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Performance Enhancement of a Six-bar Linkage-based Clamping Device Using a Curved Slide Joint
오주현,SangGyun Kim,서태원 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.7
A clamp is a fastening tool that is widely used in various industries. Pneumatic clamps are used in large factories to hold steel plates; however, additional equipment, such as complicated wiring and air tanks, do not allow sufficient workspace. Thus, there has been a demand for a clamping device actuated by an electric motor to simplify the system. Because an electric clamp uses a motor instead of a linear actuator, its mechanical linkage structure should be designed appropriately to improve the clamping performance and efficiency. A six-bar toggle clamp with a linear slide joint has a section in which the torque amplification ratio is maintained even when the output angle increases. However, this section can be extended by curving the slide joint. In this study, a six-bar linkage-based clamping device with a curved slide joint is proposed. A spline curve was applied at the linkage. The clamping performance of the device surpassed that of the existing six-bar linkage device, and the device exhibited a wider range of output angle while maintaining a minimum torque amplification ratio. A spline curve was constructed using six control points and optimized by comparing the performance indicators. The input and output angle relationship was calculated in addition to the torque amplification ratio according to the output angle. A test bench was constructed, and experiments were conducted to validate the simulation results.
데이터 증강을 위한 클래스 활성화 맵 기반 Random Erasing
오주현,이규중 한국멀티미디어학회 2023 멀티미디어학회논문지 Vol.26 No.10
Random erasing offers various levels of occlusion for data augmentation. However, due to its uniform distribution of random selection, it sometimes occludes regions that are unrelated to the object of interest. In this paper, we propose a novel method that utilizes Gradient Weighted Class Activation Mapping (Grad-CAM) for estimating the location of the object of interest and selectively erasing the surrounding areas. By utilizing Grad-CAM, we improve random erasing for CNN models without requiring additional modules or architectural changes. We generate Grad-CAM after the intermediate epochs where CNN models have sufficient representational power for the training data. The hyperparameter that restrict the erasing to the vicinity of the object is set based on Grad-CAM, and experiments were conducted accordingly. As a result of our experiments, we observed a 0.33% decrease in error-rate for image classification tasks using ResNet-20 on the CIFAR-10 dataset.
기침을 동반한 과민성 방광 증후군에 대한 한방 치료 1례
오주현,이유라,송진영,공건식,박진훈,김소원,강만호,이형철,엄국현,송우섭 대한한방내과학회 2020 大韓韓方內科學會誌 Vol.41 No.5
Objective: Overactive bladder syndrome refers to the symptom of frequent urination, as the function of the bladder is so sensitive that the bladder muscles contract regardless of the patient’s intent and the patient feels the need to urinate quickly. Overactive bladder syndrome is common among the elderly, especially in women, and the prevalence increases with increasing age. Overactive bladder can decrease social activity, increase isolation, and decrease quality of life due to sleep disorders caused by night urination; therefore, active treatment is required. In this study, we report the effects of Korean medical treatment on a Korean hospital patient with overactive bladder symptoms, including urine frequency, urine incontinence, and night urination that began at a similar time to an onset of coughing. Methods: We treated the patient with herbal medicines and acupuncture therapy. The International Prostate Symptom Score (IPSS), Overactive Bladder Symptom Score (OABSS), and a numeric rating scale (NRS) were used to assess symptom changes. Results: The patient with urine frequency, urine incontinence, and nocturia was hospitalized for 8 days, and the overall symptoms of overactive bladder syndrome were improved. Conclusion: The results indicate that Korean medical treatment is effective in patients with overactive bladder syndrome.