Interference intention classification of moving obstacles used for USV collision avoidance

Song Lifei,Sun Hao,Xu Kaikai,Huang Liang,Chen Houjing 대한조선학회 2022 International Journal of Naval Architecture and Oc Vol.14 No.1

Unmanned Surface Vessels (USV) may interfere with ships in the same lane during navigation and may be affected by ships that actively collide or intercept the USV. Evidently, the latter poses a greater threat than the former. This paper proposes the concept of active and inactive interference. It is necessary for the USV to accurately classify the vessels’ intentions to conduct a suitable collision avoidance strategy. However, the existing research on collision avoidance of USV focuses on avoiding moving obstacles and rarely considers the interference intention of dynamic obstacles for USV when choosing collision avoidance strategies. This paper proposes an algorithm to recognize the interference intention of ships by combining visual classification with a Support Vector Machine (SVM). First, a Convolutional Neural Network (CNN) is proposed to distinguish the merchant ship from a high-performance ship that actively interferes with the USV with high probability. A high-dimensional feature dataset was designed to illustrate the navigation characteristics of an obstacle, and Principal Component Analysis (PCA) was then employed to reduce the dimensionality of the dataset for obstacle classification. A modified SVM is presented to classify obstacles into active and inactive interference intention categories. Moreover, an escape algorithm based on an improved artificial potential field method is proposed for vessels with active interference. The simulation and experimental results clearly show that the USV can successfully identify the interference intention of obstacles and adopt a specific collision avoidance strategy for obstacles with active interference intentions. Using this algorithm, the USV can safely avoid obstacles with different interference intentions.

Ginseng berry polysaccharides on infl ammation-associated colon cancer: inhibiting T-cell differentiation, promoting apoptosis, and enhancing the effects of 5-fl uorouracil

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.

Ginseng berry polysaccharides on inflammation-associated colon cancer: inhibiting T-cell differentiation, promoting apoptosis, and enhancing the effects of 5-fluorouracil

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⁺IFN-γ⁺ cell (Th1) differentiation, and decreased CD4⁺FoxP3⁺ 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.

Automatic bearing diagnosis based on improved empirical wavelet decomposition and nonparametric test

Hongyan Jiang,Keqin Zhao,Lifei Chen,Dianjun Fang,Feng Cheng,Yong Chen 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.12

The 1/3-binary tree structure bandwidth is fixed, while the bands containing fault information sometimes do not fall equally in the fixed structure. To solve this problem, it is proposed to utilize the power spectrum to replace the Fourier spectrum, and to reconstruct the signal based on the scale space representation for the empirical wavelet decomposition. The fluctuation characteristics of the power spectrum frequency components and the energy distribution within frequency bands are taken full advantage of in this method. A new size parameter updating mechanism is employed to accelerate the signal reconstruction process. At the same time, it is thought that fault frequency is affected by the factor of slippage phenomena in order to realize a self-running diagnosis of bearing failure, and the occurring probability of the bearing fault is introduced to transform the envelope spectrum into a scalar indicator. As a result, without human intervention, the whole failure diagnosis process of the rolling bearing can be achieved by the manner of nonparametric testing. Simulation signal analysis results and experimental analysis results demonstrate the effectiveness and superiority of the proposed method.

중국 금화 지역의 일본군 위안소와 조선인 위안부-『김화계림회회칙급명부(金華鷄林會會則及名簿)』 분석-

소지량 ( Su Zhiliang ),진려비 ( Chen Lifei ) 인하대학교 한국학연구소 2018 한국학연구 Vol.0 No.49

The Jinhua municipal archives of Zhejiang Province has a Japanese version of the rules and list of Gyerim Organization in Jinhua. This dounment was written by Koreans’ townsmen association in April 1944, Which was discovered by Chinese intelligence personnel. The list of more than 200 persons, which contains information on the establishment of comfort women― the sex slavery system, in Jinhua area. Under literature research and investigation confirmed, the number of comfort stations are 11, and the owners of the comfort stations are 8 and the managers of the comfort station are 7 . The comfort women were 126. It accounts for 60% of the total number of koreans in Jinhua, and the youngest is only 17 years old. A total of 141 people were related to the comfort station. It accounting for 67.19% of the Gyerim Organization in Jinhua. The proportion is very impressive. This reflects the universality of the slave system by Japanese military in wartime. Therefore, this list is a valuable historical material reflecting Japanese aggressionandatrocities.

Preparation of Si3N4-based antimicrobial coatings from suspensions with long-time stability

Du Songmo,Zhang Jie,Sun Siyuan,Lifei Zhang,Chen Zhanglin,Zhang Shijia,Zhao Shuo,Tian Zhaobo,Ning Xiaoshan,Chen Kexin,Cui Wei,Liu Guanghua 한국세라믹학회 2024 한국세라믹학회지 Vol.61 No.3

A Si 3N4-based antimicrobial coating was fabricated from suspensions with long-time stability. The stability of Si 3N4 sus- pension and the antimicrobial performance of coating were investigated. The viscosity of Si 3N4 suspension was found to be the key factor aff ecting both stability and antimicrobial performance. The Si 3N4 suspensions were modifi ed with HASE acrylic copolymer, PAA-NH 4, and Polyurethane, resulting in an improvement of the stability of Si 3N4 suspension from a few hours to six months. The coating produced using the modifi ed Si 3N4 suspension exhibited an antibacterial activity of 99.9%. This study highlights the crucial role of modifying the Si 3N4 suspension in improving its long-term stability and coating antimicrobial activity.