• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.965-968
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• 2007

Two major parameters, i.e. carbon dioxide ($CO_2$) and particulate matters smaller than $10{\mu}m\;(PM_{10})$, were selected as the index pollutants in managing indoor air quality. The former pollutant, $CO_2$, is the index that shows the ventilation status and is exhaled by passengers when they breathe in train or subway. It is generally known that high $CO_2$ concentration in the vehicle may be decreased by insufficient air-tightening vehicle bodies and the air is ventilated when vehicles stop at the station and doors open. However, there is no established proof or quantitatively identified data on how much the $CO_2$ concentration is reduced when ventilation is done while doors are opened. In this study, $CO_2$ concentrations were measured in 6 lines of Korail and one line of Seoul Metro subway linesand a theoretical approach was takento predict the changing trend of $CO_2$ concentrations during the operation of vehicle by using $CO_2$ dilution factor through natural ventilation. As a result, the change could be quantified and it was found that app. 35% of indoor $CO_2$ was removed through natural ventilation.

• Asian-Australasian Journal of Animal Sciences
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• 제26권10호
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• pp.1374-1378
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• 2013

Based on a quantitative traits locus (QTL) study using a $F_2$ intercross between Landrace and Korean native pigs, a significant QTL affecting teat numbers in SSC7 was identified. The strong positional candidate gene, TBC1D21, was selected due to its biological function for epithelial mesenchymal cell development. Sequence analysis revealed six single nucleotide polymorphisms (SNPs) in the TBC1D21 gene. Among these, two SNP markers, one silent mutation (SNP01) for g.13,050A>G and one missense mutation (SNP04) for c.829A>T (S277C), were genotyped and they showed significant associations with teat number traits (p value = 6.38E-05 for SNP01 and p value = 1.06E-07 for SNP04 with total teat numbers). Further functional validation of these SNPs could give valuable information for understanding the teat number variation in pigs.

• 농촌계획
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• 제21권1호
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• pp.19-28
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• 2015

As environmental concerns including climate change drive the strong regulations for car exhaust emissions, electric vehicles attract the public eye. The purpose of this study is to identify rural areas vulnerable for charging infrastructures based on the spatial distributions of the current gas stations and provide the target dissemination rates for promoting electric cars. In addition, we develop various scenarios for finding optimal way to expand the charging infrastructures through the administrative districts data including 11,677 gas stations, the number of whole national gas stations. Gas stations for charging infrastructures are randomly selected using the Monte Carlo Simulation (MCS) method. Evaluation criteria for vulnerability assessment include five considering the characteristic of rural areas. The optimal penetration rate is determined to 21% in rural areas considering dissemination efficiency. To reduce the vulnerability, the charging systems should be strategically installed in rural areas considering geographical characteristics and regional EV demands.

• The Plant Pathology Journal
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• 제31권1호
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• pp.41-49
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• 2015

Sweet cherry is an important fruit crop with increasing economical value in Turkey and the world. A number of viruses cause diseases and economical losses in sweet cherry. Prune dwarf virus (PDV), is one of the most common viruses of stone fruits including sweet cherry in the world. In this study, PDV was detected from 316 of 521 sweet cherry samples collected from 142 orchards in 10 districts of Isparta province of Turkey by double antibody sandwich-enzyme linked immunosorbent assay (DAS-ELISA). The presence of PDV in ELISA positive samples was confirmed in 37 isolates by reverse transcription- polymerase chain reaction (RT-PCR) method. A genomic region of 862 bp containing the coat protein (CP) gene of PDV was re-amplified from 21 selected isolates by RT-PCR. Amplified DNA fragments of these isolates were purified and sequenced for molecular characterization and determining genetic diversity of PDV. Sequence comparisons showed 84-99% to 81-100% sequence identity at nucleotide and amino acid level, respectively, of the CP genes of PDV isolates from Isparta and other parts of the world. Phylogenetic analyses of the CP genes of PDV isolates from different geographical origins and diverse hosts revealed that PDV isolates formed different phylogenetic groups. While isolates were not grouped solely based on their geographical origins or hosts, some association between phylogenetic groups and geographical origins or hosts were observed.

• 대한원격탐사학회지
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• 제32권5호
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• pp.511-527
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• 2016

본 연구는 실내 영상을 저비용으로 취득할 수 있는 회전식 스테레오 프레임 카메라 시스템을 제안하고 이를 이용해 생성한 실내 3차원 모델의 정확도를 평가하였다. 하나의 실험 대상지를 선정하여 제안한 시스템과 토탈스테이션을 이용하여 각각 영상과 기준점 데이터를 취득하였다. 취득한 데이터로부터 다양한 조합의 입력 데이터를 상용 사진측량 소프트웨어로 처리하여 실내 3차원 모델을 생성하였다. 생성된 모델을 정성적, 정량적인 분석을 통해 제안한 시스템을 이용한 실내 3차원 모델링 가능성을 평가하였다. 그 결과 제안한 시스템을 이용하여 생성한 실내 3차원 모델은 높지 않은 정확도를 요구하는 실내 서비스에 활용될 수 있을 것으로 보인다.

• 한국농공학회지
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• 제24권1호
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• pp.53-62
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• 1982

This study was attempted to find best fitted distribution and the equations for probable maximum flow with the evaluation of parameters by the method of moment for the rat- ional design of hydraulic structures in the annual exceedance series. Six subwatersheds were selected as studying basins along Geum River basin. The results obtained through this study were analyzed and summarized as follows. 1. Fitted probability distribution was showed in the order of Three Parameter Lognorm al, Type 1 Extremal, Exponential, Pearson Type III, and Log Pearson Type I distribu- tion as the results of x$^2$ goodness of fit test. 2. Kolmogorov-Smirnov test showed in the order of Three Parameter Lognormal, Exp- onential' Pearson Type III, Log Pearson Type III and Type 1 Extremal distribution for the fitted probability distribution. 3. It can be concluded that Three parameter Lognormal distribution is a best fitted one among some other distributions out of respect for each both tests. An Exponential distribution was proposed as a suitable one by Chow, V.T. showeci lower fittness than that of Three Parameter Lognormal in Geum River basin. 5. Probable flood flow equations followins the return periods for each station were obt- ained by Three Parameter Lognormal distribution. 6. It is urgently essential that best fitted probability distribution should be established for the annual exceedance series in the main river systems of Korea.

• 한국컴퓨터정보학회논문지
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• 제7권2호
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• pp.130-135
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• 2002

본 논문에서는 구조적인 장점 때문에 최근 초고주파 소자에 많이 사용되고 있는 코플러너 웨이브가이드를 사용하여 대역통과 필터를 이동통신 기지국용 모듈형태로 설계.제작하였다. Itoh의 Conductor-Backed Coplanar Waveguide를 이용하였으며. 각 단의 임피던스를 실제로 제작이 가능한 잎피던스 값을 갖도록 파라미터 H를 2.4로 선택하여 계산하였다. 선로의 길이는 $\lambda$/4인 코멘슈레이트 선로를 사용하였으며, 접지면 사이의 간격을 고정하고 신호선의 폭을 구하였다. 설계된 필터는 마이크로스트립 필터보다 적은 공간을 차지하면서 예리한 차단특성과 통과대역 전 대역의 return loss가 15dB인 우수한 특성을 얻을 수 있었다.

• Nuclear Engineering and Technology
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• 제47권1호
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• pp.66-73
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• 2015

Background: A numerical simulation was carried out to investigate the difference between internal and external heat-flux distributions at the reactor vessel wall under in-vessel retention through external reactor vessel cooling (IVR-ERVC). Methods: Total loss of feed water, station blackout, and large break loss of coolant accidents were selected as the severe accident scenarios, and a transient analysis using the element-birth-and-death technique was conducted to reflect the vessel erosion (vessel wall thickness change) effect. Results: It was found that the maximum heat flux at the focusing region was decreased at least 10% when considering the two-dimensional heat conduction at the reactor vessel wall. Conclusion: The results show that a higher thermal margin for the IVR-ERVC strategy can be achieved in the focusing region. In addition, sensitivity studies revealed that the heat flux and reactor vessel thickness are dominantly affected by the molten corium pool formation according to the accident scenario.

• 한국컴퓨터정보학회논문지
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• 제24권8호
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• pp.123-129
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• 2019

This study selected all patients with acute poisoning carried by the 119 emergency services in K-Province from January 1 to December 31, 2015 for complete enumeration. The subjects were 1,627 patients who were classified as poisoning suspected in chemicals and animal/insect poisoning by Rescue Emergency Activity Information System(Emergency Statistics) in fire-fighting portal system of K-province fire-fighting officers. The 119 activity journals were analyzed retrospectively. The major results are as follows. Regarding the demographic characteristics of the elderly and the non-elderly, the most people were unemployed in the elderly group, other job, the non elderly group about their occupations and in both groups, the most people lived in rural areas about their living places. Regarding the poisoning characteristics of the elderly and the non-elderly, the most causing substance was bee sting about the poisoning causing substances and most of patients didn't get drunken about drunken state in both group. Regarding the time factors of the elderly and the non-elderly, both groups had the most accidents in afternoon about the poisoning time and in summer about the seasonal distribution.

• 한국응급구조학회지
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• 제25권1호
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• pp.159-175
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• 2021

Purpose: This study aimed to obtain, categorize, and analyze baseline data regarding the subjective perception of ambulances from the consumers' perspective, which can be utilized for improving emergency medical service systems. Methods: Fifty people aged 20 to 40 years old were selected as P samples. Data from 35 statements of Q-cards and Q-sample distribution plots were gathered using Q-sort and analyzed using the PC-QUANL program for major factor analysis. Results: We found four unique characteristics which accounted for 57.57% of the total variation: "Considerate of emergency situations," "Identifying emergency patients," "Trusting emergency vehicles," and "Sympathizing with emergency patients." Conclusion: Organizations that provide emergency medical services using ambulances should plan and render patient care according to the four types of public perception of ambulances.