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연속측정방법을 이용한 도심권 대기질 내 저농도 황화합물의 관측에 대한 연구
최여진,김기현,오상인,손장호 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.2
In this study, the concentrations of major reduced sulfur compounds (H₂S, CH₃SH, DMS, and DMDS) were determined from ambient air in a monitoring station located in the mid-eastern area of Seoul. Measurements of sulfur species were conducted by the combination of on-line air sampling, thermal desorption, and capillary GC/PFPD analysis. A total number of 143 hourly samples were collected in the two time periods set between June and July 2003. The mean concentrations of four sulfur species measured in the whole study period were found on the order: DMS (535±183H) > H₂S (47±10) > DMDS (35±22) > CH₃SH (6.19±29.4 pptv). The results of this study show that the concentrations of DMS at the study area are generally higher than those reported previously in the oceanic environments, while those of other sulfur species are not easy to compare with due to the lack of data. The H₂S concentrations were generally higher during the daytime than the nighttime, whereas those of others generally exhibited a reversed diurnal pattern. The overall results of our study suggest that the distribution of major reduced S compounds should be controlled by diverse processes in the urban area.
임부의 연령에 따른 보완대체요법에 관한 인식 태도 경험 비교 연구
김연진,김지연,노경민,신혜리,유예지,이지민,장희조,정아인,최소정,강숙정,이향연,민혜영 이화여자대학교 간호과학대학 2016 이화간호학회지 Vol.- No.50
Purpose: This study aims to test if the age of pregnant women affects the perception, experience, and attitude towards complementary alternative therapy (CAT), by investigating the perception, experience, and attitude of pregnant women under the age of 35, and above 35 (Advanced Maternal Age). The study will 1) find the general characteristics of pregnant women under and over the age of 35 2) compare the perception, behavior, and experience of pregnant women under and over the age of 35, and 3) find the comparison of the perception, behavior, and experience according to the general characteristics of pregnant women under and over the age of 35. Method: The subjects of this study are composed of 44 women under the age of 35 and 44 women above the age of 35, totaling 88 pregnant women visiting midwiferies, obstetrics and gynecology, and baby fairs in Seoul and Gyeong-Gi area. Data for this study was collected from November 28, 2015 to January 6, 2016 for 40 days. The collected data analyzed mean, standard deviation, t test, ANOVA, and chi-square by using SPSS 23.0. Result Results show that there is a significant difference in the perception, attitude, and experience of the two-sample groups in the use of CAT. The question of “what is most necessary when applying CAT in a hospital clinical environment” for the perception criteria came out with the results of t=9.980, p<.05. For the attitude, results showed that the answers of pregnant women under the age of 35 displayed a more positive attitude towards CAT. (t=2.421, p<.05) Lastly, in the experience section, pregnant women under the age of 35 showed more CAT use than the other sample group. Conclusion Results have shown that there is a difference in the perception, behavior, and experience between the two sample groups. Therefore further research on the efficacy and the adverse effects of CAT needs to be done.
최여진,오상인,김기현 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.5
In the present work, the distribution characteristics of ambient volatile organic compounds (VOCs) were investigated at high temporal resolution from a monitoring station located in a mid-eastern area of Seoul. A total number of 587 samples were collected during December 2002 to January 2003. The measurements of VOC were conducted by a combination of on-line air sampling and thermal desorption unit (TDU) coupled with capillary GC/FID analysis. A total of five aromatic compounds (BTEX: benzene, toluene, ethyIbenzene, m, p-xylene, and o-xylene) were, measured routinely at hourly intervals during the whole study period. The mean concentrations of BTEX measured in our study period were found in the order: toluene (8.99±5.38ppb)>benzene(0.92±0.52ppb)>m, p-xylene (0.51±0.34ppb)>o-xylene(0.48±0.35ppb)>ethyl benzene (0.43±0.32ppb). The BTEX concentrations were generally higher during the daytime than the nighttime, exhibiting certain patterns on a weekly basis. Results of our analysis indicate that the unusually high concentrations of toluene, while showing good correlations with other VOCs, can be a good indicator of air pollution in the study area.
다중 이용시설의 실내 공기 중 휘발성 유기화합물질(VOC)의 농도에 관한 연구
이기한,최여진,김기현 경희대학교 2003 環境硏究 論文集 Vol.12 No.-
As a means to investigate the status of indoo ollution Korea, we collected and analyzedmajor aromatic volatile compound (VOC) from diverse indoor facilities located all across Seoul city. The concentrations of major aromatic VOc inc uding benzene, toluene, ethylbenzene, xylene (commonly called, BTEX), and styrene were measured during the period covering Sept. through Nov. 2003. the results of our study generally indicated that the VOC levels in most indoor facilities are high enough to be distinguished from outdoor environments. Moreover, such pollution was generally dominated by significantly enhanced concentrations of toluene. Powever, it was found that relative dominance of VOC tend to vary greatly among different indoor conditions.
김기현,오상인,최여진,김민영,최규훈 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.4
In order to develop a confident sampling technique, we designed and constructed a 6-port manifold MFC sampling system for collecting gaseous pollutants in air. Using this instrumentation, we tested the performance criteria of MFC system in terms of: (1) flow rate; (2) MFC-to-MFC variability: (3) tube-to-tube variability: and (4) time. It was interesting to find that the later two factors did not show any significant variations, while the former two show substantially large variations. However, as most of those variabilities are consistent enough to form systematic patterns, we were able to explain the occurrence patterns of all those MFC biases in terms of those tour major variables. The overall results of our experiment suggest that one needs to use correction factor for each MFC unit under a given flow rate to maintain optimal accuracy and precision for sampling of those pollutants.
Ye Jin Jeong,Yu Gyeong Jeon,Hee Ju Choi,Eun Jin Baek,Guk Hyun Kim,Yun Jung Yang,Min Jae Kim,Joon Gyu Min,김광일 한국수산과학회 2023 Fisheries and Aquatic Sciences Vol.26 No.7
Cyprinids are popular species for aquaculture worldwide, with Asia being a significant contributor to their production. In Korea, common carp (Cyprinus carpio), koi carp (Cyprinus rubrofuscus), and goldfish (Carassius auratus) are cultivated domestically and imported for ornamental or human consumption purposes. Among the viruses that infect cyprinids, cyprinid herpesvirus-2 (CyHV-2), koi herpesvirus (KHV, also known as cyprinid herpesvirus-3), and carp edema virus (CEV) are of particular concern as they cause substantial economic losses to the aquaculture industry. In this study, we investigated these viruses in both of domestic and imported cyprinids. Our results revealed that CyHV-2 was only detected in imported goldfish from Thailand. To further investigate the genetic characteristics of them, the marker A region was analyzed. Despite belonging to the same cluster with isolates from China, France, Poland, and Israel, CyHV-2 detected in this study showed distinct differences in their repetitive sequence sizes. Furthermore, two different forms of KHV/CEV coinfection were identified from domestic koi carp, both of which exhibited typical symptoms. Phylogenetic analysis showed that one KHV isolate (ScKc-2105-K) was of the Asian type and closely related to isolates from Japan, Indonesia, Belgium, Taiwan, and China. Two CEV isolates (ScKc-2105-CE and GhKc-2207-CE) belonged to the IIa type and showed high similarity with isolates from the USA, France, and Korea. Notably, koi carp injected with cultured KHV (ScKc-2105-K) showed 78.0% cumulative mortality within 14 days post-injection (dpi). Our findings support the importance of regular surveillance of viral diseases in cyprinids.
Prevalence of Clostridium tetani isolated from cattle farms in Korea
Jin Sung Seo(Jin Sung Seo),Young Min Son(Young Min Son),Kwang-Ho Choi(Kwang-Ho Choi),Mi-Hye Hwang(Mi-Hye Hwang),Kichan Lee(Kichan Lee),Bang-Hun Hyun(Bang-Hun Hyun),Young-Ju Lee(Young-Ju Lee),Byeong Ye 한국예방수의학회 2018 한국예방수의학회 학술대회자료집 Vol.2018 No.-
Visual Disturbance Caused by a Nail Gun-Induced Penetrating Brain Injury
( Jin Bong Ye ),( Young Hoon Sul ),( Se Heon Kim ),( Jin Young Lee ),( Jin Suk Lee ),( Hong Rye Kim ),( Soo Young Yoon ),( Jung Hee Choi ) 대한외상학회 2021 大韓外傷學會誌 Vol.34 No.3
Penetrating brain injury caused by a nail gun is an uncommon clinical scenario reported in the literature. A 36-year-old male presented with a nail that had penetrated through the occipital bone. He was alert and neurologically intact except for visual disturbance. Computed tomography (CT) of the brain showed the nail lodged at the occipital lobe and the parietal lobe, with minimal intracerebral hemorrhage. The nail was placed in the occipital lobe close to the superior sagittal sinus. We removed the nail with craniotomy since the entrance of the nail was close to the superior sagittal sinus. There were no newly developed neurological deficits postoperatively. Immediate postoperative CT showed no newly developed lesions. The patient recovered well without any significant complications. Two weeks postoperatively, magnetic resonance imaging showed no remarkable lesions. The visual disturbance was followed up at the outpatient department. To summarize, we report a rare case of penetrating head injury by a nail gun and discuss relevant aspects of the clinical management.
Chest Radiography of Tuberculosis: Determination of Activity Using Deep Learning Algorithm
( Ye Ra Choi ),( Soon Ho Yoon ),( Jihang Kim ),( Jin Young Yoo ),( Hwiyoung Kim ),( Kwang Nam Jin ) 대한결핵 및 호흡기학회 2023 Tuberculosis and Respiratory Diseases Vol.86 No.3
Background: Inactive or old, healed tuberculosis (TB) on chest radiograph (CR) is often found in high TB incidence countries, and to avoid unnecessary evaluation and medication, differentiation from active TB is important. This study develops a deep learning (DL) model to estimate activity in a single chest radiographic analysis. Methods: A total of 3,824 active TB CRs from 511 individuals and 2,277 inactive TB CRs from 558 individuals were retrospectively collected. A pretrained convolutional neural network was fine-tuned to classify active and inactive TB. The model was pretrained with 8,964 pneumonia and 8,525 normal cases from the National Institute of Health (NIH) dataset. During the pretraining phase, the DL model learns the following tasks: pneumonia vs. normal, pneumonia vs. active TB, and active TB vs. normal. The performance of the DL model was validated using three external datasets. Receiver operating characteristic analyses were performed to evaluate the diagnostic performance to determine active TB by DL model and radiologists. Sensitivities and specificities for determining active TB were evaluated for both the DL model and radiologists. Results: The performance of the DL model showed area under the curve (AUC) values of 0.980 in internal validation, and 0.815 and 0.887 in external validation. The AUC values for the DL model, thoracic radiologist, and general radiologist, evaluated using one of the external validation datasets, were 0.815, 0.871, and 0.811, respectively. Conclusion: This DL-based algorithm showed potential as an effective diagnostic tool to identify TB activity, and could be useful for the follow-up of patients with inactive TB in high TB burden countries.