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Evaluation of the Settlement Influence Factors of Shallow Foundation by Numerical Analyses
Odgerel Enkhtur,Tien Dung Nguyen,김진만,김성률 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.1
Several empirical and analytical methods have been proposed to estimate the elastic settlement of shallow foundations based on the elastic continuum theory. Previous methods have been generally proposed for circular foundations, its approach of using equivalent diameter was found less reliable for foundations of aspect ratio L/B > 2. This paper presents a three-dimensional numerical analysis to extend and improve the applicability of settlement influence and correction factors for shallow foundations of large aspect ratios. First, a methodical optimization and verification program was conducted to determine and verify a reliable model for numerical analysis. Using the verified model, two new sets of settlement influence factor and correction factor for foundation roughness of circular and rectangular foundations were then derived and proposed. A correction factor chart for the foundation rigidity of rectangular foundations was also proposed. Finally, the applicability of the proposed factors in this study was verified by comparing calculated settlements using the proposed factors along with the measured values from two raft foundations. The proposed approach was indicated to be a better alternative for foundations of L/B > 2.
Monitoring System of Agriculture Fields using ZigBee Modules
Odgerel Ayurzana,Sugir Tsagaanchuluun 한국인터넷방송통신학회 2021 Journal of Advanced Smart Convergence Vol.10 No.1
The goal of this study is to develop experiment monitoring system of agriculture fields using ZigBee wireless modules. Soil moisture, ambient temperature, atmospheric pressure and intensity of sunlight are the most important factors to grow a wheat crop and other vegetables. In order to monitor the factors soil moisture (YL69), air pressure (BMP180), temperature (DS18B20), photoresistor were used for sensing environment data. The TI CC2530 RF SoC chip was used in the system. ZigBee modules were connected to star topology. ZigBee modules send data wirelessly to a data center. This data can be displayed and analyzed on the main monitoring program as needed also sent to the client mobile. Characteristics of the sensors were determined by experiment results.
리드 스위치 센서를 이용한원격 검침용 상수도 계량기에서 채터링 오차 감소 방안 연구
Odgerel Ayurzana,김희식 대한전자공학회 2007 電子工學會論文誌-SC (System and control) Vol.44 No.4
To reduce the chattering errors of reed switch sensors in the automatic remote measurement of water meter, a reed switch sensor was analyzed and improved. The operation of reed switch sensors can be described as a mechanical contact switch by approximation of permanent magnet piece to generate an electrical pulse. The reed switch sensors are used mostly in measurement application to detect the rotational or translational displacement. To apply for water flow measurement devices, the reed switch sensors should keep high reliability. They are applied for the electronic digital type of water flow meters. The reed switch sensor is just mounted simply on the conventional mechanical type flow meter. A small magnet is attached on a pointer of the water meter counter rotor. Inside the reed sensor, two steel leaf springs make mechanical contact and apart repeatedly as rotation of flow meter counter. The counting electrical contact pulses can be converted as the water flow amount. The MCU sends the digital flow rate data to the server using the wireless communication network. But the digital data is occurred difference or errors by chattering noise. The reed switch sensor contains chattering error by it self at the force equivalent position. The vibrations such as passing vehicle near to the switch sensor installed location causes chattering. In order to reduce chattering error, most system uses just software methods, for example using filter algorithm and also statistical calibration methods. The chattering errors were reduced by changing leaf spring structure using mechanical hysteresis characteristics. 상수도 원격 검침에서는 리드 스위치의 채터링 오차를 감소시키기 위한 센서 연구 및 개선이 필요하다. 센서의 동작은 전기적 펄스를 발생시키기 위한 영구 자석 주각의 접근에 의한 기계적 접촉스위치처럼 나타낼 수 있다. 대부분 회전 또는 전달 이동을 잡기 위해 사용되고 수류 측정 장치에 적용하기 위해서는 높은 신뢰성이 필수이다. 동작 형태를 간단히 설명하게 되면 미터기 작동 모터 끝에 달려있는 작은 자석이 미터기 회전에 의해 리드 스위치 내부에 있는 두 개의 스프링과 기계적 접촉 형식으로 반복적으로 떨어지게 된다. 즉 수류량에 따라 펄스의 수가 증가하는 것이다. 이렇게 측정된 값은 무선 이동 통신을 통해 서버로 전달되게 된다. 문제는 자석과 리드 스위치가 만나는 지점에서 스위치가 멈추게 되면 떨리면서 펄스가 잘못 올라가는 오차가 생기는 것이다. 이러한 오차를 감소시키기 위해 보통 소프트웨어적인 방법을 사용한다. 필터 알고리듬을 사용하는 것과 통계적인 보정방법을 사용하는 것이 그러한 예이다. 하지만 그러한 방법보다는 하드웨어적으로 문제를 해결하는 것이 오차를 줄일 수 있는 더 직접적인 방법이다. 본 논문에서는 기계적인 이력현상의 특성을 이용하여 리프 스프링 구조의 변화로 오차를 감소시키는 연구를 수행하였다.
An Improved Dempster-Shafer Algorithm Using a Partial Conflict Measurement
Odgerel, Bayanmunkh,Lee, Chang-Hoon Korean Institute of Intelligent Systems 2016 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.16 No.4
Multiple evidences based decision making is an important functionality for computers and robots. To combine multiple evidences, mathematical theory of evidence has been developed, and it involves the most vital part called Dempster's rule of combination. The rule is used for combining multiple evidences. However, the combined result gives a counterintuitive conclusion when highly conflicting evidences exist. In particular, when we obtain two different sources of evidence for a single hypothesis, only one of the sources may contain evidence. In this paper, we introduce a modified combination rule based on the partial conflict measurement by using an absolute difference between two evidences' basic probability numbers. The basic probability number is described in details in Section 2 "Mathematical Theory of Evidence". As a result, the proposed combination rule outperforms Dempster's rule of combination. More precisely, the modified combination rule provides a reasonable conclusion when combining highly conflicting evidences and shows similar results with Dempster's rule of combination in the case of the both sources of evidence are not conflicting. In addition, when obtained evidences contain multiple hypotheses, our proposed combination rule shows more logically acceptable results in compared with the results of Dempster's rule.
Reed Switch 센서를 이용한 원격 검침용 상수도 계량기에서 Chattering 오차 감소 방안 연구
Odgerel Ayurzana,권종원(Jong-Wok Kwon),박용만(Yong-Man Park),구상준(Sang-Jun Koo),김희식(Hie-Sik Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
To reduce the chattering errors of reed switch sensors used for automatic remote measurement of water supply system, a reed switch sensor was analyzed and improved. The operation of reed switch sensors can be described as a mechanical contact by approximation of permanent magnet piece to generate an electrical pulse. The reed switch sensors are used in measurement application by detecting the rotational or translational displacement. To apply for flow measurement devices, the reed switch sensors should keep high reliability. They are applied for the electronic digital type of water flow meters. The reed switch sensor is just installed simply on the mechanical type flow meter. A small magnet is attached on a pointer of the water meter counter rotor. Inside the reed sensor, two steel leaf springs make mechanical contact and apart as rotation of flow meter counter. The counting electrical contact pulses can be converted as the water flow amount. The MCU sends the digital flow rate data to the server using the wireless communication network. But it occurs data difference or errors by chattering noise. The reed switch sensor contains chattering error by it self at the force equivalent position. The vibrations such as passing car near to the switch sensor installed location. In order to reduce chattering error, most system uses just software methods for example using filter and also statistical calibration methods. The chattering errors were reduced by changing leaf spring structure using mechanical hysteresis characteristics.