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강병모,천인국,홍인식 순천향대학교 부설 산업기술연구소 2000 순천향 산업기술연구소논문집 Vol.6 No.1
We have developed PCB pattern inspection system using CCD camera for detecting PCB pattern defects. There are two main techniques in detecting PCB defects: image differencing and design-rule verification. In this paper, we use image differencing method. We separate object and background using color segmentation method. We use sobel operator to find edges, and using the edges register reference image and test image. The proposed method provides reduced cost, fast inspection speed, efficient performance, flexibities.
Serum allergen-specific and total IgE concentrations in dogs with allergic disorders in South Korea
Byoung-Gook Yoon,Han-Joon Lee,Kun-Ho Song 한국동물위생학회 2023 韓國家畜衛生學會誌 Vol.46 No.3
Canine atopic dermatitis (CAD) has a genetic basis and is primarily a skin disorder characterized by allergic features. It is caused by an excessive immune response, associated with immunoglobulin E (IgE), to allergens and shows clinical signs of itching and inflammation. The present study evaluated the allergen-specific and total IgE concentration in dogs with allergic disorders. Allergen-specific IgE analysis was performed using a Multiple Allergen Simultaneous Test (MAST) assay, and total IgE analysis was conducted using an ELISA in 82 dogs with CAD. The subjects were divided into two groups: dogs aged ≤3 years and dogs aged >3 years, enabling a comparison of total IgE concentrations between the two age groups. The results showed that the major affecting environmental allergen was Alternaria alternate , and the major affecting dietary allergen was raw chestnut. The results revealed that dogs aged ≤3 years had higher total IgE concentrations than dogs aged >3 years with significant difference. The results of this study can contribute to the diagnosis and treatment of CAD in South Korea.
사물인터넷 기반 초미세먼지(PM2.5) 측정 장치 개발
노병국 ( Byoung Gook Loh ),최기흥 ( Gi Heung Choi ) 한국안전학회(구 한국산업안전학회) 2017 한국안전학회지 Vol.32 No.1
An IoT-based particulate matter (PM2.5) sensing device (PSD) is developed. The PSD consists of a PM2.5 sensor, signal processing circuit, and wi-fi enabled-microprocessor along with temperature and humidity sensors. The PSD estimates PM2.5 density by measuring light scattered by PM2.5. To gauge performance of the PSD, PM2.5 density of open air was measured with the PSD and compared with that of the collocated-government-certified measuring station. Measurements were taken at a sampling frequency of 100 Hz and moving-averaged to remove measurement noise. When compared to the result of the measuring station, average percentile error of PM2.5 density from the PSD is found to be 31%. A correlation coefficient is found to be 0.72 which indicates a strong correlation. Instantaneous variation, however, may far exceed average errors, leading to a conclusion that the PSD is more suitable for estimating average trend of PM2.5 density variations than estimating instantaneous PM2.5 density.
Designing Factory Safety Monitoring Robot Using Microsoft Robotic Studio
Loh, Byoung-Gook The Korean Society of Safety 2008 International Journal of Safety Vol.7 No.1
Application of the Microsoft robotics studio (MSRS) to the design of a factory safety monitoring robot is presented. Basic structures of the MSRS and the service are introduced. The service is the key building block of the MSRS. Control of the safety monitoring robot is performed using four basic services: 1) the robot service which communicates with the embedded micro-processor and other services, 2) the sensor service that notifies the subscribing services of the change of the sensor value, 3) the motor service which controls the power levels to the motors, 4) the drive service which maneuvers the robot. With built-in capabilities of the MSRS, control of factory safety monitoring robot can be more easily performed.
Acoustic Levitation and Rotation Produced by Ultrasonic Flexural Vibration
Loh, Byoung-Gook 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.5
Acoustic levitation induced by ultrasonic flexural vibration at 28.4 KHz with a vibration amplitude of 10 micrometers is presented. Levitation of multiple objects along the length of the beam in a gap of 8.3 mm which is the half of acoustic wavelength is experimentally demonstrated. Analytical analysis predicts that levitated objects for the gap of half-the wavelength converges to the center of the gap, which is experimentally verified. It is observed that levitated objects with well-balanced mass distribution are set into rotation due to acoustic streaming. For cylinder-shaped Styrofoam with a diameter of 1.8 mm and a length of 3 mm, measured rotational velocity is 2400 revolution per minute. Applications of standing wave field levitation (SWFL) include manipulation of biological cells and blood constituents in biotechnology, and fine powder in material engineering.