• Journal of the Korean Society for Precision Engineering
• /
• v.16 no.7
• /
• pp.15-23
• /
• 1999

With a remarkable expansion of communication industry, a pager or a cellular phone becomes a necessary communication device in modern society. However, a paging signal by a buzzer is often acted as an unpleasant noise in some places, thus necessitating a paging signal by a vibration motor. In this paper, a simpler type of a vibration motor, a coreless permanent magnet(PM) DC motor, is considered to substitute for the conventional vibration motors. Using an analytical method, electromagnetic field and operating torque were calculated for the given inner and outer PM type motors, and the results were confirmed by FEM analysis. As design parameters, number of PM poles, PM radial thickness, coil arc angle and number of winding stacks were chosen for sensitivity analysis. It shows that coil arc angle is the most important design parameter to increase the motor performance, without giving an adverse effect on motor weight, size and manufacturing cost. Based on the analysis of the outer PM type motor, an outer square PM type motor is proposed as the final design. Compared to the outer PM type, outer square type provides more flexibility to attach to the small size cellular phones. With the optimum design of square outer PM DC motor, it can successfully substitute the conventional types with less expensive manufacturing cost. better performance and smaller necessary space.

• 한국HCI학회:학술대회논문집
• /
• 2006.02a
• /
• pp.1207-1213
• /
• 2006

오늘날 모바일 기기가 갖는 역할이 다양해짐과 동시에 모바일 플랫폼에서의 사용자 인터페이스(User Interface, UI)에 대한 연구 또한 활발히 이루어지고 있다. 이는 전통적인 데스크탑 플랫폼에서의 정보에 대한 일반적인 접근 방법이 모바일 기기에 적용하기에는 적절하지 않기 때문이며, 이는 모바일 기기의 제한된 스크린 크기, 부자연스러운 상호작용 방식, 그리고 기기와 관련된 기술적인 다른 요인들과 관련된다고 할 수 있다. 본 연구에서는 휴대폰, PDA, 스마트폰과 같이 작은 화면을 가진 모바일 기기에서 제시되는 메뉴를 탐색할 때 효과적인 메뉴 형식과 페이징 형식이 무엇인지 알아보고자 하였다. 메뉴 형식은 모바일 기기에서 일반적으로 많이 사용되는 열거형(list) 메뉴와 격자형(grid) 메뉴의 두 가지로 제시하였고, 페이징 형식은 한 번에 한 줄씩 화면 하단에서 위로 이동하는 스크롤(scrolling) 방식과 한 번에 한 화면 전체가 위로 이동하는 페이지 간(page-to-page) 이동 방식의 두 가지로 제시하였다. 실험 1 에서는 한 수준의 깊이를 가진 메뉴에서 메뉴 형식과 페이징 형식에 따른 탐색 과제 수행을 측정한 결과, 열거형 메뉴보다 격자형 메뉴에서 사용자들의 메뉴 탐색 수행이 유의미하게 빠르며, 사용자의 만족도 또한 높은 것으로 나타났다. 그러나 페이징 형식에 따른 메뉴 탐색 수행 시간과 선호도에는 유의미한 차이점이 없었고, 메뉴 형식과 페이징 형식간의 상호작용 또한 나타나지 않았다. 실험 2 의 결과, 두 수준의 깊이를 가진 메뉴에서는 페이징 방식이 메뉴 탐색 정확도에 미치는 유의미한 주효과가 있었다. 메뉴 탐색 수행 시간과 주관적 만족도는 실험 1 과 같게 나타났다. 이는 메뉴 형식과 페이징 방법에 따라 사용자의 수행과 선호도가 차이가 있음을 시사한다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2008.04a
• /
• pp.218-223
• /
• 2008

Cell-phone becomes a necessary communication device in modern society. However, a paging signal by a sound transducer often acts as an unpleasant noise, thus necessitating a paging signal by a vibration motor. The conventional flat type vibration motor uses three-phase windings with three phase coils. In this article, a new design of a vibration motor using a V connection with two phase coils is presented, increasing mass productivity. For electromagnetic field analysis, due to the motor symmetry, two-dimensional modeling can be implemented for fast computation, and performance is predicted by the finite element method. The winding distribution angle turns out to be the most important design parameter for the elimination of dead points, and a new coil configuration is suggested which has no adverse effect on motor size and weight. Experimental tests of vibration confirm the validity of the proposed design.

• Journal of the Ergonomics Society of Korea
• /
• v.32 no.2
• /
• pp.189-198
• /
• 2013

Objective: This research was carried out to study the menu type design of instrument cluster IVIS(In Vehicle Information System) for efficient navigation under deconcentrated situations. Background: A driver controls the IVIS menu using the rest of cognitive resources while driving a car. Although a driver controls the IVIS using extra cognition resources, his or her distraction can still cause some safety problems while driving. Menu type design of instrument cluster is absolutely important for safe and efficient navigation. Method: Four menu types including paging, flow, icon, and list type were identified through reviewing the existing IVIS of vehicle and the menu structure of cellular phone. Four menu types were evaluated through experiment. The experiment consisted of primary and secondary task, which the primary task was to simulate a driving and the secondary task was to control an IVIS menu prototype. Task performances, menu type preferences, and eye-movement patterns were measured in this experiment. Results: The result shows that icon type was the best design in aspect of task performance and preference. A clue for next menu item provided a positive effect for efficient menu navigation. It was identified that most of subjects gazed the middle-top area of IVIS screen from eye-movement pattern. Conclusion: A basic design of Instrument Cluster IVIS was proposed considering the result of this study in the final. Application: The results of this study can be effectively used in the design of Instrument Cluster IVIS.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.29 no.12B
• /
• pp.1063-1069
• /
• 2004

There are some problems with the methods of paging and routing cache(PRC) and quasi soft handoff that are proposed to improve the performance for the transmission of real time data. This paper proposed a reasonable solution of these problems by proposing a new method using a combined cache(CC) and applying a different handoff procedure according to each type of data. The combined cache dose not maintain the handoff state but the idlle/active state. The simulation results in a better performance than the above methods in terms of the control packet traffic load, initial recevied data packet traffic load and arrival tune of real time packet at the epoch of handoff.

• The Journal of the Korea Contents Association
• /
• v.3 no.2
• /
• pp.65-72
• /
• 2003

In this paper, the new scheme using a Combined Cache(CC) that combing the Paging and Routing Cache(PRC) and an alternative handoff method according to the type of data transmission for achieving the efficient realtime communication. The PRC and quasi-soft handoff method reduce the path duplication. But they increase the network traffic load because of the handoff state packet of Mobile Host(MH). Moreover the use the same handoff method without differentiating the type of transmission data. Those problems are solved by operating U with a semi-soft handoff method for realtime data transmission and with a hard handoff method for non-realtime data transmission. As a result or simulation a better performance is obtained because of the reduction of the number of control packet in case that the number of cells are below 20. And the packet arrival time and loss of packet decreased significantly for realtime data transmission.

• Journal of Digital Contents Society
• /
• v.13 no.1
• /
• pp.119-127
• /
• 2012

In this study, it was witnessed that a variety of tests are implemented in a type of convergence of multimedia such as photos, sounds, and videos as well as letters and drawings, components of existing traditional comics as comics are digitalized and are converted to various devices. Therefore, we studied the concept of multimedia comics as a basis of this study by judging that new barometer to comics lies in convergence with such multimedia. After recognizing components of multimedia comics which are currently emerging, we categorized them into three types depending on how to use these elements. First, convergence type webtoon has a very similar format with existing vertical scrolling webtoon and has characteristics that background & effects sounds are added to emphasize the features of webtoon, or photos or videos are inserted in part, and there is no function to control these elements; Second, motion comic, a medium format between comic and animation has a characteristic that sound, video, paging are auto-played like watching animation but it keeps the format of comics within one frame; Third, interactive comic has a characteristic that effects sound, motion, and story are made by active participation of viewers. As a result of analyzing comics which having above multimedia characteristics, its implications are as followings: First, multimedia elements should be used depending on genre, age, and media; Second, high level of control technology considering the features of comic-viewers is needed. In other words, in continuously evolving media environments, comic contents being proper to targets and use purposes of viewers should be developed. For this, multimedia elements of comics should be used in order that comic-viewers can have active & interactive communication with contents.