• 한국게임학회 논문지
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• 제21권6호
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• pp.111-124
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• 2021

회화를 기점으로 영화, 만화, 게임을 아울러 관객의 시선을 묶는 행위의 주축을 담당하는 것은 프레임이다. 프레임에 대해 안다는 것은 프레임을 읽을 수 있게 되는 것이며, 사용할 수 있게 되는 것이다. 따라서 본 논문은 디지털 게임의 프레임, 그 중에서도 일차 프레임의 한정된 구성을 보완하는 다중 프레임에 관해 다룬다. 본 논문에서는 게임의 기본 구성인 구조적 프레임, 플레이어 행위의 출력인 가변적 프레임, 기존 시각 매체 특성을 나타내는 표면적 프레임으로 다중 프레임을 분류한다. 이를 통해 디지털 게임 설계 장치로서의 다중 프레임의 양상을 살펴본다. 본 논문은 향후 게임의 다중 프레임 활용 가능성을 도출하고 다중 프레임 분석의 기제를 제공했다는 데서 유의미하다.

• Structural Engineering and Mechanics
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• 제43권1호
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• pp.31-51
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• 2012

This paper presents a computational study that explores the design of rigid steel frames by considering construction related costs. More specifically, two different aspects are investigated in this study focusing on the effects of (a) reducing the number of labor intensive rigid connections within a frame of given geometric layout, and (b) reducing the number of different member section types used in the frame. A genetic algorithm based optimization framework searches design space for these objectives. Unlike some studies that express connection cost as a factor of the entire frame weight, here connections and their associated cost factors are explicitly represented at the member level to evaluate the cost of connections associated with each beam. In addition, because variety in member section types can drive up construction related costs, its effects are evaluated implicitly by generating curves that show the trade off between cost and different numbers of section types used within the frame. Our results show that designs in which all connections are considered to be rigid can be excessively conservative: rigid connections can often be eliminated without any appreciable increase in frame weight, resulting in a reduction in overall cost. Eliminating additional rigid connections leads to further reductions in cost, even as frame weight increases, up to a certain point. These complex relationships between overall cost, rigid connections, and member section types are presented for a representative five-story steel frame.

• 소성∙가공
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• 제20권2호
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• pp.104-109
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• 2011

The metal front case of a mobile phone is manufactured by press forming and welding of thin metal sheets. Twisting of the frame after the forming process is one of main obstacle for the assembly with reinforcement by welding. This study introduces a method preventing twisting of the metal front case frame in press forming. The spring-back after forming produces twisting of the frame, which leads to a low structural stiffness. To reduce twisting, connectors are required to reinforce the structural stiffness of the frame. In this study, the twisting profile is evaluated using a finite element(FE) analysis for various connector shapes. The actual connector shape is determined by minimization of the frame twisting within the tolerance of the FE-analysis. To verify the validity of the proposed blank shape, a forming experiment is performed and the twisting profile is measured using a 3D laser scanning method. The dimensional accuracy is found to be within the tolerance and in good agreement with the FE-analysis.

• 한국과학교육학회지
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• 제42권5호
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• pp.515-524
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• 2022

본 연구에서는 예비초등교사의 '과학 창의성'과 '과학 창의성 교육'에 대한 인식의 연관성을 틀 내 및 틀 간 창의성을 중심으로 탐색하였다. 틀 내 창의성은 패러다임 내에서 작동하는 이론적 창의성과 실험적 창의성으로 구분되고, 틀 간 창의성을 패러다임의 변화를 가져오는 이론적 창의성을 의미한다. 자료 수집은 심층 면담으로 이루어졌으며, 분석은 틀 내 및 틀 간 범주를 토대로 수행되었다. 연구결과, 예비초등교사들은 주로 틀 내 창의성의 관점에서 '과학 창의성'을 인식하고 있었다. 또한 이들은 '과학 창의성'을 틀 내 창의성 관점에서 실험적 창의성과 이론적 창의성의 관점에서 다양하게 생각하고 있었다. 반면 예비초등교사들은 '과학 창의성 교육'은 틀 내 실험적 창의성의 관점에서 가능하다고 인식하고 있었다. 이러한 결과를 바탕으로 과학 교육에서 고려할 수 있는 과학 창의성의 특성과 이를 위한 과학교육의 방향에 대해서 논의하고자 한다.

• 전자공학회논문지CI
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• 제40권3호
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• pp.137-143
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• 2003

Key frame extraction has been recognized as one of tile important research issues in video information retrieval. Although progress has been made in key frame extraction, the existing approaches do not evaluate the importance of extracted frame Quantitatively, and Dey are computationally expensive or ineffective. In this Paper, we introduce a new 미해rithm for key frame extraction using shot coverage and distortion. The algorithm finds significant key frames from candidate key frames. When selecting the candidate frames, the coverage rate to the total frames from each frame is computed by using the difference between the adjacent frames in tile shot. The frames within 10$\%$ from the top are selected as the candidates. Then, by comfuting the distortion rate of the candidates against all frames, pick the frames which arc most representative are selected. The performance of the proposed algorithm has been verified by a statistical test. Experiments show that more than 13-50$\%$ improvement has been obtained by the proposed algorithm compared to the existing methods.

• 한국콘텐츠학회논문지
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• 제16권7호
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• pp.221-230
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• 2016

대다수의 국민은 부동산정책을 접할 때 정부의 보도자료 보다는 언론기사를 주로 접하며 정보를 얻는다. 하지만 이러한 정보는 언론사의 성향과 독자의 계층에 따라 다른 프레임으로 전달 될 수 있다. 언론사는 정부의 부동산 정책에 대하여 언론사의 성향에 따라 기대와 찬성 또는 우려와 비판의 프레임으로 기사를 보도한다. 따라서 어떤 성향의 언론보도를 접하느냐에 따라 국민의 부동산 정책에 대한 기대와 우려는 바뀌게 될 가능성이 있다. 본 연구에서는 정부의 부동산 정책이 언론사의 성향에 따라 어떤 프레임을 가지고 신문보도에 투영되는지 '부동산 3법에 대한 여야합의 및 국회통과'와 관련된 기사를 분석하여 살펴보았다. 분석결과 보수성향의 언론사는 부동산 3법의 국회통과에 대하여 긍정적 논조의 보도 및 정책에 대한 호의적 전망 프레임의 비율이 높았고, 진보성향의 언론사는 국회통과에 대한 중립적 또는 부정적 논조의 보도 및 정책에 대한 부정적 전망 프레임의 비율이 높은 것으로 나타났다. 이를 통하여 부동산 정책과 관련하여 여야가 합의한 사안이라 하더라도 보수와 진보로 구분되는 언론매체들 사이에 보도프레임에 대하여 차이가 존재하고 있다는 것을 확인하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권6호
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• pp.1209-1221
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• 2010

Three dimensional (3D) video is expected to be an important application for broadcast and IP streaming services. One of the main limitations for the transmission of 3D video over IP networks is network bandwidth mismatch due to the large size of 3D data, which causes fatal decoding errors and mosaic-like damage. This paper presents a novel selective frame discard method to address the problem. The main idea of the proposed method is the symmetrical discard of the two dimensional (2D) video frame and the depth map frame. Also, the frames to be discarded are selected after additional consideration of the playback deadline, the network bandwidth, and the inter-frame dependency relationship within a group of pictures (GOP). It enables the efficient utilization of the network bandwidth and high quality 3D IPTV service. The simulation results demonstrate that the proposed method enhances the media quality of 3D video streaming even in the case of bad network conditions.

• Progress in Superconductivity
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• 제13권1호
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• pp.52-57
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• 2011

A superconductor flywheel energy storage system (SFES) is an electro-mechanical battery which transforms electrical energy into mechanical energy for storage, and vice versa. The 35 kWh class SFES is composed of a main frame, superconductor bearings, electro-magnetic dampers, a motor/generator, and a composite flywheel. The energy storing capacity of the SFES can be limited by the operational speed range of the system. The operational speed range is limited by many factors, especially the resonant frequency of the main frame and flywheel. In this study, a steel frame has been designed and constructed for a 35 kWh class SFES. All the main parts, their housings, and the flywheel are aligned and assembled on to the main frame. While in operation, the flywheel excites the main frame, as well as all the parts assembled to it, causing the system to vibrate at the rotating speed. If the main frame is excited at its resonant frequency, the system will resonate, which may lead to unstable levitation at the superconductor bearings and electro-magnetic dampers. The main frame for the 35 kWh class SFES has been designed and constructed to improve stiffness for the stable operation of the system within the operational speed range.

• Structural Engineering and Mechanics
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• 제56권4호
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• pp.569-588
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• 2015

A comprehensive methodology is proposed for design of metallic dampers in seismic retrofit of earthquake-damaged frame structures. It is assumed that the metallic dampers remain elastic and only provide stiffness during frequent earthquake (i.e., earthquake with a 63% probability of exceedance in 50-year service period), while in precautionary earthquake (i.e., earthquake with a 10% probability of exceedance in 50-year service period), the metallic dampers yield before the main frame and dissipate most of the seismic energy to either prevent or minimize structural damages. Therefore by converting multi-story frame to an equivalent single-degree-of-freedom system, the added stiffness provided by metallic dampers is designed to control elastic story drifts within code-based demand under frequent earthquake, and the added damping with the combination of added stiffness influences is obtained to control structural stress within performance-based target under precautionary earthquake. With the equivalent added damping ratio, the expected damping forces provided by metallic dampers can be calculated to carry out the configuration and design of metallic dampers along with supporting braces. Based on a detailed example for retrofit of an earthquake-damaged reinforced concrete frame by using metallic dampers, the proposed design procedure is demonstrated to be simple and practical, which can not only meet current China's design codes but also be used in retrofit design of earthquake-damaged frame with metallic damper for reaching desirable performance objective.

• 한국멀티미디어학회논문지
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• 제17권7호
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• pp.797-805
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• 2014

In this paper we propose a new frame rate up conversion scheme which is used to overcome the motion blur problem of liquid crystal display caused by its slow response. The conventional bilateral motion estimation method which is mainly used in the frame rate up conversion scheme has a drawback that it cannot find true motion vector if there are blocks with simple texture in the search range. To solve this problem, a texture adaptive bilateral motion estimation method that increases cost value of block with simple texture is proposed. Also a motion estimation scheme that utilizes neighboring motion vector effectively is proposed to reduce computation time required to estimate motion. Since the proposed scheme does not apply all available motion vectors within the search range, the execution time of frame rate up conversion can be reduced dramatically. Experimental results show that the interpolated frame image quality of the proposed method is improved in subjective as well as objective view point compared with that of the conventional method.