• The Transactions of the Korea Information Processing Society
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• 제7권12호
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• pp.3785-3793
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• 2000

Effective synchronization specification model which can specify temrxlral relationship among media resolving asynchronous problem due to variable network delay is necessary in a distributed multimedia system. Therefore in this paper, we propose RTPN(Real- Time Petri Net) synchronization specification model based on Petri Net for multimedia application in a distributed real time environment. The proposed RTPN model supplies a tlexible decsription of the temporal relationship among various media objects by defining primary key media and relative key media according to delay and importance among media. Firing rule is instantly executed by firing function based on QoS values which supports intra-media and inter-media syncbronization. And asynchronous control algorithm for resynchronization of presentation level is possible more effective supporting of QoS.

• Proceedings of the IEEK Conference
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• 대한전자공학회 2000년도 하계종합학술대회 논문집(1)
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• pp.85-88
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• 2000

Distributed Control System(DCS) is one of the best solutions to implement control systems because it provides continuous observation of control process and execution of commands to induce proper operations. In this paper, a design of control network for DCS in nuclear power plant is proposed. The proposed control network on DCS has a simple architecture and deterministic property. Thus, the proposed control network offers hard real-time periodic service. It also has redundant media for the fault-tolerance. As a result, high safety and reliability required in nuclear power plant are guaranteed.

• Journal of dental hygiene science
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• 제2권1호
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• pp.31-38
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• 2002

This study was to investigate the antibacterial effect of 63 species herbal medicine extracts on S. mutans growth by paper disc method and then examined the effects of S. mutans growth by some selected herbal medicines. Antibacterial effect of 63 species medicinal herb extracts on S. mutans was superior to Lycopi herba, Scutellariae radix in regular order and antibacterial activity(20 mg/ml concentration) through paper disc method were measured 6.3 mm and 3.5 mm, respectively. The growth of S. mutans in control medium was the highest at 8hrs, while that of medicinal herbs extract added-medium(2 mg/ml) was at 16 hrs. The pH values of the control media and media supplemented with Lycopi herba and Scutellariae radix extract were 5.08, 5.80, and 5.74 at 8 hrs, respectively. In the change of total carbohydrate of the control media and supplemented with Lycopi herba and Scutellariae radix extract were 0.81 mg/ml, 1.70 mg/ml and 1.84 mg/ml at 8 hrs, respectively. In the change of proteins of the control media and supplemented with Lycopi herba and Scutellariae radix extract were 8.39 mg/ml, 9.52 mg/ml and 9.28 mg/ml at 8 hrs, respectively. The polysaccharide contents of the control media and supplemented with Lycopi herba and Scutellariae radix extract were 300 mg/100 ml, 200 mg/100 ml and 220 mg/100 ml at 8hrs, respectively.

• Journal of dental hygiene science
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• 제3권1호
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• pp.39-44
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• 2003

This study was to investigate the antibacterial effect of Schizandrae fructus and Evodiae fructus extracts on S. mutans growth. The antibacterial effect of these extracts on S. mutans was good at Schizandrae fructus extract than the Evodiae fructus extract. The antibacterial activities of these extracts were measured 8.5 mm and 6.5 mm at 20 mg/ml concentration, respectively. The growth of S. mutans in control medium was the highest at 8 hrs, while the media of Schizandrae fructus and Evodiae fructus extracts added-medium(2 mg/ml) showed maximum growth at 16hrs. The pH values of the control medium was 5.08 at 8 hrs, but the media supplemented with Schizandrae fructus and Evodiae fructus extracts were 6.00, and 5.36 at 8 hrs, respectively. The amounts of total carbohydrate for the control media was 0.81 mg/ml at 8 hrs, but the media supplemented with Schizandrae and Evodiae fructus extracts were 1.32 mg/ml and 1.88 mg/ml at 8 hrs, respectively. In the change of culture medium proteins, the control culture broth and cultures supplemented with Schizandrae fructus and Evodiae fructus extracts were 8.39 mg/ml, 8.59 mg/ml and 9.97 mg/ml at 8 hrs, respectively. The S. mutans polysaccharide contents of the control medium and the media supplemented with Schizandrae and Evodiae fructus extracts were 300 mg/100 ml, 240 mg/100 ml and 280 mg/100 ml at 8 hrs, respectively.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• 제12권5호
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• pp.267-273
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• 2012

The short-range communication module was developed in this paper which is suitable for the point-to-multipoint circumstances of 40 terminals communicating frequently in about 50 meters. The media access control layer of this communication module using asynchronous time-division multiplexing provides a fast and robust performance even in the worst case of simultaneous transmission events, and low packet error rate was measured a in LOS (Line-of-sight) circumstance by adding the function of acknowledge response to media access control layer. The difference test was carried out in order to measure the performance of point-to-multipoint communication. Two communication modules are respectively measured and graphed in 10 branches to 40 branches. The communication module developed in this paper showed a faster performance than the commercial Zigbee module in the specific case presented in this paper. Especially, in over 20 branches showed wide differences of the transmission speed. This results is caused by more network overhead of Zigbee whose wider applications needs the network layer and applicaiton layer besides media access control layer. Also, the asynchronous time-division multiplexing proposed in this paper are more suitable than CSMA-CA of Zigbee module when a lot of module ought to be frequently communicated in small area.

• International Journal of Advanced Culture Technology
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• 제4권4호
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• pp.81-86
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• 2016

In this paper, we propose a simple and effective vision-based tracking controller design for autonomous object tracking using multicopter. The multicopter based automatic tracking system usually unstable when the object moved so the tracking process can't define the object position location exactly that means when the object moves, the system can't track object suddenly along to the direction of objects movement. The system will always looking for the object from the first point or its home position. In this paper, PID control used to improve the stability of tracking system, so that the result object tracking became more stable than before, it can be seen from error of tracking. A computer vision and control strategy is applied to detect a diverse set of moving objects on Raspberry Pi based platform and Software defined PID controller design to control Yaw, Throttle, Pitch of the multicopter in real time. Finally based series of experiment results and concluded that the PID control make the tracking system become more stable in real time.

• Journal of Advanced Navigation Technology
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• 제14권2호
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• pp.253-259
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• 2010

Wireless mesh network is flexible network like Ad hoc network or bluetooth together based on base station. But, wireless mesh network shows high packet loss and when TCP was created, however as it was design based on wired link, wireless link made more transmission error than wired link. It is existent problem of TCP congestion control algorithm that TCP unfairness and congestion collapse over wireless mesh network. When TCP operation occurs with the packet loss where is not the congestion loss, it brings the performance degradation which is serious. In this paper, in order to improve efficient TCP congestion control algorithm in wireless mesh network, we proposed that TCP can adaptively regulate the congestion window in wireless link.

• Smart Media Journal
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• 제13권3호
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• pp.45-52
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• 2024

In today's growing threat environment, rapid and effective detection and response to security events is essential. To solve these problems, many companies and organizations respond to security threats by introducing security control systems. However, existing security control systems are experiencing difficulties due to the complexity and diverse characteristics of security events. In this study, we propose an automated integrated security control system model based on artificial intelligence. It is based on deep learning, an artificial intelligence technology, and provides effective detection and processing functions for various security events. To this end, the model applies various artificial intelligence algorithms and machine learning methods to overcome the limitations of existing security control systems. The proposed model reduces the operator's workload, ensures efficient operation, and supports rapid response to security threats.

• Journal of Bio-Environment Control
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• 제19권4호
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• pp.240-245
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• 2010

The objective of this study was to determine the effect of different height of drainpipe and growing media soilless cultivated cut rose in container culture. Two experiment were to examine the effect of the drainpipe height and media composition on yield and quality of cut rose, Four different drainpipe height (0, 3, 6, 9 cm) were treated to determine of optimal container type. Yield was the highest at 3 cm drainpipe height, but quality was not significantly affected by drainpipe height. Survival rate of rose was 100%, 100%, 92%, and 92%, respectively. Two different drainpipe height (0, 3 cm) and 7 media composition (pure coir and pelite, and mixed with two media 3 : 1, 2 : 1, 1 : 1, 1 : 2, 1 : 3 v/v) was treated to determine of media composition related to drainpipe height. The supply of nutrient solution was controlled by the signal of water potential at -5 kPa using frequency domain reflectometry (FDR) sensor in mixed coir with pelite 3 : 1, 1 : 1, 1 : 3 (v/v), respectively. Irrigation frequency reduced in high ratio of coir media and 3 cm height of drainpipe. Quality of cut rose except for flower weight and yield until 2nd harvest was not significantly affected by drainpipe height, but yield after 3rd was higher at 3 cm than 0 cm height of darinpipe. In the media composition, yield and qulity of cut rose was increased at high ratio of coir media.

• Journal of Bio-Environment Control
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• 제14권3호
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• pp.182-189
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• 2005

This research was conducted to determine physical properties of four root media, peatmoss + vermiculite (1:1, v/v; PV), peatmoss + composted rice hall (1:1, PR), peatmoss + composted saw-dust (1:1 : PS) and peatmoss + composted pine bark (1:1 PB), as influenced by incorporation rate of Stock-sorb C (STSB). Each root medium containing STSB was packed in 22 cm diameter plastic pot and the physical properties were determined at 5 weeks after packing. As incorporation rate of STSB were elevated, total porosity increased in PV, PS and PB media with statistical differences at $5{\%}$ level. Those also resulted in increase of container capacity in PS and PB media, but statistical differences were not observed in PV and PR media. Elevated incorporation rate of STSB in PV, PS and PB media resulted in increase of air space with statistical differences. Trends in air space of the three root media showed a linear as well as quadratic responses to STSB contents of media. As incorporation rate of STSB increased, more water was retained in four root media at the soil moisture tension of 4.90 kPa, 9.81 kPa, 29.4 kPa and 1.5 MPa. The amount of water retained in PS medium was the highest at the moisture tension at 29.4 kPa and 1.5 MPa followed by PB, PR and PV medium. These results indicated that elevation of incorporation rate of STSB to various root media increased moisture retention capacity, but did not increase the available water holding capacity.