• Journal of Digital Contents Society
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• v.12 no.1
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• pp.85-94
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• 2011

QoS(Quality of Service) is defined as "The collective effect of service performance which determines the degree of satisfaction of a user of the service" by ITU-T Rec. E.800. While the use of VoIP(Voice Over Internet Protocol) has been widely implemented, persistent problems with QoS are a very important sue which needs to be solved. This research is finding the assignment of VoIP QoS to deduct how to manage the control system and presenting the QoS control process and framework under NGN(Next Generation Network) environment. The trial framework is the modeling of the QoS measurement metrics, instrument, equipment, method of measurement, the series of cycle & the methodology about analysis of the result of measurement. This research underlines that the vulnerability of the VoIP protocol in relation to its QoS can be guaranteed when the product quality and management are controlled and measured systematically. Especially it's very important time to maintain the research about VoIP QoS measurement and control because the big conversion of new network technology paradigm is now spreading. In addition, when the proposed method is applied, it can reduce an overall delay and can contribute to improved service quality, in relation to signal, voice processing, filtering more effectively.

• Journal of the Korea Society of Computer and Information
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• v.13 no.6
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• pp.13-24
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• 2008

The multi robot operation technique has emerged as one of the most important research subjects that focus on minimizing redundancy in space exploration and maximizing the efficiency of operation. For an efficient operation of the multi robot systems, the movement of each Single robot in the multi robot systems should be properly observed and controlled. This paper suggests Multi Robot Management System to minimize redundancy in space exploration by assigning exploration space to each robot efficiently to take advantage of the RFID. Also, this paper has suggested fault tolerance technique that detects disable Single robot and substitute it by activated Single robot in order to ensure overall exploration and improve efficiency of exploration. Proposed system overcomes previous fault that it is difficult for central server to detect exact position of robot by using RFID system and Home Robot. Designated Home robot manages each Single robot efficiently and assigns the best suited space to Single robot by using RFID Tag Information. Proposed multi robot management system uses RFID for space assignment, Localization and Mapping efficiently and not only maximizes the efficiency of operation, but also ensures reliability by supporting fault-tolerance, compared with Single robot system. Also, through simulation, this paper proves efficiency of spending time and redundancy rates between multi robot management applied by proposed system and not applied by proposed system.

• Journal of Digital Contents Society
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• v.15 no.6
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• pp.663-673
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• 2014

The WBAN technology means a short distance wireless network which provides each device interactive communication by connecting devices inside and outside of body. Standardization on the physical layer, data link layer, network layer and application layer is in progress by IEEE 802.15.6 TG BAN. Wireless body area network is usually configured in energy efficient using sensor and zigbee device due to the power limitation and the characteristics of human body. Wireless sensor network consist of sensor field and sink node. Sensor field are composed a lot of sensor node and sink node collect sensing data. Wireless sensor network has capacity of the self constitution by protocol where placed in large area without fixed position. In this paper, we proposed the efficient addressing scheme for improving the performance of routing algorithm by using ZigBee in WBAN environment. A distributed address allocation scheme used an existing algorithm that has wasted in address space. Therefore proposing x, y and z coordinate axes from divided address space of 16 bit to solve this problems. Each node was reduced not only bitwise but also multi hop using the coordinate axes while routing than Cskip algorithm. I compared the performance between the standard and the proposed mechanism through the numerical analysis. Simulation verified performance about decrease averaging multi hop count that compare proposing algorithm and another. The numerical analysis results show that proposed algorithm reduced the multi hop better than ZigBee distributed address assignment

• Journal of the Korean Society of Hazard Mitigation
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• v.9 no.3
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• pp.75-79
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• 2009

The purposes of this study were to find out the factors affecting the continuous participation of volunteer activities for disaster relief and to provide implications for the efficient management of sustainable disaster relief volunteer activities. In order to achieve these purposes, we investigated how much individual characteristics, the volunteer attitude and motivation, and institutional characteristics, respectively, affect the duration of disaster relief volunteer activities. The research was carried out targeting 261 disaster relief volunteer workers, aged over 20, who affiliated to various volunteer centers. Data were collected by survey methodology from May 7th to May 27th, 2008. A frequency analysis and a multiple regression were utilized for analyzing data. The results of this study were as follows: the continuity of volunteer activities of the subjects are likely to be high when they are older, have a job, are highly motivated, are assigned properly to the placement and task. Based on the results of this study, some practical implications were suggested. First, since placement and task assignment managed by volunteer organizations are very important for the continuity of volunteer activities, those organizations should have developed diverse volunteer activity programs considering volunteers' characteristics and interest. Second, the managers of those organizations need to sufficiently consider the characteristics of volunteers such as age and job when dispatching volunteers in disaster areas. The managers should help their volunteers to immerse in their volunteer work. Finally, it is necessary to induce social concern and support in disaster relief volunteer activities in order to make volunteers especially with jobs be constantly active in disaster relief activities.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.14 no.6
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• pp.37-49
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• 2015

In Space Syntax, the greater the degree of integration between separate links, the greater the links' accessibility from the target network. As such, planning pedestrian walks so that links with high degrees of integration are connected, or else inducing high integration value land use are both valid options. The travel distribution model reflects how walking demand, or more specifically, the pedestrian, partakes in route choosing behavior that minimizes select criteria, notably level of discomfort, as measured using travel distance and time. The model thus demonstrates travel patterns associated with demand pertaining to minimization of discomfort experienced by the pedestrian. This research introduces a method that integrates Space Syntax and the pedestrian travel distribution model. The integrated model will determine whether regions with high degrees of integration are actually being used as pivots for pedestrian demand movement, as well as to explain whether the degree of integration is sustained at an appropriate level while considering actual movement demand. As a means to develop the integrated model, a method that combines display of the visibility of the space syntax network and road-divided links is proposed. The pedestrian travel distribution model also includes an alternative path finding mechanism between origin and destination, which allows for uniform allocation of demand.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.6
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• pp.187-193
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• 2015

The ICT healing platform sets a couple of goals including preventing chronic diseases and sending out early disease warnings based on personal information such as bio-signals and life habits. The 2-step open system(TOS) had a relay designed between the healing platform and the storage of personal health data. It also took into account a publish/subscribe(pub/sub) service based on large-scale connections to transmit(monitor) the data processing process in real time. In the early design of TOS pub/sub, however, the same buffers were allocated regardless of connection idling and type of message in order to encode connection messages into a deflate algorithm. Proposed in this study, the dynamic buffer allocation was performed as follows: the message transmission type of each connection was first put to queuing; each queue was extracted for its feature, computed, and converted into vector through tf-idf, then being entered into a k-means cluster and forming a cluster; connections categorized under a certain cluster would re-allocate the resources according to the resource table of the cluster; the centroid of each cluster would select a queuing pattern to represent the cluster in advance and present it as a resource reference table(encoding efficiency by the buffer sizes); and the proposed design would perform trade-off between the calculation resources and the network bandwidth for cluster and feature calculations to efficiently allocate the encoding buffer resources of TOS to the network connections, thus contributing to the increased tps(number of real-time data processing and monitoring connections per unit hour) of TOS.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.2 no.1
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• pp.87-101
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• 1995

This study was conducted with the subject of showing the importance of early rehabilitation and exercise therapy in patients who have stroke, of confirming the adavntage of ward exercise conducted by nurse, which had been conducted mainly by physical therapist only in physical thrapy room and of developing the exercise program as the independent rehabilitation nursing intervention. A total of 62 patients were selected as object from April, 5th, to May, 17th, 1995, who had been hospitalized in K medical center, and the half of them were assigned to Experimental group in ramdom assignment using a coin. It was ADL check list tool developed by Kang and Ward Exercise Program developed by the researcher that were used as a treatment. Ward Exercise Program was conducted by the reseacher and the physical therapist measured ADL score before and after Ward Exercise Program. The data were analyzed using ANOVA, pearson correlation, Chi-Square test and the effect of Ward Exercise Program was analyzed by t-tast. The result of this study is as follows. 1. The experimental group showed eminent improvement of ADL compared with the counter group with statistical significance. In eating(t=6.10, df=60, p=.000), personal hygiene performing(t=4.86, df=60, p=.000), wearing(t=5.86, df=60, p=.000), elimination(t=7.89, df=60, p=.000), mobility on the bed(t=13.36, df=60, p=.000), moving(t=9.11, df=60, p=.000), walking(t=7.45, df=60, p=.000) 2. There was no qualitative difference between experimental group and control group with the significance of $p{\le}.05$. 3. There was no relation between the general condition and the difference of ADL, while there was significant relation between the starting point of exercise and the difference of pre-exercise and post exercise ADL. As a result, it should be emphasized that the early rehabilitation and exercise therapy are important in patients who have stroke, and that it is necessary to extend the exercise therapy to the ward. Therefore, this Ward Exercise Program could be recommended as a independent clinical exercise nursing intervention in rehabilitation nursing of patients who have stroke.

• Journal of the Korean Association of Geographic Information Studies
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• v.18 no.3
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• pp.76-88
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• 2015

This paper presents a classification method based on the combination of active learning with temporal contextual information extracted from past land-cover maps for the classification of crop cultivation areas. Iterative classification based on active learning is designed to extract reliable training data and cultivation rules from past land-cover maps are quantified as temporal contextual information to be used for not only assignment of training data but also relaxation of spectral ambiguity. To evaluate the applicability of the classification method proposed in this paper, a case study with MODIS time-series vegetation index data sets and past cropland data layers(CDLs) is carried out for the classification of corn and soybean in Illinois state, USA. Iterative classification based on active learning could reduce misclassification both between corn and soybean and between other crops and non crops. The combination of temporal contextual information also reduced the over-estimation results in major crops and led to the best classification accuracy. Thus, these case study results confirm that the proposed classification method can be effectively applied for crop cultivation areas where it is not easy to collect the sufficient number of reliable training data.

• Journal of Korean Society of Archives and Records Management
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• v.11 no.2
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• pp.95-119
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• 2011

Managing and preserving parliamentary archives are significant national tasks. However, in South Korea significance of these tasks have not been recognized. The first exclusive organization for parliamentary archives management was established in 2000, It took about 50 years after the first South Korean government was established in 1948. The first legislation which regulated parliamentary archives management was enacted in 2001. There were no significant improvement on the regulation for the last decade. In April 2011 it was newly revised according to the amendment of the Act on Public Records Management. In this context this study critically analyzes the regulation and discusses various issues concerning the parliamentary archives management system. It divides the history of parliamentary archives management into four periods. It also explores four contentious issues ranging from parliamentary archive designation to archivists assignment. As a result, the study presents four different aspects for developing parliamentary archives management Each aspect proposes three different phased problems respectively. Keywords: national assembly records management regulation, national assembly archives,

• Journal of the Korea Concrete Institute
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• v.14 no.3
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• pp.307-314
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• 2002

Utilization of demolished-concrete as recycled aggregate has been researched for the purpose of substituting for insufficient natural aggregate, saving resources and protecting environment. There, however, are some Problems not only the large difference of dualities in recycled aggregates but also a little deterioration of mechanical properties in recycled aggregate concrete in comparison with that of natural aggregate concrete. In this study, the test results of freez and thaw durability of concrete with demolished-concrete recycled aggregate(DRA) arc as follows. Improvement of crushing process is an important assignment because that adhered mortar on source-concrete recycled aggregate(SRA) and DRA highly affects thc qualifies of recycled aggregate. The compressive strength of recycled aggregate concrete was not highly different in comparison with that of control concrete. But the resistance to penetration of Cl in recycled aggregate concrete was shown smaller than that of control concrete because of adhered mortar on recycled aggregate. The resistance to frcezing and thawing of recycled aggregate concrete was highly different due to adhered mortar on recycled aggregate, and durability factor of concrete with NA-SRA and DRA was more decreased than that of control concrete. On the other hand, durability factor of concrete with AA-SRA was larger than that of control concrete. It, therefore, is necessarily required that recycled aggregate including adequate entrained air should be used for satisfying the freez and thaw durability of recycled aggregate concrete.