• Journal of Sasang Constitutional Medicine
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• v.19 no.2
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• pp.113-126
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• 2007

1. Objectives The objective of this study was to measure the differences of EEG changes accoring to emotional stimulus in Sasangin. 2. Methods 44 healthy volunteers(Soyangin 10, Soeumin 14, Taeumin 20) were participated. Sasang Constitution was diagnosed by Sasang specialist. Volunteers watched horror movie as the emotional stimulus. We recorded EEG data during pre-stimulus rest(120sec), during-stimulus(197sec), rest-stimulus(120sec). Power spectral analysis was done and relitive power and ${\alpha}/{\beta}$ ratio were compared among each groups. 3. Results (1) The mean of relative ${\alpha}$ of Taeumin was significantly decreased according to stimulus compared with Soyagnin. (2) Relative ${\alpha}$ of Soeumin was significantly decreased in T3 area according to stimulus compared with Taeumin. (3) Relative ${\beta}$ of Taeumin group was significantly increased in Fp2 area according to stimulus compared with Soeumin. 4) Relative $high-{\beta}$ of Soyangin group was significantly decreased in F3 by the post-stimulus rest compared with Soeumin. (5) ${\alpha}/{\beta}$ ratio of Soeumin was significantly increased according to stimulus compared with other groups. 4. Conclusions Soyangin showed sensitive changes according to the emotional simulus compared with Soeumin and Taeumin. Above results suggest that the emotional characteristics of Sasangin can be measured by objective methods as by EEG.

• Journal of the Korea Society for Simulation
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• v.17 no.4
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• pp.1-9
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• 2008

Proposed in the paper is an automated procedure to construct a plant model for PLC simulation. Since PLC programs only contain the control logic without the information on the plant model, it is necessary to build the corresponding plant model to perform simulation. Conventionally, a plant model for PLC simulation has been constructed manually, and it requires much efforts as well as the in-depth knowledge of simulation. As a remedy for the problem, we propose an automated procedure to generate a plant model from the symbol table of a PLC program. To do so, we propose a naming rule for PLC symbols so that the symbol names include enough information on the plant model. By analyzing such symbol names, we extract a plant model automatically. The proposed methodology has been implemented, and test runs were made.

• Food Science of Animal Resources
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• v.34 no.6
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• pp.777-783
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• 2014

This study investigated the effect of various freezing and thawing techniques on the quality of beef. Meat samples were frozen using natural convection freezing (NF), individual quick freezing (IQF), or cryogenic freezing (CF) techniques, followed by natural convection thawing (NCT) or running water thawing (RT). The meat was frozen until the core temperature reached $-12^{\circ}C$ and then stored at $-24^{\circ}C$, followed by thawing until the temperature reached $5^{\circ}C$. Quality parameters, such as the pH, water binding properties, CIE color, shear force, and microstructure of the beef were elucidated. Although the freezing and thawing combinations did not cause remarkable changes in the quality parameters, rapid freezing, in the order of CF, IQF, and NF, was found to minimize the quality deterioration. In the case of thawing methods, NCT was better than RT and the meat quality was influence on the thawing temperature rather than the thawing rate. Although the microstructure of the frozen beef exhibited an excessive loss of integrity after the freezing and thawing, it did not cause any remarkable change in the beef quality. Taken together, these results demonstrate that CF and NCT form the best combination for beef processing; however, IQF and NCT may have practical applications in the frozen food industry.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.705-705
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• 2013

CIGS 박막태양 전지는 I-III-VI Chalcopyrite 결정구조를 가진 화합물 반도체 태양전지로 인위적인 밴드갭 조작을 통하여 효율 향상에 용이하다. 4원소 화합물인 CIGS 광흡수층의 대표적인제조 방법으로는 co-evaporation 공정법이 있다. 동시 증발법은 CIGS 결정을 최적화하기 위하여 박막이 증착되는 동안 기판의 온도를 3단계로 변화시켜주는 3-stage 공정을 통하여 제작된다. 일반적으로 CIGS 박막태양전지는 전면전극으로 투명전도막이 사용되며 높은 광투과성과 전기전도성을 가져야 한다. 투명전도막의 광학적, 전기적 특성은 CIGS 박막태양전지의 효율에 영향을 미치기 때문에 최적화된 조건이 요구된다. 본 연구에서는 CIGS 광흡수층은 Ga/(In+Ga)=0.31, Cu/(In+Ga)=0.86으로 최적화 시켰으며, 투명전도막은 Ga이 도핑된 ZnO박막을 RF 마그네트론 스퍼터링법을 이용하여 증착하였다. CIGS 박막 태양전지 직렬저항 성분인 투명 전도막의 비저항이 $4.46{\times}{\square}10{\square}-3{\square}$(${\Omega}$-cm)에서 $9.3{\times}{\square}0{\square}-4{\square}$(${\Omega}$-cm) 으로 변화함에 따라 Efficiency가 9.67%에서 16.47%으로 증가하였으며, Voc가 508 mV에서 596 mV으로, Jsc가 29.27 mA/$cm^2$에서 37.84 mA/$cm^2$으로, FF factor가 64.99%에서 72.96%로 증가하였다. 이에 따른 투명 전도막의 전기적, 광학적 특성을 통해 CIGS 박막태양전지에 미치는 영향에 대해 조사하였다.

• Ocean and Polar Research
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• v.42 no.1
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• pp.33-47
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• 2020

The bulk and partition geochemistry was studied in two sediment cores collected from the axial valley of the north-central Fonualei Rift and Spreading Center (FRSC), Lau back-arc Basin, southwest Pacific. The sediments consist of mostly volcanic ash, although minor amounts of biogenic and other components were present in some intervals. The major element composition of bulk sediments recalculated to a carbonate-free basis was in good agreement with the magma compositions of the adjacent Tofua Arc and the FRSC, with only significant difference in Mn content. The enrichment of Mn and other associated elements (e.g. Cu, Co, Ni, and P) is attributed to hydrothermal input to the sediments, as evidenced by their significant partitioning in the non-detrital phases according to the partition geochemistry. Hydrogenetic and diagenetic inputs were assessed to be relatively insignificant. Estimated hydrothermal Mn fluxes during the Holocene ranged between 5.0 and 37.1 mg cm^-2 kyr^-1, with the higher values in younger sediments, suggesting enhanced hydrothermal activity. The hydrothermal Mn fluxes comparable to or higher than those reported from other spreading centers with strong hydrothermal activities may indicate the presence of unknown hydrothermal vent sites and/or topographic restriction on the dispersal of hydrothermal plumes in the northern part of the FRSC.

• Journal of The Korean Society of Agricultural Engineers
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• v.59 no.1
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• pp.97-107
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• 2017

In this study, the validity and applicability of the multipurpose fishway which has been constructed for the upstream migration of fish at Chuksan river in Uljin is assessed and analyzed by a commercial software. The upper slab types of fishway in this investigation are reinforced concrete slab (S1 type) and reinforced concrete slab with steel plate (S2 type). The three different sizes of subway passage ($0.8m{\times}0.1m$, $0.8m{\times}0.2m$, $0.8 m{\times}0.3m$) and velocities (0.6 m/s, 1.2 m/s, 1.8 m/s) of Chuksan fishway was investigated and compared for the Chuksan in government design code. The analysis showed that the maximum stress and bending moment of S1 type decreased 1~21 % and 12~27 % compared to the Chuksan in government design code, respectively. Also, the maximum stress of and bending moment of S2 type decreased 11~32 % and 27~39 %. From the numerical analysis, it was found that the S2 type was greatly effective and the subway passage size of $0.8m{\times}0.2m$ was most safe. This result can be utilized to be the basic data for design of the Multipurpose fishway.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.39 no.8
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• pp.46-51
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• 2002

A new interleaved synchronous mirror delay(SMD) is proposed in order to reduce the circuit size and the power. The conventional interleaved SMD has multiple pairs of forward delay array(FDA) and backward delay away(BDA) in order to reduce the jitter. The proposed interleaved SMD. requires one FDA and one BDA by changing the position of multiplexer. Moreover, the proposed interleaved SMD solves the polarity problem with just one extra inverter. Simulation results show that about 30% power reduction and 40% area reduction are achieved in the proposed interleaved SMD. All circuit simulations and implementations are based on a 0.25um two-metal CMOS technology.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.26 no.12
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• pp.1044-1049
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• 2015

In this paper, isolation enhanced antenna using isolating resonator was proposed. Two loop type antennas were designed to operate at Wi-Fi band(2.4~2.5 GHz), in symmetry to the center, and are closely located to each other. In order to enhance isolation characteristics at Wi-Fi bands, isolating resonator was designed between the two loop type antennas. The proposed isolating resonator is a slot type antenna that enhances isolation with the control of the size, and by adjusting the value of capacitor($C_D$) the resonant frequency of the isolating resonator can easily be adjusted to enhance isolation characteristic at the target frequency.

• Aerospace Engineering and Technology
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• v.5 no.2
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• pp.1-7
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• 2006

This paper presents a new point navigation guidance law which is useful for unmanned helicopters. Predicting the future position, the guidance law generates velocity and heading commands, which are used as input to autopilot. This method differs from conventional guidance law in that it reorients the direction of flight velocity vector directly, not by bank angle indirectly. For flight tests, we have developed a flight control system for a R/C helicopters. The system consists of a flight control computer, navigation sensors, and a ground station The results of the test show that the proposed law guides a unmanned helicopter along a line path within a given area. In the future, we are planning to extend the guidance law to the mission of path following. i.e., waypoint navigation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.941-944
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• 2015

In this paper study for VSAT(very small aperture terminal) LNB(low noise block). ship LNB was demanded high stability and low noise figure. We designed FEM(Front-End Module) that was operated multi-band. FEM designed was constructed in a multi-band low noise receiver amplifier, a frequency converter, IF amplifier, Voltage Control Oscillator signal generating circuit four circuit using. To convert the multi-band 2.05GHz band, it generates four local oscillator signals, the four(band1, band2, band3, band4) designed to output an IF signal developed conversion apparatus, the conversion gain 64dB, noise figure 1dB or less, output P1dB 15dBm or more, phase noise showed -73dBc@100Hz.