• Title/Summary/Keyword: the pass rate

Search Result 583, Processing Time 0.033 seconds

Analysis of Multi-Pass Wet Wire Drawing Process and Its Application (다단 습식 신선공정 해석 및 적용)

  • Lee S. K.;Kim B. M.
    • Transactions of Materials Processing
    • /
    • v.14 no.8 s.80
    • /
    • pp.689-695
    • /
    • 2005
  • Multi-pass wet wire drawing process is used to produce fine wire in the industrial field. The production of fine wire through multi-pass wet wire drawing process with appropriate dies pass schedule would be impossible without understanding the relationship among many process parameters such as material properties, dies reduction, friction conditions, drawing speed etc However, in the industrial field, dies pass schedule of multi-pass wet wire drawing process has been executed by trial and error of experts. This study investigated the relationship among many process parameters quantitatively to obtain the important process information fur the appropriate pass schedule of multi-pass wet wire drawing process. Therefore, it is possible to predict the many important process parameters of multi-pass wet wire drawing process such as dies reduction, machine reduction, drawing force, backtension force, slip rate, slip velocity rate, power etc. The validity of the analyzed drawing force was verified by FE simulation and multi-pass wet wire drawing experiment. Also, pass redesign was performed based on the analyzed results, and the wire breakage between the original pass schedule and the redesigned pass schedule was compared through experiment.

A Method to Calculate a Pass Rate of the ${\gamma}$-index Analysis in Tomotherapy Delivery Quality Assurance (DQA) (단층치료기를 이용한 방사선 치료의 환자별 정도관리 평가를 위한 감마인덱스의 정량화 방법)

  • Park, Dahl;Kim, Yong-Ho;Kim, Won-Taek;Kim, Dong-Won;Kim, Dong-Hyun;Jeon, Ho-Sang;Nam, Ji-Ho;Lim, Sang-Wook
    • Progress in Medical Physics
    • /
    • v.21 no.4
    • /
    • pp.340-347
    • /
    • 2010
  • DQA, a patient specific quality assurance in tomotherapy, is usually performed using an ion chamber and a film. The result of DQA is analysed with the treatment planning system called Tomo Planning Station (TomoPS). The two-dimensional dose distribution of film measurement is compared with the dose distribution calculated by TomoPS using the ${\gamma}$-index analysis. In ${\gamma}$-index analysis, the criteria such as 3%/3 mm is used and we verify that whether the rate of number of points which pass the criteria (pass rate) is within tolerance. TomoPS does not provide any quantitative information regarding the pass rate. In this work, a method to get the pass rate of the ${\gamma}$-index analysis was suggested and a software PassRT which calculates the pass rate was developed. The results of patient specific QA of the intensity modulated radiation therapy measured with I'mRT MatriXX (IBA Dosimetry, Germany) and DQA of tomotherapy measured with film were used to verify the proposed method. The pass rate was calculated using PassRT and compared with the pass rate calculated by OmniPro I'mRT (IBA Dosimetry, Germany). The average difference between the two pass rates was 0.00% for the MatriXX measurement. The standard deviation and the maximum difference were 0.02% and 0.02%, respectively. For the film measurement, average difference, standard deviation and maximum difference were 0.00%, 0.02% and 0.02%, respectively. For regions of interest smaller than $24.3{\times}16.6cm^2$ the proposed method can be used to calculate the pass rate of the gamma index analysis to one decimal place and will be helpful for the more accurate DQA in tomotherapy.

Development of Analysis Program for Multi-Pass Wet Wire Drawing Process and Its Application (습식 다단 인발공정 해석 프로그램 개발 밀 적용)

  • 이상곤;김민안;김병민;조형호
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.20 no.9
    • /
    • pp.126-134
    • /
    • 2003
  • This paper investigates the multi-pass wet wire drawing process considering the slip between the wire and the capstan. The production of fine wire through multi-pass wet wire drawing process would be impossible without backtension. The backtension is affected by many process parameters, such as slip, dies reduction, coiling number of wire at the capstan, machine reduction, characteristic of lubricant etc. Up to date, die design and dies pass schedule of multi-pass wet wire drawing process have been performed by trial and error of expert in the industrial field. In this study, an analysis program which can perform the analysis and considering the effect of slip at each capstan was developed. The effects of many important parameters (drawing force, backtension force, needed power, slip rate, slip velocity rate etc.) on multi-pass wet wire drawing process can be predicted by this developed program. It is possible to obtain the important basic data which can be used in the pass schedule of multi-pass wet wire drawing process by using this developed program.

Pass Redesign for Reduction of Wire Breakage in the Wet Wire Drawing Process (습식 신선공정의 단선율 저감을 위한 패스 재설계)

  • Lee S. K.;Kim M. A.;Kim B. M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2002.11a
    • /
    • pp.71-77
    • /
    • 2002
  • The Production of fine wire through wet wire drawing process with appropriate pass schedule would be impossible without understanding of relationship among many process parameters. Therefore, this paper investigates the relationship among process parameters of wet wire drawing process. In this study, it is possible to obtain the important basic data that can be used in the pass schedule of multi-pass wet wire drawing process. In order to verify the effectiveness of the analysis, pass redesign was performed based on the result of analysis to reduce the wire breakage. The wire breakage between the conventional pass schedule and the redesigned pass schedule was compared by the FE analysis and the wet win drawing experiment.

  • PDF

Development of One-Pass Rice Whitener with Cutting Blades of Hard Metal (초경날식 절삭형 완패스정미기의 개발)

  • 정종훈
    • Journal of Biosystems Engineering
    • /
    • v.22 no.2
    • /
    • pp.199-209
    • /
    • 1997
  • A one-pass rice whitener with hard metal blades was developed to solve the problems of the existing one-pass rice whitener. The developed one-pass rice whitener was tested and improved through various milling experiments. It showed high performance such as the capacity of 3.5 t/h, the energy consumption of $1.0 kWh/100kg$, milled rice recovery of 91.6%, broken rice rate of 2.2%, the crack rate of 1.9% at the 750 rpm of the roller shaft, compared with those other domestic and foreign one-pass rice whiteners. Especially, it could whiten broun rice of high moisture (16~l7%) with water sprayed at low internal pressure of less than $0.2 kg/cm^2$ and low temperature due to the characteristics of the cutting part composed of 24 hard metal blades. The developed one-pass rice whitener was industrilized and distributed to some rice processing complexs in one fourth price compared with that of imported one-pass rice whiteners.

  • PDF

Fast Preprocessing Technique based on High-Pass Filtering for Spool Rate Extraction of Weak JEM Signals (약한 제트 엔진 변조 신호의 Spool Rate 추출을 위한 High-Pass Filtering 기반의 빠른 전처리 기법)

  • Song, Won-Young;Kim, Hyung-Ju;Kim, Sung-Tai;Shin, In-Seon;Myung, Noh-Hoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.30 no.5
    • /
    • pp.380-388
    • /
    • 2019
  • Jet engine modulation(JEM) signals are widely used for target recognition. These signals coming from a potentially hostile aircraft provide specific information about the jet engine. In order to obtain the number of blades, which is uniquely provided by the JEM signal, one must extract the spool rate, which is the rotation speed of the blades. In this paper, we propose an algorithm to extract the spool rate from a weak JEM signal. A criterion is developed to extract the spool rate from the JEM signal by analyzing the intensity of the JEM signal component. The weak signal is first subjected to a high-pass filtering-based process, which modifies it to facilitate spool rate extraction. We then apply a peak detection process and extract the spool rate. The technique is simpler than the existing CEMD or WD method, is accurate, and greatly reduces the time required.

Development of Analysis Program for Multi-Pass Wet Wire Drawing Process (습식 다단 인발공정 해석 프로그램 개발)

  • Lee S. K.;Kim B. M.;Kim M. A.;Park B. K.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2001.10a
    • /
    • pp.216-219
    • /
    • 2001
  • The production of fine wire through multi-pass wet wire drawing process would be impossible with no backtension at inlet of dies. Backtension is affected by many process parameters, such as dies reduction, coiling number of wire at capstan, machine constant, slip between wire and capstan, characteristic of lubricant and so on. Up to date, dies design and dies pass schedule of multi-pass wet wire drawing process have performed by trial and error of expert in the Industrial field without consideration of quantitative relation among process variables. Thus study investigates the multi-pass wet wire drawing process considering the relation among process variables, such as dies reduction, coiling number of wire at capstan, machine constant, slip between wire and capstan, etc. And analysis program which can analyze many important process values(drawing force, backtension force, slip rate, slip velocity rate, etc) for die design and dies pass schedule of multi-pass wet wire drawing process was developed.

  • PDF

The Change in Exchange Rate Pass-Through into Import Price of the Post-FTA Import Market for Fishery Products in South Korea (FTA 이후, 국내 수입수산물 가격의 환율전가도 변화)

  • Lim, Eun-Son
    • The Journal of Fisheries Business Administration
    • /
    • v.53 no.2
    • /
    • pp.21-41
    • /
    • 2022
  • The effect of change in exchange rates on an economy is very important, especially, to a small open economy like South Korea. I explore whether Free Trade Agreements (FTAs) have positive influences on exchange rate-pass through import price of import market for fishery products in South Korea. Competition among FTA partners is enhanced after FTAs are effective. I expect that the extent to which are exchange rate pass-through (hereafter, ERPT) into import price of fishery products (in terms of Korea currency) would be reduced since the import market for fishery products in South Korea is an oligopolistic market. Specifically, I investigate two research questions with six South Korea's FTA partners-Norway, Thailand, Peru, U.S., China and Vietnam. First, whether the extent to which are exchange rate pass-through into import price of fishery products from six FTA partners would decrase in the post-FTA era; seconds, the size of reduction has a negative relation with the size of their market share in the import market for fishery products in South Korea if it decreases. The empirical results indicate that the degree of ERPT into import price from other FTA partners than Norway has been reduced after FTA, statistically and significantly; however, I do not find the evidence that the size of reduction is related to their market share. The findings in this study imply that FTAs have negative effects on producers' economic welfare in South Korea's fishery industry by reducing the extent to which are exchange rate pass-through as well as reducing tariff barriers.

Declines in Exchange Rate Pass-through to Export Prices in Korea (우리나라 수출가격에 대한 환율전가율 변화)

  • Lee, Hangyong;Kim, Hyeon-Wook
    • KDI Journal of Economic Policy
    • /
    • v.31 no.2
    • /
    • pp.235-266
    • /
    • 2009
  • This paper investigates changes in the extent of exchange rate pass-through to export price in Korea. First, empirical results show that export prices have become less responsive to the exchange rate since the financial crisis in 1997. The decline of exchange rate pass-through to export prices suggests that Korean exporters are more likely to use profit margins to absorb part of the impact of exchange rate changes, consistent with pricing to market phenomenon. Second, this paper finds asymmetries in the response of export prices to exchange rate changes. In the post-crisis period. appreciations are more likely to be offset by markup adjustment than depreciations. Third, this paper documents that a significant portion of the decline of exchange rate pass-through is a result of both increased volatility of exchange rate and increased competition with China in the world market.

  • PDF

Pass Schedule Design for Improvement of Drawing Speed in the Dry Wire Drawing Process (신선 속도 향상을 위한 건식 신선 공정의 패스스케줄 설계)

  • 김영식;김동환;김병민;김민안;박용민
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2000.11a
    • /
    • pp.600-603
    • /
    • 2000
  • In the high carbon steel wire drawing process, the wire temperature increases as the drawing speed is faster in order to increase the production rate in the shop floor. The rapid temperature rise causes the wire fracture in the dry wire drawing process. So, in this paper, the isothermal pass schedule program, which includes the calculation method of wire temperature at each pass, is proposed to prevent the wire fracture due to the temperature rise. Using the isothermal pass schedule program, it is newly proposed the pass schedule design system that prevents the cup-cone defects, improves the elongation of the final products and assures further deformation. As a result, the temperature rise of the wire was decreased and the production rate of the final product is remarkably grown up according to the increase of the final drawing speed than that of the conventional process. Also, the proposed pass schedule design system could give a useful information to the process designer who would design the high carbon steel wire drawing process.

  • PDF