• Journal of Chest Surgery
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• v.31 no.1
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• pp.1-6
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• 1998

Total body water is increased after cardiopulmonary bypass resulting in tissue edema and organ dysfunction. Ultrafiltration has been used to reduce this accumulation of water. We have carried out a prospective randomized study in 17 children undergoing open heart surgery, comparing modified ultrafiltration(MUF) with nonfiltered controls. MUF was carried out for about 10 minutes after completion of cardiopulmonary bypass to a hematocrit 36∼42%. Blood loss, blood transfused, hemodynamics, and laboratory data were recorded for 24 hours postoperatively. The results were analyzed using Mann-Whitney U test, comparing controls(n=7) to ultrafiltered(n=10). There was no death in each group. The mean filtrate volume(ml/kg) was 42(30∼68). Blood loss(ml/kg/24hr) was 14.5 mean(4.0∼26.6) in controls versus 12.1 mean(6.0∼21.5) in MUF(P＞0.05) ; blood transfused(ml/kg/24hr) was 9.4 mean (6.0∼36.3) in controls versus 3.4 mean(0∼11.4) in MUF(P<0.05). There was rise in arterial blood pressure during MUF. Percent rise of systolic blood pressure was 4.2(0∼11.7) in controls versus 19.8(7.0∼36.9) in MUF(P=0.001). Percent rise of diastolic blood pressure was 10.0(1.6∼20.8) in controls versus 30.6(5.8∼73.3) in MUF(P<0.05). Platelet count, fibrinogen, and oncotic pressure rose after MUF. No complications directly attributable to the ultrafiltration were observed. Conclusively, MUF is safe, effective means of removing body water and beneficial to hemodynamics.

• Journal of the Korea Convergence Society
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• v.13 no.4
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• pp.573-582
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• 2022

In order to develop samultang with reduced side effects, modified samultang using omija was oral administered to rats with ovarian resection, and changes in evaluation indicators of functional efficacy in women's menopause were measured. In weight gain, relative weight of uterus and vagina, blood lipid-related indicators, and changes in blood estradiol, there was no statistically significant improvement effect in modified Samultang compared to the control group. However, the expression of estrogen receptor alpha and beta in intrauterine tissue tended to increase, and the expression of phosphorylated ERK, which is known to be involved in estrogen receptor signaling, showed a significant increase in activation in ERK and AKT. The expression amount of phosphorylation AKT was not significant, but showed an increasing tendency. Even though the test substance was administered in a relatively small dose, it is judged that the test substance modified Samultang has the ability to activate estrogen receptor. In the future, it is expected that it can be used as a useful natural mixture to show the efficacy of samultang with fewer gastrointestinal disorders.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.28 no.6
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• pp.699-706
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• 2015

This paper presents results of one-year monitoring on prestressing force of a 7-wire steel post-tensioning strand which is installed in a UHPC(ultra high performance concrete) bridge with 11.0 m long, 5.0 m wide, and 0.6 m high by using a FBG-encapsulated 7-wire steel strand. The initial prestressing forces and the prestress changes during a vehicle load test were measured using the FBG-encapsulated strand. The results show that the FBG-encapsulated 7-wire strand is very effective for monitoring the prestress forces even the change in the tension force is very small. Additionally, it was indicated that selection of the thermal expansion coefficient which is used for the temperature correction shall be carefully carried out.

• Journal of Chest Surgery
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• v.41 no.5
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• pp.671-674
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• 2008

Jejunum and fasciocutaneous and myocutaneous flaps are theoretically recommended as esophageal substitutes in reconstruction of the esophagus after several occurrences of failed reconstruction. However, other esophageal substitutes should also be considered. Secondary esophageal reconstruction was successfully performed on a 24-year-old woman who had a history of cervical, thoracic, and abdominal operations and esophageal stricture secondary to several failed reconstructions for esophageal atresia and tracheo-esophageal fistula 21 years prior. The esophageal reconstruction was done subcutaneously by end-to-side anastomosis at the left cervical area using a deformed stomach graft. The patient was discharged with the ability to consume a regular diet after the operation.

• Geotechnical Engineering
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• v.14 no.1
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• pp.5-14
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• 1998

In refuse landfill, long-term settlement is considerably dependent upon the biological decomposition of refuse which is distinguished from typical soil behavior. Two equations are combined in order to model long-term settlement behavior of refuse landfill caused by mechanical secondary compression and secondary compression caused by the decomposition of biolegradable refuse. It is suggested that mechanical secondary compression is linear with respcet to the logarithm of time. In order to estimate the settlement that occurs due. to the decomposition of biodegradable refuse, a mathematical model is used which theoretically conoiders the decomposition process related to the solubilization stage of biodegradable refuse solid. This model is based on hydrolysis process and expressed as first order kinetics. The proposed model is applied to Lysimeter compression data of an old refuse. This paper intends to propose the simplest mathematical model which effectively represents settlement caused by the solubilization stage of biodegradable refuse solid on decomposition process.

• Journal of the Korea Concrete Institute
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• v.26 no.6
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• pp.707-714
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• 2014

CFT (Concrete-Filled Tube) is a type of steel column comprised of steel tube and concrete. Steel tube holds concrete and the concrete inside tube takes charge of compressive load. This study presents structural performance of the CFT column which has 73~100 MPa high strength concrete inside. Fluidity, mechanical compression, pump pressure test in flexible pipe were conducted for understanding properties of the high strength concrete. Material properties were achieved by various experimental tests, such as slump, slump flow, air content, U-box, O-Lot, L-flow. In addition, mock-up tests were conducted to monitor concrete filling, hydration heat, compressive strength. From construction sites in Sang-am dong and University of Seo-kang, long-term behaviors could be effectively predicted in terms of ACI 209 material model considering elastic deformation, shrinkage and creep.

• Journal of the Korean Geosynthetics Society
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• v.6 no.4
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• pp.21-28
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• 2007

3 years visual inspection has been performed on the railway lines where ballast replacement or geosynthetics-reinforcement had been used to restrain the mud pumping. The result indicates that geosynthetics-reinforcement is more effective than ballast replacement for the long-term mud pumping. In addition, the non-woven geotextile to be used for mud pumping restraint is effective when its weight is $330N/m^2$ or above. Furthermore, the lateral tensile strain under ballast on which wheel load applies ranges from 0.016 to 0.1211% and it's 10 times larger than the lateral tensile strain which ranges from 0.0078 to 0.0385%.

• Journal of Korean Society of Forest Science
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• v.87 no.1
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• pp.40-49
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• 1998

This study aimed to provide a strategy for selecting an adequate combination of growth intervals(i.e. times between age $T_1$ and age $T_2$) to be used to improve the reality of the growth equation through obtaining better precision of parameter estimates. Variety of growth functions were fitted to the data and one equation which best fitted the data was chosen for the analysis. A modified Schumacher projection equation, selected as a best equation, that included dummy variables representing locality as a predictor variable was fitted for basal area and height equations with nonoverlapping growth interval and all possible growth interval data sets of Douglas-fir(Pseudotsuga menziesii Mirb.Franco). The data were measured in all parts of the South Island of New Zealand. It was found that the precision of parameter estimates was increased in both basal area and height equations by using data set which contained a range of measurement intervals from short to long term.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.653-656
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• 2008

As super.high.strength concrete uses a large amount of binder, there is an autogenous shrinkage strain larger than dry shrinkage and it degrades the quality of structures. Thus, we need a technology to minimize the shrinkage strain of super.high.strength concrete. Accordingly, the present study prepared super.high strength concrete with design strength of over 80MPa and, using an embedded gauge, measured the shrinkage strain of free shrinkage specimens for super.high.strength concrete containing expansion agent. According to the results of this study, the expansion rate of concrete increased in the early stage due to the admixture of expansion agent, but the shrinkage rate went down with the lapse of time. The effect of the admixture of expansion agent on compressive strength appeared insignificant. Further research shall be made on different kinds of expansion agents and various mixture ratios for basic analysis to reduce autogenous shrinkage of super.high.strength concrete.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.27 no.1
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• pp.66-70
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• 2005

Cupid's bow, upper lip, columella, and ala of nose are esthetically important, in which their symmetrical plasties determine success or failure of the surgery in cleft lip and palate patients. Z-palsty and its modifications are simple and effective. The double Z-plasty is economical in surgical time and esthetics in reconstructing the cupid's bow compared with other methods. We report a 29-year-old male patient who represented reversed cupid's bow and whistle deformity after the primary repair of the cleft lip. He was corrected the cupid's bow using a double Z-plasty. The reversed cupid's bow was corrected to a normal shape and the whistle deformity disappeared. The tightness of the upper lip was relieved after the operation. The double Z-plasty was esthetically successful because the procedure was limited in the vermilion and did not produce a new scar on the skin. Furthermore, the lip tubercle became protuberant. The cupid's bow was symmetrically smoothly curved at 4 years after the operation. These results indicate that the double Z-plasty is simple, less traumatic to the surrounding tissues, and suitable for the correction of whistle deformity.