• 한국멀티미디어학회논문지
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• 제25권8호
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• pp.1085-1096
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• 2022

The manufacturing industry is continuously pursuing advanced technology and smartization as it converges with innovative technology. Improvement of manufacturing productivity is achieved by monitoring, analyzing, and controlling the facilities and processes of the manufacturing site in real time through a network. In this paper, we proposed a new OPC-UA based digital twin model for smart factory facilities. A testbed system for USB flash drive packaging facility was implemented based on the proposed digital twin model and OPC-UA data communication scheme. Through OPC-UA based digital twin model, equipment and process status information is transmitted and received from PLC to monitoring and control 3D digital models and physical models in real time. The usefulness of the developed digital twin testbed system was evaluated through usability test.

• 한국컴퓨터산업학회논문지
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• 제2권12호
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• pp.1505-1516
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• 2001

The goal of Medical multimedia server is to develop computer hardware and software which would enable electronic access, storage, transmission, and display of patient data and images. Since the current network only provides so called "best-effort" services, it is impossible to satisfy QoS guarantee that is required for real time application services for emergency room, operating room etc. Accordingly, world-wide research is being made for a variety of services to provide QoS. he goal of DiffServ is to offer scalable differentiated service in Internet which are made possible by traffic classification and conditioning only performed at an edge(or a boundary) node. In case DiffServ was deployed in the Medical multimedia network, it is difficult to estimate how the QoS mechanism would affect totally the network performance. Therefore, we need to verify by simulation the design of algorithm which provide a variety of differentiated services. In QoS for Medical multimedia network, a simulator is designed and implemented using OPNET to investigate the performance of DiffServ QoS support mechanism. The developed DiffServ simulator may generate packets according to random, and bursty traffic models in order to incorporate diverse traffic conditions in the Medical multimedia network environment. Based on our simulation results, we confirmed that service differentiation is possible by using the EF(Expedited Forwarding) class in DiffServ networks.

• ETRI Journal
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• 제28권4호
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• pp.411-424
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• 2006

This paper presents a multimedia streaming platform for efficiently transmitting MPEG-4 content over IP networks. The platform includes an MPEG-4 compliant streaming server and client, supporting object-based representation of multimedia scenes, interactivity, and advanced encoding profiles defined by the ISO standard. For scalability purposes, we employ an application-layer multicast scheme for media transmission using overlay networks. The overlay network, governed by the central entity of the network distribution manager, is dynamically deployed according to a set of pre-defined criteria. The overlay network supports both broadcast delivery and video-on-demand content. The multimedia streaming platform is standards-compliant and utilizes widespread multimedia protocols such as MPEG-4, real-time transport protocol, real-time transport control protocol, and real-time streaming protocol. The design of the overlay network was architected with the goal of transparency to both the streaming server and the client. As a result, many commercial implementations that use industry-standard protocols can be plugged into the architecture relatively painlessly and can enjoy the benefits of the platform.

• 한국컴퓨터정보학회논문지
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• 제11권5호
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• pp.139-148
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• 2006

본 논문은 멀티미디어 웹 사이트의 사용성 품질 평가를 위한 품질 기준과 웹 메트릭을 제안하고자 한다. 최근 들어 웹 사이트의 활용이 새로운 기술과 접목되어 산업 전반에 결쳐 다양하게 사용되고 있다. 또한 초고속 통신망이 일반화되면서, 그동안 네트워크의 속도 문제로 제한적으로 사용되었던 멀티미디어의 활용이 증가하면서 멀티미디어 웹 사이트가 증가하는 추세이다. 따라서 본 논문은 기존의 소프트웨어 공학, HCI, 하이퍼미디어 분야에서 연구되어온 HTML기반의 품질 평가의 연구를 멀티미디어 웹 사이트로 확장하고, 멀티미디어 웹 사이트에서 큰 비중을 차지하는 플래시 사용성을 접목하여 새로운 웹 메트릭을 제안하였다. 본 논문에서 제안된 웹 메트릭은 전문가 평가를 통하여 검증을 하였다. 또한 박물관을 도메인으로 하여 웹 어워드 코리아에서 수상한 웹 사이트와 비수상 웹 사이트를 정량적이고 정성적인 품질 평가를 통하여, 운용중인 멀티미디어 웹 사이트의 품질 평가가 가능한 것을 비교 검증하였다. 본 논문으로 향후 고품질의 멀티미디어 웹 사이트 개발의 기반이 될 것이다.

• Journal of Multimedia Information System
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• 제7권2호
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• pp.157-164
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• 2020

Considering the frustration affordability level of college entrants and investigating the frustration tolerance of undergraduates in Shenyang City University, this paper provides the basis for the research of improving frustration tolerance of undergraduates through quantitative research results and applies film therapy to the frustration regulation of college students by discussing the role of film therapy in improving frustration affordability ability of college entrants. This paper has concluded that the necessary of improving the frustration tolerance of college students in Northeast China and the feasibility of the film therapy programs on improving the frustration tolerance of college students in Northeast China. Meanwhile, this paper shows that the principle of film selection in film therapy should be based on the requirements of the aesthetics of the film industry in the IT environment. This paper provides a reference for refining the target of film therapy for film therapists to better apply film and television psychotherapy technology, and a basis for the film therapy activity program; Furthermore, it also has a certain reference significance for film and television media workers.

• 한국멀티미디어학회논문지
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• 제18권12호
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• pp.1432-1438
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• 2015

We present a methodology to detect moving shadows in video sequences, which is considered as a challenging and critical problem in the most visual surveillance systems since 1980s. While most previous moving shadow detection methods used hand-crafted features such as chromaticity, physical properties, geometry, or combination thereof, our method can automatically learn features to classify whether image segments are shadow or foreground by using a deep learning architecture. Furthermore, applying Markov Random Field enables our system to refine our shadow detection results to improve its performance. Our algorithm is applied to five different challenging datasets of moving shadow detection, and its performance is comparable to that of state-of-the-art approaches.

• 한국멀티미디어학회논문지
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• 제22권2호
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• pp.157-166
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• 2019

With the development of medical technology, interest in rehabilitation devices is increasing and various devices are being studied. In particular, devices for speech disorders such as hearing impairment and cleft palate are attracting attention. In general, the nasometer is used for patients with flaccid dysarthria and velopharyngeal incompetence(VPI). However, in the case of the conventional separator type nasometer, that has an acoustic feedback problem between the oral and nasal sounds. In recent, the mask type nasometer has been developed which is insensitive to acoustic feedback. But, still not popularized. In this paper, the nasometer characteristics of the conventional separation type and mask type are analyzed. Also, We were obtained clinical acoustic data from the 6 subjects and examined the significant differences in the structure of the separation type and mask type nasometer. Through experiments, it was confirmed that the measurement was about 3~15% higher in the mask type nasometer than the conventional nasometer having a separator type. Also, We was considered the necessity of nasometer signal processing for acoustic feedback reduction and nasalance calculation optimization.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권3호
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• pp.1674-1688
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• 2019

As environmental pollution and fossil fuel energy problems from fuel vehicle have occurred, the interest of electric vehicle(EV) has increased. EV industry and energy industry have grown dynamically in these days. It is expected that the next generation of primary transportation will be EV, and it is necessary to prepare EV infra and efficient energy management such as EV communication protocol, EV charge station, and smart grid. Those EV and energy industry fields are now on growth. Also, the study and development of them are now in progress. In this paper, distributed charge signal processing software for smart slow and quick EV charge is proposed and designed for dealing with EV charge demand. The software consists of smart slow and quick EV charge schedule engine and EV charge power distribution core. The software is designed to support two charge station types. One is normal EV charge station and the other is bus garage EV charge station. Both two types collect the data from EV charge stations, and then analyze the collected data. The software suggests optimized EV charge schedule and deliveries EV charge power distribution information to power switchboard system, and the designed software is implemented on embedded system. It is expected that the software provides efficient EV charge schedule.

• 한국멀티미디어학회논문지
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• 제10권2호
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• pp.246-259
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• 2007

애니메이션 산업은 디지털콘텐츠산업 전반적인 발전 을 가속화시키며 새로운 고부가가치 산업으로서 IT 산업 등 기간산업과 시너지 효과를 가지며 국내 경제에 활력이 되고 있다. 이에 본 연구는 기존의 제조, 생산시스템에서 효용성이 증명된 주요한 대표적 경쟁력 강화 방안이 애니메이션 제작 기업에서도 탁월한 효용성이 있음을 증명하여 국내 애니메이션 개발 기업들에게 구체적인 경쟁력 강화 방안을 제시하고자 한다. 따라서 기존의 아날로그 제품의 개발프로세스에서 매우 유용한 효과를 가졌던 매커니즘인 동시공정과 이를 위한 팀시스템이 디지털 콘텐츠 관련 기업, 특히 애니메이션 기업에서도 기업의 생산성과 경쟁력에 의미 있는 긍정적 영향을 미치고 있음을 분석하였다. 또한 애니메이션 중소벤처기업들이 채택하고 있는 영업방식과 콘텐츠 개발전략에 따라 기술력 등에 있어서 의미 있는 차이가 존재함을 적용, 분석하였다.

• 디지털콘텐츠학회 논문지
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• 제7권2호
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• pp.83-88
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• 2006

이 논문은 지난 세기 말에 새롭게 등장하여 관심을 집중시켰던 전자책 콘텐츠 산업의 주요 분야와 그 현황을 살펴봄으로써 앞으로의 전망을 예측하였다. 따라서 이 논문에서는 이론적 배경을 바탕으로 전자책 콘텐츠 산업 분야의 여러 기업들에 대한 설문조사를 통하여 현황을 파악한 후, 전자책 콘텐츠산업이 미래의 콘텐츠 수급에 있어서 중요한 역할을 하게 될 것이라는 점을 강조한다.