Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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Now showing 1 - 10 of 30
  • Conference Object
    Citation - Scopus: 1
    Enterprise Systems Applications Development Plans To Build and Develop Robust and Environmentally Sensitive Green Logistics Systems Management Software
    (Springer Verlag, 2009) Yıldız, Türkay; Yercan, Funda
    Within the concept of enterprise-wide development of environmentally sensitive systems' application modules to fully integrate all-in-one green logistics services principles have received much attention and consideration from practitioners, academia, and from the industry, for about more than a decade. However, by taking into the consideration of the multidisciplinary nature of the issue, large scale effective collaborative framework is needed to be developed. Therefore, utilization of UML diagrams, class definitions, defining class relationships, fields, tables, views, etc. so on play crucial roles in the design phases of the enterprise system. Thus, this article largely deals with the major logistics work processes and their interactions within the consideration of environmental engineering issues on business operations to address step-by-step process control mechanisms to provide necessary input to build robust-design and better implementation of the needed IT software backbone.
  • Conference Object
    Citation - WoS: 2
    Citation - Scopus: 2
    Function Generation Synthesis of Planar Slider-Crank Linkages for Given 3 Positions and a Dead-Center Position
    (Springer Verlag, 2020) Kiper, Gokhan; Gorgulu, Ibrahimcan; Kucukoglu, Sefa Furkan
    Function generation for finitely many positions and dead-center design problems are generally separately handled in the literature. This paper presents a mixed formulation for planar slider-crank linkages where three precision points and a folded or extended dead-center position are to be satisfied. The formulation results in an 8th degree univariate. Examples show that generally there are four real solutions, only two of which result in distinct solutions.
  • Conference Object
    Citation - WoS: 1
    Development of a Proper Mix-Design for Impact Loading of Deflection Hardening Hybrid Fiber Reinforced Concrete
    (Springer Verlag, 2018) Alami, Muhammad Musa; Erdem, Tahir Kemal; Yardımcı, Mert Yücel; Aydın, Serdar
    This study aims to develop a low-cost Hybrid Fiber Reinforced Concrete (HyFRC) that exhibits deflection hardening behavior under bending and has high energy absorption capacity under impact loading by determining proper combination of steel and polyvinyl alcohol (PVA) fibers. More than forty mixtures were prepared including two mixtures of conventional concrete, six mixtures of Engineered Cementitious Composites (ECC), and thirty-six mixtures of HyFRC. The design parameters were chosen as fly ash to cement ratio (1.2, 1.7 and 2.2), steel fiber type and amount (0.5%, 0.75%, and 1.25% by volume), PVA fiber amount (0.25% and 0.50% by volume), and maximum aggregate size (Dmax) of 8 mm and 16 mm. Several tests were carried out on fresh and hardened specimens such as bending, compression, and low-velocity flexural impact loading. Based on the results, it is found that the mixture with 0.75% steel fiber and 0.25% PVA showed the best performance for the aim of the study.
  • Conference Object
    Kinematic Synthesis of Planar 4-Bar Path Generators for Finite Line Positions
    (Springer Verlag, 2019) Kiper, Gökhan; Söylemez, Eres
    Although the kinematic synthesis of planar function, point-path and motion gen-erators are vastly studied in the literature, surprisingly synthesis of line-path gen-erators is not formulized in detail. This study presents the formulization of the planar 4-bar line-path generator synthesis problem for up to 5 homologous posi-tions. Numerical examples for 3 and 4 line positions are presented for the illustra-tion of the formulations.
  • Conference Object
    Citation - Scopus: 4
    Static Force Balancing of a 2r1t Parallel Manipulator With Remote Center of Motion
    (Springer Verlag, 2019) Yaşır, Abdullah; Kiper, Gökhan; Dede, Mehmet İsmet Can; Van der Wijk, Volkert
    Assistive robots in surgical applications should be gravity balanced due to safety considerations. This study presents a gravity balancing solution for a 3-degree-of-freedom parallel manipulator to be used as an endoscope navigation robot for transnasal minimal invasive surgery applications. The manipulator has a rather simple structure that allows individual balancing of the three legs in their respec-tive planes of motion. First, sole counter-mass balancing is investigated, but it is seen that the extra mass amount is too much. Sole spring balancing is not consid-ered as an option due to constructional complexity. A hybrid solution as a combi-nation of counter-mass and spring balancing is devised. In the proposed solution, the masses on the distal links of a leg are balanced with counter-masses so that all masses are lumped to the link connected to the base of the manipulator. Hence the problem is simplified into the balancing of a pendulum. The necessary formula-tions are derived and numerical calculations demonstrate that the hybrid balancing yields a feasible solution.
  • Conference Object
    Citation - Scopus: 2
    Fault-Tolerance Experiments With a Kinematically Redundant Holonomic Mobile Robot
    (Springer Verlag, 2018) Şahin, Osman Nuri; Çelik, Onur; Dede, Mehmet İsmet Can
    Indoor locomotion with mobile robots has found applications in industrial part moving, factory floor investigation and cleaning tasks. Holonomic mobile robots have the advantage of moving in tight and winding passages without the need of steering. In this study, a four omni-directional wheeled mobile robot is considered. The mobile robot is kinematically redundant having four of these wheels and this is used in providing fault-tolerance due to a malfunction in one of the wheels. In this paper, the redundancy resolution for this mobile robot is explained providing a solution to a fault in one of the wheels during operation. A top level controller to compensate for the orientation errors is introduced. Finally experimental set-up is presented along with the result of the fault-tolerance experiments.
  • Conference Object
    Kinematic Analysis Validation and Calibration of a Haptic Interface
    (Springer Verlag, 2014) Dede, Mehmet İsmet Can; Taner, Barış; Bilgincan, Tunç; Ceccarelli, Marco
    Initial calibration tests of a novel hybrid-structured kinesthetic haptic device based on an R-CUBE mechanism is presented in this paper. Experimental validation of the kinematics along with the experimental test set-up description is provided for the manufactured R-CUBE mechanism.
  • Article
    Citation - WoS: 4
    Citation - Scopus: 5
    Generating Ontologies From Relational Data With Fuzzy-Syllogistic Reasoning
    (Springer Verlag, 2015) Kumova, Bora İsmail
    Existing standards for crisp description logics facilitate information exchange between systems that reason with crisp ontologies. Applications with probabilistic or possibilistic extensions of ontologies and reasoners promise to capture more information, because they can deal with more uncertainties or vagueness of information. However, since there are no standards for either extension, information exchange between such applications is not generic. Fuzzy-syllogistic reasoning with the fuzzy-syllogistic system4S provides 2048 possible fuzzy inference schema for every possible triple concept relationship of an ontology. Since the inference schema are the result of all possible set-theoretic relationships between three sets with three out of 8 possible fuzzy-quantifiers, the whole set of 2048 possible fuzzy inferences can be used as one generic fuzzy reasoner for quantified ontologies. In that sense, a fuzzy syllogistic reasoner can be employed as a generic reasoner that combines possibilistic inferencing with probabilistic ontologies, thus facilitating knowledge exchange between ontology applications of different domains as well as information fusion over them.
  • Book Part
    Citation - Scopus: 1
    Hybrid Control of a 3-D Structure by Using Semi-Active Dampers
    (Springer Verlag, 2014) Turan, Gürsoy
    A base isolated three storey 3-D building is semi-actively controlled not to exceed the maximum allowable base displacement. Large displacements are likely to cause failure in the isolation system, and hence, failure in the superstructure is expected. If a base isolated structure is positioned next to a very long fault line, such as the North Anatolian Fault, the structure will mostly undergo far field type excitations. Near field effects will be seen less occasionally, but design considerations should be made to account for both types of excitations. In case of nearby seismic action, the isolated building should be smart enough to modify its isolation impedance to resist against large ground displacement and velocities. For this study, an isolated three storey building model together with four dampers, which are all placed at the base level, is considered. The dampers have controllable orifices (damping coefficients) and the magnitudes of these damping coefficients are assigned by using a linear quadratic regulator (LQR). During an earthquake excitation, the storey displacements and velocities are used as feedback in the calculation of the optimal control force that is producible by viscous dampers, at each time step. This force, however, is applied only at times when critical displacements and/or velocities occur. The performance of the set of controllers is presented via time simulations of the system for three recorded earthquakes. In addition, these records are time shifted five folds to see the effect of near field action. The results indicate that the control effectively reduces the maximum displacements of the isolation system, while maintaining a reasonable isolation to the superstructure.
  • Conference Object
    Citation - Scopus: 11
    Structural Synthesis of 2r1t Type Mechanisms for Minimally Invasive Surgery Applications
    (Springer Verlag, 2018) Yaşır, Abdullah; Kiper, Gökhan
    Assistive and operative manipulators allow easier and more precise operations for minimally invasive surgery. Such manipulators often have a pivot point at the incision port on the pa-tient’s body, so the manipulator should have a remote center of motion. This study presents the structural synthesis of a non-parasitic 3-dof manipulator with 2R1T motion pattern to be used as a remote center of motion mechanism for minimally invasive surgery applications. The manipulators of various kinematic structure are evaluated considering criteria such as possibility of construction of the mechanism for remote center of motion, ease of dynamic balancing, number of links, structural symmetry, the number of actuators connected to the base and decoupling of the joint inputs and the output motion of the platform.