• Proceedings of the KIEE Conference
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• 2007.11c
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• pp.77-82
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• 2007

In this paper, we described a design and implementation of a sensor node for environmental monitoring. The main focus of design for sensor nodes is to isolate MCU for treating sensors from the RF module for considering various communication environment. The second is to make the interface between MCU and varity of sensor. In addition, we choose a narrow band communication module, cc1020, for the admittance of Korea government comminication law. We also use a uC/OS-II as an operating system which is famous for 8bit MCUs. We showed that the communication performance is sufficient to use the communication module in a out-door environment through several experiments in that it is possible to transmit between loom distance through experiments in a mountain.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.6A
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• pp.862-869
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• 2000

In a switch routing system, buffers are indispensible to prevent signal collision during routing process. For a photonic switching system, optical buffers are also indispensible if the system requires an active routing rather than a simple optical cross-connect(OXC). To cope with WDM technologies in optical comminication systems in these days, photonic switching system also has to deal with WDM signals. Therefore, optical buffers needed in a switching system has to be routed to the same output. For the receiver to recognize these signals separately, parallel WDM signals during rearrangement process. In this paper, we propose a novel all optical WDM output buffer whose structure, hardware, SNR and BER characteristics are improved a lot comparing with those of previously reported ones. From the analysis of the proposed buffer, the new buffer can hold 255 WDM cells keeping BER of 10-9 as long as a contrast ratio(gain on-off ratio) of optical gate(semiconductor optical amplifier) nside the buffer is 30dB.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.8
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• pp.121-127
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• 2008

This paper presents an electric field distribution in a reverberation chamber using cylindrical diffuser. The characteristics of electric field distributions are compared with QRD(Quadratic Residue Diffuser) and cylindrical diffuser for $1{\sim}3$ GHz frequency band. The FDTD(Finite-Difference Time-Domain) method is used to analyze the field characteristics, and the field uniformity. At 2 GHz, the standard deviation and the tolerance of test volume in the reverberation chamber are improved by 0.11 dB, 0.43 dB for the case of cylindrical diffuser. The field strength is increased by 43.2 dBmV/m vs QRD's of 36.6 dBmV/m. Comparing with QRD's, the characteristic of polarization is also improved. These results show that reverberation chamber using cylindrical diffuser can be used alternative facility for measurement of electromagnetic interference and immunity.

• Proceedings of the Korea Contents Association Conference
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• 2018.05a
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• pp.189-190
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• 2018

Digital content requires the concept and structure that give us insights into the languages between computers and humans and how humans experience manifested among the flow of characters, images, and voice. Communicology, $Vil{\acute{e}}m$ Flusser's original study, allows us to reconsider and to reconstruct the boundary of human awareness. This paper intends to begin understanding digital content consisting of numerical codes by reviewing communicology. communicology helps to break up pre-existing categories and thinking about new standards. ith the help of information technology. Planning content can be actualized by classifying and reconstructing content that are input/output of senses. The standard of classification is 'boundary' and 'direction,' communication elements that cannot be broken down any further. There is no need to communicate if there is no boundary. The operation of communication is comprised of 'direction.' Considering humankind as the standard, the boundary that takes in stimulation from outside can be seen as senses. Direction can be expressed as input/output. Output assumes that technical pictures receive information. The coordinates for various pre-existing platforms and content and uncovered platforms can be set with a consistent standard. This allows us to escape from the standard of flat content that was activated by sight and rationality at the ideology of characters, to seek a three-dimensional standard that can be vitalized by various senses and irrationality, and to reconstruct the input/output of senses to show the possibility of planning a new platform.

• (The)Study of the Eastern Classic
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• no.36
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• pp.301-332
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• 2009

The 16 century Yulgok had lived have been evaluated as the golden age of Seonglihak(性理學) in Korea. However, on the contrary, excessively desperate was the real social and political situation which Yulgok had descirbed. Therefore, eventhhough the Seonglihak centered-reseach is meaningful, this research had the limitation in analyzing the politics in those times. In studying Yulgok's thought, the established researches had focused on philosophic theory centered-orientation. However escaping from that orientation, in this essay I try to restructure Yulgok's enlivened political experience that he had worldly seen, felt, heard and performed in 16th's real politics. While the established researches had absorbed in Kyeonghak(經學, the interpretaion of Confucian Cannon), I try to restore Kyeongse(經世, governing and managing the state) based on Yulgok's worldly political experience. The major concept on which I have focused is Pye(弊, the abnoxious custiom in political and official sphere). Yulgok's offical life had begun with the problematic of how to overcome Pye inherited by Kwongan(權奸, a politically villainous retainer). In the process, he had focused on the worldly performable issue, Minsaeng(民生, the livelihood of the people), not on the abstract and theoritical concept, Min(民, the people). He recognized the cause of desperate situation had resulted from Pyebeob(弊法, the obnoxious law, its system and its execution), and tried to reform Pyebeob in the various way. The next concern of Yulgok came to Pyejeong(弊政, the obnoxious politics, its system and its execution), which interrupted not to reform Pyebeob. According to Yulgok, Pyejeong resulted from the wrong fulfilment of official-scholar elite in government, and the distorted public opinion in governemt. This fact demonstrates two elements mentioned above had common root of the absence of communication of public opinion. Yulgok recognized the importance of Ui(議, the discussion) than of Ron(論, the dabate) and then reviving Ui, Yulgok had tried to arrange the foundation for the communication of public opinion in political sphere.