• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.2570-2575
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• 2003

Monitoring a power transmission line is significant for power electric companies. In this paper, we propose a new method for detecting an fault point of power transmission line by use of M-sequence correlation technique. In this method, detecting signal is used as one or plural M-sequences ( same characteristic polynomial, including normal and reverse mark, synchronized ). In receiving point, we make same sequence with the input one and take crosscorrelation function between M-sequence and the received signal. We can see transfer fanctions of plural paths between inputs and a output taps separated from different of delay times on the crosscorrelation function, and from these transfer fanctions, so we compare them when fault occurred with in usual.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.540-545
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• 2002

The tight integration of the part design and process planning is very effective to high quality product development and cost effective manufacturing. Moreover, the integration in the early design stage, that is, the integration of the conceptual design and the conceptual process planning may take a big impact with the forecasting the alternative of the design and manufacturing. In this paper, the real field parts are studied about the relations among the Feature, Function, and Manufacturing Process taking the style of reverse engineering method, to found the base of the systematic computer system for the integrated product design and manufacturing process planning.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.140-142
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• 2005

This paper describes the current- based compact digital motor protective relay for low and high voltage induction motors, which are widely used in industrial and commercial power systems. The existing protective relays for motor protection had only overload, short circuit, reverse phase, open circuit and grounding protective elements, and measurement, start/stop control function. But in present day, for automation system, various functions are required, especially motor management and sequence control function and more. To meet these requirements, we developed an economic current-based compact digital motor protective relay which had various function to control, manage and monitor the induction motor.

• 소성∙가공
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• 제18권4호
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• pp.329-335
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• 2009

In order to better predict the springback for friction stir welded DP590 steel sheet, the combined isotropic-kinematic hardening was formulated with considering the permanent softening behavior during reverse loading. As for yield function, the non-quadratic anisotropic yield function, Yld2000-2d, was used under plane stress condition. For the verification purposes, comparisons of simulation and experiments were performed here for the unconstrained cylindrical bending, the 2-D draw bending tests. For two applications, simulations showed good agreements with experiments.

• 한국기계기술학회지
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• 제13권4호
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• pp.131-136
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• 2011

In commercial vehicle, sub-frame which equipped in main frame supporting dump deck and oil tanker. This is the main structure for all equipment which including joint function. Sub-frame is made by welding process, this susceptible to deform and crack by its longitudinal size. Also various kind of sub-frame make it difficult to standardization in manufacturing process and exclusive jig is not adapted yet. Frame size is over 6~8m and weight is more than 300kg this make re-work more difficult. If manufacturing company made precise sub-frame, this is not only convenient for customers but also save the company money by reducing the working time. In this study manufacture the sub-frame be suitable for its main function and develop exclusive welding jig for obtain checking fixture function as well.

• 한국초전도ㆍ저온공학회논문지
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• 제21권3호
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• pp.6-12
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• 2019

Extended Drude model has been used to obtain information of correlations from measured optical spectra of strongly correlated electron systems. The optical self-energy can be defined by the extended Drude model formalism. One can extract the optical self-energy and the electron-boson spectral density function from measured reflectance spectra using a well-developed usual process, which is consistent with several steps including the extended Drude model and generalized Allen's formulas. Here we used a reverse process of the usual process to investigate the extended Drude analysis when an additional low-energy interband transition is included. We considered two typical electron-boson spectral density model functions for two different (normal and d-wave superconducting) material states. Our results show that the low-energy interband transition might give significant effects on the electron-boson spectral density function obtained using the usual process. However, we expect that the low-energy interband transition can be removed from measured spectra in a proper way if the transition is well-defined or well-known.

• 한국운동역학회지
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• 제15권2호
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• pp.57-67
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• 2005

The purpose of this study was to analyze the kinetic factors of the golf driver swing using the Inverse Dynamics function. For this purpose, joint force were calculated. In order to test the possibility of Inverse Dynamics function(motion-dependent interaction), a triple segmental system was set for wrist, left shoulder and lumbar and joint force working on the anatomical joint region was estimated. For this study, 7 professional golfers were sampled, and then, their driver swings were recorded with two high-speed digital video cameras (180 frames/sec.) to be synthesized into 3-dimensional images and coordinated. Then, Eular's equation was used to produce some kinematic data, which were used to calculate joint force and torque with Newton's function. All data were calculated using LabVIEW 6.1 graphic program. The results of this study can be summarized as follows; It was found that the joint force was generated on wrist, shoulder and lumbar joints in the direction of the target, and that the joint force was stronger in the direction of target immediately before impact. The joint force was generated towards the target to activate the nodes, and then, it was generated in the reverse direction to increase the speed during impact.

• 한국식품영양과학회지
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• 제36권8호
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• pp.960-964
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• 2007

천연생리활성물질 소재로서 파고지 추출물의 안전성을 검증하기 위하여 렛트에 대한 단회 경구투여 독성 평가와 복귀돌연변이평가를 실시하였다. 파고지 에탄올 추출분말 2 g/kg, 5 mL를 암${\cdot}$수 각각 5마리씩 경구 투여한 후 14일 동안의 일반증상, 체중변화 및 부검시의 육안적 소견을 관찰한 결과, 사망례, 일반증상 및 체중변화는 관찰되지 않았고 부검결과에서도 특이할 만한 육안적 이상소견은 관찰되지 않아, 파고지 추출물은 $LD_{50}$값이 렛트 체중 kg당 2g 이상이며 단회 경구 투여에 대한 독성을 가지는 않는 것으로 평가되었다. 파고지 추출분말의 복귀돌연변이 유발성 여부는, 히스티딘 요구성 Salmonella Typhimurium TA98, TA100, TA1535, TA1537 균주 및 트립토판 요구성 Escherichia coli WP2uvrA(pKM101) 균주를 이용하여 S9 mix 첨가 여부에 따라 실험하였다. 용량설정시험 결과, S9 mix 첨가 여부에 관계없이 사용한 모든 시험균주에서 생육저해가 관찰되었다. 시험물질의 석출은 S9 mix 첨가 여부와 상관없이 사용한 모든 시험균주의 1,250, 2,500 및 5,000 ${\mu}g/plate$에서 관찰되었지만 콜로니 계수에는 영향이 없었다. 따라서, 본 시험의　용량은 S9 mix 미첨가 TA100, TA1537 균주 및 S9 mix 첨가 RA1535 균주의 경우에는 생육저해가 관찰된 625 ${\mu}g/plate$를, S9 mix 첨가 여부에 관계없이 TA98 균주 및 S9 mix 첨가TA100, TA1537, WP2uvrA(pKM101) 균주의 경우에는 생육저해가 관찰된 1,250 ${\mu}g/plate$를, S9 mix 미첨가의 TA1535 및 WP2uvrA(pKM101) 균주의 경우에는 2,500 ${\mu}g/plate$를 최고용량으로 하였고, 그 이하 공비 2로 최고용량을 포함한 5용량의 시험물질군과 음성대조군 및 양성대조군으로 하여 실험을 실시하였다. 그 결과, 모든 시험균주에서 시험물질에 의한 복귀변이 콜로니수는 S9 mix의 첨가 여부에 관계없이 용량의존적으로 증가되지 않았으며, 음성대조군과 비교하여 2배 이상의 증가를 보이지 않았다. 시험물질에 의한 균주의 생육저해는 S9 mix첨가 여부에 관계없이 사용한 모든 시험균주의 최고용량에서 관찰되었다. 시험물질의 석출은 S9 mix 첨가 여부에 관계없이 1,250 및 2,500 ${\mu}g/plate$에서 관찰되었지만 콜로니 계수에는 영향이 없는 것으로 나타났다.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2001년도 춘계학술대회
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• pp.235-239
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• 2001

The purpose of this study is to develop an insurance system for product quality liability(PQL) by reviewing some legal issues concerning the product liability It is concluded that the purpose and the function of PQL insurance have to be considered with robust experience data for the life of product, quality system of the company, size of company, the number and amount of products produced by a company and the type of company etc. And this article reviews some problems of policy including the possibility of anti-selection and reverse selection.

• Kyungpook Mathematical Journal
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• 제50권2호
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• pp.297-306
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• 2010

In this paper, the integral operator is used. We give a new Hilbert-type integral inequality, whose kernel is the homogeneous form with degree - $\lambda$ and with three pairs of conjugate exponents and the best constant factor and its reverse form are also derived. It is shown that the results of this paper represent an extension as well as some improvements of the earlier results.