• 대한기계학회논문집A
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• 제32권11호
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• pp.1035-1040
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• 2008

Replacement period for vehicle cabin filter of most automobiles is fixed without consideration of conditions of filter and environment. Auto alarm system of replacement period at vehicle cabin filter and interception system of high concentration dust were developed. Control program which is related with the AQS has been developed based on the circuit drive algorithm. This system is expected to be beneficial to passenger's health and to extend the life of the filter which regulates vehicle HVAC system by ventilation mode change at the time of high concentration dust.

• 대한기계학회논문집A
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• 제35권7호
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• pp.709-715
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• 2011

로봇 머니퓰레이터의 정밀한 제어를 위하여 하모닉 드라이브와 조인트 토크센서가 널리 사용되고 있다. 하모닉 드라이브는 구조적 특징으로 인하여 토크리플을 발생시키는데, 토크센서와 하모닉 드라이브가 직결된 경우에 토크리플은 토크센서에 전달되어 토크센서를 사용하는 제어기나 관측기의 성능을 저해한다. 본 논문에서는 토크리플과 하모닉 드라이브 속도의 관계를 도출하고, 이를 토대로 토크리플을 효과적으로 감쇄시키는 스위칭 노치필터를 제안한다. 제안된 스위칭 노치필터는 기존에 제시되었던 이론에 비하여 직관적이고, 추가적인 회로부나 기구부 구성이 필요 없으며, 연산량이 적은 장점이 있다. 또한 다양한 실험을 통하여 스위칭 노치필터의 필터링 성능, 빠른 응답속도와 스위칭 안정성을 검증하였다.

• Transactions on Control, Automation and Systems Engineering
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• 제2권4호
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• pp.235-243
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• 2000

The probabilistic data association filter(PDAF) is known to provide better tracking performance than the standard Kalman filter(KF) in a cluttered environment. In this paper, the stability of the PDAF of Fortmann et al[7], in the presence of uncertainties with regard to the origin of measurement, is investigated. The modified Riccati equation derived by approximating two random terms with their expectations is used to prove the stability of the PDAF. A new Lyapunov function based approach, which is different from the quantitative evaluation of Li and Bar-Shalom[7], is pursued. With the assumption that the system and observation noises are bounded, specific tracking error bounds are established.

• Korean Chemical Engineering Research
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• 제46권2호
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• pp.397-401
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• 2008

레이저 애블레이션에 의해서 가지상 구조체 형상인 나노입자 응집체를 합성하였다. 기존 마이크론 금속섬유 필터의 표면상에 나노입자 응집체를 고착하여 여과성능을 향상시켰다. 에어로졸 상에서 소결 처리된 나노입자 응집체를 증착한 후 열처리를 하여 나노구조체가 표면상에 형성된 소결 처리된 나노입자 응집체 고착 필터를 제작하였다. 소결 온도가 증가할수록 마이크론 금속섬유 필터 표면상에 고착된 나노입자 응집체의 표면적 증가로 인하여 차압은 조금 증가하지만 여과효율은 현저하게 증가하였다.

• 대한기계학회논문집B
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• 제24권6호
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• pp.760-768
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• 2000

Filter efficiency of electrically charged particle in uncharged fibrous filter was measured. In previous studies, the effect of charged particle on filter efficiency was investigated but there was difficulty in measuring of image effect that is appeared at the charged small particle. We could easily measure the image effect with charging small particles by photoelectric charging. The spark discharge aerosol generator and a differential mobility analyzer (DMA) were used to generate sub-micron monodisperse particles (${\leq}200$ nm). The generated particles were charged in photoelectric charging process using ultraviolet lamp and electric field. The filter efficiency of the charged particles, classified by another DMA, was measured in filter tester using a condensation nucleus counter (CNC) as function of particle diameter, particle charge and airflow velocity. It is shown that the filter efficiency increases with increasing charge number of the particle and is affected by particle size and flow velocity. Single fiber filter efficiency mainly depends on image force parameter and peclet number. The peclet number was not considered at previous other papers. We propose a modi fied experimental correlation as function of image force parameter and peclet number.

• 한국입자에어로졸학회지
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• 제12권4호
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• pp.151-159
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• 2016

Since airborne viruses have been known to aggravate indoor air quality, studies on development of anti-viral air filter increase recently. In this study, a mass aerosol particle generator for coating a commercial air filter (over $300{\times}300mm^2$) was built, and evaluated by comparing a commercial particle generator. Then, via this device, a commercial air filter was coated with anti-viral material ($SiO_2-Ag$ nanoparticles in this study), so fabrication of commercial anti-viral air filter was performed and the pressure drop, filtration efficiency, and anti-viral ability of the filter were evaluated against aerosolized bacteriophage MS2 in a continuous air flow condition. The result showed that the particle generation of the new generator was more than about 8.5 times over which of the commercial one. Consequently, $SiO_2-Ag$ particle coating on a filter does not have significant effects on the filtration efficiency and pressure drop with different areas, and the average anti-viral efficiency of the $SiO_2-Ag$ filter was about 92% when the coating areal density was $1.0{\times}10^{12}particles/m^2$.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 추계학술대회 논문집
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• pp.195-196
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• 2006

• 소음진동
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• 제2권2호
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• pp.135-140
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• 1992

The Extended Kalman Filter(EKF) algorithm estimates variables and unknown parameters simultaneously and is applied to parameter identification of linear and nonlinear mechanical systems. In this paper, an EKF algorithm was developed through a computer simulation and then applied to a sealing test system as a practical example. Comparing with the frequency domain analysis, it was proved to be a useful alternative for the parameter identification.

• 대한기계학회논문집B
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• 제39권11호
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• pp.885-890
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• 2015

나노물질은 작은 크기와 공기필터 응용장치의 초고표면적과 함께 기계적, 물리적, 화학적 특성을 가진다. 전기방사는 나노섬유 중합체를 제조하는데 있어 가장 효율적인 기술로 인식되어왔다. 최적의 제조 조건을 찾기 위해, 여러 전기방사 공정 파라미터의 효과에 따른 폴리아크릴로니트릴(PAN) 나노섬유의 직경, 성향 및 분포를 분석했다. 층간파괴 인성 향상시키고 히트롤러로 적층된 부직포의 형태로 박리를 억제하고, PAN 나노섬유 공기필터의 여과효율과 압력강하 성능을 실험적으로 평가하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 A
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• pp.566-567
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• 2002

In this study, the measurement part in which the Fast Fourier Transform module and orthogonal filter are included is proposed. Protection relay should has a high precision and concurrently real-time response. Because FFT routine give micro-processor heavy burden and orthogonal filter reduces precision, both FFT module and orthogonal filter are designed to have different sampling frequency.