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서해상에 발생하는 Cloud Streets에 동반된 2003년 1월 4일 강설의 레이더관측사례 분석
신기창 ( Ki Chang Shin ),류찬수 ( Chan Su Ryu ) 한국환경과학회 2010 한국환경과학회지 Vol.19 No.10
The formation and development conditions of the cloud streets over the yellow sea by the Cold Surge of Siberian Anticyclone Expansion which produce the heavy snowfall events over the southwestern coast, Honam District of the Korean peninsula, has been investigated through analyses of the three dimensional snow cloud structures by using the CAPPI, RHI, VAD and VVP data of X-band Radar at Muan Weather Observatory and S-band Radar at Jindo Weather Station. The data to be used are obtained from January 04, 2003, when heavy snow storm hits on Gwangju and Honam District. The PPI Radar images show that the cloud bands distribute in perpendicular to the expansion direction of the high pressure and that the radius of cloud cells is about 5~8 km with 20~30 dBz and distance between each cell is about 10 km. And but the vertical Radar images show that the cloud street is a small scale convective type cloud within height of about 3 km where a stable layer exists. From the VVP images, the time period of the high pressure expansion, the moving direction and development stages of the system are delineated. Finally, the vertical distribution of wind direction is fairly constants, while the wind speed sheer increases with altitude to 3 km.
申基昌 전남대학교기업경영연구소 1990 經營情報 Vol.1 No.2
기능인력의 양성은 우리의 경제발전, 국제경쟁력 제고 등과 직결되어 있는 중요한 문제인 만큼 대단히 신중하고도 장기적인 안목에서 그 수급대책이 마련되어야 할 것이다. 이러한 측면에서 정부가 시행하고 있는 많은 사업들 중에서 사업내직업훈련의 활성화 필요성을 언급하지 않을 수 없다. 현재까지 직업훈련 배출인력의 48.1%를 차지해온 사업내직업훈련은 산업이 발전함에 따라 산업사회에서 필요로 하는 기능인력의 수요가 날로 증가하여 인력의 원활한 공급이 어려운 상황에 공공 및 인정직업훈련과는 달리 기업체에서 필요로 하는 기능인력을 기업체 스스로 양성·충원토록 하는 제도로, 산업구조의 고도화와 기술혁신으로 필요한 기능인력 수요를 정규학교 교육과정만으로는 충족시킬 수 없고 더구나 국가예산으로 모든 분야에서 필요로 하는 기능인력을 일괄적으로 양성·공급한다는 것이 사실상 불가능한 차제에, 생산현장에 보다 쉽게 적응할 수 있는 기능인력을 신속히 보충할 수 있으며 사업체내의 기존시설·장비·자재 등을 활용함으로써 훈련경비를 절감할 수 있는 이점이 있다. 또한 생산현장의 경험이 풍부한 자체인원을 훈련교사로 활용함으로써 훈련이 효과적으로 이루어질 수 있는 것이다. 다시 말해서 사업내직업훈련은 양·질적 면에서 수급의 원활화를 기할 수 있고 경제적 측면에서 효과적 이며 생산성 제고를 가져올 수 있는 제도인 것이다.
김영학,신기창,Bolotnikov Aleksey,이원호 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.5
The virtual Frisch-grid method for room-temperature radiation detectors has been widely used because of its simplicity and high performance. Recently, side electrodes were separately attached to each surface of the detectors instead of covering the entire detector surface with a single electrode. The side-electrode structure enables the measurement of the three-dimensional (3D) gamma-ray interaction in the detector. The positional information of the interaction can then be utilized to precisely calibrate the response of the detector for gamma-ray spectroscopy and imaging. In this study, we developed a 3D position-sensitive 5 5 12 mm3 cadmium-zinc-telluride (CZT) detector and applied a flattening method to correct detector responses. Collimated gamma-rays incident on the surface of the detector were scanned to evaluate the positional accuracy of the detection system. Positional distributions of the radiation interactions with the detector were imaged for quantitative and qualitative evaluation. The energy spectra of various radioisotopes were measured and improved by the detector response calibration according to the calculated positional information. The energy spectra ranged from 59.5 keV (emitted by 241Am) to 1332 keV (emitted by 60Co). The best energy resolution was 1.06% at 662 keV when the CZT detector was voxelized to 20 20 10.
장마전선상에서 하층제트 유입으로 인한 집중호우에 관한 연구
최지영,신기창,류찬수 조선대학교 기초과학연구원 2011 조선자연과학논문집 Vol.4 No.1
In general, heavy rainfall in Korea is mostly associated with inflow of 850hPa low-level jet. It transports abundant heat and moisture flux to the Changma front. In this study, synoptic characteristics of heavy rainfall in Korea from a case study is examined by classifying heavy rainfall cases with synoptic patterns, in particular distribution of upper- and low-level jets, western North Pacific high, and moisture flux. The surface and upper-level weather charts including auxiliary analysis chart and radar and satellite images obtained from the Korea Meteorological Administration, and 500hPa geopotential heights from NCEP/NCAR are used and then KLAPS is applied to understand the local atmospheric structure associated with heavy rainfall. Results show that maximum frequency in 60 heavy rainfall cases with more than 150mm/ day appears in the Changma type of 43 cases (a proportion in relation to a whole is 52%) including the combined Changma types with typhoon and cyclone. As indicated in previous studies, most heavy rainfall cases are related to inflow of low- level jet. In addition, synoptic characteristics based on the analyses of weather charts, radar and satellite images, and KLAPS in heavy rainfall case of 12 July, 2009 reveal that the atmospheric vertical structure in particular equivalent potential temperature favorable for effective inflow of warm and moist southwesterly into the Changma front is linked to large potential instability and the strong convergence accompanied with low-level jet around Suwon contributes to atmospheric upsliding along the Changma front, producing heavy rainfall.