• Transactions of the Korean Society of Machine Tool Engineers
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• v.15 no.2
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• pp.1-9
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• 2006

As consumers in optics, electronics, aerospace and electronics industry grow, the demand for ultra-precision aspheric surface lens increases higher. To enhance the precision and productivity of ultra precision aspheric surface micro lens, the development of ultra-precision grinding system and process for the aspheric surface micro lens are described. In the work reported in this paper, an ultra-precision grinding system for manufacturing the aspheric surface micro lens was developed by considering the factors affecting the ground surface roughness and profile accuracy. This paper deals with mirror grinding of an aspheric surface micro lens by resin bonded diamond wheel and spherical lens of BK7. The optimization of grinding conditions on ground surface roughness and profiles accuracy is investigated using the design of experiments.

• Journal of Korea Society of Digital Industry and Information Management
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• v.9 no.1
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• pp.177-188
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• 2013

As the number of smart phone users increases, many organizations begin to adopt social media rapidly to diversify communication channels with customers. Specifically, micro-blog, which supports instant and two-way communications between users and between organizations and users, has been adopted by many organizations as an efficient way not only to identify new customers but also to retain existing customers. The purpose of this study is to investigate the usage motivation and satisfaction of enterprise twitter based on use and gratifications perspectives comparing with Korea and China. Based on prior studies on use and gratifications of internet-related media, information seeking, pleasure/entertainment, relationship, communication, and incentives were identified as usage motivations of enterprise Micro-blog. This study contributes to provide the base of activation strategies and practical implications for micro-blog as a marketing tool.

• The Journal of Information Systems
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• v.20 no.4
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• pp.145-162
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• 2011

Recently Micro-blog service is used quickly in our life with dissemination of Smart-phone. This study performed based on a view that there is a difference of user's intention to reuse Web-blogs & Micro-blogs. This study also based on the existing motive theory for using which considers five factors-information, entertainment, interaction, personalization, and convenience. The AMOS structure equation used for the analysis of users' revisit intention. The results of the study shows that Micro-blogs are influenced by entertainment, personalization, and convenience. On the other hand, Web-blogs are influenced by entertainment, and personalization.

• Smart Media Journal
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• v.2 no.3
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• pp.23-33
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• 2013

In this paper, we find out about the effort and status of GwangJu metropolitan city to reinvigorate traditional market. And we propose the micro payment model based on Android NFC and tokenization technique to support the small trader's micro payment in aspect of information technology more than the physical infrastructure and environmental improvement projects to reinvigorate the traditional market. The micropayment model supports facilities of payment using smart phone based on NFC, and the encryption and tokenization support the indirection authentication and privacy of users.

• Journal of IKEEE
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• v.22 no.1
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• pp.93-97
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• 2018

In this paper, it proposes a method that uses an air pump to inject oxygen to water directly to prevent the growth of algae and cyanobacterium using MCU(Micro Controller Unit). MCU can control itself with modules of GPS, a sonic sensor, camera, conveyer belt and water pump to remove and prevent growths of algae. It can also be connected to the smart phone application software to track the system where it is and it can be controlled by the user interfaced with the smart phone application.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.4
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• pp.607-614
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• 2017

In this research, buck converter was designed and manufactured to improve the wireless charging of smartphone through PWM control technology based on micro controller. A feedback control circuit was fabricated using a voltage sensor so that the output voltage follows the reference voltage. The buck converter, 311V is output as 12V, DC voltage 12V is connected wirelessly, and 5V charge voltage is output. We also confirmed the availability of the buck converter for wireless charging of smart phone through experiments.

• Journal of Korea Multimedia Society
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• v.9 no.3
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• pp.360-368
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• 2006

Recently, performance of the mobile phone has increased dramatically. Due to this, it is possible to integrate various biotechnology. There are many ventures to integrate biotechnology with mobile phone, because of increasement interest of peoples well-being. The transcutaneous electrical nerve stimulation can Improve the circulation of blood and suppress a pain. To integrate the transcutaneous electrical nerve stimulation with mobile phone, it is necessity to make small, low power, and safe module. In this paper, the transcutaneous electrical nerve stimulation module is designed and implemented by small boost convertor. The value of tank capacitor, which is the total stimulus energy to human, can be chosen to insure safe condition. The confirm the of operation of designed module, a small micro-controller is used to make system and test the module. The implemented system is small and consumes a low enough power to be integrated with mobile phone.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.2
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• pp.1005-1018
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• 2017

This paper proposes an App Visualization (AppV) based on IoT Self-diagnosis Micro Control Unit (ISMCU) for accident prevention. It collects a current status of a vehicle through a sensor, visualizes it on a smart phone and prevents vehicles from accident. The AppV consists of 5 components. First, a Sensor Layer (SL) judges noxious gas from a current vehicle and a driver's driving habit by collecting data from various sensors such as an Accelerator Position Sensor, an O2 sensor, an Oil Pressure Sensor, etc. and computing the concentration of the CO collected by a semiconductor gas sensor. Second, a Wireless Sensor Communication Layer (WSCL) supports Zigbee, Wi-Fi, and Bluetooth protocol so that it may transfer the sensor data collected in the SL to ISMCU and the data in the ISMCU to a Mobile. Third, an ISMCU integrates the transferred sensor information and transfers the integrated result to a Mobile. Fourth, a Mobile App Block Programming Tool (MABPT) is an independent App generation tool that changes to visual data just the vehicle information which drivers want from a smart phone. Fifth, an Embedded Module (EM) records the data collected through a Smart Phone real time in a Cloud Server. Therefore, because the AppV checks a vehicle' fault and bad driving habits that are not known from sensors and performs self-diagnosis through a mobile, it can reduce time and cost spending on accidents caused by a vehicle's fault and noxious gas emitted to the outside.

• Journal of Advanced Navigation Technology
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• v.17 no.1
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• pp.47-55
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• 2013

In this paper, we propose the micropayment model based on NFC, authentication, and privacy technique to support micro-payment in aspect of information technology to reinvigorate the traditional market. The micropayment model supports facilities of payment using smart phone based on NFC, and the encryption and tokenization support the functions of MD authentication, indirection authentication, and privacy of user's payment.

• Journal of Advanced Navigation Technology
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• v.16 no.4
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• pp.665-672
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• 2012

In this paper, we find out about the effort and status of GwangJu metropolitan city to reinvigorate traditional market. And we propose the micro payment model based on Android NFC and tokenization technique to support the small trader's micro payment in aspect of information technology more than the physical infrastructure and environmental improvement projects to reinvigorate the traditional market. The micropayment model supports facilities of payment using smart phone based on NFC, and the encryption and tokenization support the indirection authentication and privacy of users.