• The Journal of the Korea Contents Association
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• v.10 no.11
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• pp.146-153
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• 2010

With the advent of new media richness of technology in the digital age has transformed our lives. The development of technology, the more our lives more convenient, new, future-oriented, while expectations for the digital age, people are longing for warm, human sensibility became. Of modernism and post-modernism appeared to reflect the proliferation of digital media in culture, wandering through the complex has been diversifying. In the digital age stabilizing psychological or mental needs of people who want to begin to emerge as the disfunctional aspects of the digital age has been suggested for the problem. To respond to human emotion on the emotional reaction of users to consider the analog emotional design began to emerge. The analog to digital media to express emotions practical approach to the problem should be attempted. Analog in a digital environment, emotional nature of the digital technology and communication, and symbolic and emotional aspects of people as announced to blend the new extension, change, and an analog emotional design for the evolution and development of new possibilities to investigate the castle.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.6
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• pp.15-21
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• 2011

Cooperative diversity system can be applied to an ad-hoc network for reduction of the power consumption, for expansion of the communication range, and for improving the system performance. In a selection relay cooperative diversity system which selects the maximal SNR(Signal-to-noise ratio) relay for transmitting the source information, the selected strong relay transmits continuously under slow fading channel, consequently it reduces the network lifetime. To overcome this defect, recently the uniform power relay selection has been studied to expand the network life time. We apply the uniform power relay selection to a DOT(Double opportunistic transmit) cooperative system that select the transmit relays, of which the SNR of the transmit relays exceed both of the source-relay and the relay-destination threshold. And the performance of the system is analytically derived. The performance comparisons are made among SC(Selection combining), MRC(Maximal ratio combining), and uniform power relay selection of the cooperative diversity system. We noticed that the performance of the uniform power relay selection is inferior to that of others. It is interpreted that the uniform transmit opportunity to the selected relays for extension of the network lifetime degrades the performance.

• Journal of Digital Convergence
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• v.14 no.8
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• pp.269-276
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• 2016

Public Safty-LTE(Long Term Evolution) is being deployed in the direction of reducing cost by using both of municipal network and commercial network. However, LTE Network is difficult to ensure the survivability during the information communication infrastructure failures. In addition, it is vulnerable in communication coverage of inside buildings and underground. In this study, we propose to implement effectively the network survivability technique through the convergence to the proven technology. As the advent of the IoT Age, smart sensors which are embedded in the environment and the things will be able to provide a useful infrastructure for ensuring the network survivability. Based on the feature of the smart sensor, we designed the sink node architecture to guarantee the network survivability in disaster situation through the convergence of the small cell technology and extension of wireless network coverage technology. The computing power inherent in the environment is a valuable resource that can be utilized in the disaster situation.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.3
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• pp.25-33
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• 2015

As a reversible Jacket is having the compatibility of two sided wearing, the matrix that both the inside and the outside are compatible is called Jacket matrix, and the matrix is having both inside and outside by the processes of element-wise inverse and block-wise inverse. This concept had been completed by one of the authors Moon Ho Lee in 1989, and finally that resultant matrix has been christened as Jacket matrix, in 2000. This is the most generalized extension of the well known Hadamard matrices, which includes both orthogonal and non-orthogonal matrices. This matrix addresses many problems in information and communication theories. we investigate the properties of the Jacket matrix, i.e. determinants, eigenvalues, and kronecker product. These computations are very useful for signal processing and orthogonal codes design. In our proposal, we provide some results to calculate these values by using a very simple mathematical model with less complexity.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.2
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• pp.367-372
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• 2017

LED illumination has been developed from simple illumination to human oriented multi-functional system depending on the IT convergence trends. Thus, the convergence of IT technology such as various types of sensor and communication functions with application software can make saving of energy, and there are also several needs about the tailor-made illuminations requirements for the diverse users who want to take their own colors, strengths of the light. For the adaption of these kinds of intelligent system illumination, user oriented sensor and control should be possible. The LED lighting control system transmits and receives data via the Bluetooth mesh network and provides functions such as LED lighting control, LED lighting condition monitoring, energy usage monitoring, and energy peak point management. Therefore, in this paper, we suggest wireless communication platform and control system for the LED illumination control. We can expect life extension of LED illumination, and energy saving through this suggested system.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.13 no.5
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• pp.2338-2356
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• 2019

Vehicular ad-hoc network (VANET) is the name of technology, which uses 'mobile internet' to facilitate communication between vehicles. The aim is to ensure road safety and achieve secure communication. Therefore, the reliability of this type of networks is a serious concern. The reliability of VANET is dependent upon proper communication between vehicles within a given amount of time. Therefore a new formula is introduced, the terms of the new formula correspond 1 by 1 to a class special ST route (SRORT). The new formula terms are much lesser than the Inclusion-Exclusion principle. An algorithm for the Source-to-Terminal reliability was presented, the algorithm produced Source-to-Terminal reliability or computed a Source-to-Terminal reliability expression by calculating a class of special networks of the given network. Since the architecture of this class of networks which need to be computed was comparatively trivial, the performance of the new algorithm was superior to the Inclusion-Exclusion principle. Also, we introduce a mobility metric called universal speed factor (USF) which is the extension of the existing speed factor, that suppose same speed of all vehicles at every time. The USF describes an exact relation between the relative speed of consecutive vehicles and the headway distance. The connectivity of vehicles in different mobile situations is analyzed using USF i.e., slow mobility connectivity, static connectivity, and high mobility connectivity. It is observed that $p_c$ probability of connectivity is directly proportional to the mean speed ${\mu}_{\nu}$ till specified threshold ${\mu}_{\tau}$, and decreases after ${\mu}_{\tau}$. Finally, the congested network is connected strongly as compared to the sparse network as shown in the simulation results.

• The Journal of the Korea Contents Association
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• v.15 no.7
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• pp.30-42
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• 2015

In this paper, we propose a new skyline query processing scheme to enhance accuracy of query processing and communication cost in mobile P2P environments. The proposed scheme consists of three stages such as the pre-skyline processing, the query transmission range extension policy, and the continuous skyline query processing. In the pre-skyline processing, a peer selects the candidate filtering objects who have the potential to be selected. By doing so, the proposed scheme reduces the filtering cost when processing the query. In the query transmission range extension policy, we have improved the accuracy by extending the query transmission range. In addition, it can handle continuous skyline query by performing the monitoring after the first skyline query processing. In order to show the superiority of the proposed method, we compare it with the existing schemes through performance evaluation. As a result, it was shown that the proposed scheme outperforms the existing schemes.

• Journal of Agricultural Extension & Community Development
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• v.8 no.2
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• pp.159-177
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• 2001

This research aims to clarify what kind of competencies are the source of the competitiveness of an enterprise and the standards for the development of human resources. Its specific objectives are the following; First, to develop methods for examining competencies to carry out one’s job. Second, to draw out the competencies necessary for carrying out the jobs by jobs on the basis of the developed methods. Third, to clarify the competencies commonly needed to carry out all kinds of jobs. This study collected materials for drawing out the competencies needed to perform 21 jobs in six job groups. This was done with the help of a panel of professionals. The process for drawing out the competencies required to perform certain job was designed in six steps. These steps combine classical methods using particular reference groups as well as model methods for particular job competencies. The materials for the R&D job were gathered for three months starting from February 2001. Materials from 20 other jobs were also collected three times from the end of May to the end of October 2001. This was done through workshops with professional groups. The highlights of this study are as follows: 1) The results applying the methods developed for drawing out job competencies to the duties of investigation & research part in R&D job were presented as an example. 2) The job competencies of the company totaled 215 in 21 jobs irrespective of overlapping, which means each job has about 10 competencies on the average. 3) The common job competencies of the whole company totaled eight. namely: competency for collecting information/processing/analyzing, communication competency, presentation competency, competency for utilizing the web, competency for planning projects, competency for solving problems, competency for understanding organization/business/products of the company, and competency for satisfying customers.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.9
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• pp.5790-5795
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• 2014

Elliptic curve cryptography (ECC) is an extremely important part of information protection systems because it has outstanding safety among public key encryption algorithms. On the other hand, as ECC cannot obtain accurate values using a real number field because of the slow calculation and errors from rounding off, studies of ECC have focused on a finite field. If ECC can be extended to the real number field, more diverse keys can be selected compared to ECC only based on a finite field. Accordingly, in this paper, a method for constructing a cryptographic system with a high degree of safety is proposed through the diversification of keys selected by the user based on the operant extension method instead of extracting keys only using integer values.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.5
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• pp.925-933
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• 2003

Network is expected to be developed into optical Internet network collected IP layer and optical layer, but GMPLS is risen at the transitional evolution stage because of the present technology level. GMPLS that MPLS is extended and generalized is able to support not only the packet switching device but also the devices which perform switching in time, wavelength, and space domain. To implement the common control plane to these various switching types, GMPLS extends the existing MPLS signaling and routing protocol. In this paper, we describe the overview of GMPLS technology, and then we will refer to the OSPF(Open Shortest Path First), which was used to exchange the status information of link, as the plan of routing extension to exchange the information of various link type, bandwidth, link protection type etc. And also, we describe the definition of new protocol, so called, LMP that is a signaling protocol for solving complex problem which manages hundreds and thousands of links between two nodes. And we will examine and analyze the plan of signaling protocol extension to apply signaling protocol RSVP-TE(Resource Reservation Protocol) for traffic engineering in MPLS to network, and the message objects and formats associated with modified RSVP.