• ETRI Journal
• /
• 제34권5호
• /
• pp.783-786
• /
• 2012

This letter proposes a more advanced joint maximum a posteriori (MAP) adaptation using a prior model based on a probabilistic scheme utilizing the bilinear transformation (BIT) concept. The proposed method not only has scalable parameters but is also based on a single prior distribution without the heuristic parameters of the previous joint BIT-MAP method. Experiment results, irrespective of the amount of adaptation data, show that the proposed method leads to a consistent improvement over the previous method.

• 한국정밀공학회지
• /
• 제6권4호
• /
• pp.119-125
• /
• 1989

This paper presents a method of analog signal processing for a coordinate transformation. Through the proposed method, two-dimensional position information obtanided from any type of null-detector can be transformed into the information with repect to world coordinate system. In order to implement the method, a null- detection device which consists of four optical proximity sensor is developed. Through the experiments for performance evaluation, the effectiveness of the proposed method has been demonstrated.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2001년도 추계학술대회논문집 II
• /
• pp.1384-1387
• /
• 2001

Presented is a method to predict strain responses from displacement measurements on a mechanical structure. The method consists of forming a transformation matrix, which is calculated from displacement and strain modal matrices. The modal matrices can be obtained by either finite element analysis or modal testing. One disadvantage of the method is that it requires displacements on all measuring points be measured simultaneously. The strain prediction method is applied to a simple simulated system.

• 한국인쇄학회지
• /
• 제25권1호
• /
• pp.11-26
• /
• 2007

In this paper, an experiment was done where the input device used the linear multiple regression and the sRGB color space to perform a color transformation. The output device used the GOG, GOGO and sRGB for the color transformation. After the input device underwent a color transformation, a $3\;{\times}\;20\;size$ matrix was used in a linear multiple regression and the scanner's color representation of scanner was better than a digital still camera's color representation. When using the sRGB color space, the original copy and the output copy had a color difference of 11. Therefore it was more efficient to use the linear multiple regression method than using the sRGB color space. After the input device underwent a color transformation, the additivity of the LCD monitor's R, G and B signal value improved and therefore the error in the linear formula transformation decreased. From this change, the LCD monitor with the GOG model applied to the color transformation became better than LCD monitors with other models applied to the color transformation. Also, the color difference varied more than 11 from the original target in CRT and LCD monitors when a sRGB color transformation was done in restricted conditions.

• Communications for Statistical Applications and Methods
• /
• 제31권3호
• /
• pp.349-363
• /
• 2024

Compositional data refers to data where the sum of the values of the components is a constant, hence the sample space is defined as a simplex making it impossible to apply statistical methods developed in the usual Euclidean vector space. A natural approach to overcome this restriction is to consider an appropriate transformation which moves the sample space onto the Euclidean space, and log-ratio typed transformations, such as the additive log-ratio (ALR), the centered log-ratio (CLR) and the isometric log-ratio (ILR) transformations, have been mostly conducted. However, in scenarios with sparsity, where certain components take on exact zero values, these log-ratio type transformations may not be effective. In this work, we mainly suggest an alternative transformation, that is the square-root transformation which moves the original sample space onto the directional space. We compare the square-root transformation with the log-ratio typed transformation by the simulation study and the real data example. In the real data example, we applied both types of transformations to the USG% data obtained from NBA, and used a density based clustering method, DBSCAN (density-based spatial clustering of applications with noise), to show the result.

• Communications for Statistical Applications and Methods
• /
• 제16권5호
• /
• pp.781-790
• /
• 2009

본 논문에서는 퍼지수를 포함한 모수적 회귀모형을 추정하기 위하여 분포무관추정량으로 알려진 순위 변환방법과 Theil 방법을 소개한다. 순위 변환방법은 퍼지수의 ${\alpha}$-수준집합의 중심과 폭에 대한 순위를 이용하고 Theil 방법은 ${\alpha}$-수준집합의 중심과 폭에 대한 추정한 값들의 중위수를 이용한다. 예제를 이용하여 분포무관추정량으로 추정된 퍼지회귀모형의 효율성을 최소자승법과 여러 가지 방법으로 추정된 퍼지회귀모형과 비교한다.

• 정보과학회 컴퓨팅의 실제 논문지
• /
• 제20권12호
• /
• pp.646-651
• /
• 2014

히스토그램 평활화는 영상의 밝기 값 분포가 한 곳에 밀집되어 있는 경우, 출력영상의 밝기 값 범위가 지나치게 확장되어 시각적으로 부자연스러운 결과를 초래하는 단점을 가지고 있다. 그런데 감마변환은 이런 부자연스러운 현상을 비선형적 변환을 통해 보정해주는 성질을 가지고 있다. 따라서 본 논문에서는 감마변환의 이런 성질을 이용하여 영상의 화질을 개선하는 새로운 히스토그램 평활화 방법을 제안한다. 제안 방법은 먼저, 입력영상의 평균 밝기 값을 이용하여 적절한 감마변환 식을 도출하고, 입력영상의 CDF(Cumulative Distribution Function)를 도출된 감마변환 식과 선형 결합하여 새로운 CDF를 생성한 후, 새롭게 변형된 CDF를 사용하여 히스토그램 평활화를 수행한다. 실험결과 제안방법이 기존방법들에 비해 entropy, UIQ, SSIM 등과 같은 정량적 평가에서 좋은 성능을 보였고, 시각적 관점에서도 자연스럽게 화질을 개선하였다.

• 한국정보통신학회논문지
• /
• 제10권12호
• /
• pp.2187-2192
• /
• 2006

본 논문에서는 De Bruijn그래프에 기초한 다중처리기 구성 방법에 대해 논의하였다. 유한체 상의 수학적 성질과 그래프의 성질을 사용하여 변환연산자에 대해 논의하였으며, 이들 변환연산자를 이용하여 De Buijn그래프의 변환표를 도출하였다. 그리고, 이 변환표로부터 유한체 상의 De Bruijn 그래프를 도출하였다. 제안한 다중처리기는 유한체 상에서의 임의 소수와 양의 정수에 대해 구성할 수 있으며 고장허용컴퓨팅 시스템, 파이프라인 시스템, 병렬처리 네트워크, 스위칭 함수와 이의 회로, 차세대 디지털논리 시스템 및 컴퓨터 구조 등에 적 용할 수 있다.

• Journal of Microbiology and Biotechnology
• /
• 제22권9호
• /
• pp.1279-1287
• /
• 2012

We established an efficient transformation method for thermophile Geobacillus kaustophilus HTA426 using conjugative transfer from Escherichia coli of host-mimicking plasmids that imitate DNA methylation of strain HTA426 to circumvent its DNA restriction barriers. Two conjugative plasmids, pSTE33T and pUCG18T, capable of shuttling between E. coli and Geobacillus spp., were constructed. The plasmids were first introduced into E. coli BR408, which expressed one inherent DNA methylase gene (dam) and two heterologous methylase genes from strain HTA426 (GK1380-GK1381 and GK0343-GK0344). The plasmids were then directly transferred from E. coli cells to strain HTA426 by conjugative transfer using pUB307 or pRK2013 as a helper plasmid. pUCG18T was introduced very efficiently (transfer efficiency, $10^{-5}-10^{-3}\;recipient^{-1}$). pSTE33T showed lower efficiency ($10^{-7}-10^{-6}\;recipient^{-1}$) but had a high copy number and high segregational stability. Methylase genes in the donor substantially affected the transfer efficiency, demonstrating that the host-mimicking strategy contributes to efficient transformation. The transformation method, along with the two distinguishing plasmids, increases the potential of G. kaustophilus HTA426 as a thermophilic host to be used in various applications and as a model for biological studies of this genus. Our results also demonstrate that conjugative transfer is a promising approach for introducing exogenous DNA into thermophiles.

• 한국분말재료학회지
• /
• 제13권1호
• /
• pp.46-51
• /
• 2006

Through the volume change of Sn in a low-temperature phase transformation, the Sn nanopowder with high, purity, was fabricated by an economic and eco-friendly process. The fine cracks were spontaneously generated. in, Sn ingot, which was reduced to powders in the repetition of phase transformation. The Sn nanopowder with 50 run in size was obtained by the 24th repetitions of phase transformation by low-temperature and ultrasonic treatments. Also, the $SnO_2$ powder was fabricated by the oxidation of the produced Sn powder to the ingot and milled by the ultrasonic milling method. The $SnO_2$ nanopowder of 20 nm in size was fabricated after the milling for 180 h.