• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제17권4호
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• pp.238-266
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• 2013

The Interaction Picture (IP) method is a valuable alternative to Split-step methods for solving certain types of partial differential equations such as the nonlinear Schr$\ddot{o}$dinger equation or the Gross-Pitaevskii equation. Although very similar to the Symmetric Split-step (SS) method in its inner computational structure, the IP method results from a change of unknown and therefore do not involve approximation such as the one resulting from the use of a splitting formula. In its standard form the IP method such as the SS method is used in conjunction with the classical 4th order Runge-Kutta (RK) scheme. However it appears to be relevant to look for RK scheme of higher order so as to improve the accuracy of the IP method. In this paper we investigate 5th order Embedded Runge-Kutta schemes suited to be used in conjunction with the IP method and designed to deliver a local error estimation for adaptive step size control.

• IEIE Transactions on Smart Processing and Computing
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• 제5권4호
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• pp.267-273
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• 2016

Hand posture recognition is an important technique to enable a natural and familiar interface in the human-computer interaction (HCI) field. This paper introduces a hand posture recognition method using a depth camera. Moreover, the hand posture recognition method is incorporated with the Moving Picture Experts Group Rich Media User Interface (MPEG-U) Advanced User Interaction (AUI) Interface (MPEG-U part 2), which can provide a natural interface on a variety of devices. The proposed method initially detects positions and lengths of all fingers opened, and then recognizes the hand posture from the pose of one or two hands, as well as the number of fingers folded when a user presents a gesture representing a pattern in the AUI data format specified in MPEG-U part 2. The AUI interface represents a user's hand posture in the compliant MPEG-U schema structure. Experimental results demonstrate the performance of the hand posture recognition system and verified that the AUI interface is compatible with the MPEG-U standard.

• 한국HCI학회논문지
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• 제2권2호
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• pp.27-34
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• 2007

유비쿼터스 컴퓨팅 환경에서는 사용자의 위치에 따라 반응하는 디스플레이의 개발이 필요하다. 본 논문에서는 이러한 앰비언트 디스플레이에 묵시적인 인터랙션을 기반으로 사진을 내비게이션 하는 방법을 제안한다. 제안하는 앰비언트 디스플레이는 RFID를 이용하여 사용자의 신원을 파악하고, 초음파 센서를 이용하여 디스플레이와 사용자 간의 거리를 측정할 수 있다. 사용자가 디스플레이로부터 멀리 떨어져 있을 때에 디스플레이는 디지털 사진 액자처럼 작동하며 사용자의 주의를 필요 이상으로 끌지 않는다. 그러나 사용자가 디스플레이와 인터랙션이 가능한 영역에 진입하면 사용자와 관련된 사진을 디스플레이에 보여주면서, TIP(tour into the picture) 방법을 이용하여 사진속 3차원 공간을 내비게이션 할 수 있도록 하였다. 이밖에도 터치스크린을 이용하여 근거리 인터랙션이 가능하고, 공중 마우스를 이용하여 원거리에서 메뉴를 조작할 수 있다. 또한 응급 상황 발생 시, 디스플레이 프레임에 부착된 LED를 깜빡거림으로써 위급 상황 정보를 사용자에게 알려줄 수 있다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제30권10호
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• pp.925-937
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• 2003

디지털 TV 소프트웨어의 입력은 MPEG-2(Moving Picture Experts Groups-2) 동영상 압축 기술을 이용한 전송 스트림(Transport Stream)이다. MPEG-2 TS는 복잡한 계층 구조와 내부 연관관계를 가지고 있으며, 스트림의 필드 값 결정 시 디지털 TV 소프트웨어의 시스템 규격과 관련된 다양한 제약 사항이 존재한다. 그러나, 일반적인 MPEG-2 스트림 생성 도구들은 MPEG-2 TS 자체의 명세만을 가지고 스트림을 생성하므로 디지털 TV 소프트웨어를 구성하는 모듈의 기능이나 모듈 사이의 상호 작용은 고려하지 않는다. 본 논문에서는 디지털 TV 소프트웨어의 테스트를 위해 체계적으로 테스트 스트림을 생성하는 방법을 제안한다. 또한 제안한 방법을 적용하여 생성한 테스트 스트림을 실제 디지틸 TV 수신기 시스템에 적용한 실험 결과를 제시한다 본 방법을 이용하면 기존의 스트림 생성기와 달리 디지털 TV 소프트웨어의 시스템 테스팅 뿐 아니라, 모듈 및 통합 테스팅을 위한 테스트 스트림의 생성이 가능하며 발견된 오류의 원인 분석이 가능하다.

• The Journal of Asian Finance, Economics and Business
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• 제7권3호
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• pp.177-190
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• 2020

This study aims to present explicit findings from an internal perspective, namely the interaction patterns of marketing communication between pentahelix elements and testing the expectations of tourists towards tourism activities through a simulation model between variables. This study is divided into two methods of analysis, namely qualitative explorative, where the study aims to invest in communication patterns and patterns of interaction between pentahelix stakeholders in Sitiwinangun Tourism Village, West Java, Indonesia with involve 17 informants who came from pentahelix elements (Government, academics, community, business and media). Second, quantitative method to measure the extent of effectiveness rather than collaboration activities and the role of marketing communication to tourist satisfaction is done by an analytical approach involving 30 tourists through customer satisfaction surveys. The results of this study illustrate that the involvement of each pentahelix element has not been maximized. The pattern of interaction and communication between elements also shows the gap between interests, expectations, and reality. This study provides a real picture that to realize a tourism program that is profitable, holistic, and sustainable requires collaboration that is wrapped with transparent and interactive communication patterns. The marketing communication concept approach combined with collaboration theory between stakeholders can be useful for sustainable tourism.

• 경영과학
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• 제32권2호
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• pp.125-143
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• 2015

When studying the film industry, researchers have seldom addressed the dynamic interaction between marketing information and word of mouth in the motion picture industry mainly because of the limitation of traditional research methodologies. This study explores integration and competition among important variables influencing on audience's choice on movie selection, particularly by using a new method of agent-based modeling including competitive environment. Decision process of moviegoer composed of transition probability based on multinomial logit model, considering marketing and box-office information, critique, and word of mouth from other moviegoers. After validating the fitness of market share among released movies, this study conducted a set of simulation experiments considering several variables such as market size, change of weight between variables, and movie performance under competition. Propositions are derived from the simulation results is also suggested for future research.

• 디지털융복합연구
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• 제18권6호
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• pp.425-433
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• 2020

증강현실을 활용한 디지로그 북은 애플리케이션을 다운받은 후 모바일에 내장된 카메라를 Image Marker로 등록된 페이지에 비추면 증강현실이 구현되는 형태로서 콘텐츠 구현 방법에는 단편적 한계점을 나타내고 있다. 이에 본 연구에서는 증강현실 기술을 활용한 디지로그 북에 양방향 인터랙션이 가능한 팝업(Pop-up) 형태의 Multi-Tracking 방식을 제안하였다. 이를 통해 기존 책자형의 디지로그 북과 이번 연구에서 제안한 팝업(Pop-up)형태의 디지로그 북의 두 가지 프로토타입에 대한 증강현실 콘텐츠 구현에 따른 기술적 차별성에 대한 실험을 공인기관에 의뢰하여 검증하였고 시험성적서를 발급받았다. 연구에서 제안한 팝업(Pop-up)형태의 디지로그 북은 가상 이미지를 사용자의 행위(움직임)에 따른 인터랙션 콘텐츠 구현이 가능하여 책의 물리적인 변화자체가 가상콘텐츠에도 전달되는 양방향 인터랙티브 콘텐츠의 장점을 갖고 있으며, 이는 가상 이미지와 인쇄 그림책 간의 상호작용을 유도하고 학습자에게 흥미 유발 및 몰입감을 줄 수 있어 차별화된 디지로그 북의 인터랙션의 표현이 가능할 것으로 보여진다.

• 영어어문교육
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• 제6호
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• pp.1-24
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• 2000

Listening comprehension is an integrative and creative process of interaction through which listeners receive speakers' production of linguistic or non-linguistic knowledge. Compared with reading comprehension, it may arouse difficulties and thus impose more burdens on foreign learners. The Audio-Lingual Method focused primarily on speaking. Mimicry, repetition, rote memory, and transformation drills actually interfered with listening comprehension. So learners lost interest and were not highly motivated. Improving listening comprehension requires continual attentiveness and interest. Listening skill can be extended systematically only when students are frequently exposed to a wide range of listening materials with an affective, cultural, social, and psycholinguistic approach. Therefore, teachers should help students learn how to comprehend intactly the overall meaning of intended messages. The literature on teaching listening skill suggests various useful activities: TPR, dictation, role playing, singing, picture recognition, completion, prediction, seeking specific information, summarizing, labeling, humor, jokes, cartoons, media, and so on. Practical classroom teaching necessitates a systematic procedure in which students should take part in meaningful tasks/activities. In addition to this, learners must practice listening comprehension trough a self-study process.

• 대한기계학회논문집B
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• 제32권1호
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• pp.30-38
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• 2008

As a follow-up of our previous studies on flow-induced forces on two identical nearby circular cylinders immersed in the cross flow at Re=100 and flow patterns past them,$^{(1,2)}$ we present Reynolds-number effects on the forces and patterns by further computing flows with Re=40, 50, 160. We consider all possible arrangements of the two circular cylinders in terms of the distance between the two cylinders and the angle inclined with respect to the main flow direction. Collecting all the numerical results obtained, we propose contour diagrams for mean force coefficients and their rms of fluctuation as well as for flow patterns and Strouhal number for each Re. These diagrams shed light on a comprehensive picture on how the wake interaction between the two cylinders alters depending on Re.

• 교육시설
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• 제5권3호
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• pp.107-115
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• 1998

Open education is more relevant to the current educational reality which requires the liberalization, individualization and creativeness, and the effectiveness of open education will be maximized with the full utilization of instructional media. As well known, there are many different types of instructional media to promote open education such as print material, audio material, still picture, movie, computer, and multimedia. The main criteria to choose effective instructional media for open education depend upon easiness of supply and retrieval of information, and promotion of more frequent interaction among participants. In addition, utilization method, cost, curriculum contents, as well as school culture are also elements to consider in the selection of right instructional media.