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Estimation of Evapotranspiration Model for Seasonal Irrigation Control of Garlic
Ui Jeong Woo,Won Jun Jo,Ha Seon Sim,Hye Jin Lee,Yu Hyun Moon,Soo Bin Jung,Su Ran Ahn,Jung Su Jo,Sung Kyeom Kim 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
Irrigation amount and schedule is considered depend on the cultivation environments, cultural practices, crop species and it is necessary to estimate the water requirement accurately for efficient irrigation management. The purpose of this experiment is to estimate the amount of evapotranspiration of garlic (ETc) using the Penman-Monteith (P-M) equation in open field cultivation and to supply an appropriate amount of water per unit area for each season. The experiment was conducted from October 7, 2020 to June 16, 2021 at the open field of Kyungpook National University’s trial farm. Environmental data in terms of air temperature, wind speed, humidity, and solar radiation required for evapotranspiration amount (ETo) calculation were collected every 10 minutes in a data logger. The ETc was estimated by P-M equation. The average daily air temperature and relative humidity were maintained at 10.4°C and 52.7%, respectively during experiment periods. The daily average of ETo was approximately 5.9 mm and that increased at the late spring and the early summer cultivation season. When calculating seasonal ETo by four seasons based on 24 seasonal divisions, the daily averages of ETo were 6.07 mm, 4.92 mm, 6.42 mm, and 6.75 mm, respectively, autumn, winter, spring, and summer in sequence. ETo in winter was estimated to be lower than in other seasons, which is considered to be that crop transpiration was reduced due to dormancy. The ETc was calculated by multiplying ETo and the crop coefficient (Kc ini = 0.7, Kc mid = 1.0, and Kc end = 0.7). The seasonal average irrigation amount (ETc × cultivation area) per 10a was estimated 4.2 ton, 4.5 ton, 6.2 ton, and 4.7 ton, respectively. In addition, ETo increased from 200 days after transplanting, a period when the leaf senescence rate, bulb weight, and bulb diameter increased rapidly. Results founded that the seasonal irrigation amount of garlic estimated using the P-M equation can be applied for precise irrigation control.
고분자캐패시터에 대한 충방전 조건에서의 온도에 따른 정전용량감소 특성 연구
정의효(Ui-Hyo Jeong),임홍우(Hong-Woo Lim),형재필(Jae-Phil Hyung),고민지(Min-Ji Ko),정창욱(Chang-Uk Jung),조정하(Jeong-Ha Cho),장중순(Joong-Soon Jang) 한국신뢰성학회 2017 신뢰성응용연구 Vol.17 No.1
Purpose: Polymer capacitors are known to have very high reliability as compared with liquid electrolytic capacitors, but their capacity has been reported to decrease in charge and discharge at low temperature. The purpose of this study to clarify these characteristics. Methods: In order to clarify these characteristics, charging-discharging tests were carried out for 200 hours with three different capacities and at 5 different temperature from 5℃ to 100℃. Results: As a result of the test, it was confirmed that the capacity of the polymer capacitor was decreased with higher capacity and lower temperature. Conclusion: Such a failure phenomenon was caused by the shrinkage and expansion characteristics of the polymer used therein, it is presumed that this failure phenomenon is due to the complex pore structure made by etching.
Ui Nam Ryoo,Chel Hun Choi,Ji Yeong Yoon,Soo Kyung Noh,Heeseok Kang,Woo Young Kim,Boh Hyun Kim,Tae-Joong Kim,Jeong-Won Lee,Je-Ho Lee,Byoung-Gie Kim,Duk-Soo Bae 대한암학회 2007 Cancer Research and Treatment Vol.39 No.4
Purpose: The purpose of this study was to evaluate the factors that are associated with the accuracy of magnetic resonance (MR) imaging for predicting myometrial invasion and lymph node metastasis in women with endometrial carcinoma.Materials and Methods: We retrospectively reviewed the medical records and preoperative MR imaging reports of 128 women who had pathologically proven endometrial carcinoma. We compared the MR imaging and the histopathology findings.Results: The sensitivity, specificity and accuracy for identifing any myometrial invasion (superficial or deep) were 0.81, 0.61 and 0.74, respectively; these values for deep myometrial invasion were 0.60, 0.94 and 0.86, respectively. The sensitivity, specificity and accuracy of MR imaging for detecting lymph node metastasis were 50.0%, 96.6% and 93.0%, respectively. The patients who were older, had more deliveries and a larger tumor size more frequently had incorrect prediction of deep myometrial invasion (p=0.034, p=0.044, p=0.061, respectively). A higher tumor grade, a histology other than the endometrioid type, myometrial invasion on MR findings and a larger tumor size were associated with a more frequent false-negative prediction of lymph node metastasis (p=0.018, p=0.017, p=0.002, p=0.047, respectively). A larger tumor size was also associated with more frequent false-positive results (p=0.009).Conclusions:There are several factors that make accurate assessment of myometrial invasion or lymph node metastasis difficult with using MRI; therefore, the patients with these factors should have their MR findings cautiously interpreted. (Cancer Res Treat. 2007;39:165-170)
Pidgeon process를 통한 마그네슘 제련 공정에서의 열 환원 거동 해석
백의현 ( Ui Hyun Baek ),이병덕 ( Byeong Deok Lee ),이기우 ( Ki Woo Lee ),한길수 ( Gil Soo Han ),한정환 ( Jeong Whan Han ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.2
This study examined methods to increase the production of Mg crown and minimize the amounts of solid impurities using the thermodynamic commercial package Factsage. A thermodynamic calculation was carried out to predict the degree of reduction of Mg vapor depending on the operating parameters through a single-stage calculation method involving the use of the CaO/MgO molar ratio, ferrosilicon/ dolime mass ratio and the pressure and temperature during the Pidgeon process. The results indicate that the CaO/MgO molar ratio was 1.4~1.5 to increase the degree of the reduction of Mg vapor in a non- equilibrium state. The thermodynamic calculations were designed to examine the effect the ferrosilicon had on specific ferrosilicon/dolime ratios. A good effect was observed between 25 and 30%. Moreover, it was determined that the optimum operating conditions which offer a high purity level of magnesium and reduce the degree of vapor was the case 5 (1200 ℃, 0.1 ~ 0.01 torr). In addition, the distribution of solid impurities in the Mg crown was calculated by a multi-stage calculation method while decreasing the temperature. Solid impurities existed as compounds in the Mg crown depending on the condensation temperature range in retort. The compound was composed of Mg2Si under 700 ℃ and CaAl2 under 500 ℃, also FeAl3, MnB under 400 ℃. A comparison of the thermodynamic calculations and experimental results regarding the types of impurities were in good agreement.(Received July 2, 2015)