• 한국인터넷방송통신학회논문지
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• 제22권3호
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• pp.133-138
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• 2022

디지털 방사선 검사장 치는 인간의 생명을 다루는 의료장치로 안정성과 고신뢰성이 필요하지만 이러한 시스템은 현재 최첨단 기술로 일본을 비롯한 유럽제품에 의해서 국내시장은 거의 점유된 실정이다. 따라서 상당한 부분 값비싼 수입품에 의존하고 있는 의료기기의 국산품 대체는 물론, 보다 경제적이고 조작하기 쉬운 사용자 위주의 제품을 개발, 정확한 진단을 이끄는 장치의 생산을 위한 연구와 개발이 필요하다. 특별히 디지털 X-ray 시스템 중에서 전동기 구동기술과 기계장치 개발 관련 메카트로닉스 기술은 국내에 어느 정도 성숙되어 있는 단계로 본 논문에서는 디지털 방사선 검사 장치(DR)의 전동기 서보 시스템 설계를 통하여 제어기법과 성능을 확인하고자 한다. 본 논문에서는 촬영용도에 부합하는 디지털 방사선 검사용 AC 서보전동기의 선정과 변환장치 및 제어기법을 적용하여 성능을 확인하고 문제점을 개선함에 있다.

• 디지털콘텐츠학회 논문지
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• 제18권4호
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• pp.621-629
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• 2017

인구구조의 고령화와 만성질환 환자 증가로 인한 빠른 의료비 지출 상승에 따라, 디지털 헬스케어 산업에 대한 관심도 높아지고 있다. 디지털 헬스케어는 기존 서비스의 이용자인 환자 외에 일반인까지 수요자 범위를 확장하였으며, 이에 따라 일반인의 디지털 헬스케어 이용현황 및 요구 파악에 대한 연구의 필요성이 증가하고 있다. 본 연구는 일반인 1,000명을 대상으로 인터넷 건강정보 서비스, 스마트폰 건강관리 애플리케이션, 웨어러블 디바이스, 유헬스 등 4개 부문에서 각각의 서비스 이용 경험, 이용 목적 및 보완점 등을 조사하고, 제공 받고 싶은 헬스케어 서비스 및 콘텐츠 유형, 이용 의사 등을 파악하였다. 본 연구 결과를 통하여 일반인들의 디지털 헬스에 대한 인식과 현재 서비스에 대한 만족도 및 미충족 서비스 요구를 파악함으로써 향후 디지털 헬스케어 서비스 개발에 도움이 될 수 있을 것이다.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2017년도 제55차 동계학술대회논문집 25권1호
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• pp.235-238
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• 2017

This study was to develop a portable digital radiography (PDR) system with a function measuring the X-ray source-with-detector angle (SDA) and to evaluate the imaging performance for the diagnosis of chest imaging. The SDA device consisted of an Arduino, an accelerometer and gyro sensor, and a Bluetooth module. According to different angle degrees, five anatomical landmarks on chest images were assessed using a 5-point scale. Mean signal-to-noise ratio and contrast-to-noise ratio were 182.47 and 141.43. Spatial resolution (10% MTF) and entrance surface dose were 3.17 lp/mm ($157{\mu}m$) and 0.266mGy. The angle values of SDA device were not significant difference as compared to those of the digital angle meter. In chest imaging, SNR and CNR values were not significantly different according to different angle degrees (repeated-measures ANOVA, p>0.05). The visibility scores of the border of heart, 5th rib and scapula showed significant differences according to different angles (rmANOVA, p<0.05), whereas the scores of the clavicle and 1st rib were not significant. It is noticeable that the increase in SDA degree was consistent with the increase of visibility score. Our PDR with SDA device would be useful to be applicable to clinical radiography setting according to the standard radiography guideline at various fields.

• 지식경영연구
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• 제24권1호
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• pp.51-72
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• 2023

지능정보사회에서 디지털 리터러시는 필수사항이며, 리터러시 교육이 활발히 시행되고 있다. 디지털 리터러시 수준이 올라갈수록 프라이버시 우려가 증가하는데, 이는 디지털 서비스 이용을 저해할 수 있다. 이 연구에서는 스마트기기 활용 역량과 프라이버시 우려와의 관계에서 온라인 사회참여 활동과 정보 사실성 판단 능력의 매개효과와 프라이버시 리터러시의 조절효과를 검증하였다. 스마트기기를 사용하고 온라인 활동을 하는 13세 이상의 동일 패널 7,737명의 2020년과 2021년 실시한 한국미디어패널 조사 자료를 활용하였다. 주요 변인의 비교 및 분석을 위해 SPSS(v26.0)와 PROCESS Macro(v4.1, Model 15)를 이용하였다. 2020년과 2021년의 비교에서 스마트기기 활용역량과 프라이버시 리터러시는 증가 하였지만, 프라이버시 우려와 정보 사실성 판단 능력, 온라인 사회참여 활동은 감소하였음을 보았다. 분석 대상 전체와 통제 집단에서 프라이버시 우려와 정보 사실성 판단 능력의 평균간 차이가 상대적으로 크게 감소하였으며, 통계적으로도 그 차이가 유의미하다. 연구모형 검증 결과, 스마트기기 활용역량이 프라이버시 우려에 미치는 영향은 2020년과 2021년 모두 증가하는 유의적인 효과를 확인하였으며, 온라인 사회참여 활동의 매개효과와 프라이버시 리터러시의 조절된 매개효과도 확인되었다. 정보 신뢰성 판단 능력은 2020년에 유의적이지 않지만, 2021년에는 유의한 매개효과와 조절된 매개효과도 확인되었다.

• 치과방사선
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• 제29권2호
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• pp.387-396
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• 1999

In dentistry. RadioVisioGraphy was introduced as a first electronic dental x-ray imaging modality in 1989. Thereafter. many types of direct digital radiographic system have been produced in the last decade. They are based either on charge-coupled device(CCD) or on storage phosphor technology. In addition. new types of digital radiographic system using amorphous selenium. image intensifier etc. are under development. Advantages of digital radiographic system are elimination of chemical processing, reduction in radiation dose. image processing, computer storage. electronic transfer of images and so on. Image processing includes image enhancement. image reconstruction. digital subtraction, etc. Especially digital subtraction and reconstruction can be applied in many aspects of clinical practice and research. Electronic transfer of images enables filmless dental hospital and teleradiology/teledentistry system. Since the first image management and communications system(IMACS) for dentomaxillofacial radiology was reported in 1992. IMACS in dental hospital has been increasing. Meanwhile. researches about computer-assisted diagnosis, such as structural analysis of bone trabecular patterns of mandible. feature extraction, automated identification of normal landmarks on cephalometric radiograph and automated image analysis for caries or periodontitis. have been performed actively in the last decade. Further developments in digital radiographic imaging modalities. image transmission system. imaging processing and automated analysis software will change the traditional clinical dental practice in the 21st century.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
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• pp.199-203
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• 2004

In this paper, we only describe the digital block of two-channel 18-bit analog-to-digital (A/D) converter employing sigma-delta method and xl28 decimation. The device contains two fourth comb filters with 1-bit input from sigma­delta modulator. each followed by a digital half band FIR(Finite Impulse Response) filters. The external analog sigma-delta modulators are sampled at 6.144MHz and the digital words are output at 48kHz. The fourth-order comb filter has designed 3 types of ways for optimal power consumption and signal-to-noise ratio. The following 3 digital filters are designed with 12tap, 22tap and 116tap to meet the specification. These filters eliminate images of the base band audio signal that exist at multiples of the input sample rate. We also designed these filters with 8bit and 16bit filter coefficient to analysis signal-to-noise ratio and hardware complexity. It also included digital output interface block for I2S serial data protocol, test circuit and internal input vector generator. It is fabricated with 0.35um HYNIX standard CMOS cell library with 3.3V supply voltage and the chip size is 2000um by 2000um. The function and the performance have been verified using Verilog XL logic simulator and Matlab tool.

• Journal of information and communication convergence engineering
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• 제11권3호
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• pp.185-189
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• 2013

A digital hologram generated by a computer calculation (computer-generated hologram or capture using charge-coupled device [CCD] camera) is one of the most expensive types of content, and its usage is expanding. Thus, it is highly necessary to protect the ownership of digital holograms. This paper presents an efficient visual security scheme for holographic image reconstruction with a low scrambling cost. Most recent studies on optical security concentrate their focus on security authentication using optical characteristics. However, in this paper, we propose an efficient scrambling method to protect a digital hologram. Therefore, we introduce in this paper several scrambling attempts in both the spatial domain and frequency domain on the basis of the results of analyzing the properties of the coefficients in each domain. To effectively hide the image information, 1/4, 1/256, and 1/16,384 of the original digital hologram needs to be scrambled for the spatial-domain scheme, Fresnel-domain scheme, and discrete cosine transform-domain scheme, respectively. The encryption schemes and the analyses in this paper can be expected to be useful in the research on encryption and other works on digital holograms.

• 반도체디스플레이기술학회지
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• 제20권3호
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• pp.184-188
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• 2021

In general, digital signage is a next-generation smart media that provides various information and advertisement services to many people indoors or outdoors using the Internet. Recently, digital signage is rapidly spreading in such a small indoor environment, that is, in an area closely related to daily life, for example, inside an elevator. However, in this kind of indoor environment where the stay time of persons is extremely limited, it would be not easy for them to keep advertisements in the user memory for a long time. In the digital signage display installed in an indoor environment, it is possible to think about the possibility for a function such as expanding the screen to a user's smartphone, which is now widely spread, to contain, store, and use the transmitted content. In this paper, we propose a method to extend the display of digital signage contents to personal smart phones with interaction function in such a limited environment. In order to make the system operation, the proposed system was verified by confirming the result of dual screen implementation in a smart phone through the prototype implementation of a digital signage system in an embedded Linux environment.

• 한국항해항만학회지
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• 제46권5호
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• pp.458-470
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• 2022

As the 4th industrial revolution progresses, the application of several cutting-edge technologies such as the Internet of Things, big data, and mixed reality (MR) in relation to autonomous ships is being considered in the maritime logistics field. The aim of this study was to apply the concept of a digital twin model based on Human Machine Interaction (HMI) including a digital twin model and the role of an operator to a ship. The role of the digital twin is divided into information provision, support, decision, and implementation. The role of the operator is divided into operation, decision-making, supervision, and standby. The system constituting the ship was investigated. The digital twin system that could be applied to the ship was also investigated. The cloud-based digital twin system architecture that could apply investigated applications was divided into ship data collection (part 1), cloud system (part 2), analysis system/ application (part 3), and MR/mobile system (part 4). A Mixed Reality device HoloLens was used as an HMI equipment to perform a simulation test of a digital twin system of an 8 m battery-based electric propulsion ship.

• 가정과삶의질연구
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• 제29권4호
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• pp.61-74
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• 2011

The purpose of this study was to target digital generation consumers and determine potential effects of their demographic characteristics and variables concerning digital consumer information upon their characteristics in purchasing clothing. This study has its implications in the sense that it determines digital generation's awareness and reception of digital consumer information and their utilization of digital consumer information source, so that it can help understand digital generation consumers' behaviors of information search and the phenomena of digital market in this age of knowledge and information, and can ultimately provide reference data useful for guidance in favorable consumer life as well as consumer education based on digital devices. The results of this study can be summed up as follows: It is found that digital generation consumers reached higher level in the awareness of digital consumer information. The reception of digital consumer information and the utilization of digital consumer information source are found as middle level. Based on these results, this study can give the following suggestions for consumer education: Lately, digital devices have been widely popularized into larger number of users, so that we have more chances to buy desired products on the web or mobile device. In particular, the rate of clothing purchase on the web tends to increase year by year. However, our digital consumers still lack in their ability to utilize digital consumer information in terms of quantitatively increasing purchase of products on the basis of digital consumer information. Thus, it is necessary to provide consumers with a formulated education in their information search and shopping using digital devices, so that they will have better ability to use digital consumer information in the future.