• Environmental Engineering Research
• /
• 제10권2호
• /
• pp.71-78
• /
• 2005

A series of column experiments was conducted to develop a monitoring system for in-situ and realtime measurement of ozone transport in unsaturated porous media using a fiber optic sensor. The calibration of the fiber optic transflection dip probe (FOTDP) system was successfully carried out at various ozone concentrations using a column with length of 30 cm and diameter of 5 cm packed with glass beads, which don't react with gaseous ozone. The breakthrough curves (BTCs) of ozone were obtained by converting the normalized intensity into ozone concentration. The FOTDP system worked well for in-situ monitoring of gas phase ozone at various water saturations and in presence of soil organic matter (SOM). However, the FOTDP system did not measure the ozone concentration at more than 70% water saturation.

• Journal of Microbiology
• /
• 제33권2호
• /
• pp.142-145
• /
• 1995

The pumb gene encoding a basic amino acid transport protein in Neurospora crassa could be cloned by using a mutant strain defective in pmb gene as a host strain, using a negative selection on the media containing amino acid analogue canavanine. To select positive transformants of the genes for cloning, an auxotrophic marker (his-2) was added to a pmb mutant strain by mating ; a triple mutant (pmn : pmb : his-2) was constructued by crossing a strain defective in basic amino acid transport system (# 1683-bat um 535 "A") to a double mutant strain defective in neutral amino acid transport and histidine production (mitrol : his-2 "a"). Crossing was performed on synthetic crossing (SC) media containing histidine. The pmn : pmb and pmn :pmb : his-2 strains were selected among the progeny colonies from crosses on plates containing 5- .mu.g/ml para-fluoro-phenylalanine (PFPA), 200 .mu.g/ml canavanine, and 500 .mu.g/ml histidine. The selected colonies were cultured on minimal media with or without histidine for discarding pmn : pmb strain, because the pmn : pmb : his -2 strain grows only on histidine containing media. The pmn :pmb : his-2 strain selected can be used as a host strain for the cloning of the pmb and the pmn genes from a Neurospora genomic library by means of positive selections.

• ETRI Journal
• /
• 제26권3호
• /
• pp.203-217
• /
• 2004

This paper presents a method and architecture to analyze streaming media and multimedia conferencing traffic. Our method is based on detecting the transport protocol and port numbers that are dynamically assigned during the setup between communicating parties. We then apply such information to analyze traffic generated by the most popular streaming media and multimedia conferencing applications, namely, Windows Media, Real Networks, QuickTime, SIP and H.323. We also describe a prototype implementation of a traffic monitoring and analysis system that uses our method and architecture.

• Advances in environmental research
• /
• 제4권2호
• /
• pp.105-117
• /
• 2015

The groundwater is a very important part of the environment and must be protected for the benefit of the present and future generation. The contamination of soil and groundwater by chemicals has become an increasing concern in the recent past. These chemicals enter the groundwater system by a wide variety of mechanisms, including accidental spills, land disposal of domestic and industrial wastes and application of agricultural fertilizers. Once introduced into an aquifer, these contaminants will be transported by flowing groundwater and may degrade water quality at nearby wells and streams. For improving the management and protection of groundwater resources, it is important to first understand the various processes that control the transport of contaminants in groundwater. Predictions of the fate of groundwater contaminants can be made to assess the effect of these chemicals on local water resources and to evaluate the effectiveness of remedial actions. In this study, an attempt has been made to investigate the behaviour of solute transport through porous media using laboratory experiments. Sodium chloride was used as a conservative chemical in the experiment. During the experiment, pulse boundary condition and continuous boundary conditions were used. Experimental results have been presented for conservative solute transport in the sand. The pattern of the break through curve remains almost same in all the cases of varying flow rate and initial concentration of conservative chemical.

• 한국위성정보통신학회논문지
• /
• 제10권2호
• /
• pp.54-59
• /
• 2015

UHD(Ultra High Definition) 방송은 초고선명 비디오와 다채널 오디오 재현으로 최근 관심이 높아지고 있다. 그런데 UHD 방송 서비스를 제공하기 위해서는 지상파 현재 방송 시스템으로는 대역폭, 인코딩 등 해결해야할 기술적인 어려움이 있다. 이러한 문제를 해결하기 위한 방안 중 하나로 MMT(MPEG Media Transport)가 제안되었다. MMT는 UHD와 같은 초고화질의 대용량 멀티미디어를 방송할 수 있는 표준으로, IP를 기반으로 구성되어 있기 때문에 다른 종류의 여러 망을 동시에 사용하여 전달할 수 있다는 특징이 있다. MMT를 기반으로 미디어 데이터를 계층적으로 분리하여 이기종망을 통해 전송하면 현재 방송 시스템으로도 UHD 미디어 서비스가 가능하다. 그러나 MMT를 이용하여 계층화된 UHD 미디어 데이터가 서비스되기 위해서는 이기종망을 통해 들어오는 데이터들이 시그널링을 통해 관리되어야 하고, 수신기가 계층구조에 대한 정보를 빨리 전달받을 수 있어야 빠른 화면 구성 및 제공이 가능하기 때문에 이를 위한 정보가 시그널링 내에 존재해야 한다. 따라서 본 논문에서는 현재 MMT 내에 정의되지 않은 이기종망에 대한 정보를 적절하게 제공하는 시그널링 테이블 구조 설계를 제안한다.

• 한국농공학회논문집
• /
• 제48권7호
• /
• pp.55-63
• /
• 2006

Bacterial transport models were evaluated in this study to determine the suitable model at describing bacterial transport in saturated column experiments. Four models used in the evaluation were: advective-dispersive equation (ADE) + equilibrium sorption/retardation (ER) + kinetic reversible sorption (KR) (Model I), ADE + two-site sorption (Model 2), ADE + ER + kinetic irreversible sorption (KI) (Model 3), ADE + KR + KI (Model 4). Firstly, analyses were performed with the first experimental data, showing that Model 4 is appropriate for describing bacterial transport. Even if Model 1 and 2 fit well to the observed data, they have a defect of not including the irreversible sorption, which is directly related to mass loss of bacteria. Model 3 can not properly describe the tailing observed in the data. However, further analysis with the second data indicates that Model 4 can not describe retardation of bacteria, even if the sorption-related parameters are varied. Therefore, Model 4 is modified by incorporating retardation factor into the model, resulting in the improved fitting to the data. It indicates that the transport model, into which retardation, kinetic reversible sorption, and kinetic irreversible sorption are incorporated, is suitable at describing bacterial transport in saturated column experiments. It is expected that the selected transport model could be applied to properly analyze the bacterial transport in saturated porous media.

• 스마트미디어저널
• /
• 제13권5호
• /
• pp.26-32
• /
• 2024

본 논문은 스마트 글래스 기반 응급원격의료지도 시스템을 제안한다. 여기서, 원격의료지도 시스템이란 병원의 전문의사가 현장의 해양경찰이나 응급구조사에게 원격의료지도를 수행할 때 사용하는 시스템을 의미한다. 시스템 개발에 필요한 요구사항을 파악하기 위해 관련 기술 동향 및 사례를 분석하였다. 분석을 바탕으로 3가지 시스템 요구사항(1. 환자 수송의 필요성을 결정할 수 있어야 함, 2. 병원으로 수송 중 응급 의료 제공에 도움을 주어야 함, 3. 의료 시설로 환자 정보 전달이 가능해야 함)을 정의하였다. 그리고, 요구사항을 충족하는 프로토타입을 개발하고 사용성 평가를 수행하였다.

• Nuclear Engineering and Technology
• /
• 제27권1호
• /
• pp.1-7
• /
• 1995

다공성 매질을 통한 방사성 핵종의 콜로이드에 의한 이동을 실험과 새로운 모델을 도입하여 살펴보았다. 본 실험에서는 기존의 컬럼 슬라이스 방법을 개선하기 위하여 비파괴 스캐닝 시스템을 개발하였다. 이 장치를 이용하여 기존의 방법보다 훨씬 많은 핵종이동에 관한 자료를 측정하였다. 중성자조사를 시킨 진흙 입자와 여기에 방사성 핵종을 흡착시켜 콜로이드 입자를 만들었다. 실험결과 콜로이드 입자의 크기 분포에도 불구하고 콜로이드 여과계수는 2개의 그룹으로 명백히 구분되었다. 이를 모사하기 위하여 2개의 파라미터를 이용한 새로운 모델식이 개발되었고, 모델식은 실험결과를 잘 모사하였다. 흡착된 핵종중 $^{137}$Cs은 주로 콜로이드 형태로 이동하였으나 $^{Sr}$ 은 그렇지 않았다.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2006년도 춘계학술대회논문집
• /
• pp.380-383
• /
• 2006

The media transport system is used in a printer, a ATM(Automated Tellor Machine), and so on. The media transport system has many problems through miniaturization and rapid transportation of these machines. In the paper feeding mechanism, it is important to feed the sheet without jamming under any conditions. To avoid sheet jamming, first we need to predict the behavior of the sheet exactly. In this paper, the analysis of media behavior is based on J. Stolte's studies. In all of OA machines, a flexible beam or plate is pushed from the channel. The motion may be constrained by guides. This leads to a transient and geometrically nonlinear problem. The behavior of paper is simulated by dynamic elastica theory. The shape of guide is represented by parametric cubic curve. But J. Stolte's studies did not considered contact condition between sheet and guide. So Klarbring's Model. will be applied. And the analysis of flexible media has to include aerodynamic effect for more exact behavior analysis, because the flexible media can be deformed drastically by a little force. Therefore aerodynamic force must be applied to the governing equation. Lastly, the simulation of this model is performed, and the experiment is performed for verification of this model. The experimental results of low exit velocity are consistent with the simulation results, however experimental results of high exit velocity do not agree well with analytical results. The reason is that there may be other effects like nip Phenomena

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2010년도 추계학술대회
• /
• pp.66-69
• /
• 2010

최근 차량에는 차량과 IT와 결합을 차량의 안전성, 편리성을 위해 많은 전자제어장치(ECU)가 장착되어 있고 있다. 이러한 전자제어장치는 각 전자제어장치에 대한 Data는 OBDII 네트워크에 전송을 하고 멀티미디어에 대한 Data 는 MOST 네트워크에 전송을 한다. 본 논문에서는 기존의 블랙박스의 문제점을 보완하기 위해 차량용 네트워크의 새로운 멀티미디어 네트워크인 MOST 차량용 네트워크와 현재 차량에서 표준적으로 쓰이는 OBDII 차량용 네트워크를 이용하여 전자제어장치의 데이터를 이용한 Data들을 취합하여 차량의 현재 상황을 판단하고 정보를 제공함으로써 차량의 안전성 및 블랙박스로써의 역할을 극대화 시킬 수 있는 차량용 블랙박스 시스템을 구현하고자 한다.