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천범석 ( Beomseok Chun ),이태화 ( Taehwa Lee ),김상우 ( Sangwoo Kim ),김종건 ( Junggun Kim ),신용철 ( Yongchul Shin ) 한국농공학회 2020 한국농공학회 학술대회초록집 Vol.2020 No.-
본 연구에서는 DNN 기법을 이용하여 국내의 시계열 토양수분을 산정하였다. DNN 회귀모형의 민감도 분석을 시행하기 위하여 평창군 및 거창군 지점의 TDR 기반 실측토양수분(10cm 및 30cm)과 DNN 입력자료(기상 및 지표 특성)을 수집하였다. 민감도 분석 결과 산정된 토양수분이 기상 변수(5일 강우평균, 5일 선행강우 및 누적강우)와 DEM에 민감한 것으로 나타났다. 이러한 분석 결과는 DEM과 기상 변수가 토양수분 유출 과정에서 중요하다는 것을 나타낸다. 민감도분석 결과를 바탕으로 DNN 회귀모형을 사용하여 연구 지점에서 10cm 및 30cm 깊이에서의 모의토양수분을 산정하였다. 평창군 지점에서는 10cm 깊이에서의 모의토양수분(R: 0.890, RMSE: 0.041)은 실측값과 비교하여 비슷한 것으로 나타났으며, 30cm 깊이에서의 모의토양수분(R: 0.843, RMSE: 0.048)은 10cm 깊이에서의 모의토양수분과 비교하여 상대적으로 불확실성이 높게 나타났다. 거창군 지점의 경우 10cm 및 30cm 깊이에서의 DNN 기반 모의토양수분(R: 0.997/0.995, RMSE: 0.014/0.006)이 모두 실측값과 유사한 것으로 나타났다. 비록 산정된 모의토양수분에서 불확실성이 발생하였으나, DNN 회귀모형으로 산정한 모의토양수분이 TDR 기반 실측토양수분을 잘 반영하는 것으로 나타났다. 본 연구는 농업, 산림 및 수문 등의 다양한 분야에서 활용될 것으로 사료된다.
황일선,Beomseok Lee,Rahul Krishnan,Hiroaki Nakajima,Hidetaka Furuya,Sang Phil Shin 대한수의학회 2020 Journal of Veterinary Science Vol.21 No.6
Background: Dicyemids are parasites found in the renal sac of cephalopods. The first species of dicyemid was found from kidneys of the Korean common octopus Callistoctopus minor. Objectives: This study aimed to identify the dicyemid and investigate the effect on renal sac of host. Methods: In this study, we compared the morphological characteristics of isolate to dicyemids (Dicyema sphyrocephalum, Dicyema clavatum, and Dicyema dolichocephalum) reported from C. minor in Japan. We compared the 18S ribosomal RNA (rDNA) and cytochrome c oxidase subunit I (COI) sequences of isolate to the sequences of D. shyrocephalum and D. clavatum. The infected octopuses renal tissues were histologically compared with the tissues of uninfected individuals. Results: The morphological characteristic of this isolated species corresponds to D. sphyrocephalum. The sequences similarities of 18S rDNA and COI gene of isolate are 99.7% and 98.1% with D. sphyrocephalum. We observed morphological changes in the epithelia folds of kidney at the dicyemids attached areas. Conclusions: The present study identified the isolate as D. sphyrocephalum and this is the first report of dicyemid species from Republic of Korea. Further studies on the effects of dicyemids on growth and health status of cephalopods will be needed.
Radiation Dose Assessment of Thorium-containing Gas Mantle for Use and Disposal Scenarios
Jimin Shin,Beomseok Ko,Hee Seo,Meeryeong Kim,Minkyung Kim,Sangmin Lee 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
The IAEA recommended considerations for exemption regulations of consumer products containing greater amounts of radioactive isotopes than the amounts specified for generic exemption. One of the major considerations is the expected exposure dose should be less than 10 μSv/y and 1 mSv/y for general cases and low probability cases, respectively, in all predictable scenarios. Under this recommendation, many countries evaluated the radiation dose for exposure scenarios of various products in consideration of the national circumstances and, then, established their own specific exemption regulation. In Republic of Korea, the “Regulation on substances excluded from radioactive isotopes” was legislated to specify consumer products excluded from regulation. However, as the usage status and product specifications has changed over time, it is necessary to periodically verify the validity of the regulation criteria in the view of exemption justification. In this study, we developed the use and disposal scenarios in consideration of the domestic use of thorium-containing gas mantle and evaluated radiation dose of each scenario accordingly. The gas mantles are used as a wick for gas lanterns and the maximum activity of natural thorium contained among the currently available gas mantles is 12.5 kBq. Radioactive isotopes in the decay chain of natural thorium can be divided into three groups according to their physical characteristics, and exposure routes suitable for each group were considered in dose calculation. Currently, most gas mantles are installed in camping lanterns. Therefore, we developed use scenarios related to camping. The average number of camping trips and time spent at the campground were set by the data from Korea Tourism Organization. Tent sizes and vehicle specifications were determined by referring to surveys and products in Korea. The used gas mantle is disposed of in a garbage bag for general waste and transported to landfill or incinerator. We determined the amount of gas mantle discarded in landfill and incinerator by the data from Korea Environment Corporation. The exposure time and amount handled by an individual were determined by considering the number of waste collection vehicles, landfills, and incinerators. Although we assumed the maximum activity of the gas mantle for conservative evaluation, the calculated radiation doses for the use and disposal scenarios were below the general requirement (i.e., 10 μSv/y) in all scenarios.