http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Zhihui Ding (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Synthesis of AlON powders through a polymerization template approach by spark plasma sintering
Zhihui Ding,Wemshi Zheng,Fei Chen,Ik Jin Kim,Wulong Liu,James F. Shackelford,Hyoung-Won Son,Tadachika Nakayama,Sukyoung Kim,Young-Hwan Han,Jooseong Kim 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.4
As a new wet chemical method, polymer template strategy uses monomer polymerization to form a continuous carbonnetwork. The carbon skeleton can make the carbothermal reduction reaction take place in the original, thus preventing theexcessive agglomeration of grains. The Al2O3 / C ceramic precursor were obtained by polymer template strategy, and thenAlON powders with 3 μm size were synthesized through a spark plasma sintering (SPS) method at 1,650 °C. We confirmedthat a continuous network of carbon chains was formed by polymerization to encapsulate the alumina powder, so as to reducethe contact growth of the grains during the high-temperature carbothermal reaction. We established that, when the mass ratioof carbon source to alumina was 1.6:10, the pure AlON powder could be prepared by calcining at 1,650 °C for 20 min in aflowing nitrogen atmosphere.
-
Zhihui Wu,Chunhui Shen,Shanjun Gao,Xi Zhu,Mingliang Zhang,Ao Ding 한국고분자학회 2021 Macromolecular Research Vol.29 No.3
A series of proton exchange membranes were prepared by incorporating phosphonic functionalized siloxane into sulfonic poly(2,6-dimethyl-1,4-phenyleneoxide) (SPPO) and imidazole functionalized poly(2,6-dimethyl-1,4-phenyleneoxide) grafted with siloxane (IPPO-Si). Phosphonic acid functionalized siloxane was synthesized from amino trimethyl phosphonic acid (ATMP) and (3-aminopropyl)triethoxysilane (APTES). FTIR results showed that 1-methylimidazole and APTES were successfully grafted onto polyphenylene oxide, and APTES successfully formed Si-O-Si crosslinked networks through hydrolytic crosslinking. The membranes were thermally stable up to 220 °C and exhibited excellent oxidative stability and mechanical performance. We also measured the proton conductivity of the membranes. The results showed that the proton conductivities of the composite membranes increased with the increasing of SPPO content at different degrees under high (100 °C-160 °C) and low (25 °C-80 °C) temperature conditions. Furthermore, the IPPO-SI-P/SPPO-30 has the best conductivity, reaching to 0.1131 S cm-1 at 80 °C, 100%RH and 0.1049 S cm-1 at 160 °C, 5%RH, respectively. Therefore, this novel membrane acts as a potential candidate for proton exchange membranes with a wider applicable temperature (25 °C-160 °C).
-
Rare event and default probability of debt
Xiaopei Ding,Zhihui Gu,Liyuan Han 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
Since the global financial crisis broke out, the plunge of stock prices, shrinkage of asset value, and downgrading of credit ratings for companies bonds, have greatly challenged the long-established mathematical models based on Black-Scholes option pricing formula in Finance. Evidences show that the important assumption that the returns dynamics of the underlying stock have a continuous sample path which can be described by the stochastic process deviates from the real world situation. In this paper, I took the pattern of stock price movement as a process driven by the combination of the geometric Brownian motion and Poisson Process, and study the important factors affecting the default probability of corporate debt using MATLAB to do numerical simulation. It is found that: (a) in the occurrence of the “rare event” the adoption of the model only based on pure geometric Brownian motion will lead to underestimation of bankruptcy risk. (b) the degree of asset value shrinkage following each “negative jump” is positively correlated with the default risk of corporate debt, and this default probability is a convex function of the corresponding jumping probability per unit time. (c) the marginal default probability is a non-negative random variable that varies as the times of asset “jumps” before the maturity of the corporate debt are different. Moreover, it will reach the maximum value when jumping probability and the degree of asset value shrinkage both approach to 100%. (d) when the degree of asset value shrinkage maintains unchanged, the greater the initial leverage ratio d, the higher default risk the company will face. Consequently, the agency problem between shareholders and creditors is likely to take place.
-
Transilient Variance and Credit risk
Liyuan Han,Zhihui Gu,Xiaopei Ding 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
In the context global financial crisis, the variance of financial asset return is no longer constant. It means that the applicability and the ability of interpretation of the B-S option pricing model based on the constant variance assumption have been challenged unprecedented. To this end, this paper built on the basis of transilient variance pricing model seeks to exampine the pricing of American options and its applications in the pricing of corporate debt value and in the measure of the probability of corporate debt default. According to the derivation of theoretical model and the reuslt of numerical simulation, we get the following conclusions. Firstly, the constant variance model which neglects the transilient risk of firm will result in the underestimate of the probability of debt dafault. As the asset value of firm declines, the greater the jump of risk is, the greater the understimate of the probability of debt defalult is. Secondly, in the transilient variance model, if the corporate asset value declines along with transilient risk, the probability of corporate debt default will jump greatly. Combined with the financial and market data of relevant agencies, we find that if the variance of asset returns jumps suddenly, the probabilities of debt default will increase greatly. Thirdly, as the rise of risk-free rate of return, the probability of corporate debt default will decline, This result indicates that if the givernment cut base interset rates, the interests of creditors may be damaged. In the transilient variance model, the risk of risk-free rate of return will reduce the jump of the probability of debt default induced by the rise of risk. The risk-sensitive coefficient of the probability of corporate debt default has a negative relation with the risk-free rate of return.
-
Xiguo Ren,Yiming Zhang,Haijun Tao,Zhihui Zeng,Jianzhi Ding 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.10
Subsea communication system is a key component of marine electromagnetic exploration system. In subsea communication system, only the power line channel model is fully studied, it could help to achieve high-speed and reliable power line carrier communication. In this paper, a channel model is established by using the theory of multi conductor transmission. The single Pi structure, double Pi structure and T structure cable model have been simulated through the Spice. The accuracy of single Pi structure model was verified by measurement and simulation. It provides a guiding role for the whole communication system.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
