• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.1 s.343
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• pp.1-8
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• 2006

In this paper, we suggested a new antenna structure for the RFID(Radio Frequency IDentification) reader. The conventional RFID reader uses a loop antenna. The central area of a loop antenna shows a low magnetic field strength, especially for the case of a large loop antenna diameter. We proposed a parallel-fed multiple loop antenna. Simulation and measurement were carried out for a single loop antenna, series-fed and parallel-fed multiple loop antennas. Simulation results show that we can obtain 0.40A/m, 0.68A/m, 1.98A/m of magnetic field strengths at the central point of a reader antenna for a single loop antenna, series-fed and parallel-fed multiple loop antennas, respectively. We measured the $79mm{\time}48mm$ tag area averaged induced voltages with applying 20Vp-p same source signals to reader antennas through the resistors. Measured tag area averaged induced voltages at the central point of a reader antennas were 0.76V, 1.45V, 4.04V for a single loop antenna series-fed and parallel-fed multiple loop antennas, respectively. The results show that we can get high induced voltage which can grantee a longer reading distance with a proposed parallel-fed multiple loop antenna.

• Korean Journal of Computational Design and Engineering
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• v.14 no.6
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• pp.424-433
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• 2009

In order to improve productivity and efficiency of ship production process, production technology converged with Information Technology can be considered. Mid-term scheduling based on long-term schedule of ship building and execution planning based on short-term production schedule have an important role in ship production processes and techniques. However, data used in the scheduling are from the experiences of the past, cognitive, and often inaccurate, moreover the updates of the data by formatted documents are not being performed efficiently. This paper designs the tracking and monitoring system for the curved plates forming process with shop level. At first step to it, we redefine and analyze the curved plates forming process by using SysML. From the definition and analysis of the curved plates forming process, we design the system with respect to operational view considering operational environment and interactions between systems included and scenario about operation, and with respect to system view considering functionalities and interfaces of the system. In order to study the feasibility of the system designed, a prototype of the system has been implemented with 13.56 MHz RHD hardware and application software.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.5
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• pp.143-149
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• 2016

Recent accidents caused by toxic chemicals and the social problems caused by frequent. As of 2010, there are more than 100,000 types of deadly toxic chemicals being distributed throughout Korea, and severely intoxicated patients along with an enormous number of patients can be induced at the time of an accident involving deadly toxic chemicals. Internationally, the seriousness of large-scale disasters due to a NBC disaster (nuclear, biologic and chemical disaster) is being highlighted as well. So, we obtain the information of the RFID tag attached to a glass bottle with containing the toxic chemical to transfer the data to the smart device has been studied a system that can monitor the status of the toxic chemical in real time. The proposed system is the information was sent to the main system using a zigbee communication by recognizing the tag vial containing the toxic chemical with the 13.56MHz bandwidths good permeability. User may check the information in real time by utilizing the smart device. However, the error of the system for managing the toxic chemical generates a result that can not be predicted. Failure of the system was detecting the error by using a comparator as this can cause an error. And the detected error proposed a duplex system so that they do not affect the overall system.