• 한국공작기계학회논문집
• /
• 제10권3호
• /
• pp.75-82
• /
• 2001

The continuous chip in turning operation deteriorates the precision of workpiece and can cause a hazardous condition to operator. Thus the chip form becomes a very important task for reliable turning process. The chip form is identified using the neural network of supervise data Through the measurement of energy radiated from the chip. The feed mechanism os adjusted in order to break continuous chip according to the result of the chip form recognition and it shows a good approach for precision turning operation.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 1995년도 추계학술대회 논문집
• /
• pp.271-275
• /
• 1995

Chip control is a major problem in automatic machining process, especially in finish operation. Chip breaker is one of the important factors to be determined for the scheme of chip control. As unbroken chips are grown, there deteriorate quality of the surface roughness and process automation can be carried out. In this study, to get rid of chip curling problem while turning internal hole, optimal chip breaker is selected form the experiment. The experiment is planned with Taguchi's method that is based on the orthogonal arrary of design factor. From the respose table, cutting speed, feedrate, depth of cut, and tool geometry are major factors affecting chip formation. Then, optmal chip breaker is selected and this is verified good enough for chip control from the experiment.

• 한국정밀공학회지
• /
• 제13권7호
• /
• pp.59-65
• /
• 1996

A major problem in automation of turning operations is the difficulty in obtaining a sufficient and reliable chip control. Therefore it becomes desirable to find a method which can detect the chip form. Newly born chips in usual metal cutting radiate infrared rays. When such chips run out of cutting point quickly, the radiated energy from the zone around the tool is low compared with that of the case when long tangled chips are staying around the tool. The difference in chip pattern can be detected from the output of pyrometer. But, strictly speaking, only the output of pyrometer does not identify the chip form because that is the removal of chip. Therefore, in this paper, a method of the identification of chip form using output of pyrometer and fuzzy inference is developed.

• 한국신뢰성학회지:신뢰성응용연구
• /
• 제5권2호
• /
• pp.221-239
• /
• 2005

General chip SMD parts(chip resistance, chip capacitor, chip varistor etc.) are very wide used electronics parts for IT units. But, failure modes are indistinct for these chip parts. In factory and field the failure modes are recognized to accidental failure mode caused by potential defect. In this paper used chip varistor ALT(Accelerate Life Test) test for verify general failure modes in chip SMD parts. Also the results are useful for general chip SMD ALT tests.

• 한국지능시스템학회:학술대회논문집
• /
• 한국퍼지및지능시스템학회 2004년도 춘계학술대회 학술발표 논문집 제14권 제1호
• /
• pp.251-254
• /
• 2004

Web-Bioconductor System은 유전자 분석에 대한 통계적 모듈과 그래픽 환경을 제공하는 R언어와 DNA chip 데이터의 분석을 수행하는 Bioconductor 패키지를 이용하여 웹으로 DNA chip 데이터를 분석할 수 있도록 설계한 시스템이다. 본 시스템은 DNA chip 데이터의 분석을 위해 사용자 계정 모듈, 데이터 입력 모듈, 전 처리 모듈, 유전자 차등 발현 분석 모듈, 결과 출력 모듈로 구성되어 있으며, 분석된 결과물은 HTML, 이미지, XLS 파일 형태로 제공된다. 웹을 이용하여 DNA chip 분석을 수행함으로써 인터넷이 가능한 곳이면 시간과 장소의 구분이 없이 DNA chip 데이터 분석이 가능하며, 인터넷으로 DNA chip 데이터 분석 자료를 공유할 수 있음으로 연구자들의 상호 의견 교환을 바탕으로 효율적인 분석이 가능할 것이다. 또한 기존의 R언어와 Bioconductor가 전산 지식이 부족한 사람들에게는 접근하기 어려운 점을 웹 인터페이스로 간단하게 구현함으로써 DNA chip 데이터 분석에 있어 용이성과 효율성을 중대하고 있다.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2003년도 하계종합학술대회 논문집 II
• /
• pp.899-902
• /
• 2003

Chip Pin Parasitic은 실제 Chip Pad에서부터 Bonding Wire를 통한 Package Lead Frame까지를 의미한다. 여기서, Lead Frame 및 Bonding Wire에서 Inductance 및 작은 저항이 보이고, Chip Pad에서의 Capacitance, 그리고 Pad 부터 Ground까지의 Return Path에서 발생하는 저항이 보인다. 이들을 모두 합하면 L, R, C의 Series로 나타낼 수 있다. 본 논문에서는 이런 Chip Pin Parasitic을 추출 하기 위해서 TDR(Time Domain Reflectometer)과 NA(Network Analyzer)를 사용하였는데, TDR의 경우 PCB를 제작하여 Chip을 Board위에 붙인 후 Time Domain에서 측정 하였고 NA의 경우 Pico Probe를 이용하여 Chip pin에 직접 Probing해서 Smith Chart를 통하여 Extraction 값을 추출했다. 이 경우, NA를 이용한 측정이 좀 더 정확한 Parasitic 값을 추출할 수 있으리라 예상되겠지만, 실제로 Chip이 구동하기 위해서는 Board위에 있을 때의 상황도 고려해야 하기 때문에 TDR 추출 값과 NA 추출 값을 모두 비교하였다.

• Journal of the Korean Wood Science and Technology
• /
• 제29권3호
• /
• pp.68-72
• /
• 2001

In order to effectively use the waste wood, two types of woodceramics chip tile were made from woodceramics chip, gravel, zeolite and additions. The woodceramics chip was made from branch of apple tree (Malus pumila Mill.) Snow melting property, bending strength and compressive strength of woodceramics chip tile were tested according to the mixing rate of woodceramics chip. Snow melting properties of woodceramics chip tile increased after additions treatment but mechanical properties were reduced significantly after additions treatment. The results indicate that the additions are effective for snow melting property but negative effect on mechanical properties.

• 동력기계공학회지
• /
• 제4권4호
• /
• pp.108-115
• /
• 2000

The continuous chip in turning operation deteriorates the precision of workpiece and can cause a hazardous condition to operator. Thus the chip form control becomes a very important task for reliable turning process. Using the difference of energy radiated from the chip, the chip form is identified using the neural network of supervised data. The feed mechanism is adjusted in order to break continuous chip according to the result of the chip form recognition and shows a good approach for precision turning operation.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2002년도 ITC-CSCC -3
• /
• pp.1984-1987
• /
• 2002

This paper describes the design and implementation of a single-chip digitally synthesized 0-35MHz agile function generator. The chip comprises an integrated direct digital synthesizer (DDS) with a 10-bit on- chip digital-to-analog converter (DAC) using an n-well single-poly triple-metal 0.5-$\mu\textrm{m}$ CMOS technology. The main features of the chip include maximum clock frequency of 100 MHz at 3.3-V supply voltage, 32-bit frequency tuning word resolution, 12-bit phase tuning word resolution, and an on-chip 10-bit DAC. The chip provides sinusoidal, ramp, saw-tooth, and random waveforms with phase and frequency modulation, and power-down function. At 100-MHz clock frequency, the chip covers a bandwidth from dc to 35 MHz in 0.0233-Hz frequency steps with 190-ns frequency switching speed. The complete chip occupies 12-mm$^2$die area and dissipates 0.4 W at 100-MHz clock frequency.

• 한국산업융합학회 논문집
• /
• 제4권2호
• /
• pp.127-132
• /
• 2001

In turning, the chip may be produced in the form of continuous chip or discontinuous chip. The continuous chips are dangerous to the operator and difficult to be handled at high speed machining. The signal of AE(Acoustic Emission) is found out to be related to cutting conditions, tool materials, test conditions and tool geometry in turning. In this study, the relationship between AE signal and chip form was experimentally investigated. The experimental results show that the types of chip form are possible to be classified from the AE signal using fuzzy logic.