• Journal of IKEEE
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• v.19 no.4
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• pp.520-525
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• 2015

This paper investigates the consensus problem for high-order integrators with an arbitrary large communication delay. In order to solve this problem, new consensus controller with an additional design parameter that can eliminate the effect of a communication delay on the consensus problem is proposed. Also, it is proved that the proposed consensus controller can always solve the consensus problem of high-order integrators even in the presence of an arbitrarily large communication delay. Finally, an illustrative example is given in order to show the effectiveness of our design method.

• Journal of Environmental Science International
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• v.22 no.4
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• pp.397-406
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• 2013

With the methodology of AHP, this paper focuses on communication activities and their constituents in city parks, selecting 11 constituents, natural or artificial, and establishes an evaluation model on the basis of the analysis of the characteristics of tourists' communication activities in order to obtain the weight and order of importance of the constituents of communication activities space. First-grade indicators influence weight and the order of the constituents of communication activities space are: artificial constituents (0.6614) > natural constituents (0.3386). The weight and order of five secondary indicators attached to natural constituents: private space (0.1538) > shade tree (0.0955) > gentle slope mound (0.0474) > beautiful waterscape (0.0270) > sunshine lawn (0.0149); the weight and order of six secondary indicators attached to artificial constituents: field boundary (0.2865) > Leisure chairs (0.1843) > resting areas (0.0795) > appropriate square (0.0533) > tree-lined road (0.0352) > landscape sketch (0.0227).Using modern decision analysis methodology to research the relationship of environment constituent elements has great theoretical and practical significance for the scientific design and construction of suitable environment for human needs.

• Journal of the Korea Institute of Military Science and Technology
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• v.16 no.5
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• pp.666-674
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• 2013

This paper studied about the design and implementation of tactical communication network simulator in order to obtain tactical communication network parameter, such as link capacity and routing plan, and a number of exceptional cases that may occur during actual deployment by conducting simulation of a large-scale tactical communication networks. This tactical communication network simulator provides equipment models and link models of commercial OPNET simulator for tactical communication network. In addition, 6 types of simulation scenario writings convenience functions and traffic generation models that may occur in situations of tactical communication network environment were implemented in order to enhance user friendliness. By taking advantages of SITL(System-In-The-Loop) function of OPNET, the tactical communication network simulator allows users to perform interoperability test between M&S models and actual equipment in operating simulation of tactical communication network, which is run on software. In order to confirm the functions and performance of the simulator, small-scale of tactical communication network was configured to make sure interoperability between SITL-based equipment and a large-scale tactical communication network was simulated and checked how to cope with traffic generated for each network node. As the results, we were able to confirm that the simulator is operated properly.

• The Journal of the Acoustical Society of Korea
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• v.40 no.5
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• pp.428-438
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• 2021

For long-range communication in deep water, low carrier frequency is efficient due to a decrease in transmission loss. However, there is a limitation in that the data rate decreases due to a narrow bandwith. In order to increase the data rate in an environment with a limited bandwidth, it is necessary to design a higher-order modulation scheme. This paper analyzes the long-range communication data modulated by higher-order modulation schemes. The long-range communication experiment (23 km ~) was conducted in East Sea in October 2020. During the experiment, a vertical line array was utilized and communication sequences were modulated by Phase Shift Keying (PSK) and Quadrature Amplitude Modulation (QAM) schemes and transmitted by a towed source. In more detail, PSK modulation consists of quadrature PSK and 8PSK, QAM modulation consists of 8QAM and 16QAM. Time reversal processing is applied to mitigate inter-symbol interference by utilizing the correlation between received signals and channel impulse responses. All modulation schemes show successful results at 23 km range, demonstrating the feasibility of higher-order modulation in long-range communication.

• Journal of Korea Society of Industrial Information Systems
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• v.13 no.5
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• pp.98-105
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• 2008

Zigbee communication is applied in the many communication system. This paper is the system development contents which applies a zigbee communication. The system which develops from this paper is apply a zigbee communication in order system Does so, Reduced the step of orders from employee or from counter. Because of that, reduced the order number of times which goes wrong and shortened a time. Reasoning is caused by prevented an order delay at busy time. Order and payment are together controlled from inside the program which is developed. The adjust of the present state of sale does not have a necessity. Because that is stored at Database.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.1
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• pp.572-578
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• 2017

Haptic systems help users feel a realistic sensation when they manipulate virtual objects in the remote virtual environment. However, there are communication time delays that may make the haptic system unstable. This paper shows the relationship between communication time delay, properties of a haptic device, and the stability of the haptic system with the first-order hold method in a simulation. The maximum available stiffness of a virtual spring with the first-order hold method is larger than in the zero-order hold method when there is no time delay. However, when the communication time delay is much larger than the sampling time, the maximum available stiffness to guarantee the stability becomes the same, irrespective of the sample-hold methods. Besides, the maximum available stiffness increases in inverse proportion to the communication time delay and in proportional to the damping coefficient of the haptic device.

• Journal of Families and Better Life
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• v.21 no.6
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• pp.141-155
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• 2003

The purpose of this study was to investigate the relationship between communication patterns and marital satisfaction of elderly men and women. The participants of this study were 206 elderly (60 years and older), and they were all recruited in Seoul. The major findings of this study are as follows: First, the communication patterns of elderly men and women were affected significantly by background variables, self-esteem, and personality style. Second, marital satisfaction was affected significantly by background variables, self-esteem, and personality style. Self-esteem was the major factor that had significant impact on the marital satisfaction for all respondents. Third, there was a gender difference in the impact of background variables, self-esteem, and communication pattern on marital satisfaction. For elderly men, the factors affecting marital satisfaction were, in decreasing order, constructive communication, destructive communication, self-esteem, and economic condition, whereas for elderly women, the factors were, in decreasing order, constructive communication, self-esteem and destructive communication.

• Korean Institute of Interior Design Journal
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• no.20
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• pp.56-61
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• 1999

The purpose this study was to examine the actual condition and trends in changing the seating style in the house, focusing on the behavioral posture. The data was collected through the self-entry questionnaire designed for this study and the sample of 400 in total, 200 cases from Korea and 200 cases from Japav. The major findings were as the following : the seating style of Korean and japanese female university students were the floor-seating trends in the present conditiov. But they generally preferred the chair seating in the future. In the present seating style, the chair seating style has included bath, study, dinner, sleep, make-up, rest and family communication in that order by Korean Female university students ; the chair seating style has included sleep, study, dinner, make-up, bath, rest and family communication in that order by japanese. In the future seating style, the chair seating style has included study, make-up, dinner, sleep, bath, family communication and rest in that order by Korean ; the chair seating style sleep, study·make-up, dinner, family communication, rest and bath in that order by Japanese.

• Journal of IKEEE
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• v.20 no.4
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• pp.378-384
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• 2016

This paper addresses the output feedback consensus problem for high-order integrators under a directed network with a communication delay. In order to solve this problem, the dynamic output feedback controller is proposed. Also, by using Lyapunov-Krasovskii functional, it is shown that the existence of the proposed consensus controller can always be guaranteed even in the presence of an arbitrarily large communication delay.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.1
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• pp.81-86
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• 2016

Three hundred years ago, the fractional differential equation that is one of concept of fractional calculus released. Now, many researchers continue to try best effort applying into the control engineering, mathematics and physics. In this paper, the dynamics equation which is represented by Van der Pol, represent integer order and fractional order that having real order. Then this paper performs the comparisons between integer and real order as time series and phase portrait according to variation of parameter value for real order.