• Journal of the Optical Society of Korea
• /
• 제17권6호
• /
• pp.513-517
• /
• 2013

Recently, maskless lithography (ML) systems have become popular in digital manufacturing technologies. To achieve high-throughput manufacturing processes, digital micromirror devices (DMD) in ML systems must be driven to their operational limits, often in harsh conditions. We propose an instrument and algorithm to detect DMD malfunctions to ensure perfect mask image transfer to the photoresist in ML systems. DMD malfunctions are caused by either bad DMD pixels or data transfer errors. We detect bad DMD pixels with $20{\times}20$ pixel by white and black image tests. To analyze data transfer errors at high frame rates, we monitor changes in the frame rate of a target DMD pixel driven by the input data with a set frame rate of up to 28000 frames per second (fps). For our data transfer error detection method, we verified that there are no data transfer errors in the test by confirming the agreement between the input frame rate and the output frame rate within the measurement accuracy of 1 fps.

• 대한전기학회논문지:시스템및제어부문D
• /
• 제53권11호
• /
• pp.768-775
• /
• 2004

The SSA technique in the digital circuit test is required to be repeated the input pattern stream to n bits output nodes n times in case of using a multiplexor. Because the method adopting a parallel/serial bit convertor to remove this inefficiency has disadvantage of requiring the test time n times for a pattern, the test strategy is required, which can enhance the test productivity by reducing the test time based on simplified fault detection mechanism. Accordingly, this paper proposes a test strategy which enhances the test productivity and efficiency by appling PAS (Parallel Signature Analysis) technique to those after analyzing the structure and characteristics of the digital devices including TTL and CMOS family ICs as well as ROM and RAM. The PSA technique identifies the faults by comparing the reminder from good device with reminder from the tested device. At this time, the reminder is obtained by enforcing the data stream obtained from output pins of the tested device on the LFSR(Linear Feedback Shift Resister) representing the characteristic equation. Also, the method to obtain the optimal signature analyzer is explained by furnishing the short bit input streams to the long bit input streams to the LFSR having 8, 12, 16, 20bit input/output pins and by analyzing the occurring probability of error which is impossible to detect. Finally, the effectiveness of the proposed test strategy is verified by simulating the stuck at 1 errors or stuck at 0 errors for several devices on typical 8051 digital board.

• Biomedical Engineering Letters
• /
• 제8권4호
• /
• pp.399-404
• /
• 2018

The purpose of this study was to evaluate the accuracy of a mobile wireless digital automatic blood pressure monitor for clinical use and mobile health (mHealth). In this study, a manual sphygmomanometer and a digital blood pressure monitor were tested in 100 participants in a repetitive and sequential manner to measure blood pressure. The guidelines for measurement used the Korea Food & Drug Administration protocol, which reflects international standards, such as the American National Standard Institution/Association for the Advancement of Medical Instrumentation SP 10: 1992 and the British Hypertension Society protocol. Measurements were generally consistent across observers according to the measured mean ${\pm}SD$, which ranged in $0.1{\pm}2.6mmHg$ for systolic blood pressure (SBP) and $0.5{\pm}2.2mmHg$ for diastolic blood pressure (DBP). For the device and the observer, the difference in average blood pressure (mean${\pm}$SD) was $2.3{\pm}4.7mmHg$ for SBP and $2.0{\pm}4.2mmHg$ for DBP. The SBP and DBP measured in this study showed accurate measurements that satisfied all criteria, including an average difference that did not exceed 5 mmHg and a standard deviation that did not exceed 8 mmHg. The mobile wireless digital blood pressure monitor has the potential for clinical use and managing one's own health.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2005년도 추계종합학술대회
• /
• pp.411-414
• /
• 2005

The most recent trend on digital hearing aid is to increase the ratio of signal to noise by directivity or to develop noise reduction algorithm inside DSP IC chip. This paper designed, fabricated and tested a digital hearing aid directivity testing device in which a micro-mouse-like the stepping motor with a speaker rotates around an examinant. Both ears of the examinant were fixed with ITE hearing aids in order to response to receiving sound. The diameter of the directivity testing device was 2 [m] and the micro-mouse was precisely controlled by PICBASIC micro processor.

• 한국HCI학회:학술대회논문집
• /
• 한국HCI학회 2006년도 학술대회 2부
• /
• pp.571-576
• /
• 2006

본 연구는 플렉서블 디스플레이의 제품 적용 시 다루어져야 할 인터페이스 디자인 관점에서의 접근으로서의 목적을 가진다. 유연성을 중심으로 플렉서블 디스플레이의 기술과 서비스를 살펴보고, 인간과 도구의 인터랙션 관점에서 플렉서블 디스플레이의 구부림 조작의 가능성을 살펴본다. 또한 이러한 조작 방식의 사례 연구로서, 휴대형 멀티미디어 기기에서의 디스플레이의 구부림을 이용한 조작 방식의 적용 시 사용자는 어떠한 경험지식을 활용하여 조작하는가를 실험을 통해 알아본다. 실험의 결과로부터 물리적 조작과 화면정보구조에 대한 개념을 정리하고 그에 따른 플렉서블 디스플레이의 구부림 조작을 활용한 인터페이스 사례를 제안한다.

• 한국정보시스템학회지:정보시스템연구
• /
• 제23권4호
• /
• pp.169-196
• /
• 2014

This study investigates how information and communication technology (ICT) can damage intellectual property rights (IPR) in the movie industry. Utilizing a survey questionnaire to gather information about the extensive use of ICT devices, including tablet PCs and smartphones, we demonstrate how digital piracy behavior is associated with various socio-demographic characteristics. Econometrically, since a large number of people do not engage in piracy activities, we adopt a zero-inflated negative binomial model. We find that people with tablet PCs are more likely to engage in the piracy of movies from peer-to-peer (P2P) sites. In particular, when we categorize ICT devices based on whether they are portable and allow downloads, we find that people with devices equipped with both functions are most likely to engage in movie piracy.

• 디지털산업정보학회논문지
• /
• 제16권1호
• /
• pp.33-39
• /
• 2020

A smart grid is a next-generation power grid that can improve energy efficiency by applying information and communication technology to the general power grid. The smart grid makes it possible to exchange information about electricity production and consumption between electricity providers and consumers in real-time. Advanced metering infrastructure (AMI) is the core technology of the smart grid. The AMI provides two-way communication by installing a modem in an existing digital meter and typically include smart meters, data collection units, and meter data management systems. Because the AMI requires data collection units to control multiple smart meters, it is essential to ensure network availability under heavy network loads. If the load on the work done by the data collection unit is high, it is necessary to allocation new data collection units to ensure availability and improve energy efficiency. In this paper, we discuss the allocation scheme of data collection units for the energy efficiency of the AMI.

• Journal of the Optical Society of Korea
• /
• 제16권4호
• /
• pp.365-371
• /
• 2012

A three-dimensional integral-floating display with 360 degree horizontal viewing angle is proposed. A lens array integrates two-dimensional elemental images projected by a digital micro-mirror device, reconstructing three-dimensional images. The three-dimensional images are then relayed to a mirror via double floating lenses. The mirror rotates in synchronization with the digital micro-mirror device to direct the relayed three-dimensional images to corresponding horizontal directions. By combining integral imaging and the rotating mirror scheme, the proposed method displays full-parallax three-dimensional images with 360 degree horizontal viewing angle.

• International journal of advanced smart convergence
• /
• 제8권3호
• /
• pp.87-94
• /
• 2019

IoT-based services are being released in accordance with the aging population and the demand for well-being pursuit needs. In addition to medical device companies, companies with ideas ranging from global ICT companies to startup companies are accelerating their market entry. The areas where these services are most commonly applied are health/medical, life/safety, city/energy, automotive and transportation. Furthermore, by expanding IoT technology convergence into the area of life care services, it contributes greatly to the development of service models in the public sector. It also provides an important opportunity for IoT-related companies to open up new markets. By addressing the problems of life care services that are still insufficient. We are providing opportunities to pursue the common interests of both users and workers and improve the quality of life. In order to establish IoT-based digital life care services, it is necessary to develop convergence technologies using cloud computing systems, big data analytics, medical information, and smart healthcare infrastructure.

• 정보교육학회논문지
• /
• 제19권3호
• /
• pp.287-298
• /
• 2015

정보통신기술의 발달과 함께 학교 현장에서는 새로운 교육 패러다임을 현실화시킬 교재로서 디지털교과서를 주목하고 있다. 본 연구는 초등학생들의 디지털교과서 만족도에 영향을 미치는 요인을 가정, 교사, 학교 요인으로 선정하여 만족도 차이를 분석하고, 이들 요인이 디지털교과서에 미치는 영향 정도를 분석하기 위한 목적으로 진행되었다. 충남 지역 초등학생과 학부모 각각 201명을 대상으로 설문을 실시하고, 결과를 분석하였다. 분석 결과, 첫째, 가정 내 인터넷 이용환경, 디바이스 보유 환경, 학습 및 정보수집 용도 인터넷 활용 유무 및 활용 시간, 교사 사용 디바이스 종류, 디지털교과서 수업 시수 및 시간 비율 등의 요인에 대해 디지털교과서 만족도는 통계적으로 유의한 차이를 나타냈다. 둘째, 각 변인들의 영향력을 분석한 결과, 가정 요인의 디지털교과서에 대한 학부모의 인식이 디지털교과서 관련 만족도에 가장 많은 영향을 미치고 있었다. 본 연구는 디지털교과서 사용을 위해 어떤 노력이 필요한 지에 대한 시사점을 제공했다는 데 의의가 있다.