• 기술혁신학회지
• /
• 제3권2호
• /
• pp.1-13
• /
• 2000

This paper maps the overall features of technology valuation through a conceptional framework. The framework is composed of 4 dimensions such as basic, compositional, technical and behavioral dimension. At basic dimension, what is value and what is technology are discussed. The valuation of technology or the valuation of other assets are compared at the compositional dimension. The techniques of the valuation of technology and its difference with the valuation methods of other assets are examined at the technical dimension. The effectiveness, possibility and error of valuation are discussed at the behavioral dimension.

• 대한수학회지
• /
• 제44권3호
• /
• pp.719-731
• /
• 2007

R is called a right ${\Pi}-coherent$ ring in case every finitely generated torsion less right R-module is finitely presented. In this paper, we define a dimension for rings, called ${\Pi}-coherent$ dimension, which measures how far away a ring is from being ${\Pi}-coherent$. This dimension has nice properties when the ring in question is coherent. In addition, we study some properties of ${\Pi}-coherent$ rings in terms of preenvelopes and precovers.

• International Journal of Advanced Culture Technology
• /
• 제11권3호
• /
• pp.199-204
• /
• 2023

"New Dimension Art" is an artistic concept of the new era that the author puts forward by combining the background, the artistic environment and the artistic market.It relates to the consciousness of thought, the way of feeling, the form of expression and even the style of language in artistic creation.The author expounds this concept of art.At the same time, this paper deeply studies the characteristics of "new dimension art" by analyzing personality and commonality, as well as the creator's personality transformation.The author hopes that he and more artists can create and express more accurately through this concept, so that his works can fully reflect the author's individual characteristics and release more dimensional field energy. We are confident that this paper will affect the area of painting in the future.

• 한국어류학회지
• /
• 제18권3호
• /
• pp.209-215
• /
• 2006

한국의 퉁가리과 어류 3종의 형태학적 특성을 classical dimension과 truss dimension을 사용하여 파악하였다. Arc sin square root 전환 후, 18가지의 계측형질을 체장에 대한 비율로, 그리고 3가지의 계측형질은 두장에 대한 비율로 각각 분석하였다. 퉁사리, Liobagrus obesus는 classical dimension과 truss dimension의 4가지 계측 형질이 퉁가리, L. andersoni와 자가사리, L. mediadiposalisa에 비하여 컸다 (P<0.05). 퉁사리와 퉁가리는 truss dimension의 3가지 계측형질이 자가사리보다 컸다 (P<0.05). 조사된 퉁가리과 어류의 6가지 계측형질에서는 유의적인 차이가 없었다. 본 연구에 사용된 dimension들은 한국산 퉁가리과 어류들을 구별할 수 있는 적절한 분류학적 지표로 사용될 수 있으리라 사료된다.

• 전기화학회지
• /
• 제6권3호
• /
• pp.217-223
• /
• 2003

The present work is concerned with characterization of surface roughness and inhomogeneity of four kinds of hot-rolled carbon steels in terms of the fractal dimension and the depression parameter by using image analysis method and electrochemical impedance spectroscopy, respectively. From the analysis of the 3D AFM image, it is realized that all the hot-rolled steel surfaces show the self-affine fractal property. The values of the fractal dimension of the hot-rolled steels were determined by the analyses of the AFM images on the basis of both the perimeter-area method and the triangulation method. In addition, the Nyquist plots were found to be depressed from a perfect semicircle form. From the experimental findings, the changes in the values of the fractal dimension and the depression parameter with chemical composition have been discussed in terms of the change in the value of hardness of base steel.

• 대한수학회보
• /
• 제61권3호
• /
• pp.735-744
• /
• 2024

In this note, we shed new light on Krull domains from the point view of Gorenstein homological algebra. By using the so-called w-operation, we show that an integral domain R is Krull if and only if for any nonzero proper w-ideal I, the Gorenstein global dimension of the w-factor ring (R/I)_w is zero. Further, we obtain that an integral domain R is Dedekind if and only if for any nonzero proper ideal I, the Gorenstein global dimension of the factor ring R/I is zero.

• 한국측량학회지
• /
• 제21권1호
• /
• pp.81-87
• /
• 2003

Web 기반 네트워크 환경에서 3차원의 실세계를 파악하는 것은 매우 어려운 과제이다. 그러나 최근의 시뮬레이션 도구들은 여러 가지 3차원 구현 기술들을 접목하여 제한된 2차원 화면 속에서 3차원 요소들을 효율적으로 구현시켜 나가고 있는 추세이다. 많은 GIS 도구들이 3차원 자료 생성을 위한 훌륭한 기능들을 제공하고 있다. 그러나 웹 환경에서 가상현실기법을 이용한 3차원 CIS의 설계에 대한 연구는 미진한 상태이다. 그래서 이 연구에서는 고가의 Map전용 프로그램의 지원 없이 웹상에서 원하는 방향, 시점에 대한 시각적 정보를 제공할 수 있는 능동적 3차원 VR지도를 제작하기 위해 가상현실모델링언어를 이용하여 3차원 지형 Map을 구현하였으며, 이러한 3D Web-Map은 차세대 지도매체로서 그 가능성이 충분하다고 여겨진다.

• Structural Engineering and Mechanics
• /
• 제20권3호
• /
• pp.265-277
• /
• 2005

This paper is focused on fractal analysis of the surface cracking, a new tool for safety evaluation of corroded reinforced concrete (RC) beams. Comprehensive experimental investigations, including flexural tests, coupon tests on strength evaluation of corroded concrete and rusty rebar, and pullout tests to determine bond strength between concrete and rebar were carried out on nine Corroded Reinforced Concrete Beams (CRCB) exposed to an aggressive environment for more than 10 years. In combination with test results from a previous study on CRCBs fabricated in the laboratory from accelerated methods, it is found that, for both types of beams, the surface cracking distributions are fractal in character at loading and failure stages. Fractal dimension is calculated for all specimens at different corrosion states based on fractal analysis method. Relationships between the fractal dimension and mechanical properties of corroded concrete, rebar corrosion ratio, and ductility of CRCBs are discussed in detail. It is concluded that the fractal dimension can act as a damage index and can be efficiently used to describe the corrosion state of CRCBs.

• 한국발생생물학회지:발생과생식
• /
• 제20권2호
• /
• pp.51-63
• /
• 2016

The landmark-based morphometric and meristic analysis of the kelp grouper (Epinephelus bruneus), red spotted grouper (E. akaara) and seven-banded grouper (E. septemfasciatus) were performed to compare the differentiation of overall body shape and structure. The measurements of the morphometric dimensions were observed in 25 parts (truss dimension: 16 parts; head part dimension: 9 parts) of 38 morphometric dimensions and also meristic differences observed in 3 parts (dorsal fin, anal fin and caudal fin) of 6 meristic counts (P < 0.05). Observed morphometric characteristics primarily involved in truss and head part dimension, kelp grouper have larger values in caudal part of truss dimension, kelp grouper, red spotted grouper and seven-banded grouper have similar values in pectoral part of truss dimension, in addition to, results of head part dimension showed that red spotted grouper have smaller values in overall dimensions (P < 0.05). As meristic characteristics, kelp grouper have more number of anal fin rays than other fish, red spotted grouper have more number of dorsal soft rays than other fish, and seven spotted grouper have more number of anal soft rays, and caudal fin rays than other fish (P < 0.05). Photographed under the x-ray, kelp grouper have the most curved vertebral column and largest swim bladder than other fishes (P < 0.05). Our results of this study confirmed that 3 subfamily fishes adequately can distinguish with external body shape, and we hope that the results of our study could be used to identify in Serranidae family as taxonomical parameters.

• 소성∙가공
• /
• 제13권1호
• /
• pp.3-8
• /
• 2004

The improvement of dimensional accuracy for forged part is one of major goals in cold forging industry. There are many problems in controlling the dimension by the trial-and-error, especially for a precision forged gear. A FEM analysis has been used in developing the forging technology. However, FE techniques have to be reconfirmed for predicting accurately the dimension of forged part. In this study, the effects of elastic characteristics and temperature changes are investigated by the comparisons between experimental and FEA in cold forging. When FE models related with elastic characteristics are considered practically, FE results could predict the part dimension within the range of $10\mu\textrm{m}$. And if thermal effects also are considered additionally, the predicted dimensions are well coincided with the experimental down to about $5\mu\textrm{m}$.