• Journal of the Institute of Electronics and Information Engineers
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• 제51권1호
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• pp.116-125
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• 2014

Road conditions can provide important information for driving safety in driving assistance systems. The input images usually include unnecessary information and they need to be analyzed only in a region of interest (ROI) to reduce the amount of computation. In this paper, a vision-based road ROI determination algorithm is proposed to detect the road region using the positional information of a vanishing point and line segments. The line segments are detected using Canny's edge detection and Hough transform. The vanishing point is traced by a Kalman filter to reduce the false detection due to noises. The road ROI can be determined automatically and adaptively in every frame after initialization. The proposed method is implemented using C++ and the OpenCV library, and the road ROIs are obtained from various video images of black boxes. The results show that the proposed algorithm is robust.

• Journal of Korea Multimedia Society
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• 제12권7호
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• pp.922-928
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• 2009

In H.264 as the newest video standard, 9 modes are used in order to predict the signal values of a block composed with several pixels by intra prediction. From these process, H.264 can bring high compression ratio in the encoded signal but the use of total 9 modes can give the inefficiency of the increase of the complexity induced by the amount of operation processing or the number of searching which is applied to compare adjacent pixels. This paper proposes a simplification method of prediction mode for the intra-picture coding by considering subjective interest region. There are certain region being interested within a picture of the video sequence. This region requires better subjective picture quality than the other regions. The proposed method increases the simplification of prediction mode by providing just essential modes of total 9 modes for less interest regions compared with the interest region. It is possible to get the additional 11%$\sim$15% simplification of the prediction mode by the proposed method, compared with the conventional method which simplifies the prediction mode for all of the picture by using the prediction characteristics only.

• Journal of Korea Multimedia Society
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• 제12권7호
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• pp.913-921
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• 2009

Quantization is an essential method for compression of video. The quantizer can adjust the bitrate and control the picture quality. Especially, the subjective picture quality can be improved if the concerned region within a video sequence has good picture quality. In this paper, firstly a classification method according to the subjective concerned region within the video sequence is suggested. Also we propose a method that assigns the quantization step-size differentially according to the concerned region within the video. Totally subjective picture quality can be increased by appling the quantization step-size as small value relatively for the concerned region compared with the other regions. We can find the result that the proposed method gives the improved picture quality by assigning differently quantization step-size and the best improvement can be brought when the difference between maximum and minimum values of the quantization step-size in a picture is from 4 to 8.

• Journal of KIISE:Software and Applications
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• 제27권3호
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• pp.248-256
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• 2000

This paper presents a personalized web agent that constructs user profile which consists of user preferences on the web and recommends his/her relevant information to the user. The personalized web agent consists of monitor agent, user profile construction agent, and user profile refinement agent. The monitor agent makes a user describe his/her preferences directly and it creates the database of preference document, finally performs several keyword extraction to increase the accuracy of the DB. The user profile construction agent transforms the extracted keywords into user profile that could be confirmed and edited by the user. and the refinement agent refines user profile by recursively learning and processing user feedback. In this paper, we describe the several keyword weighting and inductive learning techniques in detail. Finally, we describe the adaptive web retrieval and push agent that perform adaptive services to the user.

• The Journal of Korean Association of Computer Education
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• 제17권6호
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• pp.123-133
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• 2014

This study explores the empirical impact of parents' concerns and cultural capital on using Internet with elementary school children. Using the representative data from the 2010 korean adolescent panel data, this study found that the degree of parents' concern for their child directly affected to the Internet using behavior. This study showed the following results. The patterns of Internet use depended on their parents' attitude. The time for game decreased according to the increase of the parents' concern, while the time for searching information for learning increased. Cultural capital directly and indirectly affected to the behavior of Internet use. These results implied that children felt less need to use Internet to spend their time since they learned how to spend the time and to make relationships with other children through the cultural experiences.

• Journal of the Korea Society of Computer and Information
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• 제16권12호
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• pp.49-57
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• 2011

Extraction of regions of interest (ROIs) is the first and important step for the applications in computer vision and affects the rest of the application process. However, ROI extraction can be easily affected by the environment such as illumination, camera, etc. Many applications adopt problem-specific knowledge and/or post-processing to correct the error occurred in ROI extraction. In this paper, proposed is a robust framework that could overcome the environmental change and is independent from the rest of the process. The proposed framework uses a differential image and a color distribution to extract ROIs. The color distribution can be learned on-line, which make the framework to be robust to environmental change. Even more, the components of the framework are independent each other, which makes the framework flexible and extensible. The usefulness of the proposed framework is demonstrated with the application of hand region extraction in an image sequence.

• Journal of the Korean housing association
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• 제7권2호
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• pp.45-56
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• 1996

본 연구의 목적은 한국에서 장래에 이루어질 노인주거연구의 주제를 예측할 수 있도록 일본, 미국, 한국의 노인주거연구의 경향의 차이를 파악하고 비교하기 위한 것이다. 본 연구는 세나라에서 1940년대부터 1990년대 현대까지 발표된 노인주거연구에 대한 학술지와 논문을 분석함으로써 이루어졌다. 세 나라에서 전체 772편의 논문을 수집하여 이를 발표된 연도와 주제에 따라 분류하였다. 본 연구는 일본과 미국의 연구 경향의 특징을 별도로 발표한 후속 연구이다. 일본에서는 1950년대에 노인주거에 대한 연구가 시작되어 80년대 후반에 절정을 이루었으며, 그 이후로 서서히 관심이 줄어들고 있는 추세이다. 일본에서의 주요 주제는 노인홈과 노인시설내의 주 생활조사, 3대 동거 주택, 유료노인홈과 노인시설의 소비자 문제등이다. 미국의 경우, 노인주거의 연구는 일본보다 빠른 1940년대에 시작되어 70년대와 80년대에 걸쳐서 다른 때보다 더 많은 연구가 발표되었다. 주요주제는 1970년대부터 80년대에는 노인주거와 노인시설에 집중되어 있었으나 80년대 이후에 노인주거의 연구방법과 노인주택정책방향으로 관심이 바뀌고 있다. 한국에서의 노인주거에 대한 연구는 세나라 중에서 가장 늦은, 1970년대 후반부터 시작되어 80년대 후반 이래로 그 관심이 점점 증가하고 있다. 한국에서 가장 관심이 있는 연구대상의 하나는 일본과 마찬가지로 기혼자녀와 노부모와의 동거주택에 대한 주제이다. 이상 세나라의 연구주제에서의 차이점은, 한국과 일본에서는 모두 노인주거와 연구방법 분야에는 비교적 관심이 적은 반면, 미국에서는 3대동거주택에 대한 관심이 적은 것이다. 일본과 미국 두나라에 비하여 한국에서는 노인주거 연구에 있어서 아직까지 다양한 주제를 발견하기 어려운데 그 이유는 한국에서는 노인주거에 대한 구체적인 개발이 아직까지 이루어지지 않아서 노인주거에 대한 경험도 많지 않기 때문이라고 생각된다. 앞으로 한국에서도 노인주거가 개발된다면 그 후에는 보다 다양한 연구주제가 나타날 것이라고 기대된다. 예를 들면 노인거주시설의 질적인 비교, 특수한 형태의 노인주거에 대한 요구, 노인주거내의 주생활조사나 평가, 노인을 위한 설비의 디자인 등에 관한 연구들을 생각해 볼 수 있다.

• Journal of Broadcast Engineering
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• 제17권4호
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• pp.670-675
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• 2012

If the region of interest (ROI) is set within the picture of image and video and the high quality is provided in ROI compared to Non ROI, then overall subjective picture quality can be increased. ROI extracted by the color camera only increases the calculation complexity and reduces the extraction accuracy. In this paper, we use depth camera to set the ROI and calculate the object distance from camera, then propose a method that the different picture quality is controlled by depending on the distance of an object. That is, we apply a high quantization step size to the far object, but relatively a low quantization step size to the close object, so better picture quality can be provided. Simulation results show that applying the differential quantization step size to the distance of objects by the proposed method can improve the subjective picture quality.

• KIPS Transactions on Software and Data Engineering
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• 제3권2호
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• pp.101-108
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• 2014

As browsing and sharing multimedia contents through various social network services have become very common these days. there has been a rising demand for effectively provide appropriate multimedia contents to users depending on their interest and characteristics. Especially, considering the enormous volume of multimedia contents created daily, user satisfaction heavily depends on effective selection of appropriate multimedia contents. For instance, if the acquisition of contents is based on friends or related people, then it is usually considered to be more trustworthy. Facebook page is one of the social spaces where people can obtain various information of interest. Still, users have difficulty in finding proper information because Facebook generates tremendous amount of data daily. In this paper, we proposed a scheme to extract and select Facebook page contents effectively. In our proposed scheme, users are grouped based on mutual intimacy and Facebook pages of interest are selected based on the ranking of importance. We show the performance of our scheme through experiments.

• Journal of the Korea Academia-Industrial cooperation Society
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• 제20권5호
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• pp.191-199
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• 2019

This study used a contents analysis method of newspapers to related to urban regeneration and tourism. The role of tourism in urban regeneration has become very important recently as social and cultural regeneration has become more important than physical regeneration. Despite this importance, relevant policies or regulations are very insufficient in our country. Therefore, this study was to examine the interest in urban regeneration and tourism in our society through the contents analysis of the number and content of newspaper articles and analyze the trend empirically. As a result, the degree of interest in urban regeneration and tourism was able to confirm that the level of interest in tourism was increasing year by year. It suggested that the government needs to enhance the quality of tourism contents and actively implement the system in order to promote urban regeneration projects in the future.