• 한국멀티미디어학회논문지
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• 제22권5호
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• pp.613-625
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• 2019

The rise of the Internet of Things (IoT) devices have greatly influenced many industries and one of them is healthcare where wearable devices started to track all your daily activities for better health monitoring accuracy and even down to tracking daily food intake in some cases. With the amounts of data that are being tracked and shared between from these devices, questions were raised on how to uphold user's data privacy when data is shared between these IoT devices and third party. With the blockchain platforms started to mature since its inception, the technology can be implemented according to a variety of use case scenarios. In this paper, we present a system architecture based on the healthcare system and IoT network by leveraging on multiple blockchain networks as the medium in between that should enable users to have direct authority on data accessibility of their shared data. We provide proof of concept implementation and highlight the results from our testing to show how the efficiency and scalability of the healthcare system improved without having a significant impact on the performance of the Electronic Medical Record (EMR) that mostly affected by the previous solution since these solutions directly connected to a public blockchain network and which resulted in significant delays and high cost of operation when a large amount of data or complicated functions are involved.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 추계학술대회
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• pp.854-856
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• 2014

일인 다기기 시대에 맞추어 스마트 기기로 다양한 가전제품과 전자기기를 스마트 디바이스를 이용하여 제어 가능하게 출시하고 있다. 또한, 청소로봇과 냉장고, 에어컨, TV 등의 제품 수가 빠르게 증가하고 있으며 이러한 기기들을 이용하여 DLNA(Digital Living Network Alliance) 시스템을 구축하고 있다. 그리고 국내외에서 IoT(Internet Of Things)나 Alljoyn 같은 기술들을 개발 및 제공하고 있다. 하지만 현재 사용하고 있는 가전제품이나 전자기기들은 운영체제가 설치되어있는 제품보다 설치되어있지 않은 제품이 많다. 또한, 스마트 가전제품을 사용하지 않는 사용자는 스마트 가전제품 보다는 기존의 전자제품을 구입하는 경우가 더 많이 발생한다. 본 논문에서는 모바일 기기를 사용하여 사용자가 원하는 데이터를 수치화하고 아두이노 보드에 전송하여 운영체제가 없는 기존의 가전제품도 스마트 기기와 같은 제어를 할 수 있도록 하는 시스템을 제안하고 구현한다.

• 정보보호학회논문지
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• 제20권3호
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• pp.93-104
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• 2010

모바일 기기의 보편화와 다양한 종류의 모바일 기기들의 등장에 따라 각종 모바일 서비스들이 제공되고 있다. 이런 모바일 서비스가 늘어나면서 문자메시지, 사진 및 동영상, 주소록, 이메일, 공인인증서 및 기타 각종 개인 정보 등과 같이 단말기에 저장되는 사용자의 정보 또한 다양해지게 되었다. 모바일 기기는 분실 및 도난이 용이하기 때문에 이런 개인정보를 보호하는 사용자 인증이 매우 중요하나, 현재 보편적으로 사용되는 개인식별번호 입력 방법 또는 패스워드 입력 방법은 엿보기 공격(Shoulder Surfing Attack: SSA)에 안전하지 않기 때문에 공격자는 쉽게 사용자의 정보를 얻을 수 있다. 기존에 SSA를 막기 위한 방법들이 제안되어 왔으나 사용 편의성이 떨어지고 모바일 환경에서 사용하기 힘들다. 이에 본 논문에서는 모바일 환경에서 SSA에 안전하면서도 사용자 편의성이 뛰어난 새로운 패스워드 입력 방법을 제안한다. 또한 기존 방법들과의 비교 및 사용자 실험을 통하여 다양한 공격에 대한 안전성 및 사용편의성을 보인다.

• 한국정보시스템학회지:정보시스템연구
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• 제32권4호
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• pp.211-227
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• 2023

Purpose In the contemporary landscape, marked by the enduring impact of COVID-19 and the recent disruptions stemming from the conflict in Ukraine, the purpose of this study is to navigate the era characterized by pervasive risk and uncertainty. Specifically, the study aims to dissect the impact of the COVID-19 outbreak on digital transformation, exploring the factors influencing this process and considering the multifaceted dynamics at play. The focus extends to the post-COVID-19 landscape, scrutinizing the implications and meanings of digital transformation both before and after the pandemic. Additionally, the study delves into future digital trends, with particular attention to climate and environmental issues, emphasizing corporate responsibilities in averting crises similar to COVID-19. The overarching goal is to provide a holistic perspective, shedding light on both positive and negative facets of digital transformation, and advocating for regulatory enhancements and legal frameworks conducive to a balanced and resilient digital future. Design/methodology/approach This study employs a comprehensive approach to analyze the impact of the COVID-19 outbreak on digital transformation. It considers various facets, such as smart devices reshaping daily routines, transformative changes in corporate ecosystems, and the adaptation of government institutions to the digital era within the broader context of the Fourth Industrial Revolution. The analysis extends to the post-COVID-19 landscape, examining the implications and meanings of digital transformation. Future digital trends, especially those related to climate and environmental issues, are prognosticated. The methodology involves a proactive exploration of challenges associated with digital transformation, aiming to advocate for regulatory enhancements and legal frameworks that contribute to a balanced and resilient digital future. Findings The findings of this study reveal that the digital economy has gained momentum, accelerated by the proliferation of non-face-to-face industries in response to social distancing imperatives during the COVID-19 pandemic. Digital transformation, both preceding and succeeding the onset of the pandemic, has precipitated noteworthy shifts in various aspects of daily life. However, challenges persist, and the study highlights factors that either bolster or hinder the transformative process. In the post-COVID-19 era, corporate responsibilities in averting crises, particularly those resembling the pandemic, take center stage. The study emphasizes the need for a holistic perspective, acknowledging both positive and negative facets of digital transformation. Additionally, it calls for proactive measures, including regulatory enhancements and legal frameworks, to ensure a balanced and resilient digital future.

• 한국정밀공학회지
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• 제31권11호
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• pp.981-986
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• 2014

Printed electronics devices are made of several sets of printed patterns. The quality or printability of the printed patterns determines the electrical performance of such devices. Moreover, control of the printability determines the reliability of such devices. Despite its importance, few studies have been reported for the measurement of the printed patterns to evaluate their printability. In this study, a measurement method is proposed for printed patterns, including the definition of the properties to be measured, and the related software is described. The proposed method measures the width, pinholes, and edge waviness and evaluates the printability of the patterns quantitatively. The proposed measurement method could be an efficient tool to evaluate and enhance the printability of printed patterns in printed electronics.

• 제어로봇시스템학회논문지
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• 제7권10호
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• pp.837-842
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• 2001

In this paper, we design and implement the DC characteristic measurement system for semiconductor devices. The proposed system is composed of 4 SMU(Source and Measure Unit) channels. Various efforts in hardware and software have been made to reduce the measurement errors. Internal and external sources of errors in measurement system especially in pA range measurement have been identified and removed. Also, various digital signal processing techniques are developed. Calibration is executed under the control of microprocessor periodically. Experimental results show that the implemented system can measure the DC characteristic of semiconductor devices with less than 0.2% error in various voltage and current source/measurement range.

• Journal of Information Processing Systems
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• 제12권2호
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• pp.263-274
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• 2016

The exceptional development of electronic device technology, the miniaturization of mobile devices, and the development of telecommunication technology has made it possible to monitor human biometric data anywhere and anytime by using different types of wearable or embedded sensors. In daily life, mobile devices can collect wireless body area network (WBAN) data, and the co-collected location data is also important for disease analysis. In order to efficiently analyze WBAN data, including location information and support medical analysis services, we propose a geohash-based spatial index method for a location-aware WBAN data monitoring system on the NoSQL database system, which uses an R-tree-based global tree to organize the real-time location data of a patient and a B-tree-based local tree to manage historical data. This type of spatial index method is a support cloud-based location-aware WBAN data monitoring system. In order to evaluate the proposed method, we built a system that can support a JavaScript Object Notation (JSON) and Binary JSON (BSON) document data on mobile gateway devices. The proposed spatial index method can efficiently process location-based queries for medical signal monitoring. In order to evaluate our index method, we simulated a small system on MongoDB with our proposed index method, which is a document-based NoSQL database system, and evaluated its performance.

• 전기학회논문지
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• 제56권9호
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• pp.1680-1687
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• 2007

A hospital room has multiple patient monitoring devices at the bedside to monitor his or her status. However, vital sign monitors, ventilator and other bedside devices are made by a variety of different manufacturers and often cannot easily interface to the hospital information system. Medical environments incorporate complex and integrated data networks to transfer vast amounts of patient information, such as images, waveforms, and other forms of digital data. Hence, to assure interoperability of images, waveforms and patient data, Health Level Seven (HL7) was developed as an international standard to facilitate the communicating and storing of medical data. In this study, we developed middleware capable of receiving data from mCare 300 vital signs monitoring devices and converting the data to HL7 data format. The HL 7 middleware streamline clinical workflow and support patients. Therefore, clinical expertise are empowered to respond to dynamic healthcare situation as soon as they emerged, and consequently quality of care while helping to reduce the length of a patient's stay in a hospital.

• 대한두개안면성형외과학회지
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• 제14권2호
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• pp.73-80
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• 2013

It is important to distinguish deformational plagiocephaly from craniosynostosis, the two conditions are different with respect to clinical progression and treatment options. Deformational plagiocephaly is diagnosed based on the patient's medical history and physical examination. Until recently, there has been no standardized method of evaluation. Visual assessment, anthropometric assessment, digital scanning, and radiologic evaluation are mostly commonly used modalities for diagnosis and assessment. Treatment of deformational plagiocephaly requires an understanding of natural progression of the disease. Deformational plagiocephaly should be classified according to its severity before the proper method and time for treatment are determined. Treatment includes repositioning, physiotherapy and remodeling with the use of orthotic devices. In general, repositioning is preferred for patients younger than six months old while treatment with the use of orthotic devices such as helmet is preferred for patients over six months old. Moreover, treatment with the use of orthotic devices is also favored for severe plagiocephaly. There is continuing research on the relation between deformational plagiocephaly and developmental delay.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2010년도 추계학술발표논문집 1부
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• pp.107-109
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• 2010

화석연료 사용으로 발생한 환경 문제와 에너지원 고갈로 생성된 새로운 청정에너지에 대한 중요성은 시간이 지나면서 더욱더 증가해 가고 있다. 청정에너지로 알려져 있는 많은 에너지원 중에 태양의 빛에너지를 전기적 에너지로 변환하여 활용하기 위한 연구는 상당히 많이 이루어지고 있다. 태양전지는 공해가 적고, 자원이 무한적이며 반영구적인 수명을 가지고 있어 일부 에너지 문제에 도움을 줄 수 있는 에너지원으로 평가받고 있다. 태양전지 기술 개발 방향은 전지의 변환효율을 높이는 방향과 공정 개발 원가를 줄이는방향의 연구들로 진행되어 오고 있다. 태양전지의 변환 효율은 새로운 물질의 개발과 공정 개발을 통하여 연구가 진행되고 있으며, 발전해온 많은 반도체 기술을 통하여 많은 부분 향상되어 오고 있다. 하지만, 반도체 기술 중에 도핑 기술은 많은 부분을 연구되어 왔지만, 아직도 쉽지만은 않은 기술이다. 이러한 기술이 안정화되지 않고서는 높은 효율의 태양전지의 개발은 어려운 일이다. 본 연구에서는 태양전지 제작하는 공정을 단순화 하고 그 공정 중에 어려운 공정으로 알려진 도핑공정에 대한 연구를 진행하였다. 대양한 공정 조건으로 연구가 이루어 졌으며, 그 변화에 따른 온도변화와 소스의 농도 변화에 따른 면저항 값을 분석하였다.