• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.3
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• pp.569-575
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• 2014

These days as smart TVs or android set top boxes have come into wide use, VoIP(Voice over Internet Protocol) services such as the Skype which can beused on computer system, can be also accessed by smart TVs or set top boxes. and the various kinds of distance learning programs have been developed on smart TVs or set top boxes. but when users have utilized a webcam with smart TVs or set top boxes, users have to go in front of smart TVs or set top boxes In this research paper, the new technology can be solved the problem of webcam use according to chaned environment. This tech is related with the wireless webcam one which can be applicable to open spaces such as living room with some distance between user and smart TV. There are few problems in long distance the test results show high reliability in living room with some distance.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.4
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• pp.581-586
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• 2018

A common characteristic of many patients whose illness is getting worse is that they miss the treatment red flag. When high subjective symptoms appear or there is no strong pain, this problem arises because it is reluctant to visit the hospital. Gingivitis causes bleeding from the gums in the early and mid-term, and shows mild symptoms of tooth collapse. When treatment is done at this point, it shows a very high effect. However, when you miss the timing of treatment you will have a situation where you can't eat food by causing serious problems in the health of the gums and oral cavity. In this paper, the patient's periodontal image is photographed with a smartphone and transmitted in real time. This is done by the doctor in charge. Then, we propose a design of a patient management system that provides information on the current situation to the patient so as not to miss the timing of treatment.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.27 no.5
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• pp.1033-1047
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• 2017

Traditional explicit authentication, which requires awareness of the user's authentication process, is a burden on the user, which is one of main reasons why users tend not to employ authentication. In this paper, we try to reduce such cost by employing implicit authentication methods, such as biometrics and location based authentication methods. We define the 4-level security assurance model, where each level is mapped to an explicit authentication method. We implement our model as an Android application, where the implicit authentication methods are touch-stroke dynamics-based, face recognition based, and the location based authentication. From user experiment, we could show that the authentication cost is reduced by 14.9% compared to password authentication-only case and by 21.7% compared to the case where 6-digit PIN authentication is solely used.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.27 no.5
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• pp.1107-1115
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• 2017

The most commonly used PKZIP format is a ZIP file, as well as a file format used in MS Office files and application files for Android smartphones. PKZIP format files, which are widely used in various areas, require structural analysis from the viewpoint of digital forensics and should be able to recover when files are damaged. However, previous studies have focused only on recovering data or extracting meaningful data using the Deflate compression algorithm used in ZIP files. Although most of the data resides in compressed data in the ZIP file, there is also forensically meaningful data in the rest of the ZIP file, so you need to restore it to a normal ZIP file format. Therefore, this paper presents a technique to recover a damaged ZIP file to a normal ZIP file when given.

• KIPS Transactions on Computer and Communication Systems
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• v.4 no.5
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• pp.161-170
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• 2015

This research aims to propose new direction of mobile collaborative service by supplying functional supports which surpass data resource in smart devices. In this paper, we present Smart Collaboration Service Model that supports two types of collaboration, so called Supplying Collaboration and Sharing Collaboration. This model is a platform for supporting the resources as follows; sharing of data contact in other devices and supplying of special functions, like camera operation and picture transmission from other devices. To show its applicability, a prototype of Smart Collaboration Service Model has been implemented in the Android application for exchanging contact data and renting camera function. We expect that Smart Collaboration Service Model is to help the emergence for a new type of collaboration service. Also, user can reduces resource wastes for device as well as form personal smart space by utilizing all devices owned.

• KIPS Transactions on Software and Data Engineering
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• v.2 no.2
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• pp.145-150
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• 2013

A film colored overlay has been used as an assistive device for dyslexics, Recently, several virtual colored overlays which can be used in computer were developed. But mobile virtual overlay has not been developed yet. In this paper, I implemented a mobile overlay application which is based android operating system and displays a colored overlay of screen all the time while user can freely interact with rest of apps in normal manner by using root window and service. A method is presented to determine the source color of a virtual overlays by estimating alpha value of alpha blending algorithm through measurement of the chromaticity and transmissivity of film overlays and I implemented all colors which are presented by using Intuitive Overlays. Test results of the developed virtual overlay show that all colors of the overlays are almost identical to the colors of Intuitive Overlay by using the chroma meter CS-200A.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.569-572
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• 2014

많은 사람들이 자동차를 교통수단으로 이용함에 따라서 다양한 자동차 액세서리 및 관심을 가지게 되면서, 자동차에서 다양한 여가 활용을 즐길 수 있게 되었다. 그와 함께 스마트폰 보급이 활성화가 되게 되면서 음악을 스마트폰으로 이용하여 들으면서 차에서도 많이들 활용하게 되었다. 하지만, 이러한 스마트폰 사용을 하게 됨으로 인해서 자동차 안에서 스마트폰을 사용하여 사고가 일어나는 빈도가 점점 많아지게 되었다. 그로 인해서 운전자들이 안심하고 사용할 수 있는 어플리케이션 개발이 필요로 하게 되었다. 현재 나와 있는 어플리케이션 중에 Bugs Driver라는 음악 재생 어플리케이션이 있지만, 이 어플리케이션은 차량 운전자를 위한 특별한 기능을 가지고 있지는 않고, 기존 음악 어플리케이션에서 기능을 축소한 음악 어플리케이션이다. 또한, 직관적이지 않은 UI(User Interface)를 가지고 있으며, 속도 또한 충분히 빠르지 않아 운전자가 이용하기에 적합한 어플리케이션이 아니다. 이에 본 연구에서는, 차량 안에서도 안전하고 편리하게 사용할 수 있는 음악 어플리케이션을 개발하였다. 이 어플리케이션은 움직임을 최소화 할 수 있는 UI 와 모션인식을 이용한 어플리케이션 조작, 일정 속도 이상으로 주행 시 어플리케이션을 조작하지 못하도록 하는 기능을 가지고 있다. 음악 관련 정보는 (주)네오위즈의 벅스 어플리케이션 API 를 이용하였고, 모션인식은 OPENCV를 이용하여 구현 하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.4
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• pp.700-710
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• 2017

In the revision of the national curriculum, various creative activities and career activities are highlighted under the goal of fostering creative talent. Following the implementation of this policy, which is represented by creative activities, teachers are burdened with comprehensive responsibilities, such as planning and executing safety procedures and preventing accidents. Existing systems for teacher management had limitations that allowed only the provision of standardized information and management. The main purpose of this study is to help teachers manage their classes systematically through a class management system. The teachers' overall management system includes several functions, such as checking students' locations, registering students' reviews, or registering various kinds of activities for the creative experiential activities of the curriculum. This system not only helps teachers to systematically manage the creative experiential activities, but also allows teachers to share the history of their activities with each other. Furthermore, this system will be helpful in achieving the objectives of the revised curriculum.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.7
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• pp.100-106
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• 2015

In this paper, we propose a fast algorithm for low-power image enhancement method for mobile LCD. In the proposed fast algorithm, the spatial resolution of the input image is significantly reduced, and the image characteristics are analyzed on the reduced resolution image to find a dimming rate adaptive to the image content, thereby saving power. The proposed fast adaptive dimming and image enhancement algorithm is implemented as an application that runs on an Android device. Image quality evaluation and running time analysis experiments on the device indicate that the proposed fast algorithm jointly minimizes the quality degradation and power consumption, reducing the required computation load by over 95%.

• Journal of Advanced Navigation Technology
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• v.23 no.5
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• pp.473-480
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• 2019

The smart home is a technology that can monitor and control by connecting everything to a communication network in various fields such as home appliances, energy consumers, and security devices. The Smart home is developing not only automatic control but also learning situation and user's taste and providing the result accordingly. This paper proposes a model that can provide a comfortable indoor environment control service for the user's characteristics by detecting the user's behavior as well as the automatic remote control service. The whole system consists of ESP 8266 with sensor and Wi-Fi, Firebase as a real-time database, and a smartphone application. This model is divided into functions such as learning mode when the home appliance is operated, learning control through learning results, and automatic ventilation using indoor and outdoor sensor values. The study used moving averages for temperature and humidity in the control of home appliances such as air conditioners, humidifiers and air purifiers. This system can provide higher quality service by analyzing and predicting user's characteristics through various machine learning and deep learning.