• Journal of the Korea Academia-Industrial cooperation Society
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• 제14권3호
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• pp.1213-1220
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• 2013

The purpose of this study was to identify the effect of the Smart Care ubiquitous healthcare service on hypertension management. Fifty one patients with inadequately controlled blood pressure (Systolic Blood Pressure ${\geq}$ 140 mmHg despite prescribed antihypertensive medication) from 4 local clinics participated in this study. Remote biometric monitoring and healthcare consultation via videophone was provided to the participants during 24 week - Smart Care service. The average number of blood pressure monitoring and the average day of remote consult using Smart Care Service system was 121 and 14.8 per participant. As a result of analyzing change in blood pressure during 24 weeks, there was a significant difference in blood pressure between baseline and 24 weeks. Systolic blood pressures of 86.3% participants were dropped within a normal range at 24 week. Smart Care u-health service could be effective in reducing blood pressure.

• Journal of Advanced Navigation Technology
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• 제12권6호
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• pp.619-626
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• 2008

In this paper, we proposed a RSS based cooperative localization algorithm using VRN for wireless sensor networks, which can estimate the BN position. The proposed localization system monitoring all nodes estimates a position of BN, and calculates an intersection area with cooperative localization. From the results, we confirm that BN intersection area is reduced as the number of RN is increased. In addition, the fewer RN exists, the more iteration needs at least 4 times. Moreover, the propose algorithm using 4 RNs is improved 71.6% estimation performance than conventional method. Therefore, the cooperative localization algorithm with VRN provides higher localization accuracy than RSS based conventional method.

• Korean Journal of Environment and Ecology
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• 제37권3호
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• pp.221-231
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• 2023

Great tit (Parus major) is a bioindicator species that can measure environmental changes in urban ecosystems and plays an important role in maintaining health as a representative insectivorous bird. Researchers have utilized artificial nest box surveys to understand the reproductive ecology of the Paridae family of birds, including the Great tits, but it is difficult to conduct a macroscopic study due to spatial and temporal limitations. This study designed and applied a citizen-participatory monitoring of artificial nest boxes project to transcend the limitations of expert-centered monitoring methods. The Suwon Front Yard Bird Monitoring Team installed artificial nest boxes in green spaces in Suwon, Gyeonggi Province and observed the reproductive ecology of the Paridae family through the participation of voluntary citizen surveyors. Participants were recruited through an online survey from February 9 to February 22, 2021, and they directly performed from installation to observation of artificial next boxes from February 23 to August 31, 2021. Online education was provided to the volunteers for the entire monitoring process to lower the entry barrier for non-expert citizen surveyors and collect consistent data, and observation records were collected through a mobile app. A total of 98 citizen surveyors participated in the citizen-participatory monitoring of artificial nest boxes project, and 175 (84.95%) of the 256 distributed artificial nest boxes were installed in green spaces in Suwon City. Among the installed artificial nest boxes, the results of the citizen science project were confirmed for 173 (83.98%), excluding two boxes with position coordinate generation errors. A total of 987 artificial nest box observation records were collected from citizen surveyors, with a minimum of one time, a maximum of 26 times, and an average of 5.71±4.37 times. The number of observations of artificial birdhouses per month was 70 times (7.09%) in February, 444 times (44.98%) in March, 284 times (28.77%) in April, 133 times (13.48%) in May, 46 times (4.66%) in June, 6 times (0.61%) in July, and 4 times (0.41%) in August. Birds using the artificial nest boxes were observed in 57 (32.95%) of the 173 installed artificial nest boxes, and they included Great tit (Parus major) using 12 boxes (21.05%), Varied Tit (Parus varius) using 7 boxes (12.28%), and unidentified birds using 38 boxes (66.67%). This study is the first to consider citizen participation in the monitoring of artificial nest boxes, a survey method for the reproductive ecology of the Paridae family, including Great tits, and it can be utilized as basic data for the design of ecological monitoring combined with citizen science in the future.

• Journal of Korean Society of Environmental Engineers
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• 제38권10호
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• pp.558-565
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• 2016

Water quality data including flow rates and BOD/COD/T-N/T-P/SS/TOC concentrations in Nakdong river tributaries were analyzed to determine priority management areas using 699 data sets from 195 locations in 2015. It was pointed out that the coefficients of variation, the ratio of the standard deviation to the mean, for the concentrations and loading rates of BOD, T-P, and TOC in each monitoring location were so large that average values of water quality monitoring data might be not appropriate to determine the priority management areas among all 195 monitoring stations in Nakdoing river. Therefore we suggested two evaluation methods using each water quality data independently. In the first method the excess numbers of the BOD, T-P, and TOC concentrations comparing to the water quality standards in the medium-sized management areas in Nakdong river was evaluated for each monitoring station. In the second method the percentile ranks of the loading rates of the BOD, T-P, and TOC were obtained for each monitoring data. The two groups of the priority management areas determined by each method were compared and the water quality characteristics in Nakdoing river were investigated.

• Journal of the East Asian Society of Dietary Life
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• 제26권6호
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• pp.507-516
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• 2016

The salinity of soups of institutions enrolled at the Center for Children's Foodservice Management was monitored to reduce sodium intake of children by continuously managing salinity of soups provided by children food service. Monitoring of salinity was conducted by a salinity meter (SB-1500H, HM digital) three times in 2016 by patrolling children's institutions for the instruction of public health. The average salinity of soups provided by total children's institution showed a significant decrease in salinity - $1^{st}$ 0.45%, $2^{nd}$ 0.41% and $3^{rd}$ 0.39% - as monitoring was proceeded (p<0.01). When salinity of soups was analyzed according to the type of children's institution, the salinity of national and public institutions showed no significant decrease. In contrast, the salinity of private institutions decreased significantly (p<0.05). Depending on the enrollment of the food service, there was no significant difference in average salinity of soups between large food services, which have over 50 children, and small food services, which have less than 50 children. However, all food services showed a salinity decrease from the $1^{st}$ monitoring to the $3^{rd}$ monitoring. Salinity according to the type of soup showed that salinity of clear soup, miso soup, and stew except beef soup decreased from the $1^{st}$ monitoring to $3^{rd}$ monitoring. However, there was no significant difference in salinity according to the type of soup which can be attributed to a large difference in salinity among the same type of soup. The individual soup showing the biggest difference between maximum and minimum salinity of soup was egg soup (0.62%), potato soup (0.54%), and mushroom soup (0.64%). The present average salinity of soup provided by children's institutions was less than 0.5% which is the recommended standard of the Ministry of Food and Drug Safety. However, the salinity of soups should be managed within a certain range including the minimum salinity regarding the taste education of children.

• Disaster Prevention Review
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• 제15권2호
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• pp.126-133
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• 2013

최근 기상이변으로 가뭄과 홍수, 폭설 등 자연재난이 전 세계적으로 빈번하게 발생하고 있고, 우리나라도 예외는 아니어서 일 강수량이 300mm가 넘는 집중폭우의 횟수도 증가하고 있다. 특히 지난 해 한반도 지역의 아열대성 기후변화로 인해 잦은 국지성 폭우와 태풍 등 물재해로 인명과 재산피해가 점증하고 있다. 2012년 7월에 발생한 제7호 태풍 '카눈'을 시작으로 잇따른 초대형 태풍 '덴빈', '볼라벤', '산바'는 태풍이 북상하여 중부지방 중심 전국적으로 많은 비를 내렸으며 경기 및 강원 북부 일부 지방은 관측 강우량을 경신하였다. 홍수기 시 수자원 운영에 미치는 댐, 보 수문자료의 활용을 통해 홍수분석 등에 활용됨으로써 홍수분석 의사결정 시 신속하게 대응할 수 있는 물 관리 시스템에 대한 요구가 높아지고 있는 실정이다. 이에 K-water에서는 최신 ICT 기술을 융합한 "실시간 수자원정보시스템"을 구축 운영하여 24시간 365일 상시 모니터링함으로써, 2012년에 과거 유래 없는 4개의 대형 태풍이 한반도에 상륙하였을 때에도 안정적으로 시스템을 운영하면서 신속하게 대응할 수 있었다.

• Proceedings of the Korea Water Resources Association Conference
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• 한국수자원학회 2010년도 학술발표회
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• pp.1211-1215
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• 2010

국내의 석탄자원은 1989년부터 비경제 탄광은 폐광시키고 경제성 있는 탄광을 육성하는 석탄산업 합리화시책을 실시하여, 전국 343개의 탄광이 폐광되어 현재는 5개의 탄광만이 가행되고 있다. 이들 가행광산중 강원도 삼척시 도계읍에 위치한 채탄작업을 위한 갱구 입구의 작업지역(DCM, Dogye coal mine)을 선정하여 강우 유출수 모니터링을 시행하였다. DCM지역의 수문분석 결과 연강우량의 83%는 일 강우 80 mm 이하에서 발생하였다. 또한 연강우량의 50% 이상이 40 mm 이하의 강우계급에서 발생하고 있는 것으로 나타났다. 연간 강우횟수는 약 90회 정도 발생하고 있으며, 평균적으로 4일에 1회의 강우가 발생하였다. 또한 100 mm 이상의 강우도 연평균 강수량의 13.78%를 차지하고 있어 집중호우가 총 강우량에 미치는 영향이 작지 않음을 나타냈다. 비점오염의 배출은 강우량에 의해 영향을 많이 받기 때문에 기상이변으로 게릴라성 집중호우가 많이 발생하는 요즘 큰 강우사상에 대하여 많은 대비를 해야 할 것으로 판단되었다.

• Proceedings of the Korean Information Science Society Conference
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• 한국정보과학회 2007년도 한국컴퓨터종합학술대회논문집 Vol.34 No.1 (B)
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• pp.451-454
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• 2007

오늘날 많은 임베디드 시스템이 배터리를 통해 전력을 공급한다. 이처럼 제한적인 배터리 용량 때문에 임베디드 소프트웨어는 개발 시에 전력소비를 고려하여 디자인하여야 한다. 이와 같은 이유로 최근 저전력 디자인과 소프트웨어 소비전력 분석 및 분석에 대한 연구가 두드러지게 진행되고 있다. 측정 기반 전력 소모 분석 기법의 대표적인 부류인 명령어 수준 전력 분석 기법이 CPU와 메모리의 전력 소비만을 고려하는 점을 보안하기 위하여 본 논문에서는 시스템 전체의 소비 전력을 분석하기 위하여 이벤트 방식의 전력 소모 분석 기법을 제안한다. 사용자는 소비전력을 모니터링하고 싶은 코드 구간에 대해 이벤트로 지정하고 해당 이벤트가 발생하는 동안 소비되는 전력을 DAQ 장비로부터 측정한 후 결과를 바탕으로 소프트웨어의 수행시간, 소비전력량, 전력소비 병목현상, 커널 이벤트의 발생 빈도 및 횟수 등을 파악하여 소프트웨어의 성능을 계층적으로 분석할 수 있는 데이터를 제공한다.

• Journal of Broadcast Engineering
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• 제14권2호
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• pp.114-126
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• 2009

In this paper, we propose a PSNR(peak-to-peak signal to noise ratio) estimation method exploiting visual rhythm information for the reconstructed video frames at the customer's STB(Set-top Box). Key idea is that we can estimate the PSNR by using VR(visual rhythm) information even though a VR consists of the pixels in a vertical direction of a 2D(2-dimensional) video frame, because VR is the 1D projected version of a 2D video frame approximately. Simulation results show that the estimated PSNR from VR information is closely related to the PSNR from 2D video frames. The advantages of the proposed scheme includes that it can monitor the video quality efficiently while minimizing the computation load of STB, and show the location, duration and occurrence count of severe picture degradation.

• Journal of the Korea Institute of Information and Communication Engineering
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• 제8권7호
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• pp.1524-1531
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• 2004

This study analyzes a load balancing technique using Round Robin Algorithm. The study uses two software packages (Packet Capture and Round Robin Test Package) to check packet volume from Virtual Network structure (data generator, virtual server, Server1,2,3), and finds out traffic distribution toward Server1,2 and 3. The functions of implemented Round Robin Load Balancing Monitoring System include round robin testing, system monitoring, and graphical indication of data transmission and packet volume. As the result of the study shows, Round Robin Algorithm allows servers to ensure definite traffic distribution, unless incoming data loads differ much. Although error levels are high in some cases, they were eventually alleviated by repeated tests for a long period of time.