• 반도체디스플레이기술학회지
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• 제5권2호
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• pp.19-25
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• 2006

This paper focuses on lossy medical image compression methods for medical images that operate on three-dimensional(3-D) irreversible integer wavelet transform. We offer an application of unbalanced tree structure algorithm to medical images, using a 3-D unbalanced wavelet decomposition and a 3-D unbalanced spatial dependence tree. The wavelet decomposition is accomplished with integer wavelet filters implemented with the lifting method. We have tested our encoder on volumetric medical images using different integer filters and coding unit sizes. The coding unit sizes of 16 slices save considerable dynamic memory(RAM) and coding delay from full sequence coding units used in previous works. If we allow the formation of trees of different lengths, then we can accomodate more transaxial scales than three. The encoder and decoder can then keep track of the length of the tree in which each pixel resides through the sequence of decompositions. Results show that, even with these small coding units, our algorithm with certain filters performs as well and better in lossy coding than previous coding systems using 3-D integer unbalanced wavelet transforms on volumetric medical images.

• 한국통신학회논문지
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• 제27권6A호
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• pp.562-567
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• 2002

잡음 예측 최대 유사도(noise predictive maximum likelihood, NPML) 검출기는 잡음 예측/백색화 과정을 비터비 검출기의 가지 메트릭 계산 과정에 삽입하여 데이터 검출의 신뢰성을 높이게 된다. 따라서 기존의 PRML 검출기에 잡음 예측기를 포함시킴으로써 그것의 실제 성능이 향상되고 복잡도가 줄어드는 이점이 있다. 본 논문에서는 선형 채널과 비선형 채널 하에서 랜덤 시퀀스와 런-길이 제한 (1,7) 시퀀스를 적용하여, 고밀도 수직 자기 기록 (1.7$\leq$K$_{p}$$\leq$3.0)에서 잡음 예측 PR-등화 신호에 의한 NP(1221)ML 검출 시스템이 보다 높은 타수의 PR(12321)ML 시스템보다 복잡도가 낮으면서 우월한 성능을 나타냄을 모의 실험을 통해 분석, 검증하였다.

• 한국통신학회논문지
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• 제21권11호
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• pp.2991-3000
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• 1996

이 논문에서는 DS/SS 통신 시스팀에서의 초기 동기를 위한 효율적인 신경 시스팀이 제시된다. 이 시스팀은 주어진 의사잡음 수열을 이진 필드에서 기하학적으로 분석하여 학습하는 이진 신경회로망을 사용한다. 주어진 시스팀에서의 검출 확률과 오경보 확률을 얻고 실제 모의 시험과 비교하여 구한 식을 검증한다. 또한 초기 동기 시간의 식이 유도되고 직렬 탐색의 2중 적분 시간과 비교하여 더욱 나은 성능을 가짐을 보인다. 또한 동기 수열의 길이와 갯수에 따른 시스팀의 성능을 분석하여 동기 수열의 길이를 늘릴수록, 동기 수열의 갯수를 늘릴수록 성능이 향상됨을 보인다.

• 한국양식학회지
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• 제12권2호
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• pp.91-100
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• 1999

The complete nucleotide sequence of olive flounder (Paralichthys olivaceus) hsp70-related rDNA was determined by RT- and RACE-PCR methods. A full-length of hsp70-related cDNA has an open reading frame of 1.95 kb encoding 650 amino acids with a calculated molecular weight of 71.1 kD. A corresponding hsp70-related protein contains a number of conserved elements including an ATP-binding domain, a nuclear localization signal and the carboxyl terminal motif, EEVD, which may have a role in chaperone function. Comparison of nucleotide and predicted amino acid sequence between olive flounder hsp70-related gene and hsp/hsc70 genes of other species revealed a high similarity with the cognate form of these genes. These results indicated that we recovered likely to be a olive flounder cognate hsc70 gene.

• ETRI Journal
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• 제34권4호
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• pp.511-517
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• 2012

The best linear unbiased estimator (BLUE) is most suitable for practical application and can be determined with knowledge of only the first and second moments of the probability density function. Although the BLUE is an existing algorithm, it is still largely unexplored and has not yet been applied to channel estimation in amplify and forward (AF)-based wireless relay networks (WRNs). In this paper, a BLUE-based algorithm is proposed to estimate the overall channel impulse response between the source and destination of AF strategy-based WRNs. Theoretical mean square error (MSE) performance for the BLUE is derived to show the accuracy of the proposed channel estimation algorithm. In addition, the Cram$\acute{e}$r-Rao lower bound (CRLB) is derived to validate the MSE performance. The proposed BLUE channel estimation algorithm approaches the CRLB as the length of the training sequence and number of relays increases. Further, the BLUE performs better than the linear minimum MSE estimator due to the minimum variance characteristic exhibited by the BLUE, which happens to be a function of signal-to-noise ratio.

• 한국수산과학회지
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• 제46권5호
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• pp.589-593
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• 2013

Scolecenchelys borealis was first added to the Korean fish fauna based on one leptocephalus specimen (total length (TL) 59.2 mm) collected from Dokdo, in the East Sea. Recently, however, Scolecenchelys borealis has been treated as a junior synonym of Scolecenchelys aoki, necessitating review of the scientific name S. borealis. This study describes the morphological characteristics of S. aoki based on an adult specimen (TL 230.0 mm) collected from the sea south of Korea and compares its mitochondrial DNA 12S rRNA sequence with that of the S. borealis leptocephalus. The adult S. aoki is characterized by several morphological features: vertebral formula 59-55-135; preanal lateral pores 55; infraorbital pores two; teeth on upper jaw visible externally when the mouth is closed; the dorsal fin originates just behind the anus; both jaws and vomerine teeth are conical, arranged in two rows. An analysis of an 886-base paire sequence of the 12S rRNA showed that adult S. aoki was concordant with the S. borealis leptocephalus (sensu Ji et al., 2012), indicating that both are the same species.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.117-117
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• 2017

The onion (Allium cepa L.) is the most widely cultivated species of the genus Allium, especially it has been valued because of the pungent flavor and aroma. Allium species including onion has very large genome sizes ranging from approximately 10 to 20 Gbp, which have complicated genomic studies and precluded genome sequencing until recently. A population of 186 F2 individuals derived from a cross of 'Umjinara' ${\times}$ 'Sinsunhwang' and the two parental lines were used for this study. For the development of framework map, various types of markers including SSRs, RAPD, SNPs, and CAPS makers have been used for polymorphism test. Especially, a lot of SNP and CAPS loci were developed from the onion transcriptome sequence by RNASEQ of two parental lines. The GBS libraries have been constructed based on a modified protocol from Poland Lab using a two-enzyme system. We have been developing markers showing polymorphism between two parental lines, and genotyping for all F2 individuals were finished for a number of polymorphic markers. For the construction of GBS libraries, a set of 192 barcoded adapters were generated from complementary oligonucleotides with XhoI overhang sequence and unique barcodes of length 4-8 bp and they have been tested using two parental linesto determine the optimum conditions for GBS analysis.

• Journal of Plant Biotechnology
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• 제40권1호
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• pp.27-36
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• 2013

We isolated and functionally characterized a Dendrobium Actin1 (DmACT1) promoter that drives strong gene expression in the orchid genus Dendrobium. A genomic fragment containing the region 3227 bp upstream of the coding region of DmACT1 was obtained by inverse PCR. Detailed comparison of the full-length cDNA and genomic sequences revealed that DmACT1 has a 1374 bp first intron in the 5' UTR. However, the 5' flanking sequences upstream of the coding region showed no obvious sequence similarities compared to those of known promoters, including plant actin promoters. Serial deletion constructs of the 5' flanking region from the translation initiation codon were fused to the coding sequence of a GUS/luciferase fusion reporter to identify the regulatory elements necessary for promoter activity. Transient assays in the flowers of Dendrobium revealed that the 5' UTR-intron greatly enhanced promoter activity. Moreover, the DmACT1 promoter with its 5' UTR-intron yielded approximately 10-fold higher reporter activity than the rice Act1 promoter-intron. Our data suggest that the DmACT1 promoter with its 5' UTR-intron is a useful tool for strong expression of transgenes in Dendrobium orchids.

• 한국항행학회논문지
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• 제9권2호
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• pp.140-146
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• 2005

본 논문에서는 HDR-WPAN 시스템에 적합한 주파수 옵셋 보상과 누적 위상오차를 개선할 수 있는 트래킹 알고리즘을 제안하고 이에 대해 분석하였다. 주파수 옵셋 보상 알고리즘은 CAZAC sequence의 자기상관 특성을 이용하여 각 심벌 내 샘플 간 위상오차를 통해 coarse 주파수 옵셋과 fine 주파수 옵셋을 추정하게 된다. 그러나 HDR-WPAN 시스템은 payload에 pilot 심벌이 없기 때문에 payload 길이가 길어질수록 샘플 간 미소 위상오차가 누적되어 수신단의 성상도가 회전하게 된다. 따라서 트래킹 알고리즘을 통해 틀어진 누적 위상오차를 보상해야 한다. 트래킹은 성상도내 들어온 신호가 일정 영역을 벗어나게 되면, 벗어난 만큼의 크기 ${\theta}$을 곱해 누적된 미소 위상오차를 보상하게 된다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2007년도 추계종합학술대회
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• pp.83-86
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• 2007

In the blind Maximum-likelihood (ML) detection for Orthogonal Space-Time Block Codes (OSTBC), the problem of ambiguity in determining the symbols has been a great concern. A solution to this problem is to apply semi-blind ML detection, i.e., the blind ML decoding with pilot symbols or training sequence. In order to increase the performance, the number of pilot symbols or length of training sequence should be increased. Unfortunately, this leads to a significant decrease in system spectral efficiency. This work presents an approach to resolve the aforementioned issue by introducing a new method for constructing transmitted information symbol. Thus, by transmitting information symbols drawn from different modulation constellation, the ambiguity can be easily eliminated in blind detection. Also, computer simulations are implemented to verify the performance of the proposed approach.