• Journal of Environmental Science International
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• v.14 no.10
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• pp.929-935
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• 2005

The Monitoring System developed in this study was designed to help manage the recreational forests by gathering data on visitors' profiles and their opinions about recreational use and related facilities, This data could identify for changing situations in forest recreation demand as well as providing information on planning the management and use of the forest areas in advance. The standardized questionnaire had contained visitor profiles, activities, distribution of use by area, distribution us by time, duration of the visit, expenditure of visitors and information on visitor satisfaction and motivation. Also, the questionnaire had included the evaluations visitors' perception of facilities in order to identify the importance and performance of the various facilities, such as recreational and educational facilities, accomodations, directional signs as well as infrastructure. The monitoring system was developed in the object-oriented programming (OOP) environment. Microsoft Visual Basic 6,0 for the program language, Microsoft Access, and Excel program were used to develop the system. The monitoring system was composed of data input, database, and data analysis system, Once data were put into data input system, it automatically transferred to database, and it eventually produced the results of statistical analysis with one step procedure. This study was integrated with facilities and visitor monitoring system to identify the visitor impact at the recreational forests. In addition, this monitoring system would provide necessary and useful background information for management on recreational use of natural resources in a practical manner.

• 제어로봇시스템학회:학술대회논문집
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• 1993.10a
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• pp.1178-1182
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• 1993

Variable-displacement pumps are inherently more efficeint than fixed-displacement pumps under varying loads. Their energy-saving characteristics can be improved by the use of special control. This paper shows the improvement of the system by the use of load-sesing technique.

• 전기의세계
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• v.24 no.5
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• pp.32-37
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• 1975

The use of a Microprocessor and PROM memories in an Electronic Loop Switching System has been described. The use provides telephone service for up to 128 subscriber lines using 32 trunks with increased reliability, maintenance capabilities, and flexibility. Date Communication between the central office terminal and the remote terminal is by FSK at 1-KHz rates over an idle trunk. Software functions and traffic handling capabilities are also described.

• Journal of the Korean Graphic Arts Communication Society
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• v.11 no.1
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• pp.57-69
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• 1993

Currently, Computer-To-Plate printing system comes into wide use, an accurate color simulation system is demanded. This paper is described some basic operational expressions known in the simulation of colors by use of halftone dots, and is proposed improved color prediction of multicolor halftone, The experimental results show that proposed color predict Eq. is useful and valid in predicting the color reproduction of multicolor halftone.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.506-507
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• 2015

Our scheme going to use the advanteges of shadow technical and use it in flash memory. With our scheme we can maintain the system from corruption by making a capy table for table mappinng. It is make us to recover the data easily when something unusually happen to the system.

• 제어로봇시스템학회:학술대회논문집
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• 1993.10b
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• pp.150-154
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• 1993

A new method is proposed for obtaining Volterra kernals of a nonlinear system by use of a nonlinear systems by use of pseudorandom M-sequences and correlation technique. M-sequence is applied to a nonlinear technique. M-sequence is applied to a nonlinear system and the crosscorrelation function between the input and the output displays not only the linear impulse response of the linear part of the system, but also crosssections of the Volterra kernals of nonlinear system. Simulations are carried out for up to 3rd order Volterra kernal, and the results show a good agreement with the theoretical considerations.

• Journal of the Korean Data and Information Science Society
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• v.17 no.2
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• pp.395-400
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• 2006

For lab statistics the statistical package SAS is usually used in PC environment. But most Universities in Korea have bought 'Academic Initiative Package chair licence', which allows to install SAS to student lab PCs only. Most students are hardly able to afford to purchase a licence for use of SAS in their PCs at home or other places than school. It would be very convenient to have a web-based SAS system, physically located inside a campus, which university students can use through internet. In this paper we report the web-based SAS system implemented for the lab purpose of Yeungnam University using SAS/Intrnet module. We overcome some Server-Client environmental difficulties not allowing use of the SAS command 'infile' by implementing modules with PHP language. In the system, users can see and execute some basic SAS sample codes by clicking buttons, which makes students feel comfy in SAS programming.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.05a
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• pp.195-198
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• 2002

Demand for high precision measurement of large area is increasing in many industrial fields. White-light Scanning Interferometer(WSI) is a well-known method for 3D profile measurement. However WSI has some limitations in a measurement range because of the sensing mechanism. Therefore, in this paper we use a heterodyne laser interferometer to get over the limitations of a short measurement range in WSI, We suggest a new WSI system combined with heterodyne laser interferometer. This system is aimed at eliminating Abbe error with measuring the focus point directly. With the use of triggering functionality of WSI, we can use this system as a probe of a precision stage such as a probe of CMM. The suggested system gives a repeatability of 87 nm in the absolute distance measurement test under the laboratory environment.

• Journal of Institute of Control, Robotics and Systems
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• v.21 no.9
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• pp.827-835
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• 2015

In this paper, we present the implementation method of Dynamic Matrix Control(DMC) block for use with a Rapid Control Prototyping(RCP) system and consider the speed control of a DC motor using the developed DMC block. Firstly, we briefly introduce a lab-built RCP system. Secondly, we present a method for implementing a DMC block using C-language, which enables the DMC algorithm to be represented in a library block that can be used in a Simulink environment. Finally, we use the developed DMC block for the speed control of a DC motor, through which we show that the DMC-based control system can be easily implemented and applied to the real-time control of systems with relatively fast dynamics.

• Proceedings of the KSME Conference
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• 2000.04a
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• pp.809-813
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• 2000

In this study, screw machining system by use of a rotational tool such as an end-mill or a face cutter with Y axis off-set on a CNC turing center was developed for quick machining. In this system, It was possible to use different tools for different processes, and by off-setting the tool in Y direction by calculated amount it was possible to avoid tool interference problem which could occur within the central area at the end of a tool. In addition, machining a screw with a helix of up to 3 different leads combined and with tapered minor diameter was possible.