• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.897-898
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• 2014

줄넘기는 오래전부터 건강운동과 미용체조의 일환으로 일반에게 널리 사용되고 있다. 최근에는 줄넘기의 손잡이와 줄에 다양한 기능을 부가하여 손잡이에 줄을 넘은 횟수를 카운트하여 표시해 주거나, 스피커를 구비하여 음성출력을 부가하거나, 줄의 재질 및 형태도 다양화하여 줄의 무게를 조절할 수 있는 기능을 부가하고 있다. 본 논문에서는 운동하는 사람의 정보를 기반으로 적절한 운동량을 조절하도록 사용자의 줄넘기 횟수 및 운동 시간 등을 스마트폰으로 전송할 수 있는 스마트 줄넘기 모듈을 블루투스(bluetooth) 기반으로 개발하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.1421-1424
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• 2013

본 논문은 진공을 이용한 흡착방식과 바퀴형 이동방식을 이용하고 환경 탐지용 센서를 부착한 벽면 이동형 로봇의 구현에 관한 연구로서, 대형 구조물의 안전 검사 및 위험한 시설물의 보수 작업등을 보조하기 위한 목적이 있다. 로봇의 무게에 따른 중력을 견딜 수 있도록 강력한 진공흡착방식을 고안하여 다양한 벽면재질에도 견딜 수 있도록 설계하였으며, 바퀴형 이동방식을 택하여 높은 이동성과 제어 능력을 고려하였다. 벽면의 모서리를 이동하기 위해 이중 벽로봇 구조와 모서리 극복 이동 메카니즘을 제안하였으며 또한 환경 감지를 위한 카메라를 부착하여 시각정보 등 유용한 정보를 관리자와 통신을 통해 교환할 수 있도록 하여 지능능력과 활용성을 갖추었다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.253-256
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• 2011

본 논문은 진공흡착방식과 바퀴형 이동방식을 이용한 벽면이동형 지능로봇의 구현에 관한 연구로서, 대형 구조물의 검사 및 위험한 시설물의 보수 작업등에 사람을 대신하여 활용하는데 그 목적이 있다. 로봇의 무게에 따른 중력을 견딜수 있도록 강력한 진공흡착방식을 고안하여 불규칙한 벽면재질에도 견딜 수 있도록 설계하였으며, 바퀴형 이동방식을 택하여 이동을 위한 구조가 단순하고 제어 능력이 뛰어나다. 또한 환경 감지용 센서와 시각정보를 관리자와 통신을 통해 교환할 수 있도록 하여 지능능력과 활용성을 갖추도록 하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2024.01a
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• pp.297-298
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• 2024

펜데믹, 전쟁 등을 포함한 국제 정세 변화에 따른 물류대란, 원자재가격 상승 및 환율 급등으로 인해 2023년 기준 대한민국의 물가는 크게 오르고 있는 추세이다. 물가 상승은 사업장의 인건비 부담 증가로 이어지고 있고 특히 노동 집약 산업인 농업 분야에서의 인건비 부담 문제는 더욱 심각한 실정이다. 외국인 근로자 고용이 대안이 될 수 있지만 인건비 절감 효과는 미미하기에 농업계 관계자들은 자동화 시스템 도입에 관심이 집중되고 있다. 따라서, 본 논문에서는 사과 분류 작업 자동화 체계의 핵심 요소에 해당하는 사과 품질 실시간 모니터링 시스템을 제안한다. 제안한 방식에서는 딥러닝 기반의 영상 분석 기법 및 무게 센서 데이터 분석을 통해 사과의 품질에 따른 등급 책정을 자동화 한다.

• Journal of the Korea Society of Computer and Information
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• v.17 no.8
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• pp.107-114
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• 2012

We have developed a textile capacitive pressure sensor for smart gait analysis. The proposed system can convert sensor signal into step counts and pressure levels by different posture. To evaluate the performance of insole type textile capacitive sensor, we measured capacitance change by increment of weights from 10 kg to 100 kg with 10 kg increment using M1 class rectangular weights (four 20 kg weights and two 10 kg weights) which have ${\pm}10%$ tolerance. The result showed non-linearity characteristic of a general capacitive pressure sensor. The test was performed according to a test protocol for four different postures (sitting, standing, standing on a left leg and standing on a right leg) and different walking speeds (1 km/h and 4 km/h). Five healthy male subjects were participated in each test. As we expected, the pressure level was changed by pressure distribution according to posture. Also, developed textile pressure sensor showed higher recognition rate (average 98.06 %) than commercial pedometer at all walking speed. Therefore, the proposed step counts and posture monitoring system using conductive textile capacitive pressure sensor proved to be a reliable and useful tool for monitoring gait parameters.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.8
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• pp.5534-5540
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• 2015

This In the railway signaling system, applications of axle counter in addition to track circuit goes on increasing for detecting train position. Consequently, this paper compares sensor methods of axle counter with between geo-magnetism method and proximity sensor method. And it presents differences and results, to improve reliabilities of train detection and axle counting. Also, this article presents an applied result which is based on field experience, with regard to installation, considering attachment condition of sensor part for accurate axle counting. This study acquires expandability that is able to perform not only axle counting function but also various other functions (direction detection of train, speed detection of train, and so on). It was a result of a change of design in order to judge phase difference of sensors, to improve reliability of axle counting. Furthermore, it does not subordinate to characteristics (type, weight of train). And it is confirmed that the omission of axle counting was not occurred in 350km/h. This was the result of Lab test after the construction of transfer equipment of trial axle and Test Bed for axle counting. Both of them are self-productions. Through this, it prepares foundation which is able to apply not only to train detection but also to speed of passing trains, formation number of trains, detector locking condition - when the train passes the section of switch point, and level crossing devices. Furthermore, it would be judged to contribute safety train operation if proximity sensor method applies to the whole railway signaling system from now on.

• Journal of Korea Society of Industrial Information Systems
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• v.22 no.5
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• pp.31-37
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• 2017

In this Paper, we have Improved the Manufacturing Process of Liquid Aluminum Sulfate using the Design of Automated Measurement Systems. The Manufacturing Process of Liquid Aluminum Sulfate uses a Large Weight. The Quality of a Product Depends Highly on the Proportion of the Raw Material Input in the Production Process. Therefore, it is Very Important to Accurately Measure the Amount of Raw Material. For Automation Design, Load Cell Sensor which can Measure Large Weight Accurately and PLC Technology which is most used in Automation Process are Applied. The Content of Aluminum Oxide in the Aluminum Sulfate Produced before the Automation Design Varies from 8.023% to 8.250%. However, after Automation Design, the Amount of Change from 8.09% to 8.19% was Greatly Reduced. As a Result, we could Reduce the Quality Defect rate Due to Weighing Errors and Reduce Safety Accidents by Applying Automation System.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.9
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• pp.233-239
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• 2019

An unmanned underwater vehicle is a major weapon system that allows surveillance and reconnaissance missions in border areas or threatening areas where enemy submarines are present. Unmanned underwater vehicles can be used to explore underwater resources, predict disasters, and survey the topography of the ocean floor in the civilian fields, while in the defense fields, it can be used for anti-submarine reconnaissance and mine countermeasures. In this paper, we first investigate the main classification of unmanned underwater vehicles, and foreign R&D trends are analyzed based on the main classification criteria by weight, such as portable, light, heavy and large-scale unmanned underwater vehicles. Then we examine the trends in the development of domestic unmanned underwater vehicles. Finally, through the analysis of both domestic and foreign unmanned underwater vehicles, we present future development trends of unmanned underwater vehicles in order to set defense goals to counter the anticipated threats and diversified potential environment.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.21 no.3
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• pp.123-128
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• 2021

For accurate speed and current control in industrial applications, SRM (Switched Reluctance Motor) is very important to synchronize the stator phase excitation and rotor position in the drive due to its nature. In general, position sensors such as encoder and resolver are used to generate rotational force by exciting the stator winding according to the rotor position and to control the motor by using speed and position information. However, for these sensors, 1) the cost of the sensors is quite large in terms of price, so the proportion of the motor system to the total system cost is high. 2) In terms of mechanical, position sensors such as encoders and resolvers are attached to the stator to increase the size and weight. In conclusion, in order to drive the SRM, control based on the rotor position information should be basically performed, and it is important to design the SRM driving system according to the environment in consideration of the application field. Therefore, in this paper, we intend to study the driving and control characteristics of SRM through variable switching duty control by designing a low-cost analog driving device, deviating from the general control system using the conventional encoder and resolver.

• Journal of the Korea Convergence Society
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• v.13 no.3
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• pp.125-131
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• 2022

Recently, the prevalence of remotely managed patient care systems in medical institutions is increasing due to COVID-19. In particular, in the case of fluid monitoring, hospitals are considering introducing it as a system that can reduce patient safety and nurses' work. There are two products under development: a load cell method that measures weight and a method that detects drops of sap by infrared sensing. Although each product has differences in operation principle, sensor type, size, usage, and price, medical institutions are highly interested in the accuracy of the data obtained.In this study, two prototypes with different sensor methods were manufactured and the total amount of infusion per hour was measured to test the accuracy, which is the core of the infusion monitoring device. In addition, when there was an external movement, the change in the measured value of the sap was tested to evaluate the accuracy according to the measurement method. As a result of the experiment, there was a difference of less than 5% in the measurement value error of the two devices, and the load cell method showed a difference in the low-capacity measurement value and the infrared method in the high-capacity measurement value. As a result of this experiment, there was little difference in accuracy according to the sensor method of the infusion monitoring device, and it is considered that there is no problem in accuracy when used in a medical institution.