• Journal of Information Processing Systems
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• 제11권4호
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• pp.583-600
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• 2015

Generally, the wireless network provides priority to handover calls instead of new calls to maintain its quality of service (QoS). Because of this QoS provisioning, a call admission control (CAC) scheme is essential for the suitable management of limited radio resources of wireless networks to uphold different factors, such as new call blocking probability, handover call dropping probability, channel utilization, etc. Designing an optimal CAC scheme is still a challenging task due to having a number of considerable factors, such as new call blocking probability, handover call dropping probability, channel utilization, traffic rate, etc. Among existing CAC schemes such as, fixed guard band (FGB), fractional guard channel (FGC), limited fractional channel (LFC), and Uniform Fractional Channel (UFC), the LFC scheme is optimal considering the new call blocking and handover call dropping probability. However, this scheme does not consider channel utilization. In this paper, a CAC scheme, which is termed by a uniform fractional band (UFB) to overcome the limitations of existing schemes, is proposed. This scheme is oriented by priority and non-priority guard channels with a set of fractional channels instead of fractionizing the total channels like FGC and UFC schemes. These fractional channels in the UFB scheme accept new calls with a predefined uniform acceptance factor and assist the network in utilizing more channels. The mathematical models, operational benefits, and the limitations of existing CAC schemes are also discussed. Subsequently, we prepared a comparative study between the existing and proposed scheme in terms of the aforementioned QoS related factors. The numerical results we have obtained so far show that the proposed UFB scheme is an optimal CAC scheme in terms of QoS and resource utilization as compared to the existing schemes.

• 유통과학연구
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• 제15권3호
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• pp.61-72
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• 2017

Purpose - The ICT development is affecting the consumer behaviors in selecting channel or distribution system. This study aims to advance the theory on the influence and interaction with omni-channel behaviors. Specifically, analyzing moderating variable is category knowledge that effect between propensity of brand loyalty and its precedence factor which is perceived difference, perceived value, authenticity and consumer-brand relationship. Research design, data, and methodology - The subject of this research is consumers who purchase goods in omni-channel situation. The hypothesis of this research is derived from the literature of the preceding research analysis on brand loyalty, omni-channel and consumer behaviors. This study have constructs that were defined operationally with reference to previous studies, and the research model was designed to figure out the structural relationship among perceived difference, perceived value, authenticity, consumer-brand relationship and brand loyalty. From 2016 Sept. 1 to Dec. 31, a questionnaire survey was performed targeting customers using omni-channel. 327 questionnaire survey had conducted. 316 survey data were used for empirical analysis except data that had missing and wrong value. AMOS(structural equation) was used to confirm the hypothesis which developed by researcher. Results - The results of this study are as follows. First, an authenticity has significant effect on brand loyalty. Second, in the omni-channel situation, but perceived differentiation, perceived value, consumer-brand relationship does not affect brand loyalty. According to this result, it is judged that it is easy to search for information in the situation of omni-channel and integrated decision making is done without distinction between channels. Third, category knowledge has moderating effect between brand loyalty and precedence factors. When the category knowledge level is low, preceding factors have a significant effect on brand loyalty. when the category knowledge level is high, the preceding factors did not have a significant effect on brand loyalty except the authenticity. Conclusions - This study finds out omni-channel's phenomenon is different from other distribution channel phenomenon. In the situation of omni-channel, it is suggested that brand loyalty may be relatively low for a certain brand because it raises the knowledge level of the category. Then this study provides a managerial implications based on the role of the moderate effect on category knowledge, brand loyalty and omni-channel.

• 한국산업정보학회논문지
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• 제28권6호
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• pp.151-171
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• 2023

본 연구의 목적은 은행의 효율적인 채널전략 수립을 위해 채널을 유형별로 분류하고, 분류된 유형에 따라 대응분석을 실시하여 채널모형을 제안하는 것이다. 이를 위해 은행원 대상 설문조사를 실시하여 범주형 자료를 시각화하고 포지셔닝 맵을 작성하였다. 그 결과 첫째, 12개 은행채널을 업무처리 주체와 장소를 기준으로 4개 유형으로 분류하고, 이를 다시 풀뱅킹과 셀프뱅킹으로 그룹화 하였다. 둘째, 분류된 유형에 따라 대응분석을 실시하여 점포형은 상품설명과 고객관리에 적합하고, 뱅킹형은 시·공간 제약 없이 효율적인 업무처리에 적합하며, 기기형과 뱅킹형은 고객관리에 부적합하고, 이동형은 인식부족으로 운영효과가 낮은 상태라는 결과를 도출하였다. 이는 은행업무의 특성을 반영하고 채널간 부족한 부분을 보완하는 하이브리드형 융합채널이 필요함을 의미한다. 셋째, 업무처리주체와 장소로 구성된 2×2모형위에 공통분면이 추가된 채널모형을 도출하였다. 따라서 본 연구는 고객의 은행채널 선택요인을 바탕으로 채널 다각화와 채널유형 별 역할분담 요소를 고찰함에 기여하고, 미래채널 전략수립과 효율적인 채널운영을 위한 기초연구 결과를 제시하였다는 점에서 연구의 의의를 가진다.

• 대한한의학회지
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• 제15권2호
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• pp.334-353
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• 1994

Bibliographic study on the qi of Chong Channel ascending adversely(衝氣上衝) through the oriental medical books was carried out. And the following results were obtained; 1. Etiological factors of the qi of Chong Channel ascending adversely were failure of the kidney in receiving air(腎虛不納), transverse invasion of the hyperactive liver-qi (肝氣橫恣), insufficiency of the stomach-qi (胃氣虛弱), deficiency of the Front Midline Channelyin(任陰不足), etc. 2. Main symptom of the qi of Chong Channel ascending adversely were upward adverseness of qi to the chest(氣上衝胸). 3. Therapeutic measures of the qi of Chong Channel ascending adversely were relieving Chong Channel(鎭衝), astringing Chong Channel(斂衝), lowering the adverse flow of qi(降逆), tranquilizing Chong Channel(安衝). 4. Main durgs of the qi of Chong Channel ascending adversely were Fluoritum, Haematitum, TuberPinelliae, Fossilia Ossis Masto야, Concha Ostreae, Flos Inulae, etc. 5. Main prescriptions of the qi of Chong Channel ascending adversely were Kangwijinchongtang(降胃鎭衝湯), Younggyeogamtang(?桂五甘湯), etc.

• 한국유통학회지:유통연구
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• 제10권2호
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• pp.1-26
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• 2005

본 연구는 증권거래 채널의 선택에 영향을 미치는 소비자 요인을 파악하는데 그 목적을 두고 있다. 본 연구는 오프라인 채널이 관계마케팅이 실현되는 채널이라는 관점과 온라인 채널은 인터넷 거래라는 관점에서 14개의 소비자 요인을 추출하였다. 자료 분석 결과 14개의 가설변수 가운데 8개 변수가 두 집단간에 유의한 차이를 보이는 것으로 나타났다. 즉, 대인 성향, 위험감수 성향, 투자 규모, 가격민감도, 인터넷 사용 시간, 혁신성, 정보 프라이버시 민감도, 내재적 정보 욕구 등의 변수에서 유의한 차이를 보였다. 유의하게 나타난 변수들을 독립변수로 하는 판별분석 결과는 이들 변수들 가운데에서도 특히 위험감수 성향, 인터넷 사용 시간, 정보 프라이버시 민감도 등의 변수들이 두 집단을 구분하는데 유용함을 보여주고 있다.

• 동력기계공학회지
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• 제17권1호
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• pp.64-70
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• 2013

The heat transfer and friction factor characteristics of turbulent flows in three stationary channels have been investigated experimentally to check out the effect of divergence ratio. These are a constant cross-sectional channel and two diverging channels with ratio of divergence(Dho/Dhi) of 1.16 and 1.49. The measurement was conducted within the range of Reynolds numbers from 15,000 to 89,000 and the dimension of uniform cross-sectional test section is $100mm{\times}100mm$ at the cross section and 1,000 mm in length. The measurements of heat transfer coefficients and friction factors in the uniform channels were conducted as a reference. Because of the streamwise flow deceleration, the heat transfer and friction factor characteristics in the diverging channel were quite different from those of the constant cross-sectional channel. The effective friction factors and convective heat transfer coefficients increased with increasing the ratio of divergence of the channel.

• 산업융합연구
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• 제1권1호
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• pp.143-157
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• 2003

This paper examines the changed consumer perception to internet based channel. Internet based channel has time merit, place merit, assortment merit, compatibility merit, and so on. For seller, in the mean while, it has merits in the way of diminishing physical distribution cost, promotion cost, and reaching globally in the same time. In spite of so many merits of internet based channel, there were many types complain in past. Most of all, consumers expect that it will provide low-price merit to consumer, because it doesn't need shop, warehouse, stock, etc. Based on the empirical analyses in past, it didn't work, especially to price oriented consumer's perception. But in this research, it shows changing consumer's perception. Comparing past data with current data, we found outstanding gross in price related variables figure. But, in goods delivery related factors and personal credit information related factor, consumer recognized much more negatively yet. So, we conclude that even though some factors show improved perception, there are tasks to solve. We will observe the tuning point at that time.

• Journal of electromagnetic engineering and science
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• 제6권4호
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• pp.203-208
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• 2006

Channel estimation and data detection for OFDM systems over time- and frequency-selective channels are investigated. Relying on the complex exponential basis expansion channel model, a pilot-embedded channel estimation scheme with low computational complexity and spectral efficiency is proposed. A periodic pilot sequence is superimposed at a low power on information bearing sequence at the transmitter before modulation and transmission. The channel state information(CSI) can be estimated using the first-order statistics of the received data. In order to enhance the performance of channel estimation, we recover the transmitted data which can be exploited to estimate CSI iteratively. Simulation results show that the proposed method is suitable for doubly-selective channel estimation for the OFDM systems and the performance of the proposed method can be better than that of the Wiener filter method under some conditions. Through simulations, we also analyze the factors which can affect the system performances.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 추계학술대회 논문집
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• pp.113-114
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• 2007

Hole mobility characteristics of single surface channel and dual channel Si/SiGe structure are compared, where the former one consists of a relaxed SiGe buffer layer and a tensile strained Si layer on top, and for dual channel structure a compressively strained SiGe layer is inserted between them. Due to the difference of hole mobility enhancement factors of layers between them, hole mobility characteristics with respect to the Si cap thickness shows the opposite tend. Hole mobility increases with thicker Si cap for single channel structure, whereas it decreases with thicker Si cap for dual channel structure.

• The Journal of Asian Finance, Economics and Business
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• 제8권5호
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• pp.355-364
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• 2021

The main objective of this study is to examine the interactive effect of technology spillover channels on business efficiency within the case study of manufacturing industry of Vietnam during the period from 2012 to 2018. The research model was developed with business efficiency as dependent variable and the relevant factors affecting the technology spillover capacity as independent variables. With a sample of 2,776 cross-sectional enterprises, panel data analysis approach was adopted to estimate the impact of technology spillover issue. Different spillover channels were also included in the analysis to enhance the empirical result. The study reveals that technology spillovers positively influence manufacturing business efficiency, in which horizontal spillover channel produces negative impact and vertical spillover channel, creates positive impact. Several factors that negatively affect the technology spillover capacity of businesses could be mentioned such as limited skills and experiences of workers, methods of implementing R&D, and the existence of FDI enterprises. Meanwhile, the rise of other factors related to joint-venture activities can help to increase the technology spillover capacity of businesses. In addition, skill and experience transfer makes a partial impact since this variable only positively affect the vertical spillover channel and provide no evidence of impact regarding horizontal spillover channel model.