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A Chaotic Ant Colony System for Path Planning of Mobile Robot
Xiaoming You,Kai Liu,Sheng Liu 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.1
Aiming at the path planning problem of mobile robot, a chaotic ant colony system was presented. The idea of the algorithm was that first generated chaotic sequences as the initial pheromone matrix and then ant colony traversed grids environment once, pheromone on the path was updated, as the completeness of the pheromone initialization. Pheromone update strategy adopt self-adaptive chaotic disturbance to avoid the search being trapped in local optimum. Grids environment simulated the robot workspace. Through the process of self-organization and chaos, the ant colony found the optimal path in the robot’s static environment. Simulation results show that chaotic ant colony system not only enhances the global search capability, but also more effective than the traditional ACS, moreover, it’s a novel approach to the robot path planning.
( Xiaoming Liu ),( Jae Min Shim ),( Zhuang Yao ),( Jae Yong Lee ),( Kang Wook Lee ),( Hyun Jin Kim ),( Kyung Sik Ham ),( Jeong Hwan Kim ) 한국미생물생명공학회(구 한국산업미생물학회) 2016 한국미생물·생명공학회지 Vol.44 No.1
청국장에서 강력한 항균력을 지닌 2개의 Bacillus 균주들인 CJW15와 SSD8이 분리되었다. 16S rRNA와 recA 유전자들 염기서열 결정에 의해 두가지 균주 모두 B. amyloliquefaciens로 동정되었다. CJW15는 B. cereus ATCC14579, Listeria monocytogenes ATCC19111, Lactococcus lactis ATCC11454 들의 증식을 강력히 억제하며 SSD8은 B. cereus ATCC14579와 Enterococcus faecium ATCC19953 증식을 억제하였다. 두 균주들의 항균력은 100oC, 15분 처리에도 감소하지 않았고 산성인 pH 3과 알칼리인pH 12에서도 안정하였다. 트립신, 펩신, 프로테아제 K, 프로테아제 효소처리에 의해 CJW15 항균력은 변화가 없었지만 SSD8 항균력은 절반으로 감소하였다. 두 균주 공히 surfactin, fengycin, iturin, iturinA와 같은 lipopeptide 생합성 유전자들을 지니고 있고 subtilin과 같은 박테리오신 유전자들도 지니고 있다. 또 두 균주들은 혈전용해능을 지니고 있다. Two Bacillus strains, CJW15 and SSD8, with strong antibacterial activities were isolated from cheonggukjang. Both were identified as B. amyloliquefaciens strains after gene sequencing of rRNA and recA. CJW15 strongly inhibited the growth of B. cereus (ATCC14579), Listeria monocytogenes (ATCC19111), and Lactococcus lactis (ATCC11454). In comparison, SSD8 inhibited the growth of B. cereus (ATCC14579) and Enterococcus faecium (ATCC19953). The antibacterial activities of the two strains were not affected when exposed to a temperature of 100°C for 15 min and were quite stable in acidic (pH 3) and alkaline (pH 12) pH conditions. Enzymatic treatments (trypsin, pepsin, proteinase K, and protease) had no effect on the activity of CJW15, but reduced the activity of SSD8 by half. Both isolates possess genes involved in the synthesis of lipopeptides (e.g. surfactin, fengycin, iturin, and iturin A), and genes encoding subtilin, a bacteriocin. Moreover, both isolates have fibrinolytic activities as well.
Applications of Bacterial Cellulose-Based Composite Materials in Hard Tissue Regenerative Medicine
Liu Yingyu,Liu Haiyan,Guo Susu,Qi Jin,Zhang Ran,Liu Xiaoming,Sun Lingxiang,Zong Mingrui,Cheng Huaiyi,Wu Xiuping,Shanxi Medical University School and Hospital of Stomatology 한국조직공학과 재생의학회 2023 조직공학과 재생의학 Vol.20 No.7
BACKGROUND: Cartilage, bone, and teeth, as the three primary hard tissues in the human body, have a significant application value in maintaining physical and mental health. Since the development of bacterial cellulose-based composite materials with excellent biomechanical strength and good biocompatibility, bacterial cellulose-based composites have been widely studied in hard tissue regenerative medicine. This paper provides an overview of the advantages of bacterial cellulose-based for hard tissue regeneration and reviews the recent progress in the preparation and research of bacterial cellulose-based composites in maxillofacial cartilage, dentistry, and bone. METHOD: A systematic review was performed by searching the PubMed and Web of Science databases using selected keywords and Medical Subject Headings search terms. RESULTS: Ideal hard tissue regenerative medicine materials should be biocompatible, biodegradable, non-toxic, easy to use, and not burdensome to the human body; In addition, they should have good plasticity and processability and can be prepared into materials of different shapes; In addition, it should have good biological activity, promoting cell proliferation and regeneration. Bacterial cellulose materials have corresponding advantages and disadvantages due to their inherent properties. However, after being combined with other materials (natural/ synthetic materials) to form composite materials, they basically meet the requirements of hard tissue regenerative medicine materials. We believe that it is worth being widely promoted in clinical applications in the future. CONCLUSION: Bacterial cellulose-based composites hold great promise for clinical applications in hard tissue engineering. However, there are still several challenges that need to be addressed. Further research is needed to incorporate multiple disciplines and advance biological tissue engineering techniques. By enhancing the adhesion of materials to osteoblasts, providing cell stress stimulation through materials, and introducing controlled release systems into matrix materials, the practical application of bacterial cellulose-based composites in clinical settings will become more feasible in the near future.
볏짚에서 분리한 Bacillus 균주들이 분비하는 항균물질들의 특성들
류샤오밍 ( Xiaoming Liu ),야오좡 ( Zhuang Yao ),심재민 ( Jae Min Shim ),이강욱 ( Kang Wook Lee ),김현진 ( Hyun-jin Kim ),김정환 ( Jeong Hwan Kim ) 한국미생물생명공학회(구 한국산업미생물학회) 2017 한국미생물·생명공학회지 Vol.45 No.2
볏짚으로부터 200 bacilli 균주들이 분리되었고 이중 3 균주는 Bacillus cereus ATCC1457를 강력히 저해하였다. 분자생물학적방법들을 사용하여 이들을 동정한 결과 RSC15는 B. licheniforms로 RSC26과 RSC42는 B. amyloliquefaciens들로 확인되었다. 항균물질들은 내열성을 지녀서 100℃ 20분 처리 후에도 활성의 절반이 유지되었다. 배양상등액의 SDS-PAGE 분석결과 2종의 다른 항세균물질들이 확인되었고 이들은 3.5 kDa 이하였다. 컬럼크로마토그래피 방법들을 사용하여 B. licheniformis RSC15가 만드는 항세균물질들을 부분정제한 결과 비활성은 955.0 AU/mg에서 6,400 AU/mg으로 증가하였다. Two hundred bacilli were isolated from rice straw, and 3 strains showing strong inhibitory activities against Bacillus cereus ATCC14579 were selected for further analyses. RSC15 was identified as B. licheni-forms, and RSC26 and RSC42 were identified as B. amyloliquefaciens by molecular identification methods. The inhibitory activities were heat stable, and half of the activity was retained for 20 min at 100℃. SDS-PAGE analyses of the culture supernatant indicated that 2 different kinds of antibacterial substances were present with sizes below 3.5 kDa. Antibacterial substances produced by B. licheniformis RSC15 were par-tially purified by column chromatography, and the specific activity increased from 955.0 AU/mg to 6,400 AU/mg.
Guoyi Liu,Yuanjun Liu,Xiaoming Zhao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.2
Considering sub-micron potassium titanate whiskers (BX-101), nanoscale potassium titanate whiskers (AX-301), sub-micron potassium titanate whiskers (AX-316) and high strength potassium titanate crystal (AX-319) as functional fillers, heat resistant ablative coated fabrics which have high radiant heat reflectivity were prepared. The effect of the type of functional fller on the thermal protection performance of heat resistant ablative coated fabrics was mainly discussed. Research showed that the microstructure of potassium titanate functional filler had a significant impact on the radiant heat reflectivity and thermal insulation performance of the prepared coated fabric. The coated fabric which took nanoscale potassium titanate whiskers (AX-301) with a minimum diameter and greater length-diameter ratio as functional filler has the highest thermal reflectivity and the best insulation property. Heat ray reflectivity of potassium titanate coated fabrics had positive correlation with their crystallinities. The higher the coated fabric crystallinity was, the greater the heat ray reflectivity. Thermogravimetric analysis results showed that after adding four kinds of potassium titanate fillers, the thermal stability of the prepared coated fabrics was enhanced, and the nanoscale potassium titanate whiskers (AX-301) coated fabrics had the best thermal stability.
Controlling oxygen vacancies and properties of ZnO
Xiaoming Li,Jizhong Song,Yanli Liu,Haibo Zeng 한국물리학회 2014 Current Applied Physics Vol.14 No.3
Intrinsic defects in semiconductors play crucial roles on their electrical and optical properties. In this article, we report on a facile method to control concentration of oxygen vacancies inside ZnO nanostructures and related physical properties based on adjustment of thermal transformation conditions from ZnO2 to ZnO, including annealing atmosphere and temperature. ZnO2 spheres assembled with nanoparticles were formed through the reaction between zinc nitrate and hydrogen peroxide. Significantly, it was found that the adopted temperature and atmosphere have remarkable impact on the concentration of oxygen vacancies, which was revealed by the variations of featured Raman scattering peaks at 584 cm1. Furthermore, with the increase of oxygen vacancies inside ZnO, the optical band-gap was found to red-shift 350 meV and the room-temperature ferromagnetism became stronger up to 1.6 emu/mg. The defect formation and evolution were discussed according to the chemical equilibrium of decomposition reaction under special local heating environment. This work demonstrated that ZnO2 decomposition is an effective process to control the defect states inside ZnO and related properties.