• Journal of the Korean Arthroscopy Society
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• v.12 no.3
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• pp.147-153
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• 2008

Several methods to resurface the lost cartilage of the knee have been used; multiple drilling, microfracture, abrasion arthroplasty. Resurfaced cartilages resulting from above techniques are mostly fibrocartilage. Autologous osteochondral graft transfer and autologous chondrocyte transfer are known to resurface the lost cartilage with mostly hyaline cartilage. This article reviews basic researches, indications, operative technique, and clinical results of autologous osteochondral graft transfer.

• Journal of Plant Biology
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• v.33 no.4
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• pp.217-223
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• 1990

Restriction enzyme inhibiting substance (REIS) extracted from spinach chloroplast and Chlamydomonas seems not to be proteinaceous, because its inhibiting activity was not lost by heat or trypsin treatment. And it seems not to be lipid or polysacchride, because its inhibiting activity was not lost by lipase or $\alpha$-amylase treatment, respectively. In Chlamydomonas, putrescine, spermidine and spermine were present. The amount of putrescine was the smallest and that of spermie was the greatest. But only spermine was contained in REIS and the activity of REIS. It was proportional to the amount of spermine in REIS and it was hindered by Na+ ion. So, the inhibiting activity of REIS seems to be deeply related to spermine contained in REIS. But restriction enzyme inhibiting activity remained to the some extent although salts and spermine were eliminated by dialysis.

• The Journal of the Korean dental association
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• v.48 no.1
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• pp.56-62
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• 2010

In recent years, a number of special treatment procedures have been introduced to reestablish new tooth supporting tissues with varying degrees of success including guided tissue regeneration(GTR), bone grafting(BG) and the use of enamel matrix derivative(EMD). EMD is an extract of enamel matrix and contains amelogenins of various molecular weights. Emdogain(EMD) might have some advantages over other methods of regenerating the tissue supporting teeth lost by gum disease, such as less postoperative complications. Emdogain contains proteins(derived from developing pig teeth) believed to regenerate tooth attachment. The decrease in probing depth after EMD treatment is achieved primarily by clinical attachment gain and bone regeneration and only to a minor extent by gingival recession. In conclsion, EMD seems to be safe, was able to regenerate lost periodontal tissues in previously diseased sites based on clinical parameters.

• Journal of the Korean Home Economics Association
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• v.25 no.4
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• pp.1-8
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• 1987

The effects of Aspergillus niger H-18(AN) and A.fumigatus E-29(AF) on the deterioration of test materials were examined. 1. When the fungi were inoculated to the cotton fibers placed on Czapeck agar, malt extract agar, and potato agar, they grew best on potato agar which in that context was chosen as a basal medium for deterioration studies. The tensile strength of ontton fiber on which AN was grown for 30 days decreased by 33.9% with a concommitant increase in elongation by 43.1%. 2. Cotton fabric lost the weight by 1.35%, when inoculated with AN while it lost the weight by 0.86% when inoculated with AF. 3. When AN and AF were inoculated separately on cotton fibers, tensile strength decreased by 52.8% and 43.3%, respectively, with concommitant increases in elongation by 34.2% and 29.4%, respectively. 4. The cotton was damaged more severely by AN than AF, when they were observed by scanning electron microscope.

• Journal of Korea Multimedia Society
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• v.18 no.3
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• pp.287-297
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• 2015

A railway security detection system is very important. There are many safety factors that directly affect the safe operation of trains. Security detection technology can be divided into passive and active approaches. In this paper, we will first survey the railway security systems and compare them. We will also propose a subway security detection system with computer vision technology, which can detect three kinds of problems: the spark problem, the obstacle problem, and the lost screw problem. The spark and obstacle detection methods are unique in our system. In our experiment using about 900 input test images, we obtained about a 99.8% performance in F- measure for the spark detection problem, and about 94.7% for the obstacle detection problem.

• Journal of Korean Library and Information Science Society
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• v.32 no.1
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• pp.103-124
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• 2001

This study analyzed the various aspects in writing the lost ancient medical book Yunbang, whose title listed on no other catalogs. And examined the bibiiographical properties of Yunbang by analyzing and comparing the citations collected from the book Sanlirngyoungiae. Yunbang, the collective empirical prescriptions of native medicines, is supposed to be made by the Yun families during the period of from the mid 17th to the early part of 18th centuries.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.01a
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• pp.273-277
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• 2009

A compressed video stream is very sensitive to transmission errors that may severely degrade the reconstructed image. Therefore, error resilience is an essential problem in video communications. In this paper, we propose novel temporal error concealment techniques for recovering lost or erroneously received macroblock (MB). To reduce the computational complexity, the proposed method adaptively determines the search range for each lost MB to find best matched block in the previous frame. And the original corrupted MB split into for $8{\times}8$ sub-MBs, and estimates motion vector (MV) of each sub-MB using its boundary information. Then the estimated MVs are utilized to reconstruct the damaged MB. In simulation results, the proposed method shows better performance than conventional methods in both aspects of PSNR.

• Journal of Korea Foundry Society
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• v.36 no.5
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• pp.153-158
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• 2016

The lost foam casting process was used to fabricate Al-Si-Mg cast specimens, and the effects of the chemical composition and process variables on the tensile properties and the mold filling ability were investigated. Some porosity formation was observed in thick sections of the casting and better tensile properties were obtained for thin sections, presumably because of their lower porosity and the higher cooling rate. Tensile properties were not clearly enhanced by grain refining treatment with Ti; however, the elongation was significantly improved by Sr modification of the Al-Si-Mg alloy. The mold filling distance was generally proportional to the pouring temperature of the melt, and the distance was also increased by the addition of Ti.

• Journal of the Korean Home Economics Association
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• v.30 no.2
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• pp.53-60
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• 1992

The effects of Aspergillus fumigatus(AF) and Penicillium citrinum(PC) deterioration of test materials were examined. When the fungi were inoculated to the silk fibers placed on Czapeck agar, malt extract agar and potato agar, they grew best on potato agar which in that context was chosen as a basal medium for deterioration studies. The tensile strength of silk fiber on which AF was grown for 30 days decreased by 28.5% with a concommitant increase in elongation by 40.1%. Silk fabric lost the weight by 4.74%, when inoculated with AF while it lost the weight by 3.37%, when inoculated with AF. When AF and PC were inoculated separately on silk fibers, tensile strength decreased by 76.3% and 56.4%, respectively, with concommitang increases in elingation by 53.1% and 37.8% respectively. The silk was damaged more severely by AF than PC, when they were observed by scanning electron microscope.

• Food Science and Preservation
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• v.7 no.1
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• pp.63-67
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• 2000

Changes in the compressive strength of four typical corrugating mediums (K$_2$A, AS and S) as affected by relative humidity conditions were compared and their relative cost effectiveness was analysed. All mediums lost their compressive strength as relative humidity increased. at the relative humidity of 93% , As medium lost 58% of its initial strength while S medium did about 40%. Calculations of compress factor and compress factor by price indicated that $K_2$ medium was the most cost effective and maintained the highest compressive strength among the mediums tested. It was recommended that $K_2$ medium could be effectively used to make corrugated fiberboard especially for fresh agricultural product packaging .