• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2003년도 추계종합학술대회 논문집
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• pp.124-127
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• 2003

본 연구에서는 이동환경 하에서 멀티미디어 콘텐츠를 서비스하기 위한 워터마킹 기법을 제안한다. 제안한 기법은 경로손실, 페이딩, 간섭 및 잡음이 존재하는 이동환경 하에서 발생하는 에러에 강인하도록 설계되었다. 이동환경 하에서 멀티미디어 콘텐츠를 서비스할 경우 저작권 보호를 위해 고려해야 할 중요사항들과 워터마크의 구성, 삽입 및 검출 위치에 대한 가능한 방법들도 제안한다. 워터마크는 이동 사용자의 정보를 이용해 구성해야 하며 워터마크의 삽입과 검출은 주파수 영역에서 CDMA 기술을 이용하여 수행해야만 한다는 것을 알 수 있었다.

• IEIE Transactions on Smart Processing and Computing
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• 제5권5호
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• pp.323-326
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• 2016

High Efficiency Video Coding (HEVC) adopts intra transform skip mode, in which a residual block is directly quantized in the pixel domain without transforming the block into the frequency domain. Intra transform skip mode provides a significant coding gain for screen content. However, when intra-prediction errors are not transformed, the errors are often correlated along the intra-prediction direction. This paper introduces a residual differential pulse code modulation (DPCM) method for the intra-predicted and transform-skipped blocks to remove redundancy. The proposed method performs pixel-by-pixel residual prediction along the intra-prediction direction to reduce the dynamic range of intra-prediction errors. Experimental results show that the transform skip mode's Bjøntegaard delta rate (BD-rate) is improved by 12.8% for vertically intra-predicted blocks. Overall, the proposed method shows an average 1.2% reduction in BD-rate, relative to HEVC, with negligible computational complexity.

• 한국정보교육학회:학술대회논문집
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• 한국정보교육학회 2004년도 동계학술대회
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• pp.45-55
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• 2004

본 논문은 교사의 Multimedia Literacy 함양을 위한 원격교육 Contents를 제작함에 있어 효율적으로 활용할 수 있는 상호작용 구현 방안을 제시함을 목적으로 한다. 이에 앞서 본 논문에서는 웹 기반 원격교육 상호작용 유형과 그 구현 방안을 새롭게 정리해 보고, 효율적인 원격교육과 상호작용 구현을 위해 고려해야 할 사항에 대한 제안을 통해 논지에 접근하였다. 본 논문은 연구 범위를 교사의 멀티미디어 리터러시 함양을 위한 원격교육 Contents에서의 Learner - Contents Interaction으로 제한하였으며, Java Script, Hash, HTML의 Event, Action, Link, Navigation 등을 활용한 Courseware 개발에 주력하였다. 상호작용이 강화된 이 Courseware는 Open Contents System으로 구축되어 다양한 원격교육 Contents에 다각도로 활용 가능하다.

• 한국멀티미디어학회논문지
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• 제19권4호
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• pp.765-773
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• 2016

As multimedia content technology developed, there are many cases that service contents are being provided in many different ways in the cloud-based media service system. A DRM is a technology that can enhance the copyright of the digital content by providing right information. It is available on a single platform and has a problem that the additional cost when the platform is changing. In this paper, we propose a media service system based on cloud computing. It can be used on multiple platforms at the same time by applying a number of DRM for digital contents, and allows use of a new authentication for another platform without any additional cost.

• 한국멀티미디어학회논문지
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• 제24권8호
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• pp.1090-1100
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• 2021

Recently, as indoor activities increase due to the spread of infectious diseases, the metaverse is attracting attention. Metaverse refers to content in which the virtual world and the real world are closely related, and its representative platform technology is VR(Virtual Reality). However, since VR hardware is difficult to access in terms of cost, the concept of streaming-based cloud VR has emerged. This study proposes a server configuration and deployment method in an edge network when metaverse content involving multiple users operates based on cloud VR. The proposed algorithm deploys the edge server in consideration of the network and computing resources and client location for cloud VR, which requires a high level of computing resources while at the same time is very sensitive to latency. Based on simulation, it is confirmed that the proposed algorithm can effectively reduce the total network traffic load regardless of the number of applications or the number of users through comparison with the existing deployment method.

• International Journal of Advanced Culture Technology
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• 제11권2호
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• pp.403-408
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• 2023

The widespread discussion of AI-generated content, fueled by the emergence of consumer applications like ChatGPT and Midjourney, has attracted significant attention. Among various AI applications, AI painting has gained popularity due to its mature technology, user-friendly nature, and excellent output quality, resulting in a rapid growth in user numbers. Midjourney and Stable Diffusion are two of the most widely used AI painting tools by users. In this study, the author adopts a perspective that represents the general public and utilizes case studies and comparative analysis to summarize the distinctive features and differences between Midjourney and Stable Diffusion in the context of AI character illustration. The aim is to provide informative material forthose interested in AI painting and lay a solid foundation for further in-depth research on AI-generated content. The research findings indicate that both software can generate excellent character images but with distinct features.

• ETRI Journal
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• 제36권2호
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• pp.197-205
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• 2014

This paper proposes a novel framework for virtual content delivery networks (CDNs) based on cloud computing. The proposed framework aims to provide multimedia content delivery services customized for content providers by sharing virtual machines (VMs) in the Infrastructure-as-a-Service cloud, while fulfilling the service level agreement. Furthermore, it supports elastic virtual CDN services, which enables the capabilities of VMs to be scaled to encompass the dynamically changing resource demand of the aggregated virtual CDN services. For this, we provide the system architecture and relevant operations for the virtual CDNs and evaluate the performance based on a simulation.

• 한국멀티미디어학회논문지
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• 제19권8호
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• pp.1597-1608
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• 2016

Recently, a number of solutions were proposed to address the challenges and issues of vehicular networks. Vehicular Cloud Computing (VCC) is one of the solutions. The vehicular cloud computing is a new hybrid technology that has a remarkable impact on traffic management and road safety by instantly using vehicular resources. In this paper, we study an important vehicular cloud service, content-based delivery, that allows future vehicular cloud applications to store, share and search data totally within the cloud. We design a VCC-based system architecture for efficient sharing of vehicular contents, and propose a Hierarchical Hybrid Content Delivery scheme using Bloom Filter (H2CDBF) for efficient vehicular content delivery in Vehicular Ad-hoc Networks (VANETs). The performance of the proposed H2CDBF is evaluated through an analytical model, and is compared to the proactive content discovery scheme, Bloom-Filter Routing (BFR).

• 한국멀티미디어학회논문지
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• 제20권2호
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• pp.429-436
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• 2017

This study was attempted to improve the utilization of kiosk DID and to establish the production direction of the kiosk DID to be developed in the future, through analysis of kiosk DID user satisfaction at bus stop. This study showed that the satisfaction of the usability of the bus stop kiosk DID was high but in order to enhance the active use of kiosk DID and user satisfaction, unique and interesting content needs to be added and switched, not just simple information but content that users will immerse.

• ETRI Journal
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• 제26권2호
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• pp.136-148
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• 2004

It is expected that an intelligent broadcasting service (IBS) will be able to provide broadcast programs based on user preference and program-associated information (metadata) in order to assist users in easy navigation of the program content being broadcast. In this way, users will be able to access program content anytime, anywhere, and in the manner they wish. This type of IBS will be a basis for future broadcasting services such as customized broadcasting or personal casting. In this paper, we introduce an agent-based multimedia broadcasting framework using the Foundation for Intelligent Physical Agents (FIPA) and MPEG-7 technologies within MPEG-21. We use a FIPA implementation called FIPA open source as a platform for exchanging user preferences and program information as FIPA messages between a server and its clients. The user preference is modeled as the User Preference description scheme in MPEG-7 multimedia description schemes. We discuss a framework structure and implementation for the IBS.