• Title/Summary/Keyword: Process compensation

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A Study on the Error Compensation of Machine Tool Position Using Reference Artifact and On-Machine Probe (기준물을 이용한 공작기계 위치오차 보정기술에 관한 연구)

  • Jo, Nam-Gyu;Park, Jae-Jun;Jeong, Seong-Jong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.9
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    • pp.1317-1324
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    • 2001
  • In this paper, a methodology of geometrical error identification and compensation for NC machine tool position is developed. We propose a reference artifact with measuring the geometry of coordinate system for compensating linear scale error of NC machine. The coordinate system of the NC machine could be compensated successfully with the information obtained by measuring the reference artifact and our compensation algorithm. Monte Carlo simulation is used to evaluate coordinate referencing ability and, the uncertainties of the machine tool position is estimated and observed through the compensation process by simulation.

A Design of 8-bit Switched-Capacitor Cyclic DAC with Mismatch Compensation of Capacitors (캐패시터 부정합 보정 기능을 가진 8비트 스위치-캐패시터 사이클릭 D/A 변환기 설계)

  • Yang, Sang-Hyeok;Song, Ji-Seop;Kim, Su-Ki;Lee, Kye-Shin;Lee, Yong-Min
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.2
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    • pp.315-319
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    • 2011
  • A switched-capacitor cyclic DAC scheme with mismatch compensation of capacitors is designed. In cyclic DAC, a little error between two capacitors is accumulated every cycle. As a result, the accumulated error influences the final analog output which is wrong data. Therefore, a mismatch compensation technique was proposed and the error can be effectively reduced, which alleviates the matching requirement. In order to verify the operation of the proposed DAC, an 8-bit switched-capacitor cyclic DAC is designed through HSPICE simulation and implemented through magna 0.18um standard CMOS process.

Development of a Work-Related Injury and Illness Monitoring Geographic Information System using Workers' Compensation Insurance Big Data (산재보험 빅데이터를 활용한 산재 모니터링 지리정보시스템 개발)

  • Yoo, Dong Hee;Chung, Suk Hoon;Lee, Jeong Hwa;Choi, Keun Ho
    • The Journal of Information Systems
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    • v.31 no.2
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    • pp.217-238
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    • 2022
  • Purpose This study aims to develop a work-related injury and illness monitoring geographic information system that analyzes and visualizes the types of work-related injury and illness based on workers' compensation insurance big data. Design/methodology/approach Using the developed system, we explained the process of monitoring the areas of the applied workplace, medical care application, index, and medical care institution. We also showed examples of analyzing the index and medical care institution area. By applying the system, we can intuitively recognize the current status of workers' compensation insurance and confirm the basic information necessary for managing the current status of workers' compensation insurance. Findings We generated more helpful information by combining workers' compensation insurance data and designated medical care institution data. We were able to apply the severity score and the vulnerability index of work-related injury and illness to the system as a demonstration. To efficiently manage workers' compensation insurance, it was necessary to integrate workers' compensation insurance and designated medical care institution data, as well as the data from various sources.

Service Recovery and Employees' Authenticity: Focusing on the Moderating Effects of Authenticity on Service Compensation (서비스 실패 회복과 종업원 진정성: 서비스 보상에 대한 진정성의 조절효과를 중심으로)

  • Lee, Shuai;Noh, Yonghwi;Choi, Seung Kook
    • Journal of Korean Society for Quality Management
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    • v.51 no.2
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    • pp.247-261
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    • 2023
  • Purpose: This study investigates the relationship between service compensation, consumer sentiment and revisit intention for service recovery in the Chinese foodservice industry, and the moderating effect of employee authenticity. Methods: Data were collected from people who experienced eating out in a city located in central China, and the hypothesis was verified through multiple regression analysis and hierarchical regression analysis. Results: The results indicate that the specificity of compensation affects both positive and negative emotions of customers, and the activeness of compensation also influences positive emotions of customers. Also, employee autheticity moderates the effect of specificity of compensation on customers' positive emotions. Both positive and negative emotions of customers influences revisit intention. Conclusion: These results show that the role of service compensation is important in service recovery in the rapidly expanding Chinese foodservice industry. In addition, since the sincerity of employees plays an important role in maximizing the recovery effect in the process of service recovery, it suggests that it is important not only to improve services in the quantitative aspect but also in the qualitative aspect through employee training.

Recent Progress on Voltage Drop Compensation in Top Emission Organic Light Emitting Diodes (OLED)

  • Jeong, Byoung-Seong
    • Journal of the Semiconductor & Display Technology
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    • v.19 no.1
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    • pp.49-54
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    • 2020
  • The voltage drop due to the thin cathode film at the large size top emission OLED panel was successfully compensated with making electrical contact between thin cathode and anode auxiliary electrode by 355nm wavelength of laser. It was found that the luminance uniformity dramatically increased from around 15% to more than 80% through this electrical compensation between thin cathode and anode auxiliary electrode. Moreover, the removing process for EL materials on the anode auxiliary electrode process by laser was very reliable and stable. Therefore, it is thought that the EL removal method using laser to make electrical contacts is very appropriate to mass production for such a large size top emission OLEDs to obtain high uniformity of luminance.

Improvement of Form Accuracy in Curved Dies and Molds Using Compensation of Finishing Tool (연마 공구의 압력 보정에 의한 곡면 금형의 형상 정밀도 향상)

  • 임동재;정해도;안중환;안대균
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.05a
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    • pp.866-869
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    • 2000
  • The finishing process for die is an important process because it has influence on final quality of products. And it is difficult to automatize finishing process so that the process has depended on expert's skill until now. However, recently a study on development of die automatic finishing machine has been progressed, and actually this machine is applied to fabrication of die. But die automatic finishing machine has the problems such as low supply rate and high machine price. In this paper 3-axis machine was applied to the die finishing. And to improve form accuracy of die finishing path was regenerated. The finishing path considered tilting of finishing tool. and variation of machining force with contacting point between finishing and workpiece.

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An improved approach to evaluate the compaction compensation grouting efficiency in sandy soils

  • Xu, Xiang-Hua;Xiang, Zhou-Chen;Zou, Jin-Feng;Wang, Feng
    • Geomechanics and Engineering
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    • v.20 no.4
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    • pp.313-322
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    • 2020
  • This study focuses on a prediction approach of compaction compensation grouting efficiency in sandy soil. Based on Darcy's law, assuming that the grouting volume is equal to the volume of the compressed soil, a two-dimensional calculation model of the compaction compensation grouting efficiency was improved to three-dimensional, which established a dynamic relationship between the radius of the grout body and the grouting time. The effectiveness of this approach was verified by finite element analysis. The calculation results show that the grouting efficiency decreases with time and tends to be stable. Meanwhile, it also indicates that the decrease of grouting efficiency mainly occurs in the process of grouting and will continue to decline in a short time after the completion of grouting. The prediction three-dimensional model proposed in this paper effectively complements the dynamic relationship between grouting compaction radius and grouting time, which can more accurately evaluate the grouting efficiency. It is practically significant to ensure construction safety, control grouting process, and reduce the settlement induced by tunnel excavation.

Neutronics modelling of control rod compensation operation in small modular fast reactor using OpenMC

  • Guo, Hui;Peng, Xingjie;Wu, Yiwei;Jin, Xin;Feng, Kuaiyuan;Gu, Hanyang
    • Nuclear Engineering and Technology
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    • v.54 no.3
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    • pp.803-810
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    • 2022
  • The small modular liquid-metal fast reactor (SMFR) is an important component of advanced nuclear systems. SMFRs exhibit relatively low breeding capability and constraint space for control rod installation. Consequently, control rods are deeply inserted at beginning and are withdrawn gradually to compensate for large burnup reactivity loss in a long lifetime. This paper is committed to investigating the impact of control rod compensation operation on core neutronics characteristics. This paper presents a whole core fine depletion model of long lifetime SMFR using OpenMC and the influence of depletion chains is verified. Three control rod position schemes to simulate the compensation process are compared. The results show that the fine simulation of the control rod compensation process impacts significantly the fuel burnup distribution and absorber consumption. A control rod equivalent position scheme proposed in this work is an optimal option in the trade-off between computation time and accuracy. The control position is crucial for accurate power distribution and void feedback coefficients in SMFRs. The results in this paper also show that the pin level power distribution is important due to the heterogeneous distribution in SMFRs. The fuel burnup distribution at the end of core life impacts the worth of control rods.