• 한국멀티미디어학회논문지
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• 제12권2호
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• pp.244-256
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• 2009

본 논문에서는 모바일 3D 콘텐츠들의 저작권 보호 및 불법복제 방지를 위한 다중 워터마킹기법을 제안한다. 제안한 방법에서는 익명 Buyer-Seller 워터마킹 프로토콜 기반으로 모바일 3D콘텐츠의 공간 영역 및 암호화 영역 상에서 단일 워터마크 및 WCA 워터마크를 삽입한다. 우선, 판매자는 단일 워터마크를 생성하여, 이를 3D콘텐츠 객체의 꼭지점 데이터 분포 상에 삽입한다. 그리고 WCA에서 전달받은 암호화된 워터마크를 암호화된 꼭지점 데이터에 준동형 특성을 이용한 연산자에 의하여 삽입한다. 본 실험에서는 모바일 콘텐츠 개발툴인 PowerVR MBX 상에서 제안한 방법을 구현하였다. 실험 결과로부터 제안한 방법이 모바일 3D 콘텐츠의 저작권 보호 및 불법 복제 방지가 가능함을 확인하였으며, 잡음첨가, 데이터 정밀도 가변, 확대, 축소 등의 공격에 대하여 워터마크가 검출됨을 확인하였다.

• 한국멀티미디어학회논문지
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• 제12권3호
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• pp.427-435
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• 2009

사용자들은 웹 콘텐츠의 세부 내용단위인 메뉴, 로그인, 뉴스, 동영상 등 다양한 아이템에서 자신이 홍미있는 아이템을 찾아 읽고 아이템에 연결된 하이퍼렁크를 클릭한다. 모바일 디바이스처럼 작은 스크린에서는 데스크탑 기반의 웹 콘텐츠를 동시에 보여주기 힘들어 사용자는 좌우 또는 상하 스크롤링을 통해 아이템을 찾아 헤매는 검색의 불편함이 발생한다. 사용자가 자주 사용하거나 또는 원하는 아이템을 찾아 먼저 표현하여 모바일 인터페이스 조작의 불편함을 감소시킬 수 있다. 그러기 위해 웹 콘텐츠는 세부 내용단위인 아이템 별로 세그먼트되어야 한다. 기존 대부분의 세그먼트 알고리즘들은 웹 콘텐츠의 HTML 코드와 모바일 사이즈에 기반하여 세그먼트하고 있어 다양한 아이템들이 구조적으로 더욱 복잡하게 형성되고 있는 현대의 웹 콘텐츠에서 내용 단위인 아이템 블록으로 세그먼트하는데 여러 어려움이 있다. 본 논문에서는 데스크탑 웹 콘텐츠에서 내용 단위에 기반한 아이템 블록 추출을 위한 세그먼트 알고리즘을 제안한다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.1095-1098
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• 2009

Stereoscopic (3D) content must be viewable in a variety of visual environments, from 3D theaters to 3D mobile displays. However, the depth sensations provided by 3D media are affected by the viewing conditions, such as screen size, viewing distance, and other factors. This user experience (UX) aspect makes it difficult to create multi-purpose 3D content. This paper describes two study cases in which the authors have focused on the UX and the multi-purposing of 3D content. The first case is an evaluation of 3D image quality on a mobile display. The second case is a trial development of a scalable 3D conversion process.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2008년도 춘계 종합학술대회 논문집
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• pp.469-472
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• 2008

무선 단말기는 유비쿼터스 환경을 위한 최적의 장치지만 무선단말기를 이용한 인터넷 서비스는 데스크탑 환경에 비해 제한적이다. 무선 단말기의 작은 화면이나 제한된 입력장치와 같은 특성을 고려해 볼 때 효과적인 웹 접근을 위한 새로운 기법이 요구되고 있다. 본 논문에서는 메일진 서비스인 KISTI의 과학향기 콘텐츠의 모바일 서비스 구현 사례를 통해 모바일 환경에 적합한 과학기술정보 콘텐츠 제공 방안을 제안하고자 한다.

• 여성건강간호학회지
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• 제29권3호
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• pp.190-199
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• 2023

Purpose: This study aimed to describe the characteristics of mobile applications (apps) related to pregnancy in South Korea and evaluate their quality. Methods: We conducted a systematic search for pregnancy-related apps available in Korea in two app stores as of April 29, 2022. The quality of apps was assessed using the Korean translation of the Mobile Application Rating Scale for objective quality with four subdomains (engagement, function, aesthetics, and information) and four items for subjective quality. Results: In total, 163 apps were selected and reviewed. Both the objective and subjective quality of the apps were found to be desirable, with scores exceeding 3 out of 5 (range, 34-82). All subdomain scores in the objective quality assessment were also desirable. Among the four objective quality subdomains, aesthetics received the highest scores, followed by information, function, and engagement. In terms of subjective quality, the scores for a comprehensive overall evaluation, continuous use, and recommendation exceeded 3 out of 5, with the exception of payment. Only a small number of apps (n=4, 2.9%) were backed by a reliable authority, such as an expert review. Significant differences were observed in the objective quality of apps across different content categories (F=3.86, p=.003). Conclusion: Most pregnancy-related apps had desirable levels of objective and subjective quality. However, app content experts seldom provide reviews. It is crucial for nurses to recommend apps to expectant mothers that offer dependable content, regularly updated with the latest information.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
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• pp.31-34
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• 2005

Mobile devices, such as PDAs, portable multimedia players, are more likely to encompass large storage devices with prevalance of high-quality multimedia contents. This paper proposes an object-based multimedia contents storage architecture that employs the object-based storage device model and the iSCSI protocol. It also provides a multimedia content player that operates directly with the proposed storage architecture. We implement both the proposed storage architecture and the multimedia content player upon the Linux environment. Performance evaluation by playing MP3 multimedia contents reveals that the proposed storage architecture reduces the total power consumption by 9%, compared with an existing networked storage. This enhancement is mainly contributed to the fact that a large portion of the file system is moved into the object-based multimedia contents storage from the mobile device.

• 중소기업융합학회논문지
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• 제5권3호
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• pp.21-26
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• 2015

모바일 컨텐츠가 성장함에 따라 모바일 컨텐츠가 있는 애플리케이션에서 인앱 결제가 활발하다. 하지만 이용자들 중 정당하게 돈을 지불하고 이용하지 않고 결제 모듈을 속이거나 해킹하는 애플리케이션을 통해 유료 컨텐츠를 무료로 이용하고 있다. 이를 결제 우회라고 부른다. 결제 우회를 돕는 애플리케이션에는 프리덤(Freedom), 아이앱 크래커(IAP Cracker), 그리고 보로딘이라는 해커가 제시한 DNS 서버가 있다. 모바일 게임의 경우 결제 우회를 사용한 이용자들 때문에 유료 컨텐츠를 팔았음에도 매출 로그에 나온 결제 금액과 실제 수익으로 돌아오는 금액이 다르다. 결제 우회에 대응 방안으로 구매 번호 형태 확인, 공개 키 암호화, 영수증 검증 세 가지를 제안한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권9호
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• pp.3635-3654
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• 2015

With the rapid development of smart devices and mobile Internet, the video application plays an increasingly important role on mobile devices. Understanding user behavior patterns is critical for optimized operation of mobile live streaming systems. On the other hand, volume based billing models on cloud services make it easier for video service providers to scale their services as well as to reduce the waste from oversized service capacities. In this paper, the watching behaviors of a commercial mobile live streaming system are studied in a content-centric manner. Our analysis captures the intrinsic correlation existing between popularity and watching intensity of programs due to the synchronized watching behaviors with program schedule. The watching pattern is further used to estimate traffic volume generated by the program, which is useful on data volume capacity reservation and billing strategy selection in cloud services. The traffic range of programs is estimated based on a naive popularity prediction. In cross validation, the traffic ranges of around 94% of programs are successfully estimated. In high popularity programs (>20000 viewers), the overestimated traffic is less than 15% of real happened traffic when using upper bound to estimate program traffic.

• 여성건강간호학회지
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• 제27권3호
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• pp.243-255
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• 2021

Purpose: This study aimed to develop a lifestyle modification (LSM) mobile application based on the Android operating system for overweight and obese breast cancer survivors (BCS) in Korea and evaluate its usability. Methods: The content analysis, design, development, implementation, and evaluation of the LSM intervention mobile application for overweight and obese BCS was conducted by identifying survivors' needs, searching the literature, and reviewing existing mobile applications. The survey was conducted from June 1 to December 28, 2020 at Jeonju, Korea. Results: The mobile application for BCS included dietary and exercise information, weight logs, as well as distress and daily achievement check. It also included information and videos on the prevention of breast cancer recurrence and used a communication bulletin board. Expert and user usability evaluation of its content and functions confirmed that it was appropriate and satisfactory for overweight and obese BCS. Conclusion: This LSM mobile application developed for overweight and obese BCS was found to be appropriate for use. It can be applied for further study of effectiveness on improving their health and maintaining a healthy lifestyle, to ultimately improve quality of life.

• International Journal of Internet, Broadcasting and Communication
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• 제13권1호
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• pp.54-60
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• 2021

AR (Augmented Reality) is a technology that provides virtual content to the real world and provides additional information to objects in real-time through 3D content. In the past, a high-performance device was required to experience AR, but it was possible to implement AR more easily by improving mobile performance and mounting various sensors such as ToF (Time-of-Flight). Also, the importance of mobile augmented reality is growing with the commercialization of high-speed wireless Internet such as 5G. Thus, this paper proposes a system that can provide AR services via GNN (Graph Neural Network) using cameras and sensors on mobile devices. ToF of mobile devices is used to capture depth maps. A 3D point cloud was created using RGB images to distinguish specific colors of objects. Point clouds created with RGB images and Depth Map perform downsampling for smooth communication between mobile and server. Point clouds sent to the server are used for 3D object detection. The detection process determines the class of objects and uses one point in the 3D bounding box as an anchor point. AR contents are provided through app and web through class and anchor of the detected object.