• Title/Summary/Keyword: 대표파

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Robust Feature Selection and Shot Change Detection Method Using the Neural Networks (강인한 특징 변수 선별과 신경망을 이용한 장면 전환점 검출 기법)

  • Hong, Seung-Bum;Hong, Gyo-Young
    • Journal of Korea Multimedia Society
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    • v.7 no.7
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    • pp.877-885
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    • 2004
  • In this paper, we propose an enhancement shot change detection method using the neural net and the robust feature selection out of multiple features. The previous shot change detection methods usually used single feature and fixed threshold between consecutive frames. However, contents such as color, shape, background, and texture change simultaneously at shot change points in a video sequence. Therefore, in this paper, we detect the shot changes effectively using robust features, which are supplementary each other, rather than using single feature. In this paper, we use the typical CART (classification and regression tree) of data mining method to select the robust features, and the backpropagation neural net to determine the threshold of the each selected features. And to evaluation the performance of the robust feature selection, we compare the proposed method to the PCA(principal component analysis) method of the typical feature selection. According to the experimental result. it was revealed that the performance of our method had better that than the PCA method.

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Situating the Complex Social Functions of a Well-known Investigative Program through a Textual and Production Analysis (SBS <그것이 알고 싶다>의 역할과 성취 그리고 명과 암을 맥락화하기 텍스트 분석과 미디어 생산자연구를 통해서 조명하기)

  • Lee, Keehyeung;Hwang, Kyongah
    • Korean journal of communication and information
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    • v.75
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    • pp.83-144
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    • 2016
  • SBS's -also known as - is one of the most famous investigative programs in South Korean television sector. This program is well-known for its much detailed and tenacious investigation of unsolved crimes, various social wrong-doings, as well as public scandals through a mystery code and meticulous storytelling. As a result, generates much popular interests and responses from local audiences. This work both examines and contextualizes the multiple roles and implications of this program through a textual and production analysis. Especially, it critically pursues this program's achievements and limits in the context of the changing roles of investigative journalism and its unstable status at current juncture.

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Feasibility Study on Soil Moisture Retrieval using GNSS Reflected Signal (GNSS 반사신호를 이용한 토양수분 산출 가능성 연구)

  • Sin, Dae-Yun;Dinesh, Manandhar;Ryosuke, Shibasaki
    • Proceedings of the Korea Water Resources Association Conference
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    • 2016.05a
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    • pp.80-80
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    • 2016
  • GPS로 대표되는 위성항법시스템(GNSS : Global Navigation Satellite System)은 지구 주위를 돌면서 연속적으로 항법신호를 보내고 있다. 그 중 지구표면으로부터 반사되는 항법신호를 수신하고 해석함으로써 지구표면에 관한 정보를 취득할 수가 있다. GPS로 대표되는 항법신호는 L밴드를 사용하기 때문에 토양수분의 변화 등에 대한 반사강도의 감도가 비교적 높다고 알려져 있으며, 토양수분 측정 등에 사용할 수 있다. 뿐만 아니라 경량화, 소형화하기 쉬운 점, 능동적 마이크로웨이브 리모트센싱시스템(Active Microwave Remote Sensing System)과 달리 스스로 신호를 발사하지 않기 때문에 관측의 스텔스성(Stealth)dl 뛰어난 점 등의 장점을 가지고 있다. 또한 향후 10년 이내에 준천정위성(QZSS), Galileo, COMPAS, IRNSS 등 많은 위성항법시스템이 본격 운용되어 GPS와 함께 120기 정도의 항법위성이 항법신호를 송신할 예정이므로 이용 가능성은 크게 늘어날 것으로 기대된다.한편, 항법위성을 이용한 바이스테이틱 리모트센싱은 반사파의 강도가 상당히 미약하기 때문에 정량적 계측모델의 구축은 미미한 상태이다. 즉, 지상 타워에서의 관측, 항공기에서의 관측, 소형 위성에서의 관측 등이 수행되고 있으나, 타워관측과 같이 지상의 거의 동일한 장소를 계속적으로 관측하는 경우를 제외한 기존의 연구에서는 토지의 피복상황이나 토양수분 등의 상관관계를 제시하는 수준으로써 정량적인 계측방법은 아직 확립되어 있지 않다. 이러한 관점에서 본 연구에서는 GPS위성으로부터의 항법신호를 이용하여 지구표면에 관한 정보를 얻는 바이스테이틱 리모트센싱(Bi-static Remote Sensing) 기술을 바탕으로 육지면과 해면의 판별에 신호특성이 어떻게 유효한가를 실험적으로 밝혔다. 이러한 기술은 토양수분 측정 등 수자 원인자를 추출하는데 유용할 뿐만 아니라 수면의 고도 측정, 해상풍 산출 등에도 응용 가능하다.

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A Study on the Liberation Characteristics of Waste Concrete for Production of High Quality Recycled Aggregate (고품질(高品質) 순환골재(循環骨材) 생산(生産)을 위한 폐콘크리트의 단체분리(單體分離) 특성(特性) 연구(硏究))

  • Kim, Kwan-Ho;Mun, Myoung-Wook;Cho, Hee-Chan;Ahn, Ji-Whan
    • Resources Recycling
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    • v.19 no.3
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    • pp.52-61
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    • 2010
  • In general, the waste concrete is simply crushed and reused as a recycled aggregate at a low value application such as back filling material. It because that the quality of recycled aggregate is lower than one of natural aggregate due to the insufficient liberation of aggregate and cement mortar. So in this study, the liberation characteristics of liberation of aggregate and cement mortar is analyzed to investigate the limitation of conventional crushing stage at waste concrete processing circuit. In this process, thermal treatment method is evaluated for the enhancement of liberation. From test results, the preferential breakage along the grain boundary is not accomplished by the conventional crushers. It leads a low quality of recycled aggregate and a fracture of aggregate. To solve these problems, gentle breakage is used as a breakage mechanism to induce preferential breakage along the grain boundary. The recycled aggregate produced from the free fall test, which adopts a gentle breakage, shows a better liberation characteristics and a higher quality.

Establishment of the standard recipe according to preference of Korean, residents foreigner in Korea and American (국내인과 미국인 대상 기호도 조사를 통한 불고기의 표준 레시피 설정에 관한 연구)

  • Kim, Eun-Mi;Seo, Sang-Hee;Kwock, Chang-Keun;Lee, Eun-Jung;Wie, Seug-Hee
    • Korean journal of food and cookery science
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    • v.29 no.5
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    • pp.463-468
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    • 2013
  • This study was conducted to establish a standard recipe for Bulgogi. For the initial result of the study, the process of establishing standard quality indicators was presented based on surveys with regard to the preferences of the Korean people, American residing in Korea and Americans in USA. A basic recipe was selected based on the preference test. Then additional surveys targeting groups of Korean people, American residents in Korea and Americans were conducted after resetting the contents of soy sauce, sugar, spring onion + garlic of the basic recipe. As a result, differences in preferred seasoning contents between the groups were found. Eventually, the decision for the final recipe of the on-the-spot market search was made.

Evaluation of Near Subsurface 2D Vs Distribution Map using SPT-Uphole Tomography Method (SPT-업홀 토모그래피 기법을 이용한 지반의 2차원 전단파 속도 분포의 도출)

  • Bang, Eun-Seok;Kim, Jong-Tae;Kim, Dong-Soo
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.26 no.3C
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    • pp.143-155
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    • 2006
  • SPT-Uphole tomography method was introduced for the evaluation of near subsurface shear wave velocity (Vs) distribution map. In SPT-Uphole method, SPT (Standard Penetration Test) which is common in geotechnical site investigation was used as a source and several surface geophones in line were used as receivers. Vs distribution map which is the triangular shape around the boring point can be developed by tomography inversion. To obtain the exact travel time information of shear wave component, a procedure using the magnitude summation of vertical and horizontal components was used based on the evaluation of particle motion at the surface. It was verified that proposed method could give reliable Vs distribution map through the numerical study using the FEM (Finite Element Method) model. Finally, SPT-Uphole tomography method was performed at the weathered soil site where several boring data with SPT-N values are available, and the feasibility of proposed method was verified in the field.

Effect on Discomfort and Attention Through Analysis of Resting-State Brain Wave Activity in Forward Head Posture (휴식시 뇌파 활성 분석을 통한 거북목 자세의 불편함 및 주의력에 미치는 영향 연구)

  • Ju-Yeon Jung;Chang-Ki Kang
    • Science of Emotion and Sensibility
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    • v.27 no.2
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    • pp.105-112
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    • 2024
  • Forward head posture (FHP) is a representative postural deformation problem in people today, causing various physical and mental problems, but the effect of FHP on discomfort or distraction during rest is not well known. Accordingly, this study aims to demonstrate the effect of FHP on these brain functions by analyzing brain wave signals at rest. Thirty-three heavy users of computers participated in this study, and all of them exhibited functional FHP when using computers. All participants performed using both normal posture and FHP, and their brain waves were measured at rest while maintaining each posture for five minutes without stimulation. Brain wave signals were acquired using EEG with 32 channels, and through frequency analysis, changes in delta and beta waves, known to be closely related to discomfort and attention, were compared and analyzed depending on the posture. As a result, FHP showed a significant decrease in delta waves in nine channels compared to the normal posture, and a significant increase in beta waves in 14 channels, showing that FHP does affect brain function at rest. These changes are consistent with those that occur under conditions of psychological discomfort and distraction, and they appear to be because the increased discomfort caused by musculoskeletal changes in the FHP also affects brain activity. These can provide important results showing that posture correction can help improve brain function and psychological state at rest.

A Design of 16-QAM Modulator by use of Direct Digital Frequency Synthesizer (디지탈 직접 주파수 합성기를 이용한 16-QAM 변조기 설계)

  • 유상범;유흥균
    • The Journal of the Acoustical Society of Korea
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    • v.18 no.5
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    • pp.52-57
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    • 1999
  • It is very important to design of QAM modulator of high spectral efficiency for high speed data transmission. In this paper, typical 16-QAM modulator is designed by modification design of DDFS(direct digital frequency synthesizer). DDFS generates sinusoidal waveform digitally to the frequency setting word. Phase modulation is accuratly made by control of a generated phase increment value and amplitude modulation is accomplished in the D/A converter output by control of amplitude level. For the suppression of harmonics and glitch, dual-structured DDFS is studied to improve the spurious characteristics. P-Spice is used for design and simulation in mixed mode. Also we can get the satisfactory results of designed 16-QAM modulator from the constellation output.

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Case Study of Hana TV as TV Portal (TV 포털 미디어 사례 연구 -하나 TV의 콘텐츠 이용 실태를 중심으로-)

  • Lee, Moon-Haeng
    • The Journal of the Korea Contents Association
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    • v.7 no.10
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    • pp.135-145
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    • 2007
  • Hana TV, representative TV portal, has the similar function of internet portal media. This study will focus on the practical use of Hana TV which is increasing rapidly its subscribers. Monthly connecting rate by subscriber, frequency of program request will be analysed. For this research, the data, documents of Hana TV and its home page were taken. According to the analyse, the subscribers of Hana TV prefer to watch free TV's programs and hope to watch more free TV's library.

Trip Generation Model Using Backpropagation Neural Networks in Comparison with linear/nonlinear Regression Analysis (신경망 이론을 이용한 통행발생 모형연구 (선형/비선형 회귀모형과의 비교))

  • 장수은;김대현;임강원
    • Journal of Korean Society of Transportation
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    • v.18 no.4
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    • pp.95-105
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    • 2000
  • The Purpose of this study is to present a new Trip Generation Model using Backpropagation Neural Networks. For this purpose, it is compared the performance between existing linear/nonlinear Regression models and a new TriP Generation model using Neural Networks. The study was performed according to the below. First, it is analyzed the limits of conventional Regression models, next Proved the superiority of Neural Networks model in theoretical and empirical aspects, and lastly Presented a new approach of Trip Generation methodology. The results show that Backpropagation Neural Networks model is predominant in estimation and Prediction comparable to Regression analysis. Such results mean the possibility of Neural Networks\` application in Trip Generation modeling. Specially under the circumstances of the chancing transportation situations and unstable transportation on vironments, its application in transportation fields will be extended.

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