• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.10
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• pp.49-57
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• 2010

In order to provide electricity to users economically and safely, distribution automation systems (DASs) monitor and operate components of distribution systems remotely through communication networks. The fiber optic communication network has been mainly installed for the DAS of Korea Electric Power Corporation (KEPCO) because of its huge bandwidth and dielectric noise immunity. However, the fiber optic communication network has some shortcomings that its installation cost and communication fee are expensive. This paper proposes a complex network where WLANs are combined with conventional fiber optic communication networks in order to expand DAS easily and inexpensively. A fixed wireless bridge communication unit (FWB-CU) for the proposed complex network is implemented using IEEE 802.11a WLAN technology. The proposed complex network is built actually to verify its feasibility experimentally as a DAS communication network.

• Journal of the Korean housing association
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• v.26 no.3
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• pp.25-32
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• 2015

Apartment complex has become the major residental type of the urban structure. apartment complex has started to equip various subsidiary welfare facilities recently. environmental planning for play space has especially been important due to the growing attention over children's emotional development. In this study, arrangement types for play spaces in apartments to invigorate communication had been analyzed focusing on physical environment. based on previous studies, the arrangement of subsidiary welfare facilities can be categorized into dispersal type, concentrative type, affiliated type, and affiliated concentration type, and the elements to invigorate communication consist of circulative elements which contain location of play space and affiliated facility, visual elements which contain visual openness, and social elements which draw arrangement types of benches. the result of the analysis devide the arrangement type into concentrative type, affiliated type, and affiliated concentration type. referring to the location of play space, the first, if it is situated outside of apartment complex, theme-centered play space can be equipped to invigorate communication, the second, if it is situated in the center of the complex or outside of the apartment complex, low fence can be applied for free sight, and the last, straight type of bench arrangement should be used in big scale play space, aspectant type and gazebo type of the arrangement can be situated only outside of complex. This research could serve as a baseline of physical environment analysis to invigorate communication for play space in apartment complex.

• Journal of information and communication convergence engineering
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• v.14 no.2
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• pp.78-83
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• 2016

In underwater acoustic communication, the transmitted signals are severely influenced by the reflections from both the sea surface and the sea bottom. As very large reflection signals from these boundaries cause an inter-symbol interference (ISI) effect, the communication quality worsens. A channel estimation-based equalizer is usually adopted to compensate for the reflected signals under the acoustic communication channel. In this study, a feed-forward equalizer (FFE) with the least mean squares (LMS) algorithm was applied to a quadrature phase-shift keying (QPSK) transmission system. Two different types of equalizers were adopted in the QPSK system, namely a real-coefficient equalizer and a complex-coefficient equalizer. The performance of the complex-coefficient equalizer was better than that of two real-coefficient equalizers. Therefore, a Hilbert transform was applied to the real-coefficient binary phase-shift keying (BPSK) system to obtain a complex-coefficient BPSK system. Consequently, we obtained better results than those of a real-coefficient equalizer.

• Journal of information and communication convergence engineering
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• v.2 no.4
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• pp.237-242
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• 2004

In this paper, we introduce a complex systems synchronization method using hyper-chaos circuit consist of State-Controlled Cellular Neural Network (SC-CNN). We make a complex systems using SC-CNN with the n-double scroll. A complex system is created by applying identical n-double scroll or non-identical n-double scroll and Chua's oscillator with weak coupled method to each cell. Complex systems synchronization were achieved using GS(Generalized Synchronization) method between the transmitter and receiver about each state variable in the SC-CNN.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.2
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• pp.289-293
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• 2005

this paper, we introduce a secure communication method using complex system. We make a complex system with the n-double scroll or Chua's oscillator. The Complex system is created by applying identical n0double scroll or non-identical n-double scroll and Chua's oscillator with weak soupled method to each cell. In order to secure communication, we have synthesizing the desired information with a complex system circuit by adding the information signal to the hyper-chaos signal. And then, transmitting the synthesized signal to the ideal channel, we confirm secure communication by separating the information signal and the complex system signal in the receiver.

• Korean Journal of Human Ecology
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• v.23 no.2
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• pp.329-341
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• 2014

This study examined the effects of cultural communication on the fashion distribution type and the shopping benefit in fashion cultural complex space. Surveys period was from Sep. 17th to Sep. 21st in 2012. The Subjects of this study were the young 207 people who had shopping experiences in fashion cultural complex space in their 20s~30s. The data were analyzed by a reliability analysis(Cronbach's ${\alpha}$), factor analysis and regression analysis. The main results of this study were summarized as follows. First, cultural communication in fashion cultural complex space were impacted by cultural brand, cultural display, cultural support and beneficial effect of culture. Second, customers pursued the shopping benefits to get social value, personal pleasure, individual style and economic value. Third, the preference of fashion outlet was effected by cultural brand and cultural display. The beneficial effect of culture and cultural brand influenced on department store preference. The preference of fashion multi-brand shop was impacted by cultural brand, cultural support and beneficial effect of culture. Fourth, cultural communication in fashion cultural complex space had an effect on pursuing shopping benefits. Fifth, customer's demographic characteristics impacted on cultural brand, cultural display and beneficial effect of culture. Especially, these 3 cultural communications were effected by monthly average fashion spending than age/total income.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2002.05a
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• pp.285-292
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• 2002

A cluster tool for semiconductor manufacturing is an integrated device that consists of several single wafer processing modules and a wafer transport module based on a robot. The distributed module controllers are integrated by an inter-module communication network and coordinated by a centralized controller, called a cluster tool controller (CTC). Since the CTC monitors and coordinates the distributed complex module controllers for advanced process control, complex commuication messaging and services between the CTC and the module controllers are required. A SEMI standard, CTMC(Cluster Tool Module Communication), specifies application-level communication service requirements for inter-module communication. We propose the use of high-level fieldbuses, for instance. PROFIBUS-FMS, for implementing CTMC since the high-level fieldbuses are well suited for complex real-time distributed manufacturing control applications. We present a way of implementing CTMC using PROFIBUS-FMS as the communication enabler. We first propose improvements of a key object of CTMC for material transfer and the part transfer protocol to meet the functional requirements of modem advanced cluster tools. We also discuss mapping objects and services of CTMC to PROFIBUS-FMS communication objects and services. Finally, we explain how to implement the mappings.

• The Journal of Korean Society for School & Community Health Education
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• v.24 no.3
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• pp.37-50
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• 2023

Objectives: The aim of this study was to identify factors influencing communication satisfaction between geriatric caregivers and older adults in urban-rural complex communities. The ultimate goal was to design local community educational programs and policies to enhance communication satisfaction among geriatric caregivers and improve the quality of care services for older adults. Methods: To identify factors influencing communication satisfaction between elderly caregivers and older adults, a survey titled "CCEP: Assessment of Communication Status between Elderly Care Service Providers and Recipients" was conducted from February to July 2020, focusing on rural-urban complex areas. The survey was administered based on providers of elderly healthcare services. The survey targeted 131 respondents involved in providing care services for older adults. The dependent variable of this study was the communication satisfaction reported by elderly caregivers in their interactions with the elderly. The independent variables included perceptions of older adults, factors associated with communication difficulties, and communication efforts. Additionally, gender, working environment, working experience, and the proportion of face-to-face interactions with older adults during caregiving were controlled for the hierarchical multiple regression analysis. Results: The analysis revealed that communication efforts with older adults significantly influenced communication satisfaction (β=.09, p<0.01). However, perceptions of the elderly and communication hindrance factors did not have a significant impact on communication satisfaction among geriatric caregivers. Conclusion: Effective communication between geriatric caregivers and older adults is crucial for identifying and meeting the needs and demands of caregiving services, and it plays a vital role in overall caregiving service satisfaction. To enhance communication skills and satisfaction among geriatric caregivers and ensure the appropriate fulfillment of elderly care needs in the local community, the development of community-centered, specialized health communication programs and other initiatives will be necessary in the future.

• Journal of electromagnetic engineering and science
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• v.4 no.3
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• pp.97-101
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• 2004

Complex permittivities of reference liquids were measured by a liquid holder of slotted coaxial line with a movable probe at mobile communication frequencies. The validity of the liquid measurement system was checked by experimental tests with the reference liquids proposed in IEEE Std. 1528-200X or IEC 106/61/CDV.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.9
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• pp.2020-2028
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• 2013

In this paper, we propose a novel analysis and design methodology based on complex network theory for wireless large-scale ad hoc networks. We also enhance the conventional analysis methods which does not sufficiently consider the effect of the wireless communication channels and extend the existing random graph theory by reflecting the wireless communication environments. As a main result, the effect of the network topology such as average degree of each communication node on the network capacity through extensive computer simulations.