• 한국환경과학회지
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• 제32권5호
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• pp.365-374
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• 2023

Eight years (2014-2021) of climate data were collected from an automatic weather observation system installed at the foot of Mt. Geumo in Chilgok, Gyeongbuk. Using these data, we investigated local bio-climatological indices (warmth index, WI; coldness index, CI; and effective accumulated temperature, EAT) of the mountain region adjacent to the Keimyung Dongyeong forest. The study area's WI and CI were 109.3℃ and -11.3℃ per month, respectively, averaged across 8 years. These values are indicative of an evergreen broad-leaved forest in the warm temperate climate zone, suitable for cultivating sweet persimmons and figs. Additionally, EAT in Dongyeong was 2,113.7℃, averaged across 8 years, suitable for growing crops such as corn, soybean, and potato.

• 한국잡초학회지
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• 제30권1호
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• pp.50-57
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• 2010

본 연구는 환삼덩굴의 생태적 자연출아를 서울과수원의 자연포장 조건에서 평가하여 환삼덩굴의 지역별 출아시기를 예측하고자 실시하였다. 환삼덩굴의 일별 및 유효적산온도별 누적 출아율을 Gompertz 모델을 이용하여 회귀분석하였다. Gompertz 모델은 환삼덩굴의 출아를 지역에 상관없이 양호하게 설명하였으며 환삼덩굴의 최초 출아 유효적산온도는 $56.7^{\circ}C$이며, 최대출아율 50%에 도달하는데 필요한 유효적산온도는 $76.3^{\circ}C$로 계산되었다. 2000년부터 2009년까지 지난 10년간의 지역별 일평균기온을 바탕으로 최초 출아에 필요한 유효적산온도 $56.7^{\circ}C$에 도달하는 시기를 예측한 결과 대구가 3월 21일로 가장 빨랐고 광주(3월 26일), 전주(3월 29일), 대전(3월 30일), 서울(4월 1일), 수원(4월 4일), 춘천(4월 6일), 철원(4월 12일) 순이었다. 같은 방식으로 최대출아율의 50%에 도달하는 출아시기를 예측한 결과 대구가 3월 25일로 가장 빠르며 광주(3월 30일), 전주(4월 2일), 대전(4월 3일), 서울(4월 5일), 수원(4월 8일), 춘천(4월 9일), 철원(4월 15일) 순이었다.

• Journal of Welding and Joining
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• 제2권1호
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• pp.41-48
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• 1984

Recrystallization technique was applied to analyze plastic strain at the notch tip of coarse grain HAZ in mild steel (SB 41) and high strength steel (SA 588). The notch tip of specimen was deformed by three point bending. Accumulated displacement (Crack Opening Displacement ${delta}t$) by the monotonic and cyclic loading under room temperature and hot strain embrittlement temperature ($250^{\circ}C$) was 0~1.0mm. Recrystallization heat treatment conditions were $650^{circ}C{ imes}3hr$ for SB 41 and $700^{circ}C{ imes}3hr$ for SA 588. The experimental results obtained were as follows ; 1) Distribution of the effective plastic strain at plastic zone was appeared by the function of crack opening displacement, and plastic zone or the effective plastic strain increased with crack opening displacement. 2) Plastic strain at notch tip of HAZ due to accumulated hot strain calculated as follows. .epsilon. over bar $_{p}$ = .epsilon. over bar $_{cr}$ (x/ $R_{x}$ ) $^{m}$ (m=0.25) 3) Work hardending ratio of notch tip for hot strain was linearly increased with .epsilon. over bar $_{max}$ and dependent upon the material types.s.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1995년도 추계 학술대회지
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• pp.36-37
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• 1995

• 전기학회논문지P
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• 제54권2호
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• pp.94-100
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• 2005

Abnormal symptoms on operating conditions of power transformer are monitored by a preventive diagnostic system which prevents the sudden power failure in case of quick progress of abnormal situation. The preventive diagnostic system helps plan the proper maintenance method according to the transformer conditions via accumulated data. KEPCO has adopted the preventive diagnostic system at nine of 345kV substations since 1997. Application techniques of the diagnostic sensors were settled, but diagnostic algorithm and practical use of accumulated data are not yet established. To build up the diagnostic algorithm and effective use of the preventive diagnostic system, the reliability of the data which were accumulated in a server computer is very important. This paper describes the data analysis in the server in order to advance the reliability of the accumulated data of the preventive diagnostic system. The principles and data flows of the diagnostic sensors were analyzed, and the data discrepancy between sensors and server were calibrated.

• 한국자원식물학회지
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• 제37권2호
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• pp.161-170
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• 2024

본 연구는 잇꽃(Carthamus tinctorius) 4자원(재래종, IT323225, IT333473, IT333482)의 유효적산온도를 기반으로 개화 소요일수 추정과 파종시기에 따른 생육 및 수량 특성을 비교하고자 수행되었다. 잇꽃 4자원은 3월 29일, 5월 3일, 5월 13일, 5월 24일, 6월 2일에 각기 파종하였으며, 생육기간 동안 기상정보수집과 생육단계 및 수량 특성을 조사하였다. 파종시기별 잇꽃 4자원의 평균 개화 소요일수는 재래종(61.0일)이 가장 짧았고, IT333482 (73.2일), IT323225 (74.0일), IT333473 (74.2일) 순이었다. 평균온도를 근거로 산출한 잇꽃 4자원의 기준온도와 유효적산온도는 각각 재래종 6℃, 579℃, IT323225 11℃, 766℃, IT333473 11℃, 768℃, IT333482 10℃, 750℃이었다. 산출한 유효적산온도와 최근 5년간(2019-2023년)의 일평균기온을 이용하여 재배지대(평야지, 중산간지, 산간지)와 파종시기(4월 1일부터 8월 15일까지 15일 간격, 10수준)별로 적용한 결과, 잇꽃 4자원은 모두 7월 15일 파종까지 개화 소요일수가 감소한 후 증가하는 경향을 보였고, 지대별 소요일수는 평야지 < 중산간지 < 산간지의 순으로 조사되었다. 수량 특성 중 초장, 분지 수, 주당 화기 수, 화기당 종자 수, 백립중, 주당 종자량은 4자원 모두 파종시기가 늦어질수록 감소하였다.

• 한국응용곤충학회지
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• 제62권4호
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• pp.385-388
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• 2023

매미나방(Lymantria dispar)은 나비목(Lepidoptera) 독나방과(Lymantriidae)에 속하는 해충으로 매미나방은 한국, 일본, 시베리아, 유럽, 북아메리카 등에 분포하며, 주로 배나무, 사과나무, 블루베리 등의 식물을 가해하는 광식성 해충이다. 매미나방은 수목해충으로 관리되어 왔으나 최근 산림 발생지 인접 농경지로 유입 빈도가 높아지면서 방제 대책이 수립되지 않은 농작물에 피해가 심하다. 본 연구는 매미나방(L. dispar)의 방제기술의 일환으로 매미나방 발육에 미치는 온도의 영향을 알아보기 위해 2021년 전라남도 장흥군 황금측백나무에서 채집한 알집을 이용해 18, 21, 24, 27, 30, 33℃ (14L:10D, 상대습도 60±5%) 항온조건에서 온도별, 발육단계별 발육기간을 조사하였다. 매미나방 유충의 발육속도는 온도가 높을수록 빨라졌으나, 매미나방 유충의 생존율이 33℃에서 가장 낮게 나타났다. 따라서 발육적온은 30℃였으며, 30℃에서 총 발육기간은 암컷 43.8일, 수컷 42.5일 소요되었다. 암컷과 수컷 발육영점온도는 각각 13.1℃, 12.5℃, 유효적산온도는 각각 641.1 DD, 657.8 DD였다.

• Journal of Animal Science and Technology
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• 제61권6호
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• pp.324-332
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• 2019

This study aimed to identify the causality between climatic and soil variables affecting the yield of Italian ryegrass (Lolium multiflorum Lam., IRG) in the paddy field by constructing the pathways via structure equation model. The IRG data (n = 133) was collected from the National Agricultural Cooperative Federation (1992-2013). The climatic variables were accumulated temperature, growing days and precipitation amount from the weather information system of Korea Meteorological Administration, and soil variables were effective soil depth, slope, gravel content and drainage class as soil physical properties from the soil information system of Rural Development Administration. In general, IRG cultivation by the rice-rotation system in paddy field is important and unique in East Asia because it contributes to the increase of income by cultivating IRG during agricultural off-season. As a result, the seasonal effects of accumulated temperature and growing days of autumn and next spring were evident, furthermore, autumnal temperature and spring precipitation indirectly influenced yield through spring temperature. The effect of autumnal temperature, spring temperature, spring precipitation and soil physics factors were 0.62, 0.36, 0.23, and 0.16 in order (p < 0.05). Even though the relationship between soil physical and precipitation was not significant, it does not mean there was no association. Because the soil physical variables were categorical, their effects were weakly reflected even with scale adjustment by jitter transformation. We expected that this study could contribute to increasing IRG yield by presenting the causality of climatic and soil factors and could be extended to various factors.

• 한국안전학회지
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• 제12권3호
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• pp.90-96
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• 1997

This paper was concerned with temperature aspect in the smoldering time of the accumulated each saw-dust sample of larch, oregon, aromatic trees which was formed with heaped cone-shape. The smoldering time and temperature of each sample was measured under the wind velocity of 0.10~0.15 m/s and circumstance relative humidity of 60%. As a result, the very lowest heat beginning temperature was detected in aromatic. The effective smoldering phenomena in the sample were detected when the larch saw-dust of [-20+40mesh] and the aromatic saw-dust of [-40+50mesh, -50+60mesh]. Finally the larger a particle size of saw-dust was the better a smoldering time was short. Also, it showed more increasing temperature above $70^{\circ}C$in the smoldering reaction.

• 한국자동차공학회논문집
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• 제14권1호
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• pp.183-190
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• 2006

For continuously regenerative PM collecting system which adopted thermally stable SiC DPF and electrical heater which was placed upstream of the filter and driven by well constructed control logic, PM oxidation characteristics were investigated varying air flow rate, amounts of PM accumulated on the DPF and filter inlet temperature in order to get optimized PM regeneration performance. This study showed that the operating condition of air flow rate 70 lpm, high PM loading around 30g and filter inlet temperature $700^{\circ}C$ with heat insulation was effective in achieving high regeneration efficiency. Also, in this condition, we could decrease the electric energy consumption by reducing the regeneration time.