• 한국산업정보학회논문지
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• 제15권2호
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• pp.23-30
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• 2010

본 논문은 WCDMA, HSDPA 및 WiBro와 같은 광역무선통신망 기반의 V2I2V 차량통신시스템을 구현하여 차량통신시스템의 실제 도로주행 실험을 통해 이동차량과 위치관리서버 사이의 다양한 성능인자에 대한 실험적 성능을 측정하였다. GPS가 탑재된 이동차량 내 클라이언트와 각 이동차량의 위치 추적을 위한 위치 관리 서버 사이의 RTT, 종단간 전달지연 및 기타 성능인자들을 측정하였다. 이동차량이 도심지에서의 운행 시 차량의 이동속도별, 광대역통신망의 종류별 성능인자들을 측정하고 분석하였다. 본 연구 결과는 광역무선통신망 기반의 차량통신시스템을 이용한 서비스 지원 시, 차량통신을 이용한 교통 안전정보 서비스의 지원 가능성을 판단할 수 있는 기초 자료로 활용할 수 있을 것이다.

• 대한환경공학회지
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• 제34권3호
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• pp.168-176
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• 2012

2011년 3월에 대구광역시의 대형유통업소주차장을 대상으로 총 48개의 먼지시료를 채취하여 100 ${\mu}m$ 이하로 걸러서 산추출한 후 ICP로 14개 원소를 분석하였다. 미량원소성분 중 Ca, Fe, K, Mg, Mn, Na, V는 자연적 발생원의 영향을, 그리고 Cd, Cr, Cu, Ni, Pb, Zn은 인위적 발생원의 영향을 받는 것으로 추정된다. 미량원소성분의 농도는 자연적 발생원 성분이 인위적 발생원 성분보다 뚜렷하게 높았고, 인위적 발생원 성분은 지상옥상이 지상실내와 지하실내보다 농도가 높았다. 미량원소성분의 조성백분율은 인위적 발생원 성분에 비해 자연적 발생원 성분이 대부분을 차지하였고, 인위적 발생원 성분은 지상옥상이 지상실내와 지하실내보다 함유율이 높았다. 주차장은 유해중금속오염이 거의 없는 수준을 보였고, 지상옥상은 지상실내와 지하실내보다 중금속오염도가 높았다. 미량원소성분간의 상관성은 지상옥상이 지상실내와 지하실내보다 양호한 상관성이 많았고, 인위적 발생원 성분은 주차장연수와 주차밀도와도 상관성이 양호하였다.

• 한국환경복원기술학회지
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• 제7권1호
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• pp.116-127
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• 2004

The objectives of this study are to build up the concept of Environment-Oriented Land Suitability Assessment(EOLSA) and to develop the EOLSA mapping system by applying the EOLSA criteria to the case study area. In order to draw out the EOLSA critera, this study adopted the Delphi method including the experts' awareness survey to urban planners as well as environmental researchers in May and June 2001. As a result, the concept of EPLSA was defined as a process of land use planning to scientifically assess the physical and environmental value of land and to classify conservation aptitude into several grades for the sustainable management of environmental resources. With an outcome of applying the EOLSA criteria with five degrees to the Seoul Metropolitan Area (SMA), Grade I, indicating the highest conservation value, accounted for 57.76% of the SMA. Then, Grade II reached up to 15.06%, Grade III 3.12%, Grade IV 15.92%, and Grade V, the lowest conservation value, 7.99% respectively. And also, the case analysis showed that the share of Grade I area was the highest in Gapyong county and Yangpyong county, Pochon county, Yeonchon county, Yongin city in the order and the lowest in Kwangmyong city, Osan city, Kunpo city, Kuri city, and Buchon city.

• 한국환경과학회:학술대회논문집
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• 한국환경과학회 2006년도 학술발표회 발표논문집
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• pp.380-381
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• 2006

정보과학기술의 발달 등으로 미래도시는 많은 변화가 예상되며, 이로 인한 여러 가지 부정적인 영향도 예측되고 있어 개인적이고 비인간적인 사회출현도 우려된다. 그러나 지금까지의 도시발달과 흐름을 살펴볼 때 급격한 사회변화에 대한 역기능에 대해 방어수단을 마련하고자 근린체계가 잘 조성된 쾌적하고, 안전하며, 그리고 무엇보다도 좀 더 인간적인 모습을 갖추기 위한 다양한 노력이 시도될 것이다. 향후 미래도시에서는 보다 인간적이고 커뮤니티가 활성화된 도시를 구축하기 위해 공원녹지도 중요 수단의 하나가 될 것으로 보인다. 미래도시 유형의 하나인 V-CITY의 발전방향을 예측하고 살펴봄으로써 공원녹지의 바람직한 발전방향을 마련해야 할 것이다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.363-366
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• 1988

A new $NH_{3}-O_{2}$ oxidation method was estimated by the electrical properties of the fabricated n-MOS transistor. For the C-V characteristic curves the Qox are almost equal to Qss and no hysteresis phenomena are observed. The Id-Vds characteristics show that $NH_{3}-O_{2}$ oxidation method is superior to Dry oxidation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.367-369
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• 1988

We suggest a new annealing method for stabilization of $Si-SiO_2$ interface state in MOS device using $NH_3$(10%) + $N_2$(90%) ambient gases. The annealing effect was examined through C-V characteristics, threshold voltage, effective mobility on channel, respectively. The experimental result show that the new method is available to improvement of MOS device characteristics.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 학술대회 논문집 전문대학교육위원
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• pp.72-74
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• 2002

In this paper, we showed the erosion characteristics of MgO protector layer releated to lifetime of plasma display panel(PDP). We observed MgO erosion characteristic as a functions of deposition conditions. In RIE condition of Xe gas, the lowest erosion rate appears in the conditions of no heating, bias voltage -30V and pressure 5mtorr. In general. as deposition rate increases, erosion rate decreases.

• 한국미생물·생명공학회지
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• 제49권2호
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• pp.181-191
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• 2021

The present study addresses isolation, optimization, partial purification, and characterization of a haloalkaline serine protease from a newly isolated haloarchaeal strain isolated from Wadi El Natrun in Egypt. We expected that a two-step sequential statistical approach (one variable at a time, followed by response surface methodology) might maximize the production of the haloalkaline serine protease. The enzyme was partially purified using Hiprep 16/60 sephacryl S-100 HR gel filtration column. Molecular identification revealed the newly isolated haloarchaeon to be Natrialba hulunbeirensis strain WNHS14. Among several tested physicochemical determinants, casamino acids, KCl, and NaCl showed the most significant effects on enzyme production as determined from results of the One-Variable-At-A-time (OVAT) study. The BoxBehnken design localized the optimal levels of the three key determinants; casamino acids, KCl, and NaCl to be 0.5% (w/v), 0.02% (w/v), and 15% (w/v), respectively, obtaining 62.9 U/ml as the maximal amount of protease produced after treatment at 40℃, and pH 9 for 9 days with 6-fold enhancement in yield. The enzyme was partially purified after size exclusion chromatography with specific activity, purification fold, and yield of 1282.63 U/mg, 8.9, and 23%, respectively. The enzyme showed its maximal activity at pH, temperature, and NaCl concentration optima of 10, 75℃, and 2 M, respectively. Phenylmethylsulfonyl fluoride (PMSF, 5 mM) completely inhibited enzyme activity.

• Clinical and Experimental Pediatrics
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• 제63권4호
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• pp.119-124
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• 2020

A cluster of severe pneumonia of unknown etiology in Wuhan City, Hubei province in China emerged in December 2019. A novel coronavirus named severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) was isolated from lower respiratory tract sample as the causative agent. The current outbreak of infections with SARS-CoV-2 is termed Coronavirus Disease 2019 (COVID-19) by the World Health Organization (WHO). COVID-19 rapidly spread into at least 114 countries and killed more than 4,000 people by March 11 2020. WHO officially declared COVID-19 a pandemic on March 11, 2020. There have been 2 novel coronavirus outbreaks in the past 2 decades. The outbreak of severe acute respiratory syndrome (SARS) in 2002-2003 caused by SARS-CoV had a case fatality rate of around 10% (8,098 confirmed cases and 774 deaths), while Middle East respiratory syndrome (MERS) caused by MERS-CoV killed 861 people out of a total 2,502 confirmed cases between 2012 and 2019. The purpose of this review is to summarize known-to-date information about SARS-CoV-2, transmission of SARS-CoV-2, and clinical features.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 E
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• pp.1731-1733
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• 1997

The first 150lkV underground transmission line of Korea was installed between Danginri and Yongsan substation in 1974. Since then, the underground transmission lines of about 720 circuit-km had been installed up to 1995. As the national economy has been enlarged and the population of city has been rapidly increased, the demand of an electric power has been very increased. Therefore the first 345kV long-length transmission line of Korea was installed between Mikyum and Sungdong substation on Jan., 1997. This paper describes the design of the 345kV oil-filled cable and its accessories, the design of the system, the methods of installation, field tests, and the future trends of the underground transmission line in Korea.