• 대한치주과학회:학술대회논문집
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• 2004.11a
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• pp.53-53
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• 2004

• The Journal of Korean Physical Therapy
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• v.6 no.1
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• pp.75-84
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• 1994

This study was carried out to know correlation between age and balance performance. factors to effect on balance and prepare the basic data in balance performance evaluation clinically. 180 adults without neurosurgical and orthopedic disability from 20 to 79 years of age participated in this study voluntarily. The subjects performed One Legged Stance Test in five conditions 1) eye open 2) eye close 3) eye open & ear close 4) eye & ear close 5) on sponge. The results of this study were as follows : 1. The mean balance performance time by one legged stance test was 25.97 seconds in eye open, 10.45 seconds in eye close, 23.14 seconds in eye open & ear close, 10.18 seconds in eye & ear close and 23.15 seconds in on sponge. 2. The balance performance declined according to age increasing. 3. The visual factor effected on balance performance greatly. 4. The auditory factor effected less than visual factor on balance performance 5. The compliant surface effected on balance performance in over-fifty age group greatly.

• Korean Journal of Animal Reproduction
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• v.12 no.1
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• pp.42-47
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• 1988

This experiment was carried out to investigate the sex ratio of produced lamb after artificial insemination into the cervix with spermatozoa from the top and bottom portion of ram semen separated by diluting semen a column of protein, and after implantation into the uterus with normal morulae and blastocyst cultured in BMOG-3 and Ham F-10 medium containing H-Y anbibody and complement treated with spleen and testis, respectively. All embryos developed to morulae and blastocyst were cultrued in medium under gas phase of 5% CO2 in air at 37$^{\circ}C$, 24 hrs. Estrus of ewes induced by a MAP vaginal sponge and 750 IU PMSG during the non-breeding season. The result obtained in these experiments were summarized as follows: 1. The ratio of heating, lambing, and prolificacy after artificial inseminatin into the cervix of ewes induced by a MAP vaginal sponge and 750 IU PMSG during the non-breeding season were 100%, 40% and 2.74 heads, respectively. 2. Involving 44 ewes, spermatozoa from the top of the protein column produced 23.1% male and 76.9% female lambs, while spermatozoa from the bottom of the column produced 81.3% male and 18.8% female offspring, respectively. 3. The sex ratio (male-to-female) of progeny produced after implantation with normal morulae and blastocyst cultured in medium containing H-Y antibody and complement treated with spleen and testis were 21.0%, 79.0% and 17.4%, 82.6%, respectively.

• Journal of the Korean Ceramic Society
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• v.36 no.9
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• pp.954-964
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• 1999

The effect of fabrication variables and microstructures on the compressive strength of open cell alumina zirconia and silicon nitride ceramics fabricated by polymeric sponge method was investigated. Bulk density and compressive strength of open cell ceramics were mainly affected by coating characteristics of ceramic slurry on polymeric sponge that controlled a shape thickness and defect of the struts. Sintering temperature was optimized for enhancement of strut strength and compressive strength of open cell ceramics. Relative density and compressive strength behaviors were relatively well matched with the predicted values. Open cell ceramics of lower relative density below 0.1 prepared by first relatively well matched with the predicted values. Open cell ceramics of lower relative density below 0.1 prepared by first coating of ceramic slurry had thin triangular prismatic struts that were often broken or longitudinally cracked. With an application of second coating of slurry shape of struts was transformed into thickner cylindrical one and defects in struts were healed but the relative density increased over 0.2 Open cell zirconia had both the highest bulk density and compressive strength and alumina had the lowest compressive strength while silicon nitrides showed relatively high compressive strength and the lowest density. Based upon the analysis open cell silicon nitride was expected to be one of potential structural ceramics with light weight.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.23 no.7 s.166
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• pp.1155-1163
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• 1999

This study deals with the vibration ride quality for passenger car when running on straight highway at the speed of 70km/h. Ten accelerations were measured at four positions, three axes each at the feet, hip, and head, and one axis at the back. Five seats that have different static sponge stiffness were used, and two subjects were participated. These accelerations were analyzed to produce the ride values such as component ride value and overall ride value. It was hard to see the difference of ride value by the change of sponge stiffness. However we could rank the ride quality by the total vibration exposed to passengers. From the transfer function between the hip and the foot, the fundamental mode was observed to be around 5.8Hz. Also the transfer function between the head and hip was studied. The optimal damping ratio of the seat was calculated according to the seat natural frequency with human weighting filter which makes the optimal damping ratio different from that without weighting filter.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2008.10a
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• pp.109-110
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• 2008

본 연구에서는 신축성이 우수한 친수형 무공 PET필름을 사용해서, 소취성, 보온성 및 투습방수성이 우수한 신발용 소재를 개발하였다. 이상의 목적을 달성하기 위해서 최적 소재의 선정, PET필름의 특성평가, 최적 라미네이팅 공정조건 확립, 첨가제 선정 및 가공조건 확립 등에 대해서 실험고찰을 하였으며, 얻어진 주요 결과는 다음과 같다. (1) 신발의 갑피용 및 안창용 최적소재로서 경편직물을 선정하였으며, PET필름의 최적 요구특성은 내수성 9460mmH2O, 투습성 10,000g/m2/24hrs, 인장강도42kgf/cm2, 신도249% 였다. (2) Hot-melt 라미네이팅 공정에서의 투습방수성을 좌우하는 Dot roll No, Coating gap의 최적조건은 CP75(Engraved dot roll no), -0.2mm(Coating Unit gap) 였다. (3) EVA base polymer 및 기타 조제의 최적 배합비를 확립하고 이를 바탕으로 compound를 제조하여 Press로 molding하여 안창용 Sponge를 얻었다. (4) 안창 sponge 위에 점착된 knit 소재의 소취효과는 우수하였으며, 갑피용 투습방수 경편직물의 보온성도$15{\sim}20%$로 우수하였다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.27 no.1
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• pp.56-60
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• 2014

The polyimide composite membranes were prepared with polyimide composite solutions including graphenes by using the phase inversion method. The morphologies of these membranes were significantly changed according to the graphene loadings in composite solutions and the solvent systems of the composite solutions. The finger-like macro-voids were formed in the hollow fiber membranes which were prepared in the NMP solvent system with a small amount of ethanol. As increasing the content of the viscous alcohols such as glycerol or 1,3-propanediol in the composite solution, however, the morphologies of the hollow fiber membranes were changed to sponge-like types. In case of flat membranes, the increase of graphene content in polyimide composites causes that their membranes change from the finger-like macro-porous to sponge-like morphologies.

• Journal of Korean Biological Nursing Science
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• v.21 no.1
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• pp.37-45
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• 2019

Purpose: This descriptive research was on hand dermatitis in clinical nurses. Nurses often have a high rate of hand dermatitis with several factors associated with the dermatitis. The factors analyzed in this study included; general characteristics, work-related factors, hand washing, and allergies relate to hand dermatitis. Methods: Data were collected from April to May 2016. The subjects were nurses who had worked 12 months or more in a University Hospital. They voluntarily gave their consent for the research. The Symptombased questionnaires were sent to 220 nurses and 199 responses were returned. Collected data were analyzed using frequency, percentage, mean, standard deviation, ${\chi}^2-test$, and logistic regression analysis using SPSS 23.0. Results: Prevalence of dermatitis in nurses was 48.2%. Nurses who had worked for over three years were twice more likely to suffer hand dermatitis than nurses who had worked for 3 years or less (adjusted odds ratio [adj. OR]= 1.97, p= .036). Nurses who used alcohol sponge swabs more than 20 times per shift were 2.5 times more likely to suffer hand dermatitis as compared to those who used them less times (adj. OR = 2.51, p= .023). Conclusion: Results revealed that about a half of the clinical nurses suffered from hand dermatitis, hence it is crucial to find appropriate interventions for dermatitis prevention. This concern needs to be addressed especially in nurses who have more work experience and use more alcohol sponge swabs.

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09b
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• pp.1187-1188
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• 2006

This paper compares the effect of using different types of iron powders for the preparation of $Sm_2Fe_{17}$ by calciothermic reduction-diffusion (CRD). Three types of iron powder were used: carbonyl, sponge and water atomized. The results show that, when immediately nitrogenated after the CRD process, $Sm_2Fe_{17}$ prepared from sponge and water atomized iron powders yield $Sm_2Fe_{17}N_3$-magnets with a high degree of texture. However, after a suitable treatment with hydrogen followed by nitrogenation, $Sm_2Fe_{17}$-powders made from Carbonyl iron produce magnets with the best quality regarding coercivity, remanence and degree of texture.

• Journal of Periodontal and Implant Science
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• v.29 no.3
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• pp.447-472
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• 1999

The preclinical and clinical studies reviewed herein show that rhBMP-2 induces normal physiologic bone in relevant defects in the craniofacial skeleton. The newly formed bone assumes characteristics of the adjacent resident bone, and allows placement and osseointegration of dental implants. Clearly, the bone inducing capacity of rhBMP-2 is carrier and site dependent. rhBMP-2 in an absorbable collagen sponge carrier induces relevant bone formation in space providing defects. Space providing carries extends this possibility to non-space providing sites. Notably, some ceramic and polymeric biomaterials may substantially interfere with rhBMP-2 induced osteogenesis.