Piezoelectric Materials: All‐Solution‐Processed Flexible Thin Film Piezoelectric Nanogenerator (Adv. Mater. 45/2012)

Chung, Sung Yun,Kim, Sunyoung,Lee, Ju‐,Hyuck,Kim, Kyongjun,Kim, Sang‐,Woo,Kang, Chong‐,Yun,Yoon, Seok‐,Jin,Kim, Youn Sang WILEY‐VCH Verlag 2012 ADVANCED MATERIALS Vol.24 No.45

<P>An all‐solution‐processed flexible piezoelectric nanogenerator, composed of polycrystalline ZnO thin film and functional polymer layers such as P3HT/PCBM and PEDOT:PSS, generates energy through a mechanical rolling and muscle stretching system. On page 6022, Youn Sang Kim, Sang‐Woo Kim, and co‐workers show that this all‐solution‐processed nanogenerator is feasible as a piezoelectric patchable device and is promising for use in future energy harvesters such as wearable human patches and mobile electronics. </P>

Tryophagus putrescentiae induces inflammatory cytokine secretions from the human cell lines THP-1 and EoL-1 cells

Jeon Sang‐Jin,Kim Eun Joo,Oh Jihyun,Yun Chi‐Young 한국곤충학회 2020 Entomological Research Vol.50 No.7

The present study aimed to identify the roles of the storage mite Tyrophagus putrescentiae (Tp) in relation to human skin diseases, such as atopic dermatitis. We examined the effects of T. putrescentiae extracts (TpE) on the secretion of inflammatory cytokines and their mRNA expression in human immune cells. Human monocytic THP-1 and eosinophilic EoL-1 cells were challenged with TpE and the inflammatory cytokines, interleukin-6 (IL-6), interleukin-8 (IL-8), and monocyte chemotactic protein-1 (MCP-1) secreted in culture supernatant were analyzed using an enzyme-linked immunosorbent assay (ELISA). The mRNA levels in the cell cultures were also measured via reverse transcriptase-polymerase chain reaction (RT-PCR). In the THP-1 cells, the TpE significantly induced the secretion of IL-6, IL-8, and MCP-1 in a time- and dose-dependent manner. It also stimulated increases in the expression levels of the IL-6, IL-8, and MCP-1 mRNA. However, while the TpE induced IL-8 and MCP-1 mRNA levels in the EoL-1 cells, it did not induce IL-6 expression. Using Western blot analysis, we confirmed the activation of extracellular signal-regulated kinase (ERK), a member of the mitogen-activated protein kinases (MAPKs), in response to TpE challenge of the THP-1 cells. Collectively, our results show that TpE challenge elicits inflammatory response in the human monocytic THP-1 and eosinophilic EoL-1 cells, and it induces increased production of the inflammatory cytokines IL-6, IL-8, and MCP-1.

급성 관동맥증후군 환자의 신기능 이상과 주요 심장사건과의 관계

이상재,윤경호,최준호,송미진,김연경,박은미,김현정,이은미,유남진,김남호,오석규,정진원 圓光大學校 醫科學硏究所 2006 圓光醫科學 Vol.21 No.1

제주도 지하수 질산염 농도의 시·공간적 변화 특성: 장기(1993-2015) 모니터링 자료의 평가

김호림(Ho-Rim Kim),오준섭(Junseop Oh),도현권(Hyun-Kwon Do),이경진(Kyung-Jin Lee),현익현(Ik-Hyun Hyun),오상실(Sang-Sil Oh),감상규(Sang-Kyu Kam),윤성택(Seong-Taek Yun) 대한자원환경지질학회 2018 자원환경지질 Vol.51 No.1

1993년부터 2015년까지 관측된 제주도 지하수 장기모니터링 관측정(N = 4,835)에서 수집된 지하수 수질자료(N = 21,568)를 기반으로 질산성질소의 시공간적 변동 특성을 평가하였다. 제주도 지하수의 질산성질소 농도의 중앙값은 2.5 mg/L로서 다른 국가나 대륙의 조사 결과에 비해 다소 높거나 유사한 것으로 나타났다. 또한 지하수 용도, 행정구역 및 고도 별로 유의한 차이를 보였다. 특히, 산간 지역에 비해 저지대 해안가에 위치한 농업 및 주거지역에서 농도가 높음을 확인하였다. Mann-Kendall 및 Sen’s slope 분석을 활용한 질산성질소 농도의 추세 분석 결과, 하류 저지 대에 비해 중산간지역에서의 질산성질소 농도 증가 경향이 뚜렷하였다. 제주도 내 토지 피복의 시계열 변화 특성과 결부 지어 보면, 중산간지역의 오염 증가 추세는 농업지역의 확장 등 인위적 활동 증가에 기인한 결과로 판단된다. 반면,기지정된 지하수자원특별관리구역에서는 전반적으로 질산성질소 농도의 감소 경향이 나타났는데, 이는 지하수 관리 측면에서 수질관리를 위한 적극적인 정책이 유효함을 시사한다. 본 연구에서는 제주도 지하수의 질산성질소 오염관리를 위한 적정 방안을 제안한다. The spatio-temporal variations of nitrate concentrations in groundwater of Jeju Island were evaluated by an analysis of time series groundwater quality data (N = 21,568) that were collected from regional groundwater monitoring (number of wells = 4,835) for up to 20 years between 1993 and 2015. The median concentration of NO 3 -N is 2.5 mg/L, which is slightly higher than those reported from regional surveys in other countries. Nitrate concentrations of groundwater in wells tend to significantly vary according to different water usage (of the well), administrative districts, and topographic elevations: nitrate level is higher in low-lying agricultural and residential areas than those in high mountainous areas. The Mann-Kendall trend test and Sen’s slope analysis show that nitrate concentration in mid-mountainous areas tends to increase, possibly due to the expansion of agricultural areas toward highland. On the other hand, nitrate concentrations in the Specially Designated Groundwater Quality Protection Zones show the temporally decreasing trend, which implies the efficiency of groundwater management actions in Jeju. Proper measures for sustainable groundwater quality management are suggested in this study.

회맹장 및 대장을 침범한 장 결핵에 있어서 바륨을 이용한 방사선 이중조영촬영 소견에 대한 연구

진용현,전혜정,이용근,강철호,조성범,김윤환,박철민,차상훈,김일영,이혜경 건국대학교 의과학연구소 2002 건국의과학학술지 Vol.12 No.-

To determine the characteristic double contrast barium enema findings of ileo-cecal and colonic tuberculosis and to make differential diagnosis from other bowel inflammatory disease. Sixty-seven patients confirmed as ileo-cecal and/or colonic-tuberculosis in six hospitals were evaluated retrospectively. The diagnosis was proven by endoscopic biopsy, surgery, and clinical follow up. Nine of 67 patients were excluded because radiologic findings were normal though endocopic biopsy examinations resulted in tuberculosis. Histopathological diagnosis were madein 58 cases as follows: endoscopic biopsy(n=29), operation(n=12), follow up examination(n=14), tissue culture(n=1), laparoscopic biopsy(n=2). There were 30 men and 28 females. The mean age were 36 yrs(range:16-67), 34 patients were in the second and third decade. The distribution of lesions, morphological characteristics, mucosal changes, ulcer shape and depth, associated with other tuberculous lesion, multiplicity were retrospectively analyzed in the findngs of double contrast barim enema. The commonest clinical symptoms were abdominal pain(n=35, 60%) and diarrhea(n=18, 31%). The chest radiography revealed association of pulmonary tuberculosis in 39 cases. Tuberculous lesions of other organs except chest were present in five cases. Double contrast barium enema findings showed a thickening and irregularity of intestinal mucosal fold(n=29, 50%), bowel contraction and/or shortening(n=26, 45%). There were small, nodular, superficial ulcers in the case of ulcer depth less than 2 mm in the depth. As many as 39 cases(67%) in this series had two or more lesions in the intestinal tuberculosis. The involved segment revealed symmetrical feature(n=21, 36%). Inflammatory pseudopolypoid lesions were noted in 30 cases(52%). The ileo-cecal region was involved in 38 cases(66%). The ascending colon(n=25, 43%) was the second commonest site with or without contiguous cecal involvement. Lesions in terminal ileum, ileo-cecal valve, transverse colon, descending colon and appendix were seen in 19, 18, 18, 12 and seven cases, respectively. Among 18 cases of ileo-cecal valve lesions, there were incompetency in nine cases(16%) and wide gapping in four cases(7%). In 14 cases, tuberculous enterocolitis was diagnosed by clinical follow-up and double contrast barium enema study. 12 out of 14 cases, the findings of double contrast barium enema of tuberculous enterocolitis were normalized after anti-tuberculous medication. However, two cases showed more aggravated state than before due to inappropriate treatment. Double contrast barium enema plays an important role in the diagnosis of tuberculous enterocolitis, determines the type, site and extent of the involvement and helps in treatment guide by using sequential studies.

구조물의 진동 저감에 관한 연구

윤득원,김진상 인제대학교 2004 仁濟論叢 Vol.19 No.1

본 연구에서는 건축물의 진동 저감에 관하여 연구하였다. 건축물의 진동을 저감하기 위한 방법 중에 면진구조와 제전구조에 관하여 상세히 다루고 이를 구조해석프로그램에 적용하여 해석 예제를 통해 면진구조와 제진구조의 효과에 대해 검정하였다. 먼저 현재 사용되고 있는 면진구조와 제진구조의 특성과 원리 그리고 종류를 분석하였다. 본 연구에서는 면진장치는 납삽입고무베어링형 면진장치와 마찰진자형 면진장치에 관하여 제진장치는 점탄성 감쇠기와 금속항복형 감쇠기에 관하여 다루었다. 면진 및 제진장치가 어떠한 동특성을 가지고 있는지를 파악하는 것이 가장 중요하다. 이를 통해 이들 장치가 지진하중에 대하여 어떠한 성능을 가지는지 알수가 있다. 그리고 면진 및 제진장치가 구조해적프로그램에서 어떻게 모델되어지는지 알아보고, 면진 및 제진장치가 갖는 재료적 비선형성으로 인해 이들 장치의 성능을 해석하기 위해서는 비선형 해석이 요구된다는 점을 알수 있었다. 또한 경계비선형 시간이력해석이 면진 및 제진 구조물의 특성상 비선형 거동이 주로 면진 및 제진 장치에서만 발생하는 점에 근거하여 모드중첩법을 이용하여 경계비선형 시간 이력해석의 이론적 배경을 설명하였다. 마지막으로 해석예제를 통하여 면진 및 제진장치의 효과를 검증하였다. This paper is study about reducing vibration of structure. In first, it have analysis matrial, losic, and kindness that theseday use of Earthquake-Resistance structure and Damping structure. This study is analysed about Lead Rubber Bearing type and Friction Pendulum System in Earthquake-Resistance structure and Viscoelastic Damper and Metalic Yield Damper in Damping structure. It is important to analysis what do Earthquake-Resistance structure and Damping structure have dynamic character. In this case, we know about what it have fuction of against earthquake. In the last, it probate an effection in the case of interprepation.

와이브로(WiBro) Model frame mapper Hardware 구조 설계

윤창중,임웅철,김진상,조원경,김영수,서덕영 경희-다반 ASIC 설계교육센터 2005 경희-다반 ASIC센터 논문집 Vol.6 No.-

WiBro는 하향 링크와 상향 링크를 시간으로 구분하는 TDD방식이 사용되며 다중접속 방식으로는 OFDMA가 사용된다. WiBro 서비스의 특징들은 frame Mapping 과정에서 잘 나타난다 frame은 하나의 frame당 42개의 symbol 단위로 mapping 되며 TFFT Block에서는 하나의 symbol 단위로 frame mapper에서 Data를 불러와 처리한 후 CP insertion, windowing 과정을 거쳐서 단말에 전송한다. 본 논문에서는 WiBro 서비스를 위하여 TTA에서 제정한 표준안을 토대로 모뎀부분을 VHDL 언어를 이용하여 하드웨어로 설계 하였고 Xilinx Vertex 8000을 Target Device로 이용하였다.

돈육의 저장중 이화학적 성질에 미치는 토코페롤 급여효과

진상근,김일석,송영민,하경희,이성대,김회윤 한국국제농업개발학회 2003 韓國國際農業開發學會誌 Vol.15 No.1

비육후기 돼지 사료에 첨가되는 우지 함량 중 2%를 들깨유로 대체 급여한 돈육(T1), T1처리구에 비타민 E 250ppm 첨가 급여한 돈육(T2), 우지함량 중 2%를 오징어유로 대체 급여한 돈육(T3), T3에 비타민 E 250ppm 첨가 급여한 돈육(T4)을 1±1℃에서 28일간 저장하면서 육질특성을 조사한 결과는 다음과 같다. 저장기간에 따라 육색 L^*과 b^*값, 지방색 b^*값 및 drip loss는 증가하였다. 총단백질추출성과 보수력은 14일까지 증가 후 감소하였으며, 염용성 단백질추출성 및 지방색 L^*값은 감소하였다. 근절길이에서는 저장기간에 따라 T3구는 감소하였다. 총단백질추출성은 T1보다는 T2가 낮은 반면 T3보다는 T4가 높았다. 염용성단백질추출성은 비타민 E 첨가구들이(T2, T4) 첨가하지 않은 구들(T1, T3)에 비하여 높았으며, drip loss와 육색 a^*값은 비타민 첨가구들이 첨가하지 않은 구들에 비해 낮게 나타났다. 보수력은 T1보다는 T2가 낮은 반면 T3보다는 T4가 높았다. 지방색 L^*값은 저장 1일째는 비타민을 첨가한 처리구들이 첨가하지 않은 처리구들에 비해 높았으나, 저장 28일째에는 낮게 나타났고, b^*값은 비타민을 첨가한 처리구들이 낮게 나타나 비타민 첨가구가 drip loss, 육색과 염용성단백질 추출성에서 좋은 효과를 나타내었다. The quality of pork meat was determined as following treatments. The meat samples were obtained from pigs which had been fed finishing pig diets containing 2% perillar seed oil in beef tallow(T1), 250ppm vitamin E in T1(T2), 2% squid oil substituted of beef tallow(T3), 250ppm vitamin E in T3(T4). During storage period, meat color L^*, b^* value, fat color b^* value and drip loss were increased. The extraction amount of total protein and water holding capacity were increased until 14 days after then were decrease. The extraction amount of salt soluble protein and fat color L^* value were decreased and sarcomere length were decrease in T2 as well. T1 was higher than T2 in the extraction amount of total protein and its of T4 was higher than T3. The extraction amount of salt soluble protein of the T2 and T4 was higher than that of T1 and T3. The drip loss and the a^* value of meat color were lower in vitamin treated one than non treated one. On water holding capacity. T1 was higher than T2 and T3 was lower than T4. The L^* value of fat in vitamin treated ones was shown higher than that of non treated ones on day 1, however, it and the b^* value of the meat were low on day 28.

기계적 처리와 금속촉매 오존산화에 의한 슬러지 감량화

윤상현,장현섭,이명주,황선진 경희대학교 2005 環境硏究 論文集 Vol.14 No.-

This research investigated the effect of mechanical pretreatment and ozone/catalytic oxidation on the reduction of sewage sludge. The pretreatment process was carried out to enhance sludge solubilization. The degree of solubilization was evaluated based on the DR. TS 1∼4% sludge was treated by ball mil using glass beads of 1 mm in diameter with the 50% (v/v) zircon bead loading. TS 4% showed 4 times higher solubilization efficiency than that of untreated sludge. The combination of the mechanical pretreatment and ozone/catalytic oxidation(10 mg Mn/g TS) showed higher efficiency than ozone/catalytic oxidation. At the 40% solubilization efficiency of sludge achieved by using ball mill, combination treatment showed 3 times higher than control. Ozone/catalytic oxidation improved the solid reduction effectively in the lower pH, presumably due to a high production of OH radical.

京畿道 廣州郡 및 富川郡에 있어서의 肺디스토마의 疫學的 調査

尹德鎭,金元撤,全世鍾,李俊鎬,金燉均,尹燾善,南相德 대한의학협회 1965 대한의학협회지 Vol.8 No.9