• Journal of Advanced Marine Engineering and Technology
• /
• 제35권8호
• /
• pp.1028-1034
• /
• 2011

본 논문에서는 파도의 상하운동에너지의 이용효율을 높이기 위해서 부양체와 2 D.O.F.(자유도) 진동발전시스템을 일체로 구성한 파력진동발전시스템을 제안한다. 파도가 갖는 상하운동 주파수 중 속도 에너지가 큰 주요 주파수 ${\omega}_1$, ${\omega}_2$을 선정하고, 2 D.O.F. 파력진동발전시스템의 고유진동수와 선정된 주파수들을 일치시킨다. 그러면 공진효과에 의해 각각의 질량과 권선사이의 상대속도가 파도의 상하운동속도보다 커진다. 또한 2 D.O.F. 진동시스템의 연성효과로 인한 1 D.O.F. 파력진동발전시스템보다 더 많은 전기에너지를 얻을 수 있다. 따라서 본 논문에서 제안한 2 D.O.F. 파력 발전시스템은 파도가 갖는 에너지를 더 많이 이용할 뿐만 아니라 더 많은 전기에너지를 얻을 수 있는 장점을 가짐을 알 수 있었다.

• 생명과학회지
• /
• 제7권4호
• /
• pp.355-357
• /
• 1997

대립종자와 소립종자의 cross부터 F$_{2}$와 F$_{3}$ 세대에서의 종자크기에 대한 빈도분포의 다음과 같다. 두 세대에서 모본의 크기와 같은 progeny는 나타나지 않았으며 각 세대의 평균치는 양 모본의 평균치 보다 낮았다. 소립종자 크기에 비해 우성적인 유전양상을 나타 내었다.

• Plant Resources
• /
• 제3권3호
• /
• pp.184-193
• /
• 2000

Soybean [Glycine max (L.) Merr.] seed weight is a important trait in cultivar development. Objective of this study was to identify and confirm quantitative trait loci (QTLs) for seed weight variation in the F2 and F2:3 generations. QTLs for seed weight were identified in F2 and F2:3 generations using interval mapping (MapMaker/QTL) and single-factor analysis of variance (ANOVA). In the F2 plant generation (i.e., F3 seed), three markers, OPL9a, OPM7a, and OPAC12 were significantly (P<0.01) associated with seed weight QTLs. In the F2:3 plant row generation (i.e., F4 seed), five markers, OPA9a, OPG19, OPL9b, OPP11, and Sat_085 were significantly (P<0.01) associated with seed weight QTLs. Two markers, OPL9a and OPL9b were significantly (P<0.05) associated with seed weight QTLs in both generations. Two QTLs on USDA soybean linkage group C1 and R were identified in both F2 and F2:3 generations using interval mapping. The linkage group C1 QTL explained 16% of the variation in seed weight in both generations, and the linkage group R QTL explained 39% and 41% of the variation for F2 and F2:3 generation, respectively. The linkage group C2 QTL identified in F2:3 generation explained 14.9% of variation. Linkage groups C1, C2 and R had previously been identified as harbouring seed size QTLs. The consistency of QTLs across generations and populations indicates that marker-assisted selection is possible in a soybean breeding program.

• 대한음성학회지:말소리
• /
• 제35_36호
• /
• pp.131-143
• /
• 1998

This study describes an algorithm for the F0 contour generation system for Korean sentences and its evaluation results. 400 K-ToBI labeled utterances were used which were read by one male and one female announcers. F0 contour generation system uses two classification trees for prediction of K-ToBI labels for input text and 11 regression trees for prediction of F0 values for the labels. Evaluation results of the system showed 77.2% prediction accuracy for prediction of IP boundaries and 72.0％ prediction accuracy for AP boundaries. Information of voicing and duration of the segments was not changed for F0 contour generation and its evaluation. Evaluation results showed 23.5Hz RMS error and 0.55 correlation coefficient in F0 generation experiment using labelling information from the original speech data.

• 생명과학회지
• /
• 제7권4호
• /
• pp.358-360
• /
• 1997

대두 종자크기에 대한 QTL의 consistency을 알아보기 위하여 F$_{2}$, F$_{3}$ 세대에서의 분석결과를 요약하면 댜음과 같다. 세 개의 마크 OTL09a, OPM07a, OPAC12 가 F$_{2} 세대에서 종자 크기에 대한 QTL과 높은 유의성을 나타내었고, F$_{3}$ 세애데는 네 개의 마크 OTL09a, OPG19a, OPL09b, OPP11가 유의성을 나타내었다. 두 개의 마크 OPL09a, OPL09b 가 두 세대에서 유의성을 나타애어 종자 크기에 대한 QTL의 consistency가 인정되었다.

• 말소리와 음성과학
• /
• 제9권2호
• /
• pp.39-51
• /
• 2017

The current study aims to investigate the effect of sociolinguistic factors such as region, generation and gender on the acoustic properties of Korean high and mid back vowels. We analyzed the vowel productions of one hundred twenty-eight subjects from the Korean Standard Speech Database, chosen to represent the different possible combinations of region, generation, and gender. The results reveal a chain-like shift in the back vowels. Unlike previous studies that have reported /o/-/u/ becoming closer as a result of a decreasing F1 in /o/, we found that the distance between the two vowels is decided more by the changing F2 in /u/. Also, the F2 of /u/ and /ɯ/, and the F2 of /ʌ/ and F1 of /o/ appear to move in tandem. Lastly, this study suggests that the reason the vowel changes differ across gender and regional dialects could be because they are all converging on to the standard Korean.

• 한국잠사곤충학회지
• /
• 제31권1호
• /
• pp.25-36
• /
• 1989

누에 품종 육성을 위한 기초자료를 얻기 위해 7개 품종을 이면교잡하여 얻은 F1, F2세대에 대한 유전자의 분포상태와 우성정도, 분산성분과 성분비 등을 분석한 결과를 요약하면 다음과 같다. Vr-Wr graph는 F1세대에서 견장의 자, 단견중의 자웅, 견층 연감율의 자웅, 견사량이 모두 초우성이었다. 또 5령경과와 견층중, 견층비율의 각 자웅, 견사장 등은 불완전 우성으로 표현되었다. F2세대는 5령경과, 전령경과와 견장, 견폭, 단견중, 견층중, 견사량은 모두 불완전 우성으로 나타났다. 유전 분산성분에서 F1세대의 5령경과와 견폭, 견층중, 견층비율, Fibroin량의 각 자웅은 유전지의 상가적 효과가 우성 효과보다 크게 평가되었다. F2세대의 견촉, 견층중, 견층비율, fibroin량의 각 자웅도 상가적 효과가 우성 효과보다 크게 표현되었다.

• 한국육종학회지
• /
• 제43권2호
• /
• pp.120-125
• /
• 2011

A field experiment was conducted to examine the fruit quality characters in second generation ($F_2$) hybrid cultivar and to compare the fruit characters with original $F_1$ hybrid cultivar of minipaprika (yellow and orange type) at the Research Farm, Hwacheon in July, 2010. Fruit characters varied within $F_2$ population of each minipaprika type. In minipaprika yellow, fruit weight varied from 12.2 g to 50.8 g (average 28.5 g) and fruit length/width varied from 1.4 to 2.8 (average, 2.0). Pericarp thickness ranged from 1.8 mm to 4.1 mm (average, 2.9 mm). Total soluble solid (TSS) varied from $6.2^{\circ}Brix$ to $13.5^{\circ}Brix$ with an average of $8.7^{\circ}Brix$. Fruit volume varied from 10.3 cc to 46.7 cc with an average of 24.4 cc. In minipaprika orange type, fruit weight ranged from 19.7 g to 42.4 g (average, 29.0 g) and fruit length/width varied from 1.5 to 2.6 (average, 2.0). Pericarp thickness varied from 2.1 mm to 4.1 mm with an average of 3.0 mm. TSS varied from $5.0^{\circ}Brix$ to $12.2^{\circ}Brix$ (average, $7.9^{\circ}Brix$) and average fruit volume was 24.6 cc ranging from 10.7 cc to 35.0 cc. The average fruit quality characters in $F_2$ population in both yellow and orange minipaprika did not differ from their $F_1$ hybrid parent and $F_2$ seed can be an additional way to supply high yielding hybrid cultivars at lower cost to the minipaprika growers.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2006년도 춘계학술대회논문집
• /
• pp.680-685
• /
• 2006

This paper describes the aeroelastic stability test of the small-scaled 'Next-Generation Blade(NRSB)' with NRSH (Next-Generation Hub System) and HCTH hingeless hub system in hover and forward flight conditions. Excitation tests of rotor system installed in GSRTS(General Small-scale Rotor Test System) at KARI(Korea Aerospace Research Institute) were tarried out to get lead-lag damping ratio of blades with flexures as hub flexure. MBA(Moving Block Analysis) technique was used for the estimation of lead-lag damping ratio. First, NRSB-1F blades with HCTH hub system, Then NRSB-1F with NRSH hub system were tested. Second, NRSB-2F blades with NRSH hub system were tested. Tests were done on the ground and in the wind tunnel according to the test conditions of hover and forward flight, respectively. Non-rotating natural frequencies, non-rotating damping ratios and rotating natural frequencies were showed similar level fir each cases. Estimated damping ratios of NRSB-1F, NRSB-2F with HCTH and NRSH were above 0.5%, and damping ratio increased by collective pitch angle increasement. Furthermore damping ratios of NRSB-2F were higher than damping ratios of NRSB-1F in high pitch angle. It was confirmed that the blade design for noise reduction would give observable improvement in aeroelastic stability compared to paddle blade and NRSB-1F design.

• 한국소음진동공학회논문집
• /
• 제16권8호
• /
• pp.848-856
• /
• 2006

This paper describes the aeroelastic stability test of the small-scaled 'Next-generation Blade(NRSB)' with NRSH (next-generation hub system) and HCTH hingeless hub system in hover and forward flight conditions. Excitation tests of rotor system installed in GSRTS (general small-scale rotor test system) at KARI (Korea Aerospace Research Institute) were carried out to get lead-lag damping ratio of blades with flexures as hub flexure. MBA(moving block analysis) technique was used for the estimation of lead-lag damping ratio. First, NRSB-1F blades with HCTH hub system, then NRSB- 1F with NRSH hub system were tested. Second, NRSB-2F blades with NRSH hub system were tested. Tests were done on the ground and in the wind tunnel according to the test conditions of hover and forward flight, respectively. Non-rotating natural frequencies, non-rotating damping ratios and rotating natural frequencies were showed similar level for each cases. Estimated damping ratios of NRSB-1F, NRSB-2F with HCTH and NRSH were above 0.5%, and damping ratio increased by collective pitch angle increasement. Furthermore damping ratios of NRSB-2F were higher than damping ratios of NRSB-1F in high Pitch angle. It was confirmed that the blade design for noise reduction would give observable improvement in aeroelastic stability compared to paddle blade and NRSB-1F design.