• 제목/요약/키워드: Kim Sang-Ik

검색결과 1,125건 처리시간 0.023초

축차적 반응표면 분석을 통한 M&S 메타모형 구축에 관한 사례 연구 (A Case Study for Finding an Efficient M&S Meta Model through Sequential Response Surface Methodology)

  • 김상익;김용대;임용빈;최기헌;김정은
    • 품질경영학회지
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    • 제40권1호
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    • pp.49-59
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    • 2012
  • In computer simulation models the output from the computer code is often deterministic, i.e., running the code twice with the same values for the input variables would give the same output. It is discussed why the response surface method with polynomial approximation for the true response function is a good approximation to the computer experiments model. A sequential strategy to find the proper reduced quadratic polynomial model is illustrated with a case study in the military war game computer simulation model.

비접촉 Lamb-EMAT를 이용한 두께감육 평가에 관한 연구 (Non-contact Ultrasonic Technique for the Thin Defect Evaluation by the Lamb-EMAT)

  • 김태형;박익근;이철구;김용권;김현묵;조용상
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2005년도 춘계학술발표대회 개요집
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    • pp.194-196
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    • 2005
  • Ultrasonic guided waves are gaining increasing attention for the inspection of platelike and rodlike structures. At the same time, inspection methods that do not require contact with the test piece are being developed for advanced applications. This paper capitalizes on recent advances in the areas of guided wave ultrasonics and noncontact ultrasonics to demonstrate a superior method for the nondestructive detection of thinning defects simulating hidden corrosion in thin aluminum plates. The proposed approach uses EMAT(electro-magnetic acoustic transducer) for the noncontact generation and detection of guided plate waves. Interesting features in the dispersive behavior of selected guided modes are used for the detection of plate thinning. It is shown that mode cutoff measurements provide a qualitative detection of thinning defects. Measurement of the mode group velocity can be also used to quantify of thinning depth.

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반작용 휠 외란의 시야선 안정성 영향 (RWA Disturbance Effects on the LOS stability)

  • 이상욱;김동훈;전동익;오화석;김응현;김규선
    • 항공우주시스템공학회지
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    • 제2권1호
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    • pp.13-16
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    • 2008
  • The line of sight(LOS) is affected by the vibration of spacecraft. It is necessary to predict the effect of disturbance on LOS stability. Reaction wheel assembly is anticipated to be the largest disturbance source on spacecraft. The disturbance which is occurred mainly due to the mass imbalance is analyzed with harmonic numbers. The accuracy and stability are verified by probability density function with dynamic equation of the satellite motion.

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Detection Characteristics of a Novel Coupler for GIS PD Detection

  • Park, Jae-Gu;Yi, Sang-Hwa;Kim, Kwang-Hwa;Kim, Ik-Soo;Kim, Jae-Chul
    • KIEE International Transactions on Electrophysics and Applications
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    • 제3C권6호
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    • pp.224-229
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    • 2003
  • An ultra high frequency (UHF) coupler possessing ultra wide band (UWB) characteristics ranging from hundreds of MHz to several GHz is desirable for the detection of the partial discharge (PD) pulses because the pulses propagate with rise time shorter than one nanosecond in a gas-insulated substation (GIS). Thus, the authors have proposed a log-periodic antenna for GIS PD detection. Various parameters of the coupler such as frequency bandwidth, coupler gain, radiation pattern, and coupler geometry were considered throughout the simulations. The experiments for the detection characteristics of the coupler were carried out in the mock-up GIS chamber. The results indicated that the detection characteristics of the coupler are dependent on the installation angle of the coupler, the position of the coupler in the hand hole and the existence of the spacer.

Successful Combination Chemotherapy for Nasal Carcinoma in a Dog

  • Kim, Su-Gang;Cho, Seok-Ho;Kim, Keon;Park, Hee-Myung;Park, Sang-Ik;Kim, Tae-Jung;Lee, Chang-Min
    • 한국임상수의학회지
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    • 제36권5호
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    • pp.274-277
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    • 2019
  • A Miniature Schnauzer presented with bilateral mucopurulent nasal discharge and sneezing. Computed tomography of the skull revealed exudates in the nasal cavity and frontal gyrus. Nasal swab cytology showed features of an epithelial-origin tumor. Histopathologic evaluation of the biopsy specimen revealed irregular proliferation of epithelial cells and necrotized tissue. Positive immunohistochemical staining confirmed the epithelial origin of the cells. The dog was diagnosed with nasal carcinoma and was treated with a chemotherapy protocol of carboplatin and piroxicam. This report confirms the effectiveness of combination chemotherapy only without radiotherapy in a dog with nasal carcinoma and provides a guideline for providing alternative treatment.

머신러닝, 딥러닝을 이용한 통신서비스 이용고객 분석 및 이탈 예측 (Analysis of customer churn prediction in telecom industry using Machine learning & Deep learning)

  • 김상휘;김기원;김유성;윤태영;전재완
    • 한국정보처리학회:학술대회논문집
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    • 한국정보처리학회 2020년도 추계학술발표대회
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    • pp.568-571
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    • 2020
  • 최근 빅데이터 기술이 다양한 산업과 접목되고 있다. 그 중 고객 이탈 방지가 최우선인 통신사들 또한 예외가 아닐 수 없다. 이에 본 논문은 통신사 데이터에 머신러닝 알고리즘을 접목. 이탈 예측과 데이터 추이를 분석하고, 이를 시각화 하여 일목요연하게 표출하는 과정을 제공함으로서 통신사의 고객 유치 정책을 위한 토대를 마련할 것이다.