• Transactions on Electrical and Electronic Materials
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• 제7권2호
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• pp.81-86
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• 2006

In this paper, the response surface modeling of the control of the pretilt angle in the nematic liquid crystal on the homogeneous polyimide surface with different surface treatment is investigated. The pretilt angle is one of the main factors to determine the alignment of the liquid crystal display. The pretilt angle is measured to analyze the variation of the characteristics on the various process conditions. The rubbing strength and the hard baking temperature are considered as input factors. After the design of experiments is performed, the process model is then explored using the response surface methodology. The analysis of variance is used to analyze the statistical significance and the effect plots are also investigated to examine the relationship between the process parameters and the response.

• 한국멀티미디어학회논문지
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• 제8권6호
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• pp.827-835
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• 2005

In this paper, self-networking and replaceable structure in vector graphics contents are presented for wireless internet service. The wireless networks over 2G or 3G are limited in the sense of the speed and the cost. Considering these characteristics of wireless network, self-networking method and replaceable structure in downloaded contents are introduced in order to save the amount of data and provide variations for contents. During the display of contents, a certain data for the contents is downloaded from the server and it is managed appropriately for the operation of the contents. The downloaded materials are reflected to the original contents using replaceable structure. Also, the downloading and modification are independent of the play. In this implementation, the data consists of control data for control and resource data for image, sound or text. Comparing to the conventional methods which download the whole data, the amount of the transmitted data is very small since only the difference is downloaded. Also, during the play of the contents, the changes are adopted immediately. The whole functions are implemented in wireless handset and the various applications are discussed.

• Physical Therapy Rehabilitation Science
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• 제3권1호
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• pp.13-19
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• 2014

Objective: The purpose of this study was to determine the effects of Augmented Reality-based Postural Control (ARPC) training on balance and gait function in patients with stroke. Design: Single-blind randomized controlled trial. Methods: Twenty participants who experienced a stroke were enrolled in the study and randomly assigned to the ARPC (n=10) or control group (n=10). Subjects in both groups received conventional physical therapy for 60 min per session, 5 days per week, for 4 weeks. In addition, subjects in the ARPC group received ARPC training for 30 min per day, 3 days per week, for 4 weeks. The participants watched established normal postural control patterns on a head-mounted display and repeated the movements in ARPC training. Outcome measurements were assessed using the Berg Balance Scale (BBS) and 10-Meter Walk Test (10MWT) before and after 4 weeks of training. Results: Of the 20 randomized participants, only 18 completed the 4-week training program. The ARPC group showed significant improvement in the BBS and 10MWT after training (p<0.05). Meanwhile, the control group did not exhibit improvement in either variable. In addition, the ARPC group showed significantly greater improvement than the control group in the 10MWT (p<0.05), whereas no significant difference was observed between the groups for the BBS. Conclusions: The results of this study confirmed the benefits of ARPC training on dynamic balance and functional gait ability. Additionally, this study may provide evidence supporting the use of an ARPC training program for improving balance and gait ability in patients after a chronic stroke.

• 한국의류산업학회지
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• 제8권1호
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• pp.34-40
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• 2006

Fascism is a term that began to be used from the late 1930s, means an idea and a system that the strong power of the state intervenes or control people's life based on the argument that the existential value of individuals is found only in the total. Fascist looks, which resulted from World War I and II, had brought a new pattern in women's fashion inspired by men's military uniforms. Thus, the purpose of this study was to identify fascist fashion trends in the first half of the twentieth century and to infer various aesthetic values of fascism expressed in fascist fashion looks. The results of this study indicated that expressions of fascism reflected the current ideology of rebellion and appealed to the original national sentiment of the masses. Fascism occurred in response to the contradiction of capitalism and its general crisis had emerged as an ideology with the highest popularity symbolizing power and government during the first half of the twentieth century. It was expressed in military looks as self-centered nationalism and yearning for minorities. Second, fascist fashion looks were not only for political and sexual temptation with the image of power but also for the display of women's status and roles through the bold expression of sexual attractiveness. Finally, fascist fashion looks expressed medieval images praising the feudal age in imagination that contained heroism and at the same time achieved integration under strict social hierarchical order.

• 한국군사과학기술학회지
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• 제24권1호
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• pp.31-40
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• 2021

The multi-channel video streaming system is an essential device for future ground combat vehicles. For the system, the application of digital interfaces is required instead of the direct analog method to support selectable multiple channels. However, due to the characteristics of the digital interfaces that require en/decoding and signal conversion, the system should support the ability to adapt to quality and delay requirements depending on how video data is utilized. To support addressed issue, this study designs and emulates the multi-channel compressed-video streaming system of ground combat vehicle's fire control system based on commercial standards. Using the system, this study analyzes the quality of video according to the rotational speed of the acquisition device and Glass-to-Glass (G2G) delay between video acquisition and display devices according to video compression rates. Through these experiments and analysis, this paper presents the design direction of the system having scalability on the latest technology while providing high-quality video data streaming flexibly.

• 조명전기설비학회논문지
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• 제17권3호
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• pp.25-31
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• 2003

본 논문에서는 레이저 디스플레이, 레이저 가공, 마킹 장비등에 사용되는 갈바노미터의 제어 시스템을 설계하였다. 갈바노미터 및 거울을 DC모터가 연결된 기본적인 2차 시스템으로 모델링하였으며, 이것의 시간 영역 분석 및 주파수 영역 분석에 기초하여 기본적인 PID제어기를 설계하였다. 기존 시스템은 폰트를 이용한 모션 발생을 위해 하나의 PC가 더 필요한데, 본 연구에서는 이 역할도 DSP가 담당하기 때문에 매우 큰 비용 절감의 효과가 있다. 갈바노미터의 정밀 위치 측정 및 구동을 위하여 16비트A/D, B/A변환기를 사용하였다. 실험 결과 제안된 제어 시스템이 실제 환경에서도 매우 잘 동작함을 확인하였다. 통신은 USB를 사용하였고, 따라서, 본 논문에서 제안된 제어 시스템은 사용자의 PC에 쉽게 연결될 수 있다는 장점도 가지고 있다.

• Architectural research
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• 제22권4호
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• pp.155-162
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• 2020

Numerous scholars have explored the modeling, control, and optimization of energy systems in buildings, offering new insights about technology and environments that can advance industry innovation. Eye trackers deliver objective eye-gaze data about visual and attentional processes. Due to its flexibility, accuracy, and efficiency in research, eye tracking has a control scheme that makes measuring rapid eye movement in three-dimensional space possible (e.g., virtual reality, augmented reality). Because eye movement is an effective modality for digital interaction with a virtual environment, tracking how users scan a visual field and fix on various digital objects can help designers optimize building environments and materials. Although several scholars have conducted Virtual Reality studies in three-dimensional space, scholars have not agreed on a consistent way to analyze eye tracking data. We conducted eye tracking experiments using objects in three-dimensional space to find an objective way to process quantitative visual data. By applying a 12 × 12 grid framework for eye tracking analysis, we investigated how people gazed at objects in a virtual space wearing a headmounted display. The findings provide an empirical base for a standardized protocol for analyzing eye tracking data in the context of virtual environments.

• 로봇학회논문지
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• 제10권3호
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• pp.171-177
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• 2015

A telerobot offers a more engaging and enjoyable interaction with people at a distance by communicating via audio, video, expressive gestures, body pose and proxemics. To provide its potential benefits at a reasonable cost, this paper presents a telepresence robot system for video communication which can deliver speaker's head motion through its display stanchion. Head gestures such as nodding and head-shaking can give crucial information during conversation. We also can assume a speaker's eye-gaze, which is known as one of the key non-verbal signals for interaction, from his/her head pose. In order to develop an efficient head tracking method, a 3D cylinder-like head model is employed and the Harris corner detector is combined with the Lucas-Kanade optical flow that is known to be suitable for extracting 3D motion information of the model. Especially, a skin color-based face detection algorithm is proposed to achieve robust performance upon variant directions while maintaining reasonable computational cost. The performance of the proposed head tracking algorithm is verified through the experiments using BU's standard data sets. A design of robot platform is also described as well as the design of supporting systems such as video transmission and robot control interfaces.

• Journal of Power Electronics
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• 제16권5호
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• pp.1821-1832
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• 2016

This study presents a strategy using the synchronized output regulation method (SOR) for controlling inverters operating in stand-alone and grid-connected modes. From the view point of networked dynamic systems, SOR involves nodes with outputs that are synchronized but also display a desirable wave shape. Under the SOR strategy, the inverter and grid are treated as two nodes that comprise a simple network. These two nodes work independently under the stand-alone mode. An intermediate mode, here is named the synchronization mode, is emphasized because the transition from the stand-alone mode to the grid-connected mode can be dealt as a standard SOR problem. In the grid-connected mode, the inverter operates in an independent way, in which the voltage reference changes for generalized synchronization where its output current satisfies the required power injection. Such a relatively independent design leads to a seamless transfer between operation modes. The closed-loop system is analyzed in the state space on the basis of the output regulation theory, which improves the robustness of the design. Simulations and experiments are performed to verify the proposed control strategy.

• 성인간호학회지
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• 제16권3호
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• pp.388-397
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• 2004

Purpose: The purpose of this study was to explore the effectiveness of informational intervention delivered by electronic patient information board in the OR waiting room for reduction of anxiety of mothers with child having operation. Method: Nonequivalent control group non-synchronized design was used in this study. The subjects was 52 mothers whose children underwent elective surgery in one Pediatric Hospital. Informational intervention in this study consisted of four critical stages. State anxiety by Spielberger, mean arterial pressure, and heart rates at preoperative and postoperative period were measured. The data were analyzed by using Chi-Square test and t-test with SPSS/PC 10.0 program. Results: 1) There was a significant difference in the state anxiety between the control and the experimental groups. 2) There was no significant difference in the mean arterial pressure between the two groups. 3) There was no significant difference in the heart rate between the two groups. Conclusion: The results of this study indicate that informational intervention delivered by electronic patient information board would be an effective intervention during the operation in reducing anxiety of mothers with child having operation.