Control of Rigid Robots Equipped with Brushed DC-Motors as Actuators

Victor M. Hernandez-Guzman,Victor Santibanez,Gilberto Herrera 제어로봇시스템학회 2007 International Journal of Control, Automation, and Vol.5 No.6

Effects of Surface Properties of Bacterial Poly(3-hydroxybutyrate-co-3- hydroxyvalerate) on Adhesion and Proliferation of Mouse Fibroblasts

Victor N. Vasilets,박기동,Valentina A. Surguchenko,Anna S. Ponomareva,Eugene A. Nemetz,Victor I. Sevastianov,배진우 한국고분자학회 2015 Macromolecular Research Vol.23 No.2

Adhesion and proliferation of NIH/3Т3 mouse fibroblasts on the surfaces of bacterial copolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and its mixture with poly(ethylene glycol) with differing crystallinity, surfaceenergy, and mean roughness was investigated. The surface mean roughness of all films on both sides, at the air interfaceand at the glass interface, measured by atomic force microscopy, was higher (from 17.0±1.4 nm to 290.8±7.0 nm)than that of the tissue culture polystyrene control (9.5±0.6 nm). The structure, surface energy, and chemical compositionof bacterial films were studied by differential scanning calorimetry, contact angle measurements, and Fouriertransform infrared (FTIR) spectroscopy. After 48 h, cell proliferation on all surfaces was significantly less than onthe control substrate; however, after 72 and 96 h, cell proliferation was comparable with control on some surfaceswith sufficient roughness. Addition of poly(ethylene glycol) resulted in an increase of adhesion and the metabolicactivity of the cells, even for relatively smooth surfaces. The complex correlation of cell metabolic activity with surfaceenergy and crystallinity for “rough” (mean roughness >100 nm) and “smooth” (mean roughness < 100 nm) surfacesis discussed.

Characteristics of relativistic electron mirrors generated by an ultrashort nonadiabatic laser pulse from a nanofilm.

Kulagin, Victor V,Cherepenin, Vladimir A,Gulyaev, Yuri V,Kornienko, Vladimir N,Pae, Ki Hong,Valuev, Victor V,Lee, Jongmin,Suk, Hyyong Published by the American Physical Society through 2009 Physical review. E, Statistical, nonlinear, and so Vol.80 No.1

<P>For controllable generation of an isolated attosecond relativistic electron bunch [relativistic electron mirror (REM)] with nearly solid-state density, we proposed [V. V. Kulagin, Phys. Rev. Lett. 99, 124801 (2007)] to use a solid nanofilm illuminated normally by an ultraintense femtosecond laser pulse having a sharp rising edge (nonadiabatic laser pulse). In this paper, the REM characteristics are investigated in a regular way for a wide range of parameters. With the help of two-dimensional (2D) particle-in-cell (PIC) simulations, it is shown that, in spite of Coulomb forces, all of the electrons in the laser spot can be synchronously accelerated to ultrarelativistic velocities by the first half-cycle of the field, which has large enough amplitude. For the process of the REM generation, we also verify a self-consistent one-dimensional theory, which we developed earlier (cited above) and which takes into account Coulomb forces, radiation of the electrons, and laser amplitude depletion. This theory shows a good agreement with the results of the 2D PIC simulations. Finally, the scaling of the REM dynamical parameters with the field amplitude and the nanofilm thickness is analyzed.</P>

‘Iru’ Fermented with Latobacillus plantarum Significantly Reduced Cardiovascular Risks in Hypercholesterolaemic Rats

Ayowole Victor Atere,Victor Olusegun Oyetayo,Felix Akinsola Akinyosoye 한국식품보건융합학회 2022 식품보건융합연구 (KJFHC) Vol.8 No.6

Hypercholesterolaemia is one of the risk factors of coronary health in humans; hence this research was to investigate the effect of Parkia biglobosa seeds fermented with Lactobacillus plantarum on the cardiac risk factors of diet-induced hypercholesterolaemic Wistar rats. Hypercholesterolaemia in rats were experimentally induced and the hypercholesterolaemic Wistar rats were treated with iru samples. The total cholesterol, triglyceride, high density lipoprotein (HDL), low density lipoprotein (LDL), liver biomarkers and cardiac risks factors were determined after inducement and treatment with iru. Fourteen (14)-days after inducement, the rats in the group induced had the highest weight of 112.40 g while the control group had 94.30 g. The total cholesterol (TC) in the induced group was 100.80 mg/dl while the control had 51.40 mg/dl, triglyceride (TG) in the induced group was 111.75 mg/dl while the control group had 68.45 mg/dl. After 28 days of treatment, the group treated with fermented samples showed a reduction in the TC (100.80 to 56.99 mg/dl), Triglyceride (111.75 to 32.53 mg/dl), LDL (49.48 to 6.65 mg/dl), cardiac risk ratio (3.36 to 1.28), atherogenic coefficient (3.13-0.29) and atherogenic index (0.57 to 0.11). The result from this study reveals that fermented Parkia biglobosa sample reduced the cardiac risk of rats significantly.

Local Condiment, Iru, Obtained from the Fermentation of Parkia biglobosa Seed Substantially Reduced the Serum Cholesterol Level of Wister Rats

Ayowole Victor Atere,Ayodeji Adedeji,Afolabi Clement Akinmoladun,Victor Olusegun Oyetayo,Felix Akinsola Akinyosoye 한국식품영양과학회 2020 Preventive Nutrition and Food Science Vol.25 No.2

Hypercholesterolaemia is one of the risk factors in coronary heart disease. Hence, this research was designed to investigate the effect of iru on cholesterol levels in hypercholesterolaemic rats. The fermented condiment iru was produced naturally and with starter cultures of Lactobacillus plantarum, Bacillus subtilis, and Leuconostoc sp.. The hypercholesterolaemic rats were fed a diet supplemented with iru for 28 days, and total cholesterol, triglyceride (TG), high density lipoproteins (HDL), and low density lipoproteins (LDL) were determined before and after feeding. Cholesterol levels in hypercholesterolaemic rats (100.80 mg/dL) were reduced to 56.99∼80.21 ㎎/dL after feeding with iru supplementation while rats not placed on the iru diet had cholesterol levels of 119 ㎎/dL. There were also significant reductions (P<0.05) in serum TG (78.77∼32.57 ㎎/dL) and LDL (28.43∼6.63 ㎎/dL) levels in rats fed the iru diet compared with the control (63.36 ㎎/dL). Higher and significantly different (P<0.05) HDL was found in rats fed with iru fermented with L. plantarum (44.01 ㎎/dL) while the least was found in the untreated group (28.93 ㎎/dL). The results from this study suggest that supplementing the diet with iru obtained by the fermentation of Parkia biglobosa seeds may significantly reduce cholesterol level in the blood stream.

'Iru' Fermented with Latobacillus plantarum Significantly Reduced Cardiovascular Risks in Hypercholesterolaemic Rats

ATERE, Ayowole Victor,OYETAYO, Victor Olusegun,AKINYOSOYE, Felix Akinsola Korea FoodHealth Convergence Association 2022 융합경영연구 Vol.8 No.6

Hypercholesterolaemia is one of the risk factors of coronary health in humans; hence this research was to investigate the effect of Parkia biglobosa seeds fermented with Lactobacillus plantarum on the cardiac risk factors of diet-induced hypercholesterolaemic Wistar rats. Hypercholesterolaemia in rats were experimentally induced and the hypercholesterolaemic Wistar rats were treated with iru samples. The total cholesterol, triglyceride, high density lipoprotein (HDL), low density lipoprotein (LDL), liver biomarkers and cardiac risks factors were determined after inducement and treatment with iru. Fourteen (14)-days after inducement, the rats in the group induced had the highest weight of 112.40 g while the control group had 94.30 g. The total cholesterol (TC) in the induced group was 100.80 mg/dl while the control had 51.40 mg/dl, triglyceride (TG) in the induced group was 111.75 mg/dl while the control group had 68.45 mg/dl. After 28 days of treatment, the group treated with fermented samples showed a reduction in the TC (100.80 to 56.99 mg/dl), Triglyceride (111.75 to 32.53 mg/dl), LDL (49.48 to 6.65 mg/dl), cardiac risk ratio (3.36 to 1.28), atherogenic coefficient (3.13-0.29) and atherogenic index (0.57 to 0.11). The result from this study reveals that fermented Parkia biglobosa sample reduced the cardiac risk of rats significantly.

Challenges of Implementing Container Terminal Operating System: The Case of the Port of Mombasa from the Belt and Road Initiative (BRI) Perspective

Victor Oyaro Gekara,Xuan-Vi Thanh Nguyen 인하대학교 정석물류통상연구원 2020 JOURNAL OF INTERNATIONAL LOGISTICS AND TRADE Vol.18 No.1

This paper examines the port of Mombasa’s attempted implementation of computer-based terminal operating systems (TOS); the challenges faced and the outcomes. In addition to enhancing its operations efficiency, a key motivation for the technology was to facilitate better integration and connectivity to the Belt and Road as a key gateway along the key route. It utilised a qualitative single-case methodology, involving a combination of semi-structured interviews, non-participant observations and content analysis of relevant policy documents and reports provided by the port. The paper finds that the attempt to adopt and implement TOS at the port mostly failed as a result of a complex combination of technological, organisational and environmental factors. Most importantly, the wider business environment was ill equipped with the necessary information communication technology (ICT) infrastructure to support effective implementation. There was also a general lack of appropriately skilled workers to support and drive the same.

What Drives Korea-Japan Security Relations?

( Victor D Cha ) 한국국방연구원 1998 The Korean Journal of Defense Analysis Vol.10 No.2

One of the most critical yet understudied security relationships in East Asia is that between the Republic of Korea and Japan. The problem faced by the United States throughout the Cold War was how to manage the volatile relations between these two allies, which by all objective standards looked ripe for cooperation-the two states shared common friends and enemies, trade complementarities and burgeoning economic opportunities, all tethered together at the top by a plethora of domesticelite personal relationships. Three reasons have been offered over the years for the absence of good relations in spite of these forces for cooperation: economic competition, historical antagonism, and uncompromising political leadership in two "strong-state```` regimes. The common theme resonating from all these views for international relations theory was the inability of material, external structural variables (i.e. realism) to explain this relationship; and the need for political scientists and area specialists to employ unit-level analyses-in particular, variables of a cultural, ideational, and identity nature to truly grasp the relationship. This article seeks to avoid the "food fight" of competing research programs by arguing for a synthetic approach as the most responsible way of understanding the US-Korea-Japan triangle. I contend that the incidents of cooperation and friction in relations stem from the "nesting" of material factors in ideational ones. In other words, historical antagonism and enmity are clearly the established negative templates that inform the relationship between Japan and Korea, but at certain moments during the Cold War era, compelling material forces (in particular, shared concerns about the strength of US security commitments to the region) have propelled outcomes in a direction entirely different from these cultural biases. Moreover, I argue that should such material forces be sustained for some time, the cooperation that can emerge between Japan and Korea will not only be episodic and expedient but will be robust and permanent, reflecting a positive transformation of these negative cultural and ideational templates. The one event that has the potential of effecting such a change in the future is unification.

Damage assessment of structures - an US air force office of scientific research structural mechanics perspective

Victor Giurgiutiu 국제구조공학회 2010 Smart Structures and Systems, An International Jou Vol.6 No.2

This paper presents the perspective of the Structural Mechanics program of the Air Force Office of Scientific Research (AFOSR) on the damage assessment of structures for the period 2006-2009 when the author was serving as Program Manager at AFOSR. It is found that damage assessment of structures plays a very important role in assuring the safety and operational readiness of US Air Force fleet. The current fleet has many aging aircraft, which poses a considerable challenge for the operators and maintainers. The nondestructive evaluation technology is rather mature and able to detect damage with considerable reliability during the periodic maintenance inspections. The emerging structural health monitoring methodology has great potential, because it will use on-board damage detection sensors and systems, will be able to offer on-demand structural health bulletins. Considerable fundamental and applied research is still needed to enable the development, implementation, and dissemination of structural health monitoring technology.

Optimal area for rectangular isolated footings considering that contact surface works partially to compression

Victor Bonifacio Vela-Moreno,Arnulfo Luévanos-Rojas,Sandra López-Chavarría,Manuel Medina-Elizondo,Ricardo Sandoval-Rivas,Carmela Martínez-Aguilar 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.84 No.4

This paper presents a new model to obtain the minimum area of the contact surface for rectangular isolated footings, considering that the contact surface works partially to compression (a part of the contact surface of the footing is subjected to compression and the other is not in compression or tension). The methodology is developed by integration to obtain the axial load “P”, moment around the X axis “Mx” and moment around the Y axis “My”. This document presents the simplified and precise equations of the four possible cases of footing subjected to uniaxial bending and five possible cases of footing subjected to biaxial bending. The current model considers the contact area of the footing that works totally in compression, and other models consider the contact area that works partially under compression and these are developed by very complex iterative processes. Numerical examples are presented to obtain the minimum area of rectangular footings under an axial load and moments in two directions, and the results are compared with those of other authors. The results show that the new model presents smaller areas than the other authors presented.