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Zhi-Bin Hu,He-An Luo,Xiao-Guang Wang,Ming-Zhi Huang,Lu Huang,Huai-Lin Pang,Chun-Hui Mao,Hui Pei,Chao-Qun Huang,Jiong Sun,Ping-Le Liu,Ai-Ping Liu 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
In attempt to lead compounds exhibiting both insecticidal and fungicidal activities, a series of O-benzyl oximeether derivatives were designed and synthesized by introducing β-methoxyacrylate pharmacophore into a scaffold. The insecticidal activity against Aphis fabae and the fungicidal activity against Erysiphe graminis were screened. The title compounds exhibited remarkable insecticidal and fungicidal activities. The most potent compound 6d was identified. Its insecticidal LC50 against A. fabae is 6.4 mg/L, which is lower than that of chlorfenapyr (19.4 mg/L) and even close to the level of imidacloprid (4.8 mg/L). Its fungicidal EC90 in preventive and curative treatment against E. graminis are 2.2 and 4.8 mg/L, respectively, which are lower than azoxystrobin (7.0 and 5.9 mg/L). These results indicate that compound 6d can be considered as a lead for further developing new O-benzyl oxime-ether typed candidates with both fungicidal and insecticidal activities.
Impact of cable sag on the efficiency of an inertial mass damper in controlling stay cable vibrations
Zhi-hao Wang,Hui Gao,Yan-wei Xu,Zheng-qing Chen,Hao Wang 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.24 No.1
Passive negative stiffness dampers (NSDs) that possess superior energy dissipation abilities, have been proved to be more efficient than commonly adopted passive viscous dampers in controlling stay cable vibrations. Recently, inertial mass dampers (IMDs) have attracted extensive attentions since their properties are similar to NSDs. It has been theoretically predicted that superior supplemental damping can be generated for a taut cable with an IMD. This paper aims to theoretically investigate the impact of the cable sag on the efficiency of an IMD in controlling stay cable vibrations, and experimentally validate superior vibration mitigation performance of the IMD. Both the numerical and asymptotic solutions were obtained for an inclined sag cable with an IMD installed close to the cable end. Based on the asymptotic solution, the cable attainable maximum modal damping ratio and the corresponding optimal damping coefficient of the IMD were derived for a given inertial mass. An electromagnetic IMD (EIMD) with adjustable inertial mass was developed to investigate the effects of inertial mass and cable sag on the vibration mitigation performance of two model cables with different sags through series of first modal free vibration tests. The results show that the sag generally reduces the attainable first modal damping ratio of the cable with a passive viscous damper, while tends to increase the cable maximum attainable modal damping ratio provided by the IMD. The cable sag also decreases the optimum damping coefficient of the IMD when the inertial mass is less than its optimal value. The theoretically predicted first modal damping ratio of the cable with an IMD, taking into account the sag generally, agrees well with that identified from experimental results, while it will be significantly overestimated with a taut-cable model, especially for the cable with large sag.
Wang, Chong-Zhi,Hou, Lifei,Wan, Jin-Yi,Yao, Haiqiang,Yuan, Jinbin,Zeng, Jinxiang,Park, Chan Woong,Kim, Su Hwan,Seo, Dae Bang,Shin, Kwang-Soon,Zhang, Chun-Feng,Chen, Lina,Zhang, Qi-Hui,Liu, Zhi,Sava-Se The Korean Society of Ginseng 2020 Journal of Ginseng Research Vol.44 No.2
Background: Ginseng is a commonly used herbal medicine in treating various medical conditions. Chronic gut inflammation is a recognized factor for the development of colorectal cancer (CRC). In this project, Asian ginseng berry polysaccharide preparations were used to assess their effects on CRC and related immune regulation mechanisms. Methods: Ginseng berry polysaccharide extract (GBPE) and purified ginseng berry polysaccharide portion (GBPP) were used to evaluate their activities on human HCT-116 and HT-29 CRC cell proliferation. Interleukin-8 secretion analysis was performed on HT-29 cells. Naive CD4 cell isolation and T-helper cell differentiation were performed and determined using flow cytometry for Th1 and Treg in addition to cell cycle and apoptotic investigation. Results: GBPE and GBPP significantly inhibited interleukin-8 secretion and cancer cell proliferation, inhibited CD4<sup>+</sup>IFN-γ<sup>+</sup> cell (Th1) differentiation, and decreased CD4<sup>+</sup>FoxP3<sup>+</sup> cell (Treg) differentiation. Compared to the GBPE, GBPP showed more potent antiinflammatory activities on the malignant cells. This is consistent with the observation that GBPP can also inhibit Th1-cell differentiation better, suggesting that it has an important role in antiinflammation, whereas Treg cells hinder the body's immune response against malignancies. Supported by cell cycle and apoptosis data, GBPE and GBPP, at various degrees, remarkably enhanced the anticancer activities of 5-fluorouracil. Conclusion: Data from this project suggested that Asian ginseng berry potentially has clinical utility in managing enteric inflammation and suppressing CRC through immunomodulation mechanisms.
Lossless VQ Indices Compression Based on the High Correlation of Adjacent Image Blocks
( Zhi-hui Wang ),( Hai-rui Yang ),( Chin-chen Chang ),( Gwoboa Horng ),( Ying-hsuan Huang ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.8
Traditional vector quantization (VQ) schemes encode image blocks as VQ indices, in which there is significant similarity between the image block and the codeword of the VQ index. Thus, the method can compress an image and maintain good image quality. This paper proposes a novel lossless VQ indices compression algorithm to further compress the VQ index table. Our scheme exploits the high correlation of adjacent image blocks to search for the same VQ index with the current encoding index from the neighboring indices. To increase compression efficiency, codewords in the codebook are sorted according to the degree of similarity of adjacent VQ indices to generate a state codebook to find the same index with the current encoding index. Note that the repetition indices both on the search path and in the state codebooks are excluded to increase the possibility for matching the current encoding index. Experimental results illustrated the superiority of our scheme over other compression schemes in the index domain.
Hiding Secret Data in an Image Using Codeword Imitation
Wang, Zhi-Hui,Chang, Chin-Chen,Tsai, Pei-Yu Korea Information Processing Society 2010 Journal of information processing systems Vol.6 No.4
This paper proposes a novel reversible data hiding scheme based on a Vector Quantization (VQ) codebook. The proposed scheme uses the principle component analysis (PCA) algorithm to sort the codebook and to find two similar codewords of an image block. According to the secret to be embedded and the difference between those two similar codewords, the original image block is transformed into a difference number table. Finally, this table is compressed by entropy coding and sent to the receiver. The experimental results demonstrate that the proposed scheme can achieve greater hiding capacity, about five bits per index, with an acceptable bit rate. At the receiver end, after the compressed code has been decoded, the image can be recovered to a VQ compressed image.
Sharing a Large Secret Image Using Meaningful Shadows Based on VQ and Inpainting
( Zhi-hui Wang ),( Kuo-nan Chen ),( Chin-chen Chang ),( Chuan Qin ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.12
This paper proposes a novel progressive secret image-hiding scheme based on the inpainting technique, the vector quantization technique (VQ) and the exploiting modification direction (EMD) technique. The proposed scheme first divides the secret image into non-overlapping blocks and categorizes the blocks into two groups: complex and smooth. The blocks in the complex group are compressed by VQ with PCA sorted codebook to obtain the VQ index table. Instead of embedding the original secret image, the proposed method progressively embeds the VQ index table into the cover images by using the EMD technique. After the receiver recovers the complex parts of the secret image by decoding the VQ index table from the shadow images, the smooth parts can be reconstructed by using the inpainting technique based on the content of the complex parts. The experimental results demonstrate that the proposed scheme not only has the advantage of progressive data hiding, which involves more shadow images joining to recover the secret image so as to produce a higher quality steganography image, but also can achieve high hiding capacity with acceptable recovered image quality.
류지혜 ( Zhi Hui Liu ),왕지강 ( Zhi Gang Wang ),이병오 ( Byung Oh Lee ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2010 강원 농업생명환경연구 Vol.22 No.-
Based on the survey conducted in Peking, Tianjin and Shijiazhuang, this article analyzes the social characteristics of consumers, consumption behavior changes and the factors that influence the consumers` WTP by using Binary Logistic Model. It is demonstrated that most consumers have no confidence on milk safety because of the Melamine-tainted Milk Incident. And after the incident, consumer`s purchasing behavior has changed a lot not only on the consumption but also on the brand choice. According to the binary logistic analysis result, consumer`s age, educational level, health, whether they think price and brand are important, and their concern about the incident have significant influence on consumer`s willingness to pay for the milk safety. Based on the conclusion, the article puts forward some policy recommendations for government and corporations, such as increasing consumer`s confidence of food by improving the food safety system, inspiring the risk communication not only by traditional tool but also make good use of the internet, changing product strategy from low price and low quality into high quality, safer and more expensive products.
Hu, Zhi-Bin,Luo, He-An,Wang, Xiao-Guang,Huang, Ming-Zhi,Huang, Lu,Pang, Huai-Lin,Mao, Chun-Hui,Pei, Hui,Huang, Chao-Qun,Sun, Jiong,Liu, Ping-Le,Liu, Ai-Ping Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
In attempt to lead compounds exhibiting both insecticidal and fungicidal activities, a series of O-benzyl oximeether derivatives were designed and synthesized by introducing ${\beta}$-methoxyacrylate pharmacophore into a scaffold. The insecticidal activity against Aphis fabae and the fungicidal activity against Erysiphe graminis were screened. The title compounds exhibited remarkable insecticidal and fungicidal activities. The most potent compound 6d was identified. Its insecticidal $LC_{50}$ against A. fabae is 6.4 mg/L, which is lower than that of chlorfenapyr (19.4 mg/L) and even close to the level of imidacloprid (4.8 mg/L). Its fungicidal $EC_{90}$ in preventive and curative treatment against E. graminis are 2.2 and 4.8 mg/L, respectively, which are lower than azoxystrobin (7.0 and 5.9 mg/L). These results indicate that compound 6d can be considered as a lead for further developing new O-benzyl oxime-ether typed candidates with both fungicidal and insecticidal activities.
Chong-Zhi Wang,Lifei Hou,Jin-Yi Wan,Haiqiang Yao,Jinbin Yuan,Jinxiang Zeng,Chan Woong Park,Su Hwan Kim,Dae Bang Seo,Kwang-Soon Shin,Chun-Feng Zhang,Lina Chen,Qi-Hui Zhang,Zhi Liu,Clara Sava-Segal,Chun 고려인삼학회 2020 Journal of Ginseng Research Vol.44 No.2
Background: Ginseng is a commonly used herbal medicine in treating various medical conditions. Chronic gut inflammation is a recognized factor for the development of colorectal cancer (CRC). In thisproject, Asian ginseng berry polysaccharide preparations were used to assess their effects on CRC andrelated immune regulation mechanisms. Methods: Ginseng berry polysaccharide extract (GBPE) and purified ginseng berry polysaccharideportion (GBPP) were used to evaluate their activities on human HCT-116 and HT-29 CRC cell proliferation. Interleukin-8 secretion analysis was performed on HT-29 cells. Naive CD4 cell isolation and T-helper celldifferentiation were performed and determined using flow cytometry for Th1 and Treg in addition to cellcycle and apoptotic investigation. Results: GBPE and GBPP significantly inhibited interleukin-8 secretion and cancer cell proliferation,inhibited CD4þIFN-gþ cell (Th1) differentiation, and decreased CD4þFoxP3þ cell (Treg) differentiation. Compared to the GBPE, GBPP showed more potent antiinflammatory activities on the malignant cells. This is consistent with the observation that GBPP can also inhibit Th1-cell differentiation better, suggestingthat it has an important role in antiinflammation, whereas Treg cells hinder the body’s immuneresponse against malignancies. Supported by cell cycle and apoptosis data, GBPE and GBPP, at variousdegrees, remarkably enhanced the anticancer activities of 5-fluorouracil. Conclusion: Data from this project suggested that Asian ginseng berry potentially has clinical utility inmanaging enteric inflammation and suppressing CRC through immunomodulation mechanisms.