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초음파 (US)와 다양한 파장범위의 자외선 (UV) 조사에 따른 DEP 분해특성에 관한 연구
나승민 ( Seung Min Na ),( Jin Hua Cai ),신동훈 ( Dong Hoon Shin ),( Ming Can Cui ),김지형 ( Jee Hyeong Khim ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.7
Diethyl phthalate (DEP) is widely spread in the natural environment as an endocrine disruption chemicals (EDs). Therefore, in this study, ultrasound (US) and ultraviolet (UVC), including various applied power density (10-40 W/L), UV wavelengths (365 nm, 254 nm and 185 nm) and frequencies (283 kHz, 935 kHz) were applied to a DEP contaminated solution. The pseudo-first order degradation rate constants were in the order of 10-1 to 10-4 min-1 depending on the processes. Photolytic and sonophotolytic DEP degradation rate also were high at shortest UV wavelength (VUV) due to the higher energy of photons, higher molar absorption coefficient of DEP and increased hydroxyl radical generation from homolysis of water. Sonolytic DEP degradation rate increased with increase of applied input power and the dominant reaction mechanism of DEP in sonolysis was estimated as hydroxyl radical reaction by the addition of t-BuOH, which is a common hydroxyl radical scavenger. Moreover, synergistic effect of were also observed for sonophotolytic degradation with various UV irradiation.
채금화 ( Jin Hua Cai ),나승민 ( Seung Min Na ),안윤경 ( Yun Gyong Ahn ),이세반 ( Se Ban Lee ),김지형 ( Jee Hyeong Khim ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.4
In this study, Ibuprofen (IBP) degradation by the photo catalytic process was investigated under various parameters, such as UV intensity, optimum dosage of TiO2, alkalinity, temperature and pH of bulk solution. The pseudo-first order degradation rate constants were in the order of 10-1 to 10-4 min-1 depending on each condition. The Photocatalytic IBP degradation rate increased with an increase in the applied UV power. At high UV intensity a high rate of tri-iodide (I3 -) ion formation was also observed. Moreover, in order to avoid the use of an excess catalyst, the optimum dosage of catalyst under the various UV intensities (30 and 40 W/L) was examined and ranged from approximately 0.1 gL-1. The photo catalytic IBP degradation rate was changed depending on the alkalinity and temperature and pH in the aqueous solution. This study demonstrated the potential of photo catalytic IBP degradation under different conditions.
China’s Position on the Proliferation Security Initiative and Its Reappraisal
Min-Cai Yu (사) 이준국제법연구원 2010 Journal of East Asia and International Law Vol.3 No.1
China did not join the Proliferation Security Initiative due to deep legal and policy considerations. China now has sufficient reasons to reappraise its existing stance in light of the establishment and continuous development of a positive, cooperative and comprehensive Sino-U.S. relationship, institutionalization of the PSI by U.S. President Barack Obama, and new changes in nuclear nonproliferation and disarmament. China’s participation in the PSI will be much more useful in enhancing the construction of international nonproliferation systems rather than remaining disengaged. Now it is the time for China to make the political decision and participate in the PSI.
Ai-min Cai 한국유통과학회 2013 한국유통과학회 학술대회 논문집 Vol.2013 No.-
Based on the analysis of the universal management process of small and medium-sized automobile service enterprise in China in the current stage, makes an empirical study on the way of carrying out the 8S site management in small and medium-sized automobile service enterprises, and puts forward the feasible scheme to establish a long-term mechanism of 8S management, in order to enhance the competitiveness of enterprises.
Feature-preserving, Adaptive and Anisotropic Smoothing Algorithm for Triangular Mesh Models
Liu Xu-min,Yang Li-xin,Li Cai-ling 보안공학연구지원센터 2014 International Journal of Multimedia and Ubiquitous Vol.9 No.11
Despite the great success in smoothing of triangular mesh, the classical methods mostly require human interactions. In order to reduce the parameter settings, an adaptive and anisotropic smoothing algorithm for removing noise and preserving features of triangular mesh model was proposed. First calculate the expected normal vector of the model triangles, the expected normal vector should be an accurate representation of the desired movement direction and be similar to the original surface normal vector, and then we compute the value of the offset value. We develop an adaptive coefficient scheme which can avoid the parameter settings to obtain the coefficient value for each vertex. Finally, we updated every vertex’s position of the model by formula. Experimental results show that the algorithm can be adaptive to preserve sharp features and avoid shrinkages by comparing with classical methods.
Cai, Gangri,Lee, Wonjoo,Min, Sun-Ki,Koo, Gumae,Cho, Byung Won,Lee, Soo-Hyoung,Han, Sung-Hwan American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.12
<P>The selective swelling behavior of polyelectrolyte multilayer (PEM) films prepared by layer-by-layer (L-b-L) assembly influences the ion-permeability in contrast to surface charge density of the films. The cation terminated polyethylene amine (PEI) and anion terminated polyacrylic acid (PAA) were dissolved in DI water, and the pH was adjusted to 10 and 4, respectively, exemplifies thick denser film with good layering structure. The layered polyelectrolyte films has selective swelling behavior at pH 4 (PEI) or pH 10 (PAA), influences the permeability of both Ru(NH3)6(2+) and Fe(CN)6(3-) rather than surface charge character or film charge density. The swollen top most layer shows 'on' character, whereas, shrunken top most layer shows 'off' character for the ion-permeability. Such 'on-off' character can be used for the pH-dependent switches based on surface morphology.</P>
Cai, Hao,Fujimoto, Keisuke,Lim, Jong Min,Wang, Chaojie,Huang, Weiming,Rao, Yutao,Zhang, Senmiao,Shi, Hui,Yin, Bangshao,Chen, Bo,Ma, Ming,Song, Jianxin,Kim, Dongho,Osuka, Atsuhiro WILEY‐VCH Verlag 2014 Angewandte Chemie Vol.126 No.41
<P><B>Abstract</B></P><P>Direct β‐to‐β linked branched and cyclic porphyrin trimers and pentamers have been synthesized by the Suzuki–Miyaura coupling of β‐borylporphyrins and β‐bromoporphyrins. The cyclic porphyrin trimer, the smallest directly linked cyclic porphyrin wheel to date, and its twined pentamer, exhibit small electrochemical HOMO–LUMO gaps, broad nonsplit Soret bands, and red‐shifted Q‐bands, thus indicating large electronic interactions between the constituent porphyrin units.</P>