• 대한수학회보
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• 제51권3호
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• pp.667-680
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• 2014

In this paper, $\mathcal{I}$-scattered spaces are introduced, and their characterizations and properties are given. We prove that (X, ${\tau}$) is scattered if and only if (X, ${\tau}$, $\mathcal{I}$) is $\mathcal{I}$-scattered for any ideal $\mathcal{I}$ on X.

• Journal of applied mathematics & informatics
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• 제23권1_2호
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• pp.435-443
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• 2007

An important approach towards solving the scattered data problem is by using radial basis functions. However, for a large class of smooth basis functions such as Gaussians, the existing theories guarantee the interpolant to approximate well only for a very small class of very smooth approximate which is the so-called 'native' space. The approximands f need to be extremely smooth. Hence, the purpose of this paper is to study approximation by a scattered shifts of a radial basis functions. We provide error estimates on larger spaces, especially on the homogeneous Sobolev spaces.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 춘계학술대회 논문집
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• pp.141-144
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• 2014

In urban spaces surrounded by buildings, trees could disperse sound energy, which affect sound level distribution and street canyon reverberation. Therefore, this paper examines the amount of scattered sound energy from a tree in open field by means of a reverberation time (RT). Five trees of different species and crown sizes were considered. The influential factors include crown size and shape, foliage condition, and source-receiver distance. The results show that RT is proportionally increased with the increase of tree crown sizes, which is the most determining factor. The maximum RT measured was 0.34 sec at 4000 Hz for the studied trees in leaf. The presence of leaves increased RT at high frequencies, typically by 0.14 sec at 4000 Hz. With increasing source-receiver distance within 40 m, RT was slightly changed.

• 한국조경학회지
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• 제37권5호
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• pp.53-63
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• 2009

본 연구는 공원녹지체계를 광의의 개념으로서 오픈스페이스적으로 접근하는 것이라고 설정하고, 그 방법론을 모색하고 실증적으로 대전광역시 도심지역에 적용하였으며, 그 적용 결과에 기초하여 대전광역시 오픈스페이스 네트워크 구축방안을 제시하였다. 연구방법으로 첫째, 대전광역시 구도심을 대상으로 오픈스페이스 네트워크의 적용 가능성을 검토하며, 둘째, 사례지역의 결과를 토대로 대전광역시의 오픈스페이스 유형별 네트워크를 분석하고, 이를 종합함으로써 대전광역시 오픈스페이스네트워크를 구상토록 하였다. 연구결과로서, 활동오픈스페이스 요소인 관공서 및 업무시설들은 자체적으로 또는 건물 전면부에 공개공지가 조성되어 있고, 이들 전면부 공개공지는 보행로(그레이 오픈스페이스)와 연결되어 있으며, 이들 보행로는 결과적으로 대규모 공원이나 하천(그린 및 블루 오픈스페이스)으로 연결되어, 통합하여 하나의 공간체계를 형성한다고 할 수 있다. 따라서 도시 중심부에는 그동안 공원녹지체계의 기본적 요소라고 할 수 있는 공원과 녹지가 상대적으로 적기 때문에, 공원녹지의 추가적 확보가 이루어져야 공원녹지체계의 개선이 진행된다고 볼 수 있다. 도심부에 새로운 공원녹지의 신규조성은 매우 어렵다는 전제하에 도심부에 마치 실핏줄처럼 분포하고 있는 오픈스페이스 네트워크체계로 접근할 경우, 도심부에 보다 건강한 휴식공간체계가 형성될 것이다.

• The Journal of the Acoustical Society of Korea
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• 제17권2E호
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• pp.53-58
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• 1998

In this paper, we study the response of several anisotropic systems to buried transient line loads. The problem is mathematically formulated based on the equations of motion in the constitutive relations. The load is in form of a normal stress acting with arbitrary axis on the plane of monoclinic symmetry. Plane wave equation is coupled with vertical shear wave, longitudinal wave and horizontal shear wave. We first considered the equation of motion in reference coordinate system, where the line load is coincident with symmetry axis of the orthotrioic material. Then the equation of motion is transformed with respect to general coordiante system with azimuthal angle by using transformation tensor. The load is first described as a body force in the equations of the motion for the infinite media and then it is mathematically characterized. Subsequently the results for semi-infinite spaces is also obtained by using superposition of the infinite medium solution together with a scattered solution from the free surface. Consequently explicit solutions for the displacements are obtained by using Cargniard-DeHoop contour. Numerical results which are drawn from concrete examples of orthotropic material belonging to monoclinic symmetry are demonstrated.

• 무역상무연구
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• 제60권
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• pp.235-255
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• 2013

This thesis examines the problems faced in the electronic trade specialized service provider for which improvements are necessary, and suggests various ways of overcoming those problems. First, from the legal aspect, it is necessary to clarify the scope of duties as well as to expand the threshold for entrance and business areas through the amendment of related laws. Second, from the operating aspect, the e-trade specialized service provider should be able to provide convenient work spaces through user-centered interface by connecting, integrating, automating and simplifying various services scattered around through the establishment of an operating system. Third, from the institutional aspect, trade firms should be able to perform e-trade duties without difficulties by specializing and increasing the size of the e-trade specialized service provider system and strengthening job competence. For this, it is required to improve legal registration requirements to enhance the reliability of the e-trade specialized service provider system and secure its financial capacity.

• 한국임상수의학회지
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• 제17권1호
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• pp.129-133
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• 2000

Based on pathological findings, 5 German shepherds, revealed a mean age of 7.6 years, showing no clinical signs were diagnosed as tracheopathia osteochondroplastica(TOC). Grossly, multiple small-sizecd nodules, appeared as cobble-stones, on the cartilage rings situated in the anterior trachea and the mucosal surface of the epiglottis were showed. Numerous tiny nodules were scattered on the pleural surface of the lung. The vascular walls of the heart were irregular and coarse apearance with calcification. Histopathologically, nodules in the trachea represented an irregular expansion of the underlying tracheal ring with protrusion into the submucosa and consisted of proliferated and calcified cartilage and bone with marrow spaces containing numbers of hematopoietic cells. Pulmonary calcinosis and calcification of the vascular walls of the heart were observed. Our observations suggested that TOC arises form eccondroses and exostoses of the tracheal cartilage rings.

• 대한세포병리학회지
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• 제10권1호
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• pp.85-89
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• 1999

An extremely unusual case of epidermoid cyst showing diffuse parakeratosis and aggressive clinical behavior is presented. A destructive bone lesion with surrounding ill-defined soft tissue lesion was found by computed tomography in a 63 year-old man complaining of painful swelling of the right buttock. He had a history of surgical excision twice for epidermoid cysts of soft tissue of the right hip during recent one year On aspiration cytology, the aspirate was highly cellular and mostly composed of desquamated nucleated squamous cells. Operation finding revealed that the iliac bone was Irregularly destroyed and filled with gray-white cheesy material and necrotic bone bedris. Adjacent gluteus muscle showed scattered gray-white lesions. The curettage specimen showed bone necrosis and desquamated squamous cells filling the marrow spaces. The lesion within muscle revealed epidermoid cyst with diffuse parakeratosis.

• 대한세포병리학회지
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• 제16권2호
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• pp.98-101
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• 2005

Eccrine spiradenoma is a rare adnexal tumor of the skin and its cytomorphology has seldom been described in literature. To evaluate the cytologic features and diagnostic pitfalls of eccrine spiradenoma, we report a case of 33-year-old male whose clinical presentation was a painful subcutaneous mass at the right preauricular area. Fine needle aspirates revealed tight clusters of multilayered, uniform, cuboidal cells arranged around hyalinized perivascular spaces. Some epithelial cells showed tubules or rosette formations. The background showed scattered, naked nuclei. The histologic findings confirmed the eccrine spiradenoma. The recognition of peculiar cytologic features and clinical correlation could be helpful in the diagnosis of skin adnexal tumors.

• The Journal of the Acoustical Society of Korea
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• 제17권1E호
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• pp.70-75
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• 1998

The analysis of dynamic responses are carried out on several anisotropic systems due to buried pulsating line sources. These include infinite, semi-infinite spaces. The media possess orthotropic or higher symmetry. The load is in the from of a normal stress acting with parallel to symmetry axis on the plane of symmetry within the materials. The results are first derived for infinite media. Subsequently the results for semi-infinite are derived by using superposition of the solution in the infinite medium together with a scattered solution from the boundaries. The sum of both solutions has to satisfy stress free boundary conditions, thereby leading to the complete solutions. The solutions are simplified to the systems possessing of higher symmetry, such as orthotropic, transversely isotropic, cubic, and isotropic symmetry.