• Proceedings of the KSR Conference
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• 2011.05a
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• pp.377-383
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• 2011

The paper is to perceive accurately speed of the train through redundant processor operation. When Slip/slide is occurred at the axle, the train is applied brake force using the Tachometer and the Doppler sensor which assistance equipment. One of the main features of railway signaling system is that rolling stock is made stop to avoid collision with the rolling stock ahead when the rolling stock exceeds its maximum operating speed in line. In addition, in the case of the rolling stock with automatic train operation, it carries out activities such as braking and propulsion using the difference between its actual speed and target speed at the point. To perform these functions, it is essential to calculate the exact speed of the rolling stock in signaling equipment on vehicles. Train speed detection unit are composed of the Tachometer and the Doppler sensor, and speed information is sent to the SDU unit. The processor of SDU unit calculates the speed of the train using compare logic the received speed information. Even if there are Slip/Slide, signaling system is available to apply exact braking, to improve stop on position and to guarantee the safety of trains.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.62-63
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• 2016

A variety of sensors and equipment are installed on passenger ships. Data collection from these sensors and associated equipment is required for the safe navigation and behavior analysis of ships, but when the ship sails out of the area where it is not possible to use the LTE communication, other types of networks have to be able to support to transmit these information. such as AIS, satellite communication and MF/HF. In this paper, we survey data protocol of onboard sensors and design ASM messages to transfer sensor data on board to the shore-side system.

• Korean Institute of Interior Design Journal
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• v.17 no.5
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• pp.61-71
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• 2008

The study alms to seek a plan of applying the digital technology to housing for the elderly. The purpose of the study was to grasp the needs of the aged on 30 types of digital systems in housing. The subjects were 120 persons aged of more than 60 years and lived in Busan. Data were collected by the individual interview. The following results were drawn from this study. First, the needs of the aged on the digital systems categorized as safe and security, control of indoor environment, and housework support were very high and should be provided at first. Second, the necessary types of digital systems which should be provided to the digital home for the elderly were digital systems for heating control, health checking, sensing of fire and gas leak, and house cleaning. Also, the basic types of digital systems were ones for invasion and burglarproof, emergency, air cleaning, automatic facet, door locking, and waste collecting. Third, the Income and usage level of digital equipment of the aged influenced to the floods of the aged on the digital system. Therefore, in addition to the necessary and basic types of digital systems mentioned above, the income and usage level of digital equipment should be considered in planning the digital home for the elderly.

• KEPCO Journal on Electric Power and Energy
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• v.4 no.2
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• pp.81-88
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• 2018

Performance evaluation of a plant to efficiently manage and maintain the performance of the plant is a very important procedure. However, since the conventional performance evaluation method is an Excel-based manual method, the preparation procedure is complicated and the versatility is poor. In this paper, we analyze the problems of the existing performance evaluation system, effectively model the equipment, calculate the missing physical properties, and improve the versatility, efficiency and accuracy of the performance evaluation through the equipment modeler which performs automatic index calculation based on this.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.3
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• pp.477-484
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• 2017

In the conventional recirculation fish farms, there is a lot of difficulties due to lack of professional manpower and high reliance on imported measurement equipment. In this paper, we implement an automatic water quality measurement system which can measure the pollution degree in a water tank of fish farms using an optical sensor(pH, DO) with the IoT technology. The problem with existing systems is that the fish tank should be checked by means of human, or put the measuring equipment into the water tank of fish farms and measurement directly. But, it has a bad influence on the growth of fish. In this paper, we propose a method of indirect measurement without immersing the measurement equipment in a water tank of fish farm and develop a sustainable measurement system in an environment containing salt and lots of pollutants without affecting the growth of fish within the water tank of fish farms.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.4
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• pp.100-105
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• 2016

The use of 3D scanners has increased gradually according to increasing 3D printer applications. The precision inspection of car parts or electronic components is an important issue not only in the field of mass production, but also in small-scale production. Recently, 3D scanner equipment efficiency and recognition technology has been improved continuously. On the other hand, the spraying time to prepare 3D scanning is time-consuming and has environmental problems. Therefore, an automatic spray system has been in demand by the manufacturing industry. Automatic spray equipment was newly developed for the preparation of a 3D scanner. In this research, the automatic spray system guarantees uniform spray operation. To determine the optimal spray parameters, various spraying methods, solutions and conditions were tested and compared with the experiments. The preparation time for 3D scanning was reduced to 1/10 compared to the manual spraying time, and indicates the optimal spraying conditions through a comparison of various spray coating conditions.

• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2529-2532
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• 2003

The quality of agricultural products is represented a degree of freshness and a special qualify that has a close relation to commercial value. To grade tomatoes, it used to nondestructive equipment of a charge-coupled device(CCD) camera and near-infrared(NIR) spectrum analysis method. The NIR spectrum analysis method is used to determine internal qualities such as a brix and an acidity. The CCD camera is used to measure external qualities like color and a size of tomatoes. This paper explaines the structure and movement of the automatic grade system and applies the algorithm for deformed tomtatoes and characteristics of tomatoes through image processing to the grade system.

• Journal of Drive and Control
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• v.9 no.2
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• pp.28-38
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• 2012

Monitoring of system cleanliness levels and counting of particulate contaminant are fundamental to achieving hydraulic system reliability as any departure from the specified cleanliness level is often a precursor to future failures. On-line monitoring of cleanliness levels has the advantage of giving data both very quickly and accurately as environmental influences are eliminated. In this way, corrective actions can be promptly implemented. Most on-line instruments are sensitive to system conditions to a greater or lesser extent, but Automatic Particle Counters (APCs) working on light extinction principles are especially sensitive to the presence of optical interfaces caused by such conditions as fluid mixtures, emulsions, free water and air bubbles. These conditions give erroneous data and can result in drawing incorrect conclusions, wasting maintenance time and ultimately, reduced user confidence in cleanliness monitoring. This paper describes such conditions and shows how the correct selection of the analysis technique can result in reliable cleanliness level data.

• Journal of the Speleological Society of Korea
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• no.87
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• pp.8-13
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• 2008

The automatic firewall block and fire alarm system was embodied by using gas circuit and wireless communication equipment, using a smoke sensor (ST-QA1A) and RF Module. OR-CAD was also used for testing circuit system and experiment circuit after assembling circuit. As a result in experiment, the gas sensor detected well an imaginary smoke and worked reliably for driving action of firewall block motor and wireless warning alarm. Through the smoke sensitive perception from the fire, the warning alarm and the preventing fire propagation from the specific closed region were verified reliably. The gas sensor and RF module for firewall and fire alarm system were actually available.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.20 no.2
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• pp.26-31
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• 2012

A new operational concept for the CNS/ATM using the digital data communication technology and satellite navigation system is being implemented globally and the United States is the first country to apply UAT ADS-B system for general aviation. Korea also has plan to build ADS-B system for aeronautical surveillance to monitor low altitude flight of light aircraft and ultra-light flying device and the research to develop UAT ADS-B equipment is being carried out. This paper presents the application method of UAT ADS-B to support test operation with case study of foreign UAT ADS-B operation and survey of domestic environment.