• Journal of the Korea Institute of Information and Communication Engineering
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• 제20권5호
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• pp.949-956
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• 2016

By recent development of wired and wireless communication technology, any service can be delivered through broadcasting networks or communication networks. So contents consumers want to receive broadcasting program via any accessible network. Network independent broadcasting system can receive optimized multimedia contents by combining the high-quality multimedia contents transmitted through broadcasting network and the additional contents delivered through communication network. Additional contents can be other multimedia contents, URL of contents, some texts for indicating information of received multimedia, etc. Network independent broadcasting system is in early stage of development, and receivers and the monitoring system for hybrid broadcast are under development. Thus the multiplexing method and demultiplexing method to perform hybrid broadcasting is on study. In this paper, we designed the demultiplexing algorithm to perform hybrid broadcasting system and implemented demultiplexer system based on modulator interface system standard T2-MI of DVB-T2.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• 제16권11호
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• pp.1147-1154
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• 2005

In this paper, we propose some PAPR(Peak to Average Power Ratio) reduction methods using WHT(Walsh Hadamard Transform) to reduce high PAPR generated in OFDM system because of multi carrier modulation. These proposed methods are the methods which has additional PAPR reduction performance without a loss of bandwidth efficiency and a large increment of calculation complexity than common PAPR reduction methods by combining the WHT with some common methods. In this paper, we propose two PAPR reduction methods made by combining a SLM(Selective Mapping) and DSI(Dummy Sequence Insertion) with a WHT. From simulation result, we can find that the PAPR reduction methods using a WHT can get about 1 dB additional PAPR reduction performance than common PAPR reduction methods; they are SLM and DSI. And, because our proposed methods have not only PAPR reduction effect, but also frequency diversity effect, more stabile data transmission is possible in nonlinear HPA and multipath fading channel.

• Journal of Korea Society of Industrial Information Systems
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• 제23권4호
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• pp.93-105
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• 2018

For some consumer goods, consumers expect additional benefits or returns after purchasing or using them. This kind of consumer goods that consumers expect some additional benefits or returns after consumption (hereafter consumer goods of investment or CGOI) need not only an approach of simple purchasing perspective but also an approach from investment perspective. Current study tries to figure out if consumers react differently in their purchasing intentions toward CGOI between when they focus on the product's quality, functions, or other current state related information (i.e., simple purchase focus) and when they focus on the benefits that will be generated after using the product (i.e., investment focus). According to the results, while consumers' purchasing intentions toward CGOI in the investment mode are greater when the price is low than when the price is high, consumers' purchasing intentions toward CGOI in the simple purchasing mode are greater when the price is hgih than when the price is low.

• The KIPS Transactions:PartC
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• 제10C권6호
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• pp.675-682
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• 2003

Attackers collect vulnerabilities of a target computer system to intrude into it. And using several attack methods, they acquire root privilege. They steal and alter information in the computer system, or destroy the computer sysem. So far many intrusion detection systems and firewallshave been developed, but recently attackers go round these systems and intrude into a computer system . In this paper, we propose security kernel module to prevent attackers having acquired root privilege from doing illegal behaviors. It enhances administrator authentication with additional password, so prevents attackers from doing illegal behaviors such as modification of important files and installation of rootkits. It sends warning mail about sttacker's illegal behaviors to administrators by real time. So using information in the mail, they can estabilish new security policies.

• Journal of the Society of Disaster Information
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• 제10권2호
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• pp.220-228
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• 2014

A stalking is becoming more diverse and the methods are developing over time as the society has changed over time due to the advancement of information technology but an initial countermeasure seems to be difficult as there is no sufficient legislations against such crimes as stalking. Our country passed laws regulating such stalking at 1999 and four more additional bills were proposed until the 18th National Assembly but they failed to become legalized. Two more additional bills were proposed during 19th National Assembly which are still pending. Crimes such as stalking violates and invades physical and psychological freedom of the victims and the crimes are severely inveterate and intentional. Advanced countries such as the United States, the Great Britain, Germany, and Japan enacted legislations that strictly regulates stalking and also appropriate responses. As these exemplary cases show, it is essential that our country also requires an effective legislations against crime of stalking and protecting a victim of the crime.

• Journal of the Korea Society of Computer and Information
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• 제18권11호
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• pp.107-113
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• 2013

Mobile mobility and data reliability should be guaranteed as well as amounts of data services are essential in the era of smart media. In order to improve the reliability of high-speed data, strong channel coding and modulation techniques are required. In this paper, the structure of Turbo TCM decoder, applying high-order modulation techniques and the DPSAM method which improves performances in time-selective fading channels in the case of burst errors are suggested through the optimal decoding method and iteration decoding so as to improve bandwidth efficiency in Turbo Codes with excellent encoding gain. The proposed method in comparison with the existing method is that 3dB is superior in case that BER is $10^{-2}$ and the number of iterations is 3. In addition, the function is improved at approximately 6dB in case that BER is $10^{-3}$ and the number of iterations is 7. The proposed method requires additional bandwidth; however, the bandwidth loss can be overcome through Turbo TCM technology on the additional bit rate from the bandwidth loss.

• Journal of Korean Society of Archives and Records Management
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• 제19권1호
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• pp.195-224
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• 2019

Online service has been emphasized in various studies for content uses and diffusion of cultural heritage domain. This study purports to investigate the status of contents organization and information services for online cultural heritage services and to suggest improvement directions. This study conducted case studies and expert interviews based on contents, search systems, additional services, and expansion services. It also suggested an integrated information retrieval service for cultural heritage contents as well as the provision of high-quality content and various types of contents. The flexibility of the search function through the content hierarchy, the expansion of access points through the construction of controlled vocabulary, and authority data were also focused. As an additional service, the study proposed a curation-based, user-customized service, data sets open and share, and user participation.

• Journal of Korean society of Dental Hygiene
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• 제19권4호
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• pp.601-614
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• 2019

Objectives: The purpose of this study was to investigate the present conditions and problems of oral health care in senior citizens with dementia using a qualitative research method, through focused group interviews. Methods: Data was collected for approximately one month from May 2019. The subjects were divided into two groups: care workers and family caregivers. Fifteen participants were included in the study. Results: In-depth interviews with the care workers revealed the following three categories: characteristics of senile dementia patients, oral health care in senile dementia patients, and oral health care education. In-depth interviews with the family caregivers revealed the following four categories: characteristics of senile dementia patients, oral health care in senile dementia patients, oral health care education, and burden of care. The central themes common to both the care workers and family caregivers were the challenges owing to the characteristics of senile dementia patients, poor health condition of the senile dementia patients, difficulty in oral health care of the senile dementia patients, the desire to receive oral health care education and related information, and to access the information more easily. Additional central themes specific to the care workers were, the applicability of the intervention programs, variability between the facilities, and the problems of oral health care education. An additional central theme specific to the family caregivers was the burden of care. Conclusions: It is necessary to provide oral health care education and information to care workers and family caregivers of senile dementia patients, and to manage and support the dental health professionals ready to care for senile dementia patients. In addition, support to the family caregivers should not be limited only to the financial aspects, but also consider the psychological and emotional difficulties.

• Journal of the Korea Institute of Information and Communication Engineering
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• 제26권8호
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• pp.1142-1147
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• 2022

The edges of image should be detected first so that the objects in the image can be identified. An hardware-implemented edge detection algorithm outperforms its software version. Sobel operation is the most suitable algorithm for an hardware implementation of edge detection. And lots of works have been done to perform Sobel operations efficiently on FPGA-based hardware. This work proposes how to implement fast edge detection circuit on FPGA, which is based on the conventional circuit for edge detection using Sobel operator. The newly proposed circuit is suitable for processing images when the images are stored in memory devices and outperforms the conventional one with little additional FPGA resources. Both the conventional circuit and the proposed circuit were implemented on an FPGA. And the result showed that the proposed circuit almost doubles the performance in processing images and needs little additional FPGA resources.

• Journal of the Korean Geotechnical Society
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• 제22권2호
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• pp.55-68
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• 2006

For the reliable prediction of spatial geotechnical data, a procedure to build the Geotechnical Information System (GTIS) based on geo-knowledge within the frame of GIS technology was developed by introducing a couple of new concepts of the extended area containing the study area and the additional site visit for acquiring surface geological data. To build the GTIS for Gyeongju as the case study of regional model application, intensive site investigations and pre-existing geotechnical data collections were performed and additional site visit was also carried out for acquiring surface geo-layer data in accordance with the developed procedure. Within the GTIS based on geo-knowledge for Gyeongiu area, the spatially distributed geo-layers across the extended area were predicted using the geostatistical kriging method and those for the study area were extracted. Furthermore, the spatial distribution maps for the thickess of geo-layers and the depth to bedrock were constructed for the practical use in geotechnical field. It was evaluated that the GTIS based on geo-knowledge developed in this study is superior to the conventional geotechnical GIS in terms of both the standard deviation and the geological expert judgment.