• 제목/요약/키워드: Difficulty value

검색결과 510건 처리시간 0.021초

새로운 적합도 함수를 사용한 비계량형 다차원 척도법에 대한 연구 (A Study on Non-Metric Multidimensional Scaling Using A New Fitness Function)

  • 이동주;이창용
    • 산업경영시스템학회지
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    • 제34권2호
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    • pp.60-67
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    • 2011
  • Since the non-metric Multidimensional scaling (nMDS), a data visualization technique, provides with insights about engineering, economic, and scientific applications, it is widely used for analyzing large non-metric multidimensional data sets. The nMDS requires a fitness function to measure fit of the proximity data by the distances among n objects. Most commonly used fitness functions are nonlinear and have a difficulty to find a good configuration. In this paper, we propose a new fitness function, an absolute value type, and show its advantages.

보 지역 홍수 위험도 예측모형 연구 (Forecasting Model for Flood Risk at Bo Region)

  • 권세혁;오현승
    • 산업경영시스템학회지
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    • 제37권1호
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    • pp.91-95
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    • 2014
  • During a flood season, Bo region could be easily exposed to flood due to increase of ground water level and the water drain difficulty even the water amount of Bo can be managed. GFI for the flood risk is measured by mean depth to water during a dry season and minimum depth to water and tangent degree during a flood season. In this paper, a forecasting model of the target variable, GFI and predictors as differences of height between ground water and Bo water, distances from water resource, and soil characteristics are obtained for the dry season of 2012 and the flood season of 2012 with empirical data of Gangjungbo and Hamanbo. Obtained forecasting model would be used for keep the value of GFI below the maximum allowance for no flooding during flooding seasons with controlling the values of significant predictors.

Numerical Solutio of Inverse Problem of Fuzzy Modeling with Pseudo First Order Approzimation

  • Ikoma, Norikazu;Hirota, Kaoru
    • 한국지능시스템학회:학술대회논문집
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    • 한국퍼지및지능시스템학회 1993년도 Fifth International Fuzzy Systems Association World Congress 93
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    • pp.1230-1233
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    • 1993
  • Numerical solution of inverse problem of Takagi-Sugeno fuzzy model is proposed. The method is located on the application of numerical optimization to the fuzzy model. Steepest descent method is used for the numerical optimization. We use the linear approximation of fuzzy model, called pseudo first order approximation, by fixing the membership value on the neighborhood of the corresponding input. It is introduced in order to reduce the difficulty of optimization process. The efficiency of this method is shown by a numerical experiment.

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3축 자세 제어용 센서 시스템의 구현 (Implementation of the 3 axes Attitude Control Sensor System)

  • 정종원;최우진;지석준;이기영;이준탁
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 D
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    • pp.2329-2331
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    • 2001
  • In this paper, were developed the 3 axes attitude control sensor system to control and monitoring the moving object. The proposed sensor system has been studied in Japan, America for a year ago. But it is high expensive and has a difficulty in application. To overcome these problems, proposed the 3 axes attitude control sensor system is low cost and easily applied. Proposed sensor system is equipped with the 3 gyro sensors, 2 tilt sensors and 3 MR sensors using 80C51 microprocessor for signal processing. It's output value transmit at long distance using RS232 serial communication protocol. We expect this system shall have a good performances in many applications of control and monitoring the moving object.

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밸런스빔을 이용한 미지부하 정속도 회전 (Constant Velocity Revolution of an Unknown Load Using a Balance Beam Controller)

  • 김용준;이건영
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 하계학술대회 논문집 D
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    • pp.2227-2229
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    • 2003
  • Using the gyro effect, Balance Beam Controller is developed with Samsung Corporation. Balance Beam Controller is possible to control the position of an object in air by controlling the attitude of inner gimbal. But in the unknown load inertia case, even a skilled worker it is not easy to operate a Balance Beam. That is caused by the difficulty to estimate the load inertia. If the amount of the gimbal operation is set excessively with a wrong load estimation, it can often cause accidents. To solve this problem, the control function which is revolving with velocity of the revolution has to be added to developed equipment. In this research, we analyze the characteristics of a Balance Beam(the smaller load inertia, the bigger force of restitution) using the angular velocity sensor, and present constant velocity revolving controller with estimating value of the load using this moving characteristics.

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유선 네트워크 기반의 근거리 무선 통신을 이용한 제어용 네트워크 (Control Network using Bluetooth with Wire Network)

  • 곽재혁;임준홍
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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    • pp.476-479
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    • 2003
  • Recently, Bluetooth has been regarded as a new technology for short-range wireless connection. Although initial application of Bluetooth technology has been focused mainly on replacing cables between hand-held devices due to a limited packet size and short-range, general wireless telecommunication such as PAN and Ad hoc networks via Bluetooth-equipped devices is expected to be one of the most popular applications. Wireless equipments have been used to exchange data between host and mobile unit. The exchanging data may be several bytes of control command and the value of sensors with ultra-sonic, vision sensor, and encoder from mobile robot. However, most wireless equipments have some drawbacks such as lack of authentication, large size and high price. On the other hand, the benefits of Bluetooth are small size, low power, low price except short-range. Especially, there are some difficulties when wireless modules are used in indoor environments. In this paper, a method of using wire network in Bluetooth network is investigated as a solution to overcome the short-range problem of Bluetooth and difficulty in indoor environment.

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농업정책목표(農業政策目標)의 체계화(体系化)(I) (A Study on the Systemization of Goals of Agricultural Policy(I))

  • 김충실
    • Current Research on Agriculture and Life Sciences
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    • 제2권
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    • pp.122-138
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    • 1984
  • Degree of difficulty in policy problems depends on a gap between present situation and desiriable situation. It is a international common sense that Agricultural policy is performed on the basis of protectionism, but yet it seems to be a hot issue in Korea, and there are many difficult problems in agricultural policies. Natural of these problems is interdependent. and a more efficient approach to these is to be systematic one. Therefore, in this paper, as a basic study to make more desirable agricultural policy, a basic structure for the systemization of goals or targets of Agricultural policy is studied. Because value judgement is much difficult matter in normative approach, basic goals of agricultural policy used in this study are selected among collective preference indicators which "are being required" or "should be required" clearly in our society (Korea), and the context of recent agricultural policies history in OCED countries is referenced to gain this goals in Agricultural policies.

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Auto-Coding of Cancer Registry Data in China

  • Wei, Kuang Rong;Liu, Sheng Chao;Wei, Dongling;Liang, Zhiheng;Chen, Wanqing
    • Asian Pacific Journal of Cancer Prevention
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    • 제17권6호
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    • pp.3021-3023
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    • 2016
  • The significance, difficulty and strategy of coding cancer data according to international coding standards are discussed, and the concept, methods and realization of cancer data automatic coding in cancer registries in China are introduced in the paper. Coding cancer data automatically with software could not only reduce the time, manpower and workload, while improving the accuracy and efficiency of cancer data coding, but also enhance the validity of cancer registration and the value of cancer registry data, which is of great significance.

A Defective Detector Suppression in the Short Wave Infrared Band of SPOT/VEGETATION-1

  • Han, Kyung-Soo;Kim, Young-Seup
    • 대한원격탐사학회지
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    • 제19권5호
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    • pp.403-409
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    • 2003
  • Since SPOT4 satellite contained VEGETATION 1 sensor launched, the noise in VEGETATION data was occasionally arisen a difficulty for the data traitement. Blind line noise types were studied in VEGETATION-l short wave infrared channel(SWIR). In order to provide a precis product, the procedure for removing this noise is strongly recommended. In the case that the blind values are clearly distinguished from contamination-free values a simple threshold method was applied, while a changeable threshold method was used for the blind value mixed with contamination-free values. New algorithm presented in this study is consists of two method for each type of SWIR blind. After removing blind line, there were again some residual pixels of blind, because the threshold is not determinated sufficiently low. Lower threshold could remove the blind line as well as the contamination-free pixels. Nevertheless, the results showed a good qualitative improvement as compared with other algorithm.

Standardization and Method Selection for the Trenchless Repair Technology of Sewer using Cured-in-place Pipe

  • Kim, Taeeung
    • International Journal of Internet, Broadcasting and Communication
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    • 제14권2호
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    • pp.70-78
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    • 2022
  • The trenchless entire repair technology (TERT) have many different names depending on the companies, and they have the same or similar methods as well as materials. In addition, there was quiet difficulty in application of field working and even confuse to classify for new TERT, while application criteria of TERT is not listed systematically. This study proposed standardization and method for TERT affecting by pipe condition, working materials, working method, specification/quantity per unit according to field condition, strange affairs and others. Determination criteria of defective sewer pipe has proposed to effective method which modify a criteria between Ministry of Environment and Seoul Metropolitan City. A Cured-in-place pipe (CIPP) is suitable for TERT, and the design criteria for the entire broken pipe are proposed when the pipe itself deforms more than 10%. A check lists are specimen preparing, hardening site made by clamped mold, numbers, flexural and tensile property, water leak and desquamation test, and have to use material property of minimum CIPP value depend on ISO 11296-4, ISO 11297-4, KS M3550-7 and KS M3550-9.