• International Journal of Control, Automation, and Systems
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• v.3 no.3
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• pp.430-443
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• 2005

A general construction algorithm of the Grassmann space parameters in linear systems - so-called, the Plucker matrix, 'L' in m-input, p-output, n-th order static output feedback systems and the Plucker matrix, $'L^{aug}'$ in augmented (m+d)-input, (p+d)-output, (n+d)-th order static output feedback systems - is presented for numerical checking of necessary conditions of complete static and complete minimum d-th order dynamic output feedback pole-assignments, respectively, and also for discernment of deterministic computation condition of their pole-assignable real solutions. Through the construction of L, it is shown that certain generically pole-assignable strictly proper mp > n system is actually none pole-assignable over any (real and complex) output feedbacks, by intrinsic rank deficiency of some submatrix of L. And it is also concretely illustrated that this none pole-assignable mp > n system by static output feedback can be arbitrary pole-assignable system via minimum d-th order dynamic output feedback, which is constructed by deterministic computation under full­rank of some submatrix of $L^{aug}$.

• Korean Journal of Metals and Materials
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• v.46 no.12
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• pp.817-822
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• 2008

Metal matrix composite (MMC) materials having low electrical contact resistance based on 316L stainless steel (STS) matrix alloy with $ZrB_2$ particles were fabricated for PEMFC (Polymer Electrolyte Membrane Fuel Cell) separator by powder metallurgy (PM). The effects of the boride particle addition into the matrix alloy on microstructure, surface morphology, and interfacial contact resistance (ICR) between the samples and gas diffusion layer (GDL) were investigated. Both conventional and PM 316L STS samples showed high ICR due to the existence of non-conductive passive film on the alloy surface. The addition of the boride particles, however, remarkably reduced ICR of the samples. SEM observation revealed that the boride particles were protruded out of the matrix surface and particle density existing on the surface increased with increasing the boride content, causing increase of the total contact area between the conductive particles and GDL. ICR of the samples also decreased with increasing the boride content resulted from the increased contact area.

• The Korean Journal of Applied Statistics
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• v.7 no.2
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• pp.289-297
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• 1994

A block design will be said to have Property C if the concordance matrix can be expressed as a linear combination of Kronecker product of permutation matrices. No matrix inversions are necessary for the intrablock analysis of the block designs which possesses the Property C(Paik, 1985). In this paper, in order to show the Li type PBIB designs possesses the Property C, we suggest the structure of the concordance matrices of Li type PBIB designs are multi-nested block circulant pattern.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.42 no.4
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• pp.377-385
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• 2016

In order to investigate the possibility of Sesamum indicum L. (S. indicum) extract as an active ingredient for wrinkle-care cosmetics, we prepared 70% ethanolic extract of S. indicum and measured its elastase inhibitory activity and collagenase inhibitory activity. We also evaluated the effect of S. indicum extract on protein and mRNA expression of MMPs in fibroblast cell (CCD-986sk). For anti-wrinkle effects, elastase inhibition activities and collagenase inhibition activities were 37.8% and 45% at a dose of $1,000{\mu}g/mL$ of S. indicum 70% ethanol extract. For a cell viability test, measured on fibroblast cell by ethanol extract of S. indicum, results showed 96% with cell viability at $100{\mu}g/mL$ concentration. According to the results of western blot of ethanol extract from S. indicum the expression of the matrix metalloproteinase-1 (MMP-1), matrix metalloproteinase-2 (MMP-2), matrix metalloproteinase-3 (MMP-3) protein was decreased by 63%, 43%, 49% at $100{\mu}g/mL$ concentration. Reverse transcription-polymerase chain reaction (PCR) of ethanol extract from S. indicum showed that the expression of MMP-1, MMP-2, MMP-3 mRNA was decreased by 82%, 79%, 82% at $100{\mu}g/mL$ concentration. The findings suggest that 70% ethanol extract from S. indicum has potential as a cosmeceutical ingredient with anti-wrinkle effects.

• Journal of Acupuncture Research
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• v.24 no.2
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• pp.231-239
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• 2007

Objectives : This study was designed to investigate the relation between the matrix metalloprotease-1 gene polymorphism and facial nerve palsy in Korean population. Methods : This study was carried out on 102 facial nerve palsy patients who were treated with oriental medicine therapy at the department of acupuncture & moxibustion, hospital of Oriental medical college, Daegu Hanny University and 104 healthy control subjects. Blood samples from all subjects were obtained for DNA extraction. We have investigated the genotyping of matrix metalloprotease-1 by using Pyrosequencing. Results : The genotypes of matrix metalloprotease-l gene were G/G homozygotes, A/G heterozygotes and A/A homozygotes. There was no significant difference between the control and facial nerve palsy groups. Conclusion: We concluded that there was no significant association between matrix metalloprotease-1 gene polymorphism and facial nerve palsy in Korean population. However, the findings of this study need to be confirmed in more patients and further studies.

• Analytical Science and Technology
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• v.8 no.4
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• pp.435-442
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• 1995

A matrix modification was studied for the determination of trace bismuth in water samples by graphite furnace atomic absorption spectrophotometry. The type and quantity of modifiers as well as the use of auxiliary modifiers were investigated to realize the efficient modification. Palladium was chosen as a single modifier. By the addition of palladium($5{\mu}g/mL$) to 100 ng/mL bismuth solution, the temperatures could be raised from $500^{\circ}C$ to $1,300^{\circ}C$ for the charring and from $2,000^{\circ}C$ to $2,200^{\circ}C$ for the atomization as well as the sensitivity and reproducibility were improved. The absorbance of bismuth was maximum and not changed in the range of Pd $3-25{\mu}g/mL$. And several materials were examined as an auxiliary modifier. The mixed solution of $1{\mu}g/mL$ palladium and $200{\mu}g/mL$ nickel have raised the temperatures as with $5{\mu}g/mL$ palladium only. The maximum absorbance of bismuth was shown in the nickel concentration range of $100-300{\mu}g/mL$ in $1{\mu}g/mL$ palladium modified system. With such optimum conditions, the trace amount of bismuth in several water samples could be determined by a calibration curve method, and good recoveries were also obtained.

• Journal of the Korean Mathematical Society
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• v.48 no.6
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• pp.1125-1142
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• 2011

In this paper, we define some new sequence spaces of infinite matrices regarded as operators on $l_2$ by using algebraic properties of such the matrices under the Schur product multiplication. Some of their basic properties as well as duality and preduality are discussed.

• Computers and Concrete
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• v.4 no.3
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• pp.243-257
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• 2007

A novel method for recognition, characterization, and quantification of deterioration in bridge components and laboratory concrete samples is presented in this paper. The proposed scheme is based on grey level co-occurrence matrix texture analysis using Haar's discrete wavelet transform on concrete imagery. Each image is described by a subset of band-filtered images containing wavelet coefficients, and then reconstructed images are employed in characterizing the texture, using grey level co-occurrence matrices, of the different types and degrees of damage: map-cracking, spalling and steel corrosion. A comparative study was conducted to evaluate the efficiency of the supervised maximum likelihood and unsupervised K-means classification techniques, in order to classify and quantify the deterioration and its extent. Experimental results show both methods are relatively effective in characterizing and quantifying damage; however, the supervised technique produced more accurate results, with overall classification accuracies ranging from 76.8% to 79.1%.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.7
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• pp.93-101
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• 2010

In this paper we generate Gold-sequence by using M-sequence which is made by two primitive polynomial of GF(2). Generally M-sequence is generated by linear feedback shift register code generator. Here we show that this matrix of appropriate permutation has Hadamard matrix property. This matrix proves that Gold-sequence through two M-sequence and additive matrix of one column has one of major properties of Hadamard matrix, orthogonal. and this matrix show another property that multiplication with one matrix and transpose matrix of this matrix have the result of unit matrix. Also M-sequence which is made by linear feedback shift register gets Hadamard matrix property mentioned above by adding matrices of one column and one row. And high-speed conversion is possible through L-matrix and the S-matrix.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.3
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• pp.407-413
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• 2008

In this paper, scattering matrix for the open ended rectangular waveguide with infinite flange is derived. To validate the scattering matrix approach, load admittance $Y_{L,10}$ obtained from the present scattering matrix method is compared with the results of the previous work. The convergence for scattering matrix solution versus TE and TM mode numbers is investigated. Also far field power pattern radiated from the aperture of the waveguide is given.