• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.9 no.5
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• pp.451-457
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• 2016

To improve security in the data communication field, many studies on the application of chaotic signals to encryption have been conducted in recent years. In this study, a new security protocol where the initial value sensitivity and noise similarity of chaotic signals have been applied to an RFID communication channel was designed. In the case of chaotic systems, if the initial values become identical, the same signals are generated at the same time after that point even though the two systems have been calculated independently. Therefore, an unpredictable security channel can be produced based on such characteristics. However, a security channel can be produced only when an initial value is shared in advance, and thus there is a potential problem of infringement during the transmission of the initial value. To resolve this problem, a method in which a certain proportion of new chaotic signals are applied to two chaotic systems for communication and are then synchronized after some time was proposed. This new method can conceal the initial value, and thus can resolve the problem of the existing communication method using chaotic signals. The designed method was verified with the encryption and decryption of images. It is expected that a more secure RFID system could be established by applying the communication protocol proposed in this study to insecure RFID communication channels.

• Journal of Food Hygiene and Safety
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• v.31 no.6
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• pp.420-425
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• 2016

The present study aimed to calcium (Ca), iron (Fe) and zinc (Zn) contents were compared with reference values indicated on the nutrition label of nutrition emphasized food. Also, this paper will briefly review and evaluate what is currently known about Fe-Zn and Ca-Fe interaction. Ca, Fe or Zn-emphasized product, including cereal, snack, soy milk, chocolate product, other cocoa product, sugars product, beverage and tea were analyzed. The contents of Ca, Fe, and Zn in samples after dry-ashing were examined by ICP. The measured Ca (n = 42), Fe (n = 13), Zn (n = 6) values were ranged 87~176%, 98~167%, 98~275% of reference value indicated product, respectively. All samples were ranged more than 80% of the reference value, which were complied with food regulation. High intake of Ca has been shown to adversely affect Fe absorption and the negative effect of Fe on Zn absorption is well known. Therefore, it is important to consider Ca-Fe and Fe-Zn absorption interaction, when Ca, Fe or Zn-emphasized product produce and nutrition labeling policy should be managed regularly with continuous monitoring.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.10 no.3
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• pp.213-219
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• 2017

Recently, the Internet Protocol Television (IPTV) services have become very common, enabling various Internet-based services as well as watching TV. In the IPTV system, a Set-Top box (STB) plays a key role as a network terminal device that transmits and receives realtime multimedia contents. In addition, the IPTV networks are usually supported by broadband optical fiber-base network such as fiber-to-the-home (FTTH), However, a general IPTV STB is regarded as one of the local area network (LAN)-attached devices while sharing the bandwidth of the LAN (e.g., Ethernet). In order to overcome the limited bandwidth utilization by fully facilitating the broadband bandwidth (e.g., 1 Gbps) of the optical fiber-based network, we propose a new FC (Fiber Channel)-embedded IPTV STB which can be directly attached to the optical fiber network. Then, we verify that the impacts of the proposed FC-embedded IPTV STB by organizing the the FC-AL (Fiber Channel-Arbitration Loop) network equipped with the FC-embedded IPTV We measures the average Start-up Delay, Average Reject Ratio and the Number of Concurrent Users through extensive simulations to investigate the performances of the suggested FC-AL-based IPTV network. Surprisingly, the IPTV network architecture with the proposed FC-embedded IPTV STBs has an excellent average start-up delay of less than 10 msec, an acceptable average reject ratio of less than 3 % as well as a linear increase of the number of concurrent users when extending the architecture. This reveals that the proposed FC embedded STB has a superior impacts on the performance of the entire IPTV network by effectively utilizing the broadband bandwidth of the fiber optic-based network.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.2
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• pp.259-267
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• 2020

This study investigates the educational needs of parents of elementary school children, who use smartphones for emergencies. This is a descriptive cross-sectional study, and data of 200 parents of students under the 6th grade was collected from October 17 to 27, 2017. The study results indicate that 67.5% parents visited the emergency department due to a child's emergency accident. Of these, 74% respondents replied that they were unaware of how to deal with the emergency at that instance. Most parents had never received education, and were using smart-phones to acquire information on first aid. Ed. Notes: Do you mean education in general (i.e. Most parents were uneducated) or do you mean 'education for emergencies'? Please revise for more clarity. Parents' demand for education on child emergency response scored high, with an average of 3.40 (±0.42) out of 4 points. Among the educational categories, "the management of foreign body airway obstruction and cardiopulmonary resuscitation (CPR)" scored the highest average for educational needs (3.64±0.52). This research provides baseline information for understanding the educational needs of parents for first aid for the child. Our findings indicate that the smartphone is potentially an effective educational tool for parents.

• Journal of Satellite, Information and Communications
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• v.3 no.1
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• pp.48-54
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• 2008

With the increasing events of natural disasters caused by unpredictable atmospheric movements, the importance of weather forecasting is increasingly emphasized. In this paper, we adopt satellite radar imageries to deal with unusual weather events over Korean region including yellow sand that swept over Korea in spring 2007 and typhoon EWNIAR in 2006. Korea has suffered from these natural events with increasing frequencies over last decades and the satellite radar imaging is considered the most appropriate method to track and analyze the characteristics of the events spanning from mainland China to Japan. The yellow sand mostly comes from Manju area in China and consists of tiny particles so that they move with high speed resulting in difficulty in predicting their moving paths. With the use of various radar images taken at regular time intervals, we could possibly derive the expected movement of the yellow sand particles. In the future, with the help of radar images taken at very short intervals, satellite radar image analysis will become a very useful tool to predict and prepare for the natural disastrous events caused by abrupt change in the atmosphere and deserts around Korea.

• Journal of KIISE:Databases
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• v.36 no.4
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• pp.263-279
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• 2009

Shape features in a content-based image retrieval (CBIR) system are divided into two classes: contour-based and region-based. Contour-based shape features are simple but they are not as efficient as region-based shape features. Most systems using the region-based shape feature have to extract the region firs t. The prior works on region-based systems still have shortcomings. They are complex to implement, particularly with respect to region extraction, and do not sufficiently use the spatial relationship between regions in the distance model In this paper, a region extraction method that is the combination of an edge-based method and a region growing method is proposed to accurately extract regions inside an object. Edges inside an object are accurately detected based on the Canny edge detector and the Hough transform. And the modified Integrated Region Matching (IRM) scheme which includes the adjacency relationship of regions is also proposed. It is used to compute the distance between images for the similarity search using shape features. The experimental results show the effectiveness of our region extraction method as well as the modified IRM. In comparison with other works, it is shown that the new region extraction method outperforms others.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.5
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• pp.327-336
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• 2020

This study was undertaken to identify ways that enable a successful comeback to everyday life and improvement in the quality of life, by understanding the experiences of cancer survivors in returning to everyday life. Totally, 19 people diagnosed with complete cure after 5 years of cancer treatment, were recruited for the study. Data was collected through in-depth interviews from January 18 to February 25, 2017. One-time interviews took 90 to 120 minutes, and data analysis was achieved by applying the grounded theory. The central phenomenon of 'reality that cannot be escaped' and 'uncertain reality that cannot know tomorrow' was attributed to the causal conditions 'hard reality', 'physical exhaustion', 'psychological exhaustion' and 'economic exhaustion'. Depending on context conditions such as 'lack of family support', 'shift to a vulnerable working class', 'insufficient support system', 'hope for the societal support system', 'daunted gender', 'prejudice against cancer/cancer patients', 'information on life after rare full healing'. The strategy for a successful return was influenced by intervention conditions such as 'robust family fence' and 'effective cancer insurance', which resulted in 'building a new life' or 'enduring'. We conclude that for a successful return to daily lives, cancer survivors require comprehensive information, health and social-welfare interventions.

• Journal of KIISE
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• v.44 no.8
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• pp.813-821
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• 2017

Entity Linking find the meaning of an entity mention, which indicate the entity using different expressions, in a user's query by linking the entity mention and the entity in the knowledge base. This task has four challenges, including the difficult knowledge base construction problem, multiple presentation of the entity mention, ambiguity of entity linking, and NIL entity recognition. In this paper, we first construct the entity name dictionary based on Wikipedia to build a knowledge base and solve the multiple presentation problem. We then propose various methods for NIL entity recognition and solve the ambiguity of entity linking by training the support vector machine based on several features, including the similarity of the context, semantic relevance, clue word score, named entity type similarity of the mansion, entity name matching score, and object popularity score. We sequentially use the proposed two methods based on the constructed knowledge base, to obtain the good performance in the entity linking. In the result of the experiment, our system achieved 83.66% and 90.81% F1 score, which is the performance of the NIL entity recognition to solve the ambiguity of the entity linking.

• Journal of KIISE:Software and Applications
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• v.34 no.9
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• pp.828-847
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• 2007

In this paper we propose a formal data model of an object-based thesaurus system supporting multi-dimensional facets. According to facets reflecting on respective user perspectives, it supports systematic construction, browsing, navigating and referencing of thesauri. Unlike other faceted thesaurus systems, it systematically manages its complexity by appropriately ing sophisticated conceptual structure through visualized browsing and navigation as well as construction. The browsing and navigation is performed by dynamically generating multi-dimensional virtual thesaurus hierarchies called "faceted thesaurus hierarchies." The hierarchies are automatically constructed by combining facets, each representing a dimension of view. Such automatic construction may make it possible the flexible extension of thesauri for they can be easily upgraded by pure insertion or deletion of facets. With a well defined set of self-referential queries, the thesauri can also be effectively referenced from multiple view points since they are structured by appropriately interpreting the semantics of instances based on facets. In this paper, we first formalize the underlying model and then implement its prototype to demonstrate its feasibility.

• Environmental and Resource Economics Review
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• v.16 no.1
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• pp.65-98
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• 2007

Wetland provides various environmental services as well as marketable goods to human society. This paper presents a meta-analysis of the wetland valuation studies conducted in Korea during the past decade. Meta-analysis is a technique of summarizing research results from the separate but related studies using statistical methods. The objectives of the paper is to identify the main factors affecting the wetland values and to examine the applicability of meta-regression analysis for summarizing the information from valuation studies of natural ecosystem. The total of 64 observations from 24 studies are assembled, and we observe significant differences in wetland values depending on the characteristics of the studies. With the statistical significance, our results indicate that the method employed affects the wetland values while the wetland function evaluated affects little. In addition, we found that the size of wetland is negatively associated with the values, implying that wetland values exhibit the decreasing returns to scale. The evidences from our empirical analysis suggest that the meta-analysis has a potential as a tool to synthesize the research results from valuation studies and to provide useful information to policy makers. However, this study acknowledges that more effort should be dedicated toward the construction of DB on valuation studies as well as the research on the model improvement to enhance the validity and reliability of meta-analysis.