• 대한환경공학회지
• /
• 제34권10호
• /
• pp.651-655
• /
• 2012

본 연구에서는 천연 무기소재로부터 합성된 무기개량제의 슬러지 탈수능 개선 효과를 상용 유기고분자응집제와 비교 평가하였다. 2.0 mg/g sludge TS의 주입량에서 무기개량제는 여과시간, 여과비저항계수, 탈수케이크 함수율, 탁도를 각각 146에서 41초로, $8.3{\times}10^{14}$에서 $2.4{\times}10^{14}$ m/kg로, 82.1에서 77.1%로, 112에서 61.1 NTU로 향상시켰으며, 이는 상용 양이온 유기고분자 응집제에 필적하는 성능이었다. 따라서 무기개량제를 하수슬러지의 대체 개량제로서 활용 가능할 것으로 판단된다. 각 탈수능 성능지표 간의 상호 관계를 분석한 결과, 여과시간, 여과비저항계수, 탈수케이크 함수율 간에 강한 상호관계가 확인되었다.

• 대한약리학회지
• /
• 제24권2호
• /
• pp.217-220
• /
• 1988

Patt등이 1949년 처음으로 cysteamine과 히utathione등이 정상조직의 방사선 내성을 증가시킨다는 사실을 규명한 이후로 많은 방사선 방어제가 연구되어 왔으나, 그들의 독성때문에 임상적적용이 매우 제한되었다. 본 실험에서는 3개의 sulfur기를 지닌 환상구조의 Trithioformaldehyde(TTFA)를 합성하여 방사선 조사 후 생존율에 대한 영향과 마우스 공장 소낭선 세포에 대한 방호 효과를 관찰하였다. TTFA 2.0 g/kg을 방사선 조사 15분 전에 복강내로 투여하고 800 rad를 조사한 후 30일간 관찰했을 때 78%의 생존율을 보였다. 또, 공장 소낭선에 대한 실험에서 TTFA는 1.0g/kg과 2.0g/kg에서 공장 소낭선에 대한 protection factor가 각각 1.17와 1.23 임을 나타냈다.

• 대한물리치료과학회지
• /
• 제10권2호
• /
• pp.7-16
• /
• 2003

The purpose of this study was to investigate the effect of Treadmill Training with FES(TTF) on walking velocity, gait endurance, and energy expenditure index(EEI) of hemiplegia patients with foot drop. Two subjects with hemiplegia participated in this study. They took walking excercise 5 times per week for 8 weeks. One time excercise spent 30minutes. The theraputic effect was evaluated by how many seconds they needed to walk 10 meters, how far they could walk for 12 minutes, and how much they spent energy in walking for 12 minutes. Two cases were examined before, after 4 week, and after 8 week, walking training. The results of this study are as follows; 1) Walking velocity : Case 1 increased from 0.52m/sec before walking training to 0.83m/sec after 8 weeks. Case 2 increased from 0.58m/sec to 0.92m/sec. 2) Gait endurance : Case 1 increased from 383.23m to 625.53m. Case 2 increased from 410.19m to 693.47m. 3) EEI : For comfortable walking condition, Case 1 decreased from 0.98beats/min to 0.71beats/min, and Case 2 decreased from 0.93beats/min to 0.68beats/min. For maximum walking condition, Case 1 decreased from 0.93beats/min to 0.67beats/min, and Case 2 decreased from 0.91beats/min to 0.61beats/min. The findings suggest that hemiplegia patients can improve their walking velocity, gait endurance and energy expenditure index through TTF.

• 한국동물학회:학술대회논문집
• /
• 한국동물학회 2003년도 한국생물과학협회 학술발표대회
• /
• pp.163.4-163
• /
• 2003

No Abstract, See Full Text

• 유통과학연구
• /
• 제18권1호
• /
• pp.107-121
• /
• 2020

Purpose: Shared mobility services are the most notable in the shared economy; however, they have yet to be activated in Korea due to various regulations and conflicts amongst stakeholders. Nevertheless, shared mobility has become an irresistible trend of the times, as it can cause a great deal of economic and environmental benefits. In this vein, the purpose of this study is to contribute to the revitalization of shared mobility services in Korea and to provide service providers with implications for developing consumer-oriented marketing strategies. Research design, data and methodology: Based on the reasons that the users do not use shared mobility service, the factors influencing the behaviors of shared mobility users are structured and analyzed in a reliable, technical and procedural manner. To this end, the theory of reasoned action (TRA) of Ajzen and Fisbbein, the initial trust model (ITM), task technology fit (TTF) and switching cost (SC) are adopted. A total of 202 questionnaires were collected from the respondents who were aware of shared mobility. Then statistical processing of the collected data used SmartPLS(v.3.2.8), a PLS-SEM (Partial Least Squares Structural Equation Modeling) analysis program. The steps of the analysis are as follows. First, a PLS-Algorithm analysis was performed to evaluate the measurement model, and a Bootstraping and Blindfolding analysis was performed to evaluate the structural model and verify the hypotheses. Second, a multi-group analysis (PLS-MGA) was conducted to further analyze the differences depending on whether or not users experienced shared mobility service. Results: The results showed that initial trusts model (ITM) and task technology fit (TTF) have positive effects on users' behaviors through the mediation of the intention to use. As opposed to the assumption, switching costs did not have negative moderating effects in relation to the intention to use and users' behaviors. The influence of IT self-efficacy was significant, depending on the prior experience to use shared mobility services. Conclusions: This study will contribute to the revitalization of domestic shared mobility services and the formulation of service providers' marketing strategies. In future studies, there is a need to explore, reconstruct, and validate factors other than the impact factors of the shared mobility services used in this research model.

• 유기물자원화
• /
• 제10권2호
• /
• pp.125-131
• /
• 2002

본 연구에서는 폐굴껍질과 황토를 사용하여 하수슬러지를 탈수개량성을 평가하였다. 농축슬러지와 소화슬러지의 탈수특성을 평가하기 위해 Jar Test와 Buchner Funnel Test를 실시하였다. TTF(Time to Filter), SRF(Specific Resistance to Filtration)를 슬러지 탈수 특성의 평가 지표로 하였다. 굴껍질과 황토를 혼합해 제조된 탈수개량제가 굴껍질 단독으로 만들어진 것보다 탈수성이 더 높았다. 굴껍질과 황토와 결합하는 과정에서, 굴껍질의 비율이 황토의 비율보다 더 높은 혼합비율에서의 탈수성이 높다는 사실을 발견하였다. 농축슬러지와 소화슬러지의 처리에서 탈수성이 가장 적합한 혼합은 굴껍질:황토의 비가 9:1이었다.

• 상하수도학회지
• /
• 제29권2호
• /
• pp.203-209
• /
• 2015

The purpose of this study is to estimate the applicability of a stable anaerobic digester using a separator membrane to the preprocessing thickening process. The results of the experiments showed about a 47.16% weight loss rate for the sludge under anaerobic condition, and about 41.17% under intermittent aeration condition. The concentrations of rejection water were $SCOD_{Cr}$ 25 mg/L, T-N 16.6 mg/L, and T-P 1.4 mg/L on the average under the intermittent aeration condition, which were lower than the concentrations of rejection water under an anaerobic condition. As for the factors affecting the reduction of the flux, correlation analyses of TTF, MLSS, $SCOD_{Cr}$, and $EPS_{Protein}$, $EPS_{Polysacchride}$ resulted in -0.97, -0.95, -0.84 and -0.86, -0.95, respectively, which showed that TTF had the highest correlation to the reduction of the flux. In addition, it was concluded that MLSS, $SCOD_{Cr}$ and $EPS_{Protein}$, $EPS_{Polysacchride}$ also have close correlations. The results are considered to show that, in the case of the process using a tubular membrane in the preprocessing process of an anaerobic digester, an intermittent aeration condition of the thickener considering the contamination of the membrane and load of rejection water is appropriate for the stable preprocessing process.

• Bulletin of the Korean Chemical Society
• /
• 제19권3호
• /
• pp.340-344
• /
• 1998

A facile synthesis of 4,5-(1',2'-diphenylethylenedithio)-1,3-dithiole-2-thione (dPhEDT-DTT) is carried out via a Diels-Alder type [2+4] cycloaddition reaction of 1,3-dithiol-2,4,5-trithione oligomer and t-stilbene. Molecular structure of dPhEDT-DTT is determined by x-ray crystallography: space group P1, a=11.694(3) Å, b=12.117(3) Å, c=14.688(3) Å, α=113.12(2)°, β=102.23(2)°, γ=107.02(2)°, V= 1699.1(7) Å3, Z=2. It turns out that dPhEDT-DTT crystallizes as a racemic compound consisting of (R,R) and (S,S) enantiomers. Coupling reaction of dPhEDT-DTO undergone in neat P(OEt)3 yields TTF(SEt)4 instead of ET derivative. When PR3 (R=OEt, OPh, Ph) is used in benzene, toluene or xylene, however, dPhEDT-DTO is decomposed.

• 한국동물위생학회지
• /
• 제40권2호
• /
• pp.139-142
• /
• 2017

A six-year-old male captive nutria (Myocastor coypus) maintained in a closed space with a small vent was found dead in his cage. Gross findings showed multifocal nodules in varying sizes, small 0.5 to large 5 cm in diameter, intermixed with normal parenchyma were scattered all over the surface of the lungs and a kidney, which the cut surface was smooth, compact and whitish in color. Microscopically, small round to oval neoplastic cells with modest to slight amounts of cytoplasm formed acinar and gland-like structures. Immunohistochemically, cells were strongly positive for E-cadherin and slightly reactive for thyroid transcription factor-1 (TTF-1). Based on those diagnostic features, the neoplasia was diagnosed as primary pulmonary adenocarcinoma (small cell type) and metastasized into the kidney. This is the first case report of malignant pulmonary tumor and its metastasis in the nutria.

• Journal of Veterinary Science
• /
• 제23권6호
• /
• pp.89.1-89.7
• /
• 2022

It is challenging to diagnose metastatic tumors whose cellular morphology is different from the primary. We characterized canine primary pulmonary adenocarcinoma (PAC) and its xenografted tumors by histological and immunohistochemical analyses for critical diagnostic and cancer stem cell (CSC) markers. To generate a tumor xenograft model, we subsequently transplanted the tissue pieces from the PAC into athymic nude mice. Immunohistochemical examination was performed for diagnostic (TTF-1, Napsin A, and SP-A) and CSC markers (CD44 and CD133). The use of CSC markers together with diagnostic markers can improve the detection and diagnosis of canine primary and metastatic adenocarcinomas.