• Journal of Internet Computing and Services
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• v.16 no.4
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• pp.61-70
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• 2015

This paper presents a web-based Java applet for understanding the concepts in digital logic circuits and student satisfaction survey was carried out in order to show its educational validity. Through our educational Java applet, the learners will be capable of learning the concepts and principles related to digital logic circuit experiments and how to operate virtual experimental equipments and virtual bread board. The proposed educational Java applet is composed of five important components: Principle Classroom to explain the concepts and principles for digital logic circuit operations, Simulation Classroom to provide a web-based simulator to the learners, Virtual Experiment Classroom to provide interactive Java applet about the syllabus of off-line laboratory class, Assessment Classroom, and Management System. With the aid of the Management System every classroom is organically tied together collaborating to achieve maximum learning efficiency. Finally, we have obtained several affirmative effects such as high learning standard, reducing the total experimental hours and the damage rate for experimental equipments.

• Korean Journal of Environment and Ecology
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• v.31 no.6
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• pp.578-585
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• 2017

This study was intended to analyze the visitors' awareness of the cultural asset value of Marsh Plants of Daesong-ri, Haman (Natural Monument 346) as well as the requirement for use and management of the only marsh designated as a National Monument in order to provide the implication for future management. The result of the analysis showed that the public awareness and the awareness level of the natural monuments were low and that the motivations for visiting were the experience and education of nature, rest and leisure, and experience of the cultural heritage, in that order. The analysis of motivation for visiting according to the awareness level showed that the group with a high awareness level of the Marsh Plants or the group that thought highly of its cultural asset value tended to visit it more for the experience of nature or the experience of the cultural heritage than for simple resting. For usage, the visitors required the basic amenities such as guide board and the more active promotion. They also preferred the discovery of traditional resources using the marsh plants and the experience of nature. Both local residents and outside visitors pointed out the lack of systematic management policy and lack of communication with local residents as the main problems. They recognized that the policy that balanced the preservation and usage through the cooperation of various stakeholder including local residents must be established and applied in the field to ensure proper management.

• Journal of Radiation Protection and Research
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• v.28 no.3
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• pp.255-261
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• 2003

An environmental radiation monitoring system based on high pressurized ionization chamber has been used for on-line gamma monitoring surrounding the KAERI (Korea Atomic Energy Research Institute), which transmits the dose data measured from ion chamber on the site via radio frequency to a central processing computer and stores the transmitted real-time data. Although communication using radio frequency has several advantages such as effective and economical transmission, storage, and data process, there is one main disadvantage that data loss during transmission often happens because of unexpected communication problems. It is possible to restore the loss data by off-line such as floppy disk but the simultaneous process and display of current data as well as the backup data are very difficult in the present on-line system. In this work, a new electronic circuit board and the operation software applicable to the conventional environmental radiation monitoring system are developed and the automatical synchronization of the ion chamber unit and the central processing computer is carried out every day. This system is automatically able to restore the backup data within 34 hours without additional equipments and also display together the current data as well as the transmitted backup data after checking time flag.

• Cartoon and Animation Studies
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• s.34
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• pp.263-292
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• 2014

This research explores websites of comics museum provided by the Korean Manhwa Museum and the Kyoto International Manga Museum and is supposed to analyze the type of content and finding out features. Since both museums specialize in comics and provide diverse information related to comics and their museums, this research analyze them on the basis of three types of categories, which are public relations content, professional content, and exhibition/education content The result shows that both museums generally provide similar type of information and content even though there are small differences. Especially, they have common points in the way that both offer detailed information of museum facilities and about exhibition schedules and education programs. However, the goal they are aiming at shows a difference. Korea Manhwa Museum tries to have interactive communication with its site visitors using the bulletin board system and to update newly published comics and events frequently managing separate websites. Kyoto International Manga Museum seems to focus on promoting itself in order to have more museum visitors. It provides detailed information such as history of the museum building, the object of setting up the museum and so on. Also, it provides four different foreign language websites.

• Journal of Navigation and Port Research
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• v.30 no.8 s.114
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• pp.643-648
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• 2006

The primary purpose of this study is to examine empirically the effect of foreign crew's cultural and organizational characteristics on their self-efficacy and organization commitment. Currently, the restrictions on the employment of the foreign crews are being eased in the Korean shipping industry and many problems are occurring consequently. However, specific and empirical studies on the relevancy of cultural characteristics to the crew's self-efficacy and organizational commitment on board the vessels with combined crews have not yet been carried out. To solve these problems, we examined how the cultural characteristics such as acculturation and accommodation of different culture related to the improvement of cultural homogeneity of vessels with combined crews influence on the self-efficacy, job satisfaction and organizational commitment of the foreign crews through SEM analysis. According to the results, hypothesis 1 and 2 were all supported with statistical significance. To conclude, this study suggests that foreign crew's cultural homogeneity and their self-efficacy should be firstly enhanced in order to improve organizational commitment on the vessel with combined crews. Furthermore, a study on self-efficacy of crew organization is urgently needed to enhance the effectiveness of an organization in a vessel with combined crews that has special environment. The result of this study will contribute a lot to the organization management of a vessel with combined crews.

• Journal of the Korean Recycled Construction Resources Institute
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• v.5 no.4
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• pp.427-434
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• 2017

The generation of construction waste can be divided into a decommissioning phase and a new construction phase, and most of the waste is generated at the decommissioning stage. However, recently, domestic new construction construction has expanded to 150 trillion yards per year, so construction work is increasing rapidly. Especially, as the size of the construction work with much waste of construction waste exceeds 100 trillion, the management of the amount of construction waste in the new construction site is required. Unlike the dismantling work site, the new construction site can separate waste generated by each property, and relatively low foreign matter content is generated. The purpose of this study was to investigate the amount of construction waste generated by new construction sites and to calculate the unit amount of construction waste based on this. In addition, since the existing unit cost is centered on concrete and mixed waste, we set the basic unit by setting synthetic resin, waste wood, and waste board as additional items. The basic unit survey was carried out to investigate the wastes according to the characteristics of each construction period. As a result of the survey, the new construction site showed that most wastes were discharged in the first 30% and after 70% of the process, and the ratio of mixed construction waste was as high as 45%. As a result of this study, it was found that about twice as much waste was produced as compared with the conventional standard product.

• Membrane Journal
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• v.23 no.1
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• pp.92-99
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• 2013

In this study the nanofiltration (NF) membrane treatment of a sulfuric acid waste solutions containing copper ion ($Cu^{+2}$) discharging from the etching processes of the printed circuit board (PCB) manufacturing industry has been studied for the recycling of acid etching solution. SelRO MPS-34 4040 NF membrane from Koch company was tested to obtain the basic NF data for recycling of etching solution and separation efficiency (total rejection) of copper ion. NF experiments were carried out with a dead-end membrane filtration laboratory system. The pure water flux was increased with the increasing storage time in sulfuric acid solution and lowering pH of acid solution because of the enhancement of NF membrane damage by sulfuric acid. The permeate flux of acid solution was decreased with the increasing copper ion concentration. Total rejection of copper ion was decreased with the increasing storage time in sulfuric acid solution and copper ion concentration, and lowering the pH of acid solution. The total rejection of copper ion was decreased from initial 37% to 15% minimum value.

• Journal of the Korean Data and Information Science Society
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• v.25 no.6
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• pp.1361-1369
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• 2014

This research is for analyzing the change rate of housing rent price index produced by KAB (Korea Appraisal Board) in the monthly periodical, Survey on Housing Monthly Rent. The index is a very important and useful indicator to understand and diagnose the house rental market. However, the index is criticized in that it tends to decline when the price level of Jeonse (i.e., a typical type of dwellings in Korea, generally leased on a deposit basis for 1 or 2 years) is highly going up, which is inconsistent with the actual economic sentiment of tenants. We verify the reason why such phenomenon occurs and suggest a simple but novel method to analyze properly the change rate of the index. The main findings are as follows. The key factor to trigger the problem is the use of the conversion rate for Jeonse-to-monthly rent for constructing the rent price indexes. We separate the effect of the conversion rate out of the change rate of the index and quantify the adjusted real change rate showing an increase of the rent price level which is masked by the conversion rate before.

• Journal of Conservation Science
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• v.7 no.2
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• pp.80-85
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• 1998

The structure, dimensions, condition and other characteristics of the Koryo Buddhist Canon (the Koreana Tripitaka) Printing Wood Blocks stored at the Haein-sa Monastery were surveyed to obtain basic data needed for the conservation of the Wood Blocks. The dimensions of the Wood Blocks Were measured and we could figured out the blueprint designed at the time of the carving the Wood Blocks. The dimensions of the wooden board were as follows: width, 8'chi'('cun' in Chinese, 24 cm);thickness, 1 'chi' (3 cm); length, 2'cha' ('chi' in Chinese) and 3 'chi' (68 cm) or 2 'cha' and 6 'chi' (78 cm). The dimensions of the end pieces were as follows: width, 1 'chi' and 5 'fun' (4.5 cm; thickness, 1 'chi' and 4 'fun' (4 cm); length, 8 'chi' and 2-4 'fun' (24.6-25.2 cm). There were 6 types of metal strips and the length of the nails employed was 1 'chl' (3 cm). Investigation on the differences in the length of the wood Blocks and the shapes of the metal strips will be of interest. Since we surveyed only small portion of the Wood Blocks. the result may be different if entire Wood Blocks were examined. The data acquisition of the entire Wood Blocks will be the basis to the conservation of the Wood Blocks.

• Health Communication
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• v.12 no.1
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• pp.73-84
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• 2017

Purpose: As the internet use of teenagers become more common, the need for research on the relationship between the internet and youth depression has emerged. The purpose of this study is to investigate the relationship between internet use and adolescent depression. Methods: The subjects of this study were youth attending elementary($6^{th}$ grade), middle($2^{nd}$ grade), and high schools($2^{nd}$ grade) belonging to the Busan Metropolitan City Office of Education. Depression was assessed using the BDI depression scale. Internet functions were classified into 10 categories, and the degree of use by Internet functions was examined. The most frequently used Internet sites were surveyed. Univariate analysis using $X^2$ test and multivariate analysis using logistic regression analysis were conducted to find out the difference of internet and smartphone media function on depression according to elementary, middle and high school students. Results: Depression was higher of 13.2 times for students who use online transactions (goods purchase), 0.07 times for students who use 'bulletin board' activities in elementary students. Depression was higher of 1.55 times for those who use online transactions (purchasing goods), and 2.3 times for those who use adult sites for middle school students. Depression was higher of 2.1 times when using e-mail and 1.9 times when using other information retrieval for high school students. Conclusion: It is necessary to consider characteristics of internet utilizing pattern by school class in policy regulation and prevention program to reduce youth depression.