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>

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

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.

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.

폐산과 폐알칼리를 이용한 폐지류의 전처리

진양오,윤철종,우성훈,최성우,김익성,박승조 동아대학교 환경문제연구소 1999 硏究報告 Vol.22 No.1

The objective of this study were to treat waste paper with waste acid and alkali so to enhance maturity of the wastes. The sample was office paper and news paper which ratio was 1:1 and the reagents for pre-treatment were sulfuric acid and sodium hydroxide for waste acid and alkali. The maturity indices were taken volatile solid. cation exchange capacity, and gas production variation. The pre-treatment method was to dip the sample in the reagent according to time, concentration, and dosage. The methods of treatment were to dip the wastes in leachate and to landfill in soil. The result of this study were as follow. When waste paper was treated by acid and alkali, the proper treatment condition was 24hours and 0.1 normality of acid and alkali. The pre-treated samples with acid and alkali such as RSN and RSH were more effective in maturity than non-treated sample such as RS. The post-treated sample such as RSL, RSNL, and RSHL was more effective than nonpost-treated sample such as RS, RSN, and RSH.

방광 크롬친화세포종과 동반된 배뇨후 벼락두통

하윤석,강성진,허소영,이지현,김민정,김종국,김광수 고신대학교 의과대학 2009 고신대학교 의과대학 학술지 Vol.24 No.1

Thunderclap headache is a hyperacute, severe headache that is so named because the pain strikes suddenly and severely, and is sometimes a sign of a medical emergency. We report a case of pheochromocytoma in the urinary bladder in a 48-year-old woman who presented with recurrent thunderclap headache after voiding and exercise. So we think thunderclap headache during or immediately after micturition may be an important diagnostic clue of bladder pheochromocytoma.

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 楊州郡에 있어서의 肺디스토마의 疫學的 調査

尹德鎭,金晟烈,李俊鎬,金燉均,柳殷學 대한의학협회 1965 대한의학협회지 Vol.8 No.4

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.

정조대 토목공사의 의의와 역사문화환경으로의 보존 : 인공호수 만석거를 중심으로 Focused on the Man-made Lake Manseokgeo

윤진영,이상해 대한건축학회 2005 대한건축학회논문집 Vol.21 No.2

The present research is to present a plan to preserve the man-made lake Manseokgeo which is a city foundation establishment related to Hwaseong Fortress in Suweon which has been registered as World Cultural Heritage in 1997, as a historical cultural environment. In order to obtain this object, we studied 1) the meaning and role of the influence of the construction of Manseokgeo on the society of its time based on the social situation when Manseokgeo Was constructed, 2) the state and role of the meaning of Manseokgeo as a historical cultural environment in current cities based on the significance of the construction of the man-made lake Manseokgeo, according to the transformation of the city as a historical cultural environment in the city, and finally 3) the plan to preserve and manage Manseokgeo as a historical cultural environment. The plan to preserve and manage has been presented in two aspects: one is a plan in the aspect of improving the physical environment, which is a plan to restore the scenery of Manseokgeo, and the other is a plan in the aspect of non physical management, which is a plan to appoint it as a historical park. The significance of the present research is to enlarge the subjects being preserved in historical cities so that they can expand city foundation establishments which support us to carry on city life.