• Proceedings of the KWS Conference
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• 2004.05a
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• pp.240-242
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• 2004

Effect of post treatment on the fatigue strength of a box weldment was investigated in order to improve fatigue life of the weldment. The post treatment applied were the smooth grinding of weld bead, weld toe grinding and hammer peening at the weld toe. The fatigue strength of the weldment after post treatment clearly increased, compared with that of the weldment in as-welded condition. After smooth grinding of weld bead, fatigue crack initiated at the root of the weldment, while fatigue crack initiated at the weld toe for the other methods.

• Journal of applied mathematics & informatics
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• v.35 no.3_4
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• pp.231-239
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• 2017

In this paper, we prove common fixed point theorems for $\mathcal{L}$-fuzzy mappings under implicit relation in b-metric spaces. Further, results obtained for an integral type contractive condition. These theorems generalize and improve previous corresponding results.

• Journal of the Korean Statistical Society
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• v.25 no.3
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• pp.313-336
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• 1996

In this paper we consider weak convergence of some rescaled transi-tion probabilities of a real-valued, k-th order (k $\geq$ 1) stationary Markov chain. Under the assumption that the joint distribution of K + 1 consecutive variables belongs to the domain of attraction of a multivariate extreme value distribution, the paper gives a sufficient condition for the weak convergence and characterizes the limiting distribution via the multivariate extreme value distribution.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1996.11a
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• pp.230-233
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• 1996

In this paper, We intended to evaluate characteristics of XLPE/EPDM interface which exists in the cable joint. Because the fault was mainly occurred in this interface. We investigated breakdown characteristics of XLPE/EPDM double layered insulator as a funtion of temperature, pressure, annealing time, kinds of jointmaterial. It was shown that breakdown strength of XLPE/EPDM insulators is higher that of XLPE/XLPE or EPDM/EPDM

• Journal of the Korean Professional Engineers Association
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• v.40 no.6
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• pp.53-58
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• 2007

The government announced to launch tours to the Mt.Baekdu that use a direct air route through the 2007 South-North Korean leader joint declaration. The Mt.Baekdu tourism is large symbolism to the Korean people. Government and Hyundai Asan speak that propel Mt.Baekdu tourism using existent Samjiyeon airport in early time. But, air traffic and airport operation must consider safety preferentially. Present condition investigation and facility improvement of the Samjlyeon airport should be enforced first. And need facility expansion by increased demand hereafter. Compose South-North Air traffic network system to this opportunity and basis research and phase investment may have to be propelled.

• Proceedings of the Optical Society of Korea Conference
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• 2000.08a
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• pp.228-229
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• 2000

Buried channel JET-X CCDs (Joint European X-ray Telescope Charge Coupled Devices: EEV CCD12) with a deep depletion have been analyzed to provide an optimized condition for a charge storage and transfer. A maximum charge capacity has been found for the supplementary narrow channel by considering the potential distribution as a function of a mobile charge. Analysis for the depletion edges of JET-X CCDs have been successfully performed, showing good agreement with the depths estimated from X-ray detection efficiency measurements [1]. (omitted)

• Korean Journal of Adult Nursing
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• v.12 no.1
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• pp.5-16
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• 2000

The aim of this study was to investigate the differences in the level of disease condition and ADL by self-efficacy in patients with rheumatoid arthritis. The subjects of the study consisted of eighty-four outpatients with rheumatoid arthritis at a university hospital in Taegu between July 20, 1999 and August 25, 1999. The instruments used in this study were the self-efficacy developed by Lorig et al. (1989), the pain scale developed by Lee and Song(1987), the erythrocyte sedimentation rate(ESR), the pain joint count to measure disease condition scale, and the ADL scale developed by Katz et al. (1970) and Barthel(1973). Analysis of data was done by use of descriptive statistics: Pearson Correlation, Chi-square test, t-test, ANOVA and Scheffe, with the SPSS program. The major findings can be summarized as follows: 1. The first hypothesis, "There will be differences in the level of disease condition by self-efficacy in patients with rheumatoid arthritis" was partially supported. 1-1. "There will be differences in the level of pain by self-efficacy in patients with rheumatoid arthritis" was supported(F=3.422, p=.037). 1-2. "There will be differences in the level of ESR by self-efficacy in patients with rheumatoid arthritis" was the Disease Condition and supported (F=3.314, p=.041). 1-3. "There will be differences in the level of pain joints count by self-efficacy in patients with rheumatoid arthritis" was rejected(F=2.602, p=.080). 2. The second hypothesis, "There will be differences in the level of ADL by self-efficacy in patients with rheumatoid arthritis" was supported(F=7.067, p=.001). With the above results, it can be concluded that the higher level of self-efficacy contributed to the better level of disease condition and ADL in patients with rheumatoid arthritis. Therefore, by providing nursing intervention to promote the level of self-efficacy of rheumatoid arthritis patients with low self-efficacy, disease condition and ADL would be much better.

• Tunnel and Underground Space
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• v.13 no.5
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• pp.353-361
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• 2003

For RMR and Q rock mass classification at the design and construction stage, evaluation of groundwater condition is usually based upon the experience due to the restriction of available methods. Based on the results of Taejon LNG Pilot Cavern which acquire joint water pressure, inflow rate of ground water and hydraulic conductivity model, estimates from numerical analysis and analytical solutions were compared to verify each evaluation method. As the result, the Raymer(2001) approach was found to be efficient for estimating inflow rate and corresponding value.

• The Journal of Korea Robotics Society
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• v.6 no.4
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• pp.308-316
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• 2011

This work deals with development of effective redundancy resolution algorithms for the motion control of manipulator. Differently from the typical kinematically redundant robots that are attached to the fixed ground, the ZMP condition should be taken into account in the manipulator motion in order to guarantee the system stability. In this paper, a new motion planning algorithm for redundant manipulator not fixed to the ground is introduced. A sequential redundancy resolution algorithm is proposed, which ensures the ZMP (Zero Moment Point) stability, the planned operational motion, and additional sub-criteria such as joint limit index. A geometric constraint equation derived by reshaping the existing ZMP equation enables one to employ the sequential redundancy algorithm. The feasibility of the proposed algorithm is verified by simulating a redundant manipulator model.

• Journal of the Korea Safety Management & Science
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• v.2 no.4
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• pp.197-208
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• 2000

ABS sensor ring has been manufactured by powder metallurgy (P/M) method using 400 series ferrite stainless steel. The results are following. It is supposedly sufficient to use for control computer due to good experimental results of magnetic characteristics. Compared with sensor ring made by iron, 400 series ferrite stainless steel has shown a good corrosion resistance without an addition surface treatment. Thus the decreasing production process has been obtained. As a result mechanical characteristics of hardness and tensile test, 400 series ferrite stainless steel shown a good endurance when it is combined to constant velocity joint(C/V), and has a good hardness properties endurable to sand and pebble impact. The products before sintering are much more corrodible in the condition of spray test of salt water and ammonia than humidity and nitrogen condition.