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Yeh Rin Suh,Jeong Jae Kim,Min Bum Kim,Jeong Sub Lee,Su Yeon Ko,Doo Ri Kim,In Chul Nam 대한영상의학회 2023 대한영상의학회지 Vol.84 No.5
Ortner’s or cardiovocal syndrome is hoarseness attributable to left recurrent laryngeal nerve (RLN) palsy associated with mechanical compression of the nerve by pathologically enlarged cardiovascular structures. Ortner’s syndrome is a rare condition, and to our knowledge, only a few cases have been reported in Korea. Furthermore, this condition is extremely uncommon in pediatric patients with thyrotoxicosis-related RLN paralysis. We report a case of reversible Ortner’s syndrome in an adolescent who presented with secondary pulmonary hypertension related to thyrotoxicosis.
2종의 수서곤충 Chironomus riparius와 Cloeon dipterum의 유충 성장단계별 molinate 급성독성 비교
김병석(Byung-Seok Kim),박연기(Yoen-Ki Park),홍순성(Soon-Sung Hong),양유정(Yu-Jung Yang),박경훈(Kyung-Hun Park),정미혜(Mi-Hye Joeng),김세리(Se-Ri Kim),박경훈(Kyeong Hun Park),예완해(Wan-Hae Yeh),김두호(Doo-Ho Kim),홍무기(Moo-Ki Hong) 한국농약과학회 2009 농약과학회지 Vol.13 No.4
Molinate (S-ethyl hexahydro-1H-azepine-1-carbothioate), a selective, preemergence thiocarbamate herbicide used for grass weed control in rice fields, is being most widely used in Korea. This study was conducted to assess the comparative toxicity of molinate on two aquatic insects, Chironomus riparius and Cloeon dipterum in four larval stages. First-instar larvae of C. riparius appeared to be the most sensitive to acute exposure of molinate with a 48-h EC<SUB>50</SUB> of 7.8 ㎎/L, followed by third instar (48-h EC<SUB>50</SUB> = 22.9 ㎎/L), second instar (48-h EC<SUB>50</SUB> = 25.0 ㎎/L) and fourth instar (48-h EC<SUB>50</SUB> > 50 ㎎/L) larvae. Also, the sensitivity of the larvae of C. dipterum was presented as the same manner of the larvae of C. riparius. The youngest group of larvae of C. riparius appeared to be the most sensitive to molinate, with 96-h EC<SUB>50</SUB> values ranged from 14.3 to 24.1 ㎎/L. The authors assume that the young instar lavae of aquatic insects, Chironomus riparius and Cloeon dipterum are more sensitive to molinate. Also, the authors propose that Mayfly, Cloeon dipterum is well suited as a bioassay organism because it is one of the most vulnerable aquatic insects inhabiting agricultural ecosystem in Korea.
한국산 물벼룩 표준생태독성시험법 확립을 위한 10종 용매대조물질에 대한 독성반응 비교
김병석(Byung-Seok Kim),박연기(Yoen-Ki Park),양유정(Yu-Jung Yang),홍순성(Soon-Sung Hong),박경훈(Kyung-Hun Park),정미혜(Mi-Hye Joeng),김세리(Se-Ri Kim),박경훈(Kyeong Hun Park),예완해(Wan-Hae Yeh),김두호(Doo-Ho Kim),윤종철(Jong-Chul Yun 한국농약과학회 2010 농약과학회지 Vol.14 No.1
Most pesticides are poorly soluble in water and must be dissolved in a solvent carrier before being added to the test medium on aquatic toxicity test. The concentration of solvent is critical to the success of a test. This study were conducted to recommend possible organic solvents which have good solubility for pesticides and low toxicity to Korean native water flea to establish new standard toxicity test methods using Korean native water flea for ecological risk assessment of pesticide. Four Korean freshwater cladocerans, Daphnia obtusa, Daphnia sp., Moina macrocopa and Simocephalus vetulus were exposed to 10 different organic solvents during 48 hours to evaluate their toxic response to solvents. Ethyl acetate was the most toxic to cladocerans tested. Although ethyl ether was the least toxic to cladocerans tested, it may not adequate as possible solvent in aquatic toxicity test due to high volatility and low water solubility. In conclusion, acetone, methanol, ethanol and acetonitrile which has low toxicity as well as good water solubility are recommended as optimal organic solvent to use in aquatic toxicity tests with Korean native cladocerans tested.
Various approaches for the more effective spin-orbit torque switching
Suhyeok An,Eunchong Baek,Yeh-Ri Kim,Dongryul Kim,Jin-A Kim,Hyeongjoo Seo,Chun-Yeol You 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Spin orbit torque (SOT) induced magnetization switching is promising technique for the logic-in-memory applications. SOT switching has many advantages compare to the spin transfer torque switching: separated read/write current paths, faster switching speed, independent switching behavior on the free layer damping constant, and less energy consumption. Despite many advantages, there are still unresolved issues in SOT switching. We studied various technique to improve the efficiency of SOT switching. First, we will discuss about the effect of the He+ ion irradiation on the SOT switching, He+ ion irradiation leads not only the magnetic anisotropy, but also the spin Hall angle variations. We will also introduce several approaches in order to achieve field-free SOT switching by introducing lateral in-plane symmetry breaking.