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In this paper, we proposed a total information system model for cheju farming industv. The purpose of the model is to provide the useful informations and services about cheju farmings. For this purpose, we analized the various types of the cheju farming system. And analized the distribution channels of the agricultural products. And surveyed the kind of agricultural informations needed for the peasants. Using the surveyed data, we designed a computer information system moodel which is conceptually attached on the ISDN.
Process planning is the task of generating a plan for transforming raw material to finished part according to CAD informations and manufacturing prcatice. The task of process planning includes the determination of the sequence of a part. machines, and tools. In this paper. we proposed a flexible process planning model for the process sequence and machines selection on process planning problems. Process sequencing should consider a set of constraints imposed by the design information and manufacturing practice. Determination of an optimal machining process sequencing for complex parts results in the need to consider a large solution space. This paper presents an improved method for process sequences and machines selection that permits the efficient application of genetic algorithms. To apply the genetic algorithm to the process sequencing and machines selection problem, the representation, selection, and genetic operators are studied, and then modified genetic algorithm for optimal machining process sequencing and machine tools selection is proposed.
In this paper, an ATM cell monitor/control algorithm is proposed to enhance the efficiency of bandwidth management and statistical multiplexing for various types of cell traffics. This algorithm is based on the usage parameter control and bandwidth allocations. The traffic is monitored and controlled by counters, lookup table and cell control unit to reduce the burden of the traffic overload. And for the bandwidth management the entire bandwidth is separated into two classes : the basic bandwidth is allocated to each type of traffic and the shared bandwidth may be used when more bandwidth is required due to the burst. The network resources can be allocated to more virtual connections accordingly.
Silicon micromachining technology can be used to build microsensors and actuators by using tools derived from standard IC processing. For the silicon micromachining the etching characteristics of tetramethyl ammonium hydroxide (TMAH) by dissolving silicon powder or silicic acid have been studied. The 3, 5 and 10wt.% TMAH solutions, with dissolved silicon powder (6g/l) or with dissolved silicic acid(Si(OH)4, 16g/l) were used. And ammonium peroxydisulfate (APODS, 2g/l) dissolved in the solutions were also used. The etch rates of silicon and the etched surface roughness were observed with various etching conditions. The crystallographical aspect on the crystal orientation of silicon have been studied. With sufficiently fresh solutions, these TMAH concentration and combination of etchants, provide repeatable etch properties, does not attack exposed aluminum or silicon dioxode, and provide smooth (100) silicon surfaces.
Appraising an image of a city. we first consider a street landscape. which depends on its shape and colors and so on outside colors of building are affected by features of location and symbolic meanings in buildings. Therefore. A purpose of this study is to realize we have any need to plan colors of buildings to make a beautiful street of a city and to search for Jeju landscape. The procedure to satisfy the purpose is as following : First. I studied a theory of colors. Second after choosing Top-Dong as a place to have JeJu peculiar characters. I surveyed the present condition of colors on the street and analyzed it to see if there are problems on it. Third. I suggested better alternatives by looking up Jeju peculiar colors. based on studies in the reference. It is expected that this study helps an appropriate plan of environmental colors improve the identity of the area.
濟州産 감자의 장기 저장을 위하여 방사선을 5 Krad 10 Krad 및15 Krad로 照射한 것과 照射하지 않은 것 및 各 線量과의 품질상의 차이를 비교하였다. 放射線 照射는 부패방지에는 별 효과가 없다는 것을 알 수 있었고 5 Krad는 10 Krad나 15 Krad와 비교 할 때 너무 線量이 낮았으며 10 Krad가 15 Krad보다 더 효율적이었다. 같은 선량에서는 실외에 통풍이 잘되게 저장한 것이 실내에 밀폐된 공간에 저장한 것 보다 저장효과가 높게 나타났다. For extension of storage with Cheju grown potatoes, irradiations with doses of 5 Krad, 10 Krad and 15 Krad were applied and the differences of quality were compared between the irradiated and the unirradiated and also between doses. Irradiation is not effective on the prevention of decaying. Irradiation of 5 Krad is too low compare with 10 Krad and 15 Krad and 10 Krad is more effective and energy saving than 15 Krad. Among same irradiation doses, outdoor storage showed better quality than those stored in enclosed space in the room.
The B-ISDN(Broadband-Integrated Service Digital Network) transports various multimedia information effectively. So optical switching networks which consist of optical transmission links and photonic switching systems are noticeable as a way of a large capacity communication. In this paper, we propose optical packet switching networks which will be used as the backbone network of national high speed communication networks which are operated a way of ATM(Asynchronous Transfer Mode). The B-ISDN transport networks are composed of two-layered networks such as regional networks and a backbone network. The regional network is an average ATM transport network. The optical backbone network gathers fixed length of several ATM cells which come from regional networks, attaches an optical header, and completes an optical packet. And then the network switches and transports with high speed. That is, the backbone network is a transparent optical packet network. The passing speed of signal in the photonic switch is rapid, but the switching speed is limited and the processing speed of the switching controller which consists of electronic circuit is limited. So the optical packet which consists of multi-ATM cells is able to overcome it in the optical backbone network. The performance evaluation by the computer simulation shows us the efficiency of the proposed way of optical packet switching.
This paper presents the new control method of aeronautical ground lighting conrol system at Jeju airport. In the computer simulation. it is shown how to make a design for high efficiency aeronautical ground lighting control system using PWM inverter and active power filter with PI control. To verify the theoretical analysis. the conventional aero lighting control system using SCR and the proposed control system are built. Results of computer simulation are presented to support discussion.
A micro-vacuum sensor has been fabricated by using silicon micromachining techniques and platinum thin film. NON insulator was deposited by LPCVD and APCVD methods. The insulator diaphragm was fabricated by silicon anisotropic etching in TMAH solution. Thin film platinum heater and temperature detector were deposited by rf sputtering method and patterning was performed by means of lift-off method. Deposited platinum heater and temperature detector have been shown a linear Ⅰ-Ⅴ characteristics. TCR(temperature coefficient of resistance) of thin film platinum heater and temperature detector was about 0.0042/℃. Fabricated vacuum sensor was measured in the range of 1x10³Torr to 1×10² Torr, and shows a good linear operating characteristics in the range of 1x10² Torr에서 1x10˚Torr.