• Journal of Korea Game Society
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• v.16 no.5
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• pp.99-110
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• 2016

This paper proposes the adaptive way that intended screen applies the same proportion of the game screen to mobile devices having various resolution. Generally speaking, clipping is the way to show only part of screen with designated proportion and is widely used in game industry. It costs additionally because developers make game screens fit various resolutions. However, the proposed method of this study saves developing time and cost if automatically calculated output is possible according to designated screen proportion and devices' aspect ratio. This suggested algorithm makes it possible to display game screen in same proportion automatically to various resolution and the mini-map is automatically fixed regardless of the mobile devices' resolution.

• Journal of Advanced Navigation Technology
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• v.21 no.3
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• pp.287-293
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• 2017

This paper describes an unequal Bagley divider using uniform transmission lines with adjustment electrical lengths between output ports. To obtain an arbitrary dividing ratio of Bagley divider, we have only adjusted the electrical lengths of the transmission line between output ports. All the transmission lines have the same characteristic impedance value. This design method does not require an impedance transformer for port matching. For verification, we simulated and fabricated a 3-way, 1:2:1 and 5-way, 2:3:4:3:2 ratio Bagley divider with an operating frequency of 2 GHz. The experimental results are in agreement with the simulated results.

• Plant Journal
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• v.12 no.3
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• pp.39-45
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• 2016

Each of fuel consumption per hour was measured at the 320 MW and 380 MW generator output while changing mixing ratio of bio fuel oil to 50%, 80% and 100%. Fuel consumption per hour was increased from 11.0% to 20.4% as mixing ratio of bio fuel oil was changed from 50% to 100% at the 320 MW generator output comparing with fuel consumption per hour in case of bunker-C oil single firing. Fuel consumption per hour was also increased from 12.0% to 21.1% as mixing ratio of bio fuel oil was changed from 50% to 100% at the generator output 380 MW. Furthermore, it was confirmed that plant efficiency was decreased as mixing ratio of bio fuel oil was increased from 50% to 100% as a result that plant efficiency was calculated using the measured fuel consumption per hour, the generator output and the gross heating value.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.238-238
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• 2011

Ion sensitive field effect transistor (ISFET)는 용액의 이온 농도를 측정하는 반도체 센서로, 1970년 Bergveld에 의해 처음으로 제안되었다. ISFET가 제안된 이래로, 제조공정이 간단하고 감지막의 감지 특성 평가가 용이한 electrolyte-insulator-semiconductor (EIS) pH센서 또한 지속적으로 연구되었다. EIS pH센서는 작은 소자 크기, 견고한 구조, 빠른 응답속도와 CMOS공정과의 호환성이 좋다는 장점이 있다. EIS 또는 ISFET 센서를 이용하여 생물학적 요소의 신호 감지 특성을 평가함에 있어 소자의 signal to noise 비율이 우수해야 한다. EIS pH센서의 높은 signal to noise 비율을 얻기 위해, 소자의 표면적을 증가시키거나 감지막으로 유전상수가 높은 물질을 사용하여 출력 특성을 향상시켜야 한다. 본 연구에서는 trench구조와 SiO2/HfO2/Al2O3 (OHA) 적층 감지막을 갖는 EIS pH센서를 제작하여 출력 특성을 증가시키는 실험을 실시하였다. 120 nm, 380 nm, 780 nm의 다양한 깊이를 가진 trench를 형성하였으며, trench 깊이에 따른 출력특성을 비교하였다. 또한, 제작된 EIS 소자의 pH감지 특성을 분석하였다. 제작된 EIS소자의 감지막 중 SiO2는 Si와 high-k물질의 계면 상태를 보완하기 위한 완충막으로 성장되었고, HfO2는 높은 유전상수를 가지고 있어 signal to noise 비율을 향상시키는 물질로 증착되었다. 최종적으로 Al2O3는 pH용액과의 화학적 손상을 막기 위한 물질로 증착되었다. 실험 결과, trench 깊이가 깊어질수록 출력값이 증가하였고 이는 signal to noise 비율이 향상되는 것을 의미한다. 결론적으로 trench 형성을 통한 표면적 증가와 high-k물질을 적층한 감지막으로 인해 높은 출력 특성을 갖는 우수한 EIS 바이오센서를 제작할 수 있었다.

• Korean Journal of Optics and Photonics
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• v.25 no.2
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• pp.61-66
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• 2014

We report the characterization of a wavelength-swept laser (WSL) using a polygon-based wavelength scanning filter and two semiconductor optical amplifiers (SOAs). The output intensity and scanning bandwidth of the WSL depend on the position of the two SOAs in the laser cavity and the coupling ratio of the output fiber coupler. The outputs of the WSL are characterized for coupling ratios of 10%, 30%, 50%, 70%, and 90% for the output fiber coupler. In the setup in which the output fiber coupler is located between the two SOAs, high output power and wide scanning bandwidth can be achieved with an optimized configuration. Using the optimized configuration of the WSL, the intensity increases with the coupling ratio. These results can be used to construct an optimized WSL using the polygon-based wavelength scanning filter.

• Progress in Medical Physics
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• v.25 no.4
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• pp.218-224
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• 2014

The small field dosimetry is very important in modern radiotherapy because it has been frequently used to treat the tumor with high dose hypo-fractionated radiotherapy or high dose single fraction stereotactic radiosurgery (SRS) with small size target. But, the dosimetry of a small field (< $3{\times}3cm^2$) has been great challenges in radiotherapy. Small field dosimetry is difficult because of (a) a lack of lateral electronic equilibrium, (b) steep dose gradients, and (c) partial blocking of the source. The objectives of this study were to measure and verify with the various detectors the output factors in a small field (<3 cm) for the 6 MV photon beams. Output factors were measured using the CC13, CC01, EDGE detector, thermoluminescence dosimeters (TLDs), and Gafchromic EBT2 films at the sizes of field such as $0.5{\times}0.5$, $1{\times}1$, $2{\times}2$, $3{\times}3$, $5{\times}5$, and $10{\times}10cm^2$. The differences in the output factors with the various detectors increased with decreasing field size. Our study demonstrates that the dosimetry for a small photon beam (< $3{\times}3cm^2$) should use CC01 or EDGE detectors with a small active volume. And also, Output factors with the EDGE detectors in a small field (< $3{\times}3cm^2$) coincided well with the Gafchromic EBT2 films.

• Proceedings of the Optical Society of Korea Conference
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• 2000.02a
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• pp.42-43
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• 2000

레이저 시스템에서의 혼돈에 관한 연구는 Q-스위칭 레이저$^{(1)}$ , 모드록킹 레이저$^{(2)}$ 그리고 Nd:YAG 레이저의 제2차 고조파에서$^{(3)}$ 실험적으로 수행되었다. 또한 이러한 실험적인 결과들을 레이저 비율 방정식을 사용하여 이론적으로 분석하고자 하는 방법들이 보고되었다.$^{(4-6)}$ 그러나 이러한 노력에도 불구하고 여전히 비율 방정식만으로는 만족스럽게 설명하지 못하는 레이저 혼돈 현상들이 많이 존재한다. 레이저시스템에서 알려지지 않은 현상들 중 하나가 발진 문턱 근처에서의 행동이다. 레이저 시스템은 양자 잡음, 펌핑 잡음 등에 의한 잡음 현상들을 나타내는데, 이것들은 때때로 특히 발진 문턱에서의 레이저 동작에 중요한 역할을 한다. 그러한 경우 잡음에 관한 정확한 정보를 가지고 있지 않는 한 비율 방정식만으로 혼돈 현상들을 설명하기란 매우 어려운 일이다. 발진 문턱 근처에서의 레이저 출력에 관한 혼돈 현상은 최근에 수행된 연속 발진 Nd:YAG 레이저와$^{(7)}$ Q-스위칭 Nd:YAG 레이저를$^{(8)}$ 제외하면 보고된 것이 거의 없다. 본 논문에서는 작은 주기적인 변조가 가해진 다이오드 레이저로 들띄운 Nd:YAG 레이저의 내부 발생형 제2차 고조파의 출력이 나타내는 혼돈 현상이 바로 on-off 간헐성임을 보여주는 실험결과를 보고하고자 한다. (중략)

• Proceedings of the Korean Nuclear Society Conference
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• 1997.10a
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• pp.516-521
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• 1997

국내개발 액체금속로 KALIMER 노심으로 설계한 전기출력 150 MWe (열출력 392 MWth)의 U-Zr이원합금핵연료 사용 소형노심에 대하여 열수력 특성을 분석하고, 그 결과를 전기출력 333 MWe (열출력 840 MWth)의 중형노심설계 특성과 비교ㆍ분석하였다. 분석에는 국내개발 액체금속로 KALIMER 노심설계기술 개발의 일환으로서 개발한 개념설계 초기 단계에서의 노심 열수력 특성 분석 방법을 사용하였다. 열수력 특성 분석은 먼저 각 집합체의 최고 선출력에 따라 유량그룹을 설정하고, 각 집합체의 최고온도 연료봉에 대하여 냉각재 온도, 피복관 중심온도, 핵연료 중심온도 등을 계산하는 방식으로 수행하였다. 특성분석 결과 두 노심 모두 노심내 출력분포를 더욱 평탄화 하고, 노심핵연료 영역에 대한 반경방향 블랑？ 영역의 출력비율을 높이는 작업이 필요하다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.11C
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• pp.1040-1048
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• 2009

This paper proposes an auto flesh tone balance algorithm for the picture that is taken for people. General white balance algorithms bring neutral region into focus. But, other objects can be basis if its spectral reflectance is known. In this paper the basis for white balance is human face. For experiment, first, transfer characteristic of image sensor is analyzed and camera output RGB on average face chromaticity under standard illumination is calculated. Second, Output rate for the image is adjusted to make RGB rate for the face photo area taken under unknown illumination RGB rate that is already calculated. Input tri-stimulus XYZ can be calculated from camera output RGB by camera transfer matrix. And input tri-stimulus XYZ is transformed to standard color space (sRGB) using sRGB transfer matrix. For display, RGB data is encoded as eight-bit data after gamma correction. Algorithm is applied to average face color that is light skin color of Macbeth color chart and average color of various face colors that are actually measured.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.2
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• pp.245-251
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• 2017

The proposed variable pawer divider in this paper is composed of one equal power 2-way Wilkinson power divider, two variable phase shifters with 90-degree phase variation to be connected two output paths of the 2-way power divider, and one branchline coupler to combine output signals of two variable phase shifter. The proposed variable power divider can theoretically have an arbitrary power division ratio ranging from ${\infty}:1$ to ${\infty}:1$ due to 90-degrees phase variation of two phase shifter. The proposed power divider circuit fabricates on laminated TLX-9(h=20 mil, er=2.5; Taconic) with a center frequency of 1.7 GHz. The power division ratio of the fabricated prototype varies from about 1:100 to 200:1, with an input reflection characteristic(S11) of below -16 dB, an insertion loss of about -1.0 dB, and an isolation characteristic of below -17 dB between two output ports in the range 1.65-1.75 GHz.