• Journal of Mushroom
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• v.16 no.2
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• pp.125-129
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• 2018

In order to develop a smart cultivation facility based on ICT (Information Communication Technology), a cultivation house was selected. Sensor devices were installed to monitor any changes in the cultivation environment. A control panel was constructed to monitor and control the data on environmental changes collected by the sensors. To efficiently manage the proceedings of the cultivation environment, the cultivation process was divided into 4 stages. We designed an environmental control module using these processes. PC and mobile phone software were designed for remote monitoring and control to develop a smart cultivation system that can conveniently manage the cultivation environment and produce mushrooms in a more stable manner.

• Journal of Internet Computing and Services
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• v.1 no.2
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• pp.19-28
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• 2000

The scheduling problem in parallel processing systems has been a challenging research issue for decades. The problem is defined as finding an optimal schedule which minimizes the parallel execution time of an application on a target multiprocessor system. Duplication Based Scheduling (DBS) is a relatively new approach for solving the problem. The DBS algorithms are capable of reducing communication overhead by duplicating remote parent tasks on local processors. Most of DBS algorithms assume an availability of the unlimited number of processors in the system. Since the assumption may net hold in practice, the paper proposes a new scalable DBS algorithm for a target system with limited number of processors. It Is shown that the proposed algorithm with N available processors generates the same schedule as that obtained by the algorithm with unlimited number of processors, where N is the number of input tasks. Also, the performance evaluation reveals that the proposed algorithm shows a graceful performance degradation as the number of available processors in the system is decreased.

• Journal of Internet Computing and Services
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• v.8 no.5
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• pp.11-20
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• 2007

This paper designs and implements a message passing library called JMPI (Java Message Passing Interface) which complies with MPJ (Message Passing in Java), the MPI standard Specification for Java language, This library provides some graphic user interface tools to enable parallel computing environments to be configured very simply by their administrators and JMPI applications to be executed very conveniently. Also in this paper, we implement two versions of systems using Socket and RPC which are both typical distributed system communication mechanisms and with three benchmark applications, compare performance of these systems with that of an existing system JPVM depending on the increasing number of the computers. Experimental results show that our systems outperform JPVM system in terms of various aspects and that the most efficient processing speedup can be obtained by increasing the number of the computers in consideration of network traffic through processing evaluation. Finally, we can see that, as the number of computers increases, using RMI to transmit a message is more effective than using object streams attached to sockets to transmit a message.

• Journal of Korean Society of Transportation
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• v.17 no.2
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• pp.7-19
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• 1999

The Purpose of this study is to analyze the impact of telecommuting-the use of telecommunications technology to perform work from remote sites- on the transportation system. It examined the effects of telecommuting on commuter travel. After reviewing case studies of foreign countries and their telecommuting characteristic, two types of survey, RP(Revealed Preference) and SP (Stated Preference), were carried out in order to analyze the impact of telecommuting on traffic. The RP survey examined respondents'attitudes toward information technology and the characteristics of their work. The SP survey asked respondents what conditions would make them want to become a telecommuter. It was found that higher salaries and communication subsidies would induce more people to telecommute. Overall, it was found that if telecommuting were to be executed in Seoul, 49.1% of workers would become telecommuters, which would result in a 14,407 billion won reduction in direct and indirect transport costs per year. This research proves that traffic congestion can be reduced effectively by instituting telecommuting as an option for workers.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1305-1312
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• 2006

This study is about the development of measurement system using ubiquitous wireless communication for river flow monitoring. The system can acquire water depth, quality (temperature, pH, conductivity, turbidity etc.) while a GPS module for getting the location data of measurement points. Also this system is able to acquire the field data via RF connection and can be controlled same time. The acquired data is transmitted to a gateway system from the remote buoy using Zigbee wireless connection. And the gateway system is able to monitor the data through GIS monitoring tool. Finally the data are transmitted to a server computer using CDMA wireless connection by gateway system. The D/B of server computer are constructed automatically and monitored the project web site. The resulting system can be used for scour monitoring, environment monitoring and the other monitoring purposes such as a river flow monitoring system.

• Proceedings of the KSRS Conference
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• 2005.10a
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• pp.493-496
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• 2005

The PMU (Payload Management Unit) in MSC (Multi-Spectral Camera) is the main subsystem for the management, control and power supply of the MSC payload operation. The PMU shall handle the communication with the BUS (Spacecraft) OBC (On Board Computer) for the command, the telemetry and the communications with the various MSC units. The PMU will perform that distributes power to the various MSC units, collects the telemetry reports from MSC units, performs thermal control of the EOS (Electro-Optical Subsystem), performs the NUC (Non-Uniformity Correction) function of the raw imagery data, and rearranges the pixel data and output it to the DCSU (Data Compression and Storage Unit). The BUS provides high voltage to the MSC. The PMU is connected to primary and redundant BUS power and distributes the high unregulated primary voltages for all MSC sub-units. The PSM (Power Supply Module) is an assembly in the PMU implements the interface between several channels on the input. The bus switches are used to prevent a single point system failure. Such a failure could need the PSS (Power Supply System) requirement to combine the two PSM boards' bus outputs in a wired-OR configuration. In such a configuration if one of the boards' output gets shorted to ground then the entire bus could fail thereby causing the entire MSC to fail. To prevent such a short from pulling down the system, the switch could be opened and disconnect the short from the bus. This switch operation is controlled by the BUS.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.238-243
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• 2006

최근에는 통신기술과 인터넷의 발달로 원격의 사람과 전화, 이메일, 메신저 또는 화상회의 시스템 등을 통해서 쉽게 의사소통 할 수 있다. 이 시스템들은 주로 음성, 그림, 동영상 또는 문자 기반의 시청각 정보를 서로 주고 받으며 자신의 의사 및 감정을 전달하는 통로를 제공한다. 그러나 일상 생활에서 시청각 정보 외에 촉감 정보도 서로 의사소통 하는데 중요한 역할을 한다. 악수, 포옹 등의 촉감 상호작용은 사람 사이에서 친근감을 표시하는데 가장 직접적인 방법으로 자신의 감정을 전달하거나 느낌을 표현하는데 사용된다. 그럼에도 불구하고 촉감 상호작용을 가능케 하는 의사소통 시스템의 연구는 아직 폭넓게 진행되고 있지 않다. 본 논문에서는 일상에서와 같이 원격에서도 상대를 바라 볼 수 있고 자연스럽게 접촉할 수 있는 원격 촉감 커뮤니케이션 시스템을 제안한다. 이 시스템에서는 로컬 사용자가 손가락으로 상대의 몸 특정 부위를 만질 수 있고 서로 그 촉감을 실시간으로 느낄 수 있다. 이 시스템은 크게 AR 시스템, 그래픽 시스템, 햅틱 시스템, 택타일 시스템의 부시스템들로 나눌 수 있다. AR 시스템에서는 몸의 한 부위에 사각형의 AR 마커를 부착한 원격 사용자를 웹카메라로 촬영하고 ARToolKit 을 사용하여 마커의 위치를 측정한다. AR 마커의 바로 밑에는 택타일 장치가 장착되어 있으며 이 부위를 통하여 원격의 사용자는 로컬사용자가 자신의 팔을 만지는 느낌을 받게된다. 그래픽 시스템은 로컬사용자에게 촬영된 원격 사용자와 측정된 마커의 위치가 대표하는 원격 사용자의 가상 피부, 그리고 자신의 가상 손가락을 보여준다. 햅틱 시스템에서는 촉감 장치를 사용하여 로컬 사용자의 손가락 위치를 구하여 원격 사용자의 가상 피부와 접촉했을 때 그 충돌을 감지하고 접촉력을 계산하여 촉감 장치에 반영함으로써 그 접촉력을 느낄 수 있도록 한다. 택타일 시스템에서는 원격 사용자의 AR 마커 밑에 장착된 배열 타입의 진동 촉감 장치에 접촉 정보를 주어 로컬 사용자와 접촉 했을 때 접촉 부위에 진동을 줌으로써 촉감을 느끼도록 한다.

• The Transactions of the Korea Information Processing Society
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• v.3 no.7
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• pp.1719-1726
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• 1996

In the OR-parallel execution of logic programs, binding environments have a critical impact on the performance. Particularly, this is true for distributed execution on parallel systems with a non-single address space. The reason is that in such systems, the remote accesses across processing elements deteriorate the performance. To solve this problem, some binding methods were previously proposed specifically for a non-single address space. However, compared with the binding methods for a single address space, they are far less efficient due to the overhead of newly introduced operations such as environment closing and back-unification, In this paper, we propose a new binding environment is a hybrid that combines both the binding methods for a single address space and those for anon-single address space. It acomplishes high efficiency by making closing operations unnecessary both at unification and at back-unification, while mainthing the restricted accesses.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.28 no.9
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• pp.99-104
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• 2014

This paper presents a unified live-streaming method based on Hypertext Mark-up Language 5(HTML5) for an IP camera which is independent of browsers of clients and is implemented with open-source libraries. Currently, conventional security systems based on analog CCTV cameras are being modified to newer surveillance systems utilizing IP cameras. These cameras offer remote surveillance and monitoring regardless of the device being used at any time, from any location. However, this approach needs live-streaming protocols to be implemented in order to verify real-time video streams and surveillance is possible after installation of separate plug-ins or special software. Recently, live streaming is being conducted through HTML5 using two different standard protocols: HLS and DASH, that works with Apple and Android products respectively. This paper proposes a live-streaming approach that is linked on either of the two protocols which makes the system independent with the browser or OS. The client is possible to monitor real-time video streams without the need of any additional plug-ins. Moreover, by implementing open source libraries, development costs and time were economized. We verified usefulness of the proposed approach through mobile devices and extendability to other various applications of the system.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.2
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• pp.58-68
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• 2010

This paper proposes a novel design of auto light control system with high efficiency using RS-485 to save lighting energy in new and existing buildings. The proposed system consists of ALSU(Auto Light Sensor Unit) which is connected with RS-485 to control lighting appliances, ALS(Auto Light Unit), and Hi-FACS which is a monitoring system using communication interface. lighting appliances are automatically controlled by ALSU which detects moving objects. The total system is designed to be controlled by either manual or auto mode by using the ALS. In addition, the monitoring system receives the information on the state of the lighting appliances from ALSU and ALS to control the proposed system We compared the proposed system with the conventional one in functionality and energy saving point of view. Through some experimental results, the proposed system shows better performance in various circumstances.