• Korean journal of food and cookery science
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• v.12 no.4
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• pp.571-576
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• 1996

The moisture-dependent gelation characteristics of five different proteins are evaluated to understand the modification of gel strength when they are added in surimi gel. Compressive force and penetration force of protein gels gradually decreased with increase of moisture level, with showing markedly decrease at certain point of moisture level called critical moisture level. The critical moisture level for gelation of SPI-1, SPI-2, EW, WPC and LA were 79.4%, 81.6%, 91.4％, 87,8% and 84.7%, respectively. Beyond this critical level of water, protein gel matrix begins to lose its water binding and structural integrity. The mnisture that was not re tained by a protein was available to diluting the protein matrix and eventually weakened the overall gel strength. EW and MPI showed higher water retention than those of SPI, WPC and LA. The compressive force of SPI, WPC and LA-incorporated surimi gel at the varying moisture levels strongly correlated with the amount if water retained at corresponding moisture level within those protein (r=0.99).

• International Journal of Concrete Structures and Materials
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• v.4 no.2
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• pp.89-96
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• 2010

This paper focuses on the effect of creep on the critical compressive strain (CCS) of concrete. The strain of concrete corresponding to the peak compressive stress is crucial in the selection of the ultimate yield strength of the reinforcing bar used in reinforced concrete columns. Among the various influencing factors, such as the creep, shrinkage, loading rate and confinement, the effect of creep and shrinkage is the most significant. So far, investigations into how these factors can affect the CCS of concrete have been rare. Therefore, to investigate the effect of creep and shrinkage on CCS, an experimental (part I) and a parametric study (part II) were conducted, as presented in these papers (part I considers creep effect, part II considers effect of creep and shrinkage). In part I, experiments pertaining to the loading age, loading rate, loading duration and loading and creep levels were conducted to study the effect of these variables on the CCS of concrete. It was found that the effects of the loading rate, loading age, and level and duration on the CCS of concrete were negligible. However, it is very important to consider the effect of creep.

• Environmental and Resource Economics Review
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• v.27 no.2
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• pp.363-397
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• 2018

We study the impact of loss-aversion and the threat of critical damages from insufficient pollutant abatement, which we jointly call threshold concerns, on the outcome of international environmental agreements. We aim to understand whether concerns for a critical level of damages induce cooperation among countries faced with the well-known free-riding problem, and yield sufficient emission reductions to avoid exceeding the threshold. Specifically, we focus on loss-averse countries negotiating under the threat of either high or low environmental damages. Under symmetry, when countries display identical degrees of threshold concern, we show that such beliefs have a positive effect on reducing the emission levels of both signatories to the treaty and non-signatories, leading to weakly larger coalitions of signatories than in the absence of reference dependence. We then introduce asymmetry, by allowing countries to differ in the degree of concern about the damages. We show that stable coalitions are mostly formed by the countries with higher threshold concerns. When enough countries exhibit standard preferences, the coalition size may diminish, regardless of the degree of concern by the others.

• The Journal of Dong Guk Oriental Medicine
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• v.1
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• pp.15-54
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• 1992

The present study was accomplished to investigate the relation between menstrual cycle and ovulation by studying the fluctuation of FSH, LH, estrogen and progesterone concentration in serum samples of selected senior high school women with normal and delayed menstrual cycles after administration of Jokyungijongoktang which was a widely used herb medicine for controlling abnormal menstrual cycles. The obtained results were summarized as follows : 1. There was a significant increase of FSH concentration in women with delayed menstrual cycles after administration of Jokyungjongoktang during the preovulatory phase. 2. Jokyungiongoktang produced a significant elevation od LH concentration in women with normal and delayed menstrual cycles, respectively, during the critical interval of ovulation. 3. Estrogen concentration was significantly decreased in women with delayed menstrual cycles after administration of Jokyungjongoktang during the critical interval of ovulation. 4. Peogesterone concentration significantly increase in women with delayed menstrual cycles after administration of Jokyungjongoktang, respectively, during the postovulatory phase. According to the above results, it can be considered that Jokyungjongoktang restore menstruation and pregnancy-related hormones to normal serum levels of women with normal menstrual cycles by activating maturation of ovum and action of estrogen during the preovulatory phase, ovulation and progesterone synthesis during the critical interval of ovulation, and nidation and endometrium sufficient for the continued pregnacy during the postovulatory phase in women with delayed menstrual cycles.

• The KSFM Journal of Fluid Machinery
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• v.13 no.3
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• pp.43-48
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• 2010

In this study rotordynamic characteristics of an air turbo-compressor (ATC) used in oxygen plant are analyzed and its operating-speed balancing is performed to solve the vibration trouble caused by rotor unbalance. Three dimensional model of the ATC rotor is completed and then analytical FE (finite element) model, which is verified by experimental modal testing, is developed. A rotordynamic analysis includes the critical map, Campbell diagram, and unbalance response, especially considering the pedestal housings supporting tilting pad bearings. A test run of operating-speed, using tilting-pad bearing of actual use, showed that the vibration level increased very sharply as approaching the rated speed. The operating-speed balancing specified by API 684 was carried out by using influence coefficient method. The results showed that the vibrations at the bearing pedestal housings represented good levels of 0.1 mm/s. From the test run and operating-speed balancing, the analytical results, that is, critical speeds are in good agreement with the test results and unbalance responses introducing the correction masses are similar to the as-is test responses in its aspect.

• The Korean Journal of Food And Nutrition
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• v.29 no.6
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• pp.829-834
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• 2016

Free radicals originate due to the radiolysis of cytoplasmic water with low "Linear Energy Transfer" (LET) radiations. Naringenin (Ng) is a natural antioxidative compound found in citrus fruits. This study revealed that Naringenin (Ng) reduced the radiation damage of critical organs by scavenging oxidative free radicals. In the study, Ng was orally administrated to rats daily for 7 consecutive days, prior to whole body exposure to gamma-rays. The scavenging efficacy was evaluated biochemically by measuring the concentration of cytotoxic byproducts and the activity of enzymes relevant to oxidative free radicals, after extracting the organs from the exposed rat. We observed increased levels of malondialdehyde (MDA) concentration, and decrease in the activities of superoxide dismutase (SOD) and catalase (CAT) in the exposed control group. However, pretreatment with Ng significantly reduced the MDA concentration, and increased the activities of SOD and CAT, as compared to the control group, due to the free radical scavenging by Ng. The results indicate that Ng administration prior to irradiation could protect critical organs from radiation damage.

• Journal of Korean Clinical Nursing Research
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• v.21 no.3
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• pp.401-411
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• 2015

Purpose: This study was performed to develop a valid and reliable Korean Patient Classification System for Critical Care Nurses (KPCSC). Methods: Tertiary and general hospitals with various levels of ICU nurse staffing were included. To verify interrater reliability, data collectors and staff nurses of 15 ICUs in 11 hospitals classified 262 patients. To verify construct validity, the staff nurses classified 457 patients according to KPCSC comparing difference by medical department and type of stay in ICU. For conversion index, 195 patients from 10 ICUs in 7 hospitals were classified and nursing time was measured by 174 nurses, 7 head nurses, 18 charge nurses, 37 nurse aids and 1 secretary. Results: The developed KPCSC has 11 categories, 82 nursing activities and 115 criterias. Reliability was found to have high agreement (r=.96). Construct validity was verified by comparing differences in medical department and type of stay in ICU. According to scores, four groups in the KPCSC were identified. One score on the KPCSC indicates 6.12 minutes of nursing time. Conclusion: The findings show that the KPCSC can be used to measure new and complex nursing demands including rehabilitation and the safety of ICU patients.

• Journal of Korean Critical Care Nursing
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• v.2 no.1
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• pp.1-14
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• 2009

Purpose: This study was designed to identify levels of job stress and assertiveness behaviors and the relationship between them among ICU nurses. Methods: A correlational descriptive survey was used to these relationships among 454 ICU nurses from 25 hospitals which were members of Korean Association of Critical Care Nurses. Data were collected using a structured questionnaire which included 58 items of job stress and assertiveness scale from November 4 to 14, 2008. Descriptive statistics, Pearson correlation coefficients were used to analyze the data. Results: ICU nurses experience mild to moderate degree of job stress, A score of assertiveness behaviors was 2.86. There was a negative relationship between job stress and assertiveness behaviors(r=-.106, p=.024) as influenced by role conflict, lack of professional knowledge and skills, and inappropriate treatment. Conclusion: ICU nurses, especially nurses with 3-6 year clinical experience, are in need of support to manage their job stress. These nurses should be supported through provision of adequate stress management and assertiveness program.

• Structural Engineering and Mechanics
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• v.76 no.4
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• pp.491-503
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• 2020

This study extends previous experimental research on the shear behaviour of macrosynthetic fibre-reinforced concrete beams and compares them to steel fibre-reinforced concrete beams with similar mechanical and geometrical properties. This work employed two fibre types: 60/0.9 (long/diameter) double hooked-end steel fibre and 60/85 monofilament polypropylene fibre. Beams were tested by shear loading covering parameters, such as two different cross-section widths, two shear-span-to-effective-depth ratios, two fibre types and using repetitions with and without transverse reinforcement. For quantitative comparison purposes, crack pattern evolution was studied along increasing loads levels. Effects were studied by photogrammetry, including influence of fibres on crack propagation in uncracked and dowel zones, influence of fibres on stirrup behaviour, and shear deformation or kinematics of critical shear cracks. The results evidenced similar effectiveness for both fibre types in controlling shear crack propagation and horizontal dowel cracking. Both fibres provided similar shear ductility and shear deflections. Consequently, the authors confirm that residual flexural tensile strengths are a convenient parameter for characterising the shear behaviour of fibre-reinforced concrete beams.

• Journal of Korean Critical Care Nursing
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• v.15 no.3
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• pp.62-74
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• 2022

Purpose : This study aimed to identify the factors influencing physical restraint-related practice among nurses working in the intensive care unit (ICU). Methods : The participants consisted of 169 ICU nurses in three general hospitals in B and U cities. Data were collected from December 2021 to January 2022 through a structured self-administered questionnaire. Demographic characteristics, physical restraint-related practice, Person-centered Critical Care Nursing (PCCN), work environment, and attitudes toward physical restraint use were measured. For data analyses, hierarchical multiple regressions were conducted using SPSS/WIN 25.0. Results : Clinical careers in the ICU, better work environments, higher PCCN levels, and more positive attitudes toward physical restraint use were associated with a better practice of physical restraints, which together explained 35.5% of the total variance of the outcome. Conclusion : Our findings suggest that to promote a safe physical restraint-related practice among ICU nurses, it is important to improve the nursing environment, prepare guidelines for applying PCCN, and provide education for endorsing positive attitudes toward the use of physical restraints.