• Journal of Information Processing Systems
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• v.12 no.2
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• pp.196-213
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• 2016

System Architecture Evolution (SAE) with Long Term Evolution (LTE) has been used as the key technology for the next generation mobile networks. To support mobility in the LTE/SAE-based mobile networks, the Proxy Mobile IPv6 (PMIP), in which the Mobile Access Gateway (MAG) of the PMIP is deployed at the Serving Gateway (S-GW) of LTE/SAE and the Local Mobility Anchor (LMA) of PMIP is employed at the PDN Gateway (P-GW) of LTE/SAE, is being considered. In the meantime, the Host Identity Protocol (HIP) and the Locator Identifier Separation Protocol (LISP) have recently been proposed with the identifier-locator separation principle, and they can be used for mobility management over the global-scale networks. In this paper, we discuss how to provide the inter-domain mobility management over PMIP-based LTE/SAE networks by investigating three possible scenarios: mobile IP with PMIP (denoted by MIP-PMIP-LTE/SAE), HIP with PMIP (denoted by HIP-PMIP-LTE/SAE), and LISP with PMIP (denoted by LISP-PMIP-LTE/SAE). For performance analysis of the candidate inter-domain mobility management schemes, we analyzed the traffic overhead at a central agent and the total transmission delay required for control and data packet delivery. From the numerical results, we can see that HIP-PMIP-LTE/SAE and LISP-PMIP-LTE/SAE are preferred to MIP-PMIP-LTE/SAE in terms of traffic overhead; whereas, LISP-PMIP-LTE/SAE is preferred to HIP-PMIP-LTE/SAE and MIP-PMIP-LTE/SAE in the viewpoint of total transmission delay.

• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.457-462
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• 2005

Industrial and economical importance of CP(Cellular Phone) is growing rapidly. Combined with IT technology, CP is currently one of the most attractive technologies for all. However, unless we find a breakthrough to the technology, its growth may slow down soon. RT(Robot Technology) is considered one of the most promising next generation technology. Unlike the industrial robot of the past, today's robots require advanced technologies, such as soft computing, human-friendly interface, interaction technique, speech recognition, object recognition, and many others. In this study, we present a new technological concept named RCP(Robotic Cellular Phone), which combines RT & CP, in the vision of opening a new direction to the advance of CP, IT, and RT all together. RCP consists of 3 sub-modules. They are $RCP^{Mobility}$, $RCP^{Interaction}$, and $RCP^{Interaction}$. $RCP^{Mobility}$ is the main focus of this paper. It is an autonomous navigation system that combines RT mobility with CP. Through $RCP^{Mobility}$, we should be able to provide CP with robotic functionalities such as auto-charging and real-world robotic entertainments. Eventually, CP may become a robotic pet to the human being. $RCP^{Mobility}$ consists of various controllers. Two of the main controllers are trajectory controller and self-localization controller. While Trajectory Controller is responsible for the wheel-based navigation of RCP, Self-Localization Controller provides localization information of the moving RCP. With the coordinate information acquired from RFID-based self-localization controller, Trajectory Controller refines RCP's movement to achieve better RCP navigations. In this paper, a prototype system we developed for $RCP^{Mobility}$ is presented. We describe overall structure of the system and provide experimental results of the RCP navigation.

• Journal of Korean Academy of Nursing
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• v.31 no.5
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• pp.818-834
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• 2001

This study aims at confirming exercise effects on obesity, mobility, self-efficacy, process of change, and decisional component by stage based exercise motivational intervention program for the elderly. The stage based exercise intervention program was constructed based on Transtheoretical Model. Methods: The design of this study is nonequivalent control group with repeated measuring by quasi-experimental study. The subjects of this study, composing of experimental group of 32 and control group of 28 were selected at one institution for the aged in Seoul. Results: 1) The body fat (weight, BMI and circumference of waist), of the intervention group was significantly decreased than the control group. 2) The mobility of the intervention group was not significantly increased than control group. 3) The self-efficacy, Pros, Process of Change for exercise of the intervention group was not significantly increased than the control group. 4) The Cons for exercise of intervention group was not significantly decreased than the control group. Conclusion: The above result have informed us that a stage-based exercise motivational intervention program for the elderly has the effect of decreasing old persons' body fat and has value as an effective means of nursing for the elderly.

• Journal of Korean Physical Therapy Science
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• v.31 no.2
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• pp.15-29
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• 2024

Background: This study investigated the effects on the range of motion, pain, disability index, and quality of life when applying thoracic mobility exercise in middle-aged women with chronic back pain. Design: pretest-posttest control group design Methods: The study subjects were 32 patients with chronic back pain of 3 months or more among middle-aged women divided 2 groups. All groups were tested thrice a week for 30 minutes per session for four weeks. Each subject was evaluated using the thoracic rotation Range of Motion, the numerical pain rating scale and pressure pain threshold, Disability Index(Oswestry Disability Index), the Quality of Life(SF-36) before and after treatment. Results: As a result of the study, the range of motion at T1 and T2 of the exercise group to which thoracic mobility exercise was applied was significantly increased in both left and right rotations(p<0.05). In the evaluation of pain, the number pain rating scale(NPRS) score decreased significantly(p<0.05), and the pressure pain threshold was significantly increased (p<0.05), but there was no significant difference from the control group. In the evaluation of the disorder index, the Oswestry disorder index decreased significantly after the experiment (p<0.05), and there was a significant difference in group comparison with the control group (p<0.05). In quality of life, there was a significant increase in PCS of SF-36(p<0.05), but there was no significant difference from the control group. Conclusion: Through this study, thoracic mobility exercise can be used as an effective exercise therapy intervention method to improve and promote physical factors of range of motion, pain and disability index, and physical components of quality of life when treating middle-aged women with chronic back pain in the future.

• Korean Institute of Interior Design Journal
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• v.20 no.2
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• pp.110-119
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• 2011

The purpose of this study is to analyze the development and characteristics of Dymaxion housing by R. B. Fuller, who is generally known as a structure engineering, architect and his influences. A document research method was used to analyze and classified of his dymaxion housing projects focused on the late of 1920's. Through this study, the following conclusions have been reached; 1) In order to obtain the productivity and efficiency drawing from the industrialized housing in the early of 1900s, the planning concepts of 'Dymaxion', 'Ehemeralization' and 'Autonomy' were proposed. 2) The planning characteristics of Dymaxion housing projects are classified as three aspects. The first is 'formative aspects' which was focused on the round-shape, transparency and lightweight material such as aluminium for movable and flexible dwelling. The second is 'functional aspects', focused on the mass-production, mobility, flexibility, high-tech and systemizing mechanical equipments for efficiency of household affairs. The third is 'environmental aspects', focused on the energy-saving and environmental control for sustainable dwelling. Dymaxion housing projects of Fuller, an aggregation of high-tech mechanical equipments, had a great impact on the development the concept of mobility and influenced radical and utopian architectural groups' ideas of 1960's. Especially, considering today's high cost of energy and the limited natural resources, Fuller's Dymaxion theory must be re-evaluated.

• Particle and aerosol research
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• v.5 no.2
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• pp.83-90
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• 2009

This paper describes a condensation-evaporation method (CEM) to produce size-controlled spherical silver nanoparticles by perturbing coagulation and coalescence processes in the gas phase. Polydisperse silver nanoparticles generated by the CEM were first introduced into a differential mobility analyzer (DMA) to select a group of silver nanoparticles with same electrical mobility, which also enables to make a group of nanoparticles with elongated structures and same projected area. These silver nanoparticles selected by the DMA were then in-situ sintered at ${\sim}600^{\circ}C$, and then they were observed to turn into spherical shaped nanoparticles by the rapid coalescence process. With the assistance of modified converging-typed quartz reactor, we can also produce the 10 times higher number concentration of silver nanoparticles compared with a general quartz reactor with uniform diameter. Finally, the spherical silver nanoparticles with 30 nm were electrostatically deposited on the surface of silicon substrate with the coverage rate of ~4%/hr. This useful preparation method of size-controlled monodisperse silver nanoparticles developed in this work can be applied to the various studies for characterizing the physical, chemical, optical, and biological properties of nanoparticles as a function of their size.

• IEMEK Journal of Embedded Systems and Applications
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• v.13 no.2
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• pp.83-91
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• 2018

With the development of IT (Information Technology) technology, embedded system and network technology are combined and used in various environments such as military environment as well as everyday life. In this paper, we propose a new airdropped distributed mobility model (ADMM) modeling the dispersion falling of the direct shot of a cluster bomb, and we compare and analyze some representative MANET routing protocols in ADMM in ns-3 simulator. As a result of the analysis, we show OLSR routing protocol is promising in ADMM environment in the view points of packet delivery ratio (PDR), end to end delay, and jitter. In addition, we propose a new adaptation scheme for OLSR, AND-OLSR (Average Node Distance based adaptive-OLSR) to improve the original OLSR in ADMM environment. The new protocol calculates the average node distance, adapts the period of the control message based on the average node distance increasing rate. Through the simulation study, we show that the proposed AND-OLSR outperforms the original OLSR in PDR and control message overhead.

• Journal of information and communication convergence engineering
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• v.11 no.3
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• pp.153-166
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• 2013

A hierarchical time division multiple access (HTDMA) medium access control (MAC) protocol is proposed for clustered mobile underwater acoustic networks. HTDMA consists of two TDMA scheduling protocols (i.e., TDMA1 and TDMA2) in order to accommodate mobile underwater nodes (UNs). TDMA1 is executed among surface stations (e.g., buoys) using terrestrial wireless communication in order to share mobility information obtained from UNs which move cluster to cluster. TDMA2 is executed among UNs, which send data to their surface station as a cluster head in one cluster. By sharing mobility information, a surface station can instantaneously determine the number of time slots in a TDMA2 frame up to as many as the number of UNs which is currently residing in its cluster. This can enhance delay and channel utilization performance by avoiding the occurrence of idle time slots. We analytically investigate the delay of HTDMA, and compare it with that of wellknown contention-free and contention-based MAC protocols, which are TDMA and Slotted-ALOHA, respectively. It is shown that HTDMA remarkably decreases delay, compared with TDMA and Slotted-ALOHA.

• Annals of Rehabilitation Medicine
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• v.42 no.6
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• pp.854-862
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• 2018

Objective To investigate the effect of treadmill training with eyes open (TEO) and closed (TEC) on the knee joint position sense (JPS), functional balance and mobility in children with spastic diplegia. Methods Forty-five children with spastic diplegia aged 11-13 years participated in this study. They were randomly assigned to three groups of equal number. The control group (CON) underwent designed physical therapy program whereas, the study groups (TEO and TEC) underwent the same program, in addition to treadmill gait training with eyes open and closed, respectively. Outcome measures were the degree of knee joint position error, functional balance and mobility. Measurements were taken before and after 12 weeks of intervention. Results After training, the three groups showed statistically significant improvement in all measured outcomes, compared to the baseline with non-significant change in the knee JPS in the CON group. When comparing posttreatment results, the TEC group showed greater significant improvement in all measured outcomes, than the TEO and CON groups. Conclusion Treadmill training with eyes open and closed is effective in rehabilitation of children with diplegia, but blocked vision treadmill training has more beneficial effect.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.4
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• pp.211-221
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• 2012

The development of wireless sensor networks (WSNs) is progressed slowly due to limited resources, but it is in progress to the development of the latest IP-based IP-WSN by the development of hardware and power management technology. IPv6 over Low power WPAN (6LoWPAN) is capable of IPv6-built low-power devices. In these IP-based WSNs, existing IP-based techniques which was impossible in WSNs becomes possible. 6LoWPAN is based on the IEEE 802.15.4 sensor networks and is a IPv6-supported technology. Host-based mobility management scheme in IP-WSNs are not suitable due to the additional signaling, network-based mobility management scheme is more suitable. In this paper, we propose an enhanced PMIPv6-based route optimization scheme which consider multi-6LoWPAN network environments. All SLMA (Sensor Local Mobility Anchor) of the 6LoWPAN domain are connected with the SPIG (Sensor Proxy Internetworking Gateway) and performs distributed mobility control for the 6LoWPAN-based inter-domain operations. All information of SLMA in 6LoWPAN domain is maintained by SMAG (Sensor Mobile Access Gateway), and then is performed the route optimization quickly. The status information of the route optimization from SPIG is stored to SLMA and it is supported without additional signaling.