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폴리에틸렌 테레프탈레이트(PET)의 內部摩擦損 및 誘電損의 溫度特性에 關한 相關性 硏究
李準雄,康道烈,金在煥,金鳳洽 光云大學校 1982 論文集 Vol.11 No.-
This paper investigated comparatively the temperature dependence of dielectric α relaxation process and dynamic mechanical α relaxation process. Dynamic mechanical and dielectric loss data on a given polythylene terephthalate (PET) are generally viewed as being directly comparable. This is based on the notion that, if each exhibits a loss peak at about the same temperature and frequency, they must be manifestations of the same process. This supposes that the process couples in the exact same manner with both mechanical and electrical stress fields. That this need be so may be seen from the fact that not only non polar process give rise to dynamic mechanical losses, but also dipolar losses. The results obtained are as follows. 1) Dielectric α peak and dynamic mechanical α peck in PET are observed at almost same temperature correspondently. 2) The elongated sample exhibits the higher α peck at the almost same maximum temperature. 3) The magnitude, location and breadth of the α relaxation in PET are strong function of the degree of crystallinity and also the manner in which a particular degree of crystallinity is attained. And the degree of crystallinity is changed with external conditions, that is, density, annealing. quenching, drawing, orientations and irradiation etc. 4) In the results of observation the absorption peak at 1,788 ?? on infrared spectra, the more bigger concentration of carbonyl dipole group was observed on the elongated sample.
하국산 기름종개속 어류의 계통분류학적 연구 VI. 줄종개와 점줄종개의 잡종에 관한 연구
Kim, Jae-Heup,Yang, Suh-Yung 한국통합생물학회 1993 동물학회지 Vol.36 No.4
Sinca early 1930' Colitis taenia striate were introduced to the Donsgjin in Chollabukdo, where it hybridized with an endemic subspecies C. tiutheri. Protein electrophoresis revealed high levels of hybridization with intensive backcrossing occupied approximately 20 kilometers of the river. This is roughly one-half of tech historic range of the endemic species. The average frequency of introduced alleles of three diagnostic loci ranged 0.03-0.46 among 11 sites in tech svrnpatric area. Clinal patterns in allele frequencies suggest C. tiutheri were introduced in an upper reaches of the Dongjin and downstream dispersal of the introduced alleles followed. There is little linkasedisequilibrium between the diagnostic loci, suggesting the nuclear genomes of tech two subspecies are randomly associated. The evidence presented here and previously supports recognition of C. t. striata and C. t. lutheri as the typical subspecies.
자동차 시트 쿠션 프레임 및 백 프레임의 구조 강도 해석
김성수(Kim Seong-Soo),김기선(Kim Key-Sun),최두석(Choi, Doo-Seuk),박상흡(Park, Sang-Heup),김세환(Kim Sei-hwan),조재웅(Cho Jae-Ung) 한국산학기술학회 2012 한국산학기술학회논문지 Vol.13 No.11
자동차의 다양한 부품 중 자동차 시트는 인간과의 직접 접촉 부위로서 승차감을 평가 할 수 있는 가장 기 본적인 항목이다. 따라서 자동차 시트는 승차감과 동시에 충분한 강성과 강도를 가져야 할 것이다. 본 연구에서는 자동차 시트에서의 시트 쿠션 프레임과 백 프레임을 3D 모델링하였고, 쿠션 프레임의 비틀림 강도, 수직하중강도 시 험, 백 프레임의 강도 시험 3가지 실험에 대해서 시뮬레이션으로 구조해석을 하였다. 해석결과, 쿠션 프레임 비틀림 강도 시험에서는 초기 전변형량의 최대값은 5.8421mm가 나왔고, 영구 전변형량의 최대값은 0.02539mm가 나왔다. 쿠션 프레임 수직하중강도 시험에서는 쿠션 프레임 앞쪽 끝단의 전변형량은 2.1159mm이고, 뒤쪽 끝단은 0.0606mm 이다. 하중을 더 증가한 경우는 전변형량의 최대값은 3.1739mm가 나왔다. 3 가지의 백 프레임 강도 시험에서는 최 대의 전변형량은 0.18634mm로 나타났다. 본 연구결과는 자동차 시트 쿠션 프레임 및 백프레임의 과도한 변형 및 파 괴가 없음으로서 승객의 안전을 보장하는 충분한 강성과 강도를 검증할 수 있었다. Among the various parts of automobile, automotive seat is the most fundamental item that ride comfort can be evaluated as the direct contact part with human body. Automotive seat must have the sufficient rigidity and strength at the same time with ride comfort. In this study, cushion frame and back frame at car seat are modelled with 3D. There are structural simulation analyses about 3 kinds of tests on torsion strength, vertical load strength and back frame strength. In the analysis result, the initial total deformation and the permanent total deformation has the maximum values of 5.4821 mm and 0.02539mm respectively at the torsion strength test of cushion frame. Total deformations at front and rear end parts of cushion frame become the values of 2.1159mm and 0.0606mm respectively at the test of vertical load strength of cushion frame. In case of more than this load, the maximum value of total deformation also becomes 3.1739mm. The maximum value of total deformation becomes 0.18634mm at 3 kinds of the strength tests on back frame. By the study result of no excessive deformation and no fracture cushion frame and back frame at automotive seat, the sufficient rigidity and strength to guarantee the safety of passenger can be verified.
Kim, Jong-Bum,Kim, Jae-Heup,Yang, Suh-Yung The Korean Society for Integrative Biology 1997 Korean journal of biological sciences Vol.1 No.4
Genetic and morphological variations of Rhinogobius giurinus were surveyed. Populations of R.giurinus were clearly divided into two forms (Form-A and Form-B). Starch gel variation of this species. Three loci (Aco, Mpi, aGpd) out of 27 showed fixed allelic differences between Form-A and Form-B and they are well differentiated from each other genetically (Rogers' S=0.871). These two forms, moreover, are found to be allopatric in distribution and morphologi cally different in body length and caudal fin color pattern. Therefore, they are considered as two distinct taxa of subspecific rank. In addition, the genetic relationships among 5 taxa within 4 species of the genus Rhinogobius were investigated. Three species of the Rhinogobius brunneus complex (R.sp. OR, R. sp. CB and R. sp. CO) are well differentiated from each other genetically and two taxa of R. giurinus are genetically divergent from three species of the Rhinosotius brunneus complex (average Nei's D=0.603, average Rogers'=0.534).
열필라멘트 화학증착법을 이용한 다이아몬드 - 합성에서 평형조성의 계산
김재영,이시우,박용찬,문상흡,최윤 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.6
다이아몬드 기상합성에서 과량의 수소존재하에서 H₂-CH₄, H₂-CF₄, H₂-CH₃Cl 및 H₂-CS₂계의 반응온도에 대한 열역학적 평형조성이 계산되었다. 산소 및 질소원료가 첨가된 경우 반응생성물로서 기체 화학종뿐만 아니라 고체상의 흑연 조성의 변화도 계산되었다. 평형조성에서 아세틸렌 및 메틸 라디칼의 농도를 최대로 유지하기 위한 반응온도는 약 2,000 K 근처로 나타났다. H₂-CF₄ 및 H₂-CH₃Cl 계에서는 HF 및 HCl 형성반응이 열역학적으로 유리하게 나타났다. 반응생성물인 고체상 흑연의 평형조성은 산소기체의 존재 유무에 가장 크게 영향을 받는 것으로 나타났다. The thermodynamic equilibrium compositions of H₂-CH₄, H₂-CF₄, H₂-CH₃Cl and H₂-CS₂ systems used in the vapor-phase synthesis of diamond were calculated as a function of temperature in the presence of excess H₂ gas. The composition changes of solid-phase graphite as well as gas species were also investigated, when oxygen and nitrogen sources were incorporated into the systems. It was proved that the reaction temperature to maintain the maximum amount of C₂H₂ and CH₃ species in the equilibrium compositions was about 2,000 K. In the H₂-CF₄ and H₂-CH₃Cl systems, the formation reactions of HF and HCl were thermodynamically favorable. The equilibrium composition of solid-phase graphite reaction product was affected most strongly by the presence of oxygen sources.