• 제목, 요약, 키워드: base point

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CONVERGENCE OF PREFILTER BASE ON THE FUZZY SET

  • Kim, Young-Key;Byun, Hee-Young
    • Korean Journal of Mathematics
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    • v.10 no.1
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    • pp.5-10
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    • 2002
  • In this paper, we investigate the prefilter base on a fuzzy set and fuzzy net ${\varphi}$ on the fuzzy topological space (X,${\delta}$). And we show that the prefilter base $\mathcal{B}({\varphi})$ determines by the fuzzy net ${\varphi}$ converge to a fuzzy point $p$ iff the fuzzy net ${\varphi}$ converge to a fuzzy point $p$. Also we prove that if the prefilter base $\mathcal{B}$ converge to a fuzzy point $p$, then the $\mathcal{B}$ has the cluster point $p$.

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Possibility of Obtaining Lubricant Base Oil from Talakan Crude Oil Suitable for Exploitation in Extremely Cold Conditions in the Republic of Sakha (Yakutia)

  • Zhirkov, N.P.;Zakharova, S.S.;Sung, Zoo-One
    • Tribology and Lubricants
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    • v.31 no.1
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    • pp.28-34
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    • 2015
  • This paper addresses the problems of using anti-freeze lubricants for different machines that must function at extremely low temperatures during winter operation in the Republic of Sakha (Yakutia). We discuss the possibility of obtaining anti-freeze base oils from Talakan crude oil, an area with major oil and gas deposits of the Republic of Sakha, and also provide the trade and technological classification of Talakan crude oil. We propose two different schemes for processing Talakan crude oil: the fuel scheme (obtaining light and heavy fractions as a fuel oil) and the base oil scheme (obtaining light fractions and base oils). We investigate the influence of pour point depressants on alkyl-methacrylate base on the low-temperature properties of the fractions obtained from Talakan crude oil and Korean base oils, and establish the optimal concentration of pour point depressants. We compare the properties of these fractions with the low-temperature properties of Korean base oils and find that the commercial oil "Ravenol 0W-40" provides optimistic results. We obtain oil with a pour point of minus $50^{\circ}C$ and a viscosity index greater than 100. The Design of Experiment was used to establish the optimum composition of the pour point depressants and the base oil S-8 to obtain lubricant oil with a kinematic viscosity of 17 cSt, viscosity index of 208, and a pour point of minus $64^{\circ}C$.

End-point control of a flexible arm under base fluctuation

  • Chonan, Seiji;Sato, Hidehiro
    • 제어로봇시스템학회:학술대회논문집
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    • pp.600-605
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    • 1989
  • A theoretical study is presented for the end-point holding control of a one-link flexible arm, whose base is subjected to a lateral fluctuation. The arm is clamped on a rigid hub mounted directly on the shaft of d.c. servomoter. The tip position is measured by a gap sensor fixed in space isolated from the system vibration. The arm is controlled so as to make the end point stay precisely at its initial position even if the base is fluctuated.

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SHEAR BOND STRENGTH AND FAILURE PATTERNS ACCORDING TO THE THICKNESS OF RESIN BASE IN BRACKET BONDING (브라켓 부착시 레진 베이스의 두께에 따른 전단결합강도와 파절양상에 관한 연구)

  • Kim, Jae-Hyuk;Hwang, Hyeon-Shik
    • The korean journal of orthodontics
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    • v.28 no.4
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    • pp.659-668
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    • 1998
  • The purpose of this study was to evaluate the possibility of the decrease of bond strength due to increased thickness of resin base in indirect bracket bonding technique. Metal brackets were bonded to the resin blocks involving bovine lower incisors and the thickness of resin bases was increased by increments of 0.5 mm from 0.0 mm to 2.0 mm. They were divided into two groups, one group is that the thickness of resin base was increased but the loading point from the tooth surface was maintained constantly, the other group is that the loading point from the tooth surface and the resin base thickness were increased concomitantly. The shear bond strength was tested on universal testing machine and the failure patterns were assessed with the adhesive remnant index(ARI). The results were as follows: 1. When the distance from the tooth surface to the loading point was maintained constantly, shear bond strength was increased significantly according to the decrease of distance from the bracket base to the loading point and the increase of resin base thickness. 2. When the distance from the tooth surface to the loading point and the resin base thickness were increased concomitantly, shear bond strength was decreased according to the increase of resin base thickness but significant differences were ignorable. 3. There were no significant differences in ARI scores according to the change in the thickness of resin base. The results of the present study indicated that shear bond strength was not much affected by the thickness of resin base, whereas was decreased according to the increase of distance from bracket base to the loading point.

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Development of Absolute Moment Block Truncation Coding Algorithm using Flexible Base Point(Mean of Block) (이동기준점을 이용한 AMBTC 알고리즘 개발)

  • Choi, Yong-Soo
    • Journal of The Institute of Information and Telecommunication Facilities Engineering
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    • v.10 no.2
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    • pp.80-85
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    • 2011
  • In this paper, I propose flexible base point used for a BTC(Block Truncation Coding). Halftoning images are used for printer by reducing the number of pixel depth. During over 20 years, many researches have been studied to apply this techniques to image compression. BTC algorithms are the compression methods using digital halftoning technique about images. In the BTC algorithm, an image block is divided into higher and lower domain compared with the mean of block. then the MAX and MIN representative values are evaluated by calculating the mean of higher and lower domain respectively. At a result, an image block(for example 88 size) is compressed into 64bits pixel representation and 16 bits of the MAX and MIN. And they also have been tried to sustain the image quality high after compression. In this paper, I found that there is some marginal possibility to enhance the image quality by adjusting the base point(generally mean of block) of existing algorithms.

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Study for determining cross docking point local bases approach (크로스도킹 거점 결정을 위한 연구 -지역거점을 중심으로-)

  • Kim, Ki-Hong
    • Journal of the Korea Safety Management & Science
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    • v.19 no.3
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    • pp.129-135
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    • 2017
  • The respective delivering vehicle loaded with the own cargo moves into the respective delivery area. At the base, the delivery points D1 and D2, for example, have the same starting point but the destination is different. The average delivering time of the delivery vehicle is mostly more than 8 hours a day. Therefore, the efficiency of delivery is generally low. In this study, the deliveries will be forwarded from a base station to a delivery point where cross docking will be applied to a single vehicle, and will be distributed from the cross docking point through cross docking. If the distribution is implemented, one vehicle will not have to be operated from the base to the cross docking point. In that case, logistics cost will be reasonably saved by the reduction of transportation cost and labor time. If one vehicle only runs from the base to the cross docking point, each vehicle will be operated in two shifts, and the vehicle operation can be efficiently implemented. This research model is based on the assumption that the 3 types of ratios between the traffic volume of the vehicles starting at the base and the vehicles waiting at the cross docking point are set to the first ratio of 30% to 70%, the second ratio of 50% to 50% and the final ratio of 70% to 30%. As a result of the study, The delivery time in the cross docking point is much higher than that in present on the condition that the cargo volume in the D2 area is more than 50%. Likewise, the delivery time is slightly higher on the condition that the cargo volume is less than 50%. Time is reduced in terms of 50% model like AS-IS model.

The Research about Efficient Control of the Territorial Base Point (영해기준점의 효율적 유지관리 방안에 관한 연구)

  • Choi, Yun-Soo;Kim, Jae-Myeong;Yun, Chang-Beom
    • Spatial Information Research
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    • v.18 no.1
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    • pp.39-48
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    • 2010
  • Recently, many countries are promoting the rapid development of marine for securing territorial sea. The importance of territorial sea has being emphasized as territorial disputes among countries has been increasing. The South Korea should be encouraged to expand the territory due to territorial disputes with neighborhood countries. The purpose of this study is to derive a improvement plan for the efficient control of the territorial base point through analyzing the existing territorial base point and checking the territorial base point. Therefore, we proposed a variety of new plans for accurate positioning by sea level observation and MBES, reduced the surveying procedure through analyzing the existing territorial base points and provided a basis for the territorial base points which can be the 2nd grade national control points by improving a grade. We also suggested that the territorial base points and sub-territorial base points' database should be given standardized number for increasing the efficient management of other national control points and territorial base points. Finally, we suggested a improved work regulation about analysis and maintenance for territorial base points, the information activity of territorial base points and the new plan of community relations. This study will be a basis for the foundation of maritime territory which could be superior to other countries and the expansion of maritime territory.

Fast Generation of Elliptic Curve Base Points Using Efficient Exponentiation over $GF(p^m)$) (효율적인 $GF(p^m)$ 멱승 연산을 이용한 타원곡선 기저점의 고속 생성)

  • Lee, Mun-Kyu
    • Journal of KIISE:Computer Systems and Theory
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    • v.34 no.3
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    • pp.93-100
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    • 2007
  • Since Koblitz and Miller suggested the use of elliptic curves in cryptography, there has been an extensive literature on elliptic curve cryptosystem (ECC). The use of ECC is based on the observation that the points on an elliptic curve form an additive group under point addition operation. To realize secure cryptosystems using these groups, it is very important to find an elliptic curve whose group order is divisible by a large prime, and also to find a base point whose order equals this prime. While there have been many dramatic improvements on finding an elliptic curve and computing its group order efficiently, there are not many results on finding an adequate base point for a given curve. In this paper, we propose an efficient method to find a random base point on an elliptic curve defined over $GF(p^m)$. We first show that the critical operation in finding a base point is exponentiation. Then we present efficient algorithms to accelerate exponentiation in $GF(p^m)$. Finally, we implement our algorithms and give experimental results on various practical elliptic curves, which show that the new algorithms make the process of searching for a base point 1.62-6.55 times faster, compared to the searching algorithm based on the binary exponentiation.

The study on the Base point and baseline in Korea, Japan, and China (한반도 주변의 영해기점 및 기선에 관한 연구 - 한국, 중국, 일본을 중심으로)

  • Kim, Baek-Su;Choi, Yun-Soo;Park, Byung-Moon;Jeon, Chang-Dong
    • Spatial Information Research
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    • v.16 no.3
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    • pp.331-342
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    • 2008
  • The countries are trying to expand the sea limit such as the territorial sea, fishing zone or the exclusive economic zone as far as the Law of the Sea permit to do for the benefit of their national interest. Especially, they are eager to claim the base point where it locates far from the coastline even if it is uninhabited island or reef under the sea. The baseline has been claimed to maximize the territorial sea. Another way to expand the sea limit is to lower the vertical datum to change the land limit. China claimed Dongdo which is located about 79 miles far from the coast as the base point. Japan also claimed many uninhabited island or the reef which is located very far from the coast such as Okino Dorishima. As Korea is the party who negotiate the maritime limit with Japan and China, we should be keen and sensitive on the issues claimed by neighboring countries in terms of base point and the baseline. This paper is to review the characteristics of the base points or baselines of neighboring countries and to suggest the views how to maintain and to relocate our base points. As western coast of Korean peninsula is one of the largest tide fluctuation zone in the world, with long tidal record to prove the vertical datum adjustment, Korea can find the way to lower the vertical datum especially in Yellow Sea. So, major and critical tidal station has to be set up along the western coast to verify tide fluctuation record which can be met with international standard.

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