising a rotating stage, which turns with 2- DOF (θ, ϕ), was also developed to apply force in every direction. By conducting the calibration test, the relations between the input and output were computed in as a matrix and the resolution of the sensor was determined through the evaluation of linearity and stability deviations.
정밀 원통 부품의 4-프로브법을 이용한 온-머신 측정 기술
백상우(Sang-Woo Baek),조남규(Nahm-Gyoo Cho),배민한(Min-Han Bae) 한국생산제조학회 2020 한국생산제조학회지 Vol.29 No.3
In this research, an on-machine measurement system is developed, in which the multiprobe error separation (MPES) method is applied to give feedback on errors from the machining tools. To measure the roundness of the cross-sectional form-component (roundness and diameter) of the workpiece, the principle of the Fourier model-based MPES method was analyzed to solve the major problem of harmonic distortion in this technique. Using this process, the on-machine measurement system was created for machining equipment, and its performance was evaluated. The comparison between the proposed system and the general one-probe-based measuring system showed that performance of the former was 25 times better than that of the latter. This indicates the possibility of effective compensation of the motion error of rotors.