• 제목/요약/키워드: Advanced techniques

검색결과 2,322건 처리시간 0.029초

반복학습제어를 기반으로 한 회분공정의 고급제어기법 (Advanced Control Techniques for Batch Processes Based on Iterative Learning Control Methods)

  • 이광순
    • Korean Chemical Engineering Research
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    • 제44권5호
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    • pp.425-434
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    • 2006
  • 석유화학공업으로 대표되는 공정산업의 연속공정들은 지난 20여 년간 모델예측제어를 중심으로 고급제어(APC)기법들이 도입되며 운전성 및 생산성 향상에 많은 진보를 이루었다. 이에 반하여 중합반응기를 비롯한 각종 회분공정에는 APC 기법의 도입이 아직 활발히 이루어지지 않고 있다. 이것은 회분공정의 독특한 문제점을 극복하며 원하는 성능을 보장할 수 있는 방법론이 제시되지 못한 데에 가장 큰 이유가 있다고 할 수 있다. 그러나 최근 이러한 문제점들을 극복할 수 있는 APC 기법들이 반복학습제어(ILC)에 근거하여 개발되며 회분공정 APC 환경에 큰 변화가 일어나고 있다. 본 논문에서는 이들 기법들이 다양한 실제 공정에 활발하게 적용되어 운전을 개선할 수 있기를 기대하며, ILC를 기반으로 한 최근의 회분공정 APC 연구동향을 이론과 실례를 통해 소개한다.

나노 반도체 소자를 위한 펄스 플라즈마 식각 기술 (Application of Pulsed Plasmas for Nanoscale Etching of Semiconductor Devices : A Review)

  • 양경채;박성우;신태호;염근영
    • 한국표면공학회지
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    • 제48권6호
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    • pp.360-370
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    • 2015
  • As the size of the semiconductor devices shrinks to nanometer scale, the importance of plasma etching process to the fabrication of nanometer scale semiconductor devices is increasing further and further. But for the nanoscale devices, conventional plasma etching technique is extremely difficult to meet the requirement of the device fabrication, therefore, other etching techniques such as use of multi frequency plasma, source/bias/gas pulsing, etc. are investigated to meet the etching target. Until today, various pulsing techniques including pulsed plasma source and/or pulse-biased plasma etching have been tested on various materials. In this review, the experimental/theoretical studies of pulsed plasmas during the nanoscale plasma etching on etch profile, etch selectivity, uniformity, etc. have been summarized. Especially, the researches of pulsed plasma on the etching of silicon, $SiO_2$, and magnetic materials in the semiconductor industry for further device scaling have been discussed. Those results demonstrated the importance of pulse plasma on the pattern control for achieving the best performance. Although some of the pulsing mechanism is not well established, it is believed that this review will give a certain understanding on the pulsed plasma techniques.

An Advanced Method of Simulation and Analysis for Electromagnetic Environment on the Mobile Receiver in a Shielded Anechoic Chamber

  • Kim, Jung-Hoon;Rhee, Joong-Geun
    • Journal of electromagnetic engineering and science
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    • 제6권4호
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    • pp.229-234
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    • 2006
  • This paper presents an advanced method of simulation for EM(electromagnetic) environment that affects on mobile receivers. A new calibration algorithm in the process of simulation is introduced. With a proposed calibration method, the time required for simulation is reduced and this makes it possible to simulate a near-real time EM environment in a shielded anechoic chamber. EM environment data acquisition and logging techniques with GPS for simulation were developed.

Neural and Genetic Basis of Evasion, Approach and Predation

  • Park, Seahyung;Ryoo, Jia;Kim, Daesoo
    • Molecules and Cells
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    • 제45권2호
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    • pp.93-97
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    • 2022
  • Evasion, approach and predation are examples of innate behaviour that are fundamental for the survival of animals. Uniting these behaviours is the assessment of threat, which is required to select between these options. Far from being comprehensive, we give a broad review over recent studies utilising optic techniques that have identified neural circuits and genetic identities underlying these behaviours.

A Study on the Development of Measurement Techniques for Thermal Flows in MEMS

  • Ko Han-Seo;Yang Sang-Sik;Yoo Jai-Suk;Kim Hyun-Jung
    • Journal of Electrical Engineering and Technology
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    • 제1권3호
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    • pp.387-395
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    • 2006
  • A review on advanced flow visualization techniques is presented particularly for applications to micro scale heat and mass transport measurements. Challenges, development and applications of micro scale visualization techniques are discussed for the study of heating/evaporating thin films, a heated micro channel, and a thermopneumatic micro pump. The developed methods are (1) Molecular Tagging Fluorescence Velocimetry (MTFV) using 10-nm caged seeding molecules (2) Micro Particle Velocimetry (MPIV) and (3) Ratiometric Laser Induced Fluorescence (LIF) for micro-resolution thermometry. These three methods are totally non-intrusive techniques and would be useful to investigate the temperature and flow characteristics in MEMS. Each of these techniques is discussed in three-fold: (1) its operating principle and operation, (2) its application and measurement results, and (3) its future challenges.

조선해양공학 분야의 가시화기법 (Visualization Techniques for Marine Engineering Research)

  • 현범수;도덕희
    • 한국가시화정보학회지
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    • 제1권2호
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    • pp.3-12
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    • 2003
  • This paper describes the general aspects of various visualization techniques employed for marine engineering research including classical naval architecture, ocean engineering and other related topics. Visualization techniques performed mostly by authors' were introduced here, which range from old fashioned methods such as paint and tuft tests to the newly emerging PIV technique and Sonar in broad sense. Brief explanation of each technique was made for the instruction purposes. It is strongly recommended that the interdisciplinary project with experts in other research areas is necessary in order to develop more advanced and profitable techniques.

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패션페인팅(Fashion Painting)을 이용한 의상디자인 연구 (A Study on Fashion Design by Application of Fashion Painting)

  • 정경복;이정희
    • 복식문화연구
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    • 제18권1호
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    • pp.205-215
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    • 2010
  • In modern society as people adapt to social and cultural changes, people prefer high-scarcity designed products rather than standardized ones. Consequently, this adaptation lays a foundation in art and cultural domains to express uniqueness and individuality. The purpose of this study is to develop fashion designs by fusing fashion painting and handicraft techniques through creative and various artistic expressions. The researchers studied the sociocultural background of modern handicraft fashion using document-based research methods. Based on the characteristics of modern handicraft, we produced six garments that applied fashion painting techniques. In this study, the origin of fashion painting was found in ornaments such as tattoo or body-painting. We determined that modern designers were using various fashion painting techniques and motives as unique and advanced ornamentary skills. Harmonizing various handicraft techniques(dyeing, embroidery, quilt, patchwork, beads, fashion painting, etc.) centered on fashion painting enabled creation of unique fashion design through varieties of artistic expressions.