• 대기
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• 제18권2호
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• pp.97-109
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• 2008

The aerosol characteristics in terms of 4 different cases (Asian dust, fog, clear sky and cloud) which had happened at Anmyeon Island in April 2006 were studied using various measurements such as the Micro Pulse Lidar (MPL), sunphotometer, $\beta$-ray $PM_{10}$ Analyzer, anemoscope and anemometer. In addition, synoptic charts, back trajectory analyses and satellite images were also used to help characterize the aerosol events. The aerosol optical properties were featured by the Aerosol Optical Depth (AOD) and ${\AA}ngstr\ddot{o}m$ exponent which were estimated by the sunphotometer. When Anmyeon Island was dominated by the Asian dust, the AOD was sharply increased as seven times as a yearly average of it (0.35). As compared with a yearly average of the ${\AA}ngstr\ddot{o}m$ exponent of 0.97, the ${\AA}ngstr\ddot{o}m$ exponent of a dust day was significantly low (0.099). In addition, $PM_{10}$ mass concentration showed an extremely high record. The maximum concentration reached $1790.5{\mu}gm^{-3}$ on 8 April 2006. The maximum mass concentration was shown with delay when the wind speed of $0ms^{-1}$ was observed. It was also found that a satellite image of the MODIS-RGB had a good agreement with the results of those measurements. It was shown that the MPL was able to describe effectively the vertical distribution of aerosol for all the cases. In particular, the MPL evidently captured the aerosol layer before the cloud observation. The aerosol layer was similarly described by the AOD. On a clear sky day, the AOD had not only a very low value (0.054) but also a feature of homogeneity.

• 한국대기환경학회지
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• 제20권5호
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• pp.697-711
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• 2004

Severe haze, mist, and fog phenomena occurred in the central part of Korea during 15~25 May 2003 resulted in poor visibility and air quality. When these phenomena occurred, Korean peninsula was under the effects of anticyclone. The atmosphere was stable, and wind speed was so weak. Under this meteorological conditions, air quality was worse and worse. The characteristics of aerosol in Seoul, Incheon, and Gosan (Jeju) during this period are investigated from the $PM_{10}$. TSP concentrations and aerosol number concentrations. Concentrations of $PM_{10}$ and TSP measured at KMA increased upto 176 and 230 J.${\mu}g/m^3$ on 22 May 2003, respectively. Aerosol number concentrations of size range from 0.82 to 6.06 ${\mu}m$ increased in Seoul on 17, 19, and 21~24 May 2003, and the concentrations of $NO_2$ and $SO_2$had maximum value of 0.165 ppm at Gwanak Mt. and 0.036 ppm at Guro-dong on 23 May 2003, respectively. Result from analysis on heavy metal elements showed high concentrations of Zn, Pb, Cr, Ni, Cu, and Cd during 20~24 May 2003. This event is examined by comprehensive analyses of synoptic weather conditions, satellite images, concentrations of suspended particles and air pollutants, and heavy metal elements.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 E
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• pp.1670-1674
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• 1998

Now and then there are many electrical accidents between cable and line post insulator which is degraded by long time using, causing leakage current on the surface of insulator. In this paper it is denied that the 22.9 KV-y distribution lines are protected by binding cover which is needed from fog or rainy moisture, surges occurring by swiching or lightening pulse. It is analyzed to investgate the unballanced transfer characteristics and reflection coefficient by using bidding cover and non-cover. It was tested the radio interference voltage in the test room. In the factory it was tested the amount of leakage current causing on the surface of insulator in the state of no load and 70(%) load.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 C
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• pp.1871-1873
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• 2000

There are many electrical accidents between bare wire and line post insulator which is degraded by long time using, causing leakage current on the surface of insulator. In this paper it is presented that the 22.9 Kv-y distribution lines are protected by binding cover which is needed from fog or rainy moisture, surges occurring by switching or lightening pulse. It is analyzed to investigate the unbalanced transfer characteristics and reflection coefficient by using binding cover and non-cover. It was tested the radio interference voltage in the test room and electric field strength by calculation between binding cover and non-cover. In the factory the leakage current causing on the surface of insulator was tested in the state of light load and heavy load.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제9권11호
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• pp.247-249
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• 2020

4차 산업혁명 시대에 다양한 분야에서 ICT 기술 간 융합에 대한 요구가 증가하고 있다. 이에 마쳐 데이터, 네트워크, 인공지능 기술이 결합한 새로운 용어인 DNA(Data, Network, AI)가 사용 중이다. DNA는 지능형 응용 및 서비스 개발에 있어 잠재적 기술력을 가지고 있다. 이에 본 논문에서는 DNA 기술 기반의 논리적 포그 네트워크 기반의 서비스 이미지 배치 기술, 산업용 무선 센서 네트워크에서의 기계학습 기반 이동성 기술, 뇌신호 주파수 특성을 이용한 CNN 기반 BCI 성능 예측 기술, 소스코드 주제를 이용한 인공신경망 기반 경고 분류 방법 기술, 챗봇 환경에서 데이터 시각화 인터랙션을 위한 자연어처리 기술에 대한 심사 완료된 논문들을 소개한다.

• 한국지구과학회지
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• 제33권3호
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• pp.233-241
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• 2012

가강수량과 구름물량의 시공간적 분포와 특성을 분석하기 위해 청주, 합천, 대관령에서 마이크로웨이브 라디오미터의 관측을 수행하였다. 각 지역에서 관측된 가강수량을 검증하기 위해 고층자료에서 산출된 가강수량과 비교하였으며 그 결과 상관계수가 0.8 이상으로 좋은 상관도를 보인다. 청주, 합천, 대관령 지역의 가강수량의 계절적인 변동과 일변화는 유사하게 나타났으며 일반적으로 1000 LST부터 증가하기 시작하여 1900 LST에 극대 값을 보인다. 반면에 구름물량은 지역적으로 계절적인 차이를 보인다. 이는 평지에 위치한 청주, 소백산맥으로 인한 편서풍 구름 차폐가 발생하기 쉬운 합천, 안개 및 구름이 잦은 대관령(834 m 해발고도) 등 각기 다른 지형 및 지리적 영향에 기인한 것으로 사료된다.

• 한국환경과학회지
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• 제21권9호
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• pp.1087-1095
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• 2012

The investigation was made about distribution and ecological characteristics of host plant for Phellinus linteus at habitats in Gangwon-Do. The habitats of P. linteus are the place where the fog is much generated and there is lots of the moisture. The flora of the vascular plants in P. linteus habitats were consisted of 76 taxa; 62 species, 10 varieties and 4 formas of 62 genera of 40 families. The plants of infiltration type were found 70% around P. linteus habitats. This results shows that the natural environments of P. linteus habitat is very stable condition. The categories of vegetation were classified into two types. The host plant for P. linteus appeared 61.6% from Populus tomentiglandulosa. The first type showed up above the sea about 600m and west exposure region. The second type was investigated around the facing north region of the steep slope-land.

• 원예과학기술지
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• 제30권2호
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• pp.129-136
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• 2012

왕벚나무 성목(43-58년생)의 삽목묘 대량증식 방법을 밝히기 위해 삽목시기별, 옥신처리별 및 삽수부위별로 자동안개관수장치가 설치된 무가온 비닐하우스에 삽목을 실시했으며, 삽목묘의 가로수 식재 성공여부를 검토하기 위해 발근된 삽목묘를 묘포장에 이식하여 생육특성을 조사하였다. 각 처리에 따른 평균 발근율의 분산분석 결과는 고도의 유의성($P$ < 0.0001)이 나타났다. 시기별 평균 발근율에서 6월 1일의 삽목(61.4%)이 8월 1일(23.6%)보다 2배 이상 높아 6월 1일이 적합한 시기로 나타났다. 발근율이 가장 좋은 옥신 처리는 IBA $1,000mg{\cdot}L^{-1}$와 IBA $500mg{\cdot}L^{-1}$ 처리에서 각각 90.8%, 89.2%로 나타났으며, 발근율에 대한 각 처리간의 상호효과($P$ < 0.0001)가 인정되었다. 삽수부위에서 상단부 + IBA $1,000mg{\cdot}L^{-1}$ 처리가 발근율 96.7%로 가장 높게 나타났다. 삽목묘의 묘포장 이식 활착률 역시 옥신처리간에 고도의 유의성($P$ < 0.0001)이 인정되었으며, 잎이 있는 삽목묘의 평균 이식활착률은 46.5%로 낮았으나 IBA $1,000mg{\cdot}L^{-1}$ 처리는 79.2%로 높았다. 그러나 잎이 없는 삽목묘의 이식활착율은 8.7%로 대부분 고사하였다. 활착된 삽목묘와 접목묘 및 실생묘의 생장특성을 비교한 결과, 생장(수고, 근원경), 뿌리수, 가지수, 잎수 등에서 고도의 유의성($P$ < 0.0001)이 나타났으며 삽목묘가 월등히 우수하였다. 본 연구의 결과는 자동안개관수장치로 안정적인 습도조절과 온도유지가 가능한 삽목실에서 6 - 7월의 삽목실시, 상단부 삽수의 선택, IBA처리 및 8월에 발근된 삽목묘의 묘포장 이식을 통해 개량된 왕벚나무의 대량증식과 성공적인 가로수 식재가 가능할 것이다.

• Journal of Biosystems Engineering
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• 제27권4호
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• pp.317-326
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• 2002

Characteristics of a twin-fluid spray with ultrasonic vibration were examined in order to obtain a high efficiency of cold-fog spray of the automatic pest control machine which has been widely used in protected horticulture recently. An electrostrictive vibrator of PZT BLT and a magnetostrictive $\pi$-type vibrator were used applied as the ultrasonic transducers with a frequency of 28 kHz. All experiments were conducted in 4 methods of spray ; a conventional spray method without ultrasonic forcing, an indirect vibration method with ultrasonic forcing, an improving-quality method by ultrasonic forced within liquid, and a combined-use method with both of the indirect vibration method and the improving quality method. It was found that the ultrasonic energy increased the atomization efficiency of spray droplets about 10% and especially much more in the case of the combined-use method.

• 대한방사선기술학회지:방사선기술과학
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• 제6권1호
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• pp.43-67
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• 1983

In order to increase the sensitivity of the photographic emulsion, one of the chemical sensitizers hydroxymethane sulfonic acid sodium salt(HMS) was applied through the chemical ripening process and following four types of emulsion were prepared. Their grain sizes were determined through the electron microscope. The ranges of average grain sizes were $0.05-0.40{\mu}m$ for silver chlorobromide emulsion of low sensitivity $0.10-0.45{\mu}m$ for the silver chlorobromide emulsion of medium sensitivity, $0.60-1.05{\mu}m$ for the silver iodobromide emulsion of high sensitivity, and $0.90-1.55{\mu}m$ for the ammonical silver iodobromide emulsion of high sensitivity. Through the reduction sensitization with HMS, they showed significant sensitivity enhancement by the increment of HMS concentration above pH 5.5 and pBr 3.0. Required sensitivity was obtained above pH 6.2 and pBr 3.3 when sulfur and gold sensitization were applied. Fog formed along the reduction sensitization was successfully prevented by the addition of 5.5-dimethylhydantion.