• 제목/요약/키워드: Tool Compensation

검색결과 300건 처리시간 0.028초

중소기업 근로자의 복지환경이 직무 만족도에 미치는 영향 (A Study on the Effect of Small and Medium Enterprise Workers' Welfare Environment on Job Satisfaction)

  • 곽노학;김문준
    • 산업진흥연구
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    • 제1권1호
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    • pp.19-25
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    • 2016
  • 본 연구는 중소기업 근로자를 대상으로 업무 및 복지환경 등에 대한 만족도 현황을 파악하여 미흡한 사항은 개선을 통해 전반적인 만족도의 향상을 도모하는데 있다. 측정도구의 신뢰도를 검증하기 위해 신뢰도 분석을 실시한 결과, 모든 요인의 신뢰도 계수는 0.6 이상으로 다소 높은 것으로 나타났다. 관계 요인과 복지 만족도, 보상 요인과 복지 만족도를 제외한 모든 변수 간의 상관관계가 +0.2 이상 +0.8 미만으로 양의 상관관계가 있는 것으로 나타났다. 직무 요인, 관계 요인, 보상 요인이 직무 만족도와 복지 만족도에 미치는 영향을 알아보기 위해 직무 요인, 관계 요인, 보상 요인을 독립변수로 하고 직무 만족도와 복지 만족도 각각을 종속변수로 하여 다중회귀분석을 실시한 결과, 세 요인 중 직무 요인과 보상 요인, 두 요인이 직무 만족도에 유의한 영향을 미치는 것으로 나타났다. ${\beta}$값을 보면 직무 요인(.584), 보상 요인(.369) 순으로 직무 만족도에 미치는 영향이 큰 것으로 나타났다. 업무 및 복지환경 개선을 통하여 직원들의 만족도가 향상됨으로써, 업무에 적극적인 자세로 임하여 외부고객의 만족도에 긍정적인 영향을 미칠 것으로 기대된다.

유압기계식 거버너의 실습용 시뮬레이션 모듈과 안정도의 조정 특성 (A simulation module to practice hydraulic mechanical governors and its adjustment characteristics for stability)

  • 최순만
    • Journal of Advanced Marine Engineering and Technology
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    • 제37권5호
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    • pp.533-540
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    • 2013
  • 거버너의 특성은 기관 운전에 큰 영향을 미치므로 이에 대한 운전자의 조정관리가 필요하나 PID 연산을 기초로 하는 디지털 거버너와 달리 유압식 거버너는 안정도의 조정 방식에서 큰 차이가 있다. 이러한 관계의 이해에는 실물장치의 유압식 거버너로 직접 실습하는 것이 효과적이나 엔진을 구동해야 하는 등 현실적인 어려움이 있으므로 본 연구에서는 시뮬레이션 모듈의 방법으로 안정도 등의 조정 실습이 가능하도록 주요 특성을 구현하였다. 거버너 모듈에는 스피드 설정, 스피드드룹 및 니들밸브와 보상포인터 등의 조정 파라미터가 포함되었으며 2차 함수의 엔진 전달함수를 결합하였다. 이로부터 안정도에 관련되는 조정 파라미터를 가변시킬 때 얻어지는 시스템에서의 속도 및 연료량의 응답 결과를 분석한 결과 제시된 모듈이 유압기계식 거버너의 제작자가 정하고 있는 니들밸브 및 보상지침의 일반적인 조정절차를 따라 조정 실습이 가능한 특성을 나타낸다는 것을 확인하였다.

전류보상 및 보호 기능을 갖는 BLU용 LED Driver IC설계 (LED driver IC design for BLU with current compensation and protection function)

  • 이승우;이중기;김선엽
    • 한국산학기술학회논문지
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    • 제21권10호
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    • pp.1-7
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    • 2020
  • 최근 LED 디스플레이 시스템이 활발히 보급됨에 따라서 시스템 구동을 위한 LED 드라이버의 효과적인 제어방법에 대한 연구가 진행 중이다. 그 중에 가장 대표적인 것이 LED Driver 채널의 균일한 밝기 제어이다. 본 논문 에서는 채널 휘도 편차 최소화를 위한 전류보상 및 시스템 보호 기능을 갖는 BLU용 LED driver IC를 제안하였다. 제안하는 LED Driver IC는 채널 간 ±3% 이내의 current accuracy와 150mA 채널 전류를 목표로 설계하였다. 설계 사양을 만족시키기 위해 채널 구동 PWM 신호를 이용한 chopping 동작을 수행하도록 하여 채널 앰프 옵셋을 상쇄할 수 있도록 하였다. 또한 pre-charge기능을 구현하여 빠른 동작 속도와 채널간 휘도 편차를 최소화할 수 있도록 하였다. LED에러(오픈, 쇼트), 스위치 TR 쇼트 감지 및 동작 온도 보호 회로를 설계하여 IC 및 BLU시스템을 보호할 수 있도록 하였다. 제안된 IC는 Cadence 및 Synopsys사의 Design Tool을 사용하여 설계 하였으며, Magnachip 0.35um CMOS 공정을 사용하여 제작되었다. 제작된 LED driver IC는 채널 간 ±1.5% 이내의 current accuracy와 150mA 채널 출력특성을 만족하였으며, 평가 보드를 통해 에러 검출 회로들이 정상 동작함을 확인하였다.

주민참여 도구로써 가로경관 디자인 가이드라인 구성 연구 (A Study on The Structure and Contents of Streetscape Design Guideline as a Tool of Residents' Participation)

  • 강혜연;이연숙
    • KIEAE Journal
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    • 제12권4호
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    • pp.59-69
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    • 2012
  • In order to create humanitarian living environment with sustainable ecological environment, urban regeneration project has been implemented recently seeking diverse methods for residents'participation stressing the process of communication with the residents changing from the existing one way planning by limited number of experts. Particularly, it is essential to develop systematic tools to promote the voluntary and positive participation of the residents because residents have to perform as the master of urban streetscape design project that requires sophisticated knowledge and experience and also because the residents have to function as sustainable maintainers and managers of their streetscape. This study intends to identify the organizational structure and major contents of design guideline as a tool to support the voluntary and positive participation of the residents in streetscape maintenance. For this purpose based on the structural system and characteristics of Chicago streetscape design guideline that was developed as tool for residents' participation, efforts were made to set up framework of design guideline for sustainable streetscape project with the users' participation with their overall understanding and trust. In detail, the author studied the resident participatory process for sustainable maintenance and management in a long term landscape project and the principle and theories of design planning for streetscape that supports the utilizing behaviors of the users, and how this information should be linked and organized to form the structure and contents of design guideline. As a tool supporting residents' participation and helping the residents perform the responsible function as sustainable maintainers and managers of their streetscape through social maturity with ontological sense of masters of their local community as they experience the gradual processes of their streetscape maintenance project, streetscape design guideline has its meaning in the efforts that tried to achieve deep participation of the residents through researches converging the two academic sectors of urban architecture and social psychology.

공작기계용 센서노드 설계 및 제작기술 (Designing and Manufacturing Technology of Sensor Node for Machine Tools)

  • 장동영;권오성;박만진;김승재
    • 한국정밀공학회지
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    • 제31권7호
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    • pp.569-576
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    • 2014
  • Sensor node means a device to include sensor, amplifier, and data acquisition (DAQ) equipment. The sensor converts physical signals to electric signals and weak signals from the sensor can be amplified through the amplifier. DAQ equipment converts analog signal to digital signal and collects converted digital signal. Since the sensor node is sensitive to the environment so that selection of mounting position and fixture design of sensor are applied differently depending on the characteristics of a target. This study is about designing and manufacturing sensor node to be used in a machine tool. The environment of machine tool is very severe due to noise, temperature fluctuation, and dust, etc. Hence, the sensor and amplifier must be designed and manufactured by considering the environmental issues. The designed and manufactured sensor node was tested for the reliability and effectiveness of the developed sensor nodes in the study.

타원궤적 진동절삭기의 타원궤적 보정 (Compensating the Elliptical Trajectory of Elliptical Vibration Cutting Device)

  • 노병국;김기대
    • 한국정밀공학회지
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    • 제28권7호
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    • pp.789-795
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    • 2011
  • In elliptical vibration cutting (EVC), cutting performance is largely affected by the shape of an elliptical path of the cutting tool. In this study, two parallel piezoelectric actuators were used to make an elliptical vibration cutting device. When harmonic voltages of $90^{\circ}$ out-of-phase are supplied to the EVC device, creation of an ideal elliptical trajectory whose major and minor axes are parallel to the cutting and thrust directions is anticipated from a kinematic analysis of the EVC device, however, the paths we experimentally observed showed significant distortions in its shape ranging from skew to excessive elongation of the major axis of the ellipse. To compensate distortions, an analytical model describing the elliptical path of the cutting tool was developed and verified with experimental results, and based on the analytical model, the distorted elliptical paths created at 100 Hz, 1 kHz, and 16 kHz were corrected for skew and elongation.

Control of PKM machine tools using piezoelectric self-sensing actuators on basis of the functional principle of a scale with a vibrating string

  • Rudolf, Christian;Martin, Thomas;Wauer, Jorg
    • Smart Structures and Systems
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    • 제6권2호
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    • pp.167-182
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    • 2010
  • An adaptronic strut for machine tools with parallel kinematics for compensation of the influence of geometric errors is introduced. Implemented within the strut is a piezoelectric sensor-actuator unit separated in function. In the first part of this contribution, the functional principle of the strut is presented. For use of one piezoelectric transducer as both, sensor and actuator as so-called self-sensing actuator, the acquisition of the sensing signal while actuating simultaneously using electrical bridge circuits as well as filter properties are examined. In the second part the control concept developed for the adaptronic strut is presented. A co-simulation model of the strut for simulating the controlled multi-body behavior of the strut is set-up. The control design for the strut as a stand-alone system is tested under various external loads. Finally, the strut is implemented into a model of the complete machine tool and the influence of the controlled strut onto the behavior of the machine tool is examined.

초정밀가공의 재질에 따른 발열과 가공정밀도에 관한 연구 (A Study on Heat Generation and Machining Accuracy According to Material of Ultra-precision Machining)

  • 이경일;김재열
    • 한국기계가공학회지
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    • 제17권1호
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    • pp.63-68
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    • 2018
  • At present, ultra-precision cutting technology has been studied in Korean research institutes, focusing on development of ultra-precision cutting tool technology and ultra-precision control engineering. However, the developed technologies are still far behind advanced countries. It focuses on metals including aluminum, copper and nickel, and nonmetals including plastics, silicone and germanium which require high precision while using a lathe. It is hard to implement high precision by grinding the aforementioned materials. To address the issue, the ultra-precision cutting technology has been developing by using ultra-precision machine tools very accurate and strong, and diamond tools highly abrasion-resistant. To address this issue, this study aims to conduct ultra-precision cutting by using ECTS (Error Compensation Tool Servo) to improve motion precision of elements and components, and compensate for motion errors in real time. An IR camera is used for analyzing cutting accuracy differences depending on the heat generated in diamond tools in cutting to examine the heat generated in cutting to study cutting accuracy depending on generated heat.

와우 갑각 전기자극 뇌간유발반응용 원추형 전극의 개발 (Development of Cone-Shaped Electrode for Promontory Stimulation Electrically Auditory Brainstem Response)

  • 허승덕;정동근;강명구;김리석;고도흥
    • 음성과학
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    • 제10권4호
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    • pp.181-187
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    • 2003
  • This paper introduces a new zinc coated copper wire electrode with coiled cone shape which has low surface resistance and tolerance to the motion artifact for promontory stimulation electrically auditory brainstem responses (PSEABR). Auditory brainstem responses (ABR) can be used to predict hearing threshold level with a great deal of accuracy particularly for a young child who cannot cooperate mechanically and some hearing impaired who are exaggerating a hearing loss for economic compensation. While severe profound sensorineural hearing losses may not be implemented by auditory potentials, PSEABR is proven as a useful tool even for some sensorineural related hearing impaired. It was shown that PSEABR gives the electrical stimuli to promontory of the cochlear instead of giving acoustic stimuli. For this reason, PSEABR can be used as an alternative for cochlear implantation, and can also be used as an optimal device selection and neural information for MAP. It was found that the role of electrode is very important in PSEABR. Even though this cone-shaped electrode was applied in animal experiments, waveforms are well produced by PSEABR. Thus, it was concluded that cone-shaped electrode turned out to be a useful preoperative audiological evaluation tool in deciding time for cochlear implantation surgery.

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다이아몬드 터닝머신에서 다중점 B 축 제어 가공법을 통한 표면거칠기 향상 (Improvement in Surface Roughness by Multi Point B Axis Control Method in Diamond Turning Machine)

  • 김영복;황연;안중환;김정호;김혜정;김동식
    • 한국정밀공학회지
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    • 제32권11호
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    • pp.983-988
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    • 2015
  • This paper details a new ultra-precise turning method for increasing surface quality, "Multi Point B Axis Control Method." Machined surface error is minimized by the compensation machining process, but the process leaves residual chip marks and surface roughness. This phenomenon is unavoidable in the diamond turning process using existing machining methods. However, Multi Point B axis control uses a small angle (< $1^{\circ}$) for the unused diamond edge for generation of ultra-fine surfaces; no machining chipping occurs. It is achieved by compensated surface profiling via alignment of the tool radial center on the center of the B axis rotation table. Experimental results show that a diamond turned surface using the Multi Point B axis control method achieved P-V $0.1{\mu}m$ and Ra 1.1nm and these ultra-fine surface qualities are reproducible.