• International Journal of Advanced Culture Technology
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• 제11권1호
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• pp.221-231
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• 2023

Nowadays, more and more countries are paying attention to basic teaching, so it can be found that they are carrying out a new round of basic teaching reform. The fundamental purpose is to adapt to the economic, cultural and technological development of the 21st century, so that their nationals will not be eliminated in the competition of the world environment, the spiritual civilization and material life of the nationals can be further improved, and they can have an advantage in the competition and catch up with the advanced level of the world. The cultivation of preschoolers' mental health determines the future development of a person. Through the long-term practice of art teaching at the Longyuan Branch of the District Third Kindergarten of Guangxi, This paper summarizes some effective teaching methods to cultivate children's connection ability and sense of security through aesthetic education.Firstly, preschoolers' contact ability was studied, and the aspects such as the definition of contact ability and the reasons for the formation of contact ability were explored. Secondly, the development of preschoolers' sense of security, what to avoid in order to develop a good sense of security and the effects of security on children were investigated. Finally, several specific teaching cases were written based on these theories. Through these cases, aesthetic education was utilized to promote preschoolers' contact ability and develop a sense of security. The study mainly draws the following conclusions that if children want to have a successful career, a happy family in the future, it is crucial to have the ability of connect and security in childhood. Aesthetic education can promote the formation of children's ability of connection and security.Finally, I write specific teaching cases based on the above theories and practice, through which these cases use aesthetic education to promote the formation of children's contact ability and sense of security.

• 통합자연과학논문집
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• 제17권3호
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• pp.67-73
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• 2024

Hydrophilic contact lens was prepared by dispersing MXene material in a hydrogel mixture, and the purpose of this study was to evaluate its properties as an ophthalmic material. The MXene used in the experiment was manufactured through an etching process using titanium aluminum carbide 312 [Ti3AlC2] and hydrofluoric acid [HF]. For the preparation of hydrophilic contact lenses, 2-hydroxyethyl methacrylate [HEMA], a photoinitiator 2-hydroxy-2-methylpropiophenone [2H2M], and a cross-linker Ethylene glycol dimethacrylate [EGDMA] were used, and UV-rays was irradiated for 50 seconds for photopolymerization. Optical transmittance, refractive index, water content, contact angle, electromagnetic wave shielding ability, and photo-thermal conversion effect were measured to evaluate the physical properties of the manufactured contact lens. Compared to MXene materials, MXene mixed with Dimethyl sulfoxide [DMSO] had superior dispersion ability in organic solvents, and the transparency of the prepared hydrophilic contact lenses was high. MXene did not significantly affect the refractive index and water content, and improved the wettability of the contact lens. In addition, the MXene material used as an additive showed electromagnetic wave shielding ability and photo-thermal conversion effect based on its excellent electrical conductivity. It is judged that the mixture using MXene as an additive can be used as a functional contact lens material for electromagnetic wave shielding and ocular photo-thermal therapy.

• Tribology and Lubricants
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• 제15권2호
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• pp.164-170
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• 1999

Gerotor is widely used as a hydraulic pump or motor, by virtue of its volume changing ability. Performance deterioration of a gerotor hydraulic motor mainly due to the wear come from the contact between inner rotor with trochoidal curve and outer rotor with circular arc profile. This research covers the basic investigation about the contact forces of a gerotor hydraulic motor using analytic method. The influence of the eccentricity and the radius of circular arc teeth on the contact stress was evaluated.

• 대한전기학회논문지
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• 제41권2호
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• pp.170-177
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• 1992

Contact resistance and contact leakage current of the Al/TiSiS12T/Si system are investigated for NS0+T and PS0+T junctions. SALICIDE (Self Aligned Silicide) process was used to make the Al/TiSiS12T/Si system. Titanium disilicide is one of the most common silicides because of its thermal stability, ability to form selective formation and low resistivity. In this paper, RTA temperature effect and Junction implant dose effect were evaluated to characterize contact resistance and contact leakage current. The TiSiS12T contact resistance to NS0+T silicon is lower than that to PS0+T silicon, and TiSiS12T of contact leakage current to NS0+T silicon is lower than that to PS0+T silicon. Contact resistance and contact leakage current of the Al/TiSiS12T/Si system by this method were possible for VLSI application.

• 대한물리의학회지
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• 제10권4호
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• pp.49-57
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• 2015

PURPOSE: This study aimed to investigate the effect of emphasized initial contact gait training on balance and gait ability in hemiplegia patients. METHODS: Twenty-four hemiplegic patients were randomly allocated to an experimental group or control group. All participants received 30-min neurodevelopmental treatment. Furthermore, the experimental group received initial contact-emphasized auditory feedback gait training, whereas the control group received gait training without auditory feedback. The intervention was performed 3 times per week, 20 min per each time, for a total of 6 weeks. Balance was assessed using the center of pressure path length, center of pressure velocity, and limitation of stability path length, whereas gait ability was assessed using the 10-m walking test and functional gait assessment. RESULTS: In both groups, center of pressure path length and center of pressure velocity significantly decreased after training. Compared to the control group, the experimental group showed a 10% significant improvement (p<.05). In the limitation of stability path length of both sides, the experimental group showed a significant increase compared to that before intervention. Compared to the control group, the experimental group showed a 7% significant improvement in results of the 10-m walking test and functional gait assessment (p<.05). CONCLUSION: Emphasized Initial contact gait training is considered an effective treatment for improving gait ability and balance ability in stroke patients.

• 한국발생생물학회지:발생과생식
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• 제16권4호
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• pp.329-338
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• 2012

The proliferation of embryonic cells or adult stem cells in tissue is critically regulated during development and repair. How limited the proliferation of cells, so far, is not much explored. Cell-cell contact proliferation inhibition is known as a crucial mechanism regulating cell proliferation in vitro and in vivo. In this study we examined the characters of mouse subcutaneous adipose derived stem cells (msADSC) whether they lost or get contact inhibition during in vitro culture. The characters of msADSC growth after confluence were analyzed using confocal microscope and the expression profiles of contact inhibition related genes were analyzed according to the morphological changes using real-time PCR method. msADSC showed overlapping growth between them but not after passage 14. The cell shapes were also changed after passage 14. The expression profiles of genes which are involved in contact inhibition were modified in the msADSC after passage 14. The differentiation ability of msADSCs to adipocyte, chondrocyte and osteocyte was not changed by such changes of gene expression profiles. Based on these results, it is revealed that smADSC were characterized by getting of strong cell-cell contact inhibition after passage 14 but the proliferation and developmental ability were not blocked by the change of cell-cell contact proliferation inhibition. These finding will help to understand the growth of adipose tissue, although further studies are needed to evaluate the physiological meaning of the cell-cell contact proliferation inhibition during in vitro culture of msADSC.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.178-182
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• 1991

Contact resistance and contact leakage current of the $Al/TiSi_2/Si$ system are investigated for $N^+\;and\;P^+$ junctions. Titanium disilicide is one of the most common silicides because of its thermal stability, ability, to form selective formation and low resistivity. In this paper, the effect of RTA temperature and Junction implant dose are characterized. The $TiSi_2$ contact resistance to $N^+$ silicon is lower than that of Al to $N^+$ silicon, but $TiSi_2$ of contact resistance to $P^+$ silicon is higher than that of Al to $P^+$ silicon. The $TiSi_2$ of contact leakage current to $N^+\;and\;P^+$ silicon is similar to that of Al contact.

• 대한치과보철학회지
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• 제41권1호
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• pp.61-70
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• 2003

The purpose of this study was to investigate the contact angles and wettability of conventional dental stones and improved dental stones and newly developed dental stones on several impression materials. Materials included in this study were several dental stones and newly developed dental stone ; 2 type III stones (Snow Rock, New Diastone), 6 type IV stones(Crystal Rock, Vel Mix, Fuji Rock, Tuff Rock, Resin Rock and newly developed dental stone) and 1 type V stone (Die Keen). Contact angles on the impression materials were measured with contact angle measuring device. Ten specimens for each material, total 180 specimens were made on void entrapment model. The two impression materials (Handae, GC) were used to produce 9 groups of die stone casts form void entrapment model. Voids in the stone casts were counted under a stereoscopic microscope. The grad for the reproduction ability of each materials on the void entrapment model was calculated from the casts by one examiner. From the experiment, the following results were obtained : 1. The newly developed stones showed smallest contact angle. Type III dental stone had larger contact angles than type IV and V stones. Contact angle was much affected by the impression materials. 2. Resin containing die materials such as Tuff Rock and Resin Rock had smallest void number than any other groups. 3. In comparing reproduction parameters, Tuff Rock and Resin Rock presented superior results, while Vel Mix showed lowest reproduction ability.

• 청정기술
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• 제14권2호
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• pp.95-102
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• 2008

친환경적인 대체 세정제를 채택하기 위해서는 세정제의 세정성, 환경성, 경제성을 평가하여 체계적인 선정절차에 의거하여 도입 적용하여야 하며 객관적이고 효율적인 세정성 평가방법의 정립이 현시점에서 매우 중요하다. 따라서 본 연구에서는 여러 세정성 평가 방법들 중 광전자방출법(optically stimulated electron emission)(OSEE)을 활용한 세정성 평가에 관한 연구를 하였다. 실험에 사용된 오염물은 플럭스, 솔더, 그리스, 절삭유, 그리고 그리스 35%와 절삭유 65%을 혼합하여 만든 혼합 오염물로서 세정제에 의한 이들의 세정성을 평가하였다. 본 연구실에서 개발하였거나 조제한 세정제를 이용하여 세정 후 OSEE법 측정 결과와 중량법 및 접촉각측정법에 의한 세정성 평가방법을 비교 분석하였다. 본 연구 결과로 플럭스와 혼합오염물을 세정한 경우의 OSEE 세정효율은 중량법과 거의 유사한 결과를 나타내었지만, 솔더와 그리스 세정의 경우는 UV를 반사 또는 흡수하여 중량법과 비교할 수 없었다. 그리고 절삭유 세정의 경우 실질적으로 눈에 보일 정도로 피세정물 표면에 오염물이 남아 있음에도 불구하고 중량법 측정 시 100%의 세정효율을 보임으로써 중량법 측정의 한계를 보였지만 OSEE법으로는 미소잔류 절삭유의 존재를 측정할 수 있었다. 또한 OSEE법과 접촉각측정법의 세정성을 비교측정한 결과로 플럭스, 혼합 오염물 그리고 절삭유의 세정성 평가는 OSEE법과 접촉각측정법이 유사한 세정효율을 보여주었다. 그리고 솔더와 그리스 세정은 접촉각측정법이 OSEE법보다 더욱 정밀하게 세정성을 평가할 수 있는 것으로 판단되었다.

• Tribology and Lubricants
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• 제9권2호
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• pp.36-48
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• 1993

This study is concerned with the changes (deterioration) of the mechanical properties of used oil in the gasoline engine. The analysed properties of used oil were friction, antiwear, wear debris, load-carrying ability and the formation of surface film. From this study, it was found that the oil used in engine was deteriorated to increase the wear and fricion and decrease the load-carrying ability as the running distance of oil was increased. Also the main cause of deterioration was related to the formation of the protective film on the contact zone. When the film was composed with rich additives (sulfur), this could properly protect contact zone from the increase of wear and friction. But as oil was deteriorated, it could not form such a film and therefore the protective ability of sliding surface diminished.