• Journal of the Korean Institute of Telematics and Electronics B
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• v.29B no.5
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• pp.21-29
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• 1992

This paper proposes a new MAC propocol for high-speed MAN. The proposed protocol is based on the P$_1$-persistent tranmission scheme and each node calculates the transmission probability periodically by using delay information(DI). A window mechanism for the calculation of message delay in each node is proposed to improve the adaptability of the proposed protocol to traffic changes. The capactiy of the proposed protocol is analyzed. The simulation results show that the proposed protocol gives fair message delay under heavy load conditions and, when the transmission speed or distance is increased, the message delay variation of the proposed protocol is less than that of IEEE 802.6 DQDB.

• IEMEK Journal of Embedded Systems and Applications
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• v.7 no.1
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• pp.53-59
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• 2012

Recently, LEE et al. proposed an attribute-based authenticated key agreement protocol over home network, which aimed to support authentication and key agreement between user and home server. However, if the home server is attacked in the protocol, the effects are influenced to the overall home network components severly. Thereby, this paper proposes a new ticket-based authentication protocol using user attributes between user and home devices to solve the problem. The proposed protocol supports the various levels of security to user by diversifying the network accessibility depending on user attribute. Thereby, the protocol could support more secure home network services.

• Journal of Industrial Technology
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• v.34
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• pp.27-32
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• 2014

Infrared remote controllers are widely used in controlling electronic devices due to its simplicity and convenience. This paper presents a smart phone application unifying any infrared remote controllers. We can select a device from device list menu of the application. Any new device can be added easily by downloading the protocol file of the device from protocol file server. Remote controller protocol files are stored in audio file format, and the file related to a specific menu button is transmitted through the audio jack of smart phones. The protocol file server is a standard file server, and protocol files for various devices are collected by infrared receiver module. For smart phones without infrared facility, a small infrared module translating audio signal to infrared signal is applied.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.15 no.5
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• pp.434-445
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• 1990

Protocol testing techniques are expanded from the traditional simple function- testing based on the OSI model, to sophisticated performance testing, conformance testing and interoperability testing. In addition, both point-to-point and point-to-multipoint protocols are to be covered. This paper presents a new multiple-purpose protocol test system where the common platform includes the test sequence generation and test result analysis, and the modular test execution part is selectively adjusted according to the test purposes and protocols under test. This paper describes test system for network routing protocol and test system for transport protocol, designed upon the ideas of the multiple-purpose protocol test system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.19 no.9
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• pp.1648-1657
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• 1994

This paper is concerned with the development of a packet communication protocol KAX. 25 to be used on the KITSAT microsatellite. As a part of the KAX, 25 protocol, an interrupt driven I/O driver, I/O handler and an AX. 25 radio communication protocol are implemented in the KASCOM that will be used as On-Board Computer in the next missions. The implemented protocol is applied to the enginnering model of the KITSAT-2 satellite in the test configuration simulating the link between the satellite and the ground station and the compatibility of the data link layer protocol is tested.

• Journal of Communications and Networks
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• v.13 no.3
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• pp.257-265
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• 2011

In this paper, a cooperative relaying protocol called soft-decision-and-forward (SDF) with multiple antennas in each node is introduced. SDF protocol exploits the soft decision source symbol values from the received signal at the relay node. For orthogonal transmission (OT), orthogonal codes including Alamouti code are used and for non-orthogonal transmission (NT), distributed space-time codes are designed by using a quasi-orthogonal space-time block code. The optimal maximum likelihood (ML) decoders for the proposed protocol with low decoding complexity are proposed. For OT, the ML decoders are derived as symbolwise decoders while for NT, the ML decoders are derived as pairwise decoders. It can be seen through simulations that SDF protocol outperforms AF protocol for both OT and NT.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.54 no.11
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• pp.660-668
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• 2005

Digital communication networks have become a core technology in advanced building automation systems. BACnet (Building Automation and Control networks) is a standard data communication protocol designed specifically for building automation and control systems. BACnet adopts Master-Slave/Token-Passing (MS/TP) protocol as one of its field level networks. Tn this study, we introduce a method of implementing bandwidth allocation scheme in the MS/TP protocol. The bandwidth allocation scheme improves the capability of real-time communication of the original MS/TP protocol. The bandwidth allocation scheme introduced in this paper can be easily implemented in the existing MS/TP protocol with a slight modification. In this study, we examined the validity of bandwidth allocation scheme using simulation models. The results from the simulation experiment show that the proposed scheme satisfies the requirements of real-time communication.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.8 no.4
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• pp.1223-1236
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• 2014

With the extension of wireless technology, vehicular ad hoc networks provide important services for the dissemination of general data and emergency warnings. However, since, the vehicle topology frequently changes from a dense to a sparse network depending on the speed of the moving vehicles and the time of day, vehicular ad hoc networks require a protocol that can facilitate the efficient and reliable dissemination of emergency messages in a highly mobile environment under dense or intermittent vehicular connectivity. Therefore, this paper proposes a new vehicular broadcast protocol, called BL-CAST, that can operate effectively in both dense and sparse network scenarios. As a low overhead multi-hop broadcast protocol, BL-CAST does not rely on the periodic exchange of beacons for updating location information. Instead, the location information of a vehicle is included in a broadcast message to identify the last rebroadcasting vehicle in an intermittently connected network. Simulation results show that BL-CAST outperforms the DV-CAST protocol in terms of the end-to-end delay, message delivery ratio and network overhead.

• Fire Science and Engineering
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• v.24 no.2
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• pp.185-193
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• 2010

This study aimed to develop a prehospital protocol on CPR to patients with nontraumatic cardiac arrest for emergency medical technicians. For the purpose, we prepared a protocol based on preliminary items and demonstrated its validity to confirm a final protocol from March 1, 2007- August 30. 2008. The practical CPR protocol on cardiac arrest victims can be used as means to support quick and exact decision-making on CPR, which will contribute to enhancement of emergency medical services.

• The Korean Journal of Rehabilitation Nursing
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• v.19 no.2
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• pp.118-127
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• 2016

Purpose: This study was to develop an evidence-based clinical practice protocol of physical restraints by adaptation process for patients with a geriatric hospital. Methods: Protocol adaptation process was conducted in accordance with manual for guideline adaptation version 1.0 by ADAPTE collaboration. Results: The adapted physical restraint protocol was consisted of 3 domains and 37 recommendations. The number of recommendations in each domain were: 7 nursing assessment, 19 nursing intervention, and 11 nursing evaluation. More than half (56.8%) of the recommendations were rated as grade B, 37.8% as grade C, and 5.4% were rated as grade D. Conclusion: The adapted physical restraint protocol is expected to contribute as an evidence-based clinical practice protocol for healthcare workers in geriatric hospitals for reducing and improving efficiency of appropriate physical restraints use.