• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.1
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• pp.115-123
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• 2017

The purpose of this study was to develop an indicator for the selection of urban regeneration areas through an analytical network process. Therefore, this study derived five criteria and 58 indicators based on previous studies. Five criteria and 16 indicators were derived by taking into account the region and city characteristics of Gong-ju. Next, a survey from 63 urban regeneration experts was performed. The weight values of the criteria were calculated using the super decisions 2.0 program. As a result, population characteristics (0.244) was the most important criteria, followed by the industry economy (0.218), condition of promotion policy (0.193), social culture (0.188), and physical environment (0.158). These results will be used to select potential urban regeneration areas, and will contribute to overall effective urban regeneration.

• Current Research on Agriculture and Life Sciences
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• v.9
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• pp.11-20
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• 1991

This study was performed to avoid the chemical spraying environment condition during spraying operation for operator's safety through the development of a remote controlled speed sprayer. The summerized results of this study are as followings. 1. The developed VHF electric wave remote controlling system which could operate sixteen type of operation conditions with the circuit channels of 234 was highly adaptable to speed sprayer for the remote control. 2. The commerical wireless telephones adapted the DTMF type electric wave remote control system need not the tranceiver. 3. The wireless electric wave remote control system combined with one-chip microcomputer, which are low cost with compact in size, could be adaptable to the remote control of the speed sprayer for the wheel steering and speed control system, and to the remote control chemical application system.

• The Journal of the Korea Contents Association
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• v.9 no.2
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• pp.10-17
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• 2009

This paper analyze the effect of frequency offset for the IEEE 802.15.4b LR-WPAN(Low-Rate Wireless Personal Area Network) with 915MHz bandwidth noncoherent DSSS O-QPSK based receiver system, and presents a compensation method with addition of differential filter to the system for compensation of frequency offset problem. DSSS PSSS-ASK and DSSS O-QPSK modulation techniques are accepted within the regularization of IEEE 802.15.4b. These new method can obtain 250kbps transmission rate. The DSSS O-QPSK modulation method that is used in this paper has no BER variation below 40ppm(frequency offset 36.6kHz), but if the offset frequency become high above 40ppm, then the system cannot have stable receiving condition due to worse BER. To solve this problem, we present a more stabilized receiver system at maximum frequency offset ${\pm}80ppm$ using MDDF unti a correlator of DSSS O-QPSK modulator. Moreover computer simulation results will be presented to evaluate the performance of the proposed algorithm unde various AWGN and frequency offset environment.

• Journal of Advanced Navigation Technology
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• v.19 no.3
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• pp.237-243
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• 2015

This paper presented the design of wireless power transfer (WPT) system using electromagnetic induction techniques and analysed WPT efficiency. Also, we presented the optimum coil condition by measuring the efficiency variation according to some receiving coil parameter changes. Voltage change is measured by receiving coil position for the designed transmitting and receiving circuit. Voltage change according to inductance variation at the same position and charging time are compared at the same environment by using a developed application program to realize an optimum WPT system. Developed wireless power transfer system using electromagnetic induction techniques uses 125 kHz. It takes 16 minutes by using wired charger, and 23 minutes by using wireless charger for charging from 50% to 60% charging status.

• Journal of KIISE:Information Networking
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• v.31 no.5
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• pp.450-459
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• 2004

This paper studies the collective communication in the grid computing environment, which is characterized by the combination of heterogeneous networks as well as uneven, long communication delay. Efficient collective communication requires communication schedule, which in turn requires network information. When the network information is not accurate or network faults occur, the performance of collective communication can be markedly degraded. This paper proposes TTCC(Two-Tree Collective Communication) for scheduling collective communication in the grid. It Provides an efficient and reliable schedule even In this unfavorable network condition by maintaining two disjoint communication trees. Benefits of the proposed method are manifested via simulation, where the performance degradation with TTCC is much slower than those using conventional scheduling algorithms.

• The Journal of the Korea Contents Association
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• v.6 no.10
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• pp.9-16
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• 2006

In this paper, the acoustic model output of CSR(Continuous Speech Recognition) was used to analyze news data News database used in this experiment was consisted of 2,093 articles. Due to the low efficiency of language model, conventional Korean CSR is not appropriate to the analysis of news data. This problem could be handled successfully by introducing post-processing work of recognition result of acoustic model. The acoustic model more robust than language model in Korean environment. The result of post-processing work was made into KIF(Keyword information file). When threshold of acoustic model's output level was 100, 86.9% of whole target morpheme was included in post-processing result. At the same condition, applying length information based normalization, 81.25% of whole target morpheme was recognized. The purpose of normalization was to compensate long-length morpheme. According to experiment result, 75.13% of whole target morpheme was recognized KIF(314MB) had been produced from original news data(5,040MB). The decrease rate of absolute information met was approximately 93.8%.

• Journal of the Korean Applied Science and Technology
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• v.36 no.4
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• pp.1410-1419
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• 2019

In this research, it is to find a method that frost does not form on the outdoor unit to develop a heat pump capable of heating in cold regions. For this reason, we produced an incubator capable of creating an environment of -25℃, and constructed an experimental apparatus so that experiments in the room were possible. However, it is necessary to grasp the characteristics of the air reaching the front of the heat pump outdoor unit installed in the experimental apparatus, and flow analysis was performed using ANSYS CFX, which is general-purpose software. As a result, the flow velocity of the air reaching the front of the outdoor unit in the outdoor unit chamber in the entire region of the simulation conditions (5.0 to 7.5 m/s) has many differences in the upper and lower portions, resulting in a natural state. It turned out that the condition can not be satisfied. Therefore, it is determined that it is necessary to additionally install a frequency divider at the front of the outdoor unit to make the flow velocity constant.

• Journal of Distribution Science
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• v.16 no.6
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• pp.65-75
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• 2018

Purpose - The exhibition is one of the critical distribution channels that leads to mass sales of products. Servicescape is considered as an effective means facilitating consumers' purchasing behavior. The objective of this research is to examine the effects of servicescape of the exhibition on consumer's purchasing behavior measured by time spent, the number of consultations, the number of items purchased, and amount of money spent. Research design, data, and methodology - Servicescape was divided into four main components: 'spatial layout/functionality', 'ambient condition', 'design/artifacts', and 'human factor'. Based on previous studies, this study hypothesized that servicescape dimensions first influence consumer's shopping duration and the number of consultations which in turn, affects consumer's actual purchase. A total of 407 samples were collected from attendees in Baby Expo taken place in Kyunggido, South Korea. The data were used to assess overall fit of the proposed model and test hypotheses using structural equation modeling. All the constructs had acceptable levels of composite reliability and convergent and discriminant validity. Results - The results showed that except for 'spatial layout/functionality', all components of servicescape had a significant influence on consumer's shopping duration in the exhibition. Except for 'design/artifacts', other factors of servicescape did not show a significant effect on 'the number of consultations'. Interestingly, 'design/artifacts' exerted a significant negative effect on 'the number of consultations'. As expected, 'time spent' and 'number of consultations' showed significant effects on both 'the number of items purchased' and 'amount of money spent'. Conclusions - The results offer some insights into the effect of servicescape on facilitating consumers' purchasing behavior in the context of the exhibition. Theoretically, this study provides a new type of conceptual framework that verifies the relationships between not only servicescape and purchasing behavior, but also purchasing behavior-related variables. In addition, this study supports the concept of a dark side of servicescape. With regards to practical implications, this study suggests that exhibition organizers should put more efforts in facilitating consumer's desire to stay. More importantly, organizers need to keep in mind that excessive emphasis on 'design/artifacts' to increase consumers' shopping duration can cause a side effect that reduces opportunities for interactions with customers.

• The Journal of the Korea Contents Association
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• v.15 no.9
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• pp.61-71
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• 2015

Developing cultural contents in cultural creativity industry is very practical process recently. Research about Jeju's legend and myth should be the basic theory for cultural contents development based on local cultures. Jeju Naewotdang Musindo 10 gods paintings are unique colored pictures, appointed as Jeju folklore material No.7 and national important folklore material No. 240. Jeju-Do is remained the springhead of absorbed into unique culture for a long time because of Jeju's geographical environment condition. Jeju Musindo could be related with the symbol of Jeju's myth images and the springhead of emotions of our typical country people. It would be analysed by Wucius Wong's design style theory for approaching visual image and symbolic meaning. This research about Jeju Naewotdang Musindo 10 gods paintings could provide design analysis methodology for further theoretical studies about Jeju's legend and myth for Jeju's unique cultural contents.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.5
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• pp.1010-1019
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• 2004

In this paper, we represent Nakagami-m fading channel as finite-State Markov Channel (FSMC) and analyze the performance of wireless communication system with varying the fading channel condition. In FSMC model, the received signal's SNR is divided into finite intervals and these intervals are formed into Markov chain states. Each state is modeled by a BSC and the transition probability is dependent upon the physical characterization of the channel. The steady state probability and average symbol error rate of each state and transition probability are derived by numerical analysis and FSMC model is formed with these values. We found that various fading channels can be represented with FSMC by changing state transition index. In fast fading environment in which state transition index is large, the channel can be viewed as i.i.d. channel and on the contrary, in slow fading channel where state transition index is small, the channel can be represented by simple FSMC model in which transitions occur between just adjacent states. And we applied the proposed FSMC model to analyze the coding gain of random error correcting code on various fading channels via computer simulation.