• Journal of the Korean Society of Physical Medicine
• /
• v.6 no.2
• /
• pp.165-175
• /
• 2011

Purpose: This study examined the effect of the strengthening exercise and stretching exercise to decrease symptom patellofemoral pain syndrome (PFPS). Methods: The Anterior Knee Pain Scale (AKPS) and Clark's test performed for diagnosis of intrinsic PFPS among young adults. Selected thirty young adults subjects who aged 20~26 years participated in the study. Participants were randomly assigned to strengthening, stretching, or control groups. Strengthening group consisted of quadriceps, hamstring and iliotibia band training used elastic band. Stretching group consisted of quadriceps, hamstring and iliotibia band trainings used stretching exercises program. Participants received 50-minute individualized exercise sessions, 3 times a week for 6 weeks. Results: The results were as follow: there were significantly difference stretching exercise group by all muscles on muscular strength test (p<.05). there were significantly difference both strengthening and stretching exercise group by all muscles on flexibility test (p<.05). There were significantly difference stretching exercise group by all muscles on step-down test (p<.05). There were significantly difference both strengthening and stretching exercise group by all muscles on visual analog scale (p<.05). Conclusion: Results suggest important implications for exercise programs of PFPS that stretching exercise is more improved knee pain, functional performance, patella mobility than strengthening exercise.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.26 no.7
• /
• pp.858-863
• /
• 2020

We experimented with the particle-settling velocity and CHCl3 absorption efficiency of seven activated-carbon and analyzed seven heavy metal contents by elution for application to the field treatment of sunken HNS on the marine seabed. The mean particle-settling velocity was in the range 0.5-8 cm/s, except when the 8-20 mesh was used. The larger the HNS particle, the faster the particle-settling velocity was, and the CHCl3 absorption efficiency increased considerably owing to the larger surface area. In addition, the elution test results showed that the total Zn and As contents in >100-meshed activated carbon was higher than the contents criteria for the standard for water-treatment agents, and Cr, Zn, and As were released at higher concentrations than those released by other activated-carbon groups. Taken together, the CHCl3 absorption efficiency, settling velocity, and elution test results suggested that the 20-60, 20-40, and 2mm&down mesh activated-carbon adsorbents could be applied to the field treatment of HNSs and that the minimum required amount for field treatment were 0.82, 0.90, and 1.28 ton/㎘, respectively, as calculated based on the HNS-adsorption-capacity priority.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.32 no.4
• /
• pp.369-375
• /
• 2012

In order to overcome the detection limit by the current nondestructive evaluation technology, a nonlinear resonant ultrasound spectroscopy(NRUS) technique was applied for detection of micro-scale cracks in a material. A down-shift of the resonance frequency and a variation of normalized amplitude of the resonance pattern were suggested as the nonlinear parameter for detection of micro-scale cracks in a materials. A natural-like crack were produced in a standard compact tension(CT) specimen by a low cycle fatigue test and the resonance patterns were acquired in each fatigue step. As the exciting voltage increases, a down-shift of resonance frequency were increases as well as the normalized amplitude decrease. This nonlinear effects were significant and even greater in the cracked specimen, but not observed in a intact specimen.

• Journal of Korean Academy of Nursing
• /
• v.25 no.3
• /
• pp.549-561
• /
• 1995

This study was designed to identify the relation-ship of perceived social support on self-esteem and hopelessness in patients with chronic renal failure who are hemodialysis. The subjects of this study were the 50 patients who were registered in the hemodialysis department of the two hospitals. The data were collected using a questionnaire and The period of the data collection was from August 9 to 16, 1993. The instruments for this study were the perceived social support scale designed by Park Ji-Won, the self -esteem scale designed by Rosenberg and the hopelessness scale designed by Beck et al. The data were analyzed using frequencies, percentages, t-test, ANOVA, and .Pearson correlation coefficient. The results are summarized as follows ; 1. The degree of support according to the type of perceived social support ranged down in the fol-lowing order from high to low the mean emotion-al support 21.12, the mean informational support 19.58, the mean appraisal support 17.00, the mean material support 15.22, the man self-esteem was 32.00 and the mean hopelessness was 60.48. 2. Test for hypothesis ; Hypothesis 1, "The higher the level of perceived social support in patients on hemodialysis, the higher their level of self-esteem will be. " was not supported(r=.05, p=0.74). Hypothesis 2, "The higher the level of perceived social support in patients on hemodialysis, the lower their level of hopelessness will be. " was supported(r=-0.53, p=0.00). 3. The relations between general characteristics and the level of perceived social support, self-esteem, and hopelessness ; (1) The 'Gender'(P=0.04), 'Occupation'(P=0.04), 'Education'(P=0.00), 'Married state'(P=0.00) 'Duration of Hemodialysis'(P=0.00) and 'In-come'(P=0.00) of the subjects were related to perceived social support and showed a statistically significant difference. (2) No general characteristics of the subjects were related self-esteem in a statistically significant way. (3) The 'Education'(P=0.00) , 'Income'(P=0.00) of the subjects were related to hopelessness and showed a statistically significant difference. Thus, it is concluded that social support must be included in nursing interventions for patients with chronic renal failure on hemodialysis.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.51 no.1
• /
• pp.146-153
• /
• 2015

A model net experiment of the gape net for anchovy in Jindo, Jeollanam-do was carried out to investigate the net shape and hydrodynamic resistance using circulating water channel. The model net was made 1/33 down scale by Tauti's similarity method and the range of experimental current speed was from 0.5 knot to 3.5 knot (increasing 0.5 knot interval). The net mouth height in 0.5 knot of the minimum experiment current speed was shown 26.0 cm (full-scale conversion value 8.58 m). The net mouth height and mouth area in 1.5 knot of the same current speed with a gape net fishing ground were shown 20.0 cm (full-scale conversion value : 6.60 m) and about $507.9cm^2$ (full-scale conversion value : $55.31m^2$). The net mouth height and area were decreased with increase the experimental current speed. The hydrodynamic resistance of the model net in 1.5 knot current speed was shown 1.11 kgf and the value of full-scale conversion by Tauti's method was shown 3.996 ton.

• Journal of The Korean Society of Integrative Medicine
• /
• v.7 no.4
• /
• pp.53-59
• /
• 2019

Purpose : The purpose of this study was to determine the influence of the elastic-band exercise program for elderly who over 65 years old in terms of depression and physical self efficacy. We aim to suggest interventions with an elastic-band exercise program for elderly. Methods : The study subjects selected were females or males 65 years old or more who could walk without assistance and could talk about daily living without mental or physical disorders. A total of eight subjects understood the purpose of this study and agreed to participate. Before and after the exercise program, the subjects were monitored for changes in their physical self-efficacy and depression. To measure the physical self-efficacy, we used a perceived physical ability scale and physical self-presentation confidence scale (Cronbach α =0.942). To measure depression, we used the geriatric depression scale short form (Korea version, Cronbach α =0.969). The data obtained from each measure were analyzed using the Wilcoxon signed rank test to determine changes from before and after the exercise program. The program consisted of three parts (warm-up, main exercise and cool-down) and included the upper extremities, the lower extremities and trunk exercises with an elastic band (yellow and red). The program lasted for 15 weeks, once a week, with each session lasting for 60 minutes. Results : After 15 weeks of the elastic-band exercise program, there was a significant decrease on the depression scale (p<0.05) and significant improvements on the physical self-efficacy scale (p<0.05). Conclusion : Based upon our results, we demonstrated that the exercise program using the elastic band was effective in improving the depression and physical self-efficacy of the elderly.

• Journal of Korean Society of Coastal and Ocean Engineers
• /
• v.34 no.1
• /
• pp.1-10
• /
• 2022

In this study, the two horizontal shroud tidal current energy converter, which can generate power even under low flow speed conditions, was developed. In order to determine the shape of the shroud system, a three-dimensional numerical simulation test was conducted, and a 1/6 scale down model was made to perform a hydraulic model experiment. The hydraulic model experiment was performed under four flow conditions, and the flow speed, torque, and RPM were measured for each experimental case. As a result of the numerical simulation test, it was found that the flow speeds passing through the nozzle were increased by about 2~3 times in the cylinder, and when the extension ratio was 2:1, the highest flow speed was shown. In addition, it was found that the flow speeds increased 2.8 times when the diameter ratio between the nozzle and the cylinder was 1.5:1. Meanwhile, as a result of the hydraulic model experiment, it was found that when the tip speed ratio was between 1.75 and 2, the power coefficient was 0.32 to 0.34.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
• /
• v.17 no.11
• /
• pp.1050-1059
• /
• 2005

Heat and $SF_6$ gas dispersions over a complex terrain were investigated using wind tunnel. The wind speed, temperature and concentration profiles were measured for the 1/1000 scale complicated terrain model in an Eiffel type boundary layer wind tunnel with test section of 2.5m in height and 4.5m in width. The scale model was mounted on the top of a plate which can rotate with respect to the approaching wind. Dispersion processes from a continuous emission source driven by various wind direction were investigated, including plume climbing over the steep up-slope of the mountain and down-spreading toward the lower level of the valley. Extensive dispersion experiment data (wind speeds and concentration profiles) were provided for verification and validation of dispersion models. Under the identical flow and emission conditions, the independently measured profiles of the temperature and $SF_6$ concentration showed an excellent agreement which ensured the credibility of the results.

• Proceedings of the Korean Geotechical Society Conference
• /
• 1999.10a
• /
• pp.405-414
• /
• 1999

The auger and screw piles have known an important evolution during the last decade. Besides the large success of augercast (CFA) piling systems, new systems have been developed combining, to a variable extent, the classical extraction auger with especially designed displacement tools in order to develop screw piles with partial or total lateral soil displacement. These last developments cover the whole range of lateral soil displacement and are more difficult than ever to compare. The authors present the latest evolutions in auger piling systems and compare them with respect to penetration performances, bearing capacities and amount of spoil generated. A special focus is given to a new efficient system: the OMEGA(H) pile in use in Korea since 1997. The results of the Hongcheon site are presented where this R system was applied for a new investment of the Korean National Housing Corporation (KNHC). This first important experience, with the execution of some 1,500 Omega piles with diameter 410 mm, is presented. The piles were installed through loose silty sands down to very dense sands and layers of gravel. The results of full-scale load tests are analysed and show the conformity with requirements of the clients.

• Journal of Korean Foot and Ankle Society
• /
• v.13 no.1
• /
• pp.23-27
• /
• 2009

Purpose: The purpose of this study was to evaluate the clinical outcome of neglected Achilles tendon rupture treated with reconstruction and augmentation with flexor hallucis longus (FHL) tendon using one incision technique. Materials and Methods: Between July 2006 and March 2008, eleven patients with neglected Achilles tendon rupture received surgical treatment. Through one incision technique, augmentation with auto FHL tendon transfer was performed using a Bio-Interference screw (Arthrex, Naples, FL) and followed by V-Y advancement (5 cases) or gastronemius fascial turn-down flap procedure (6 cases). After mean follow up of 20.7 months (range, 11.8-33.3 weeks), clinical outcomes were evaluated with Visual Analogue Scale (VAS), American Orthopedic Foot and Ankle Society (AOFAS) score, 10 repetitive double heel raise test, 10 repetitive single heel raise test and subjective satisfaction. Results: The length of the gap after debridement was $5.4{\pm}2.0$ cm. The VAS improved from $4.1{\pm}0.9$ to $1.5{\pm}0.8$ at last follow up (p<0.05). The AOFAS score increased from $38.9{\pm}12.2$ to $91.5{\pm}8.9$ at last follow up (p<0.05). Eight patients were satisfied with excellent results and three were satisfied with good results. All patients were able to perform 10 repetitive double heel raise and nine out of eleven patients were able to perform 10 repetitive single heel raise at last follow up. There were no complications including deep infection or re-rupture. Conclusion: Augmentation with FHL tendon transfer and reconstruction with V-Y advancement or turn-down flap through one incision technique appeared to be effective and safe. This technique is recommendable for the treatment of neglected Achilles tendon rupture.