• Asian-Australasian Journal of Animal Sciences
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• 제20권5호
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• pp.645-652
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• 2007

The origin of domestic donkeys in China has been controversial. To clarify the origin of Chinese domestic donkeys, we investigated the partial mitochondrial D-loop sequences of 126 samples from 12 native breeds. The results revealed two mitochondrial origins, lineage Somali and lineage Nubian of African wild ass detected in Chinese domestic donkeys. Lineage Somali was predominant in Chinese domestic donkey breeds. The pattern of genetic variation in ass mtDNA D-loop sequences indicated that the two lineages Somali and Nubian from China had undergone population expansion events. In a combined analysis of lineages Somali and Nubian between previously published sequences from other countries/regions and sequences of Chinese domestic donkeys, the results indicated that the two lineages of Chinese domestic donkeys were from Africa and supported the African maternal origins of Chinese domestic donkeys. There was no obvious geographical structure in Chinese domestic donkey breeds, but the population showed abundant mtDNA diversity. The spread routes of Chinese domestic donkeys were also discussed.

• 반도체디스플레이기술학회지
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• 제14권2호
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• pp.29-34
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• 2015

Traffic lights are common in cities and are important cues for the path planning of intelligent vehicles. In this paper, we propose a robust and efficient algorithm for recognizing traffic lights from video sequences captured by a low cost off-the-shelf camera. Instead of using color information for recognizing traffic lights, a shape based approach is adopted. In learning and detection phase, Histogram of Oriented Gradients (HOG) feature is used and a cascade classifier based on Adaboost algorithm is adopted as the main classifier for locating traffic lights. To decide the color of the traffic light, a technique based on histogram analysis in HSV color space is utilized. Experimental results on several video sequences from typical urban environment prove the effectiveness of the proposed algorithm.

• 대한수학회지
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• 제51권2호
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• pp.239-250
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• 2014

Let R be a commutative Noetherian (not necessarily local) ring, I an ideal of R and M a finitely generated R-module. In this paper, by computing the local cohomology modules and Ext-modules via the injective resolution of M, we proved that, if for an integer t > 0, dim$_RH_I^i(M){\leq}k$ for ${\forall}i$ < t, then $$\displaystyle\bigcup_{i=0}^{j}(Ass_RH_I^i(M))_{{\geq}k}=\displaystyle\bigcup_{i=0}^{j}(Ass_RExt_R^i(R/I^n,M))_{{\geq}k}$$ for ${\forall}j{\leq}t$ and ${\forall}n$ >0. This shows that${\bigcup}_{n>0}(Ass_RExt_R^i(R/I^n,M))_{{\geq}k}$ is a finite set for ${\forall}i{\leq}t$. Also, we prove that $\displaystyle\bigcup_{i=1}^{r}(Ass_RM/(x_1^{n_1},x_2^{n_2},{\ldots},x_i^{n_i})M)_{{\geq}k}=\displaystyle\bigcup_{i=1}^{r}(Ass_RM/(x_1,x_2,{\ldots},x_i)M)_{{\geq}k}$ if $x_1,x_2,{\ldots},x_r$ is M-sequences in dimension > k and $n_1,n_2,{\ldots},n_r$ are some positive integers. Here, for a subset T of Spec(R), set $T_{{\geq}i}=\{{p{\in}T{\mid}dimR/p{\geq}i}\}$.

• 융합신호처리학회논문지
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• 제6권3호
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• pp.120-126
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• 2005

본 논문에서는 3차원 웨이브릿 변환을 기반으로 하고 쿼드트리 코딩 알고리즘을 이용한 동영상 압축 시스템을 제안하였다. 3차원 웨이브릿 기반 비디오 압축 시스템은 3차원 웨이브릿 변환의 움직임 보상형 시간축 필터를 이용하여 입력영상신호의 시간적 상관관계를 제거하고, 공간상의 웨이브릿 변환에 의하여 시공간의 서브밴드로 분해한다. 제안한 시스템은 3차원 웨이브릿 영상에서 에너지가 집중된 저주파 영상에 상대적으로 비트율을 높게 할당하였고, H.263 알고리즘과 비교하여 복원된 영상의 PSNR 성능을 0.64dB 향상시켰다. 또한 제안한 시스템은 3차원 웨이브릿 변환을 이용하여 움직임 보상 에러의 전파를 제거하였고, 다분해능과 압축 비트율에 따라서 점진적 전송이 가능하다.

• 한국동물위생학회지
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• 제47권1호
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• pp.9-17
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• 2024

Porcine epidemic diarrhea (PED) is a highly contagious enteric viral disease of pigs with watery diarrhea in piglets, which ultimately results in huge economic losses in the swine industry. The spike (S) protein plays an important role in viral pathogenicity, tissue tropism, infection, dissemination and the trypsin-dependent proliferation of the PED virus (PEDV). In the present study, we determined the full-length spike (S) gene sequences of twenty PEDV field strains detected in Jeonbuk province in 2022. Phylogenetic analysis showed that the twenty PEDV field strains were classified into G2b group and shared 98.6~100% of nucleotide homology and 97.4~100% of amino acid homology with each other. Mutations of amino acid sequences on the neutralizing epitope of S protein were observed in the twenty field strains compared to the previous vaccine strain SM-98-1 (G1a group). Therefore, these amino acid mutations in the PEDV S protein may result in a new genotype of the virus and highly pathogenic virus, so continuous monitoring is required.

• 정보처리학회논문지B
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• 제12B권3호
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• pp.247-256
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• 2005

컴퓨터 비젼에 관한 고전적인 연구 주제들 중의 하나는 두 개 이상의 이미지로부터 3차원 형상을 재구성하는 3차원 변환에 관한 것이다. 본 논문은 단안 카메라로 촬영한 일반적인 2차원 영상물에서 능동적으로 움직이는 3차원 영상의 깊이 정보를 추출하는 문제를 다룬다. 연속하는 프레임들간의 영상 블록의 움직임을 평가하여 카메라의 회전과 배율효과를 보상하고 다음과 같은 두 개의 단계에 걸쳐 블록의 움직임을 추출한다. (i) 블록의 위치와 움직임을 이용하여 카메라의 이동과 초점거리에 대한 전역 파라메타를 계산한다. (ii) 전역 파라메타, 블록의 위치와 움직임을 이용하여 평균 영상 깊이에 대한 상대적인 블록의 깊이를 계산한다. 다양한 동영상을 대상으로 특이점인 경우와 그렇지 않은 경우를 실험하였다. 결과로 얻어지는 상대적인 깊이 정보와 객체는 인간이 판단하는 경우와 동일함을 보였다.

• BMB Reports
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• 제38권2호
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• pp.191-197
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• 2005

Although the human genome has been nearly completely sequenced, the functions and the roles of the vast majority of the genes, and the influences of single nucleotide polymorphisms (SNPs) in these genes are not entirely known. A modified mutation detection method was developed for large-scale cloning of the possible SNPs between tumor and normal cells for facilitating the identification of genetic factors that associated with cancer formation and progression. The method involves hybridization of restriction enzyme-cut chromosomal DNA, cleavage and modification of the sites of differences by enzymes, and differential cloning of sequence variations with a designed vector. Experimental validations of the presence and location of sequence variations in the isolated clones by PCR and DNA sequencing support the capability of this method in identifying sequence differences between tumor cells and normal cells.

• 한국멀티미디어학회논문지
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• 제20권5호
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• pp.800-807
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• 2017

The Pattern Sequence-based Forecasting (PSF) is an approach to forecast the behavior of time series based on similar pattern sequences. The innovation of PSF method is to convert the load time series into a label sequence by clustering technique in order to lighten computational burden. However, it brings about a new problem in determining the number of clusters and it is subject to insufficient similar days occasionally. In this paper we proposed an adaption of the PSF method, which introduces a new clustering index to determine the number of clusters and imposes a threshold to solve the problem caused by insufficient similar days. Our experiments showed that the proposed method reduced the mean absolute percentage error (MAPE) about 15%, compared to the PSF method.

• 아시아태평양코퍼스연구
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• 제1권2호
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• pp.15-26
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• 2020

This corpus-based study investigated third language acquisition by Taiwanese college students in learning Spanish clitic pronouns at beginning and intermediate levels. It examined the acquisition sequences of Spanish clitic pronouns of the Chinese-speaking learners whose second language was English and third language was Spanish. The results indicated that indirect object pronouns (OP) preceded direct OP (case), first person preceded third person OP (person), masculine preceded feminine OP (gender), and animate preceded inanimate OP (animacy). The findings presented similar patterns as those of previous studies on English-speaking learners of Spanish. In further comparisons of the target forms in Chinese, English, and Spanish, the results suggested that L1 Chinese had strong influence on L3 Spanish, which accounts for the challenges that Taiwanese learners of Spanish face as they learn the Spanish clitic pronouns in the beginning stage.

• Journal of Ginseng Research
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• 제46권1호
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• pp.1-10
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• 2022

Ginseng has been well-known as a medicinal plant for thousands of years. Bacterial endophytes ubiquitously colonize the inside tissues of ginseng without any disease symptoms. The identification of bacterial endophytes is conducted through either the internal transcribed spacer region combined with ribosomal sequences or metagenomics. Bacterial endophyte communities differ in their diversity and composition profile, depending on the geographical location, cultivation condition, and tissue, age, and species of ginseng. Bacterial endophytes have a significant effect on the growth of ginseng through indole-3-acetic acid (IAA) and siderophore production, phosphate solubilization, and nitrogen fixation. Moreover, bacterial endophytes can protect ginseng by acting as biocontrol agents. Interestingly, bacterial endophytes isolated from Panax species have the potential to produce ginsenosides and bioactive metabolites, which can be used in the production of food and medicine. The ability of bacterial endophytes to transform major ginsenosides into minor ginsenosides using β-glucosidase is gaining increasing attention as a promising biotechnology. Recently, metabolic engineering has accelerated the possibilities for potential applications of bacterial endophytes in producing beneficial secondary metabolites.