• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 1부
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• pp.366-371
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• 2008

본 논문에서는 터치스크린이 장착된 윈도우 시스템에서 촉각 피드백을 사용해 윈도우 인터페이스와 상호작용하는 방법 및 체계를 제안한다. 사용자가 터치 스크린을 통해 윈도우 인터페이스와 상호작용할 때 발생하는 주요 이벤트는 윈도우 인터페이스 메시지 필터(Windows Interface Message Filter: WIMF)에 의해 감지되고, 촉각 정보 제공기(Haptic Information Provider: HIP)를 통해 적절한 촉각 정보로 변환되어 본 연구에서 제안한 스타일러스형 햅틱 인터페이스를 통해 사용자에게 촉각 자극을 전달한다. 본 연구에서는 윈도우 환경의 주요한 조작 방법인 버튼 클릭, 메뉴 선택 및 팝업, 창/아이콘 선택 및 끌어놓기(drag & drop), 스크롤에 대하여 촉각 피드백을 구현하였다. 피험자 실험결과 촉각 피드백은 상호작용하는 인터페이스 객체가 선택되었는지에 대한 사용자의 직관을 증대시켰으며, 인터페이스 객체의 위치 및 크기 조절 시 인터페이스의 정교한 조작을 도와 사용성을 증대시켰다.

• Tribology and Lubricants
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• 제33권4호
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• pp.148-152
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• 2017

The feel of writing is important to customers when they buy smart devices with stylus such as smartphones and tablet computers. With an aim to reproduce the tactile sensibility of writing instruments when people write on the glass display using a stylus, this study focuses on the frequency characteristics of writing instruments that can describe the vibrations of writing instruments sliding over counter surfaces. In addition, this study includes the effect of various factors influencing the friction of writing instruments such as lubricant, nib material, and contact type. We perform sliding experiments with six types of writing instruments and a sheet of paper to understand the relation between the friction conditions of the nib and the frequency characteristics. As this research focuses on the tactile perception of human skin when people use a writing instrument, the analysis of frequency characteristics is performed in the perceptible frequency range of mechanoreceptors in the human skin. As a result, three types of frequency characteristics are identified. Low frequency peaks are observed for a metal nib with ink; high frequency peaks are observed for a nib without ink; and, middle frequency peaks with a wide range of distribution occurs for fabric nibs with ink. Therefore, to implement the proper feel of writing, at least three types of vibrations have to be made.

• 대한기계학회논문집
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• 제8권2호
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• pp.104-110
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• 1984

본 연구에서는 유압식 방법보다 절삭 정밀도가 높고 전기신호를 사용함으로 인한 조작과 증폭이 간단하고 특성 개선을 위한 조작과 증폭이 간단하고 특성 개선을 위한 계의 보상(sysyem compensation)을 할 수 있는 전기 유압식 모방장치를 설계, 제 작하여 그 성능을 실험적으로 해석하였다.

• 대한기계학회논문집A
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• 제24권5호
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• pp.1254-1260
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• 2000

There have been many developments in super precision working technique and working method up to, now. But, it is very difficult to evaluate working surface accurately without the technicians experience and judgment. Surface roughness tester using stylus was used to measure surface condition generally But this method is not so desirable because of damage on test piece caused by contact between the workpiece and the stylus sensor. As a result, non-contact method was known as a good way to carry, out this process without damage. However, this is a difficult one among the various measuring methods. So we are tying to suggest a new method using texture analysis through image processing to get a surface information in worked test piece. Co-occurrence matrix using difference of gray levels between a pixel and its neighboring one was used to study behavior of surface roughness and to J acquire data for analysis. Standard specimen was adapted to verify this research. We suggest texture information method in order to evaluate surface state for the best measurement system.

• 한국정밀공학회지
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• 제22권11호
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• pp.64-71
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• 2005

In order to measure surface roughness profile, stylus type equipments are commonly used, but the stylus keeps contact with surface and damages specimens by its tip pressure. Therefore, optics based measurement systems are developed, and light phase interferometer, which is based on light interference phenomenon, is the most noticeable research. However, light interference based measurements require translation mechanisms of nano-meter order in order to generate phase differences or multiple focusing, thus the systems cannot satisfy the industrial need of on-the-machine and in-process measurement to achieve factory automation and productive enhancement. In this research, we focused light reflectance phenomenon rather than the light interference, because reflectance based method do not need translation mechanisms. However, the method cannot direct]y measure surface roughness profile, because reflected light consists of several components and thus it cannot supply surface height information with its original form. In order to overcome the demerit, we newly proposed an image processing based algorithm, which can separate reflected light components and conduct parameterization and reconstruction process with respect to surface height information, and then confirmed the reliability of proposed algorithm by experiment.

• 한국정밀공학회지
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• 제19권3호
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• pp.39-45
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• 2002

A simple and low cost stylus profiler made of ferrite cores is developed. The devised profiler consists of a contact probe, a measuring transducer, a signal processing unit, and a motorized stage. The contact probe attached to 4-bar spring maintains sufficient stiffness to protect disturbances. An overlap-area type inductive position sensing system is selected as a measuring transducer, which has high sensitivity, repeatability and linearity. The transducer is composed of coil bundles and ferrite cores which have good electromagnetic characteristics in spite of low cost. The repeatability of the profiler with the proposed inductive sensing system is better than 50nm. Experimental results are shown that the proposed profiler can measure the line or 3D profile of an object with sub-micron features.

• 대한치과보철학회지
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• 제25권1호
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• pp.253-267
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• 1987

The purpose of this study was to improve limitations and disadvantages of the mechanical pantograph and the Visi-Trainer, and to design the reliable and reproducible device mandibular movement tracking device (MMTD) that is more simple, convenient and save the chair time than the mechanical pantograph and Visi-Trainer. MMTD was consist of head frame, horizontal bar, condylar path tracking stylus holders, anterior path tracking stylus holder, two condylar path plastic recording plates, one anterior path plastic recording plate, toggles and open occlusal clutch. To prove the reliability and reproducibility of MMTD, a five adults were selected and mandibular condylar movement was recorded one time by the mechanical pantographic tracing and MMTD. The border movement recording of the mandibular incisor (frontal, sagittal and horizontal) was also recorded by Visi-Trainer and the MMTD. The obtained results were as follows; 1. The condylar movement path (sagittal, horizontal) of the MMTD was not coincidence with that of mechanical pantograph. 2. Measurements of the angulation which established between working and balancing path records by use of the mechanical pantograph and MMTD, there was no significance. 3. In a view of MMTD's reproducibility, there was revealed almost similar recording pattern. 4. The border movement recording of the mandibular incisor by the MMTD and the Visi-Trainer showed almost same reliability and reproducibility. 5. The subjects were able to his original mandibular movements by use of open occlusal clutch in the MMTD.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1995년도 춘계학술대회 논문집
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• pp.1-8
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• 1995

This paper proposed a simple method for measuring surface roughness of ground surface. utilizing non-contact in-process measuring system using the diode laser. The measurement system is consisted of a laser unit with a diode laser and a cylindrical lens a detecting unit with polygon mirror and CCD array sensor. and a signal processing unit with a computer and device. During operation, this measuring system can provide information on surface roughness in the measuring distance with a single sampling and simultanilusly monitor the state of the grind wheel. The experimental results, showed that the increase of the feed rate and the dressing speed an caused increase in the surface roughness and when the surface roughness is 4Rmax-10Rmax, the cutting speed is 1653m/min-1665m/min. the feed rate is 0.2m/min-0.9m/min, the dressing speed is 0.2mm/rev-0.4mm/rev, the stylus method and the in-process method can be obtained the same results. thus under limited working conditions. using the proposed system. the surface roughness of the ground surface during cylindrical grinding can be obtained through the in-process measurement method using the diode laser.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 2002년도 proceedings of the second asia international conference on tribology
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• pp.259-260
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• 2002

In this paper, electrical discharge machined (EDM) surfaces machined with various machining parameters are characterized and simulated. Three-dimensional surface topography of EDM surfaces are measured by a stylus instrument. Surface topography is characterized with auto-correlation coefficient and height probability density functions. Then, EDM surfaces are modeled and computer-simulated by using the non-causal 2-D auto-regressive model. Simulation results show that EDM surfaces are characterized well by a few parameters.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국제학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.541-544
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• 1993

This paper attempts to propose new procedures to evaluate roughness of ground metallic surface in the range of 1-10.mu.m from data gained by an optical, in-process measurement of the surfaces. Studies are made to process the data of reflected lights pointed at the surface to be measured. Results obtained are compared with those of measurement by stylus roughness meter. Correlations between the two types of roughness measurement are well. The proposed method can be used as a sensor for a polishing robot.