• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제18권2호
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• pp.193-207
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• 2014

In this paper we explore the emergence of the notion of compactness within its historical beginning through rigor versus intuition modes in the treatment of Dirichlet's principle. We emphasize on the intuition in Riemann's statement on the principle criticized by Weierstrass' requirement of rigor followed by Hilbert's restatement again criticized by Hadamard, which pushed the ascension of the notion of compactness in the analysis of PDEs. A brief overview of some techniques and problems involving compactness is presented illustrating the importance of this notion. Compactness is discussed here to raise educational issues regarding rigor vs intuition in mathematical studies. The concept of compactness advanced rapidly after Weierstrass's famous criticism of Riemann's use of the Dirichlet principle. The rigor of Weierstrass contributed to establishment of the concept of compactness, but such a focus on rigor blinded mathematicians to big pictures. Fortunately, Poincar$\acute{e}$ and Hilbert defended Riemann's use of the Dirichlet principle and found a balance between rigor and intuition. There is no theorem without rigor, but we should not be a slave of rigor. Rigor (highly detailed examination with toy models) and intuition (broader view with real models) are essentially complementary to each other.

• 패션비즈니스
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• 제6권2호
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• pp.137-150
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• 2002

The purpose of this study attempts to analyze the symbolism and fashion image of Barbie doll. It is scarcely a coincidence that the Barbie doll was developed in the united States in 1950s. She had been created in the 1950s as a cartoon character in a German newspaper, who named Bild Lilli. In 1959, toy company bought the rights and produced and almost identical doll in the United States. Therefore Barbie has symbolized the consumer culture of United States, ideal body image, and modern youth culture. It may be as a conclusion that Barbie's fashion can be divided into three period : 1. a period of classic fashion(1959-66), 2. a period of young casual fashion(1967-79), 3. a period of ethnic and career fashion. Just as Barbie's roles and clothes have changed with the spirit of the times, she is a valuable representation of female images and fashion over the last 40 years. Barbie's fashion image is divided into material girl image, dream girl image, and bad girl image.

• 한국통신학회논문지
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• 제16권11호
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• pp.1132-1142
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• 1991

본 논문에서는 이동물체의 형태정보를 분석을 위한 이동물체의 특징파라미터를 추출하는 기법을 제안하였다. 이차원 영상에서 이동물체의 추출은 차영상 기법을 이용하였다. 이동물체의 특징 파라미터는 면적과 둘레, 면적과 둘레의 비(A/P ratio), 굴곡점(Vertex), 종횡비(X/Y ratio)로 하였다. 휘도 변화를 600 Lux${\sim}$1400 Lux로 가변시켜 휘도변화에 대한 각 특징파라미터의 오차 허용범위를 결정하였다. 제안된 방법의 타당성을 입증하기 위하여 모형 자동차를 이용하여 동일성을 판별한 결과 판정오류는 6%미만이었다.

• International Journal of Internet, Broadcasting and Communication
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• 제9권4호
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• pp.25-30
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• 2017

Market of smart toys is showing rapid growth globally. Recently, new types of toys which can be synced with smart phones, so called smart toys, are being released continuously. As a result, products from RC cars with camera attached that can be driven and monitored using a connected smart phone to toys that would call kid's name once it has been entered through a mobile app. It has been confirmed that there are various way to connect those toys with mobile devices. In this paper, functions of smart toys are classified, and research on different synchronization methods of the toys sold in market as of July, 2017 are explained.

• 아동학회지
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• 제26권6호
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• pp.173-187
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• 2005

This study examined relations between infants' strategies for emotional regulation and maternal responsiveness. Fifty 24-month-olds were observed for six kinds of emotional regulation strategy during four negative emotion-eliciting tasks; their mothers were observed for five styles of maternal responsiveness during toy-centered free play. Infants used different strategies according to the kinds of negative emotioneliciting tasks; their strategies correlated with maternal responsive styles. In the anger-eliciting tasks, infants used "distraction" and "self soothing." In the fear-eliciting tasks, they used "avoidance" and "problem solving." Infants who received more negative feedback from their mothers used the "irritation" strategy. Infants who got received more positive feedback from their mother used the "getting reference" strategy.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 컴퓨터소사이어티 추계학술대회논문집
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• pp.83-86
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• 2003

This paper suggests user's interface with computer by means of detecting gaze under HMD, head mounted display, environment. System is derived as follows; firstly, calibrate a camera in HMD, which determines geometrical relationship between monitor and captured image. Second, detect the center of pupil using algorithm of the center of mass and represent a gazing position on the computer screen. If user blinks or stares at a certain position for a while, message is sent to computer. Experimental results show the center of mass is robust against glint effects, and detecting error was 7.1%. and 4.85% in vertical and horizontal direction, respectively. To adjust detailed movement of a mouse takes 0.8 sec more. The 98% of blinking is detected successfully and 94% of clicking detection is resulted.

• 아동학회지
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• 제18권1호
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• pp.177-198
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• 1997

This study investigated the viewpoint of teachers on the desirability of computer education in the early childhood classroom. The subjects were 8 kindergarten teachers in Seoul and Kyong'gi Province who used computers in the classroom. Nondirective and open-ended interview methods were used for data collection. Five steps or stages of viewpoints were found: step1-teachers want to have computers in the classroom but have no particular purpose in mind; Step 2-teachers want the children to play with the computers as if it were a toy; Step 3-teachers want to use any programs that are in the computer; Step 4-teachers want to use the computer more purposefully for educational goals; Step 5-teachers want to unify the early childhood curriculum through the multi-media system.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2011년도 춘계학술대회
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• pp.657-662
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• 2011

어린이 장난감은 과거보다 더 안전성의 필요가 되고 있다. 현대 사회의 가족변화로 인한 구성원으로 인하여 어린이가 귀한 존재가 입장이 되었기 때문이다. 이에 따른 어린이 용구에 대한 관심의 집중도가 높아졌으며 장난감에 대한 인식 변화와 안전성을 추구하고자 하는 노력도 많이 커졌다. 이는 어린이들이 장난감을 가장 많이 신체로 접촉하고 있기 때문이다. 장난감의 특성상 어린이, 특히 유아들이지만 입에 물거나 피부에 문지르고 소리나는 것에 민감하고 장난감의 재질에 따른 향, 촉감 등에 반응할 수 있기 때문이다. 이는 어린이의 처음 부딪히는 감각의 느낌과도 연결되어 감각의 기능에서 발전을 가져올 수 있다고 본다. 어린이들의 연령층에 따라 표현력이 부족하기 때문일 것이므로 어린이 장난감의 안전성에 어른들이 주의해야할 이유라고 여긴다. 즉 어린이 장난감의 안전성을 추구할 수 있는 어린이뿐만 아니라 제2의 소비자인 부모, 친척, 친지, 어린이와 연관된 직종의 어른들일 것이다. 장난감의 시장은 서구보다 발전되지 않았지만 근래에 들어 어린이 장난감은 중국이나 동남아에서 제조되어 한국으로 들어오는 경우가 많다. 따라서 안전성에 대한 인식의 제고와 실질적 노력 추구가 더욱 더 필요하다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.433-436
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• 2000

In this paper, we present two types of digital image stabilization (DIS) schemes for mobile video communications. In the first scheme, the DIS system, which is used as a preprocessor of the video encoder, compensates the camera’s undesirable shakes before encoding. This method can reduce the bit rate of encoded video sequence by attenuating the prediction error to be encoded. In the second proposed scheme, the DIS system is coupled with the video decoder. The second scheme uses the K-means clustering algorithm to estimate the camera motion using motion vectors decoded from the received video stream. Simulation results show that the first scheme improves coding efficiency, while the second scheme is computationally efficient since it does not require motion estimation.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 춘계학술대회 논문집
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• pp.551-562
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• 2000

The study was carried out about the design of power Car for Korean High Speed Train of maximum operating speed of 350km/h. The running resistance accounts toy the greater part of overall resistance to front hue motion. So, The Power Car's shape has to be mainly determined by aerodynamic considerations. In the train configuration of the KHST, the front and rear power cars assume the role of a locomotive. They accommodate all the machinery for providing traction. The train is controlled and monitored from power cars. This report was descrived, which focuses on aerodynamics, mass balance, the car body and the layout of the equipment that is fitted into power car.