• The Journal of Korean Academy of Prosthodontics
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• v.34 no.4
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• pp.816-822
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• 1996

The purpose of this study was to determine whether there was any difference in the mean porosity of denture base resin cured by microwave energy, when the liquid monomers of denture resin(K-33 : methyl methacrylate for conventional water bath curing or Acron MC : special monomer for microwave curing) and/or the thicknesses of denture base($5{\times}10{\times}60mm\;or\;10{\times}10{\times}60mm$) were varied. The mean porosities of k-33 specimens cured in water bath with two different thicknesses were used as control. The results were as follows : 1. Regardless of specimen thickness, Acron MC cured by microwave energy showed the least mean porosity, followed by K-33 cured by water bath heat, and K-33 cured by microwave energy showed the highest level of mean porosity(P<0.05). 2. In both K-33 and Acron MC cured by microwave energy the mean porosities of 5mm thickness groups were lower than those of 10mm thickness groups(P<0.05). But no significant difference was found in mean porosity between 5mm thickness and 10mm thickness of water bath heat cured groups made of K-33(P>0.05).

• Communications for Statistical Applications and Methods
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• v.5 no.3
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• pp.869-878
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• 1998

In this paper, we propose some jackknife estimators for mean in the exponential model with grouped and censored data. Also, we compare the proposed jackknife estimators to other approximate estimators in terms of the mean square error and bias.

• The Journal of Korean Physical Therapy
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• v.15 no.3
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• pp.166-172
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• 2003

The aim of this study is to present the basic reference data of age and specific gait parameters for comparisons of the gait characteristics depended on amputation length of the Unilateral Trans-Tibial Prostheses. The basic gait parameters were extracted from 10 Adult, and 20 below knee(B/K) patients, 50 to 60 years of age using VICON 512 Motion Analyzer. The results were as follows; 1. The mean Cadence of the above knee(A/K) patients and below knee(B/K) patients were $87.77{\pm}8.64$ steps/min, to $99.84{\pm}11.14$ steps/min.(p<0.05) 2. The mean Walking Speed of the above knee(A/K) patients and below knee(B/K) patients were $0.84{\pm}0.15$ m/s, to $0.96{\pm}0.25$ m/s.(p>0.05) 3. The mean Stride Length of the above knee(A/K) patients and below knee(B/K) patients were $1.14{\pm}0.14\;m$, to $1.14{\pm}0.22m$.(p>0.05) 4. The mean maximal angles of joint on the hip flexion motion for different above knee(A/K) patients and below knee(B/K) patients were $34.75{\pm}10.18_{\circ}$, to $32.32{\pm}6.34_{\circ}$.(p>0.05) 5. The mean maximal angles of joint on the knee flexion motion for different above knee(A/K) patients and below knee(B/K) patients were $66.97{\pm}15.08_{\circ}$, to $52.65{\pm}9.21_{\circ}$. (p<0.05) 6. The mean maximal angles of joint on the ankle dorsi-flexion motion for different above knee(A/K) patients and below knee(B/K) patients were $14.41{\pm}4.82_{\circ}$, to $10.04{\pm}3.49_{\circ}$.(p>0.05) 7. The mean maximal angles of joint on the ankle plantar-flexion motion for different above knee(A/K) patients and below knee(B/K) patients were $5.77{\pm}3.17_{\circ}$, to $2.75{\pm}4.49_{\circ}$.(p>0.05)

• Research in Mathematical Education
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• v.18 no.1
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• pp.31-40
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• 2014

Working with dynamic visual representations can help students-with-computer discover new mathematical ideas. Students translate among multiple representations as a strategy to investigate non-routine problems to explore possible solutions in mathematics classrooms. In this paper, we use the area models as new representations for our secondary students to investigate three problems related to the average speed of a particle. Students show their ideas in the process of investigating arithmetic mean, harmonic mean, and average speed through their created dynamic figures. These figures really utilize dynamic geometry software.

• Communications for Statistical Applications and Methods
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• v.5 no.1
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• pp.231-238
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• 1998

A two stage shrinkage testimator for the mean of an exponential distribution is considered with the assumption that an initial estimate of the mean is available. Mean squared error(MSE) of testimator and its relative efficiency (to usual single sample mean) are briefly reviewed. It is shown that relative efficiency depends only on the ratio of true mean value and its initial estimate.

• The Korean Journal of Emergency Medical Services
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• v.12 no.2
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• pp.5-26
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• 2008

Purpose : This study was performed to develop the curriculum of Emergency Medical technology of College. Method : The authors analyzed curricular of EMT in 12 college in Korea. We conducted the distribution, credit, mean, frequency of liberal arts, majors, teaching profession subject by Kim and Lee(2007). We compared curriculum of knowledge and clinical training courses. Results : The numbers of whole subjects were 59.3 and the number of mean and the credits were 130.8 degree of mean. The numbers of liberal arts were 9.5 number of mean and the credits were 15.5 degree of mean. The numbers of major were 47.5 number of mean and the credits were 111.4 degree of mean. The numbers of teaching profession subject were 1.9 number of mean and the credits were 4 degree of mean. Finally, frequency of curriculum of knowledge and clinical training courses were 57.1% and 42%, respectively. Conclusion : This results will represent curriculum development and will standardize curriculum for EMT collage. in addition, it will make EMT curriculum standardized.

• The Bulletin of The Korean Astronomical Society
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• v.36 no.2
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• pp.103.2-103.2
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• 2011

We measure the degree of polarization of the lunar regolith to map the distributions of the age and the particle size. We use a 12cm refracting telescope with a 2k-square pixel color CCD (R band) and a polarization filter. The angular resolution obtained is 3.02 km/pixel. Our goal is to obtain a map of the lunar particle size distribution on the lunar regolith and then that of the age distribution. Polarization of the light scattered by lunar surface contains information on their mean particle size. The mean particle size of the lunar surface has been decreased by continued micro-meteoroid impact over a long period. One can estimate the age of the lunar surface if the mean particle size is known. Particle sizes can be measured through observations of polarization because the mean particle size is related to the maximum polarization and albedo. The age and the particle size of the lunar regolith can give vital information for the future lunar exploration.

• Journal of The Korean Society of Agricultural Engineers
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• v.58 no.2
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• pp.65-71
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• 2016

The new concept of agricultural water supply potential, which is mean annual turnover rate times unit storage capacity, was introduced for agricultural reservoirs. We investigated characteristics of mean annual turnover rate and unit storage capacity for agricultural reservoirs with storage capacity of over $1million\;m^3$. The curve of agricultural water supply potential represents change in mean annul turnover rate according to change in unit storage capacity. The mean annual turnover rate and unit storage capacity in the reservoirs with high minimum storage ratio are significantly higher than those in the reservoirs with low minimum storage ratio. Most of unstable water supply reservoirs showed low mean annual turnover rate or low unit storage capacity, indicating that mean annual turnover rate may be an index of stability degree for agricultural water use. The reservoirs with mean annual turnover rate of over 2 and unit storage capacity of over 0.8 m may be estimated as the stable water supply zone for 10 frequency dry year. The reservoirs with high agricultural water supply potential can belong to the wide range of stable water supply zone. The results suggest that relation between mean annual turnover rate and unit storage capacity may be used in evaluating stability degree for agricultural water supply in the reservoirs.

• Women's Health Nursing
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• v.1 no.2
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• pp.174-199
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• 1995

This study examined the antenatal care known as Taekyo. The sample consisted of 795 women and 564 men who had be seen in the antenatal care unit, delivery room, or postpartal care unit of general hospitals in Korea between March 20 and April 22, 1995. Data were collected using the "Taekyo questionnaire for childbearing women" and "Taekyo questionnaire for husbands of childbearing women" developed by researchers. Data were self-reported. Data were analyzed using the SPSS PC+ program, and descriptive statistics, T-test, ANOVA, Pearson correlation coefficient were applied. The results of this study were as follows : 1. Encouragement to practice Taekyo was at a relatively high level. Items on Taekyo encouraging behaviors had a mean score of 3.51(33 items 5 point scale). According to the five categories of Taekyo encouraging behaviors, subjects indicated they practice "food intake(mean score 4.02)". "praying(mean score 3.78)", "cumulative virtuous deeds (mean score 3.58)". "mind and body management(mean score 3.47)", "maternal fetal interaction(mean score 3.15)". 2. The childbearing women's practices related to forbidden behaviors by Taekyo were relatively high. Item on forbidden behaviors by Taekyo had a mean score 3.71(43 items 5 point scale). According to the five categories of forbidden behaviors by Taekyo, subjects indicated they practiced "voluntary abstention of drugs(mean score 4.78)," avoiding behaviors(mean score 4.78)," avoiding behaviors(mean score 3.77), "good behaviors(mean score 3.71)", "taboo on fetal death tendency (mean score 3.53)", "taboo on certain intake(mean score 3.47)". 3. The practice score of husbands for childbearing women which related to Taekyo behaviors were relatively high. Item on Taekyo behaviors had a mean score 3.59(33 items 5 point scale). According to the six categories of Taekyo behavior, subjects indicated they practiced "mind and body management(mean score 3.94)", "praying(mean score 3.80)", "support of women’s practice related to Taekyo(mean score 3.66)", "good behaviors(mean score 3.58)", "continency(mean score 3.33)", "paternal fetal interaction (mean score 3.19)". 4. On the childbearing women's perception of Taekyo, most of the subjects(88%) had confidence in the positive effects of Taekyo on Child development. The result showed that the childbearing couples practiced Taekyo behavior relatively often and sincerely and most of the childbearing women had a positive perception of Taekyo's effect on prenatal child development.

• Journal of Environmental Science International
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• v.13 no.2
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• pp.135-141
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• 2004

Drift data from 17 Argo profiling floats in the East Sea are used to understand the mean flow and its variability in the upper portion of the East Sea Proper Water (UESPW) (around 800 m). The flow penetrates into the Ulleung basin (UB) through two paths: an extension of the southward flowing of the North Korean Cold Water along the east coast of Korea and between Ulleung Island and Dok island. Flows at 800 m are observed in the range of from 0.2 to 4.29 cms-1 and the variability in the north of the UB is larger than that in the south of the UB. In the UB, cyclonic flows from 0.3 to 1.6 cms-1 are observed with the bottom topography. We found that the mean kinetic energy (MKE) and the mean eddy kinetic energy (EKE) are 1.3 and 2.1 cm2s-2 respectively.