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Influence of Nitrogen moieties on CO2 capture of Carbon Aerogel
Da-Hee Jeon,Byung-Gak Min,Jong Gab Oh,Changwoon Nah,Soo-Jin Park 한국탄소학회 2015 Carbon Letters Vol.16 No.1
Carbon aerogel is a porous carbon material possessing high porosity and high specific surface area. Nitrogen doping reduced the specific surface area and micropores, but it furnished basic sites to improve the CO2 selectivity. In this work, N-doped carbon aerogels were prepared with different ratios of resorcinol/melamine by using the sol-gel method. The morphological properties were characterized by scanning electron microscopy (SEM). Nitrogen content was studied by X-ray photoelectron spectroscopy (XPS) and the specific surface area and micropore volume were analyzed by N2 adsorption-desorption isotherms at 77 K. The CO2 adsorption capacity was investigated by CO2 adsorption-desorption isotherms at 298 K and 1 bar. Melamine containing N-doped CAs showed a high nitrogen content (5.54 wt.%). The prepared N-doped CAs exhibited a high CO2 capture capacity of 118.77 mg/g (at resorcinol/melamine = 1:0.3). Therefore, we confirmed that the CO2 adsorption capacity was strongly affected by the nitrogen moieties.
Ag 또는 CuO를 코팅한 평판형 ZnO 분말의 합성 및 항균성 평가
홍다희(Da-Hee Hong),곽지유(Ji-Yoo Gwack),전덕성(Deock-Seong Jeon),조동현(Dong-Hyeon Jo),이건섭(Gun-Sub Lee),이정환(Jung-Hwan Lee),이희철(Hee-Chul Lee) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.3
In the present work, planar-type ZnO powder of [0001] plane with a high aspect ratio range of 20:1 to 50:1 was synthesized. Ag or CuO could be coated on the planar-type ZnO powder by wet methods such as centrifugation or ball milling. During the coating, the average size of the powder was slightly increased while maintaining the shape and XRD pattern of ZnO. When Ag or CuO was coated, the absolute value of the zeta potential, as well as the concentration of oxygen vacancy, was increased. Ag or CuO coated planar-type ZnO power exhibited excellent antibacterial performance, which seems to be related to their high electrostatic attraction force. They could be made into a masterbatch by mixing with ABS resin, and their applicability to antibacterial substances was confirmed by manufacturing the caps of a keyboard.
MS 마커를 활용한 지역별 오계 유전자원의 다양성 및 유연관계 분석
노희종(Hee-Jong Roh),김관우(Kwan-Woo Kim),이진욱(Jin-Wook Lee),전다연(Da-Yeon Jeon),김승창(Seung-Chang Kim),전익수(Ik-Soo Jeon),고응규(Yeoung-Gyu Ko),이준헌(Jun-Heon Lee),김성희(Sung-Hee Kim),백준종(Jun-Jong Baek),오동엽(Dong-Yep Oh) 한국가금학회 2018 韓國家禽學會誌 Vol.45 No.3
본 연구는 연산오계(천연기념물 제265호)와 이를 기원으로 하는 5개 지역별 오계 집단의 유전적 특성 및 차별성을 분석하기 위해 25개의 초위성체(MS) 마커를 이용하여 총 9개 집단 243수를 대상으로 유전자형을 분석하였다. 마커별 다형성 분석 결과, 총 153개의 대립유전자가 확인되었으며, Hexp와 PIC의 경우 MCW0145에서 각각 0.640, 0.570으로 가장 높았고, Hobs는 MCW0252에서 0.607로 가장 높은 값을 나타내었다. 반면, LEI0166에서 Hexp, Hobs, PIC가 각각 0.248, 0.204, 0.202로 가장 낮았다. 집단간 유전거리 분석 결과로는 9개 집단중 YSO 집단과 SUO 집단이 가장 가까운(0.073) 반면, LG 집단과 CBO 집단 사이에서 가장 먼(0.937) 것으로 확인되었다. 집단의 실제 구조를 확인하기 위한 집단별 균일도를 분석한 결과, 공시된 9개의 집단은 3개의 집단으로 구분했을 때 최적의 K값(7.96)을 얻을 수 있었으며, 5개의 오계 집단(YSO, ARO, CBO, CNO, SUO) 및 LG 집단과 CN․RIR 집단은 각각 1, 2, 3번 군집에 분포하고 있는 것으로 나타났다. 한편, GBO 집단의 경우 1번과 3번 클러스터에 걸쳐서 분포하고 있는 것으로 보아 사육과정에서 타집단과의 교잡이 일어났을 것으로 추정된다. 이러한 결과를 통해 추후 오계 유전자원에 대한 국가 수준의 유전적 특성평가 및 관리의 기초 자료로 유용하게 활용될 것으로 기대된다. The aim of this study was to evaluate the genetic diversity and relationships of Ogye populations in Korea. A total of 243 genomic DNA samples from 6 Ogye population (Yeonsan Ogye; YSO, Animal Genetic Resources Research Center Ogye; ARO, Chungbuk Ogye; CBO, Chungnam Ogye; CNO, Gyeongbuk Ogye; GBO, Seoul National University Ogye; SUO) and 3 introduced chicken breeds (Rhode Island Red; RIR, White Leghorn; LG, Cornish; CN) were used. Sizes of 25 microsatellite markers were decided using GeneMapper Software(v 5.0) after analyzing ABI 3130XL. A total of 153 alleles were observed and the range was 2 to 10 per each locus. The mean of expected and observed heterozygosity and PIC (Polymorphism Information Content) value was 0.53, 0.50, 0.46 respectively. The lowest genetic distance (0.073) was observed between YSO and SUO, and the highest distance (0.937) between the RIR and CBO. The results of clustering analysis suggested 3 clusters (ΔK=7.96). Excluding GBO population, 5 Ogye populations (YSO, ARO, CBO, CNO, SUO) were grouped in same cluster with high genetic uniformity (0.990, 0.979, 0.989, 0.994, 0.985 respectively). But GBO population was grouped in cluster 1 with low genetic uniformity (0.340). The results of this study can be use to basic data for the genetic evaluation and management of Ogye populations in Korea.
Jeon, Jae Keun,Kim, Sang Soo,Kang, Da Haeng,Kim, Bo Kyoung,Koo, Ja Pung,Moon, Ok Kon,Lee, Joon Hee International Academy of Physical Therapy Research 2013 Journal of International Academy of Physical Ther Vol.4 No.1
This study has investigated the effect of isometric contractile force and muscle activity applying sperficial heat according to the time from the biceps brachii muscle. In this study, 20 university students participants without musculoskeletal and neurological disorders. By applying a hot pack 5min, 10min, 20min and 30min respectively. After that measurement are skin temperature, contractile force and muscle activity. Skin temperature of the hot 5 min applied that rapidly changing. Increasing the time it takes to apply a variance has been reduced(p<.001). Isometric contractile force was not statistically significant but highest when applying the hot pack 5 minutes and lowest when applying the hot pack 30 minutes(p<.001). Muscle activity and median frequency was highest when applying the hot pack 5 minutes. To analyze the above results, it was found that isometric contractile force and muscle activity changed according to the applying time. These result lead us to the conclusion that this study will be more evidence for changes in muscle contraction to apply hot pack on clinic.
Jeon, Min-Cheol,Kim, Ju Ock,Jung, Sung Soo,Park, Hee Sun,Lee, Jeong Eun,Moon, Jae Young,Chung, Chae Uk,Kang, Da Hyun,Park, Dong Il The Korean Academy of Tuberculosis and Respiratory 2018 Tuberculosis and Respiratory Diseases Vol.81 No.4
Background: We developed an additional laser guidance system to improve the efficacy and safety of conventional computed tomography (CT)-guided percutaneous transthoracic needle biopsy (PTNB), and we conducted this study to evaluate the efficacy and safety of our system. Methods: We retrospectively analyzed the medical records of 244 patients who underwent CT-guided PTNB using our additional laser guidance system from July 1, 2015, to January 20, 2016. Results: There were nine false-negative results among the 238 total cases. The sensitivity, specificity, positive predictive value, negative predictive value, and diagnostic accuracy of our system for diagnosing malignancy were 94.4% (152/161), 100% (77/77), 100% (152/152), 89.5% (77/86), and 96.2% (229/238), respectively. The results of univariate analysis showed that the risk factors for a false-negative result were male sex (p=0.029), a final diagnosis of malignancy (p=0.033), a lesion in the lower lobe (p=0.035), shorter distance from the skin to the target lesion (p=0.003), and shorter distance from the pleura to the target lesion (p=0.006). The overall complication rate was 30.5% (74/243). Pneumothorax, hemoptysis, and hemothorax occurred in 21.8% (53/243), 9.1% (22/243), and 1.6% (4/243) of cases, respectively. Conclusion: The additional laser guidance system might be a highly economical and efficient method to improve the diagnostic efficacy and safety of conventional CT-guided PTNB even if performed by inexperienced pulmonologists.
Hee-Cheol Jeon,Kayoung Lee,Jinseung Kim,Tae-Jin Park,Dae-Won Kang,Da-Jung Park 대한가정의학회 2014 Korean Journal of Family Medicine Vol.35 No.6
Background: The relationships of total and regional body fat percent with bone mineral density (BMD) in Korean adolescents were examined using the Fifth Korea National Health and Nutrition Examination Survey (KNHANES V-1), 2010. Methods: Body fat percent at whole body (WBFP), trunk (TBFP), and extremities (both upper and lower extremities fat mass/body weight, EBFP), ratio of trunk fat mass to extremities fat mass (TEFR), and BMD at whole body, total femur, and lumbar spine were measured by dual energy X-ray absorptiometry in a population-based sample of 433 boys and 362 girls, aged 12 to 18 years. The analyses were conducted using linear regression analysis with complex sampling design. Results: After adjusting for confounders such as age, height, weight, serum 25-(OH) vitamin D concentration, energy intake, calcium intake, physical activity, and menarche status for girls, WBFP, TBFP, and EBFP were inversely associated with whole and regional BMD in both sexes (P < 0.05). TEFR was positively associated with whole and regional BMD in boys after adjusting for confounders, while it was negatively associated in girls (P < 0.05). However, the associations were non-significant when bone mass-free lean mass was adjusted instead of bodyweight except for a positive association between TEFR and BMD in boys. Conclusion: In Korean adolescents, total and regional body fat percent is not independently associated with BMD after adjusting for bone mass-free lean mass but higher fat in trunk as compared to extremities may be protective for BMD in boys.