• The Korean Journal of Food And Nutrition
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• v.13 no.3
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• pp.226-234
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• 2000

본 연구에서는 밤차로부터 용출한 차액의 단당류, 아미노산 및 카페인을 시판중인 현미녹차와 결명자차의 차액과 비교분석함을써 밤차의 기능성 건강음료로 활용하기 위한 기초자료를 규명하였으며 그 결과는 다음과 같다. 1. 현미녹차의 차액에는glucose와 galactose약 20:1 정도의 비율로 검출되었으며 용출시간이나 용출온도에 따른 당류의 변화는 적다. 2. 밤차의 차액에는 glucose, galactose, mannose등이 약 100:1:10의 비율로 존재하여 용출시간이나 용출온도에 의한 변화는 적다. 특히 mannoxe는 천연에서 유리상태로존재하기 어려운 희귀한 유리당이다. 3. 결명자차 차액에서는 당류를 확인할 수 없을 정도로 낮은 농도를 나타냈으며 결명자차의 amino산 함량은 현미녹착나 밤속껍질차의 아미노산 함량에 의해 1.6~1/7에 지나지 않았다.4. 현미녹차의 차액 중 아미노산은 glutamic acid, aspartic acid, serine, methionine, alanine 등의 순서로 검출되었으며, 용출온도와 용출시간에 비례하여 농도가 증가하였고, 아미노산의 용출은 대부분 첫회에 이루어지고 있다는 것을 알 수 있었다. 5. 밤차의 차액 중에 아미노산은 alanine, asparagine, aspartic acid, proline, valine 등의 순으로 많이 함유되어 있고, alanine, asparagine, proline등은 현미녹차에 비하여 함유량이 많으며 glutamic acid, serine, methionine, glutamine 등은 상대적으로 소량 함유되어 있었다. 용출온도와 용출시간에 비례하여 농도가 증가하는 경향을 나타냈으며 아미노산의 요출은 대부분 첫회에 이루어지고 있다는 것을 알수 있었다. 6. 현미녹차는 카페인을 126~162 mg/L 정도로 다량 함유하고 있으나 밤차나 결명자차는 함유하지 않았다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.6A
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• pp.643-651
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• 2008

In this paper, we analyze the performance of normalized SNR based proportional fair scheduling with partial feedback information for multiuser MIMO-OFDMA systems. The closed form expression on the downlink capacity of the selective partial CQI feedback scheme is derived and its asymptotic behavior is investigated. From the performance analysis and numerical results, it is found that the optimal growth rate of downlink capacity can be achieved with bounded average feedback overhead irrespective of the number of users.

• Analytical Science and Technology
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• v.18 no.4
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• pp.292-297
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• 2005

The effect of neutron irradiation on the chemical properties was measured in boric acid solution. The pH of the solution decreased in proportion to the irradiation time and the concentration of boric acid. The concentration of hydrogen peroxide, which is one of the radiolysis products of water, is in proportion to the concentration of boric acid, while in inverse proportion to the irradiation time. The oxygen and hydrogen gases had same chemically equivalent ratio in water radiolysis. The lithiun, which comes from $^{10}B(n,{\alpha})^7Li$, had poor relationship with neutron irradiation time at low concentration, $233{\sim}699{\mu}g/mL$, of boric acid, but the relationship was improved at higher concentration.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.2
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• pp.67-74
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• 2005

This paper concerns attitude controller design for a 3-staged launch vehicle which has movable nozzle TVC systems for all stages as its control systems. The PD-type control gains are determined by shaping the corresponding closed-loop natural frequencies for the purpose of guaranteeing the required stability margin. Bending filters are also designed to stabilize the bending modes by using parametric optimization method. The designed controllers are verified using six degree of freedom flight simulations in MATLAB.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.11a
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• pp.113-116
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• 2011

고해상도 이미지 센서를 장착한 고가의 모바일 제품들이 확산되면서 중간값 필터에 기반을 둔 잡음 제거 필터의 필요성이 증가하고 있다. 이는 초박형 카메라에 내장된 이미지 센서의 물리적인 수광부 면적이 줄어듦에 따라 이미지 센서의 SNR이 떨어지기 때문이다. 게다가 영상의 해상도가 매우 높기 때문에 잡음제거 필터는 초고속으로 동작해야 한다. 따라서 잡음 제거 필터의 핵심 기능인 중간값 필터는 높은 동작주파수에서도 효과적으로 동작해야 한다. 초고속으로 동작하는 필터를 하드웨어로 구현하려면 입출력 간의 물리적 지연시간을 클럭의 주기 단위로 나누어서, 시분할하여 순차적으로 처리하는 파이프라인 구조를 가져야 한다. 파이프라인 단계는 많은 비용이 소모되는 레지스터로 구현되므로 파이프라인 단계를 줄이는 것이 바람직하다. 본 논문에서는 입력부터 출력까지의 물리적 지연시간이 데이터의 수에 비례하는 기존의 중간값 필터와 달리, 데이터 수의 로그값에 비례하는 중간값 필터의 구조를 제안한다. 제안한 중간값 필터는 서로 다른 값을 가지는 데이터 집합에서의 중간값은 자신보다 큰 원소의 수와, 작은 원소의 수가 같다는 사실을 이용하며, 버블 정렬 구조에 기반을 둔 중간값 필터에 비해서 같은 동작주파수에서의 게이트 수가 25.3% 줄어든다. 중간값 필터는 잡음제거나 위색제거 등에서도 널리 사용되고 있으므로, 제안한 구조의 중간값 필터는 초고속으로 동작하는 이미지 신호 처리기의 효과적인 구현에 적합하다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.04a
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• pp.284-288
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• 2010

Length of staircase get longer and evacuation load get heavier in proportion to the building height. Therefore evacuation time could be considered proportional to square of building height. While smoke spreads vertically so rapidly, evacuation speed is too slow, therefore the reasonable measure for the safe of egress route is urgent. Existing pressurizing smoke control system of vertical exit route is seriously limited in function under the stack effect in winter. Stack effect in winter could be overcome with the methods of opening the staircase outward or letting airflow be free between staircase and outside.

• Korean Journal of Optics and Photonics
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• v.6 no.3
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• pp.222-227
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• 1995

A single mode, 100-mW diode laser was injection-locked by the master laser which was spectrally narrowed with Littman-type grating feedback. In the incomplete-injection-locking, we observed that two frequencies were simultaneously generated from the slave laser. The power ratio and frequency shift of two frequency components were proportional to the square of injected laser intensity. When the ratio of the injection intensity to the slave laser intensity was about $10^{-3}$, the injection-locking bandwidth was to be about 1.4 GHz. The bandwidth proportionally increased to the square root of the injection intensity, which was in good agreement with the theoretical predictions. The Iinewidth of the locked-laser was about 2.5 MHz, which was five times as narrow as that of free-running operation. ation.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.11 no.6
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• pp.90-95
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• 1997

In designing a resonant circuit of the inverter which puts induction heating with high frequency to the load, an inductance L of the circuit, the coupling coefficient of a transformer transfering the output power to load, and the coupling coefficient of load circuit heating with coil affect to the output power of a resonant circuit, the circuit Q and the frequency. Those characteristics of the circuit are analyzed through Thevenan's equivalent circuit of the coupling coefficient type which is derived from the T-type equivalent circuit of a transformer. On this equivalent circuit, the impedance of a transformer referred to its primary side is not only proportional the square of turn ratio, nZ, but also the square of coupling coefficient, K2 This paper proposed a more accurate fundamental method to design a resonant circuit of the inverter by using the Thevenan's equivalent circuit.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.04a
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• pp.167-174
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• 2011

Solid propulsion systems have simple structures compared to other propulsion systems and are suitable to long-term storage. However the systems generally have limits on control of thrust levels. In this paper we suggest control algorithms for combustion chamber pressure of variable thrust solid propulsion systems using special nozzles such as pintle valve. For this we use a simple pressure change model by considering only mass conservation within the combustion chamber, design a classical algorithm and also a nonlinear controller using feedback linearization technique. Derived thrust equation and designe a thrust control model. We design the proportion-integral controller for linearizing about operating point. We also demonstrate the performance of controller model through numerical simulations.

• Korean Journal of Optics and Photonics
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• v.1 no.1
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• pp.1-6
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• 1990

We studied two-photon-resonant three-photon ionization processes via 4D[channel #1] and 5S(channel #2] intermediate state of Na atom in a quartz ionization cell. For each channel. the bandwidth of ionization spectrum increased linearly with laser intensity and the ionization signal followed J3 dependence at low intensity. Compared with channel # 1 . ionization signal of channel #2 was enhanced by a factor of 20 - 25. The measured AC Stark shift factor of 3S - 4I) transition was $174\pm60MHz/MW/textrm{cm}^2$..