• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.6A
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• pp.794-801
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• 2000

In this paper, the efficient new performance evaluation method for digital communication channels is suggested and verified its efficiency in terms of simulation run-tim for the digital satellite broadcasting satellite TV channel. In order to solve the difficulties of the existing Importance Sampling(IS) Technics, we adopted the discrete probability mass function(PMF) in the new method for estimating the statistical characteristics of received signals from the measured Nth order central moments. From the discrete probability mass function obtained with less number of the received signal than the one required in the IS technic, continuous cumulative probability function and its inverse function are exactly estimated by using interpolation and extrapolation technic. And the overall channel is simplified with encoding block, inner channel performance degra-dation modeing block which is modeled with the Uniform Random Number Generator (URNG) and concatenated Inverse Cummulative Pr bility Distribution function, and decoding block. With the simplified channel model, the overall performance evaluation can be done within a drastically reduced time. The simulation results applied to the nonlinear digital satellite broadcasting TV channel showed the great efficiency of the alogrithm in the sense of computer run time, and demonstrated that the existing problems of IS for the nonlinear satellite channels with coding and M-dimensional memory can be completely solved.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.43 no.3 s.309
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• pp.17-24
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• 2006

In this paper, an algorithm for anchor frame detection in news video is proposed, which consists of four steps. In the first step, the cumulative histogram method is used to detect shot boundaries in order to segment a news video into video shots. In the second step, skin color information is used to detect face regions in each shot boundary. In the third step, color information of upper body regions is used to extract anchor object, which produces candidate anchor frames. Then, from the candidate anchor frames, a graph-theoretic cluster analysis algorithm is utilized to classify the news video into anchor-person frames and non-anchor frames. Experiment results have shown the effectiveness of the proposed algorithm.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.39 no.4
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• pp.455-461
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• 2002

This paper presents a new parametric log line equation of polar form for Hough transform in log-polar plane, in which it can remove the well-known unboundedness problem of Hough parameters. Bolduc's method is used to generate a log-polar image dividing the fovea and periphery from a Cartesian image. Edges of the fovea and periphery are detected by using the Sobel mask and the proposed space-variant gradient mask, and are combined in the log-polar plane. The sampled points that might constitute a log line are quite sparse in a deep peripheral region due to severe under-sampling, which is an inherent property of LPM. To cope with such under-sampling, we determine the values of cumulative cells in Hough space by using the space-variant weighting. In our experiments, the proposed method demonstrates its validity of detecting not only the lines passing through both the fovea and periphery but also the lines in a deep periphery.

• Strategy21
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• s.43
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• pp.273-302
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• 2018

1980년대 북 핵개발을 처음 발견 이후, 미국은 북한의 비핵화라는 정책목적달성을 위해 다양한 정책을 사용해 왔지만 현재까지 실패하였다. 미국의 대북 정책 실패의 결과는 북핵 문제의 고착화 속에서, 평양의 핵무기 개발 가속화 야기로 한반도 및 미국을 핵위협 속에 놓이게 하였다. 특히, 지난 해, 북미간의 가열된 공격적 수사와 행동에 의한 한반도 위기설은 절정에 달하였다. 해결의 실마리가 보이지 않던 한반도의 갈등 및 위기는, 지난 4월에 열린 남북 정상회담을 통해 25년간의 핵위협의 굴레를 벗어날 기회를 다시 한번 맞이하게 되었다. 남북 정상회담 이후 이어질 북미 정상회담 등 향후 미국의 정책은 한반도 비핵화를 위한 중요한 분수령에 다시 한번 서있다. 하지만, 과거의 25년간의 역사는 다시 맞이한 '한반도의 봄'에 대한 낙관적 희망만을 주지 않는다. 과거, 양자적, 다자적 협상을 이룸에도 불구하고, 북핵 문제는 다시 위기에 접어드는 반복된 패턴과 사이클 속에 악화 되어 왔기 때문이다. 비핵화의 분수령에 있는 미 정부는 다시 한번 과거의 정책을 뒤돌아 보고, 남북 정상회담을 통해 어렵게 맞이한 기회를 결실로 이룰 수 있도록 어느 때 보다 신중한 노력이 필요하다. 최근 몇 달간 북핵 문제는 경이로운 속도로 진전을 보였지만, 한순간의 정책의 실패는 최근 보여진 진전의 속도 이상의 속도로 문제를 악화 시킬 수 있으며, 그 결과는 작년 여름과 겨울의 위기보다 더욱 심각 할 수 있음을 명심해야 한다. 이러한 점에서 이 보고서는 과거의 역사 및 이론적 분석을 통해 과거 미국의 북핵정책 실패 원인을 분석하고 정책을 제언하는데 그 목적이 있다. 과거 미 북핵 실패의 원인은 크게 3가지로 보인다. 먼저, 포괄적인 그리고 북한 정권의 특성에서 비롯된 북핵 개발의 모티브를 정확히 이해하는데 실패하여, 북한의 정책적 계산을 변화 시키는데 실패 하였다. 둘째, 북한 문제를 둘러싼 외부적 복잡성이 미북핵 정책실패를 야기하였다. 한반도 문제는 과거부터 다양한 국가들의 이해관계에 둘러 싸여 왔다. 북핵 문제도 남북 및 미국을 비롯 중국 등 주변국의 복잡성이 불확실성을 가중시켜 문제를 더욱 복잡하게 하였으며, 미국의 대북 협상의 영향력을 약화 시켰다. 셋째, 과거 누적된 두 국가간의 불신은 협상 이후 상대의 신뢰 있는 이행에 대한 불신을 야기하여 미국의 정책의 효과성을 저해하였다. 미국은 북핵 개발 모티브에 대한 포괄적 이해와 한국 및 중국과의 다자외교로 과거의 실패를 극복하고 25년간의 북핵문제의 고리를 끊어야 할 것이다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.37 no.6
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• pp.17-23
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• 2000

In this study, we prepared red organic light-emitting-diode(OLED) with a fluorescent dye(Sq)-doped and inserted between emission and cathode layer 1,3-bis(5-p-t-butylphenyl)-1,3,4-oxadiazol-2-yl)benzene (OXD7) or/and tris(8-hydroxyquinoline) aluminum ($Alq_3$) layers for increasing electroluminescent(EL) efficiency. This inserting effect has been observed and EL mechanism characteristics have been examined. The hole transfer layer is a N,N'-diphenyl-N,N'-bis-(3-methyl phenyl)-1,1'-diphenyl-4,4'-diamine (TPD), and the host and guest materials of emission layer is $Alq_3$ and bis[1-methyl-3,3'-dimethyl-2-indorindiylmethyl] squaraine (Sq), respectively. For the inserting of $Alq_3$, emission efficiency increased. But we can not obtained highly pure red emission owing to the emission of inserting $Alq_3$ layer. The inserting of OXD7 makes hole block and accumulate. Because of increasing recombination probability of electron and hole, highly pure red color can be held. Simultaneously brightness characteristics and emission efficiency could improve.

• Journal of Digital Convergence
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• v.15 no.8
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• pp.375-381
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• 2017

The America film, Beauty and Beast has grossed over 4,273,401 after being released for 21 days. The growth of movie profit in the video market is also developing rapidly. In this paper, we will focus on the PLF(Premium Large-Format) video technology, because PLF video technology can help audience to enhance the sense of 'immersion' and enjoy a different visual feast. In PLF video technology, IMAX, screen X, 360 degrees circular screen are the most important formats. By comparative analysis of these 3 formats, the biggest difference is their number of screens and appearance. Based on the result we can understand the 3 kinds of PLF platforms better and help us to make a choice between them. In addition, further research about the manufacture method of PLF technology will be discussed.

• Tunnel and Underground Space
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• v.17 no.5
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• pp.360-371
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• 2007

This paper presents an application of drainage control and slope stability by GIS-based hydrological modeling to control the surface water from an operational point of view. This study was carried out on a region of Pasir open-pit coal mine, Indonesia. A detailed topographical survey was performed at the study area to generate a reliable DEM (Digital Elevation Model). Hydrology tools implemented in ArcGIS 9.1 were used to extract the characteristics of drainage system such as flow direction, flow accumulation and catchment area from DEM. The results of hydrological modeling and spatial analysis showed that current arrangement of pumping facility is not suitable and some vulnerable places to erosion exist on the bench face due to concentrated surface runoff. Finally, some practical measures were suggested to optimize the design of drainage system and to monitor the slope stability by the surface water management at the study region during heavy rainfall.

• Journal of the Korea Convergence Society
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• v.9 no.9
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• pp.53-60
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• 2018

In order to manage energy efficiency by analyzing the amount of energy, it would determine the nature of the factors involved in the energy utilization. Therefore, accurate measurement of the energy consumption data is an important factor in the energy management. In this study, we are aware of the importance of the data measurement, and proposes the accuracy assessment of electric energy monitoring system. According to conventional statistical methods it is proceeded as follows; i)the measurement error value would be determined by a random variable, ii) setting the confidence interval to consider the distribution of the statistic and determines the confidence level of the measurement accuracy. And using the t-distribution CDF is used to facilitate even small sample data.

• Journal of Korea Water Resources Association
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• v.44 no.12
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• pp.967-974
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• 2011

Based on daily time series from RDAPS numerical weather forecast, Streamflow prediction was simulated and the result of ESP analysis was implemented considering quantitative mid- and long-term forecast to compare the results and review applicability. The result of ESP, ESP considering quantitative weather forecast, and flow forecast from RDAPS numerical weather forecast were compared and analyzed with average observed streamflow in Guem River Basin. Through this process, the improvement effect per method was estimated. The result of ESP considering weather information was satisfactory relatively based on long-term flow forecast simulation result. Discrepancy ratio analysis for estimating accuracy of probability forecast had similar result. It is expected to simulate more accurate flow forecast for RDAPS numerical weather forecast with improved daily scenario including time resolution, which is able to accumulate 3 hours rainfall or continuous simulation estimation.

• Journal of Wetlands Research
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• v.8 no.1
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• pp.49-58
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• 2006

Drought is an natural phenomenon which effects greatly on our society. It has various time scale and it is difficult to define the beginning and the end. So we can't aware it quickly and the damage of drought become severe. To cope with these problems, it needs to construct drought monitoring system. And it is required that the definition of drought which is objective and can be applied widely and proper drought index for drought monitoring. Meteorology and hydrology have developed drought index for drought monitoring. There are many attempt to interpret the drought using NDVI(Normalized Difference Vegetation Index) or LST(Land Surface Temperature) in remote sensing. In this study, drought index and precipitation is used to find drought severity of last ten years in South Korea. NDVI and VCI is applied to perceive the state of drought. Finally, the possibility of drought monitoring and evaluating drought depth is estimated by analyzing the correlation between vegetation Index and drought index.