• 한국통신학회논문지
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• 제36권7A호
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• pp.654-661
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• 2011

RTLS(Real Time Locating System)은 사람이나 사물의 위치를 실시간으로 추적하는 시스템이다. 이 시스템에서는 RTLS 리더가 태그와 무선 통신으로 시간이나 거리 등을 측정하고, 위치 엔진은 이를 이용하여 태그의 위치를 추정한다. 하지만 사물을 위치를 추정하는 데 있어 비가시성에 따른 측정 오류는 성능에 심각한 영향용 미친다. 비자시성은 측위 시스템을 실제 환경에 적용하기 위해 반드시 일어나는 요소이며, 이를 해결하기 위해 본 논문에서는 거리를 역추적하여 알맞은 리더를 찾아내는 선택법을 이용한 새로운 측위 시스템을 제안한다. 제안한 기법을 실제 구현하여 실험한 결과 기존 기법에 비해 50% 이상 향상된 것을 알 수 있었다.

• 한국대기환경학회지
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• 제27권4호
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• pp.443-453
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• 2011

Real-time Traffic Information Service could play a key role in reducing incomplete combustion time remarkably since it can provide traffic information in real-time basis. Emission characteristics of test engines were studied in terms of travel distance and speed. The present study focused on a north district in Daegu, 12 km. The driving for the emission test was done at 8AM, 3PM, 7PM which represents various traffic conditions. The reduced emissions of Greenhouse Gases (GHG) have been measured for a travel distance running at different loads (conventional shortest route and Real-time Traffic Information) and GHG ($CO_2$, $CH_4$, $N_2O$) are all inventoried and calculated in terms of existing emission factors. The emission of GHG has been shown to reduce linearly with travel distance: $CO_2$ (9.15%), $CH_4$ (18.43%), $N_2O$(18.62%).

• The Journal of Asian Finance, Economics and Business
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• 제8권7호
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• pp.275-283
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• 2021

Globalization has greatly contributed to an increased need for improvement of human capital, and particularly in the development of the real estate and construction sector. Since the political and economic reforms in 1986, Vietnam has experienced a strong economic performance. The real estate and construction sector is one of the fastest growing industries in Vietnam, accounting for approximately 7.6% of GDP in Vietnam. The aim of this study is to identify critical factors influencing the satisfaction of employees to their working place. The sample data collected was from 265 employees, managers and staff in real estate and construction companies in Vietnam. After revising the missing data, and the errors, 240 valid respondents are selected. In addition, the analysis also employs SPSS software by discussing descriptive statistics, Cronbach's alpha test, exploratory factor analysis (EFA), and regression analysis. Our empirical findings show that a company offering greater wages can positively affect the satisfaction of employees to their working place in the real estate and construction sector. In addition, a firm with a superior working relationship and working environment has a positive and statistically significant impact on the satisfaction of employees to their working place.

• Journal of Astronomy and Space Sciences
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• 제41권2호
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• pp.61-78
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• 2024

This study developed a real-time spacecraft pose estimation algorithm that combined a deep learning model and the least-squares method. Pose estimation in space is crucial for automatic rendezvous docking and inter-spacecraft communication. Owing to the difficulty in training deep learning models in space, we showed that actual experimental results could be predicted through software simulations on the ground. We integrated deep learning with nonlinear least squares (NLS) to predict the pose from a single spacecraft image in real time. We constructed a virtual environment capable of mass-producing synthetic images to train a deep learning model. This study proposed a method for training a deep learning model using pure synthetic images. Further, a visual-based real-time estimation system suitable for use in a flight testbed was constructed. Consequently, it was verified that the hardware experimental results could be predicted from software simulations with the same environment and relative distance. This study showed that a deep learning model trained using only synthetic images can be sufficiently applied to real images. Thus, this study proposed a real-time pose estimation software for automatic docking and demonstrated that the method constructed with only synthetic data was applicable in space.

• 한국동물위생학회지
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• 제35권3호
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• pp.215-222
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• 2012

Species-specific $TaqMan^{(R)}$ probe-based real-time PCR assays were developed for detection of beef, pork, chicken, duck, goose and turkey. The primer and probe sets used in this study were designed to be complementary to fibroblast growth factor (FGF) for cattle and pig, mitochondrial NADH dehydrogenase (ND) subunit 3 and ND2 for chicken and duck, 12S rRNA for goose and turkey, respectively. As internal positive control we used conserved region in the ribosomal 18S RNA gene to ensure the accuracy of the detection of target DNA by real-time PCR. We confirmed that real-time PCR assays with the primer and probe sets were positive for cattle, pig and chicken intended target animal species with no cross-reactivity with other non-target animal species. Only >50 ng DNA of beef show cross-reactivity in the determination of duck. Using species-specific primer and probe sets, it was possible to detect amounts of 0.1 ng DNA of cattle and pig, 1.0 pg DNA of chicken, duck and turkey, and 0.1 pg DNA of goose for raw samples, respectively. The detection limits were 0.1 ng DNA of cattle, 1.0 ng DNA of pig and 1.0 pg DNA of chicken for DNA mixtures (beef, pork and chicken) extracted from heat-treated ($121^{\circ}C$/5 min) meat samples. In conclusion, it can be suggested that the $TaqMan^{(R)}$ probe-based assay developed in this study might be a rapid and specific method for the identification of meat species in raw or cooked meat products.

• The Journal of Asian Finance, Economics and Business
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• 제9권4호
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• pp.307-314
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• 2022

The construction and real estate industries contribute significantly to each country's economic development. Strong construction and real estate firms will contribute more to the country's GDP by contributing to the industry's development. The purpose of this study is to examine the factors that influence the performance of the construction and real estate sectors in Vietnam. A survey of 200 construction and real estate firms in different areas was conducted from 2020 until the end of 2021. Following the removal of errors, the author got 196 replies, 6 of which were invalid, leaving 190 votes for quantitative analysis. The research findings show that elements such as (1) senior executives' commitment to the organization, and (2) the ability to use technology have a positive and significant impact on firm performance when using advanced econometric analysis. Furthermore, in the case of Hanoi, Vietnam, business relationships have a positive impact on firm performance. Training and development, as well as the working environment and incentives, have little effect on the profitability of construction and real estate firms. Finally, the research also has some recommendations and limitations for the construction and real estate sector.

• International journal of advanced smart convergence
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• 제12권3호
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• pp.25-31
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• 2023

This paper designs a real-time video playback system using a web camera in the RTSP server. It designs a function to play the video data of the web camera in the client in real time using the web camera in the server and using the RTSP protocol. It consists of a server module function that produces real-time video information using a web camera and a client module function that plays video received from the server in real time. The experiment was conducted by establishing an environment for designing a real-time video playback system using a web camera. As a result of the experiment, it was confirmed that real-time video playback from the server's web camera worked well.

• 동굴
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• 제71호
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• pp.31-34
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• 2006

• 디지털콘텐츠학회 논문지
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• 제18권6호
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• pp.1009-1015
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• 2017

최근 범죄, 테러, 교통, 보안등의 이유로 카메라의 설치가 더욱 많아짐에 따라 비디오 감시가 점점 일반화 되어가고 있다. 설치된 카메라로부터 입력된 비디오는 중앙관제센터에서 멀티스크린으로 모니터링 되고 있고, 처한 상황이나 위험 등으로부터 빠르게 대응하기 위해 실시간으로 여러 화면을 동시에 감시는 것이 필수 요소가 되고 있다. 그러나 멀티스크린 화면으로 스마트폰과 같은 모바일 환경에서 모니터링할 때, 하드웨어 스펙이나, 네트워크 대역폭의 문제로 적용되지 못하고 있다. 따라서 본 논문에서는 스마트폰 환경에서 실시간으로 멀티스크린화면을 감시할 수 있는 시스템을 제안한다. 사용자가 원하는 멀티스크린 화면을 트랜스코딩을 통해 재구성하였고, 스마트폰 환경에서 끊김 없이 복수의 카메라를 모니터링하여, 이동하면서도 감시할 수 있는 장점을 가질 수 있다.

• 한국환경보건학회지
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• 제42권3호
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• pp.189-195
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• 2016

Objectives: To ensure the microbiological safety of groundwater, it was confirmed whether waterborne pathogenic bacteria in groundwater samples tested positive for total coliforms in the Chungcheongnam-do Province region. Methods: Total colony counts, total coliforms and fecal coliforms were tested according to the process mandated by the drinking water quality testing standards of Korea. DNA was extracted from the samples, tested positive for total coliforms, and then subjected to real-time PCR to detect waterborne pathogenic bacteria. Results: A total of 115 samples were inadequate for drinking water. Thirty-one cases (27%) showed positive for fecal coliforms and nine cases (7.8%) showed total colony counts exceeding drinking water standards. Twenty-seven cases (23.5%) showed three items (total colony counts, total coliforms and fecal coliforms). Using the real-time PCR method, waterborne pathogens were detected in 57 cases (49.6%) in 115 samples. Seventy-eight cases of waterborne pathogenic bacteria were detected (including duplications): 27 cases of pathogenic E. coli (EPEC (19), ETEC (5), EHEC (1), EAEC (1) and EIEC (1)); 45 of Bacillus cereus; two of Yersinia spp.; two of Salmonella spp.; one of Staphylococcus aureus; one of Clostridium perfringens. Conclusion: The real-time PCR method can offer rapid and accurate detection of waterborne pathogenic bacteria. Therefore, this assay could be an alternative to conventional culture methods and can further ensure the microbiological safety of groundwater.