• Title/Summary/Keyword: Automatic Convergence Study

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A Study on Tunnel Excavation by Controlled Blast Vibration at Particular Environment Conditions (발파진동 제어에 의한 특수구간 터널굴착에 관한 연구)

  • Choi, Hyung-Bin;Lim, Han-Uk
    • Journal of Industrial Technology
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    • v.20 no.A
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    • pp.257-267
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    • 2000
  • It was difficult to apply conventional excavation methods in some sections from Seoul to Pusan high speed rail road construction of 1 lot 2, due to highway concrete road, gas pipe, water pipe and nearby factories with automatic control system machine. To excavate safely and efficiently in these sections new blast patterns were employed within allowable blast vibration level, by test blast and controlled vibration by sequential blast. Behaviors of the rock mass including convergence and displacement around tunnel were measured with construction works and the crack width in concrete wall was also monitored for controlling allowable limits. The results can be summarized as follow : 1. The allowable blast vibration level in structure site is less 1.0cm/sec for highway concrete, 0.5 cm/sec for gas pipe, water pipe and building housing and 0.3 cm/sec for automatic control system machine. 2. The convergence displacement, single rod extensometer and multi rod extensometer around tunnel and cracks in concrete wall were measured, it was confirmed that the measured values were converged within allowable level. 3. The empirical formular of ground vibrations with 90% confidence lines for PD-3 was given as follow. $$V_{90%}=45.549({\frac{D}{\sqrt{W}}})^{-1.353}$$

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Optimal Design of Gerotor (Ellipse1-Elliptical Involute-Ellipse2 Combined Lobe Shape) for Improving Fuel Efficiency and Reducing Noise (연비개선 및 소음저감을 위한 지로터 최적설계 (타원 1-타원형 인벌루트-타원2))

  • Kwak, Hyo Seo;Li, Sheng Huan;Kim, Chul
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.11
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    • pp.927-935
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    • 2016
  • A gerotor is suitable for miniature manufacturing because it has a high discharge per cycle and a simple structure, while also being widely used as lubrication oil of engines and the hydraulic source of automatic transmission. In the automobile industry, it has been necessary to continuously improve the flow rate and noise of internal gear pumps for better fuel efficiency through optimal gerotor design. In this study, to obtain an optimal gerotor with an ellipse-elliptical involute-ellipse combined lobe shape, an automatic program was developed for calculating performance parameters and drawing a gerotor profile. An oil pump was assembled with the optimal gerotor together with the port used at the actual field and CFD analysis was performed on this assembly using Ansys-CFX. A performance test for the oil pump was carried out and showed good agreement with the results obtained from the theoretical analysis and the CFD analysis.

Study on Automatic Production Line for Home Appliance Goods Based on Toyota Production System (TPS에 의한 가전제품의 생산라인 자동화 구축)

  • Choi, Seong-Dae;Cheong, Seon-Hwan;Yoo, Chong-Kyu
    • Journal of the Korean Society of Industry Convergence
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    • v.12 no.2
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    • pp.85-90
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    • 2009
  • The Toyota production system (TPS) developed by Toyota corporation is a management principle and production model to improve values added through elimination of waste. Since the oil shock in 1970s, the TPS has drawn the worldwide attentions as a main factor of competitiveness of Japanese manufacturing system and has been studied and implemented in many countries regardless of size and types of industry. For the correspondence to various customer's requirement, it is required to establish on time delivery procedure and to shorten lead time. Therefore it intended to establish TPS which is adopted to 7 losses reduction and JIT(Just in Time). In this paper, the automatic production line for color TV manufacturing by TPS was developed and proved to push up two times of productivity, to reduce the 25 workers at a time, and to widen the flexibility of manufacturing from 14" to 25" TV.

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A Study on Modeling Tool for Convergence of Smart Appliances (스마트 기기의 컨버전스를 위한 모델링 도구에 관한 연구)

  • Son, Hyun Seung;Kim, Woo Yeol;Kim, R. Young Chul
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.8 no.4
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    • pp.119-125
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    • 2008
  • The traditional way for convergence of smart appliances was software integrations on middleware. It is possible advantage to integrate easily and quickly with this way. But basically the middleware approach is slowly executed as it is huge the size of software. To solve this problem, we suggest a modeling tool for convergence. As we can execute and generate the automatic source code at the design phase with our modeling tool, it is possible to do software integration without the middleware. We use one example of U-Home environment to show the convergence for TV and the door lock system. With our approach, we will be able quickly to develop the convergent products what the customers desire with inexpensiveness, that is, the convergence of smart appliances without the middleware.

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A Study on Weight-sensing automatic ordering system using IoT devices (IoT 기기를 활용한 무게 감지 자동 주문 시스템에 관한 연구)

  • Han, Sahbal;Ko, Yeongjun;Kim, Jinhyeong;An, Hyoungjun;Jo, Eunsang;Kim, Jiyeong
    • Proceedings of the Korea Information Processing Society Conference
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    • 2017.11a
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    • pp.1159-1161
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    • 2017
  • 본 연구에서는 화장품, 세제, 쌀과 같은 생활용품들의 효율적인 관리를 위해 IoT 기기를 활용하여 무게를 감지하여 자동 주문을 하는 시스템을 제안한다. Hardware에서 생활용품의 무게를 지속적으로 sensing하고 BLE(Bluetooth Low Energy)를 통해 Android Application으로 데이터를 전송한다. Android Application에서 생활용품들의 상태를 저장하고 일정 무게 이하로 감소 시 Push Alarm으로 사용자에게 상품 재주문 제안 및 상품 추천을 한다. 이를 바탕으로 생활용품 관리의 번거로움을 줄이고 사용자의 생활물품의 소모 양상을 데이터화 할 수 있다.

A Study on UML based Modeling and Automatic Code Generation for Embedded Software (UML 모델 기반 임베디드 소프트웨어 모델링 및 코드 자동 생성 기법 연구)

  • Ryu, Hodong;Lee, Woo Jin
    • Journal of Convergence Society for SMB
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    • v.2 no.1
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    • pp.33-40
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    • 2012
  • Recently, embedded environment suffers a huge change, by growth of hardware and turning to be software-controlled. This has improved embedded software complexity. It also brought us the limit of the old development way to resolve the problem. Model-driven development is one solution to solve the limit common software development by previous way, and it became a one uses for embedded environment also. In this paper, we propose model based development approach for embedded software, witch consists of diagram editor and automatic code generator. The diagram editors are implemented by GMF, which include additional functions to solve memory restrictions and concurrent execution problems without OS environment to a automatic code generator. In order to verify the generated code, it will be tested in main control model of UAV by replacing existing module with generated one.

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A Study on the Development of an Automatic Multi-Nozzle Injection Molding Machine (Multi-Nozzle Injection Molding Automatic Machine 개발에 관한 연구)

  • Lee, Jong-Hyung;Kim, Jung-Hwan;Yi, Chang-Heon;Kim, Yun-Gon;Lim, Chun-Kyoo;Lee, Chun-Kon;Kwon, Yung-Shin
    • Journal of the Korean Society of Industry Convergence
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    • v.10 no.2
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    • pp.123-128
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    • 2007
  • The demand for the precision rubber products has been rapidly increasing with the recent growth of industries. And the requirement for the productivity and the quality calls out for the injection molding machines with the precision machining ability as well as the high productivity. Especially modern automobile industry is in urgent need of developing injection molding machines for the high quality rubber products with high productivity. And the inability of the domestic companies to meet the standards causes importing foreign machines and as a result spending good amount of dollars. It is extremely important to develop competitive machines and strengthen the infrastructure of the related industries. In this paper the functions and the structure of a automatic multi-nozzle injection molding machine has been studied to set up a proper test system for the precision rate and the reliability of the machines, which can help build the machines to meet the request of the industry.

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Automatic Recognition of Direction Information in Road Sign Image Using OpenCV (OpenCV를 이용한 도로표지 영상에서의 방향정보 자동인식)

  • Kim, Gihong;Chong, Kyusoo;Youn, Junhee
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.31 no.4
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    • pp.293-300
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    • 2013
  • Road signs are important infrastructures for safe and smooth traffic by providing useful information to drivers. It is necessary to establish road sign DB for managing road signs systematically. To provide such DB, manually detection and recognition from imagery can be done. However, it is time and cost consuming. In this study, we proposed algorithms for automatic recognition of direction information in road sign image. Also we developed algorithm code using OpenCV library, and applied it to road sign image. To automatically detect and recognize direction information, we developed program which is composed of various modules such as image enhancement, image binarization, arrow region extraction, interesting point extraction, and template image matching. As a result, we can confirm the possibility of automatic recognition of direction information in road sign image.

A Study for Complexity Improvement of Automatic Speaker Verification in PDA Environment (PDA 환경에서 자동화자 확인의 계산량 개선을 위한 연구)

  • Seo, Chang-Woo;Lim, Young-Hwan;Jeon, Sung-Chae;Jang, Nam-Young
    • Journal of the Institute of Convergence Signal Processing
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    • v.10 no.3
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    • pp.170-175
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    • 2009
  • In this paper, we propose real time automatic speaker verification (ASV) system to protect personal information on personal digital assistant (PDA) device. Recently, the capacity of PDA has extended and been popular, especially for mobile environment such as mobile commerce (M-commerce). However, there still exist lots of difficulties for practical application of ASV utility to PDA device because it requires too much computational complexity. To solve this problem, we apply the method to relieve the computational burden by performing the preprocessing such as spectral subtraction and speech detection during the speech utterance. Also by applying the hidden Markov model (HMM) optimal state alignment and the sequential probability ratio test (SPRT), we can get much faster processing results. The whole system implementation is simple and compact enough to fit well with PDA device's limited memory and low CPU speed.

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Integrated Automatic Pre-Processing for Change Detection Based on SURF Algorithm and Mask Filter (변화탐지를 위한 SURF 알고리즘과 마스크필터 기반 통합 자동 전처리)

  • Kim, Taeheon;Lee, Won Hee;Yeom, Junho;Han, Youkyung
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.37 no.3
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    • pp.209-219
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    • 2019
  • Satellite imagery occurs geometric and radiometric errors due to external environmental factors at the acquired time, which in turn causes false-alarm in change detection. These errors should be eliminated by geometric and radiometric corrections. In this study, we propose a methodology that automatically and simultaneously performs geometric and radiometric corrections by using the SURF (Speeded-Up Robust Feature) algorithm and the mask filter. The MPs (Matching Points), which show invariant properties between multi-temporal imagery, extracted through the SURF algorithm are used for automatic geometric correction. Using the properties of the extracted MPs, PIFs (Pseudo Invariant Features) used for relative radiometric correction are selected. Subsequently, secondary PIFs are extracted by generated mask filters around the selected PIFs. After performing automatic using the extracted MPs, we could confirm that geometric and radiometric errors are eliminated as the result of performing the relative radiometric correction using PIFs in geo-rectified images.