• 한국의류산업학회지
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• 제16권5호
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• pp.730-744
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• 2014

With advances in QR code, mobile is becoming one of important channels in the fashion retail industries. This study attempts to understand the importance of QR code utilization in creating multi-channel business model. Study objectives are to classify types of multi-channel retailing by QR code utilization and to explore the role of QR code technology in strategic marketing elements for types of multichannel retailer. As an exploratory approach, a total of 78 news articles regarding QR code issues were reviewed and analyzed by focusing on 48retailers seleted in this study. The results found seven dimensions of QR code marketing strategies: abundant product information, additional information contents, transaction accessibility, connectedness to channels, location based service, loyalty program and multimedia advertising. Based a combination of channels and level of mobile apps' activation, multichannel retailers utilizing QR code technology were classified into four types; bricks-click-active mobile model, bricks-click-inactive mobile model, bricks-click model, and click-active mobile model. There were differences of using QR code marketing strategies among multichannel models. According to results, for bricks-and-mortar retailers, QR code was critical to integrate shopping experience with merchandise or sales promotions across channels. In addition, for non-store retailers, the QR code utilization was successful in expanding mobile channels, which can promote retail sales by a two-way interaction with customers via the mobile apps.

• 한국멀티미디어학회논문지
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• 제19권2호
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• pp.411-417
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• 2016

Since the development of Graphic Processing Unit (GPU) in 1999, the development speed of GPUs has become much faster than that of CPUs and currently, the computational power of GPUs exceeds CPUs dozens and hundreds times in terms of decimal calculations and costs much less. Owing to recent technological development of hardwares, general-purpose computing and utilization using GPUs are on the rise. Thus, in this paper, we have identified the elements to be considered for the Smart Grid Security. Focusing on a Performance Improvement of the Basic Algorithm for the Stateful Inspection to Detect DDoS Attacks using CUDA. In the program, we compared the search speeds of GPU against CPU while they search for the suffix trees. For the computation, the system constraints and specifications were made identical during the experiment. We were able to understand from the results of the experiment that the problem-solving capability improves when GPU is used. The other finding was that performance of the system had been enhanced when shared memory was used explicitly instead of a global memory as the volume of data became larger.

• 한국멀티미디어학회논문지
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• 제14권2호
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• pp.295-306
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• 2011

기존의 응급의료시스템은 환자에 대한 정확한 임상정보의 획득이 불가능하여 전문 응급 처치의 대부분이 병원 내에서 행해지고 있다. 이에 본 논문에서는 후송과정에서의 정확한 응급처치를 위해 의료 정보 표준안인 HL7을 기반으로 응급의료 환경에 적합한 의료정보 전달구조를 설계하였다. 설계한 시스템은 표준화된 HL7 메시지를 통해 병원의 의료정보시스템과 영상정보 및 응급의료정보를 공유할 수 있다. 따라서 병원 이송 단계에서 생체 데이터와 과거 환자의 임상정보를 바탕으로 정확한 응급 처치가 가능하다. 또한 본 논문의 시스템은 다른 의료관련 서비스(원격진료, 공동진료, 화상의료회의 등)와의 효율적인 연동을 위해 모든 가능 모듈을 서비스 플랫폼 OSGi를 기반으로 구현하였다.

• 한국멀티미디어학회논문지
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• 제4권3호
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• pp.197-204
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• 2001

공간 데이타베이스 시스템의 성능을 향상시키기 위해서는 동적 및 정적 환경에서 발생하는 공간객체를 효율적으로 관리할 수 있는 공간색인방법이 필요하다. 그리고 검색의 성능을 높이기 위해서는 공간국부성을 고려한 공간색인 방법이 요구되며, 공간국부성은 객체들의 위치 속성과 관계가 있다. 기존의 공간색인 방법들에서는 객체가 가질 수 있는 순환적인 위치 속성이 고려되지 않았다. 본 논문에서는 순환 및 선형 도메인들로 구성된 검색공간에서 공간적으로 이웃하는 객체들을 결집시키기 위한 공간색인구조인 CR-트리를 소개한다. 그리고 객체의 순환적인 위치 속성을 고려한 공간색인구조를 사용함으로써 적중률 및 버켓이용률을 향상시킬 수 있음을 실험을 통하여 보인다

• 한국멀티미디어학회논문지
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• 제2권1호
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• pp.22-29
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• 1999

주문형 비디오 시스템에서 영화는 다중 엑세스를 지원하기 위하여 비디오 서버의 디스크 배열에 스트라이프 된다. 영화의 블록들은 비디오 서버의 디스크 배열들간의 부하 불균형을 피할 뿐만 아니라 저장 공간과 장치 대역폭을 최대로 이용하기 위하여 비디오 서버의 디스크 배열에 신중히 배치되어야 한다. 본 논문에서는 영화의 인기도를 고려한 동적 디스크 스트라이핑에 기초한 그룹교대 라운드로빈(GARR: group-alternation round-robin)이라 부르는 영화 배치 방법을 제안한다. GARR은 영화 선택 정책으로 그룹교대와 영화 배치정책으로 라운드로빈을 사용한다. 여기서 그룹교대는 인기 영화 그룹과 비인기 영화의 그룹을 교대로 디스크에 할당한다. GARR의 성능은 시뮬레이션을 통하여 평가된다.

• 한국멀티미디어학회논문지
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• 제18권11호
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• pp.1367-1374
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• 2015

In this paper, we propose a model which can prioritize the performance improvement work by analyzing the major risks and their influence, which can cause performance degradation in the system and show an example of a performance improvement using this model. In presentation-tier, as a result of log data analysis before and after the performance improvement of key processes which handle financial transactions, this model brought the CPU utilization and memory enhancement in the performance improvement work of the financial system which was carried out by applying the proposed model. It has been confirmed that the entire end-user can be accommodated. In the web-tier, the available memory increased by 200MB and we were able to improve the server restart(Recycling) that was sustained in the existing system. In the business logic-tier, we have been able to see better figures after performance improvements through the graph which analyzes the log collected with the key performance counters such as CPU%, Batch Requests/sec. In the data-tier, it has been confirmed that CPU usage and standby operation were reduced and the throughput was found to increase.

• 한국멀티미디어학회논문지
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• 제10권12호
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• pp.1632-1644
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• 2007

Wireless Mesh Networks aim to attain large connectivity with minimum performance degradation, as network size is increase. As such, scalability is one of the main characteristics of Wireless Mesh Networks that differentiates it from other wireless networks. This characteristic creates the need for bandwidth efficiency strategies to ensure that network performance does not degrade as the size of the network increase. Several researches have been done to realize mesh networks. However, the researches conducted were mostly focused on a per TCP/IP layer basis. Also, the studies on bandwidth efficiency and bandwidth improvement are usually dealt with as separate issues. This paper aims to simultaneously study bandwidth efficiency and improvement. Aside from optimizing the bandwidth given a fixed capacity, the capacity is also increased using results of physical layer studies. In this paper, the capacity is improved by using the concept of non-overlapping channels for wireless communication. A channel allocation scheme is conceptualized to choose the transmission channel that would optimize the network performance parameters with consideration of chosen Quality of Service (QoS) parameters. Network utility maximization is used to optimize the bandwidth after channel selection. Furthermore, a routing scheme is proposed using the results of the network utilization method and the channel allocation scheme to find the optimal path that would maximize the network gain.

• 한국멀티미디어학회논문지
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• 제23권3호
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• pp.395-401
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• 2020

In this paper, a motion-based ROI extraction algorithm from a high resolution fisheye image is proposed for multi-view monitoring systems. Lately fisheye cameras are widely used because of the wide angle-of-view and they basically provide a lens correction functionality as well as various viewing modes. However, since the distortion-free angle of conventional algorithms is quite narrow due to the severe distortion ratio, there are lots of unintentional dead areas and they require much computation time in finding undistorted coordinates. Thus, the proposed algorithm adopts an image decimation and a motion detection methods, that can extract the undistorted ROI image with a standard angle-of-view for the fast and intelligent surveillance system. In addition, a mesh-type ROI is presented to reduce the lens correction time, so that this independent ROI scheme can parallelize and maximize the processor's utilization.

• 한국멀티미디어학회논문지
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• 제7권3호
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• pp.340-348
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• 2004

본 논문에서는 단일의 전송매체를 여러 스테이션이 사용하기 위한 효율적인 매체접속제어 방식을 제안하였다. 매체접속제어 방식은 크게 예약방식과 충돌 허용방식으로 구분되며 네트워크 환경에 따라 각각의 방식이 효율성에서 장점을 지닌다. 제안된 매체접속제어 방식은 충돌 허용방식인 CSMA/CD를 기본으로 하며 충돌현상을 지연하여 채널을 예약하는 기능을 부가하였다. 따라서 충돌이 발생하면 예약과정을 거쳐 채널에는 예약에 성공한 스테이션만 경쟁에 참여하게 되어 매체접속 확률을 높이게 된다. 제안된 프로토콜은 충돌의 횟수가 감소하여 전체적으로 채널의 활용도가 향상되는 것을 시뮬레이션으로 확인하였다.

• 한국멀티미디어학회논문지
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• 제23권1호
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• pp.93-101
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• 2020

Korea, as a leader of Internet and game sector in IT industry, has been playing an important role in increasing its industrial development. This country has won the first place in wireless broadband usage and contributed to Internet game industry development. This means that Korean use smartphones most. It is juveniles that use Internet and smartphones most among Korean who use teenage., the number of the teenagers who overuse smartphones or Internet has surpassed 200,000. The number of the adolescents who spend more time using smartphone and Internet is about 180,000 and the number of the teens who are over-dependent to smartphone having trouble living their lives is over 22,000. The SNS usage rate of the contents that teens are most likely to use has accounted for over 80 percent. Among teens, SNS is being considered as a major means that builds relationship due to smartphone technology and the prevalence of smartphones. However, the use of SNS among youths has two sides; one is positive, the other negative. Not only does SNS have a positive function that it keeps relationship but it also has a negative function that it can lead to smartphone addiction.