• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권1호
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• pp.114-130
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• 2021

With the drastic growth of Information and Communication Technology (ICT) industry, global energy consumption is exponentially increased by mobile communications. The huge energy consumption and increased environmental awareness have triggered great interests on the research of dynamic distribution of cell user and traffic, and then designing the energy efficient cellular network. In this paper, we explore the temporal and spatial characteristics of human mobility and traffic distribution using real data set. The analysis results of cell traffic illustrate the tidal effect in temporal and spatial dimensions and obvious periodic characteristics which can be used to design Base Station (BS) dynamic with sleeping or shut-down strategy. At the same time, we designed a new Cell Zooming and BS cooperation mode. Through simulation experiments, we found that running in this mode can save about 35% of energy consumption and guarantee the required quality of service.

• 기술혁신학회지
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• 제12권3호
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• pp.457-470
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• 2009

본 연구는 세계 84개 국가를 대상으로 인적자본형성수준과 기술진보에 대한 인과관계를 추적였다. 실증분석결과는 크게 세 가지로 요약할 수 있다. 첫째, 1980에 비하여 2000년도에 소득분배불균등성은 상대적으로 증가되었다. 둘째, 역시 84개 국가를 대상으로 한 기술진보수준에 대한 불평등성도 증가하였으나, 인적자본형성수준에 대한 불평등도는 감소하였다. 마지막으로 인적자본현성수준에 따른 세계국가의 기술진보불균등도에 대한 이동성측면을 보면, 1980년도에서 1990년도에는 인적자본형성이 높은 집단일수록 기술진보수준불균등정도는 개선되고 있었으며, 1990년에서 2000년도까지의 실증분석결과는 동일한 결과를 나타냈다. 그러나 전 동기(1980-1990)보다는 후반기(1990-2000)에 개선정도는 낮았다. 이러한 실증분석결과로 볼 때, 인적자본형성을 통하여 기술진보를 이룩한다는 기존 연구결과는 전반적으로 뒷받침되고 있으나, 그 개선정도가 낮아지고 있기 때문에, 지속적 경제발전 및 기술진보를 위하여 인적자본이 기술진보에 미치는 전달메커니즘의 효율성을 제고할 수 있는 정책방향전환이 요구된다.

• 자동차안전학회지
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• 제12권1호
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• pp.6-14
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• 2020

Personal mobility, which was used exclusively for leisure activities, has recently been used as a means of transportation, and it is expected to increase its role as the next generation transportation. Sales of personal mobility are increasing rapidly, but the problem is that traffic accidents are also increasing. In this study, human body injury caused by various collisions between electric wheel users and road users that occur on bicycle or pedestrian roads mainly used by personal mobility is analyzed through collision analysis and collision risk analysis. In the case of the collision accident for electric wheel, it is analyzed that the road users are more likely to be injured on the pedestrian road than the bicycle road. In addition, the head hit each other or fall and hit the floor caused severe head injury.

• International Journal of Computer Science & Network Security
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• 제22권4호
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• pp.139-146
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• 2022

Wireless access technologies are emerging to enable high data rates for mobile users and novel applications that encompass both human and machine-type interactions. An essential approach to meet the rising demands on network capacity and offer high coverage for wireless users on upcoming fifth generation (5G) networks is heterogeneous networks (HetNets), which are generated by combining the installation of macro cells with a large number of densely distributed small cells Deployment in 5G architecture has several issues because to the rising complexity of network topology in 5G HetNets with many distinct base station types. Aside from the numerous benefits that dense small cell deployment delivers, it also introduces key mobility management issues such as frequent handover (HO), failures, delays and pingpong HO. This article investigates 5G HetNet mobility management in terms of radio resource control. This article also discusses the key challenges for 5G mobility management.

• 노동경제논집
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• 제33권2호
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• pp.53-89
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• 2010

취업 산업수요의 지역 범위 설정은 전문계고 교육과정 설계를 위한 선결요건이다. 시 도 교육청의 권한 구역을 기준으로 취업자의 약 38%가 지역 이동하여 첫 번째 직업을 가졌으며 상당수가 상업 계열을 졸업한 여성으로 제조업/전기 전자 직종에 취업하였다. 지역이동은 자격증과 같은 개인의 인적자본과 정(正)의 관계가 있었다. 지역이동의 임금효과는 기술수준이 높은 직업에 취업함으로써 얻은 간접효과보다는 지역이동의 직접효과였다. 성향점수 매칭 및 Rosenbaum(2002)의 민감도 분석을 활용한 결과는 지역이동의 유의미한 임금효과를 보였다.

• 한국의류산업학회지
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• 제9권1호
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• pp.6-14
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• 2007

The purpose of this study was to delve into what type of expression mode of fashion design could suit the life style of digital nomads, as the appearance of nomadic life style was concurrent with people's modified way of thinking and sociocultural changes in today's digital society. It's basically meant to define the roles of fashion design, which was discussed as a way of improving the quality of life as a sort of 'culture,' and to suggest some of the right directions for fashion design in the future. The culture of today's digital era is marked by a pursuit of high mobility and high speed, and by nomadic disposition that is built on flexible thinking. The kind of design that lets people carry nomadic things with them and thereby improve their mobility can satisfy their needs for mobility, and body-friendly design that functions as a device of information in itself can meet their needs for mobility as well. The leading example of the latter is a wearable computer, and wearable scientific technology will be taken to another level, thanks to the advance in digital technology. In the future, that will be more accessible to people in general, and subminiature digital equipment will gain popularity in fashion industry as part of textiles and clothing or as an accessory. And specific kinds of design will be widespread, including variable design, multi-functional design and modular design. The first serves as a tool to protect the human body and to facilitate the adaptability of it to the given circumstances, and the second is characterized by a superb physical and psychological protectability. The third lets wearers bring design to completion at their own option, owing to an increase in the number of open-minded people and the development of interactive media. All these types of design could be called a wearer-friendly, human-oriented design that is specifically appropriate for the digital age. Wearers can actively be involved in design process as productive consumers, which is expected to help increase opener practices in fashion design sector.

• 한국의류학회지
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• 제31권3호
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• pp.343-350
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• 2007

This study compared and studied the clothing mobility of two types of aerobic clothes - those made of currently popular stretch materials and those made of new stretch materials that were specially developed for this study. The focus of the comparison was on the range of joint movement during activity, and the physiological burden imposed on the body by the clothes. In total, 18 experiments were carried out under controlled conditions in an artificial climatic chamber with a temperature of $25{\pm}1^{\circ}C$, air humidity of $60{\pm}5^{\circ}C$ and negligible air movement. Each exercise program consisted of a 30-minute of aerobic workout and a 20-minute rest following the exercise. Measurements were taken to determine the following: physiological reactions (whole-body and local sweat rates), subjective sensations(of temperature, humidity, comfort, tightness, and clothing wetness), joint angle(measured with a goniometer), and so on. The results of the study us as follows: Material B excels in clothing mobility. Material C excels in sweat absorbency and drying speed. Material A was found to be the hottest material, while material C was found to be slightly hot through the analysis of the change in pre- and post-exercise bodyweight(= amount of sweat). Regarding the amount of evaporated sweat, material A>material C>material B. Material B produced the smallest amount of evaporated sweat. The wider the range of joint movement, the smaller the amount of sweat and the lower the average skin temperature.

• 가정과삶의질연구
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• 제29권3호
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• pp.13-22
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• 2011

The purpose of the study is to analyze the residential mobility effects and planning discrepancies of home-owning households and renting households. The data for the empirical analysis were collected from 248 units residing in Ulsan and were studied using descriptive statistics, chi-squared tests by cross-tabulation and multiple regressions. The majority of the households did not experience a change in types of housing structure or ownership after the residential mobility. However, the housing size increased after residential mobility, showing that most moves were due to the deficit of housing sizes. In terms of future mobility plans, there were significant differences between home-owning households and renting households. More than two-thirds of the renting households were willing to move within 2-4 years to obtain home ownership. On the other hand, most home-owning households were willing to move for housing size, education of the head, and investment purposes. Compared to the forty-four percent of the home-owning households, seventy-two percent of the renting households were willing to relocate, which shows the effects of unstable housing circumstances.

• 노동경제논집
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• 제19권1호
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• pp.247-271
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• 1996

• 대한가정학회:학술대회논문집
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• 대한가정학회 1997년도 Program & Abstracts * The 7th Korea-Japan Home Economics Joint Syposium
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• pp.243-243
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• 1997