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Generalized passivity-based chaos synchronization

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Applied Mathematics and Mechanics(English Edition) 2010年第8期31卷 1009-1018页

作者： C.K.ahn Faculty of the Division of Electronics and Control Engineering Wonkwang University

In this paper, a new passivity-based synchronization method for a general class of chaotic systems is proposed. Based on the Lyapunov theory and the linear matrix inequality （LMI） approach, the passivity-based controller is presented to make the synchronization error system not only passive but also asymptotically stable. The proposed controller can be obtained by solving a convex optimization problem represented by the LMI. Simulation studies for the Genesio-Tesi chaotic system and the Qi chaotic system are presented to demonstrate the effectiveness of the proposed scheme.

关键词： passivity-based synchronization linear matrix inequality (LMI) chaotic systems Lyapunov theory

Bacteriophage cocktail supplementation improves growth performance,gut microbiome and production traits in broiler chickens

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Journal of Animal Science and Biotechnology 2021年第4期12卷 1339-1350页

作者： Santi Devi Upadhaya Je Min ahn Jae Hyoung Cho Jin Young Kim Dae kyung Kang sung Woo Kim Hyeun Bum Kim In Ho Kim Department of Animal Resource and Science Dankook UniversityNo.29 AnseodongCheonanChoongnam 31116South Korea Department of Animal Science North Carolina State University116 Polk HallBox 7621120 W Broughton DrRaleighNC 27695USA

Background:Effective antibiotic alternatives are urgently needed in the poultry industry to control disease *** therapy mainly utilizes lytic phages to kill their respective bacterial hosts and can be an attractive solution to combating the emergence of antibiotic resistance in ***:Five hundred and four,one-day-old broilers(Ross 308)were allotted to 1 of 4 treatment groups in a completely randomized *** consisted of CON(basal diet),PC(CON+0.025%Avilamax®),BP 0.05(CON+0.05%bacteriophage),and BP 0.10(CON+0.10%bacteriophage).Results:A significant linear effect on body weight gain(BWG)was observed during days 1–7,days 22–35,and cumulatively in bacteriophage(BP)supplemented *** BWG tended to be higher(P=0.08)and the feed intake(FI)was increased(P=0.017)in the PC group over CON group.A greater(P=0.016)BWG and trends in increased FI(P=0.06)were observed in the experiment in birds fed PC than CON *** the genus level,the relative abundance of Lactobacillus was decreased in PC(65.28%),while it was similar in BP 0.05 and BP 0.10(90.65%,86.72%)compared to CON(90.19%).At the species level,the relative abundance of Lactobacillus salivarus was higher in BP 0.05(40.15%)and BP 0.10(38.58%)compared to the CON(20.04%)and PC(18.05%).A linear reduction in the weight of bursa of Fabricius(P=0.022)and spleen(P=0.052)was observed in birds fed graded level of BP and an increase(P=0.059)in the weight of gizzard was observed in birds fed PC over BP *** and quadratic responses were observed in redness of breast muscle color in birds fed graded level of ***:The inclusion of the 0.05%and 0.1%BP cocktail linearly improved broiler weight during the first 7 days,22–35 days and cumulatively,whereas 0.05%BP addition was sufficient for supporting immune organs,bursa and spleen as well as enhancing gut microbiome,indicating the efficacy of 0.05%BP as a substitute antibiotic growth promoter in broiler diets.

关键词： Bacteriophage Broiler chickens Gut microbiome Performance

Recent advances in nanomaterials for high-performance Li–S batteries

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Journal of Energy Chemistry 2020年第8期29卷 86-106,I0004页

作者： James E.Knoop Seongki ahn Joint School of Nanoscience and Nanoengineering North Carolina Agricultural and Technical State UniversityGreensboroNC 27401USA Research Organization for Nano and Life Innovation Waseda University513WasedatsurumakichoShinjuku-kuTokyo 162-0041Japan

This article reviews nanotechnology as a practical solution for improving lithium-sulfur batteries. Lithiumsulfur batteries have been widely examined because sulfur has many advantageous properties such as a high crustal abundance, low environmental impact, low cost, high gravimetric(2600 W h kg-1) and volumetric(2800 W h L-1) energy densities, assuming complete conversion of sulfur to lithium sulfide(Li2S)upon lithiation. However, lithium-sulfur batteries have not yet reach commercialization due to demerits involving the formation of soluble lithium polysulfides(Li2Sn, n=3–8), low electrical conductivity, and low loading density of sulfur. These issues arise mainly due to the polysulfide shuttle phenomenon and the inherent insulating nature of sulfur. To overcome these issues, strategies have been pursued using nanotechnology applied to porous carbon nanocomposites, hollow one-dimensional carbon nanomaterials, graphene nanocomposites, and three-dimensional carbon nanostructured matrices. This paper aims to review various solutions pertaining to the role of nanotechnology in synthesizing nanoscale and nanostructured materials for advanced and high-performance lithium–sulfur batteries. Furthermore, we highlight perspective research directions for commercialization of lithium–sulfur batteries as a major power source for electric vehicles and large-scale electric energy storage.

关键词： Nanotechnology Lithium–sulfur batteries Carbon nanomaterials Nanocomposite sulfur 3D nanostructured materials

Curative resection of leiomyosarcoma of the descending colon with metachronous liver metastasis: A case report

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World Journal of Gastrointestinal Surgery 2023年第5期15卷 992-999页

作者： Soo-Hyeon Lee Sang-Ho Bae Sang-Cheol Lee Tae-sung ahn Zisun Kim Hae-Il Jung Department of Surgery Soonchunhyang University Cheonan HospitalCheonan 31151ChungnamSouth Korea Department of Internal Medicine Soonchunhyang University Cheonan HospitalCheonan 31151ChungnamSouth Korea Department of Surgery Soonchunhyang University Bucheon HospitalBucheon 14584GyeonggiSouth Korea

BACKGROUND Leiomyosarcoma(LMS)has a poor prognosis and rarely originates from the *** resection is possible,surgery is the first treatment most commonly ***,no standard treatment exists for hepatic metastasis of LMS;although,several treatments,such as chemotherapy,radiotherapy,and surgery,have been ***,the management of liver metastases remains *** SUMMARY We present a rare case of metachronous liver metastasis in a patient with LMS originating from the descending colon.A 38-year-old man initially reported abdominal pain and diarrhea over the previous two *** revealed a 4-cm diameter mass in the descending colon,40 cm from the anal *** tomography revealed intussusception of the descending colon due to the 4-cm *** patient underwent a left *** analysis of the tumor revealed that it was positive for smooth muscle actin and desmin,and negative for cluster of differentiation 34(CD34),CD117,and discovered on gastrointestinal stromal tumor(GIST)-1,which are characteristic of gastrointestinal LMS.A single liver metastasis developed 11 mo postoperatively;the patient subsequently underwent curative resection *** patient remained disease-free after six cycles of adjuvant chemotherapy(doxorubicin and ifosfamide),and 40 and 52 mo after liver resection and primary surgery,*** cases were obtained from a search of Embase,PubMed,MEDLINE,and Google *** Early diagnosis and surgical resection may be the only potential curative options for liver metastasis of gastrointestinal LMS.

关键词： Leiomyosarcoma Colon Liver metastasis Surgical resection Treatment Case report

H∞ stability conditions for delayed neural networks with external disturbances and norm-bounded uncertainties:Delay independent and dependent criteria

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Science China(Information Sciences) 2011年第8期54卷 1691-1701页

作者： Choon Ki ahn Department of Automotive Engineering Seoul National University of Science & Technology

In this paper,we propose new delay independent and dependent H ∞ stability conditions for delayed neural networks with external disturbances and norm-bounded *** conditions are presented to not only guarantee the asymptotical stability but also reduce the effect of external disturbance to an Hnorm constraint. The proposed conditions are represented by linear matrix inequalities （LMIs）.Optimal Hnorm bounds are obtained easily by solving convex problems in terms of *** applicability of these conditions is illustrated by numerical examples.

关键词： H_∞ analysis delayed neural networks uncertainty disturbance linear matrix inequality (LMI)

Anti-inflammatory effects of natural volatile organic compounds from Pinus koraiensis and Larix kaempferi in mouse model

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The Journal of Biomedical Research 2019年第5期33卷 343-350页

作者： Changhwan ahn Jae-Woo Kim Mi-Jin Park Seung Ryul Kim sung-Suk Lee Eui-Bae Jeung Laboratory of Veterinary Biochemistry and Molecular Biology Veterinary Medical Center and College of Veterinary MedicineChungbuk National UniversityCheongjuChungbuk 28644Republic of Korea Division of Wood Chemistry&Microbiology Department of Forest ProductsNational Institute of Forest ScienceSeoul 02455Republic of Korea Laboratory of Biochemistry School of MedicineChungbuk National UniversityCheongjuChungbuk 28644Republic of Korea.

Natural volatile organic compounds(VOCs) extracted from conifers such as P. koraiensis and L. kaempferi have long been studied for their anti-oxidant, anti-proliferative, and anti-inflammatory effects. To evaluate the anti-inflammatory effects of VOCs from P. koraiensis and L. kaempferi, lipopolysaccharide(LPS) was administered to generate a mouse model for inflammation by the nasal route to the lungs and intraperitoneally to the whole body. VOCs of P. koraiensis and L. kaempferi were exposed to the mice by standardized wood panels with closed system. Increased levels of serum IgE and PGE2 were observed after exposure to dexamethasone and VOCs. We further determined the expression levels of inflammatory cytokine mRNA in the LPS-induced inflammation model by the reverse transcription quantitative polymerase chain reaction. Furthermore, the levels of cyclooxygenase-2, tumor necrosis factor-α, interleukin-1β, and interleukin-13 were determined in peripheral blood mononuclear cells. Those inflammatory cytokines and the key enzyme for inflammation cyclooxygenase-2 expression in PBMCs were strongly reversed by dexamethasone and VOCs. Lung tissues after nasal LPS exposure showed increased cytokine mRNA expressions which were suppressed by treatment with dexamethasone and VOCs. Furthermore, the damage induced by LPS was attenuated by dexamethasone and VOCs. In conclusion, the results from the present study indicate that VOCs of P. koraiensis and L. kaempferi have a therapeutic potential in the treatment or prevention of local and systemic inflammation due to their immunosuppressive effects.

关键词： Pinus koraiensis Larix kaempferi inflammation cytokine lungs

Influence of process parameters on drilling characteristics of Al 1050 sheet with thickness of 0.2 mm using pulsed Nd:YAG laser

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中国有色金属学会会刊：英文版 2009年第B9期19卷 157-163页

作者： Dong-Gyu ahn Gwang-Won JUNG Department of Mechanical Engineering Chosun University

The object of this work is to investigate the influence of process parameters on drilling characteristics of an Al 1050 sheet with a thickness of 0.2 mm using a pulsed Nd:YAG laser through numerical analyses and experiments. By comparing the numerical analyses with the experiments, a proper numerical model was obtained. From the results of the numerical analyses and the experiments, the effects of process parameters on entrance diameters of drilled holes, shapes of the holes, taper angles of the holes and temperature distributions in the vicinity of the holes were examined quantitatively. In addition, the optimal drilling condition was estimated to improve the quality of the drilled holes.

关键词： YAG激光器工艺参数 Nd 脉冲井用厚度色基数值分析

Influence of cutting parameters on surface characteristics of cut section in cutting of Inconel 718 sheet using CW Nd:YAG laser

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中国有色金属学会会刊：英文版 2009年第B9期19卷 32-39页

作者： Dong-Gyu ahn kyung-Won BYUN Department of Mechanical Engineering Chosun University

Recently, laser cutting technologies begin to use for manufacturing mechanical parts of Inconel super-alloy sheet due to difficulties of machining of the Inconel material as a results of its extremely tough nature. The objective of this work is to investigate the influence of cutting parameters on surface characteristics of the cut section in the cutting of Inconel 718 super-alloy sheet using CW Nd:YAG laser through laser cutting experiments. Normal cutting experiments were performed using a laser cutting system with six-axis controlled automatic robot and auto-tracking system of the focal distance. From the results of the experiments, the effects of the cutting parameters on the surface roughness, the striation formation and the microstructure of the cut section were examined. In addition, an optimal cutting condition, at which the surface roughness is minimized and both the delayed cutting phenomenon and the micro-cracking are not initiated, is estimated to improve both the part quality and the cutting efficiency.

关键词：激光切割技术 Inconel YAG激光器表面特性 Nd 表面粗糙度分切自动跟踪系统

Effect of Ni and Mn on the Mechanical Properties of 22Cr Microduplex Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2015年第1期28卷 32-38页

作者： Jun-Young Park Yong-Sik ahn Department of Materials Science and Engineering Pukyong National University

The tensile properties of 22Cr–2Ni–4Mn–0.2N micro-duplex stainless steels with different Ni and Mn contents were investigated. Duplex stainless steels were vacuum induction melted and hot rolled, then annealed at 1,000–1,100 °C, at which temperature both the austenite and ferrite phases were stable. The volume fraction of the ferrite phase was markedly affected by the alloying elements of Mn and Ni; 1 wt% of Mn was equivalent to 0.4 wt% of Ni. All of the steels tested at room temperature showed the common strain-hardening behavior, while the steels tested at lower temperatures（-30 or-50 °C）showed a distinct inflection point in their stress–strain curves, which resulted from the transformation of the austenite to straininduced martensite. The onset strain（e0） of the inflection point in the stress–strain curve depended on the Md30 value of the steel. Testing at lower temperatures resulted in smaller e0 and consequently higher strengths and fracture strains（ef）. The tensile behavior was examined from the perspective of austenite stability of the micro-duplex stainless steels with the different Ni and Mn contents.

关键词： Duplex stainless steel Microstructure Mechanical property Alloy composition