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연구보문 : 환경환경 ; 한약재 중 살충제 Endosulfan의 잔류분석을 위한 Macroporous Diatomaceous Earth 컬럼 적용
황정인 ( Jeong In Hwang ),전영환 ( Young Hwan Jeon ),김효영 ( Hyo Young Kim ),김지환 ( Ji Hwan Kim ),이윤정 ( Yoon Jeong Lee ),박주영 ( Ju Young Park ),김도훈 ( Do Hoon Kim ),김장억 ( Jang Eok Kim ) 한국환경농학회 2011 한국환경농학회지 Vol.30 No.1
BACKGROUND: Because dried herbal medicines have many active ingredients, it is not easy to determine the residue amount after extraction, partition and clean up of pesticides from them. Especially, liquid-liquid partition method is consuming many times and solvents. Macroporous diatomaceous earth(MDE) column was used to replace the separatory funnel for liquid-liquid extraction with dichloromethane to analyze the endosulfan and its metabolite. METHODS AND RESULTS: The residue analysis method using MDE column instead of liquid-liquid partition for determining insecticide endosulfan and its metabolite in 4 dried herbal medicines was developed by GC/MS. As a result, the recovery rates of the pesticides in 4 herbal medicines were ranged from 80.3 to 93.5% for α-endosulfan, from 81.0 to 100.3% for β-endosulfan and from 80.6 to 95.6% for endosulfan sulfate, respectively. The coefficients of variation for triplicate were ranged from 1.1 to 3.4%. CONCLUSION: The improved methods are more ecofriendly, safer, faster and less laborious than conventional method by KFDA.
전원된 외상성 뇌 손상환자에서 중증도에 따른 일상적인 반복CT의 유용성
황정인 ( Jeong In Hwang ),조진성 ( Jin Seong Cho ),이승철 ( Seung Chul Lee ),이정훈 ( Jeong Hun Lee ) 대한외상학회 2009 大韓外傷學會誌 Vol.22 No.2
Purpose: Patients with traumatic brain injury (TBI) were referred from other hospitals for further management. In addition, patients routinely underwent computed tomography examinations of the head (HCT) in the referral hospitals. The purpose of this study was to evaluate retrospectively the utility of routine HCT scans according to the severity of TBI. Methods: Patients with TBI referred to our hospital between December 2005 and July 2008 were included in this study. We investigated HCT findings, indications for repeat HCT examinations (routine versus a neurological change), and neurosurgical interventions. The head injury severity was divided into three categories according to the Glasgow Coma Scale (GCS) score, including mild, moderate, and severe TBI. The use of neurosurgical interventions between patients who underwent routine HCT scans and patients who underwent HCT scans for a neurological change were compared according to the severity of TBI. Results: A total of 81 patients met the entry criteria for this study. Among these patients, 67%(n=54) of the patients underwent HCT scans on a routine basis, whereas 33%(n=27) of the patients underwent HCT scans for a neurological change. A total of 21 patients showed signs of a worsening condition on the HCT scans. Neurosurgical intervention was required for 23(28.4%) patients. For patients who underwent routine HCT examinations, no patient with mild TBI underwent a neurosurgical intervention. However, one patient with moderate TBI and three(13%) patients with severe TBI underwent neurosurgical interventions. The kappa index, the level of agreement for HCT indications of intervention and referral reasons for intervention, was 0.65 for high hierarchy hospitals and 0.06 for low hierarchy hospitals. Conclusion: Routine serial HCT examinations in the referred hospitals would be useful for patients with severe head injury and for patients from low hierarchy hospitals where no emergency physicians or neurosurgeons are available. (J Korean Soc Traumatol 2009;22:134-41)
두개저 골절과 동반된 외상성 양측성 외전신경 마비 1례
황정인 ( Jeong In Hwang ),조진성 ( Jin Seong Cho ),이승철 ( Seung Chul Lee ),이정훈 ( Jeong Hun Lee ) 대한외상학회 2008 大韓外傷學會誌 Vol.21 No.1
Traumatic bilateral abducens nerve palsy is rare and is associated with intracranial, skull and cervical spine injuries. We report a case of bilateral abducens nerve palsy in a 40-month-old patient with a skull base fracture. The injury mechanism was associated with direct nerve injury caused by a right petrous bone fracture and indirect injury by frontal impact on the abducens nerve at the point of fixation to the petrous portion and Dorello`s canal. The emergency physician should be aware of injuries and the mechanism of abducens nerve palsy in head trauma.
황정인 ( Jeong-in Hwang ),김장억 ( Jang-eok Kim ) 한국환경농학회 2016 한국환경농학회 학술대회집 Vol.2016 No.-
재배환경 중 작물에 살포된 농약은 직접 또는 간접적으로 토양에 떨어져 잔류할 수 있고, 잔류된 농약의 일부는 작물체로 흡수되어 잔류문제를 야기할 수 있다. 하지만 토양 중 잔류농약의 기준설정과 관리방안에 대한 연구는 여전히 미미한 실정이다. 본 연구에서는 토양잔류 농약의 식물흡수예측 모델식을 개발하고 예측된 결과를 이용하여 토양 중 잔류농약에 대한 관리기준을 제시하고자 하였다. 개발된 모델식의 적용성은 유기염소계 살충제 엔도설판의 α 및 β 이성질체를 대상으로 상추에 대한 흡수이행 실험을 실시하여 얻은 실험값을 모델식을 이용한 예측값과 통계적으로 비교함으로써 평가되었다. 그 결과, 개발된 모델식에 대한 적용성은 β 이성질체에 대해 39.2%의 편차를 보이며 양호하였으나 α 이성질체에 대해서는 176.3%의 상당한 편차를 보이며 낮았다. 또 한 예측된 결과로부터 제시된 상추재배 토양 중 엔도설판의 관리기준은 1.6 mg kg-1이었으나, 토양 중 생성되는 주요 대사체인 엔도설판 sulfate를 고려하여 더 낮은 농도에서 기준이 설정되어야 했다. 한편, 토양 중 잔류하는 엔도설판의 근원적인 제거를 위해 zero-valent iron (ZVI)과 ascorbic acid (AA)를 이용한 화학적인 토양복원기술도 개발하였다. 수중 분해시험을 통해 가장 효과적인 엔도설판 분해시스템(AA/ZVI/H2O2 시스템)을 조사하고 이 시스템을 토양에 적용한 결과, 엔도설판의 분해율은 α 이성질체에 대해 64.0%, β 이성질체에 대해 66.2%로 나타났으며 분해 반감기 또 한 2.7~2.8일으로 상당히 빨랐다. 전체적으로 이 연구에서 개발된 식물흡수예측 모델식과 화학적인 토양복원기술은 토양잔류 농약의 식물흡수에 대한 사전관리 방안으로 고려될 수 있었다. Most of pesticides deposited on soils either after direct or foliar spraying could be persisted in the soil, and a portion of their residues may result in the plant uptake via root. Although the plant uptake of pesticides from soil can contribute to safety problems for final agricultural products, there are no assessment tools and standards for managing the pesticide residues in soils. In this study, we developed a mathematical model for predicting theoretically the plant uptake of pesticide residues from soil and suggested a management standard for pesticide residue in soil based on the modeled results. An accuracy of the developed model was assessed by statistically comparing the modeled values with the values measured in the uptake experiments of α- and β-isomers of endosulfan (ED) by lettuce grown on ED-treated soils. As a result, the developed model was available for β-ED with the deviation of 39.2%, but not for α-ED with high deviation of 176.3%. Based on the modeled values, the management standard for ED in lettuce-cultivating soil was proposed at concentration of 1.6 mg kg-1. However, this standard concentration should be established lower than 1.6 mg kg-1 due to the consideration of toxic metabolite ED-sulfate produced with the degradation of isomers. On the other hand, we developed a chemical remediation technology to remove fundamentally the ED isomers from soil. Through aqueous degradation experiment, we found that the use of combined reagents of zero-valent iron (ZVI), ascorbic acid (AA), and H2O2 was the most effective system for the degradation of ED isomers in water, and this system was applied to remove the isomers in soil. By the use of AA/ZVI/H2O2 system, the degradation rates of α- and β-ED in soil were 64.0 and 66.2%, respectively, and their degradation half-lives were short at 2.7~2.8 d. In conclusion, overall results in this study suggest that technologies such as theoretical model prediction and chemical soil remediation could be used as advanced management strategies to prevent previously the undesirable plant uptake of pesticide residues from soil.
구두 발표 : 구두발표(OC) - 농업화학 및 생태,식품분야 ; 토양 유기물 함량에 따른 유기염소계 살충제 Endosulfan의 흡착 특성
황정인 ( Jeong In Hwang ),전영환 ( Young Hwan Jeon ),김정민 ( Jung Min Kim ),석다롱 ( Da Rong Seok ),이은향 ( Eun Hyang Lee ),전상오 ( Sang Oh Jeon ),이성은 ( Sung Eun Lee ),김장억 ( Jang Eok Kim ) 한국환경농학회 2013 한국환경농학회 학술대회집 Vol.2013 No.-
A study on fate and behavior of endosulfan, which is an organochlorine insecticide detected mainly in Korean soil, is important due to its toxicity and persistence in soil environment. To estimate isotherms for the adsorption of endosulfan isomers (α-, β-) and their metabolite (-sulfate) in soil, their adsorption amounts were investigated in various soils containing different organic matter contents. The tested soils were collected at Ansim and Gunwi, and some of them were prepared as organic matter-removed (OMR) samples using H2O2. As time-dependent adsorbed amounts of endosulfan reached to their equilibrium after 6 h in Ansim, Gunwi and OMR Ansim soils, OMR Gunwi soil did not adsorb the pesticide within 24 h. The adsorption isotherms of endosulfan isomers and their metabolite fitted to Freundlich adsorption isotherms for three equilibrated soil samples. The correlation coefficients (R2) of the isotherms were greater than 0.964. Freundlich adsorption coefficient (Kf) ranged from 8.66 to 19.20 for α-endosulfan, from 7.08 to 20.49 for β-endosulfan and from 8.62 to 17.98 for endosulfan-sulfate, respectively. The difference of Kf values of endosulfan indicated that the adsorption amount of endosulfan was dependent on the contents of organic matter. Therefore, the behavior of endosulfan in soil environment is definitely affected by the amount of organic matters in soil.
의류제품 소비자의 생활주기에 따른 주관적 지식이 정보탐색에 미치는 영향
황정인 ( Jeong In Hwang ),박재옥 ( Jae Ok Park ) 대한가정학회 2010 Family and Environment Research Vol.48 No.9
This study attempted to determine how the subjective knowledge related to a consumer`s life cycle influences their information search in the decision making process. The data was collected using a total of 349 questionnaires for the final analysis of this study. SPSS 12.0 for windows was used for the data analysis and the detailed analyses included descriptive analysis, factor analysis, reliability tests, one way ANOVA, multiple regression analysis and t-tests. The results of this study showed that there are differences in the subdivisions of subjective knowledge of apparel according to the consumer`s life cycle and there is a difference in the types of information searches according to the consumer`s subjective knowledge, and the subdivisions of subjective knowledge of the consumers influence their information search. This study showed that although it affected the internal search, the media search, and the store search, it did not influence the personal search in the decision making process.