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α-티타늄 평판표면에서 강체 구형팁의 스크래치로 인한내부 결정구조 특성 변화에 대한 연구
정예리,김진호,이태일 한국트라이볼로지학회 2023 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.39 No.5
Titanium alloys are widely recognized among engineering materials owing to their impressive mechanical properties, including high strength-to-weight ratios, fracture toughness, resistance to fatigue, and corrosion resistance. Consequently, applications involving titanium alloys are more susceptible to damage from unforeseen events, such as scratches. Nevertheless, the impact of microscopic damage remains an area that requires further investigation. This study delves into the microscopic wear behavior of α-titanium crystal structures when subjected to linear scratch-induced damage conditions, utilizing molecular dynamics simulations as the primary methodology. The configuration of crystal lattice structures plays a crucial role in influencing material properties such as slip, which pertains to the movement of dislocations within the crystal structure. The molecular dynamics technique surpasses the constraints of observing microscopic phenomena over brief intervals, such as sub-nano- or pico-second intervals. First, we demonstrate the localized transformation of lattice structures at the end of initialization, indentation, and wear processes. In addition, we obtain the exerted force on a rigid sphere during scratching under linear movement. Furthermore, we investigate the effect of the relaxation period between indentation and scratch deformation. Finally, we conduct a comparison study of nanoindentation between crystal and amorphous Ti substrates. Thus, this study reveals the underlying physics of the microscopic transformation of the α-titanium crystal structure under wear-like accidental events.
자연 치유된 원발성 피부 Alternariosis 2예
정예리,장성남,한승경,조흔정,서순봉,이광훈 대한의진균학회 1999 대한의진균학회지 Vol.4 No.2
The treatment of cutaneous altemariosis consists of surgical excision and systemic antifungal agent. However, only reduction or cessation of corticosteroids and immunosuppressive therapy, if it is possible, can be sufficient to treat the lesion in some cases. We present two cases of spontaneously healed primary cutaneous altemariosis. Case 1 was a 73-year-old female patient with diabetes mellitus, heart failure, chronic renal failure and chronic hepatitis. Case 2 was a 64-year-old male patient with iatrogenic Cushing's syndrome and diabetes mellitus. The correction of the underlying diseases resulted in improvement of the primary cutaneous altemariosis. [Kor J Med Mycol 4(2): 137-142]
거주 지역에 따른 다문화가정 유아와 일반가정 유아의 언어발달 및 사회적 힘의 비교
정예리(Jeong Ye-Ri),이숙희(Lee Sook-Hee) 한국영유아보육학회 2010 한국영유아보육학 Vol.0 No.63
본 연구는 거주 지역에 따른 다문화가정 유아와 일반가정 유아의 언어발달과 사회적 힘을 비교하는데 그 목적이 있다. 연구 목적을 달성하기 위하여 도시지역과 농촌지역에 거주하고 있는 만 5세 다문화가정 유아 80명과 일반가정 유아 80명, 총 160명을 대상으로 언어발달 검사와 사회적 힘 검사를 실시하였다. 본 연구의 결과는 다음과 같다. 첫째, 다문화가정 유아의 언어발달 수준은 일반가정 유아의 언어발달 수준보다 낮았다. 이러한 경향은 도시지역 거주 다문화가정 유아와 농촌지역 거주 다문화가정 유아에게 동일하게 조사되었다. 둘째, 다문화가정 유아의 사회적 힘이 일반가정 유아의 사회적 힘보다 낮은 것으로 나타났으며, 이러한 결과 또한 도시지역 거주 다문화가정 유아와 농촌지역 거주 다문화가정 유아에게 동일하게 나타났다. 다문화 가정 아동은 언어발달과 사회적 관계 능력에 있어서 일반 가정 아동들에 비하여 문제가 있는 것으로 판단할 수 있다. 따라서 다문화 가정 유아들을 위한 언어지도 교육 및 또래 내에서 의사소통을 활성화시키기 위한 보다 많은 노력이 요구된다. This study aims to compare the language development and social power of young children from multicultural families to those of young children from ordinary families, in regard to their residential areas. To that end, the language development scale and social power scale were conducted to total 160 5-year-old young children of 80 from multicultural families and 80 from ordinary families. Among the 80 young children from multicultural/ordinary families, 40 were living in urban areas and the other 40 were living in rural areas. The result of this study can be summarized as follows: first, the language development level of young children from multicultural families was found to be lower than that of young children from ordinary families. This tendency equally applied to both young children from multicultural families living in urban areas and those living in rural areas. Second, the social power of young children from multicultural families was also found to be weaker than that of young children from ordinary families. This tendency again equally applied to both young children from multicultural families living in urban areas and those living in rural areas. Therefore, young children from multicultural families seem to have more problems with language development and social relation ability than young children from ordinary families. These results suggest that it is demanded to make more efforts to conduct Korean language education and peer relationship training for young children from multicultural families.