• 문화기술의 융합
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• 제7권3호
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• pp.335-342
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• 2021

이 연구에서는 어린이급식소에서의 ATP bioluminescence 분석법을 이용한 급식 위생관리 모니터링의 적합성을 확인하고자 하였다. 어린이집과 유치원 두 유형 간을 비교하였을 때, 측정구역별 ATP 측정값, 위생관리 적합률, 획득점수와 측정 횟수별 획득점수에서는 차이가 없었다. 어린이집과 유치원 각각을 비교했을 때는, 어린이집에서의 측정구역별 ATP 측정값은 대부분 1차시보다 2차시에 낮아졌으나, 유치원은 차시 간 차이가 없었으며, 측정구역별 위생관리 적합률은 어린이집과 유치원에서 대부분 1차시보다 2차시에 높아졌다. 또한, 어린이집의 경우 측정 횟수와 평균 획득점수와의 양의 상관관계를 보였다. 결론적으로, ATP bioluminescence 분석법은 어린이급식소에서의 급식 위생관리 모니터링 도구로써 활용 가능할 것으로 보이며, 특히, 어린이집이 유치원보다 더 효과적일 것으로 판단된다.

• 한국안전학회지
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• 제21권6호
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• pp.1-6
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• 2006

Subway platform is divided into Side-platform type and Center-platform type. In this study does quantitative fire risk assesment of subway platform types in numerical analysis by using CFD model. From the result of this study, 1) All exhaust mode was low-end result it seems most fire risk at Side-platform station. 2) All exhaust mode was low-end result it seems most fire risk at Center-Platform station. 3) When comparing same type exhaust mode of Side-platform and Center-platform that last thing was visible $9.1{\sim}72.34%$ low-end fire risk. Center-platform is more opera-tive than Side-platform that reduce fire risk when that was same dimension and external environment. Designer look upon a fire characteristic of subway platform types when he make smoke control air volume and platform area design.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회B
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• pp.2989-2994
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• 2008

The shopping center in underground passage for efficient space utilization is increased in urban area. This study describes operation characteristics of HVAC systems with ventilation and individual heating and cooling unit for shopping center in underground passage. In order to compare energy saving, thermal environment and installation space, etc., an integrated simulator with heat production and distribution system was designed and constructed. Energy delivery efficiency is improved over 20%, and energy saving of the hybrid system is calculated as over 30% compared to conventional all air type in the case of heating. And also the results showed that humidity decreased about $5{\sim}6%$, also characteristics of thermal control is improved over 34%.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.783-788
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• 2003

In this paper, we present a new approach to detect and recognize human face in the image from vision camera equipped on the mobile robot platform. Due to the mobility of camera platform, obtained facial image is small and pose-various. For this condition, new algorithm should cope with these constraints and can detect and recognize face in nearly real time. In detection step, ‘coarse to fine’ detection strategy is used. Firstly, region boundary including face is roughly located by dual ellipse templates of facial color and on this region, the locations of three main facial features- two eyes and mouth-are estimated. For this, simplified facial feature maps using characteristic chrominance are made out and candidate pixels are segmented as eye or mouth pixels group. These candidate facial features are verified whether the length and orientation of feature pairs are suitable for face geometry. In recognition step, pseudo-convex hull area of gray face image is defined which area includes feature triangle connecting two eyes and mouth. And random lattice line set are composed and laid on this convex hull area, and then 2D appearance of this area is represented. From these procedures, facial information of detected face is obtained and face DB images are similarly processed for each person class. Based on facial information of these areas, distance measure of match of lattice lines is calculated and face image is recognized using this measure as a classifier. This proposed detection and recognition algorithms overcome the constraints of previous approach [15], make real-time face detection and recognition possible, and guarantee the correct recognition irregardless of some pose variation of face. The usefulness at mobile robot application is demonstrated.

• Journal of Power Electronics
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• 제15권5호
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• pp.1305-1317
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• 2015

Distributed generation systems (DGSs) have been getting more and more attention in terms of renewable energy use and new generation technologies in the past decades. The self-excited induction generator (SEIG) occupies an important role in the area of energy conversion due to its low cost, robustness and simple control. Unlike synchronous generators, the SEIG has to absorb capacitive reactive power from the outer device aiming to stabilize the terminal voltage at load changes. This paper presents a novel static VAR compensator (SVC) called a magnetic energy recovery switch (MERS) to serve as a voltage controller in SEIG powered DGSs. In addition, many small scale SEIGs, instead of a single large one, are applied and devoted to promote the generation efficiency. To begin with, an expandable mathematic model based on a d-q equivalent circuit is created for parallel SEIGs. The control method of the MERS is further improved with the objective of broadening its operating range and restraining current harmonics by parameter optimization. A hybrid control strategy is developed by taking both of the stand-alone and grid-connected modes into consideration. Then simulation and experiments are carried out in the case of single and double SEIG(s) generation. Finally, the measurement results verify that the proposed DGS with SVC-MERS achieves a better stability and higher feasibility. The major advantages of the mentioned variable reactive power supplier, when compared to the STATCOM, include the adoption of a small DC capacitor, line frequency switching, simple control and less loss.

• 대한원격탐사학회지
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• 제29권3호
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• pp.315-324
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• 2013

Spatial information of snow cover and depth distribution is a key component for snowmelt runoff modeling. Wide snow cover areas can be extracted from NOAA AVHRR or Terra MODIS satellite images. In this study eight sets of annual snow cover data (1997-2006) in two mountainous watersheds (A: Chungju-Dam and B: Soyanggang-Dam) were extracted using NOAA AVHRR images. The distribution of snow depth within the Snow Cover Area (SCA) was generated using snowfall data from ground meteorological observation stations. Snow depletion characteristics for the two watersheds were analyzed snow distribution time series data. The decreased pattern of SCA can be expressed as a logarithmic function; the determination coefficients were 0.62 and 0.68 for the A and B watersheds, respectively. The SCA decreased over 70% within 10 days from the time of maximum SCA.

• 한국수산과학회지
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• 제43권6호
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• pp.687-692
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• 2010

The mass cultivation of Ecklonia cava Kjellman was studied as a potential biomass source for the extract industry in Korea. Experiments were conducted to investigate the optimal conditions for artificial seed production and mass cultivation of this species. Maximum growth and young thalli development in the nursery culture area occurred at 2 m depth, whereas maximum growth of thalli in the main culture area occurred at 1 m depth. Production of E. cava was between 2.6 and 3.6 kg wet wt. $m^{-1}$ after depth control and removal of fouling organism, etc. The relationship between optimal water depth for culture and underwater irradiance during the E. cava cultivation was calculated as: y = -0.718x + 8.042 ($r^2$=0.976). The growth rates achieved in this trial indicate that E. cava cultures could produce and supply sufficient biomass.

• Animal Bioscience
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• 제36권6호
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• pp.861-868
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• 2023

Objective: Loin muscle area (LMA) is an important target trait of pig breeding. This study aimed to identify single nucleotide polymorphisms (SNPs) and genes associated with LMA in the Duroc×(Landrace×Yorkshire) crossbred pigs (DLY). Methods: A genome-wide association study was performed using the Illumina 50K chip to map the genetic marker and genes associated with LMA in 511 DLY pigs (255 boars and 256 sows). Results: After quality control, we detected 35,426 SNPs, including six SNPs significantly associated with LMA in pigs, with MARC0094338 and ASGA0072817 being the two key SNPs responsible for 1.77% and 2.48% of the phenotypic variance of LMA, respectively. Based on previous research, we determined two candidate genes (growth hormone receptor [GHR] and 3-oxoacid Co A-transferase 1 [OXCT1]) that are associated with fat deposition and muscle growth and found further additional genes (MYOCD, ARHGAP44, ELAC2, MAP2K4, FBXO4, FBLL1, RARS1, SLIT3, and RANK3) that are presumed to have an effect on LMA. Conclusion: This study contributes to the identification of the mutation that underlies quantitative trait loci associated with LMA and to future pig breeding programs based on marker-assisted selection. Further studies are needed to elucidate the role of the identified candidate genes in the physiological processes involved in LMA regulation.

• 농촌의학ㆍ지역보건
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• 제25권1호
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• pp.99-112
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• 2000

본 조사는 행정구역 통합과 보건기관 시설 및 장비 개선이라는 변화를 겪고 있는 일개 통합 시 지역주민의 보건기관 이용경험과 보건서비스 요구도를 파악하여 지역사회에 적합한 보건사업계획에 필요한 자료를 얻고자 실시하였다. 조사 대상은 1995년 9월 현재 통합 구미시에 거주하는 86,305가구(284,775명) 중 읍 면 동 직원이 가정 방문하여 설문지로 방문 시 면접 가능했던 가구주 혹은 주부와 면담 조사했다. 분석 대상은 결측치가 있는 설문을 제외한 통합 전 도시 지역 67,607가구(220,187명) 중 3,337가구(4.9%)와 통합 전 농촌지역 18,698가구(64,588명) 중 690가구(3.7%)로 총 4,027가구(전체 가구의 4,6%)였다. 조사내용은 응답자의 건강관련 인구학적 특성과 응답자의 보건소 이용경험, 보건서비스에 대한 요구도, 보건지소 및 보건진료소의 필요성 등이다. 응답자의 성 연령 구성, 의료보장, 현주소지에 거주기간, 교육수준 등 건강관련 인구학적 특성에 대해 통합 전 도시와 농촌 지역간에 유의한 차이가 있었다. 급성질환 및 만성질환 유부 빈도는 농촌에서 모두 높았으며 급 만성질환 시 보건기관 이용률도 농촌지역에서 높았다. 과거 한번 이상 보건소를 이용한 경험률은 도시지역주민 64.8%, 농촌지역주민 55.6%이고, 이용한 보건의료서비스는 도시지역은 예방접종, 농촌지역은 일반진료가 가장 많고, 보건소 사업 중 가장 강화되기 바라는 사업은 양쪽 지역 모두 전염병 예방사업이었다. 순회진료 및 가정간호서비스에 대한 찬성률은 90%이상이고 보건지소와 보건진료소에 기대하는 사업은 노인을 중심으로 건강상담이 가장 많았다. 농촌지역에서는 보건지소에 대하여 90.3%가 필요한 것으로, 보건진료소에 대하여 88.3%가 필요하다고 답하였고, 도시지역에서는 주민의 86.0%가 도시 보건지소 설치가 필요하다고 답하였다. 위의 결과에 따르면 지역주민들은 보건기관이 지속적으로 필요하다고 생각하나 그 주 기능은 기존의 전염병관리사업으로 인식하고 있다. 도시지역은 예방접종을, 농촌지역은 일반진료를 위해 보건기관을 가장 많이 이용하고 있으며 보건교육, 건강상담, 순회진료, 가정간호서비스 등을 많이 기대하고 있다. 따라서 지역주민의 보건기관 이용률을 높이기 위해서는 도시지역과 농촌지역의 보건관련 인구학적 특성과 주민의 요구에 적합한 보건사업을 개발하여 추진하고 보건사업의 질적 향상을 꾀하여야겠다.

• 전기학회논문지
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• 제63권2호
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• pp.266-271
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• 2014

The Electromagnetic Interference(EMI) generating from corona discharge of transformer area can interference the digital Instrument and Control(I&C) systems located nearby transformers. When the potential gradient of the electric field around the conductor is high enough to form a conductive region but not high enough to cause electrical breakdown to nearby objects, the EMI of corona discharge emits with the conducted and radiated noise and it interferences the signals of the I&C systems. Since digital I&C systems have an efficiency and competitive price, the analog I&C systems have been upgraded and displaced with the digital I&C systems but which have less EMI Immunity. There was no assessment to I&C systems by EMI generating corona discharge nearby transformers. When the safety-related I&C systems are installed in plants, the verification of equipment EMI should be done not in site-specific test but in test facilities. There are the need to do the site-specific EMI evaluation of corona discharge nearby transformers. This paper assesses the margin between plant emission limits and the highest composite plant emission of corona. When the non safety-related I&C systems are placed in transformer area, it suggests the appropriate radiated susceptibility level to EMI of corona discharge.