• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1823-1825
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• 2005

In this paper, we propose the system that can monitor and control the camera in the remote place using the PDA. The server PC attached to the PLC(Programmable Logic Controller) acquires the current status(On/Off) of the devices through the RS-232 serial communications. Also, the moving image frames captured from the wireless camera is compressed in the JPEG format and is stored in the server. The PDA, which is connected to the server through wireless internet, receives the data about the status of the devices and controls the devices according to the circumstances of them. Also, it can receive the images from the server simultaneously. So, we can monitor and control the specified area in the remote place using the PDA through the wireless communication.

• Journal of Internet Computing and Services
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• v.5 no.3
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• pp.99-108
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• 2004

We have designed and implemented a Voice Messenger System(VMS) for sending and receiving voice data in order to measure and analyze the performance of a multimedia data transfer system using PDAs(Personal Digital Assistants) in a fast wireless LAN environment. The VMS has been configured as an infrastructure network by integrating a wireless intra-network based on IEEE 802,11 b standard with a wired network based on Ethernet. A sending time, a receiving time and a round-trip time(RTT) have been measured by varying its pecket size from 256 to 6656 bytes, Besides, we have performed the experiments to see which NIC is more stable between CF and PCMCIA type in such a wireless LAN environment, The results of such experiments show that the NIC with PCMClA type is better than that with CF type from the points of both efficiency and stability. The performance of a notebook computer with the attachment of a wireless NIC that is used as a VMS client is almost constant by varying its packet size when transferring voice data. However, with PDA client, in the case of receiving packets from the VMS server, the performance is the best when the pecket size is 6656 bytes, In addition, in the case of sending packets from PDA client to the VMS server, the performance is the best when the packet size is 4096 bytes. Even with the same pecket size, the time of receiving packets from the VMS server to PDA is longer than the time of sending packets from PDA to the VMS Server, Thus, we conclude that when PDA is used as a client by applying different pecket size when sending and receiving packets should be achieved a better performance over a wireless LAN environment.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.6
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• pp.1530-1536
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• 2007

In this paper, a mobile banking system which can provide banking services is introduced. Since a PDA has excellent features like a small-size computer and provides mobility, it has been widely used by salesmen. Therefore, if general banking services can be provided with PDA by using wireless technology, it will be very useful. In addition, it is easy to develop and maintain the client software of PDA because it uses Windows-based operation systems. In this paper, a PDA banking system is introduced. The system is designed and developed based on the techniques of wireless network, security and PDA programming to be used for mobile banking and a prototype system is developed. Moreover, we used the object-oriented modeling technique, UML and Java Beans for programming.

• Journal of the Korea Society of Computer and Information
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• v.10 no.2 s.34
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• pp.179-186
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• 2005

This study is to develop PDA_based surveying mapping system. This object is achieved by developing wireless communication module of PDA which is adaptable to Total Station and GPS. and contents for its usage. This system will be efficiently used to surveying parts of spatial location information for real time mapping and improving the modification of survey data.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.9 no.5
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• pp.73-78
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• 2009

We researched economic efficiency and possibility of game portal service based PDA/Smart phone by popularize of next generation portable internet WiBro. PDA/Smart phone are difficult to equal level content service with PC, because of it has low CPU and memory than PC. This paper are implemented paper of integrated server of Cable or Wireless for WiBro contents. In this research, we implemented and show test result of CP killer contents in PDA. It can apply to WiBro portable internet and has required many functions in integrated server for cable or wireless. CP Killer contents for WiBro portable internet is developed by PC server base on Window XP. It can accept next generation wireless LAN, portable internet and ubiquitous issues. We expect activation of commercial use that WiBro contents and server trading.

• Proceedings of the Korea Contents Association Conference
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• 2004.11a
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• pp.302-307
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• 2004

It need remote storage system using iSCSI to overcome a limit of PDA storage device used in currently wireless network environment, and IPSec to solve a security problem of wireless environment increasing continually. In this paper, it design and implement iSCSI to use a remote storage system on PDA, and IPSec for security. The experimental results in real environment show a system performance.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.637-639
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• 2001

PDA를 이용한 무선통신 단말의 구성은 이동성, 편리성이 강조되어야 하며, 언제 어디서나 사용자가 원하는 정보를 받아 볼 수 있어야 한다. 이러한 필요성에 의해 정보를 자동으로 다운로드(download)한다면 사용자의 편리성은 더욱 증대될 것이다. 따라서 PDA용 소프트웨어를 개발할 때 필요한 구성요소로서 무선 에이전트(wireless agent)개념을 추가하여 소프트웨어 계층을 구성하면 별도의 소프트웨어 개발단계 없이 무선 에이전트가 추가된 소프트웨어를 쉽게 구성할 수 있다. 본 논문에서는 PDA를 위한 소프트웨어의 에이전트개념을 도입하고 무선이동단말기의 이용효율과 편리성을 극대화하고자 무선 에이전트 클래스를 설계하고 구현하였다.

• Proceedings of the KAIS Fall Conference
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• 2003.06a
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• pp.219-221
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• 2003

This system is Emergency patient medical examination and treatment way through biosignal transmission to use PDA. Store measured biosignal that is stored to file to database by Application, This system helps doctor's treatment that transmit patient's biosignal data and patient's symptoms use wireless internet. ThenOffer more than safer medical treatment environment to a doctor and patient

• Proceedings of the KSME Conference
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• 2005.11a
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• pp.196.1-196.1
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• 2005

• Proceedings of the Korea Society of Design Studies Conference
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• 2004.05a
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• pp.326-327
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• 2004