• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.5
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• pp.36-46
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• 2019

The number of hosts connected to the Internet has increased dramatically, introducing the Domain Name System(DNS) in 1984. DNS is now an important key point for all users of the Internet by allowing them to use a convenient character address without memorizing a series of numbers of complex IP address. However, relative to the importance of DNS, there still exist many problems such as the authorization allocation issue, the disputes over public registration, security vulnerability such as DNS cache poisoning, DNS spoofing, man-in-the-middle attack, DNS amplification attack, and the need for many domain names in the age of hyper-connected networks. In this paper, to effectively improve these problems of existing DNS, we proposed a method of implementing DNS using distributed ledger technology, blockchain, and implemented using a Ethereum-based platform. In addition, the qualitative analysis performance comparative evaluation of the existing domain name registration and domain name server was conducted, and conducted security assessments on the proposed system to improve security problem of existing DNS. In conclusion, it was shown that DNS services could be provided high security and high efficiently using blockchain.

• Journal of The Korean Association For Science Education
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• v.39 no.1
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• pp.143-160
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• 2019

This study investigated 15 science teachers' perception and practice on free semester and science assessment. We analyzed frequencies of teacher choice for closed questions and used constant comparative method for teacher description and individual interview. Most teachers determined a low ranking for changes in assessment methods and mentioned a lack of objectivity on free semester assessment, unsystematic free semester assessment, and more importance on student activity and interest in science instruction. Most teachers understood process-based assessment as a direction of free semester assessment and teachers mentioned positive aspects for students or teacher difficulties dependent on their perception on process-based assessment. Half of the teachers failed to implement student self-assessment and student peer-assessment due to subjectivity and complexity. Some teachers did not provide feedbacks to students due to a lack of time and did not use certain assessment methods due to a lack of knowledge of the assessment. Teachers who did not have an experience of discussions in a teacher learning community mentioned reasons regarding a small number of the same grade teachers and inactive attitude of colleagues. Teachers who did not participate in professional development programs mentioned a lack of teacher understanding of free semester, participation of the teacher in charge, and teacher choice of participation as reasons.

• Korean Journal of Remote Sensing
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• v.35 no.2
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• pp.203-215
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• 2019

As hyperspectral sensors that can be mounted on drones are developed, it is possible to acquire hyperspectral imagery with high spatial and spectral resolution. Although the importance of atmospheric correction has been reduced since imagery of drones were acquired at a low altitude,studies on the conversion process from raw data to spectral reflectance should be done for studies such as estimating the concentration of surface materials using hyperspectral imagery. In this study, a vicarious radiometric calibration and an atmospheric correction algorithm based on atmospheric radiation transfer model were applied to hyperspectral data of drone and the results were compared and analyzed. The vicarious calibration method was applied to an empirical line calibration using the spectral reflectance of a tarp made of uniform material. The atmospheric correction algorithm used ATCOR-4 based Modran-5 that was widely used for the atmospheric correction of aerial hyperspectral imagery. As a result of analyzing the RMSE of the difference between the reference reflectance and the correction, the vicarious calibration using the tarp in a single period of hyperspectral image was the most accurate, but the atmospheric correction was possible according to the application purpose of using hyperspectral imagery. If the correction process of normalized spectral reflectance is carried out through the additional vicarious calibration for imagery from multiple periods in the future, accurate analysis using hyperspectral drone imagery will be possible.

• Journal of Korean Society of Disaster and Security
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• v.13 no.4
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• pp.65-74
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• 2020

Continuous and accurate instrument of river water usage is needed for sustainable river water management. Although the instrument methods applicable to each point of use of river water are different, more precise direct instrument methods are required at the point of major open channel. Users of river water should select appropriate direct instrument methods to measure usage, but there is a lack of standards and verification research. In this study, the H-Q rating curve method, ultrasonic method, and microwave method were applied directly to the test basin in the upper basin of Mangyeong river, and the accuracy of measurement data was evaluated by comparing absolute error between discharge data calculated by instrument method. When comparing the calculated discharge of point units, the ultrasonic method showed the best results of the actual measurement. Through continuous instrument, the sum of the daily and monthly units was compared, and the ultrasonic and microwave methods were shown to be highly accurate. Based on the results of this study, it is hoped that the appropriate direct measurement method can be selected according to the importance of the river water use facility, considering that the ultrasonic method and the microwave method are relatively costly compared to the water level-flow relationship method.

• Journal of Legislation Research
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• no.54
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• pp.155-192
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• 2018

As the 'hyper-connected society' has emerged through the 'Fourth Industrial Revolution, public interests as well as social dangers have increased. Above all, the risk of infringement of information, including confidential personal information, is dramatically increasing. As the hyper-connected society has been realized, even if only one of the internet devices is hacked, there would be a danger that the ripple effect of such a hacking spreads to the whole network. Therefore, the necessity and importance of information security, including cybersecurity, has been increasing. In other words, the stability of cyberspace and internet space is becoming more important. As a result, the Korean government is seeking to build a legal system related to information security, which would be able to cope with the information infringement problem in the hyper-connected society. However, it seems that the government is still struggling with the direction of building such a legal system. In this context, a comparative review examining the legal systems of advanced foreign countries will provide meaningful implications as to what kinds of legal policies we should devise and implement for information security. In particular, the U.S. legislative act that actively responds to the cybersecurity violations is worthy of reference. For this reason, this article systematically analyzes the current status of the U.S. cybersecurity laws. Especially, this article focuses on the "Cybersecurity Information Sharing Act of 2015"(hereinafter "CISA"), that was recently enacted by the U.S. congress. The CISA prescribes the systemic and detailed information-sharing between national and private entities. The CISA, that actively promotes information-sharing, is full of suggestions for us, in that information-sharing is an effective way to properly realize information security in today's hyper-connected society.

• International Area Studies Review
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• v.22 no.3
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• pp.293-317
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• 2018

In the era of glocalization, the role of the state is gradually being reduced and the roles of cities and regions are becoming more critical, especially for the everyday life of residents. Many attempts have been made to secure regional competitiveness based on local identity, to differentiate it from other cities and regions, and to search for methods of sustainable development. The importance of place, which affects human life-world, is getting to garner more attention whereas the large-scale development-centered approach has becoming less prominent. The objective of the study is to investigate the concept of place-making and to apply for the East Asian regions, which seems to be differentiated from urban cultural frameworks of the West. The paper employs comparative methodology for the placemaking strategies of the three case locations, say Mok-dong in Seoul, Koganecho in Yokohama and red town in Shanghai. By through examining the three stages of place-making for each three place, it reveals that cultural identity is quintessential in the East-Asian region. In conclusion, it suggests a sustainable place-making strategies for urban areas in East-Asian regional setting.

• The Journal of Korean society of community based occupational therapy
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• v.10 no.3
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• pp.27-35
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• 2020

Objective : This study was to examine the effects of general characteristics and fall efficacy on health care program needs through a comparative analysis of general characteristics and health care program needs for the elderly. Methods : In this study, we analyzed data from 118 elderly people with t-test and ANOVA for comparison of fall effectiveness and health care program requirements and with regression for general characteristics and effects of fall effectiveness on health care program needs. Results : The results were as followed: First, there was a significant difference in gender(p=.00), age (p=.00),educational background(p=.00), and existence of spouse(p=.00), and no significant difference in income(p=.17) based on fall efficiency according to the general characteristics. There was a significant difference in gender(p=.00), age(p=.00), educational background(p=.00), and income(p=.00) and no significant difference in existence of spouse (p=.46) based on health care program needs according to the general characteristics. Second, it was shown that the higher age, the higher the income, the higher the effectiveness of the fall, and in case of woman, the more significant the effect of the exercise program had.. The explanation was 56 percent. Third, the higher the age, the higher the income, and the higher the fall efficiency, the more meaningful the cognitive program demand. The explanation was 48 percent. Conclusion : The data from this study showed the importance of fall efficacy in older people with significantly higher risk of falls than in other age groups, and the need for exercise and cognitive management programs to prevent falls.

• The Journal of Korean society of community based occupational therapy
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• v.10 no.3
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• pp.53-61
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• 2020

Objective : The purpose of this study was to find out the stress of vascular conditions and leisure activities for the elderly and the effect of stress problems on the vascular conditions of the elderly. Methods : The study surveyed 172 elderly people, conducted a validity and reliability analysis to organize items of leisure activities, analyzed vascular conditions and stress for leisure activities, and conducted a regression analysis to analyze stress factors affecting the blood vessel conditions of the elderly. Results : First, there was a significant difference in comparing the average value of vascular conditions for leisure activities in the elderly (p=.012) and sports activity was the most stable in vascular conditions. Second, there was a significant difference in comparing the average value of stress for leisure activities of the elderly (p=.035) and rest and other activities were higher than other activities. Third, the effect of stress problems in older people on vascular conditions has been shown to be influenced by financial difficulties and health problems. Conclusion : Leisure activities in older people can act as a factor in changing the quality of life. Older adults can expect improvement of vascular conditions and reduction of stress through leisure activities, especially sports activities have a high relationship of vascular conditions, and rest and other activities have a high relationship with stress. As a result, this study confirmed the importance of selecting and continuing participation in leisure activities for the elderly.

• KIPS Transactions on Computer and Communication Systems
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• v.11 no.7
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• pp.233-240
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• 2022

Most of the recent AI researches has focused on developing AI models. However, recently, artificial intelligence research has gradually changed from model-centric to data-centric, and the importance of learning data is getting a lot of attention based on this trend. However, it takes a lot of time and effort because the preparation of learning data takes up a significant part of the entire process, and the generation of labeling data also differs depending on the purpose of development. Therefore, it is need to develop a tool with various labeling functions to solve the existing unmetneeds. In this paper, we describe a labeling system for creating precise and fast labeling data of medical images. To implement this, a semi-automatic method using Back Projection, Grabcut techniques and an automatic method predicted through a machine learning model were implemented. We not only showed the advantage of running time for the generation of labeling data of the proposed system, but also showed superiority through comparative evaluation of accuracy. In addition, by analyzing the image data set of about 1,000 patients, meaningful diagnostic indexes were presented for men and women in the diagnosis of sarcopenia.

• Journal of Mushroom
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• v.20 no.3
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• pp.119-126
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• 2022

As the importance of public health increases with the spread of infectious diseases, functionality has become a factor affecting consumers' purchase of mushrooms. Therefore, the bioactive components of button mushrooms (Agaricus bisporus), which are generally known to promote button mushroom consumption, were analyzed. White and brown button mushrooms were compared and white beech mushroom (Hypsizygus marmoreus) were used as a control. White button mushrooms had higher sugar and inorganic potassium concentrations than brown button mushrooms, whereas sodium, magnesium, and vitamin C concentrations were not significantly different between the different button mushrooms. Moreover, there was approximately twice as much ergosterol in white button mushrooms than brown button mushrooms. Brown button mushrooms had higher concentrations of 𝛽-glucan and oxalic acid than white button mushrooms, but there was no significant difference in total organic acid content between the two mushroom types. High concentrations of the essential amino acids, ergothioneine, isoleucine, and leucine and the non-essential amino acids, glycine and alanine, were observed. Concentrations of the vitamin B group and total polyphenols were also high.