• Journal of the Korean Institute of Gas
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• v.22 no.1
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• pp.53-59
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• 2018

In Korea, The number of installed LPG Charging stations is about 2000, increasing by 26 every year. In these, about 500 charging stations are older above 15 year, accounting about 25% of total stations. About 86% of them are located in the city, which is causing serious damage if accident occurs. In this paper, we developed a duel gas sensor module and integrated control system software that can prevent and correspondence to gas leaks and fire accidents at LPG/CNG charging stations. The dual type sensor module has the function of collecting and transmitting the measured data to the sensors of methane, butane and hydrogen through RF433Mhz communication. In addition, each sensor is attached with two to improve stability and accuracy. The integrated control system software detects real-time data of the devices measured by the sensors and it send to the PC and smart phone of manager. Therefore, if accident occurs, the manager can check the status of the charging station regardless of time and place.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.30 no.3
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• pp.481-491
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• 2020

The malicious URLs which can be used for sending malicious codes and illegally acquiring private information is one of the biggest threat of information security field. Particularly, recent prevalence of smart-phone increases the possibility of the user's exposing to malicious URLs. Since the way of hiding the URL from the user is getting more sophisticated, it is getting harder to detect it. In this paper, after conducting a survey of the user experiences related to malicious URLs, we are proposing the rule-based malicious URL detection method. In addition, we have developed java library which can be applied to any other applications which need to handle the malicious URL. Each class of the library is implementation of a rule for detecting a characteristics of a malicious URL and the library itself is the set of rule which can have the chain of rule for deteciing more complicated situation and enhancing the accuracy. This kinds of rule based approach can enhance the extensibility considering the diversity of malicious URLs.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.26 no.5
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• pp.1161-1170
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• 2016

In this paper, we provide an authentication technology for verifying dynamic signature made by finger on smart phone. In the proposed method, we are using the Auto-Encoder-based 1 class model in order to effectively distinguish skilled forgery signature. In addition to the basic dynamic signature characteristic information such as appearance and velocity of a signature, we use accelerometer value supported by most of the smartphone. Signed data is re-sampled to give the same length and is normalized to a constant size. We built a test set for evaluation and conducted experiment in three ways. As results of the experiment, the proposed acceleration sensor value and 1 class model shows 6.9% less EER than previous method.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.6
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• pp.4164-4169
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• 2015

In this paper planed Real-time Shopping System using Multipurpose Visual Language System(MVLS) with voice recognition remote controller. This system has a merit that using existing on-line & off-line shopping system with addition MVLS data. This can realization little modification existing shopping system. Also, customer's a point of view that has a merit to using easy device for shopping. That is no more using difficult device like that keyboard or mouse, and approach to easy device that voice recognition remote controller or smart phone. Especially, aspect of the old and the infirm and disabled persons that information minority group, can easy buy the product using this system. And, the sellers can more easily collection customer's data and using that future sales strategy.

• Journal of the Korea Society of Computer and Information
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• v.24 no.10
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• pp.189-194
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• 2019

In the healthcare system, the human neck(cervical spine) is one of the most important organs. The area that supports the human head is the cervical spine. Nowadays, we are often overworked our neck to calls with the smart phone or see the monitors. In this paper, we investigate the abnormalities of lateral flexion and rotation of the cervical spine. The normal angle of lateral flexion is $20^{\circ}$ to $45^{\circ}$ and the normal angle of rotation is $50^{\circ}$ to $90^{\circ}$. If this angle is below normal and we feel pain, there is something wrong with the cervical spine. In addition, learn how to measure the lateral flexion and rotation of the neck or cervical spine, and also to find out how to treat an abnormality. We also look at how to prevent more than lateral flexion and rotation of the cervical spine. The experiment was carried out with 100 people in their 50s, men and women, to find out whether the neck is abnormal.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.67 no.12
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• pp.1641-1647
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• 2018

In this paper, we describe a portable potentiostat which is capable of cyclic voltammetry(CV) and amperometry for electrochemical dissolved oxygen sensor. In addition, this portable potentiostat can also transmit the measured data wirelessly to android devices such as smart phone, tablet, etc. through Bluetooth. The potentiostat system consists of three parts; a voltage generator circuit which is controlled by Arduino nano and 12-bit DAC(digital to analog converter) to generate necessary electric potential for operating the electrochemical sensor, an oxidation/reduction current measurement circuit, and a Bluetooth module to transmit data wirelessly to an android device. Once measurements are carried out with the android application, the measured data is transmitted to the android device via Bluetooth and displayed using the android app. in real time. In this paper, we report the measured reduction current with a fabricated dissolved oxygen sensor in both saturated-oxygen state and zero-oxygen states. The results of the developed portable potentiostat system are in good agreement with those of the commercial portable potentiostat (${\mu}stat200$, Dropsens inc.). The measured peak reduction currents using the developed potentiostat and the commercial ${\mu}stat200$ potentiostat were $-0.755{\mu}A$ and $-0.724{\mu}A$, respectively. The reduction currents measured at zero-oxygen state were $-0.005{\mu}A$ and $-0.004{\mu}A$. The discrepancy between those two systems seems very small, which implies successful development of a portable and wireless potentionstat.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.813-815
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• 2016

This paper implements a device control system based on the brain wave data. Brain-Computer Interface (BCI) technology can pass directly to the system without going through the operation of the language or body. By controlling the device to detect brain waves in real time according to the change of status it helps to ease life for a variety of services, such as disabled people with limited mobility or students, people who need multi-tasking. In addition, it is possible to develop an application service such as the home device control system. A device control system implemented in the paper based on the data collected from the EEG Headset associated to control the power of the smart phone and audio. Control the power ON / OFF operation by the Attention, and support service functions to control the audio by the Meditation and Eye blink. It was confirmed that the device control using the brain wave data to be operated through a laboratory test successfully.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.639-642
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• 2014

If the power of the general is not supplied, Visual aids utilize solar power system. The power supply system of these, the role of the power regulator to manage the charging and discharging is very important. In recent years, by introducing the IT technology for the effective management of visual aids, it was supposed to add a device that uses the power consumption. Thus, the importance of power regulator has increased. Currently, the power regulator is installed inside the AtoN, if the accessibility is not ensured, there is a difficulty that can not be checked. In order to solve these problems, in this paper, you have installed the Blue-tooth module to the power regulator. Also, by using the Blue-tooth communication function of a smart phone, a radio check has implemented a possible monitoring system. Advantage of the system implemented is a simple configuration and low installation cost. Also, it is possible to check the state information of the real-time power supply regulator. In addition, it has the effect of preventing accidents and reducing costs of inspection.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.596-597
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• 2016

Recently a variety of companies as the growing importance of big data are in the process of research and development for large-scale data collection and management. In addition, a situation that collects all necessary data inside and outside the enterprise to improve the manufacturing environment and the service environment. In this paper, we collect to ingest the mouth-time work for companies within the temple. Also, in conjunction with the NFC tag of the smart phone and employee information stored in the database. Utilizing this determines whether or not the employee attendance and the authority to automatically access to the database or resource within the enterprise. The proposed system is considered to be able to increase the accessibility and efficiency of a database or a resource in the enterprise.

• Journal of Convergence for Information Technology
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• v.9 no.10
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• pp.213-219
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• 2019

This study is a descriptive research on the relationship among smartphone addiction, lack of sleep and sleeping hours of undergraduates. The subjects include 280 students enrolled in G university and data were collected from Sep. 6 to Oct. 10, 2018. On average, each score of smartphone addiction, sleeping hours and lack of sleep was $34.79{\pm}7.6$, $6.43{\pm}1.34$ and $10.14{\pm}3.14$ respectively. Smartphone addition had a significantly positive correlation with lack of sleep(r=.277, p<0.01) and a positive correlation with its sub-areas, such as disability in daily life(r=.269, p<0.01), virtual(r=.151, p<0.01), withdrawal(r=.303, p<0.01), tolerance(r=.184, p<0.01). The education and counselling for preventing undergraduates from smartphone addiction and further studies on them are required.