Mathematical analysis of bio-convective micropolar nanofluid

Sohail Nadeem,Muhammad Naveed Khan,Noor Muhammad,Shafiq Ahmad 한국CDE학회 2019 Journal of computational design and engineering Vol.6 No.3

The present investigation concentrates on three dimensional unsteady forced bio-convection flow of a viscous fluid. An incompressible flow of a micropolar nanofluid encloses micro-organisms past an expo-nentially stretching sheet with magnetic field is analyzed. By employing convenient transformation the partial differential equations are converted into the ordinary differential equations which are non-linear. By using shooting method to solved these equations numerically. The influence of the determining parameters on the velocity, temperature, micro-rotation, nanoparticle volume fraction, microorganism are incorporated. The skin friction, heat transfer rate, and the microorganism rate are analyzed. The results depicts that the value of the wall shear stress and Nusselt number are declined while an enhance-ment take place in the microorganism number. The slip parameters increases the velocity, thermal energy, and microorganism number consequentially. The present investigation are important in improv-ing achievement of microbial fuel cells

Atomic hydrogen driven size control of catalytic nanoparticles for single-walled carbon nanotube growth

Hee Jin Jeong,Laurent Eude,Manoharan Gowtham,Bernd Marquardt,Sung Hun Lim,Shaïma Enouz,Costel Sorin Cojocaru,Kyung Ah Park,이영희,디디에르프리밧 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2008 NANO Vol.3 No.3

The effects of an atomic hydrogen (Hat) pretreatment of the catalyst layer on the low temperature growth of single-walled carbon nanotubes (SWCNTs) have been investigated using a modified catalytic chemical vapor deposition system. Well-defined and isolated individual Fe nanoparticles as a catalyst are successfully formed on the defects with high trapping energy which are created on the Al2O3 surface by Hat pretreatment, yielding highly dense SWCNTs. The pretreatment mechanism of Hat, compared to H2, is also discussed. It was also found that the quality of SWCNTs can be enhanced when Hat is flowed with CH4 during nanotubes growth at low temperature. In this case, the undesired carbon products and defects on catalyst seeds and nanotubes walls can be selectively removed by Hat. Therefore, it is essential to use Hat in pretreatment stage for increasing catalytic activity and keep the size of nanoparticles in the nm range. Hat can also be employed in growth stage for enhancing SWCNTs quality and density at low temperature.

How to Develop Future Internet Medical Care? : A Case Study of China

Sha-Sha SHEN(Sha-Sha SHEN),Shu-Feng XIAO(Shu-Feng XIAO) 동아시아경상학회 2022 The East Asian Journal of Business Economics Vol.10 No.4

Purpose – With the increasing medical demands of the public, the development of future Internet medical care has come to represent a major problem. Therefore, the purpose of this study is to discuss future development strategies for Interne medical care while taking China’s Internet hospitals as an example case. Research design, data, and methodology – This study conducted a case study of China’s Internet hospitals to summarize the fundamental problems faced by Internet hospitals and propose future development strategies to overcome these problems for Internet medical care. Result – Although Internet hospitals have been regarded as the ultimate product of Internet medical care, from the perspective of the government, medical institutions, platforms builders and maintainers, and patients, they still face some basic issues. Conclusion – This study concludes that the government and medical institutions play an important role in the future development of Internet medical care and suggests that the government should make overall plans for the policies and standards and should play the main role in enhancing the public trust in Internet medical care, while medical institutions should take steps such as seizing policy opportunities, driving online and offline collaborations, and constructing suitable evaluation systems to promote the development of Internet medical care.

Exploring Curriculum Ideology and Politics of “Patriotic Sentiments”: A Case Study of “Introduction to Three-Su Culture”

Sha Sha HONG KONG ACADEMY OF SOCIAL SCIENCES 2023 Journal of Social Science Development Research Vol.1 No.1

Curriculum Ideology and Politics, as a new educational concept, is a new requirement, measure, and direction for strengthening talent cultivation and ideological and political education in higher education in the new era. In recent years, Curriculum Ideology and Politics has been gradually implemented and implemented in higher education institutions, with “Patriotic Sentiments” being one of the key components of Curriculum Ideology and Politics in universities. “Introduction to Three-Su Culture” is a compulsory public course offered by Sichuan Technology and Business University. It has a limited number of class hours but covers a wide range of content and involves diverse student backgrounds. Therefore, when planning the course, teachers should incorporate ideological and political education throughout the curriculum. They should adhere to a student-centered approach and design various activities during and after class to inspire students' learning, aiming to enhance their cultural literacy.

3-D Deformation Behavior Simulation of Cable Stitch Based on Particle System in Weft Knitted Fabrics

Sha Sha,Lei Luo,Zhongmin Deng,Dapeng Yuan,Bin Li,Xuewei Jiang,Hui Tao,Qufu Wei 한국섬유공학회 2018 Fibers and polymers Vol.19 No.9

The static simulation of weft knitting can be efficiently realized by graphics simulation techniques, but there still remains a challenge for mechanical models. The lack of practical mechanical models significantly limit the realistic deformation behaviors of complex cable stitches, which lead to a great different between the simulation effect and the actual fabric. In order to obtain the deformation behavior and volumetric performance of cable stitch, loop models were built based on an improved particle system in this work. Compared with plain weft knitted, the offset value of bonding points of cable stitches were measured. By analyzing the relationship between the deformation of loops and the displacement of the particles, the deformation behavior of cable stitch was simulated. Velocity-Verlet integration was introduced to simulate cable stitches and the stable results were obtained. The results show that these models and algorithm displayed the accurate deformation behavior of cable stitches, as demonstrated by qualitative comparisons to measure the deformations of actual samples.

Research on the Micro-Motivations of Enterprise Asset Backed Securitization

Huang, Sha-Sha(황사사),Lee, Dong-Young(이동녕) 한국산업경제학회 2018 산업경제연구 Vol.31 No.2

세계적으로 자산 담보 증권의 활성화 추세는 경제 위기 이후 약화되었다. 그러나 중국은 2012년에 자산 담보 증권화를 재개했으며, 기업 자산 담보 증권화가 은행 신용 자산 담보 증권화를 초과함에 따라 개발 추세가 본격화되었다. 따라서 본 연구는 중국의 기업 자산 담보 증권화의 급속한 발전 동기를 연구하여 관련 부서가 기업 자산 담보 증권화 추진 요인을 정확하게 이해하고 기업 자산 담보 증권화의 건전한 발전을 보다 잘 유도 할 수 있도록 기여한다. 본 논문에서는 2012 년부터 2017 년까지 자산 담보 증권화를 수행하는 상장 기업을 선정하고 유동성 동기, 자금조달 동기 및 수익성 동기의 관점에서 기업 자산 담보 증권화의 미묘한 동기를 연구하기 위해 다중 회귀 모형을 구축하여 연구를 진행하였다. 그 결과 자산 규모가 더 크고 유동 자산 회전율이 낮고 금융 위기가 심하고 생산성이 낮으며 영업 이익이 낮은 기업이 자산 유동화를 수행 할 가능성이 더 큰 것으로 나타났다. 규모가 크고 자산 부채 비율이 높은 회사는 자산 담보 증권화가 더 많으며 상당한 규모의 경제 효과를 가질 수 있는 것으로 나타났다. 그러나 규제 당국은 수익성이 낮고 재정이 열악한 기업의 증권화 오용을 인식하고 있어야 한다. The developmental momentum of global asset backed securitization weakened after the economic crisis. However, China restarted asset backed securitization in 2012, and the developmental momentum is in full swing as the enterprise asset backed securitization has exceeded the bank credit asset backed securitization. Therefore this paper studies the motivations of the rapid development of enterprise asset backed securitization in China so relevant departments can correctly understand the drivers of enterprise asset backed securitization and better guide the healthy development of enterprise asset backed securitization. This article selects the listed companies that conduct asset backed securitization from 2012 to 2017 and builds multiple regression models to research the micro-motivations of enterprise asset backed securitization from the perspectives of liquidity motivation, financing motivation and profitability motivation. The results show that companies that have larger assets, have slower current assets turnover rates, are in deeper financial distress and with weak production and operating profits are more likely to conduct asset backed securitization. The companies with larger scales and higher asset-liability ratios have more asset backed securitization and can have a significant scale economy effect. However, regulators must be aware of the misuse of securitization by companies that have poor profitability and poor finances.

Effects of Rad51 on Survival of A549 Cells

Yu, Sha-Sha,Tu, Yi,Xu, Lin-Lin,Tao, Xue-Qin,Xu, Shan,Wang, Shan-Shan,Xiong, Yi-Feng,Mei, Jin-Hong Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.1

Rad51, a key factor in the homologous recombination pathway for the DNA double-strand break repair, plays a vital role in genesis of non-small-cell lung cancer (NSCLC). In recent years, more and more studies indicate that high expression of Rad51 is of great relevance to resistance of NSCLC to chemotherapeutic agents and ionizing radiation. However, the underlying molecular mechanisms are poorly understood. In this study, we investigated the role of single Rad51 on cell viability in vitro. Our results show that depletion of endogenous Rad51 is sufficient to inhibit the growth of the A549 lung cancer cell line, by accumulating cells in G1 phase and inducing cell death. We conclude that independent Rad51 expression is critical to the survival of A549 cells and can be an independent prognostic factor in NSCLC patients.

다이어트 슬리밍과 셀룰라이트/피하지방 분해물질의 마이크로갭슐을 고착화시킨 보정속옷의 바디라인 개선효과

김샤샤 ( Sha Sha Kim ),안경민 ( Kyung Min Ahn ) 대한미용학회(구 대한미용과학회) 2011 대한미용학회지 Vol.7 No.1

Cellulite is a common phenomenon that particularly affects the thighs and buttocks of women. In fact, no treatment is completely successful as none are more than mildly and temporarily effective. Despite the lack of evidence to support efficacy, treatment options continue to proliferate. In this study, diet slimming inner wear and regular correction inner wear to examine the effect of the diet slimming and cellulite/subcutaneous fat tissue lysis. The fixed textile with the microcapsules were washed and shape of microcapsules were observed by SEM. 23~53 Years old healthy 10 female (BMI>23 kg/m2 and body fat>25%) were divided in to 2 groups (regular correction inner wear and diet slimming wear) and observed the change of body weight, fat mass, body fat, BMI, wait-, hip- and thigh-circumference, thickness of abdominal-and thigh-fat tissue by Inbody and ultrasonography before and after two weeks wearing. As a result, the diet slimming wear textile spherical type between microfiber fabric that is microencapsulated (Bodyfit, CLA, HCA, Caffeine and cellulite lysis aroma oil) fixation was the dense, three due to the decreased number of microencapsulated form became a flat. Therefore, the microencapsulated fabric can be useful for a wear special cosmetic application. And not only waist-, hip-and thigh-circumference as body line indicators were decresed but also the abdominal- and thigh-subcutaneous fat tissue as a diet parameter were reduced more in diet slimming wear group than in regular correction inner wear group. Improvement effect of diet slimming and body line was revealed in diet slimming wear group. Diet slimming wear may be absorbed by the skin contact and appeared to be satisfied within two week. Thus, it is suggested that microencapsulated and fixed diet slimming inner wear may be very high usability for a convenient and cost-effective and efficient new cosmetic material in modern society.

A Study on the Effects of Credit Asset Securitization in China

Huang, Sha Sha(황사사),Lee, Dong Young(이동녕) 글로벌경영학회 2018 글로벌경영학회 학술대회 발표논문집 Vol.2018 No.2

서브프라임 위기 후 전세계적으로 자산유동화가 급격히 감소하였다. 그러나 중국은 글로벌 트랜드 에 역행하여 2012년 자산유동화 시범사업을 재개하였다. 그 결과 2017년 말 까지 여신자산의 유동화 총액의 규모가 3조441억 위안에 달했다. 그중 여신자산의 유동화 1조778억 위안에 달하였다. 신용자산 유동화는 중국에서 급속도로 발전하였다. 이는 중국 정부에 의하여 여신자산 유동화가 추진되었기 때문이다. 보유자산을 충분히 사용하기 위하여 대대적으로 여신자산의 유동화를 추진하였다. 그러나 많은 중소 상업은행들이 증권화에 대해 보수적인 태도를 보이고 있으며, 자산 유동화 증권의 발행 규모가 작고 그 빈도도 낮다. 중국의 자산유동화에 관한 연구는 자산증권화 업무의 발전 속도에 크게 뒤떨어졌다. 그 이유는 다음과 같다. 첫째, 중국 자산증권화의 도입이 늦었고 금융위기로 인한 증권화가 활발하지 못했다. 이는 증권화 연구 데이터 부족 및 중단으로 이어졌으며. 중국의 자산증권화에 관한 선행연구는 이론연구 위주로 수행 되었다. 둘째, 기존 실증연구는 대부분 타국의 데이터를 사용하여 자산유동화 효과를 분석하였다. 이리한 연구는 중국의 자산유동화의 발전 및 경험의 토대가 되었다. 그러나 중국의 경제금융 환경, 증권거래 구조, 자산의 질 등이 다른 나라와 현저한 차이가 있다. 따라서 다른 국가에서의 자산유동화 적용효과는 중국의 실제 상황에 적합하지 않을 수 있다. 셋째, 중국 데이터를 분석 대상으로 하는 몇몇 실증연구가 수행되었으나, 여신자산 유동화의 효과의 한 측면 에 치중하고 있으며, 어떤 연구 결과는 서로 모순된다. 따라서 중국 여신자산 유동화 발전 및 연구 현황은 그 영향의 효과를 정확하게 이해하는 것이 더욱 시급하다. 본 연구는 2008년부터 2017년까지 94개 시중은행의 연간 데이터를 분석 대상으로 패널복석. 차분 GMM법과 시스템 GMM추정법 등 다양한 통계방법을 채택하여 유동성, 위험성, 수익성 세 가지 관점에서 은행여신자산 유동화의 미시효과를 전면적으로 분석한다. 본 논문은 세 가지 분석을 수행하였다. 첫째, 분석기간에 적어도 1기 여신자산 유동화 업무를 한 적이 있는 모든 상업은행을 분석 대상으로 증권화가 상업은행에 미치는 영향을 연구한다. 둘째, 자산유동화를 수행한 표본을 대상으로 규모별 상업은행에 대해 이질적인 분석을 진행한다. 셋째, 자산증권화 업무를 하지 않은 42개 시중은행을 표본에 포함하여 유동화한 경우 와 유동화하지 않은 경우의 그룹간 분석을 진행한다. 넷째, 변수의 교체 및 다양한 추정 방법을 채택하여 강건성을 검정한다. 마지막으로, 본 연구는 신용자산증권화가 어떻게 상업은행의 수익성에 영향을 미치는지 분석한다. 연구결과는 다음과 같다. 신용자산증권화가 상업은행의 유동성을 현저히 높일 수 있다는 것을 발견했고, 대규모 상업은행도 마찬가지였다. 그러나 증권화가 소규모 상업은행 유동성에 미치는 영향은 대략 1년 늦춰졌다. 또 증권화 사업을 하는 상업은행은 증권화를 하지 않는 것보다 유동성이 더 높다. 신용자산증권화는 상업은행의 안정성을 높이고 파산 위험을 낮출 수 있다.그러나 현저한 효과를 가져오지 못하였다. 대규모와 소규모의 상업은행이 모두 이와 같다. 증권화를 하지 않은 상업은 행에 비해 증권화된 상업은행은 안정성과 파산위험이 낮다. 신용자산증권화는 증권화팀 상업은행의 이윤을 낮췄다. 소규모 상업은행도 그렇지만 대규모 상업은행도 자산증권화 사업을 통해 수익성을 높일 수 있다. 증권화 팀의 상업은행은 비증권화팀의 상업은행보다 더 높은 이윤 능력을 가지고 있다. 듀폰 분석을 통해 자산증권화가 상업은행의 순자 산 수익률은 낮추는 것은 주로 이윤율을 낮추어 실현한 것이다 본 글은 상업은행의 증권화 업무를 전개하고 정부 감독 부서가 증권화를 촉진하는 지속적인 발전을 유도하는 각도에서 대책을 건의하였다. 첫째, 상업은행은 증권화의 전체 국면을 종합하여 장기적인 계획을 강구하고, 자신의 실정과 결합하여 자산증권화 발전의 전반적인 장기 계획안을 수립해야 하며, 가장 적절한 시기에 증권화를 진행하거나 적절한 증권 발행 규모를 확정해야 한다. 둘째, 정부 부처는 제도적인 보장, 증권화 정보공개 시스템의 완화, 증권화 유통의 2단계 시장을 형성하여 부실자산증권화의 발전을 정확하게 이끌어야 한다. 셋째, 제3자 중개기관의 발전을 지원 하고 추진한다. Since the subprime crisis, the global asset securitization business has declined sharply. But China has reversed the trend and restarted the asset securitization project in 2012, and the total asset securitization amounted to 3.441 trillion yuan by the end of 2017. Credit asset securitization was even more unique, with the issuance amount reaching 1.778 trillion yuan. Asset securitization has mushroomed in China. The reason is that credit asset securitization is driven by the government in China. The government proposes to develop the credit asset securitization significantly to activate the stock assets. However, small and medium-sized commercial banks are conservative about securitization and have low issuance and low frequrency. Literature research on asset securitization seriously lags behind the development speed of the asset securitization in China. The reasons are as follows. Firstly, asset securitization emerges lately, and it is interrupted by the financial crisis, resulting in a shortage and interruption about research data. Therefore, existing Chinese literature mainly focuses on theoretical research and case analysis. Secondly, most of the empirical studies provide experience for China s asset securitization by analyzing data from other countries. However, there are significant differences from other countries in the economic and financial environment, the structure of the securities transaction, and the quality of the underlying assets in China. The application effect of asset securitization in other countries may not be suitable for the actual situation of China. Thirdly, some empirical studies conducted by Chinese data only focus on one aspect of securitization effect, and some research results are opposite. Therefore, it has become more urgent to understand its impact correctly under the current situation and research status of credit asset securitization in China. This paper analyzes the annual data of 94 Chinese-funded commercial banks from 2008 to 2017. It comprehensively examines the micro-effects of the credit asset securitization from three perspectives of liquidity, risk, and profitability by adopting multiple statistical methods such as panel regression, differential GMM, and systematic GMM estimation. I perform three analyses for credit asset securitization. Firstly, it analyzes within the securitization group, that is, explore the impact of credit asset securitization on commercial banks that have carried out at least one-period securitization. Secondly, there is the heterogeneity analysis of the effects of asset securitization on commercial banks of different sizes within the securitization group. Thirdly, this paper conducts study between the securitization group and the non-securitisation group included 42 commercial banks that have not carried out credit asset securitization. Finally, the paper performs the robustness testing by replacing variable or changing estimation methods. At the same time, the paper analyzes the influence path of asset securitization on the profitability of commercial banks. The results are as follows. Credit asset securitization can significantly improve the liquidity of commercial banks. The same is true for large-scale commercial banks. But the effect on the liquidity of small-scale commercial banks will be delayed by one period. Commercial banks that do securitization have higher liquidity than those that do not. Credit asset securitization can improve the stability of commercial banks and reduce the risk of bankruptcy. The same is true for large-scale and small-scale commercial banks. However, the effect is not significant. Because the scale of securitization is small, and the government restricts the types of underlying assets. Commercial banks that have carried out securitization have higher stability and lower bankruptcy risk compared with commercial banks that have not carried out securitization business. The impact of credit asset securitization on

진공흡입기와 초음파 미용기기를 활용한 마사지의 팽창선조 개선 효과

김샤샤 ( Sha Sha Kim ),신규옥 ( Kyu Ok Shin ),윤영한 ( Young Han Yun ),김기영 ( Ki Young Kim ) 한국미용학회 2009 한국미용학회지 Vol.15 No.1

Striae distensae (stretch marks) is common disfiguring skin disorder of significant cosmetic concern. In this study, improvement effects on stretch marks skin were investigated by non invasive method such as esthetic massage. Four young women as volunteers had the Striae distensae (rubra or alba) induced skin on thighs, abdomen and back of over body who were treated 8 times in 4 weeks with aroma oils, vacuum suction and ultrasonic esthetic apparatus massage. Thereby content of melanin and erythema on normal and Striae distensae induced skin was measured by mexameter and took a photo before and after treatment. In the result, content of melanin on Striae distensae induced skin of all volunteers was higher than that of normal skin, and melanin deposition was reduced after 3 or 4 times massage treatment. But content of erythema was decreased in three volunteers. A size and length of three women on Striae distensae induced skin was decrease, but one woman has shown no effect who have a born Striae distensae alba at the gross observation. In conclusion, measurement of melanin content may be used for Striae distensae diagnostic indicator and aroma oils, vacuum suction and ultrasonic esthetic apparatus combinated massage could be a possibility of no invasive care method for Striae distensae rubra induced skin. However those method have shown no effect on Striae distensae alba.