• Journal of the Korean Operations Research and Management Science Society
• /
• v.39 no.1
• /
• pp.101-112
• /
• 2014

PSS (Product-Service System) is a competitive strategy for a service company or a servitized manufacturer. We investigate the product-service integration effect in a mobile phone service industry. Using choice-based conjoint analysis, we measure main and interaction effects of product and service. We collected a sample of size 171 from a college student group in Seoul, Korea. We find the existence of the interaction effect of product and service in PSS and show the direction of PSS strategy using main and interaction effect.

• Journal of the Ergonomics Society of Korea
• /
• v.30 no.5
• /
• pp.651-657
• /
• 2011

Objective: The aim of this study is to investigate the system to integrate and manage the in-vehicle interactions between the drivers and the in-vehicle mobile IT devices. Background: As the mobile IT technology is being used anywhere, the drivers are interacting with the mobile IT device on driving situations. The distraction of the driver's attention causes the car accidents. It is necessary to develop the HVI(Human Vehicle Interface System) to integrate and manage the in-vehicle interactions with IT devices. Method: The HVI System is designed not as the interfacing subject but as the supervising system to monitor the driver's status and support the driver to concentrate on the primary tasks. The HVI system collects the status information of the car and driver and estimate the driving workload. Results: The HVI system controls how to provide the output information based on the driving workload. We implemented the HVI system prototype and applied in the real vehicle with the HVI cell phone and the HVI car navigation system. Conclusion: Depending on the driving situations, the HVI system prevented the information output in dangerous situation and diversified the modality and the intensity of the output information. Application: We will extend the HVI system to be connected the other various IT devices and verity the effectiveness of the system through various experiments.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2002.11a
• /
• pp.53-56
• /
• 2002

VoIP(Voice over IP) 기술은 다양한 인터넷 응용 서비스 보급의 대중화에 기여한 주요 통신기술의 하나이다. 이에 따라 인터넷 이용자가 급격히 증가하고 인터넷 전화의 수요가 증가하게 되었다. 특히, 음성 뿐만 아니라 영상에 대한 기술이 접목되어 V2oIP(Voice and Video over IP) 라 일컬어 지는 기술이 보급되면서, 인터넷 영상전화에 대한 대중화가 이루어 지고 있다. 한편, 다양한 인터넷 응용 서비스 보급의 대중화에 따른 가정 내에서의 네트워크 환경 또한 부각되고 있어 정보가전분야에 큰 변화가 일고 있다. 이에 홈서버 중심의 홈네트워크환경이 구축된다. 따라서, 기존의 pc 를 단말기로 한 인터넷 환경 및 제반 응용 서비스가 그대로 홈서버 중심의 홈네트워크환경으로 옮겨져야 할 필요가 있다. 본 논문에서의 전체 시스템은 임베디드 리눅스 기반인 Qplus 운영체제를 기반으로 하는 홈서버상에 HoCoS(Home Collaboration Service) 시스템이 탑재되며, 이 시스템은 크게 영상전화 시스템과 공동작업 시스템으로 구성된다. 본 논문에서는 상기 시스템 중 SIP(Session Initiation Protocol)기반의 홈서버용 영상전화 시스템에 대한 설계 및 구현에 대해 기술하고자 한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.11 no.2
• /
• pp.253-259
• /
• 2011

In a ubiquitous society, the world is changing to the place where we can access to network anytime, anywhere, on any device. The mobile internet is leading the ubiquitous world and the most commonly used medium is a cell phone. However, it is uncomfortable to link to cafe, blog, and mini homepage. Because we have to stop wap service in order to upload the mobile contents like photos, videos, sound recordings produced by mobile phones. Also we have to re-access. So, in this paper content management system was designed and implemented which mobile users don't have to stop wap service in order to upload photos, videos, sound recordings produced by mobile phones. Also it supports upload in wap service integrative medicine diagnosis and contents can be managed by category.

• Journal of Korea Game Society
• /
• v.11 no.6
• /
• pp.95-102
• /
• 2011

At present, with the rise of smart-phone market supported the Wi-Fi, smart-phone based network content has propagated rapidly. But, network content service is difficult in feature phone and multimedia device not supporting the Wi-Fi or supporting only the bluetooth. This paper was used the zigbee technology supporting low power, low cost, availability, multi channel, broadcasting compared to the bluetooth or Wi-Fi. It will provide a variable network game development by utilizing the zigbee technology. Also, it is provide the development of variable mobile network contents using the zigbee.

• Journal of Digital Convergence
• /
• v.9 no.2
• /
• pp.131-140
• /
• 2011

As the recent advances in network and wireless communications and semiconductor design and process technologies, our computing platform is rapidly shifting from desktop PCs to mobile devices such as UMPC (Ultra Mobile PC), Tablet PC, and Smartphone. Especially, wide-spreading Smartphones allow a new field of application based on location based services available with an user interface called augmented reality (AR). Therefore, this paper introduces an implementation of AR using various OpenAPls on Android Smartphones. In order to utilize enrich user data in real time, the system integrates with location based social network services also with OpenAPI. These APIs enable third-party developers to make use of rich contents of many portal web sites. The prototype was implemented on the real Android phone, Sky Sirius, and the result shows that it can provide an efficient location based service using AR technology without any constraints on mobile devices; in addition, it connects SNS to AR for sharing user data including photos, videos, and messages based on a specific location.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.13 no.1
• /
• pp.35-40
• /
• 2013

The messages on mobile terminal may contain context information such as user's location, time and preference. This paper proposes message forwarding system based on user's context. The server stores the predefined target addresses which may be mobile phone number, web server address and email address. On request for message transmission, the server tries to find a target address matching a user's context. Thus, a sender transmits messages to a representative address without knowing various receiver's addresses and a receiver can retrieve classified messages according to subject/location.

• Journal of Practical Agriculture & Fisheries Research
• /
• v.18 no.1
• /
• pp.101-112
• /
• 2016

Monitoring and control of the greenhouse environment play a decisive role in greenhouse crop production processes. The network system for greenhouse control was developed by using recent technologies of networking and wireless communications. In this paper, a remote monitoring and control system for greenhouse using a smartphone and a computer with internet has been developed. The system provides real-time remote greenhouse integrated management service which collects greenhouse environment information and controls greenhouse facilities based on sensors and equipments network. Graphical user interface for an integrated management system was designed with bases on the HMI and the experimental results showed that a sensor data and device status were collected by integrated management in real-time. Because the sensor data and device status can be displayed on a web page, transmitted using the server program to remote computer and mobile smartphone at the same time. The monitored-data can be downloaded, analyzed and saved from server program in real-time via mobile phone or internet at a remote place. Performance test results of the greenhouse control system has confirmed that all work successfully in accordance with the operating conditions. And data collections and display conditions, event actions, crops and equipments monitoring showed reliable results.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.13 no.4
• /
• pp.1849-1856
• /
• 2012

This paper proposes a method to track the center of pupil and perform the remote control for interface based on the substituted commands according to movements of pupil under smart phone environment. The proposed method, which is a remote control through the movement of eyes, may be helpful for the handicapped people or users who want a more convenient input method. A method based on webcam, which is representative one among the previous methods to track pupil of user, has a few limitations on distance and angle between location of user and webcam. However, this paper uses smart phone that is convenient to carry. The proposed method can perform the remote control through tracking of pupil using wireless network without any restriction on the location of users. Thus, the method is effectively applied for controlling the smart TV that should be controlled on the distance as well as the remote control for PC.

• Journal of Advanced Navigation Technology
• /
• v.19 no.3
• /
• pp.217-223
• /
• 2015

This paper describes the design and implementation of a network system for UAV for multiple clients that enables long-range operation based on a commercial mobile network. A prototype data modem is developed with a commercial embedded M2M module in order to provide an access to the mobile network. A central server with a database is constructed to record all of real-time flight and video data and communicate with a ground control system. A GCS is developed for the central control, the single UAV and the smart phone version to be used for different purposes. Performance tests were progressed for data delay, video frame rate and state of clients. Flight tests were also performed to verify the reliability of the modem with respect to altitude.