• Title/Summary/Keyword: cut

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Mineral Composition Properties of Collapsed Cut Slope (붕괴절토사면의 광물조성 특성)

  • Kim, Jin-Hwan;Koo, Ho-Bon;Park, Mi-Sun;Baek, Young-Sik
    • Proceedings of the Korean Geotechical Society Conference
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    • 2005.03a
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    • pp.731-734
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    • 2005
  • Cut slopes are collapsed in Korea every year. Cut slope collapses cause a loss of lives and assets. Many researchers make clear collapse factor of cut lope. Fresh rock weathered through reaction undergroundwater and groundwater. During weathering process, weathered minerals are created. Weathered minerals are analysed by X-ray diffraction meter. X-ray diffraction meter make possible quantity assessment of degree of weathering and indicator of potential collapse possibilities. This paper discuss possibilities of cut slope dangerous with analysis of weathered minerals of cut slope.

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A Study on the Cutting Resistance Characteristics of Hardended Steel according to Engagement Condition (물림조건에 따른 경화강의 절삭저항 특성에 관한 연구)

    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.5 no.3
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    • pp.58-65
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    • 1996
  • This thesis is concerned with the study on the characteristics of the cutting resistance occurring in finish machining of hardened steels such as carbon tool steel and alloy tool steel by a ceramic tool with nose radius. For the purpose, the shape of cutting cross-section made at nose part of the tool was analyzed geometrically and the wear mechanism on the flank face of the ceramic tool is investigated. In order to investigate the characteristics of cutting resistance two categories of cutting conditions are suggested, along with geometrical analysis. One category includes the conventional cutting parameters such as feed and depth of cut, another containing new cutting parameters of thickness of cut and width of cut etc. Thickness of cut width of cut and area of undeformed chip section formed by the condition of engagement between workpiece and cutting tool are determined as the function of feed, depth of cut and nose radius of cutting too, And an effective approach angle is determined by depth of cut and nose radius.

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A Study on the Optimization of Slot Cut in the End Milling Processes (엔드밀에 의한 슬롯가공의 최적화에 관한 연구)

  • Choi, Jong-Guen;Kim, Hyung-Sun
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.6
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    • pp.38-43
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    • 2006
  • A slot cut in end milling processes is one of the laborious works because the cutting force is likely to deflect the tools excessively, then to make large errors or to fracture the tool. This difficulty is owing to the poor stiffness of slender shaped end mills. Though, in most cases, additional finish cuts are followed after rough cuts, the accuracy of rough cuts is still important because it affects the final accuracy after finish cuts and productivity. The accuracy in slot cuts depends on the tool stiffness and the cutting conditions including depth of cut and feed. In order to meet the desired accuracy, diameter of end mill and cutting allowance have to be selected carefully. This study suggests several guidances for selecting the end mill diameter and the slot cut allowance to improve machining accuracy and productivity in slot end millings. Some experiments were done with the various cutting parameters of tool diameter, depth of cut and feed.

Development and evaluation of new drilling and blasting method for excavaton of rock mass with one free surface (일자유면 암반 굴착을 위한 신바파공법의 개발 및 평가)

  • 임재웅;윤영재;서정복
    • Tunnel and Underground Space
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    • v.4 no.3
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    • pp.237-249
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    • 1994
  • A new type of cut method, called SK-cut, was developed in order to overcome the shortcomings of the conventional V-cut and Burn-cut blasting methods. Total 190 times of test blasts were performed for the evaluation of the efficiency of new blasting method. V-cut, Burn cut and SK-cut were compared by applying them to the excavation of main gallery and construction tunnel of underground oil storage cavern. Test results showed that excavation efficiency of the new method was increased by 5.9~9.8% and that specific charge was reduced to 71~92%.

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A Study on Near Cut-In Performance Comparison on Adaptive Cruise Control Stop&Go (ACC Stop&Go 시스템의 근접 Cut-In 성능 비교에 대한 연구)

  • Lee, Dong-Han;Cho, Cheol-Ho
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.2
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    • pp.103-109
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    • 2012
  • Adaptive cruise control Stop&Go system has been developed to reduce the driver's workload on highway or public road. This system is characterized by a moderate control of engine and brake actuator. A control system capable of modeling driver's driving characteristics has been constructed to provide natural vehicle behavior in full speed driving. But, ACC Stop&Go system has some limitations. One of the limitations is a detection limitation on near cut-in situation. This paper presents development of the near cut-in test procedure, finding of the limitation value on near cut-in scenario and performance comparisons on ACC Stop&Go system.

Correlation Analysis between Inventory data and danger grade of Cut slope in Chungcheongdo (충청도 내 일반국도 절토사면의 현황자료와 위험도간의 상관성분석)

  • Kim, Jin-Hwan;Rhee, Jong-Hyun;Kim, Seung-Hyun;Lee, Jung-Yup;Koo, Ho-Bon
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.10a
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    • pp.980-983
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    • 2008
  • KICT has been carrying out inventory research on the cut slopes of national roads. Inventory research results are basic data used in cut slope management system. Inventory data are classified by general status, cut slope characteristics and inspector opinion. Cut slope inventory data are utilized to figure out dangerous slopes and decide survey ranking of detailed safety diagnostication. This paper will draw dangerous cut slope and more important inventory data in Chungcheongdo via correlation analysis.

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An experimental study for reduction of B.P.F. noise level of multi-blade fan (다익 송풍기의 이산 주파수 소음 저감을 위한 실험적 연구)

  • 김영찬;이상환
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.11 no.2
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    • pp.167-175
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    • 1999
  • B.P.F.(Blade Passing Frequency) levels were measured with the cut-off clearance changes. The velocity inside the scroll, pressure fluctuation at cut-off region, and the scroll surface pressure distribution along the scroll from the cut-off to outlet were measured. With a certain cut-off clearance the improvement of efficiency and attenuation of B.P.F. noise level could be achieved. The measured results of pressure fluctuation and scroll surface pressure distribution showed that the secondary flow inside the scroll increased B.P.F. noise level at the cut-off region as the cut-off clearance got wide.

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Cut off Sampling and Estimation (절사법과 추정)

  • 한근식
    • Proceedings of the Korean Association for Survey Research Conference
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    • 2003.06a
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    • pp.29-33
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    • 2003
  • In business survey. cut off sampling is usual. The contribution from cut off part of the population is at least small in comparison with the remaining population. In this study. the population have been separated as three stratum, cut-off. take-some, take-all, and we will estimate cut-off part.

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A study on the development of the computer aided part programming system 'AUTO-CUT' for wire-cut EDM (와이어 컷 방전 가공을 위한 자동프로그래밍 시스템 AUTO-CUT의 개발에 관한 연구)

  • 이재원;강신한;강호진
    • 제어로봇시스템학회:학술대회논문집
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    • 1987.10b
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    • pp.255-259
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    • 1987
  • This paper introduces the system AUTO-CUT for the automatic generation of NC tapes for wire-cut EDM (Electrodischarge Machining) parts. The information input to the system is the description of the part geometries, the tool motions and the cutting conditions etc. The system generates CLDATA. Also dynamic graphic display of the tool motions can be-performed on the screen.

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A study of Full Width at Half Maximum(FWHM) according to the Filter's Cut off level in SPECT camera (SPECT filter의 cut off level에 따른 반폭치(FWHM) 크기에 관한 연구)

  • Park, Soung-Ock;Kwon, Soo-Il
    • Journal of radiological science and technology
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    • v.26 no.2
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    • pp.63-69
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    • 2003
  • Filtering is necessary to reduce statistical noise and to increase image quality in SPECT images. Noises controled by low-pass filter designed to suppress high spatial frequency in SPECT image. Most SPECT filter function control the degree of high frequency supression by chosing a cut of frequency. The location of cut off frequency determines the affect image noise and spatial resolution. If select the low cut off frequency, its provide good noise suppression but insufficient image quantity and high cut off frequencies increase the image resolution but insufficient noise suppression. The purpose of this study was to determines the optimam cut off level with comparison of FWHM according to cut off level in each kiters-Band-limited, Sheep-logan, Sheep-logan Hanning, Generalized Hamming, Low pass cosine, Parazen and Butterworth filter in SPECT camera. We recorded image along the X, Y, Z-axis with $^{99m}TcO_4$ point source and measured FWHM by use profile curve. We find averaged length is $9.16\;mm{\sim}18.14\;mm$ of FWHM in X, Y, and Z-axis, and Band-limited and Generalized Hamming filters measures 9.16 mm at 0.7 cycle/pixel cut off frequency.

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