• Proceedings of the SAREK Conference
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• 2005.11a
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• pp.523-525
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• 2005

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2000.11c
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• pp.819-826
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• 2000

This study was performed to develop a measurement system of tractor field performance for plow and rotary operations. Measurement system for tractor consisted of torque sensors to measure torque of drive axles and PTO axle, speed sensors to measure rotational speed of drive axles and engine, microcomputer to control data logger, and data logger as I/O interface system. The measurement system was installed on four-wheel-drive tractor. Four-element full-bridge type strain gages were used for torque measurement of drive axles and optical encoders were used to measure speeds of drive axles and engine. Slip rings were mounted on the rotational axles. Signals from sensors were inputted to data logger that was controlled by microcomputer with parallel communication. Sensors were calibrated before the field tests. Regression equations were found on completion of the calibrations. The field experiment was performed at paddy fields and uplands. Rotary and plow were used when the tractor was operated in the field. Travelling speeds of the tractor were 1.9 km/h, 2.7 km/h, 3.7 km/h, 5.5 km/h, 8.2 km/h, and 11.8 km/h. Operating depths of implements were maintained approximately 20cm during the tests. Torque data of drive axles were different at each location during plow and rotary operations. Results showed that torque of rear axles were greater than those of front axles. Total torque were 6860 - 11064 Nm at the upland and 7360 - 14190 Nm at the paddy field for plow operations. It was found that torque at the paddy field were about 20% greater than those at the upland for plow operations. Torque data showed that rotary operations required less power than plow operation at the paddy field and the upland. Torque measurements at each axle for rotary operations were only 8 - 16% of plow operations in the upland and 15 - 20% in the paddy field.

• Proceedings of the KIEE Conference
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• 2003.11c
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• pp.731-734
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• 2003

In present, most of metallic structures(gas pipeline, oil pipeline, water pipeline, etc) are running parallel with subway and power line in seoul. Moreover subway system and power line make a stray current due to electrical corrosion on metallic structures. The owner of metallic structures has a burden of responsibility for the protection of corrosion and the prevention against big accident such as gas explosion or soil pollution and so on. So, they have to measure and analyze the data about P/S(Pipe to Soil) potential, amplitude of stray current, point of source of stray current and so. In this paper, results of development about data logger apparatus for measurement stray current of subway and power line are presented.

• Journal of Industrial Technology
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• v.25 no.B
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• pp.165-170
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• 2005

This paper presents a development of the Data Logger System to transmit the outcome of the waterlevel measuring instrument using the pressure sensor by means of the CDMA network. In or order to set up the real time monitoring the waterlevel measurement system, we have designed the waterlevel sensor, communication terminal and repeater, and data logger. Furthermore, its application for the GIS(Geographical Information System) with management sever system and software solutions have also been developed to minimize the property damages from the flood disaster which occurs every year in the river.

• Proceedings of the KIEE Conference
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• 2002.07d
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• pp.2364-2367
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• 2002

Recently PDA(Personal Digital Assistance) can be purchased at a lower cost than ever before. Therefore, it can be effectively used in various ways such as a personal information management system and wireless mobile internet application. Manufacturers of PDA try to develope various application modules for its extensive utilizations. In this work, a CF typed GPS and data logger module for PDA is designed. It can give us valuable informations about the precise position of measuring site and corresponding sensor values. The proposed CF module can make it possible for PDA to be used as a hand-held measurement device.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.9
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• pp.1575-1583
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• 2008

Wireless sensor network has merit of low-power, low-cost and self-organization network, so there are many researches substituted for existing wire network. As structure reinforcement work need a high accuracy, many sensors are installed in structure and connected with data logger for monitoring. However this wire data logger method takes a long time to install wires and installed wires obstruct to work. Additionally, wire data logger method represent sensor data by only numeric and graph, it is not able to support a rapid decision-making for working. To resolve wiring problem and support decision-making, we designed and implemented the monitoring system based in wireless sensor network. For verifying performance, accuracy and availability, we simulated and tested our system in real field. Consequently, wireless sensor network method is easier to install and deploy than wire data logger method, user is able to monitor instinctively and overall by 3D representation of structure and sensors, and it show not only accuracy but also performance for many sensors.

• Proceedings of the ESK Conference
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• 1997.10a
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• pp.456-459
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• 1997

디자이너에게 필요한 정보가 제품의 성격이 변함에 따라 변하면서 정보 수집의 흐름도 달라져가고 있다. 지금까 지의 디자인 정보 수집이 단순 설문조사에서 사용자의 사용상황을 관찰하는 보다 실질적인조사 혹은 컨텍스트 디 자인(Context Design: 사용환경을 고려한 디자인)으로 바뀌어 가고 있다. 그러나 기존의 조사분석방법들이 특정한 면(인지적 혹은 행위적)에 편중된 자료 수집에 초점이 맞추어져 있어서 다양한 정보의 수집과 이러한 정보의 통합 적 관리가 어려운 문제점을 가지고 있다. 정보의 수집과 통합적 관리의 어려움이 발생하게 되는 원인을 좀더 구체 적으로 살펴보면 첫째, 수잡되는 데이터의 문제이다. 데이터의 성격을 사용자인 개인의 조작행위에 중점을 두거나 또는 작업상황이나 사용자의 성격/선호도와 같은 부분에 중점을 두기 때문에 서로 상호작용하여 사용자 인터페이스에 큰 영향을 미치는 이 두 유형의 데이터에 관한 분석을 어렵게 하는 원인이 되고 있다. 둘째, 적당한 데이터 수집도구 (data logger)의 미비를 들 수 있다. 이것은 기존의 Data logger들은 정보를 문자나 숫자 또는 특수문자로서 정보를 추출하게 됨으로써 데이터를 뽑는 당시부터 정보가 추출자로인하여 1차적으로 가공이 된다는 점이다. 이것은 보다 실질적이고 분석단계에서 보다 면밀한 분석이 이루어 질 수 있는 중요한 데이터가 유출될 수도 있다는 것을 의미하는 것이다. 마지막으로 위에서 언급했던 두 유형의 데이터를 동시에 분석할 수 있는 방법의 부재와 실질적인 데이터를 분석하여 이를 디자인에 활용할 수 있는 정보로 가공할 수 있는 도구가 마련되어 있지 않다는 점이다. 디자인 작업은 종합적인 시각화 과정임에 비해 분석된 결과가 비시각적이며 위에서 언급했듯이 분절된 정보가 되기 쉽기 때문에 이를 디자인에 곧바로 적용시키기 어려운 점이 있다. 이에 본 연구는 기존의 바용성 평가를 위한 분석도구들이 갖는 문제 점들 해결하여 제품의 사용자 인터페이스 디자인 개발과정에서 활용할 수 있는 평가 분석도구를 개발하는 것을 목표로 한다. 이를 위해 첫째, 다양한 유형의 정보를 포함하는 비디오 정보를 선정하였따. 둘째, 데이터를 다양한 측면에서 추출할 수 있는 Data logger를 개발하였다. 셋째, 데이터를 시각적으로 정리하고 분석할 수 있는 도구를 제안한다. 마지막으로 인터페이스 디자인에서 여러 가지 디자인안을 도출해 내는 작업에 이용할 수 있는 종합화과정을 개발한다. 이러한 일련의 과정이 통합된 컴퓨터 시스템 안에서 이루어지도록 프로그램을 개발하여 정보의 유용성을 높일 수 있도록 한다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.14 no.2
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• pp.83-88
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• 2000

A Development of a data logger for monitoring wasted water is introduced. A characteristics of the system with microcontroller are simple and cheaper. A portable RAM card is consisted for saving a monitored data. Serial communication is adopted to communicate with a remote monitoring computer. CSMA/CD, which is used widely as MAC(Medium Access Control) in ethernet, is modified to apply a RS485 serial communication. When the measured values run over a limit values, the data logger takes alarm.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.6
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• pp.1122-1128
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• 2006

In this paper, we implemented an wireless data logger system for checking gas volume data using microcontroller Atmega128. The system used wireless communication between master and slave, and operated by socket communication under TCP/IP protocol between server and client. And monitoring interface program was implemented as a software adoptable for GUI environment using Visual C++. The system is constructed server program and client program in order to display gas volume data at a real time, and is expensive, tiny, and easy in implementation. It allows the system to be useful as a pilot project for microcontroller experiment.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.11
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• pp.1121-1128
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• 2016

Our country of agriculture suffers problems such as aging, population decline, agricultural decline etc. To solve this problem, in the country, it is interest in Smart Farm System, a convenient and efficient system for the production through the convergence of ICT technology and agriculture. However, because of expensive construction costs and difficulty in securing human resources and training for Operating system, they are struggling to spread the actual farmers. Therefore, it is necessary to develop smart farm techniques suitable for such customized domestic environment. This study designed a system for collecting environment date in a greenhouse based on the low-cost embedded devices, and designed and implemented for the Web application that a user can easily use system. The implementation of the system lowers deployment costs and is expected to increase largely the spread of Smart Farm it can be easily accessed by using the smart phone.