• Spatial Information Research
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• v.15 no.3
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• pp.301-310
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• 2007

There are 21,000 National Surveying Control Points (NSCP) made of stone for precise surveying nationwide. NSCPs that provide location information are usually buried at the top of a mountain for view points that cannot be used by the public. Recently, according to the growing ubiquitous computing generation, location-based information has become very important and a service that can be easily accessed by the public is needed. In this research, a new type of reference point for a location information service is proposed. It is an Intelligent Reference Point (IRP) equipped with RFID tags and a two-dimensional bar-code system. The IRP system is composed of an electronic tag component, a tag identification component, and an IRP service component. We designed the IRP receiver identifying RFID tag and two-dimensional barcode was designed using a PDA, digital camera, and an RFID receiver. Also designed was IRP input data and input information. Furthermore, the operation software was developed in a PDA for identifying IRP and using IRP the service, and the IRP positioning method was developed using a GIS spatial analysis.

• Journal of Digital Convergence
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• v.15 no.4
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• pp.157-169
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• 2017

The purpose of this study is to understand the characteristics of O2O service which is emerging recently and to look for ways to take advantage of it. Recently, the emergence of various O2O services that utilize ICT technology of smartphone has attracted a lot of consumers. The study analyzed the characteristics of the O2O service and evaluated whether user satisfaction changes according to use safety. This study carried out a structured questionnaire, by collecting the material for the 421 general public in the country. Hypothesis tests showed that 4 characteristic of O2O services have positive impact on user satisfaction and regression analysis showed accuracy of information and pleasure have significant impact on user satisfaction. After cleaning up of these findings and discussing the theoretical and practical implications, this study provides direction for future research.

• (The) Research of the performance art and culture
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• no.35
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• pp.249-286
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• 2017

This study was started the problem consciousness on the tendency of current research which has only focused on specific school even though Salpurichum, which is passed down today, has passed through the first half of the 20th century. We can classify the data in which the tradition aspect of Salpurichum can be researched, into before and after the 1930s, the former is very faint but the latter is a national data at the national level so it is considered they can give a certain degree of trust in understanding the tradition. Even though the data before 1930s is insufficient but it possesses the historical value that tells the phenomenon of that time, this study intends to analyze while reflecting many socio-cultural contexts as much as possible, tries to understand the situation since the 1930s through the actual investigation of the survey report.

• Korean Journal of Child Care and Education Policy
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• v.12 no.3
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• pp.55-76
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• 2018

The study aims to investigate nocturnal sleep duration in 4-year-olds and relative effects of various factors including the personal factor (temperament), the familial factor (mother's employment status), the time-use factors (hours spent in childhood educare institutions, on napping in the institutions, and on using electronic media). The data of 937 4-year-olds collected by the Korea Children and Youth Panel Survey in 2012 was analyzed. Using SPSS 21.0 program, frequency analysis, descriptive statistics, Pearson's correlation analysis and hierarchical regression were conducted. The results are as follows. First, there were significant negative correlations among the personal factor, familial factor and time-use factors. Finally, the time-use factors showed largest explanatory power on variance of children's nocturnal sleep duration, followed by the familial factor. But the personal factor was not statistically significant. These results suggested that parents and childhood educare institutions need to cooperate in order for children to sleep well. It is also necessary to implement and spread the social systems to support healthy development of children.

• Journal of the Korea Convergence Society
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• v.12 no.8
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• pp.13-21
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• 2021

This study aims to analyze tourist inflow trends and consumption patterns using a geographic information system and big data analysis system. Songdo Central Park and Chinatown were selected among the major tourist destinations in Incheon, and floating population analysis and card sales analysis were conducted for one month in June 2017. The number of tourists visiting Songdo Central Park from metropolitan cities across the country was highest in the order of Incheon Metropolitan City, Gyeonggi-do, and Seoul Metropolitan City, and the proportion of foreign tourists was the highest in China. The number of card consumption used by Chinatown tourists was 12.4% higher for men than for women, and the amount of card consumption was also higher for men by 18%. This study has implications for proposing a strategic plan for tourism policy by analyzing the inflow trend and consumption pattern of tourists and deriving major issues in the establishment of tourism policy. Based on this study, it is expected that it can be helpful in improving the construction of tourism infrastructure in the future.

• Journal of the Korea Society of Computer and Information
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• v.14 no.2
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• pp.37-44
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• 2009

In this paper, we propose an efficient method which improves the performance of transmission of PGA which is essential data for real-time earthquake monitoring system. Currently, above 120 earthquake stations were installed nationwide and additional installation is expected because the social interesting of earthquake hazard is rising. Real-time earthquake monitoring system checks earthquake occurrence by using PGA were calculated from acceleration data of each seismic station. An efficient method of PGA data transmission is key factor of real-time monitoring. The key idea of proposed method is to deal with each seismic station using an unique ID, to assign one bit to indicate whether a packet include a station's data or not. Proposed method can contain more station data and decrease the data loss compared to current method. To verify proposed method, we investigate the turnaround time and ratio of data loss using above 91000 packets. As results of experiment. the proposed method is proven that the method need more time about 50% but reduce the data loss about 87% as compared to previous method.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.96-96
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• 2022

가상현실 (Virtual Reality, VR) 기술은 3차원 가상공간 내에서의 높은 몰입감에 기반한 체험을 바탕으로 다양한 분야에서 활용되고 있다. 소방훈련이나 태풍, 지진 등 재해 대응훈련과 같이 인명피해의 위험이 있는 재해에 대한 VR 기술을 활용한 방재교육은 위험성을 동반하지 않으면서도 현장감에 기반한 높은 교육적 효과를 창출할 수 있다. 한국전자통신연구원에서는 VR 기술을 이용하여 소방훈련을 위한 실감 소방훈련 시뮬레이터를 개발한 바 있으며 목동재난체험관에서는 홍수, 태풍, 지진 등 다양한 재해에 대한 안전교육을 위한 자연재해 가상현실체험을 운영하고 있다. 이외에도 전국 지자체 및 교육청에서는 방재교육을 목적으로 VR 기술을 활용하고 있다. 그러나 기존의 VR을 활용한 수재해 방재교육은 범람의 수리학적 특성과 함께 수해지의 지형적 특성을 적절히 반영하지 못하는 단점을 가지고 있다. 이는 방재교육이나 경각심을 부각하는 데엔 효과적이나 실질적인 방재 가이드라인을 제시하는 데엔 한계가 있다. 본 연구는 몰입형 파랑해석모형인 Celeris Base를 기반으로 3차원 가상현실 시각화를 활용한 수리학적 홍수추적 모형을 개발하였다. 3차원 가상현실 시각화는 Unity3D를 이용하여 모의환경 내에 구현되었다. 강우-유출 과정의 수리학적 해석을 위해 동수역학 수치모형의 연속방정식 내에 강우와 침투에 대한 항을 추가하였다. 침투모형으로는 Horton 모형, Green-Ampt 모형과 함께 사면의 기울기를 고려한 Green-Ampt 모형을 적용하였다. 실제 유역에서의 홍수추적 모의결과는 관측값과 비교적 잘 일치함을 확인하였다. 개발된 모형은 VR 방재교육을 통해 일반인의 수재해 대응능력 향상에 기여함과 동시에 정확성 높은 홍수추적 모의결과에 기반한 홍수대책 마련에도 활용 가능할 것으로 기대된다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.51 no.spc1
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• pp.209-214
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• 2006

One hundred Individuals that were collected from plains and mountains all around South Korea were used for this experiment. The inhibition abilities of lipid peroxidation by Artemisia spp. collections were compared with BHT (butylated hydroxytoluene). The results could be confirmed the excellency fur control of lipid peroxide level such as BHT 200 ppm in all mugwort collections. Antioxidant activity (AEAC), electron donating ability (EDA), total phenolic compound, and flavonoids of 100 Artemisia spp. collections were analyzed. Total phenolic compound contents of Artemisia spp. collections were ranged from 156 to 1,767 rng/100 g, and mugwort collections with more than 900 mg/100 g of total phenolic compound content were 20 individuals. Electron donating abilities were ranged from 13.4 to 95.0%, and mugwort collections over 90% of electron donating ability were 23 individuals. Antioxidant activity of ethanol extracts that used ABTS and DPPH radical were measured and mugwort collections with high total phenolic compound contents had high radical exclusion ability as well. Artemisia spp. collections, AC-60, AC-67, AC-77, that showed the high levels of antioxidant activities and had good growth characters and productivity, were selected for mass production.

• The Journal of the Korea institute of electronic communication sciences
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• v.6 no.4
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• pp.533-537
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• 2011

The revision of the criminal procedure act in 2008 marked a great turnaround in the criminal trial system in our country, and the criminal trial system has been based on the trial priority principle from then on. People in general have been entitled to participate in criminal trials, which can be called the jury system, and their awareness of the law has consequently been taken to another level. And the principle of trial by evidence that requires fair process, explanation and scientific evidence is realized in a manner to be appropriate at people(jury)'s level. The prosecution was introduced a video recording system to ensure the efficiency of scientific criminal investigation and assisted every prosecutor's office across the nation to hire computer-added stenographers to back up the documentation of statements during video recording. The purpose of this study was to examine the Korean and foreign computer-added stenography systems and the prospect of computer-added stenography of the video recording system that has been utilized to make a scientific investigation. The effort by this study to look into the roles and prospect of computer-added stenography in the video recording system that has been introduced to improve the efficiency of scientific investigation, which the prosecution pursues, is expected to expedite the advancement of criminal investigation, to guarantee the protection of human rights and to shed new light on the importance and status of computer-added stenography in the trial priority principle.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.46 no.2
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• pp.93-100
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• 2009

This paper presents a step up four channel DC-DC converter using charge pump voltage doubler structure. Our goal is to design and implement DC-DC converter for capacitive SP4T RF MEMS switch in front end module in wireless transceiver system. Charge pump structure is small and consume low power 3.3V input voltage is boosted by DC-DC Converter to $11.3{\pm}0.1V$, $12.4{\pm}0.1V$, $14.1{\pm}0.2V$ output voltage With 10MHz switching frequency. By using voltage level shifter structure, output of DC-DC converter is selected by 3.3V four channel selection signals and transferred to capacitive MEMS devices. External passive devices are not used for driving DC-DC converter. The total chip area is $2.8{\times}2.1mm^2$ including pads and the power consumption is 7.52mW, 7.82mW, 8.61mW.