農業系高等學校 學生들의 農高 選擇 動機

강대구,이선하 順天大學校 師範大學 附屬 科學敎育硏究所 1994 科學과 敎育 Vol.2 No.-

To find a way to secure enough numbers of agricultural high school students, 355 agricultural high school students were polled on their motivation of entering the agricultural high school. Almost half of the students chose the school according to their poor academic grades and only 29% students entered properly the school to learn farming. The students preferred engineering technical high school, commercial high school to agricultural high school among vocational high schools. Since most of the students want to enter college, giving privilege in entering agricultural college could be an incentive method to make more students to choose agricultural high school.

한국 ITS 산업과 학회의 발전방안

이선하 한국ITS학회 2018 ITS Brief Vol.9 No.2

동백의 生長과 花芽形成에 미치는 Paclobutrazol의 影響

이선하 順天大學校 師範大學 附屬 科學敎育硏究所 1993 科學과 敎育 Vol.1 No.-

본 실험은 동백나무의 화분재배 증대를 도모하는 데 있어서 식물의 矮性化와 꽃눈형성에 미치는 paclobutrazol 의 영향을 알아 보기 위하여 동백나무 新梢生長基에 삽수(C.japonica)와 1년생 삽목묘 (C. japonica, C. sasanqua, C. vernalis)에 paclobutrazol과 다른 植物生長調節劑를 농도별로 분무처리하여 新梢長과 꽃눈수를 조사하였다. paclobutrazol에 대한 동백나무 삽수와 삽목묘의 반응은 비슷했다. Gibberellin 처리 식물이 新梢生長이 촉진되고 꽃눈형성이 억제된 데 반하여 paclobutrazol 처리 식물은 꽃눈 형성이 촉진되고 生長이 억제되었다. 효과적인 처리농도는 250ppm이었다. 세 種別 반응에서는 비슷한 경향으로 뚜렷한 차이가 없었다. The effects of various growth regulators including paclobutrazol on flower bud formation and growth of Camellia species were determined. The length of shoots and the number of flower buds formed were measured after the treatment of cuttings (C. japonica) and pot plants (C. japonica, C. sasanqua, C. vernalis) with various concentrations of growth regulators. The responses of the cuttings and the pot plants to paclobutrazol were similar to each other. Paclobutrazol stimulated flower bud formation and inhibited growth of shoots, while gibberellin inhibited flower bud formation and stimulated growth of shoots. The effective concentration of paclobutrazol was 250ppm.

원예교육 평가 방법의 새로운 방향

이선하 한국원예학회 1997 원예과학기술지 Vol.2 No.4

탄화규소 세라믹 필터를 이용한 여과기술에 관한 연구

이선하,이동섭 경운대학교 산업기술연구소 2000 産業技術硏究論文誌 Vol.3 No.1(B)

Candle type SiC filters applicable to hot gas filtration of IGCC and PFBC were manufactured and tested using two different dusts collected from cokes and water glass manufacturing processes. Particle sizes, porosities, and mean pore sizes of manufactured SiC filters range 150∼300㎛, ∼40%, and 43∼83㎛, respectively. Collection efficiencies of two different types of dusts rage 99.09∼99.95% at 600℃ and latm test condition. At the same condition, Darcy's resistance coefficients rage 1.149×10^10∼3.514×10^11m^-2 and differential pressures range 187∼391㎜H₂O. Also it was found that the smaller the mean pore size, the higher the differential pressure at the same operating conditions. SiC filters have high potential as a fine dust removal medium from HTHP processes like PFBC and IGCC. Furthermore, long-term performance tests of the filters are necessary for the commercialization of SiC filters.

자화-생물처리에 의한 염색폐수의 처리

이선하,차승훈,김재현 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(A)

The purpose of this study is to investigate treatment efficiency in dyeing wastewater treatment by the high rate aeration system(HRA) and a combination of the HRA with manetized wastewater treatment system(MWS). At the hydraulic retention time of 16hr, 24hr, 30hr, BOD removal efficiencies of HRA system were 93%, 96% and 98%, combination of the HRA with MWS system were 94%, 96.8% and 98.2%, resoectively. In case of COD, at the hydraulic retention time of 16hr, 24hr, 30hr, COD removal efficiencies of HRA system were 66%, 77.1% and 83.1%, combination of the HRA with MWS system were 70.2%, 80.1% and 86.6%, resoectively. The comparison of the HRA and combination of the HRA with MWS, effluent BOD of the former was 22.7㎎/ℓ and the latter was 19.4㎎/ℓ, therefore biological treatment efficiency identified to increase by the MWS

제강 집진 dust에 포함된 염분제거에 관한 연구 : Batch type에 의한 염소이온농도 변화 collection dust

이선하,김재현,박영서 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(A)

This study was conducted batch-type process to remove chlorine for using sub-raw material of cement, dust generated from steel manufacture-collection process. According to increasing reaction time of the dust and extraction solvent, chlorine-extraction of dust was increased slowly, but concentration of Hg, Cd, Mn, Fe were increased too. At the reaction time 2hr, in case of the ratio of 1:1 in dust and extraction solvent, chlorine-extraction concentration was maximum. At the same condition, filtration and drying repeated 7 times. And polymer 30㎎/ℓ was added that chlorine concentration of dust was 850㎎/ℓ.

지상포럼 : 행정도시건설과 연계한 충청권 교통체계 발전방향

이선하 충남발전연구원 2006 열린충남 Vol.34 No.-

제강 집진 dust에 포함된 중금속제거에 관한 연구

이선하,김재현,박영서 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(B)

This study was conducted continuous-type process to remove heavy metals for dust generated from steel manufacture-collection process. According to increasing ratio of the dust and extraction solvent, heavy metal-extraction of dust was increased slowly, and extracted heavy metals(Cr, Cd etc.) were under the water quality standard of effluent, except for Pb metal.

Multi-Regime에 의한 돌발상황 시 교통류 분석

이선하,강희찬 한국ITS학회 2005 한국ITS학회논문지 Vol.4 No.1

본 연구는 점유율, 교통량, 속도 등의 실시간 교통자료의 시계열 분석, 교통기초도 상 실측자료의 통계적 모형화와 교통류의 다영역 구분에 의한 교통정체의 전개 양상을 규명하였다. 천안-논산고속도로의 교통사고와 행사로 인한 교통정체 시의 검지기 자료를 바탕으로 시계열 분석을 수행한 결과 교통사고와 같이 급격히 도로 콩량이 감소하는 경우 사고 직후 점유율의 변화로부터 용이하게 추정할 수 있었다. 행사와 같은 교통량 증가로 인한 교통정체의 경우 점유율과 평균속도의 변화 폭이 완만하며, 충격파의 형태가 다양하여 단순한 교통지표들의 시계열적 분석에 의한 검지의 신속성과 정확성에는 어려움이 있는 것으로 나타났다. 실측자료의 통계적 모형화에 있어서 안정교통류일 경우 점유율과 교통량 관계는 1차 선형식으로 매우 높은 신뢰도로 설명되었다. 그러나 속도와 점유율간의 관계에 있어서는 운전자들의 희망속도에 대한 넓은 폭원으로 인하여 나타나는 군집형태가 통계적 모형으로 표현되기에는 어려운 것으로 나타났다 그러나 이 경우 점유율 6-8대를 중심으로 속도가 급격히 떨어지는 현상이 발생하였다. 불안정 교통류 상황의 경우 교통정체의 형성과 해소과정이 각기 하나의 영역 내에서 분석됨에 따라 전반적으로 통계적 모형의 적용이 어려운 것으로 나타났다. 안정과 불안정 2영역 구분에 의한 교통정체 형성과 해소과정의 해석이 어려운 점을 감안하여 다영역 구분에 의한 교통류를 시계열에 의하여 분석한 결과 사고시의 교통류는 바로 정지단계(stopped flow)로 전이되며 점유율이 급격히 증가하였으며, 교통류가 stooped flow에서 free flow로 회복될 때 급격히 증가된 점유율이 점진적으로 감소하면서 교통량이 증가하는 추세를 나타냈다. 교통혼잡시의 교통류는 impeded free flow 상황에서 congested flow 상황을 거쳐 jammed flow 상황으로 전개되는 등 사고에 의한 정체 형성 및 해소과정보다 매우 복잡하며, 동일한 점유율에 대하여 교통상태별로 교통량의 차이가 큰 현상이 명확하게 발생하였다. 본 연구는 교통류 분석 시 다영역 구분의 필요성을 제시하였으며, 향후 개별 교통영역에 대한 정량적 구분 및 모형화가 이루어져야 할 것을 제기하였다. This research has examined a time series analysis(TSA) of an every hour traffic information such as occupancy, a traffic flow, and a speed, a statistical model of a surveyed data on the traffic fundamental diagram and an expand aspect of a traffic jam by many Parts of the traffic flow. Based on the detected data from traffic accidents on the Cheonan-Nonsan high way and events when the road volume decreases dramatically like traffic accidents it can be estimated from the change of occupancy right after accidents. When it comes to a traffic jam like events the changing gap of the occupancy and the mean speed is gentle, in addition to a quickness and an accuracy of a detection by the time series analyse of simple traffic index is weak. When it is a stable flow a relationship between the occupancy and a flow is a linear, which explain a very high reliability. In contrast, a platoon form presented by a wide deviation about an ideal speed of drivers is difficult to express by a statical model in a relationship between the speed and occupancy, In this case the speed drops shifty at 6~8% occupancy. In case of an unstable flow, it is difficult to adopt a statistical model because the formation-clearance Process of a traffic jam is analyzed in each parts. Taken the formation-clearance process of a traffic jam by 2 parts division into consideration the flow having an accident is transferred to a stopped flow and the occupancy increases dramatically. When the flow recovers from a sloped flow to a free flow the occupancy which has increased dramatically decrease gradually and then traffic flow increases according as the result analyzed traffic flow by the multi regime as time series. When it is on the traffic jam the traffic flow transfers from an impeded free flow to a congested flow and then a jammed flow which is complicated more than on the accidents and the gap of traffic volume in each traffic conditions about a same occupancy is generated huge. This research presents a need of a multi-regime division when analyzing a traffic flow and for the future it needs a fixed quantity division and model about each traffic regimes.