• Journal of Advanced Navigation Technology
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• v.27 no.3
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• pp.300-305
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• 2023

In this paper, we confirmed that an efficient sensor network can be established at a low cost by applying Geofencing technology to a LoRa-based sensor network and verified its effectiveness in disaster management such as forest fires. We detected changes through GPS, gyro sensors, and combustion detection sensors, and defined the validity size of the Geofencing cell accurately. We proposed a LoRa Payload Frame Structure that has a flexible size according to the size of the sensor information.

• Information Systems Review
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• v.18 no.3
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• pp.111-135
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• 2016

The major characteristic of open source software (OSS) is innovativeness. Innovativeness stems from the process of sharing and solving technical problems. This study analyzes the impact of voluntary participation and collaboration of OSS developers on sustained participation in the community based on organizational citizenship behavior and social capital theories. Based on Bolino et al. (2002) and Wasko and Faraj (2005), a research model and hypotheses are developed. A total of 152 OSS developers participated in the survey. The hypotheses are tested by LISREL modeling. The results of analysis show that royalty, social participation, and advocacy participation enhance or positively influence social capital. In addition, reciprocity and shared vision reinforce intention of sustained knowledge contribution. However, the result shows a statistically insignificant relationship between social participation and shared vision and between cohesiveness and intention of sustained knowledge contribution.

• Journal of Life Science
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• v.34 no.1
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• pp.1-8
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• 2024

Brain-type natriuretic peptide (BNP) is a cardiac hormone that exerts cardiovascular and renal effects and regulates metabolic processes. In the current study, to determine the hepatic effects of BNP, we investigated whether it improves high-fat diet (HFD)-induced hepatic IR and characterized its possible mechanism. No significant differences in body weight, fat mass, or lean mass were observed between the saline- and BNP-treated groups of normal diet-and HFD-fed mice. During the clamp test, the BNP infusion into HFD-fed mice led to lower blood glucose levels and increased glucose infusion rates versus that into saline-treated HFD-fed mice. The BNP infusion also inhibited hepatic glucose production and decreased hepatic triglyceride levels concomitant with decreased expression of gluconeogenesis and lipogenesis-related genes, resulting in reduced levels of alanine aminotransferase and aspartate aminotransferase. BNP increased the phosphorylation of Akt and AMP-acti- vated protein kinase (AMPK) in the livers of HFD-fed mice compared to saline-fed HFD mice. The incubation of AML12 murine hepatocytes with BNP increased the basal levels of phosphorylated Akt and AMPK and recovered the phosphorylated Akt and phosphorylated AMPK levels reduced by palmitate treatment. Furthermore, BNP incubation prevented palmitate-induced increases in lipo- genesis gene expressions. Taken together, the current study's findings indicated that BNP ameliorates hepatic IR, resulting in reduced hepatic glucose production and hepatic steatosis.

• Explosives and Blasting
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• v.26 no.2
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• pp.77-91
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• 2008

According as demand for superannuated building increases recently, much researches about demolition method of construction are going on. This case study executed to center library building located in Dankook University. Explosives demolition method applied Progressive Collapse. Explosives demolition main blasting floors are 2, 4floor, assistance blasting floor is 1 floor. In the nearest distance (150 m), Vibration measurement result were 0.0302 cm/sec (PPV). Change was not in measurement value is crack gauge which install beforehand.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.421-423
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• 2005

유비쿼터스 컴퓨팅 시대가 다가오면서 대학도 유비쿼터스 캠퍼스(u-Campus)로의 변화를 꾀하고 있다. 더불어 u-Campus에서 제공될 유비쿼터스 컴퓨팅 기술 기반의 새로운 서비스가 요구된다. 본 논문에서는 기존의 바코드 기반 기자재 관리 서비스를 RFID 시스템을 이용하여 새롭게 구현하는 방안을 제시하고 있다. 이렇게 함으로써 우선 인식을 통한 기자재의 정보가 실시간으로 제공되며 검색을 통한 빠른 서비스와 반입/반출 관리 등 보안을 강화한 기능도 제공이 가능하다. 이와 같은 u-Campus 기자재 관리 서비스는 기존의 방식에 비해 인력과 시간, 비용 절감을 기대할 수 있는 효과적인 기자재 관리 서비스를 제공할 수 있다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.427-428
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• 2023

최근 COVID - 19로 인하여 다양한 수업방식이 활성화됨에 따라 비대면 수업방식이 주목받고 있다. 컨텐츠에 대한 소비패턴 변화와 가상융합기술이 발전함에 따라 해결책으로 메타버스가 대두되었으며 다양한 플랫폼을 지원하고 사용자가 가장 많은 마인크래프트 이용하였다. 마인크래프트는 사용자의 자유도가 높은 샌드박스 형식의 게임이다. 마인크래프트를 활용하여 메타버스 내에서 실시간 수업, 체육대회 등 실제와 유사한 활동을 바탕으로 구현함으로써 보다 친근한 메타버스를 제작하였다.

• Convergence Security Journal
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• v.16 no.7
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• pp.3-11
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• 2016

With repid development of optical networking technology, Software-Defined Network (SDN) and Network Function Virtualization (NFV), high performance networking service, collaboration platform that enables collaborative research globally, drastically National Research Network (NRN) including Internet Service has changed. Therefore we compared and analyzed several world-class NRNs and took a view of future development strategy of the NRN. Also we suggest high speed security environment in super high bandwidth network with 40Gbps and 100Gbps optical transmission technology, network separation of NRN with Science DMZ to support high performance network transmission for science big data, building security environment for last-mile in campus network that supports programmability of IDS using BRO framework.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.1904-1908
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• 2008

본 연구에서는 해안가 암반대수층에서 전기전도도의 수직적인 변화를 관측하여 조석에 의한 해수와 담수 전이대의 특성을 파악하였다. 연구지역은 부경대학교 대연캠퍼스 주변 해안대수층이며, 응회질퇴적암과 안산암 및 안산암질 화산각력암 등이 분포한다. 연구에 이용된 지하수 관측공 (PK1공)은 부경대학교 대연캠퍼스 내 기숙사 동측에 위치하고 있다. 지하수공의 개발심도는 지표 면하 120 m, 케이싱은 지표면하 19 m까지 설치되어 있으며, 내경은 0.2 m로서 해안가에서 180 m 정도 이격되어 있다. 해안대수층 내 해수와 담수 전이대를 파악하기 위하여 관측공 내에 TLC Meter(Model 107, Solinst)를 삽입하여 전기전도도의 수직적인 변화를 지하수공 내 심도 50 m 까지 측정하였다. 전기전도도의 수직적인 관측은 썰물(low tide)일 때, 썰물에서 밀물(high tide)로 될 때 및 밀물일 때로 나누어 총 3회 수행되었다. 전체적인 전기전도도의 분포는 썰물일 때 $630{\sim}47300{\mu}S/cm$, 썰물에서 밀물로 되는 시기에는 $672{\sim}61900{\mu}S/cm$ 및 밀물일 때는 $678{\sim}67900{\mu}S/cm$로 나타났으며, 따라서 밀물일 때가 썰물일 때보다 전기전도도의 농도가 높은 것으로 나타났다. 해수와 담수 전이대의 분포는 썰물일 때 약 $20{\sim}50\;m$, 밀물일 때 약 $20{\sim}38\;m$ 정도로 나타났으며, 이는 밀물 시 해수의 침투로 인해 전이대 하부구간의 농도가 상승하였기 때문이다. 해수와 담수 전이대의 구간을 세분화하여 분석하기 위해, 담수가 우세한 전이대, 주 전이대 및 해수가 우세한 전이대 구간으로 구분하였다. 담수가 우세한 전이대는 썰물과 밀물일 때 모두 지표면하 $20.0{\sim}25.5\;m$ 구간이었으며, 주 전이대에서는 지표면하 $25.5{\sim}25.7\;m$ 정도로 나타났다. 그러나, 해수가 우세한 전이대에서는 썰물일 때 지표면하 $25.7{\sim}50.0\;m$ 구간, 밀물일 때는 지표면하 $25.7{\sim}38.0\;m$ 로서 전이대의 폭이 19 m 정도의 차이를 보였다. 본 연구를 통해 해안가 암반대수층에서 해수와 담수의 전이대는 조석에 의해 영향으로 인해, 썰물 시의 전이대가 밀물에 비해 그 폭이 더욱적음을 확인할 수 있었다.

• Journal of Digital Convergence
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• v.19 no.2
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• pp.221-230
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• 2021

The study attempts to suggest potential problem and solutions expected in the process of implementing KASS, which is currently under development to improve the domestic navigation safety system, and to summarize improvement effects of domestic navigation safety system anticipated by the implementation of KASS. Challenges expected in the process of implementing KASS exists in four aspects: emotional, technical, cost, safety aspects. When KASS is implemented and operates, various benefits can be realized. Benefits include cost savings by not using navigation safety systems during takeoff and landing; reduction of flight delays and cancellations by removing airway congestion; increase of aircraft accommodation capacity; reduction of carbon emissions; preparation for future aviation demands and improvement of air transportation safety; and reduction of flight accidents. In conclusion, it is expected to enter into an era of more intense competition due to increased aviation demands. In order to survive in this competitive environment, early introduction of KASS is indispensable. Analysis results of this study are expected to provide reference information for academic research in this area. A possible future research topic include a study predicting the changes in the navigation safety systems introduced by KASS and proposing practical and useful ways to respond the changes.

• Journal of Advanced Navigation Technology
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• v.22 no.6
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• pp.654-664
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• 2018

In this paper, this system is operated by PCS that is driven by being synchronized voltage fed inverter and AC source, and in the steady state of power source charge battery connected to DC side with solar cell using a photovoltaic (PV) that it was so called constant voltage charge. it can cause the effect of energy saving of electric power, from 10 to 20%. and through a normal operation of electric energy storage system (EESS). In addition, better output waveform was generated because of pulse width modulation (PWM) method, and it was Proved to test by experiment maintained constant output voltage regardless of AC source disconnection, load variation, and voltage variation of AC power source.