• 대한기계학회:학술대회논문집
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• 대한기계학회 2005년도 창립60주년 기념 추계 학술대회
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• pp.159.2-159.2
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• 2005

• 한국주거학회논문집
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• 제10권3호
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• pp.187-192
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• 1999

• 한국어류학회지
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• 제13권4호
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• pp.254-260
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• 2001

좀구굴치 성숙란의 난여포층은 외층인 theca cell과 내층인 granulosa cell로 구분되며 특히 원주형인 granulosa cell은 분비활동으로 인하여 세포질에 분비물이 축적되면서 난모세포를 둘러싸게 된다. 이러한 granulosa cell은 난황형성 초기인 난황포 시기에 입방형태를 보이지만 난황구시기에는 원주상세포로 바뀌면서 점액을 분비하는 특징을 보여 주고 있다. 이러한 부착물질은 형태가 없으며 전자밀도가 높다. 또한 이러한 분비물을 가지는 난막은 난황형성이 더욱 진행됨에 따라 동물극 부근이 식물극보다 더욱 두꺼워지고 커지게 된다. 이러한 점막여포층 아래에는 약 $7.8{\sim}11.5\;{\mu}m$ 두께의 방사대가 존재한다. 방사대는 전자밀도가 낮은 외층과 3~5층의 여러 전자밀도층을 가지는 내층으로 구성되어 있다. 한편 점막여포층은 방사대에 존재하지 않고 있기 때문에 이 물질은 난세포질이 여포상피로부터 기원된 것으로 생각된다.

• 한국강구조학회 논문집
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• 제14권1호
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• pp.95-104
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• 2002

본 연구에서는 타이어의 접지폭을 고려한 새로운 3차원 차량모델을 개발하여 차량의 동적하중에 대하여 연구하였다. 3차원 차량모델에는 타이어의 접지폭과 텐덤 스프링 차륜축의 피칭을 고려하여 대형차량인 2축 차량과 3축 차량을 각각 7-자유도와 8-자유도로 모델링 하였다. 차량의 운동방정식은 Lagrange 방정식을 사용하여 유도하였으며 IMSL에 내장되어 있는 5차 Runge-Kutter 방법을 사용하여 해를 계산하였다. 본 3차원 차량모델을 이용하여 수치해석한 결과와 Whittemore 등이 실시한 실험값을 비교 검토하여 그 타당성을 입증하였다. 수치해석으로 구한 결과는 실험값과 매우 잘 일치하였다. 차량의 동적 해석에서는 2축 차량인 8톤 덤프트럭과 3축 차량인 15톤 덤프트럭이 스탭 범프를 통과할 때와 여러 가지 종류의 도로를 1.0 km 주행하는 동안 발생하는 타이어력의 최대 충격계수를 구하였다.

• 한국초전도학회:학술대회논문집
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• 한국초전도학회 2002년도 High Temperature Superconductivity Vol.XII
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• pp.33-33
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• 2002

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1996년도 추계학술대회 학술발표 논문집
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• pp.101-103
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• 1996

In this note we will discuss extension of fuzzy Lie subalgebra and fuzzy Lie ideals of a Lie algebra L on universal enveloping algebra U(L) of L and will study some relations among them.

• Journal of Mechanical Science and Technology
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• 제14권4호
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• pp.408-417
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• 2000

The design and simulation of meshing of a single enveloping worm-gear drive with modified surfaces is presented. Generally worm-gear is generated by the hob which is identical to the worm. This process guarantees the conjugation between the worm and the gear but results in a line contact at every instant which is very sensitive to misalignment. The localization of bearing contact is necessary to reduce the sensitivity of the worm-gear drive to misalignment. Practically this localization is achieved by application of an oversized worm type hob to cut the worm-gear. The oversized hob approach is very practical and effective to localize bearing contact but can not provide the conjugation between the worm and the modified worm-gear. This work proposes an analytical procedure to make the worm surface conjugate to the worm-gear which is cut by the oversized hob. The developed computer program allows the investigation of the influence of misalignment on the shift of the bearing contact and the determination of the transmission errors, the contact ratio and the principle curvatures. The developed approach has been applied for ZK type of single-enveloping worm-gear drives and the developed theory is illustrated with a numerical example.

• 한국실내디자인학회논문집
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• 제16권6호
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• pp.36-46
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• 2007

Regeneration of old buildings is one of the most imperative responses to the 21th century issue of sustainable urban architectural environment. In particular, creative circulation of generation which conversion means highlights the conversion as a new design method. In this study, by examining buildings built over the last decade, the mutual relationship between old elements of existing buildings and new elements of newly required functions was analyzed and types of relationships such as 'alien insertion', 'mediate intervention', 'endogenous expansional enveloping', 'contrastive confliction' and 'over-layering' were defined. In addition, design strategies including the paradoxical curio, fore-grounding and unification were derived from each relationship. Finally, according to the relation type and design strategy, this study suggests several features of conversion design; (1) maximization of symbolism using unfamiliarities - emphasizing futuristic or contextual symbol with intentional contrasts by preserving the work or using contemporary addition; (2) time confusion using neutral space - meeting the need by harmonizing and cooperating existing elements and new elements; (3) mutual emphasizing by individualization - revealing differences between old and new for an aesthetical tension; (4) synchronism by constructional combination - making the one unity of different layers; (5) expansion by enveloping - experience of visual reverse and creation of extra space by roofing above building groups. The reconversion should be continuously researched in the future since conversion is a sustainable design method for the future of architecture.

• 대한수학회보
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• 제34권3호
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• pp.447-457
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• 1997

Let A be a $C^*$-algebra and $A^**$ its enveloping von Neumann algebra. Pedersen and Akemann developed four concepts of lower semicontinuity for elements of $A^**$. Later, Brown suggested using only three classes: strongly lsc, middle lsc, and weakly lsc. In this paper, we generalize the concept of weak semicontinuity [1, 3] to the case of unbounded operators affiliated with $A^**$. Also we consider the generalized version of the conditions of the Brown's theorem [3, Proposition 2.2 & 3.27] for unbounded operators.

• 호남수학학술지
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• 제19권1호
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• pp.21-27
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• 1997

We shall define three kinds of points for algebraic varieties associated to the center 3 of U(L) which is the universal enveloping algebra of a finite-dimensional modular Lie algebra over an algebraically closed field F of prime characteristic p. We announce here that $sp_4$(F) with p = 2 has a subregular point.