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Ri-guang Jin,Shuang Kun Zhang,Wei Wei Liu,Hui Bo Zhang,Seung Kon Ryu 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.3
Molecular weight distribution of copolyacrylonitrile, which was obtained from precipitation copolymerization without and with using dispersants in mixed solution, is studied. The contribution ratio of liquid phase polymerization and solid phase polymerization under different polymerization conditions could be worked out through the formula,which has been deduced in literature. From the calculated results, common points of each reaction system are, i) contribution ratio (r) of solid phase to liquid phase decreases with the increase of water content; thus the solid phase polymerization is gradually strengthened, which is apt to form chain of high molecular weight, ii) the higher temperature leads to higher compatibility between water and DMSO; thus the solid phase polymerization contribution would decrease,while the value of r is considerably larger. The limit molecular weight distribution of the system without dispersants in 100% water is approaching to 2; thus the corresponding r becomes larger, the molecular weight distribution ratio (Q) decreases in the system with dispersants.
Improvement of Conversion Efficiency of Atom-Molecule Bose-Einstein Condensate
Guang-Ri Jin,김상욱 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.II
We investigate the stimulated Raman adiabatic passage in two-color photoassociation for an atom-molecule Bose-Einstein condensate. By applying two time-varying Guassian laser pulses that fulfill the generalized two-photon resonance condition, we obtain highly efficient atom-molecule conversion. The efficiency depends on the free-bound detuning and the delay time between the two pulses. By adjusting the parameters optimally, we achieve 92 $\%$ conversion efficiency
Assessment of Landslide Susceptibility using the PCA and ANFIS with Various Metaheuristic Algorithms
Zelu Chen,Hechun Quan,Ri Jin,Aifen Jin,Zhehao Lin,Guangri Jin,Guang-Zhu Jin 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.4
It is very important for the susceptibility assessment and disaster prediction of the region to effectively evaluate the landslide susceptibility. In this study, Particle Swarm Optimization (PSO), Artificial Bee Colony algorithm (ABC), Shuffled Frog Leaping Algorithm (SFLA) and Bat algorithm (BAT) are used to optimize Adaptive Neuro-Fuzzy Inference System (ANFIS) to evaluate the landslide susceptibility. 811 sample points were collected through remote sensing analysis and field investigation for susceptibility analysis. Fifteen landslide evaluation factors were quantified and normalized, and the Principal Component Analysis (PCA) method was used to compress them into 6 main factors. The accuracy analysis results of the area under the curve (AUC), Root Mean Square Error (RMSE) and Mean Absolute Error (MAE) evaluation models show that the AUC values of PSO, ABC, SFLA and BAT are 93.6%, 96.2%, 90.8% and 86.1%, respectively. Among them, the accuracy of ABC is the highest. This study effectively evaluates the landslide susceptibility through a new neural network hybrid method, which provides a theoretical basis for landslide disaster susceptibility management.
병해충 이미지의 데이터 셋과 증강에 대한 최근 동향 조사
이지민,YIN HELIN,Ri Zheng,Dong Jin,구영현,유성준 한국차세대컴퓨팅학회 2022 한국차세대컴퓨팅학회 학술대회 Vol.2022 No.05
병해충으로 인한 피해가 날이 갈수록 커지고 있다. 특히 고위험 문제 병해충의 피해를 최소화하기 위해서는 병해충의 빠른 진단은 필수이다. 최근 인공지능 기술의 발전으로 많은 병해충 진단 연구에서는 딥러닝 기술을 사용하고 있다. 하지만 병해충은 계절성을 띄고 있고 정확한 병해충 이미지를 수집하기 위해서는 전문가의 도움이 필요하기 때문에 정확한 병해충 이미지 수집에 한계가 있다. 부족한 병해충 이미지를 늘리기 위해 본 논문에서는 현재 제공되고 있는 병해충 이미지 데이터 셋과 최신의 데이터 증강(Data Augmentation) 연구를 조사했다.
Li, Qing Ri,Dong, Guang Ri,Park, Sook Jin,Hong, Yong Rae,Kim, In Su,Jung, Young Hoon WILEY‐VCH Verlag 2013 European journal of organic chemistry Vol.2013 No.20
<P><B>Abstract</B></P><P>A concise asymmetric formal synthesis of (–)‐swainsonine from readily available <SMALL>D</SMALL>‐erythronolactone is described. The key steps include a highly diastereoselective amination of a chiral benzylic ether, which occurs with the retention of stereochemistry using chlorosulfonyl isocyanate, and a palladium‐catalyzed decarboxylative <I>N</I>‐allylation of an allyl carbamate.</P>