• Journal of information and communication convergence engineering
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• 제17권4호
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• pp.274-278
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• 2019

It is important that students are provided opportunities to practice their skills in acquiring radiographic images. However, these opportunities are currently limited because of the risk of radiation exposure. To overcome this limitation, a new augmented reality-based radiography simulator was developed that enables students to practice radiographic techniques as part of self-directed learning without time and space constraints. Subsequently, cross-sectional images of a manikin phantom head obtained via computed tomography were reconstructed into a three-dimensional object. An image marker that could be recognized by a mobile device and could allow users to practice dental radiography techniques was devised. The three-dimensional object was augmented to the mobile device; consequently, among 106 stored dental radiographs on the device, a radiograph corresponding to specific imaging conditions was opened when users performed radiographic procedures. This technology could improve dental students' understanding of dental anatomy and contribute to improving their competency in acquiring dental radiographs.

• 센서학회지
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• 제31권5호
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• pp.286-292
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• 2022

As mobile electronics become smarter, higher-level security systems are necessary to protect private information and property from hackers. For this, biometric authentication systems have been widely studied, where the recognition of unique biological traits of an individual, such as the face, iris, fingerprint, and voice, is required to operate the device. Among them, ultrasound fingerprint imaging technology using piezoelectric materials is one of the most promising approaches adopted by Samsung Galaxy smartphones. In this review, we summarize the recent progress on piezoelectric ultrasound micro-electro-mechanical systems (MEMS) transducers with various piezoelectric materials and provide insights to achieve the highest-level biometric authentication system for mobile electronics.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
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• pp.1807-1810
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• 2007

The evolution of a multi viewer autostereoscopic display is described. Development of the display was originally a part of the EC funded 'ATTEST' project and continues as another EC project 'MUTED'. The design of the original display is presented and the limitations of the prototype are described. The current iteration of the design is presented.

• Applied Science and Convergence Technology
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• 제26권6호
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• pp.195-200
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• 2017

A mobile lab kart for plasma training is developed with a high vacuum pumping system, vacuum gauges and a glass discharge tube powered by a high voltage transformer connected to a household 60 Hz line. A numerical model is developed by using a commercial multiphysics software package, CFD-ACE+ to analyze the experimental data. Simulations for argon and nitrogen were carried out to provide fundamental discharge characteristics. Variations of the kart configuration were demonstrated: a glass tube with three electric probes, optical emission spectrometer attachment and infra red thermal imaging system to give more detailed analysis of the discharge characteristics.

• Imaging Science in Dentistry
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• 제42권2호
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• pp.71-75
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• 2012

Purpose : Dental trauma is frequently unpredictable. The initial assessment and urgent treatment are essential for dentists to save the patient's teeth. Mobile-phone-assisted teleconsultation and telediagnosis for dental trauma could be an aid when a dentist is not available. In the present in-vitro study, we evaluated the success rate and time to transfer images under various conditions. Materials and Methods : We analyzed the image quality of cameras built into mobile phones based on their resolution, autofocus, white-balance, and anti-movement functions. Results : The image quality of most built-in cameras was acceptable to perform the initial assessment, with the autofocus function being essential to obtain high-quality images. The transmission failure rate increased markedly when the image size exceeded 500 kB and the additional text messaging did not improve the success rate or the transmission time. Conclusion : Our optimal protocol could be useful for emergency programs running on the mobile phones.

• 디지털융복합연구
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• 제18권3호
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• pp.311-316
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• 2020

은 2016년 중국에서 서비스를 시작한 모바일 앱 기반의 SNS 동영상 플랫폼이다. 서비스가 시작된 처음에는 뮤직 비디오 콘텐츠가 주를 이루웠고, 이후 다양한 콘텐츠를 제공하는 소셜 플랫폼으로 발전하였으며 영상의 창작, 제작, 편집 등의 제작과정이 간편하게 제공되었다. 모바일에서 이 서비스를 시작한 후 젊은층을 중심으로 나타나고 있는 여러 가지의 사회 현상과 본 앱에서 인기 있는 영상콘텐츠의 유형과 특징을 분석하였다. 세로형 Short Clip 형태의 영상콘텐츠의 수요는 급격히 증가 추세이며, 이는 모바일 기반 영상 제작기술의 발전에 따라 영상콘텐츠의 질적 향상을 기대할 수 있다. 본 연구를 통해 모바일을 기반으로 하는 창작 동영상 제작자들에게 유용한 자료로 활용되길 기대한다.

• 한국전자통신학회논문지
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• 제18권2호
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• pp.305-312
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• 2023

다양한 교육 분야에 기억법을 도입함에 있어서 모바일 환경에서 동작하는 프로그램은 접근성을 높이고 교육의 효과를 높이는 목적으로 활용할 수 있다. 의미가 부여된 단어를 기억하는 것은 연도와 같은 숫자 정보를 기억하는 일에 비하면 훨씬 쉽다. 교육적 효과를 높이고자 하는 입장에서 어플리케이션의 도움을 받아 보완되어야 할 부분이라 생각되는 부분은 수치 정보라 할 수 있다. 기존의 수치 기억법과 연관된 대부분의 연구는 숫자를 이미지화해 기억에 도움을 주는 형태에 초점이 맞춰져 있다. 모바일 환경에서 기억법 기반 메타레코드 알고리즘 논문에서는 이전 연구에서 개발한 어플리케이션은 입력한 수치 정보에 대해 사용자가 실수할 수 있는 부분을 발견하고 단순 수정하는 방법에 그쳐 이를 보완하고자 한다. 본 연구에서는 개인화된 로그 정보를 기반으로 메타데이터를 구성하여 실수를 수정함으로써 기억률을 높이고자 한다. 이를 위해 모바일 환경에 적합한 어플리케이션을 개발하고 메타레코드 데이터의 구조를 제안하고 메타레코드 적용 알고리즘을 구현하고 평가한다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.1485-1490
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• 2004

Recently, we have remarkable developments in intelligent robot systems. The remarkable features of intelligent robot are that it can track user, does face recognition and vital for many surveillance based systems. Advantage of face recognition when compared with other biometrics recognition is that coerciveness and contact that usually exist when we acquire characteristics do not exist in face recognition. However, the accuracy of face recognition is lower than other biometric recognition due to decrease in dimension from of image acquisition step and various changes associated with face pose and background. Factors that deteriorate performance of face recognition are many such as distance from camera to face, lighting change, pose change, and change of facial expression. In this paper, we implement a new 3D active camera system to prevent various pose variation that influence face recognition performance and propose face recognition algorithm for intelligent surveillance system and mobile robot system.

• Asian Pacific Journal of Cancer Prevention
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• 제15권3호
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• pp.1327-1331
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• 2014

Background: Electrical impedance tomography (EIT) is a new non-invasive, mobile screening method which does not use ionizing radiation to the human breast; allows conducting quantitative assessment of the images besides the visual interpretation. The aim of this study was to correlate the quantitative assessment and visual interpretation of breast electrical impedance tomographs and associated factors. Materials and Methods: One hundred and fifty mammography patients above 40 years and undergoing EIT were chosen using convenient sampling. Visual interpretation of the images was carried out by a radiologist with minimum of three years experience using the breast imaging - electrical impedance (BI-EIM) classification for detection of abnormalities. A set of thirty blinded EIT images were reinterpreted to determine the intra-rater reliability using kappa. Quantitative assessment was by comparison of the breast average electric conductivity with the norm and correlations with visual interpretation of the images were determined using Chi-square. One-way ANOVA was used to compare the mean electrical conductivity between groups and t-test was used for comparisons with pre-existing Caucasians statistics. Independent t-tests were applied to compare the mean electrical conductivity of women with factors like exogenous hormone use and family history of breast cancer. Results: The mean electrical conductivity of Malaysian women was significantly lower than that of Caucasians (p<0.05). Quantitative assessment of electrical impedance tomography was significantly related with visual interpretation of images of the breast (p<0.05). Conclusions: Quantitative assessment of electrical impedance tomography images was significantly related with visual interpretation.

• 전자공학회논문지
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• 제50권7호
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• pp.167-174
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• 2013

스마트폰이 폭넓게 보급되면서 시각장애인을 위한 스마트폰 어플리케이션이 다양하게 개발되고 있으며, 이와 함께 시각장애인이 모바일 단말을 이용한 사진 촬영의 필요성도 증가하고 있다. 시각장애인들은 자신의 기록을 남기거나 타인과 교류를 하기 위해 사진을 촬영하며, 실제 취득 과정에서는 촉각과 청각에 의존하거나 타인의 도움이 요구된다. 본 논문에서는 시각장애인이 사용하는 모바일 카메라의 입력 영상을 대상으로 사전에 등록된 인물을 인식하고 눈깜빡임이나 블러 등의 유무 등을 검사한다. 또한 시각장애인이 스스로 사진촬영이 가능하도록 가이드 정보 등을 음성으로 안내하는 새로운 시스템이 제안된다.