• 설비공학논문집
• /
• 제18권7호
• /
• pp.535-540
• /
• 2006

This study was performed In evaluate sleep efficiencies and conditions for comfortable sleep based on the analysis of Physiological signals under variations in thermal conditions. Five female subjects who have similar life cycle and sleep patterns were participated for the sleep experiment. It was checked whether they had a good sleep before the night of experiment. EEGs were obtained from C3-A2 and C4-A1 electrode sites and EOGs were acquired from LOC (left outer canthus) and ROC (right outer canthus) for REM sleep detection. Sleep stages were classified, then TST (total sleep time), SWS (slow wave sleep) latency and SWS/TST were calculated for the evaluation of sleep efficiencies on thermal conditions. TST was defined as an amount of time from sleep stage 1 to wakeup. SWS latency was from light off time to sleep stage 3 and percentage of SWS over TST was calculated for the evaluation of sleep quality and comfort sleep under thermal conditions. As result, the condition which raise a room temperature provided comfortable sleep.

• 콘크리트학회지
• /
• 제3권3호
• /
• pp.129-139
• /
• 1991

본 논문에서는 철근콘크리트 부재에 강섬유를 혼입하였을때의 역학적 겅동에 관하여 이론 및 실험적 연구를 수행하였다. 이를 위하여 포괄적인 실험연구를 수행하였으며, 단철근 콘크리트 보와 복철근 콘크리트 보에 대하여 강섬유의 혼입효과를 규명하였다. 본 실험으로부터 하중-처짐관계, 균열폭, 균열간격, 균열형상, 철근 및 콘크리트 변형도를 측정하였다. 실험결과 강섬유의 혼입으로 인하여 균열이 크게 역제되고 균열폭이 크게 감소함을 발견하였다. 또한, 부재의 연성과 극한저항모멘트가 크게증가하였다. 본 논문에서는 이러한 강섬유의 혼입효과를 설명할 수 있는 이론모델을 유도하여 제시하였으며, 앞으로 강섬유콘크리트는 연성을 필요로하는 내진구조물등에 효율적으로 이용할 수 있을 것으로 사료된다.

• 한국환경과학회지
• /
• 제5권1호
• /
• pp.25-33
• /
• 1996

This study was conducted to Investigate the biological treatment capability of MMCMAS(Movinig Media Complete Mixing Activated Sludge) reactor for high strength organic wastewater (Average BOD=800mg/l). And this experimental results were compared previous study for low strength organic wastewater (Average HOD=150mg/l) by the same reactor. In this study, we abtained following conclusions ; (1) The laboratory MMCMAS reactor demonstrated that SBOD removal efficiencies of more than 90% can be achieved at organic Bonding rates of 30.9 gBOD/$m^2$/d for high strength organic wastewater and 39.4 gBOD/$m^2$/d for low strength organic wastewater, respectively. (2) The nitrification rates of MMCMAS reactor was found same results of similiar organic loading rates. (3) The ratio of attached biomass to total biomass on the moving media varied in the range of 40 to 63% and 32 to 94% for high and low strength organic wastewater, respectively. And it was varied at the various concentration of influents for the similiar organic loading rates. The sludge production rates was found approximately 0.37 gVSS/$gBOD_{rem}$. in MMCMAS reactor.

• 한국실내디자인학회논문집
• /
• 제37호
• /
• pp.80-87
• /
• 2003

Contemporary shops play an important role as a place to experience contemporary culture as well as sales and display techniques. This study is to suggest one of the prototypes of character streets consisting of characteristic shops through the analysis of the stores in the SoHo area in New York City. The study found that there are three kinds of characteristic shops preserving the cast-iron architectural environment in the SoHo area. In the first case, the interiors of the shops are partially renovated original lofts keeping decorative columns, white plaster walls and wooden floors. In the second case, the interiors are totally renovated leaving no old traces. This is achieved through wrapping columns and replacing old materials with new ones. In the third case, the interiors are renovated with the different approaches using mixed ideas and materials. The original columns exist but are transformed in this case. In the third case, shops tend to be extra large and complicated. The Prada shop in SoHo by Rem Koolaas is the best example of this case. This shop is the conceptual city, theater and avant-garde museum itself, that is, the place of experiencing contemporary culture.

• 대한의용생체공학회:의공학회지
• /
• 제24권6호
• /
• pp.487-494
• /
• 2003

수면뇌파의 해석에 있어서 수면단계는 뇌파의 특성파 검출에 특히 중요하다. 수면단계는 여러 수면질환의 진단에 가장 기초적일 단서를 제공한다. 본 연구에서 수면뇌파 신호를 이산 웨이브렛 변환 뿐 만 아니라 퓨우리에 변환, 연속 웨이브렛 변환을 이용해서 해석하였다. 제안된 시스템 방범인 퓨우리에와 웨이브렛은 수면뇌파의 중요한 특성파(유파, 수면방추파, K복합, 구파 REM) 검출을 위해서 수면상태를 분석했다. 수면뇌파 분석에는 Daubechies 웨이브렛 변환 방법과 고속 퓨우리에를 이용했다. 모의실험결과 신경망 시스템이 특성 파형의 분류에 높은 성능을 발휘함을 알 수 있었다.

• Nuclear Engineering and Technology
• /
• 제35권2호
• /
• pp.108-120
• /
• 2003

In assessing the long term post closure radiological safety assessment of a potential HLW repository in Korea, three categories of uncertainties exist. The first one is the scenario uncertainty where series of different natural events are translated into written statements. The second one is the modeling uncertatinty where different mathematical models are applied for an identical scenario. The last one is the data uncertainty which can be expressed in terms of probabilistic density functions. In this analysis, three different scenarios are seleceted; a small well scenario, a radiolysis scenario, and a naturally discharged scenario. The MASCOT-K and the AMBER, probabilistic safety assessment codes based on connection of sub-modules and a compartment theory respectively, are applied to assess annual individual doses for a generic biosphere. Results illustrate that for a given scenario, predictions from two different codes fairly match well each other But the discrepancies for the different scenarios are significant. However, total doses are still well below the guideline of 2 mRem/yr. Detailed analyses with model and data uncertainties are underway to further assure the safety of a Korean reference dispsoal concept.

• The Journal of Asian Finance, Economics and Business
• /
• 제8권11호
• /
• pp.277-284
• /
• 2021

This study was conducted to determine the factors affecting employees' engagement in Information Technology (IT) enterprises in Vietnam. Quantitative method was used to test the research model. Research data is collected through a survey of 205 employees working in Ho Chi Minh City - Vietnam IT enterprises. The research results show that all seven factors affecting OC are ability, remuneration, training/development, challenging work, teamwork relationship, company policy, and culture, and work environment all make sense. In which, WOE, TER, REM factors are the three most influential factors, while company CPC, T&D, CHW, ABI have a lower impact. The proposed management implications include building, providing, ensuring a good working environment for employees, building/developing relationships within the company, having a policy of salary, bonus, support, and incentives. In addition, appropriate, competitive remuneration, adequate incentives, and rewards for the efforts that the employee has made, training and development of skills and soft skills suitable for each type of work, development orientations for employees, as well as frequent rotation of positions and jobs, in addition to improving employees' capacity, also avoid causing boredom and loss of motivation at work, thereby increasing OC of employees in IT enterprises in Vietnam.

• The Journal of Asian Finance, Economics and Business
• /
• 제8권10호
• /
• pp.327-339
• /
• 2021

This study examines the impact of bank restructuring on the financial performance of commercial banks in Vietnam. The data for this study was obtained from the audited financial statements of 30 Vietnamese commercial banks from 2007 to 2019. Multiple regression analysis was used for investigation. Financial performance, as evaluated by ROAA, ROEA, and NIM, is the dependent variable. Financial restructuring, ownership restructuring, and operational restructuring are the independent variables. Pooled least squares (Pooled OLS), fixed effects model (FEM), random effects model (REM), and system generalized moment regression model (System GMM) are the estimate methods used to increase the accuracy of the regression coefficient. The research results show that the variables of financial restructuring activities such as government intervention and the ratio of equity to total assets; variables of ownership restructuring such as capital adequacy ratio, privatization of state-owned commercial banks, mergers, and acquisitions; variables of operational restructuring such as employees, branches, the cost to total assets; GDP variables and the second restructuring period have a positive impact on financial performance. Variables such as debt-to-capital ratio, bad debt ratio, state ownership ratio, expense-income ratio, and inflation have a negative effect on financial performance.

• The Journal of Asian Finance, Economics and Business
• /
• 제8권5호
• /
• pp.785-793
• /
• 2021

The purpose of the research is to assess the factors affecting the liquidity of the commercial banks that are conducting mergers and acquisitions activities in Vietnam during the 2008-2018 period. This study employs samples based on 2-component data sets with cross-section and time-series data collected from the annual report of the State Bank and the audited acquisitions financial statements of nine commercial banks engaged in mergers and acquisitions activities. To carry out the research objectives, the authors conducted quantitative analysis through the Pooled OLS, REM, FEM and GMM models. The results shown that: (i) bank liquidity is positively affected by liquidity lagged, the return on equity (ROE) and economic growth; negatively affected by bank size, non-performing loan, short-run loan to deposit ratio; (ii) there is not enough evidence to conclude about the relationship between net profit margin, equity-to-assets ratio and inflation rate to bank liquidity; (iii) notably, we found evidence that, after the mergers and acquisitions, the liquidity of Vietnamese commercial banks decreased. The findings of this study suggest that bank managers take a more comprehensive view of the results of mergers and acquisitions and implications for banks to improve liquidity in the post-merger and acquisitions conditions.

• Journal of Obesity & Metabolic Syndrome
• /
• 제27권4호
• /
• pp.213-222
• /
• 2018

Bariatric surgery has evolved from a surgical measure for treating morbid obesity to an epochal remedy for treating metabolic syndrome as a whole, which is represented by type 2 diabetes mellitus. Numerous clinical trials have advocated bariatric or metabolic surgery over nonsurgical interventions because of markedly superior metabolic outcomes in morbidly obese patients who satisfy traditional criteria for bariatric surgery (body mass index [BMI] >$35kg/m^2$) and in less obese or simply overweight patients. Nevertheless, not all diabetes patients achieve the most desirable outcomes; i.e., diabetes remission after metabolic surgery. Thus, candidates for metabolic surgery should be carefully selected based on comprehensive preoperative assessments of the risk-benefit ratio. Predictors for diabetes remission after metabolic surgery may be classified into two groups based on mechanism of action. The first is indices for preserved pancreatic beta-cell function, including younger age, shorter duration of diabetes, and higher C-peptide level. The second is the potential for an insulin resistance reduction, including higher baseline BMI and visceral fat area. Several prediction models for diabetes remission have been suggested by merging these two to guide the joint decision-making process between clinicians and patients. Three such models, DiaRem, ABCD, and individualized metabolic surgery scores, provide an intuitive scoring system and have been validated in an independent external cohort and can be utilized in routine clinical practice. These prediction models need further validation in various ethnicities to ensure universal applicability.