• 정보과학회 컴퓨팅의 실제 논문지
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• 제21권3호
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• pp.215-222
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• 2015

사물인터넷을 이용한 디지털 도어락, DDiT를 소개한다. DDiT에서는 기존의 디지털 도어락을 제어하기 위하여 통합 마이크로 컨트롤러 플랫폼인 아두이노를 이용하였으며 모바일 플랫폼으로는 안드로이드 스마트폰을 사용하였다. DDiT의 장점 중 하나는 기존의 디지털 도어락에 부착해서 사용할 수 있는 형태로 스마트폰 애플리케이션을 열쇠로 활용하는 방식이라는 점이다. 더구나, 스마트폰 애플리케이션을 사용하므로 이를 통해서 여러 가지 부가적인 기능도 수행할 수 있다. 따라서, 사물인터넷을 이용한 디지털 도어락은 일반 가정집 도어락은 물론 호텔, 연구실, 및 회사와 같은 높은 보안을 필요로 하는 장소에까지 다양한 분야에서 효과적이고 편리하게 활용될 수 있을 것이다.

• Journal of information and communication convergence engineering
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• 제9권1호
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• pp.1-5
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• 2011

Everyday, technology is evolved in many different disciplines. Computer and smart devices revolution take part of the evolved technology that continuously promising new features. Moreover, social networks services recently become widely popular, which most people in the world become a social-network-fond. In addition to the revolution of the evolved technology and social networks services, ubiquitousness is taking significant part in our daily lives. Although, there are many e-learning systems already existed, which use Internet technology along with a Web technology to provide education in various ways, in despite of that, there is no such existing system exploits the usefulness of smart devices along with the legacy of the online social networks besides the power of the ubiquitous computing technology. Therefore, we propose a smart device application, which fills the gap that has been missing in the recent contemporary era. It is an application that runs on smart devices particularly Smartphone devices; we call our system “Smart Device based Social E-learning System(SDES)”. We have preliminary implemented our system on Android OS. In this paper, we intentionally propose the system in order to ease the way people learn, to provide interactive accessibility in our system, and to utilize the advanced technology more wisely.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 춘계학술대회
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• pp.669-670
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• 2016

본 연구에서는 운동부 지도자들이 학생 선수들의 결과 데이터를 핫 존(Hot Zone)과 콜드 존(Cold Zone)으로 구분하여 지도에 참고할 수 있는 어플리케이션을 개발하였다. 본 연구에서 개발된 종목은 농구이다. 운동부 지도자들은 학생 선수들의 득점 확률이 높은 곳을 분석할 수 있고, 이를 이용하여 훈련 성과를 더욱 높일 수 있다. 그리고 학생 선수들도 축적된 데이터를 통하여 자신의 장단점을 파악하여 동기 부여와 경기력 향상을 기대할 수 있으며, 이에 따른 후속 연구를 할 수 있을 것으로 기대한다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2013년도 전력전자학술대회 논문집
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• pp.126-127
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• 2013

In industry, Supervisory Control and Data Acquisition (SCADA) system plays critical role to ensure production is monitored and controlled rigorously and in timely manner. Having a cost saving yet still effective SCADA system would be much desired by Industry. SCADA itself is a field with constant development and research like how this paper investigates on creating an extremely low cost device, which can be adapted to many different SCADA applications through some very basic programming when combined with relevant peripherals. Much of the process in some expensive SCADA application based on smartphone application is due to specialized communication infrastructure. This paper addresses the needs by developing low cost and integrated wireless SCADA system. The system features capability on accessing the performance of remotely situated device parameter, such as temperature, control analog or digital input output on real time basis. We use existing mobile network capability through Bluetooth communication channel.

• Journal of Construction Engineering and Project Management
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• 제8권1호
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• pp.10-21
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• 2018

Many construction projects involve a plethora of safety-related problems that can cause loss of productivity, diminished revenue, time overruns, and legal challenges. Incorporating data collection and analytics methods can help overcome the root causes of many such problems. However, in a dynamic construction workplace collecting data from a large number of resources is not a trivial task and can be costly, while many contractors lack the motivation to incorporate technology in their activities. In this research, an Android-based mobile application, Preemptive Construction Site Safety (PCS2) is developed and tested for real-time location tracking, trajectory prediction, and prevention of potential collisions between workers and site hazards. PCS2 uses ubiquitous mobile technology (smartphones) for positional data collection, and a robust trajectory prediction technique that couples hidden Markov model (HMM) with risk-taking behavior modeling. The effectiveness of PCS2 is evaluated in field experiments where impending collisions are predicted and safety alerts are generated with enough lead time for the user. With further improvement in interface design and underlying mathematical models, PCS2 will have practical benefits in large scale multi-agent construction worksites by significantly reducing the likelihood of proximity-related accidents between workers and equipment.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 춘계학술대회
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• pp.585-588
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• 2010

최근 애플의 아이폰과 구글의 안드로이드폰 출시로 스마트 폰에 대한 관심이 증가하고 있다. 일반 PC 어플리케이션과 마찬가지로 스마트 폰에서도 멀티미디어 컨텐츠의 활용은 중요할 것이다. 여기서 멀티미디어 컨텐츠란 대표적으로 이미지와 동영상을 말한다. 이미지와 동영상 컨텐츠를 위해 사용되는 대표적인 코덱으로 JPEG과 MPEG 그리고 최근에 동영상 코덱으로 각광 받고 있는 H.264가 있다. 본 논문에서는 JPEG와 H.264로 압축된 raw sequences를 사용한다. 본 논문은 Iphone의 LCD상에 소켓으로부터 들어오는 Jpeg과 H.264 raw sequences를 어떻게 효율적으로 디코딩 및 출력해 줄 것인지에 대해서 제시한다. 그리고 이를 실제 구현을 통해서 시뮬레이션한 결과를 보여준다.

• Journal of Information Processing Systems
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• 제10권4호
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• pp.618-627
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• 2014

Nowadays mobile users are using a popular service called Location-Based Services (LBS). LBS is very helpful for a mobile user in finding various Point of Interests (POIs) in their vicinity. To get these services, users must provide their personal information, such as user identity or current location, which severely risks the location privacy of the user. Many researchers are developing schemes that enable a user to use these LBS services anonymously, but these approaches have some limitations (i.e., either the privacy prevention mechanism is weak or the cost of the solution is too much). As such, we are presenting a robust scheme for mobile users that allows them to use LBS anonymously. Our scheme involves a client side application that interacts with an untrusted LBS server to find the nearest POI for a service required by a user. The scheme is not only efficient in its approach, but is also very practical with respect to the computations that are done on a client's resource constrained device. With our scheme, not only can a client anonymously use LBS without any use of a trusted third party, but also a server's database is completely secure from the client. We performed experiments by developing and testing an Android-based client side smartphone application to support our argument.

• 로봇학회논문지
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• 제16권3호
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• pp.276-282
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• 2021

The system for recognizing text in natural scenes has been applied in various industries. However, due to the change in brightness that occurs in nature such as light reflection and shadow, the text recognition performance significantly decreases. To solve this problem, we propose an adversarial shadow generation and training algorithm that is robust to shadow changes. The adversarial shadow generation and training algorithm divides the entire image into a total of 9 grids, and adjusts the brightness with 4 trainable parameters for each grid. Finally, training is conducted in a adversarial relationship between the text recognition model and the shaded image generator. As the training progresses, more and more difficult shaded grid combinations occur. When training with this curriculum-learning attitude, we not only showed a performance improvement of more than 3% in the ICDAR2015 public benchmark dataset, but also confirmed that the performance improved when applied to our's android application text recognition dataset.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 춘계학술대회
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• pp.661-664
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• 2014

스마트폰 및 태블릿과 같은 모바일 기기의 보급이 보편화되면서, 모바일 애플리케이션의 사용도 크게 높아지고 있다. 그러나, 모바일 기기는 PC와 달리 한정된 인터페이스의 특성으로 인해 장애인과 고령자가 사용하기에는 많은 어려움이 있다. 정부에서는 모바일 애플리케이션 서비스 제공자가 장애인과 고령자 등의 접근성을 보장하기 위해 애플리케이션 제작시에 지켜야 할 사항으로 '모바일 애플리케이션 접근성 지침'이라는 규정을 제정하였다. 본 논문에서는 이 지침을 분석하여 모바일 애플리케이션 설계시에 고려해야 할 점과 구글 및 애플의 접근성 적용사례에 대해 알아본다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2013년도 춘계학술발표대회
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• pp.621-624
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• 2013

Mobile Cloud Computing is today's emerging technology. Customers enjoy the services and application from this combination of mobile technology and cloud computing. Beside all these benefits it also increases the concerns regarding privacy of users, while interacting with this new paradigm One of the services is Location based services, but to get their required services user has to give his/her current location to the LBS provider that is violation of location privacy of mobile client. Many approaches are in literature for preserve location privacy but some has computation restriction and some suffer from lack of privacy. In this paper we proposed a novel idea that not only efficient in its protocol but also completely preserves the user's privacy. The result shows that by sharing just service name and a large enough geographic area (e.g. a city) user gets required information from the server by doing little client side processing We perform experiments at client side by developing and testing an android based mobile client application to support our argument.