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Dawa Zangpo(Dawa Zangpo ),Hironobu Nakane(Hironobu Nakane ),Morio Iino(Morio Iino ) 대한해부학회 2023 Anatomy & Cell Biology Vol.56 No.1
Studies describing the vascular systems and their variations in Situs inversus totalis (SIT) from a whole-body computed tomographic (CT) angiography perspective are lacking. We report a case of SIT in which postmortem CT angiography (PMCTA) was performed as a part of the forensic death investigation and incidentally detected several vascular variations in it. The PMCTA procedure was performed using the multiphase PMCTA protocol. Almost all major vessels were visualized, indeed in a completely reversed pattern. Contrast mixture flow interruptions were noted in the right coronary arterial branches suggesting possible blockage, upon which autopsy revealed >90% vessel occlusions at several locations. As such the cause of death was due to ischemic heart disease. Anomalous origins of the right internal mammary artery; abnormal left thyrocervical trunk and variations in the drainage of testicular veins were noted. Our findings might be helpful to clinicians and add to the body of literature on SIT.
NOx removal rate of photocatalytic cementitious materials with TiO<sub>2</sub> in wet condition
Seo, Dawa,Yun, Tae Sup Elsevier 2017 Building and Environment Vol.112 No.-
<P><B>Abstract</B></P> <P>Photocatalytic cementitious materials used in urban buildings are promising to mitigate air pollution sustainably. The changes of NO concentration in previous studies have been tested in dry condition while photocatalytic cementitious materials are mostly exposed to wetting and its water content continuously changes. This study presents the removal capacity of Nitrogen monoxide (NO) by using Titanium dioxide (TiO<SUB>2</SUB>) under wet condition. Under both dry and wet condition, NO removal rates were measured. For dry condition tests, dominant factors such as TiO<SUB>2</SUB> particle size, TiO<SUB>2</SUB> mass replacing ratio with respect to cement, and humidity were under consideration. The specimen under wet condition was subjected to the evaporation and the evolution of NO removal rate was continuously monitored. Results present that the recovery rate of removal capacity initially increased followed by the stationary phase where removal capacity stayed quasi-constant for a considerable time period in spite of continuous evaporation. Upon complete drying, the recovery rate was not fully restored due to the wetting experiment. The phenomena involved unique phases during evaporation were further discussed. The observation emphasizes that the consideration of wet condition is crucial to comprehend the NO removal capacity of photocatalytic cement-based materials in real urban environments.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NO removal capacity in photocatalytic materials dynamically changes in wet condition. </LI> <LI> The stationary phase in recovery rate exists in 60–70% despite continuous evaporation. </LI> <LI> Low humidity with small TiO<SUB>2</SUB> particles and 5% of mass replacing provide the maximum NO removal rate. </LI> </UL> </P>
Seo, Dawa,Yun, Tae Sup,Kim, Kwang Yeom,Youm, Kwang Soo American Society of Civil Engineers 2017 Journal of materials in civil engineering Vol.29 No.5
<P>To mitigate flood damage in cities, pervious concrete has been developed as a viable and sustainable alternative to traditional concrete to facilitate drainage. Previous studies have tended to evaluate the drainage capacity of pervious blocks through permeability and drainage tests in simplified conditions, giving little consideration to multiple environmental factors such as rainfall rate and temporal changes in the blocks' drainage capacity. This study presents experimental results of the runoff and drainage capacity of pervious blocks subjected to time-dependent evaporation and corresponding changes in their degree of saturation. Different levels of repeated water charging at designated time intervals simulated the urban environment, and both runoff and drainage were continuously monitored. The results highlight that runoff can take place after certain time intervals despite the same water charge because of evaporation and prewetting-induced changes in water-retention capacity. The effects of the surface layer, the bedding layer, and clogging (all part of the urban areas) on the drainage were also observed. The findings underscore the significance of the actual, rather than the simplified laboratory-based, drainage capacity in urban areas. (C) 2016 American Society of Civil Engineers.</P>
Removal of methylene blue using lemon grass ash as an adsorbent
Singh, Harminder,Dawa, Tshering B. 한국탄소학회 2014 Carbon Letters Vol.15 No.2
Wastewater from textile industries is a major cause of water pollution in most developing countries. In order to address the issues of water pollution and high cost for treatment processes, the use of an inexpensive and environmentally benign adsorbents has been studied. The objective was to find a better alternative to the conventional methods. Lemon grass waste (ash) collected from a lemon grass stream distillation subunit in Bhutan was tested for dye removal from aqueous solutions. The study investigated the removal of methylene blue using the following operational parameters: initial concentration (100-600 mg/L), contact time, adsorbent dose (0.1-0.55 gm/100 mL), and pH (3-10). It was found that the percentage removal of dye increased with a decrease of the initial concentration and increased contact time and dose of adsorbent. The basic pH solution of dye showed better adsorption capacity as compared to the acidic dye solution. Langmuir and Freundlich adsorption isotherms were fitted to the data well. Data fitted better to Lagergren pseudo 2nd order kinetics than a 1st order kinetic model. Surface morphology was also examined via scanning electron microscopy. An elemental analysis was also carried out and the chemical composition and functional groups were analyzed using energy dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy techniques, respectively. The obtained results indicate that lemon grass ash could be employed as a low cost alternative to commercial activated carbon in wastewater treatment for the removal of dyes.
광촉매 이산화티타늄(TiO<sub>2</sub>)을 혼합한 도로 포장재의 습윤 조건에서의 성능 변화에 관한 실험적 연구
서다와,윤태섭,Seo, Dawa,Yun, Tae Sup 한국지반공학회 2016 한국지반공학회논문집 Vol.32 No.5
본 연구는 도심지의 도로 환경을 고려하여, 기능성 포장 재료 중 하나인 이산화티타늄($TiO_2$)을 포함한 시멘트 모르타르의 실질적인 일산화질소(NO) 제거 성능을 평가하고자 하였다. 실험은 크게 두 가지로, 유입되는 기체의 습도에 따른 NO 제거율 변화 실험과 시편의 포화도에 따른 NO 제거율 변화 실험으로 구성되었다. 습도 변화 실험에서는 건조 상태의 시편을 대상으로 유입 기체의 습도를 변화시키며 NO 제거율을 관찰하였다. 습도-NO 제거율 곡선은 로그 정규 분포 형상으로, 특정 습도에서 최대 NO 제거율이 나타났다. 포화도 변화 실험은 강우 및 생활 하수로 인하여 불포화 상태인 도로를 반영하고자 습윤 상태인 시편을 대상으로 하였다. 습윤 상태의 시편은 건조 상태보다 낮은 NO 제거 성능을 보였으며 증발이 진행되면서 $TiO_2$가 노출되어 NO 제거 성능이 증가하였다. 그리고 시편의 특정 깊이 아래에 존재하는 $TiO_2$는 NO 제거 성능에 크게 기여하지 않는 것으로 나타났다. This study aims to present the practical Nitrogen monoxide (NO) removal capacity of cement mortar with Titanium dioxide ($TiO_2$) which is one of the paving materials by considering the environment of pavement in urban areas. NO removal capacity test under designated conditions of humidity of inflow gas and the test with variation of the degree of saturation of specimen were conducted. In the test for humidity, dry specimen is subject to the test and NO removal ratio was observed. Humidity-NO removal ratio curve is a log normal distribution in shape, and the maximum NO removal ratio appears at specific humidity. NO removal capacity test relying on the degree of saturation was carried out with wet specimen to reflect the unsaturated pavement by rainfall and domestic sewage. Wet specimen presents less NO removal capacity than dry specimen and the recovering evolution of NO removal capacity follows evaporation. Moreover, $TiO_2$ under the specific depth of specimen hardly contributes to NO removal capacity.
Song, Woon Young,Jeong, Dawa,Kim, Jimin,Lee, Min Wook,Oh, Man Hwan,Kim, Hak Joong American Chemical Society 2017 ORGANIC LETTERS Vol.19 No.3
<P>Acinetobactin is a major siderophore utilized by the human pathogen Acinetobacter baumannii. The rapid acquisition of drug resistance by A. baumannii has garnered concern globally. Herein, acinetobactin and systematically generated analogues were prepared and characterized; the binding and cellular delivery of Fe(III) by the analogues were evaluated. This investigation not only led to the clarification of the physiologically relevant acinetobactin structure but also revealed several key structural elements for its functionality as a siderophore.</P>