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An analytical method is presented for the design of passive compliance appropriate to given assembly task. Use of passive compliance in mating operations is effective in order to prevent excessive contact forces and to guide a part to be assembled to its goal location despite of positioning errors. A method to design passive compliance is thus required. First, quasi-static equilibrium conditions are established based on the kinematic and quasi-static analyses of mechanical contacts which are earned as the result of analysis of assembly process. Second, the problem of solving desired compliance is formalized by an optimal one, in which the compliance is designed minimizing an object function subject to some conditions. Finally, one numerical example is shown to illustrate the proposed design method.
An analysis of plastic instability in multilayered cylindrical pressure vessels is performed with the slip between vessel layers fully considered. Previous studies on the maximum internal pressure of multilayered pressure vessels have conventionally assumed that the pressure vessel deforms continuously and axi-symmetrically, and have thus produced no different results from those of monolayered pressure vessels of the same size. In this study, a frictionless slip is assumed to exist between layers, which can cause a discontinuous deformation of the pressure vessel. The plastic instability analysis of multilayered cylindrical pressure vessels shows that the conventional method overestimates the maximum internal pressure in some cases. An intuitive and simple, novel algorithm is also presented for computing the maximum internal pressure and analyzing plastic instability of pressure vessels.
The silicon pendulum with a flexure hinge is designed and fabricated for the servo type accelerometer which is used in INS(Inertial Navigation System). For the INS application, it is essential to measure low-frequency acceleration with high accuracy. Therefore pendulum could be moved easily at small amount of input acceleration. For the purpose, the long type flexure is adapted. To prevent flexures from being buckled, the special arrangement of flexures is designed. And the paper also describes in detail the etching process for fabricating silicon pendulum assembly. The servo type accelerometer with above mentioned silicon pendulum assembly is developed and is carried out static test. The long flexure reduce its stiffness considerably so that a stiffness of 1.6139 N/m is acquired. Static test show a sensitivity threshold of 4.6×10 exp (-6) g and a maximum measurement range of ±24g. These test results shows that the accelerometer presented in this study can be adequately used in precision motion measurement application such as strapdown inertial navigation systems.
Nearest neighbor search is emerging as an important search paradigm in a variety of applications, usually involving similarity searching, in which objects are represented as vectors of d numeric feature. However, despite decades of efforts, except for the filtering approach such as the VA-file , the current solutions to find exact k nearest neighbors are far from satisfactory for large d. To overcome the dimensionality curse , the filtering approach represents vectors as compact approximations, and by first scanning these smaller approximations, only a small fraction of the real vectors are visited. The performance of the filtering approach depends largely on the filtering capability of the approximation. In this paper, we introduce the local polar coordinate file (LPC-file) based on the filtering approach for nearest-neighbor searches in high-dimensional image databases. The basic idea is to partition the vector space into hyper-rectangular cells and then to approximate vectors by polar coordinates on the partitioned local cells. The local polar coordinate information significantly enhances the discriminatory power of the approximation. To demonstrate the effectiveness of the LPC-file, we conducted extensive experiments and compared the performance with the VA-file and the sequential scan by using synthetic and real data sets. The experimental results demonstrate that the LPC-file outperforms significantly both of the VA-file and the sequential scan in total elapsed time and in the number of random disk accesses, and that the LPC-file is robust in both "good" distributions (such as random) and "bad" distributions(such as skewed and clustered).
We present a new framework for an autonomous distributed manufacturing system to improve the system efficiency as well as to cope flexibly with environmental change. When a customer order inputted, some alternatives for working group and their production schedules are made through autonomous decision making of the system constituents, and an optimal resources group is allocated through the bidding process based on a contract net protocol. In the proposed system, the concept of transition lots are introduced in order to cope with one to middle volume production and to improve the efficiency. Especially, for the purpose of the latter, an intermediate conceptual agent called process agent is created by a constituent who is willing with leadership to fulfill the bid order, organizes a working group, and manages the task execution, whereas these roles are played by a central computer in traditional distributed manufacturing systems. Every constituent makes decisions and actions so as to maximize its possessing value, and the overall behavior of the system is controlled by the value distribution.
Nowadays there are lots of researches on robot systems working on danger environments and being controlled remotely. In this paper, we describe a virtual robot interface system based on Internet for supporting more advanced and humanized interface. In the system, a worker can order scanning and moving objects to the other position in a 3D virtual interface environment at a clinet located remotely. Then the server detects a 3D profile data from the objects by using robot controlling and a range finder automatically and the robot moves the object to the new position in real space. The proposed interface system supports advanced virtual 3D interface and makes it possible one to manage the objects remotely more conveniently.
IMT-2000 is a third generation mobile telecommunication system, which aims to provide multimedia services under muti-environments and global roaming services over the world. The objective of this paper is to propose the design and implementation schemes of the service switching resource library function (SSRL) in the IMT-2000 MSC. To propose these schemes, we first introduce a SSF functional model architecture and interworking relationship between its functions. For design schemes, we second propose the structure of SSRL and it interface with other functions. Subsequently, we define the libraries and database for SSRL. Finally, we implement the SSRL functionality by the design of detail data structure of the libraries and database and by the SDL flow diagrams for operational algorithms of the SSRL.
It is said that Japanese and Korean grammar have many similar features. Using these similarities, we have developed direct translation method by which a deep level analysis of syntax and semantics between two languages can be omitted. Even in the direct translation for the very similar language pair, however there are still a lot of problems that have to be solved for high-quality translation. Out of them we only focus on the predicate translation, whose difficulty is caused not only by complex conjugation but also by the inconsistent syntactic category and the different relative order of modal expressions between two languages. To solve the problems, this paper propose a table-driven predicate generation in which a variable order modality-feature ordering and lexicalizing table(called VOMFOLT) plays an important role to map Japanese predicates into their Korean equivalents via abstract pivot of symbolic modality features.
We have investigated the fabrication of Si nanoparticle and C_60 thin films by pulsed laser ablation. By atomic force microscopy(AFM), the laser-deposited C_60 thin film was verified to have surface far smoother than the surfaces of films produced by the conventional evaporation method. The Si deposited at a He atmosphere of 0.2Torr was with about 60Å height of the Si nanoparticles, suggesting that it was uniformly deposited. We observed visible green photoluminescence spectra in the Si/C_60 multilayer films after laser annealing. It is considered that this green photoluminescence is occurred from SiC particles, which is produced reaction of Si nanoparticles with C_60 via laser annealing.
As a function of CAPP system, a technique for computer aided cutting tool selection is developed. The developed system which is one of important activities for computer aided operation planning has some input information such as part description, surface feature, part pattern, number of setup and operation sequence in a setup. Algorithm of cutting tool selection for a rotational part is developed for threading, grooving, finish cutting and rough cutting. A cutting tool with a toolholder and an insert in an operation is selected by implementation of algorithm. A cutting tool selection procedure for grooving is related to a finish cutting according to grooving types. Some important parameters for selection of a toolholder and an insert of ISO code such as holder style, tool approach angle, tool function and its direction are described. A case study is implemented to evaluate the performance of the system.