• Journal of Internet Computing and Services
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• v.13 no.2
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• pp.51-57
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• 2012

The warming up of the recent competition in the smart phone industry followed by rapid increase of open platforms and app stores have led the mobile terminals to adopt the general purpose operating system. The mobile device utilizing this OS is vulnerable to mobile malignant code which is highly transferable. As a result, the scale of mobile attack and harm increase. However, compared to the malicious code and virus which keep increasing, the elements for security to prevent are insufficient. Therefore, this paper describe about the Context Aware Service that eliminates the potentially risky elements on the smart phone service, which could threaten the usability of the service including invasion of personal information. The proposed system prevents from disclosure of personal information by giving the procedure of information, and realizes the service that is able to change the sequence of identifying the users' information to prepare for emergency.

• The Journal of the Korea Contents Association
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• v.17 no.11
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• pp.9-17
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• 2017

In this paper, we propose a method to develop a multimeter which is used for measuring electric signals in industrial field by using battery and display of smart phone. Most of the multimeters that are linked to existing smartphones are connected to Bluetooth, which is inconvenient for battery use and low in measurement accuracy. To improve this, we developed smart multimeter that can supply power and data at the same time by USB OTG method which can be used by sharing the power of smartphone. We also developed a smart multimeter that can measure resistance, DC voltage, current, AC voltage and current. Developed an Android app with a button that displays measurement data and can select the type of electric signal to be measured, and tests whether the manufactured system is operating normally or not. Respectively.The results of this study confirm that it is possible to fabricate a smart meter that has equal or better performance compared to existing instruments and does not require a separate power source or display, and it is expected to be a reference for the development of various smart instruments in the future.

• Journal of Advanced Navigation Technology
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• v.21 no.1
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• pp.72-77
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• 2017

In recent years, internet of things (IoT) technology has developed rapidly and has been applied in many fields. IoT devices collect and analyze information in various environments and provide useful information to users. Due to the recent increase in IoT devices, many open source platforms based on hardware and software that are cheap and easy to use have been developed and provided. In this paper, we have studied the IoT system based on Arduino which can communicate Bluetooth wireless data with smart phone in real time. And we have developed a wireless system control app based on App Invertor 2 for communication with Android smart phone. Also, we propose an IoT system based on Arduino which can control the devices and implement the function of connectivity between devices.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.8
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• pp.1711-1716
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• 2012

Vocational rehabilitation is defined as a process which helps people with disabilities to maintain life of non-disabled people and vocational assessment is a part of it. Traditionally, vocational assessment is performed through using of assessment tools or vocational counseling, but assessment tools are very expensive and we should move to the facilities for the disabled. It is very efficient to apply vocational assessment to people with disabilities using the smart phones which users are expected to surpass thirty million in 2012, because it enables them to access anytime and anywhere. In this paper, we design and implement the mobile aptitude test system on android smart phone OS for people with disabilities. We develop the mobile aptitude test system using the Holland Test which is the assessment tool of career guidance and counseling.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.2
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• pp.357-372
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• 2012

Existing e-learning systems not only require complex admission processes but also do not give stepwise education methods according to individual learners' characteristic. These circumstances cause learners to lose educational interest so that their educational efficiency decreases. In particular, the present e-learning systems do not provide educational approaches suitable for infant and elementary children. Under this system, the e-learning education for children does not proceed completely without guardians. To solve this problem, we design and implement an English e-learning system for elementary children based on friendly and comfortable user interfaces. For children, the proposed system reflects their age and individual interesting per each e-learning stage. This system supports both the Web application platform and smart phone application platform for various client requirements. The proposed system manages 3 classes as English learning content. Learners can experience their own English e-learning course in each class, which is compiled by current educational ability. In addition to the general functions in e-learning system, the proposed system develops content buffering algorithm to reduce data traffic in server.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.248-251
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• 2011

Vocational rehabilitation is defined as a process which helps people with disabilities to maintain life of non-disabled people and vocational assessment is a part of it. Traditionally, vocational assessment is performed through using of assessment tools or vocational counseling, but assessment tools are very expensive and we should move to the facilities for the disabled. It is very efficient to apply vocational assessment to people with disabilities using the smart phones which users are expected to surpass ten million in 2011, because it enables them to access anytime and anywhere. In this paper, we design and implement the mobile aptitude test system on android smart phone OS for people with disabilities. We develop the mobile aptitude test system using the Holland Test which is the assessment tool of career guidance and counseling.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.6
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• pp.145-152
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• 2019

Parkinson's disease(PD) is one of the three major senile diseases and the incidence rate is increasing worldwide as the population ages. And as the disease progresses, time and economic costs increase, so it is important to understand the progress of the disease and to diagnose it early In this paper, we propose a method for pre-screening Parkinson's disease using a smartphone. The contents of the developed application are composed of tapping, tremor, spiral drawing, and gait based on Part III of the Unified Parkinson's Disease Rating Scale. This can be used to quantitatively diagnose Bradykinesia, Tremor and Postural Instability, which are known as motility symptoms of Parkinson's disease, and to monitor the progress of symptoms. This method is expected to be useful for the diagnosis and treatment of Parkinson's disease.

• Journal of the HCI Society of Korea
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• v.12 no.1
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• pp.25-32
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• 2017

The purpose of this study is to evaluate the effectiveness of one-handed interaction modes for supporting the dead zone that users must be difficulty in performing the touch manipulation with only one hand. For the purpose, this study analyzed two existing one-handed modes in iPhone and Android smartphones, and proposed and implemented two additional one-handed modes. In order to investigate effectiveness of the one-handed modes, we performed the experiment that compared normal touch mode with the four one-handed modes. Experimental results showed that all one-handed modes required more time than normal touch mode because of the time requiring in both mode change and recognition. However, the participants had difficulty in manipulating continuous touches at dead zone area with only normal touch. Moreover, the subjective satisfaction was high in one-handed modes thanks to touch convenience and smooth transition effects in mode change. In special, the one-handed mode at iPhone was the most effective out of the tested modes.

• Journal of Digital Contents Society
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• v.13 no.3
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• pp.431-438
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• 2012

Recently, many mobile applications have been developed and published by increasing popularity of smart phone's market. However, a lack of research work is an issue for mobile applications' favoritism to users. In this paper, we have determined the acceptance factors on the existing smart phone applications in order to fit into mobile user's requirements. In addition, we have defined the modification of acceptance factors which are the interesting element of mobile applications, code users reviews of top 20 paid applications among android market applications, and analyse on what element can attract users' interest of mobile applications. As a result, we propose a development method of mobile applications based on the analyzed interesting elements. Our contribution is to provide useful information to mobile application companies for helping them to develop and publish successful mobile applications.

• Journal of Korean Society for Quality Management
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• v.40 no.3
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• pp.245-258
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• 2012

Purpose: Recently, many quality issues are aroused in military forces, such as failures in K-series weapons, combat boots defects and 40mm ammunition explosion accident. To address these problems, the one and only government defense quality assurance agency, DTaQ(Defense Agency for Technology & Quality) tried to improve many quality assurance procedures and introduced new systems such as MRA(Manufacturing Readiness Assessment), TRA(Technology Readiness Assessment), and etc. However, as the amount of war supplies increasing every year, the resource(budget and manpower) for quality assurance is limited. Therefore, DTaQ had difficulty to handle the issue efficiently and effectively, and we propose the method to address this problem. Methods: The most popular quality assurance technique is a sampling method, in this research, we first review the many sampling techniques and compare the strength and weakness of each method. After then, we selected the most appropriate sampling techniques and applied the procedures in combat force support material and ammunition areas. Results: We can reduce the number of samples dramatically, thus the required amount of labor time and money can be saved. Also, the new sampling technique enforces the supplier to produce the product which meets the target value(desirable value). Conclusion: We can reduce the number of samples dramatically, thus the required amount of labor time and money can be saved. Also, the new sampling technique enforces the supplier to produce the product which meets the target value(desirable value). Lastly, since the new sampling method requires many numerical calculations, we developed a simple android OS smart-phone application which can be used easily in field.