• Proceedings of the Korea Concrete Institute Conference
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• 2000.04a
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• pp.745-750
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• 2000

Steel plate bonding technique is most widely used in strengthening of existing concrete structures, but it has inherently a problem of the premature failure such as interface separation and rip off. So far, many studies have been arid out in the manner of laboratory tests for the reinforced concrete beams to find out he mechanism of the premature failure. However, in order to verify the characteristics of the premature failure, more reasonable local investigations are needed rather than such relatively global experimental works. In this study, therefore, the double lap test which simulate the pure shear loadings and the half beam tests which consider combined flexure-shear force have been done. There are, however, difficulties in getting the normal stress caused to premature failure, so that finite element analysis was performed, too. In numerical study, material nonlinearity was considered, and the interface element was applied to model the interface between steel plate and adhesive. From the results of experimental and numerical studies, a realistic failure criterion on the separation of steel plates has been derived.

• Journal of the Korea institute for structural maintenance and inspection
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• v.9 no.1
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• pp.283-292
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• 2005

This paper predicts premature failure load of reinforced concrete beams by epoxy-boned partially steel plates. A parametric study is conducted to estimate premature failure load of beams such as with or without stirrups, unplated length ratio, steel and reinforcement ratio, shear span to depth ratio of reinforcement beam. By results of finite element analysis, it turned out that the unplated length played a dominant role in partially plated beams but reinforcement ratio and shear span to depth ratio effected the premature failure load. The approximate expression with regard to combined design variables is compared with experimental results. It shows closely agreement.

• The Journal of Korean Obstetrics and Gynecology
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• v.27 no.3
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• pp.135-142
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• 2014

Objectives: The purpose of this study is to report the effects of herbal medicine on infertility caused by premature ovarian failure. Methods: The patient in this case was 38-year-old female. The patient was diagnosed premature ovarian failure by serum hormone assay. The chief complain is amenorrhea and infertility. She was treated by traditional treatment, such as herbal medicine (Buickjihwang-hwan), acupuncture and moxibustion. Results: After the treatment, the patient recovered the menstrual cycle and became pregnancy and delivery. Conclusions: This case shows that traditional Korean treatment might be effective in infertility caused by premature ovarian failure.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 2003.11a
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• pp.395-401
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• 2003

In this paper, the dent printing phenomena and critical dent size which lead to premature failure of deep grooved ball bearing for automobiles are presented. The results of newly assembled test bearings showed that the ball dent size strongly affect the bearing life and inner ring raceways were the major failed parts in spite of using the dented balls. The dent printing phenomena are a root cause of premature failure, which was not reported until now. And there exist the critical ball dent size for given rolling bearings and operating conditions. So, the initial condition of tribologically mating parts should be treated as important as the failed body itself.

• Development and Reproduction
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• v.15 no.4
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• pp.309-313
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• 2011

SOHLH2 is a novel germ cell-specific transcription factor that is crucial for folliculogenesis in the ovary and spermatogenesis in the testis. SOHLH2 represents a candidate gene for infertility with premature ovarian failure. We analyzed whether mutations in the SOHLH2 gene in 98 Korean women with premature ovarian failure. The sequence analysis identified six novel SNPs (c.431-41G>C, c.656A>T, c.1000+27C>T, c.1000+33G>T, c1258-106G>A, and c.2094+ 11T>C) from Korean patients with premature ovarian failure. The c.656A>T found in exon 7 results in change of an amino acid, tyrosine to phenylalanine. Functional mutations in SOHLH2 gene are rare in Korean women with premature ovarian failure.

• The Journal of Korean Obstetrics and Gynecology
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• v.24 no.2
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• pp.134-141
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• 2011

Objectives: The purpose of this study is to asses the effects of oriental medicine on premature ovarian failure. Methods: The patient in this case was 30-year-old female. The chief complain is oligomenorrhea. By serum hormone assay and history interview, we diagnosed premature ovarian failure. She was treated by oriental treatments, such as herbal medicine and acupuncture. And then we estimated the results of treatment by follow-up measurements of serum hormone level. Results: After treatments, symptoms of premature ovarian failure was improved, level of serum gonadotropin decreased and level of serum $E_2$ increased. We confirmed the improvement of case by follow-up measurements of serum hormone level. Conclusions: This results of serum hormone assay showed how medically effective oriental treatments of premature ovarian failure.

• Proceedings of the Korea Concrete Institute Conference
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• 1998.04b
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• pp.585-591
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• 1998

In the case of reinforced concrete beams strengthening by steel plate, sometimes these beams collapse due to the stress concentration at the ends of steel plates before the design expected failure. This kind of failure is called premature failure. This study analyzes the behavior of strengthened RC beams to control premature failure of these plated beams with either changing the geometries at the ends of plates or strengthening steel plates beside the ends. The results from the former cases show that, the effect of expanded plates sections at the ends was very small, and the beams which are rounded the ends of plates effectively increased the initial rip-off loads about 14% compared with control beam but the ultimate loads was almost same. However, the beams in the latter cases effectively increased the initial and the ultimate rip-off loads with changing failure mode, especially around 14~19% in the ultimate rip-off load comparing with control beam.

• The Journal of Korean Obstetrics and Gynecology
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• v.31 no.2
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• pp.113-122
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• 2018

Purpose: To report the effect of Korean medical treatments on 1 patient with secondary amenorrhea after ovarian surgery for bilateral endometriomas diagnosed as premature ovarian failure. Methods: The patient who had secondary amenorrhea was treated with Korean medical treatments such as herbal medication, herbal acupuncture and moxibustion therapy, and so forth. Results: After the Korean medical treatments, the patient could have her periods again. And high FSH level was decreased to normal. Conclusions: The case report shows that Korean medical treatment can be an effective option for treating secondary amenorrhea after ovarian surgery for bilateral endometriomas diagnosed as premature ovarian failure.

• Computers and Concrete
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• v.4 no.2
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• pp.119-134
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• 2007

External bonding of steel or FRP plates to reinforced concrete (RC) structures has been a popular method for strengthening RC structures; however, unexpected premature failure often occurs due to debonding between the concrete and the epoxy. We proposed a Coulomb criterion with a constant failure surface as the debonding failure criterion for the concrete-epoxy interface. Diagonal shear bonding tests were conducted to determine the debonding properties that were related to the failure criterion, such as the angle of internal friction and the coefficient of cohesion. In addition, an interface element that utilized the Coulomb criterion was implemented in a nonlinear finite element analysis program to simulate debonding failure behavior. Experimental studies and numerical analysies on RC beams strengthened by an externally bonded steel or FRP plate were used to determine the range of the coefficient of cohesion. The results that were presented prove that premature failure loads of strengthened RC beams can be predicted with using the bonding properties and the finite element program with including the proposed Coulomb criterion.

• The Journal of Korean Obstetrics and Gynecology
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• v.15 no.4
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• pp.193-201
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• 2002

Purpose : Premature ovarian failure, characterized by amenorrhea or oligomenorrhea, estrogen defieciency and elevated gonadotropins in woman less than 40 years of age, affects approximately 1% of woman and is associated with autoimmune phenomena or genetic abnormalities, but mostly idiopathic. This disease is loss of ovarian function seems not to be always permenent. Method : We investigated herb medication was effective in patient of premature ovarian failure. Results: Signs and symtoms of estrogen deficiency were improved and mensturation occurred monthly and the elevated during treatment of herb medication. As a result of our case recovering of ovarian function, we hope more investigtions about treating premature ovarian failure by oriental medicine will be gained.