• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.186-188
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• 2014

In recent years, domestic as well as LTE wireless network of Wi-Fi and most used. In addition, mobile-intensive services that used mainly in our society makes it easier, SNS, application (APP), and file downloads. As such, the amount of data requested, while living at the time of mobile users will want to be safe from the earliest. And the wireless network communications mortality (3G, 4G (LTE), LTE-A) and Wi-Fi (802.11 n-2.4 G H z z H a c-5, 802.11 G), and users are mainly used in the death 4G (LTE), communication Wi-Fi, 802.11 n-2.4 GHz are used most frequently. As above, use the wireless network in order to safely and quickly developed the technology of the Li-Fi. Li-Fi light (visible light) technology to communicate with, and Wi-Fi (802.11 n-2.4 G z H) 100 times faster, LTE-A 66 times faster. However, the current Li-Fi to commercialise the big issue exists. In this paper, there are a lot of existing problems in the commercialization of Li-Fi being used in Wi-Fi, and a comparative analysis.

• The Journal of Korean Association of Computer Education
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• v.22 no.1
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• pp.87-98
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• 2019

It is easy to assume that contradictions are logically incorrect or empty sets that have no solvability. This dilemma, which can not be done, is difficult to solve because it has to solve the contradiction hidden in it. Paradoxically, therefore, contradiction resolution has been viewed as an innovative and creative problem-solving. TRIZ, which analyzes the solution of the problem from the perspective of resolving contradictions, has been used for people rather than computers. The Butterfly model, which analyzes the problem from the perspective of solving the contradiction like TRIZ, analyzed the type of contradiction problem using symbolic logic. In order to apply an appropriate concrete solution strategy for a given contradiction problems, we designed the Butterfly algorithm based on decision making tree. We also developed a visualization tool based on Python tkInter to find concrete solution strategies for given contradiction problems. In order to verify the developed tool, the third grade students of middle school learned the Butterfly algorithm, analyzed the contradiction of the wooden support, and won the grand prize at an invention contest in search of a new solution. The Butterfly algorithm developed in this paper systematically reduces the solution space of contradictory problems in the beginning of problem solving and can help solve contradiction problems without trial and errors.

• The Journal of the Korea Contents Association
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• v.18 no.12
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• pp.558-569
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• 2018

The purpose of this study is examine the effect of social work field practicum related factors on empowerment of students majoring in social welfare. For this purpose, a survey of the university students with completing social work field practicum was conducted and data was analyzed. The results of this study are summarized as follows: The empowerment level of the students with completing social work field practicum is 3.71. Multiple regression analysis was conducted for each sector by dividing the factors related to the social welfare field practicums affecting the empowerment into individual factors, practical institutional factors, and school factors. Degrees of practice(${\beta}=.123$, t=2.405, p<.05), the satisfaction level of the supervisor(${\beta}=.176$, t = 2.446, p <.05), the lecture satisfaction level of the practicum(${\beta}=.229$, t=4.018, p<.001) were found to affect the empowerment in each sector. But in final analysis with all factors have been concerned, the lecture satisfaction level of the practicum(${\beta}=.257$, t=4.495, p<.001) had a positive effect on the empowerment. Based on these results, implications for research and practice were discussed.

• The Journal of Korean Obstetrics and Gynecology
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• v.32 no.1
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• pp.37-47
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• 2019

Objectives: The purpose of this study was to analyze the current characteristics and prescriptions of outpatients with Polycystic Ovary Syndrome (PCOS). Methods: We searched medical records from January 1, 2017 to December 31, 2017 and found out 31 patients who first visited with PCOS. Results: The average age of PCOS patients was $26.48{\pm}5.15years$ old, average height was $162.16{\pm}5.56cm$, average weight was $55.27{\pm}9.34kg$, and average BMI was $21.01{\pm}3.48kg/m^2$ A total of 24 patients who had received western treatment for PCOS in the past, 13 people received oral contraceptions, 4 hormones, 2 metformin, one hormone and metformin, also 4 people were treated for assisted reproductive technologies due to infertility. There were only two patients who combined Korean and Western treatments. The most common menstrual-related symptoms of PCOS patients were oligomenorrhea (48.4%) and dysmenorrhea (22.6%). Other symptoms were the highest in the cold symptoms (54.8%), followed by infertility (9.7%). The average number of patients visiting the hospital was $6.26{\pm}7.2$, with 22 (71.0%) coming from 1 to 5. The average treatment period for patients was $10.1{\pm}10.8weeks$, with 41.9% the largest for 1 to 4 weeks. Acupuncture (93.5%), moxibustion (96.8%) herbmed (96.8%) was treated to most PCOS patients. The most commonly used herbal medicines were Ongyeong-tang (35.5%), Ijin-tang-gami (19.4%), Dodam-tang-gami (12.9%), and Jogyeongjongok-tang-gami (12.9%). Conclusions: These results could be helpful to treat PCOS patients in Korean gynecologic clinical fields.

• The Journal of the Korea Contents Association
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• v.18 no.12
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• pp.150-160
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• 2018

Purpose: This study was conducted to understand what various factors influence school life adaption of nursing students by measuring life stress, anger and optimism. Methods: The subjects were 186 students in B city and the data were collected for the period of 17-28 April 2017. The collected data were analyzed with an independent t-test, ANOVA, Scheffe's method, Cronbach's alpha and Pearson's correlation coefficients. The results are as follows respectively: life stress 1.34/4, state anger 1.24/4, trait anger 1.57/4 at average, and among optimism was 3.45/5 at average. Multiple regression analysis showed perceived physical health status(${\beta}=.20$ t=2.72, p=.007), satisfaction on college(${\beta}=.19$, t=2.53 p=.012) and life stress (${\beta}=-.14$ t=-2.28, p=.027) were related to factors. They accounted 18.2% of the optimism of the subjects. However, there was no significant correlation between optimism and anger of nursing students. Conclusion: It is necessary to develop a program to improve the optimism of nursing college students and to develop a program that can enhance the coping ability of stress to cope with life stress experienced by nursing students.

• The Journal of the Petrological Society of Korea
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• v.27 no.4
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• pp.223-233
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• 2018

In this study, SHRIMP zircon U-Pb dating was performed on deformed granitic rocks in the Sancheong area in the northeastern part of the Jirisan area, southwest of Yeongnam Massif. Until now, these have been known as Precambrian or age-unknown old igneous rocks, but the U-Pb concordant ages obtained from two samples are $237.8{\pm}4.0Ma$ and $230.2{\pm}3.4Ma$, respectively, showing their emplacements in Early to Middle Triassic. These results indicate that the deformed granite was emplaced at about 238~230 Ma. The study area shows the characteristics of ductile deformation with prominent development of foliation, augen structure, and lineation. It is observed that the deformed granites occur as xenoliths within the syenite, indicating that the time of deformation is earlier than the intrusion of the syenite of about 220 Ma. The emplacement and deformation periods of the deformed granite is similar to that of Permo-Triassic granite gneisses distributed in the Gimcheon and Andong areas of the Yeongnam Massif. Taken together, the eastern part of the Yeongnam Massif, extending from the central part to the southwestern part, granite intrusions occurred at about 260-230 Ma, followed by metamorphism-deformation of about 230-220 Ma.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.2
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• pp.750-762
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• 2019

The importance of the call center as a contact point for the enterprise is growing. However, call centers have difficulty with their operating agents due to the agents' lack of knowledge and owing to frequent agent turnover due to downturns in the business, which causes deterioration in the quality of customer service. Therefore, through an N-bank call center case study, we developed a system to reduce the burden of keeping up business knowledge and to improve customer service quality. It is a "real-time agent advisor" system that provides agents with answers to customer questions in real time by combining AI technology for speech recognition, natural language processing, and questions & answers for existing call center information systems, such as a private branch exchange (PBX) and computer telephony integration (CTI). As a result of the case study, we confirmed that the speech recognition system for real-time call analysis and the corpus construction method improves the natural speech processing performance of the query response system. Especially with name entity recognition (NER), the accuracy of the corpus learning improved by 31%. Also, after applying the agent advisor system, the positive feedback rate of agents about the answers from the agent advisor was 93.1%, which proved the system is helpful to the agents.

• Journal of Navigation and Port Research
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• v.42 no.6
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• pp.459-468
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• 2018

Deep-sea fishing vessel No. 501 Oryong was fully flooded through its openings and sank to the bottom of the Bering Sea. The tragic accident was attributed to rough sea weather after a fishing operation in the Bering Sea, and led to the death or loss of many crewmen. In this study, the ship stability calculation was carried out using KST-SHIP (ship calculation system of KST), considering the free surface effect and fish catch arrangement according to the progress of its sinking accident, and stability after flooding was analyzed. The calculation results obtained using KST-SHIP were verified by comparing them to intact stability calculation sheet of the accident ship under the full load departure condition, and intact stability according to displacement from the departure of accident ship up to the moment of the accident was calculated and analyzed. The stability after flooding was also calculated and analyzed according to the progress during its sinking accident.

• Journal of Navigation and Port Research
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• v.42 no.6
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• pp.395-405
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• 2018

Seakeeping safety module in Korean e-Navigation system is one of the ship remote monitoring services that is employed to ensure the safety of ships by monitoring the ship's real time performance and providing a warning in advance when the abnormal conditions are encountered in seakeeping performance. In general, seakeeping performance has been evaluated by simulating ship motion analysis under specific conditions for its design. However, due to restriction of computation time, it is not realistic to perform simulations to evaluate seakeeping performance under real-time operation conditions. This study aims to introduce a reasonable and faster method to predict a ship's roll motion which is one of the factors used to evaluate a ship's seakeeping performance by using a machine learning-based surrogate model. Through the application of various learning techniques and sampling conditions on training data, it was observed that the difference of roll motion between a given surrogate model and motion analysis was within 1%. Therefore, it can be concluded that this method can be useful to evaluate the seakeeping performance of a ship in real-time operation.

• Journal of Climate Change Research
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• v.1 no.3
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• pp.205-210
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• 2010

LED light has various advantages such as an energy saving effect of over 80% compared to existing lighting and environmentally friendly characteristics; however, there has been no affordable market for LED lighting because of its expensive price. This study discussed the validity of the expansion of distribution of LED lighting through an assessment of economic efficiency concerning LED lightening in order to analyze its efficiency in terms of energy savings and maintenance and repair, which will be generated as a result of the change from existing incandescent bulbs to LED lighting in the public sector. As to the target of analysis, the paper reviewed the validity of change to LED lighting as a result of the elimination of existing incandescent bulbs, by referring to 'the current incandescent bulb use and elimination performance' published by the Ministry of Knowledge Economy based on the "Elimination management system" executed by Korea Energy Management Corporation. The paper considered expenses for change, annual power savings amount and electric charges savings amount, repair and maintenance cost, $CO_2$ reduction volume, and the profit from the sale of CER (certified emission reduction). As a result of analyzing economic efficiency, when the discount rate during the change of existing incandescent bulb lighting to LED lighting is 3.26%, the profit was 8,648,400,000 won. Accordingly, NPV was analyzed to have a 'positive (+)' value, which means that this change is profitable.