• 한국지반공학회논문집
• /
• 제35권12호
• /
• pp.123-134
• /
• 2019

본 연구의 목적은 충격에 의한 모형 원형강관의 동적 반응을 조사하는 것이며, 선박충돌에 의한 대형원형강관의 동적 안정성 모니터링을 위한 기초연구로써 수행되었다. 실내실험은 직경, 두께, 높이가 각각 30cm, 0.4cm, 90cm인 스테인레스 재질의 단본 모형 원형강관과 3개의 세그먼트를 볼트로 조립한 모형 원형강관으로 수행되었다. 각 세그먼트의 높이는 30cm이다. 대형원형강관이 해상에 설치된 것을 모사하기 위하여 모형 원형강관을 가로, 세로, 높이가 각각 1m인 토조에 설치하였으며, 흙의 높이는 23cm로 하였다. 선박 충돌을 모사하기 위하여 모형 원형강관을 해머로 타격하였으며, 토조 내의 수위를 25cm, 40cm, 55cm, 70cm로 변화시키면서 모형 원형강관의 동적 반응 특성을 비교하였다. 실험결과, 수위가 증가할수록 측정된 신호의 에너지가 감소하였으며, 단본의 모형 원형강관보다 볼트로 조립된 모형 원형강관이 더 큰 감소폭을 보였다. 주파수 특성의 경우, 단본 모형 원형강관에서 측정된 주파수 신호는 수위가 증가할수록 우세 주파수가 감소하는 경향을 보였다. 볼트로 조립된 모형 원형강관의 경우도 수위가 증가할수록 우세 주파수가 감소하였다. 하지만, 수위에 따른 우세 주파수의 감소폭이 상대적으로 작았으며, 수위가 상부 세그먼트에 접할 때 높을 때 급격한 감소를 보였다. 본 연구의 결과는 가속도계로 측정된 신호의 에너지와 주파수 변화 특성이 해상교량기초용 가물막이 대형원형강관의 동적 안정성 모니터링에 유용하게 활용될 수 있음을 보여준다.

• 수산해양기술연구
• /
• 제50권4호
• /
• pp.556-566
• /
• 2014

Korean distant water tuna longline fishery commenced in 1966 in the Atlantic Ocean. Since then, it has become one of the most important fisheries of Korea. By early of 1970s, total amount of tuna caught in the Atlantic Ocean was the highest among other Korean distant water tuna fisheries, but has become minor since 1990s. The annual catch of tuna and tuna-like species by Korean tuna longline fishery in the Atlantic Ocean was about 1,900 mt in 2013. Bigeye tuna was the predominant species in species composition followed by yellowfin tuna, Albacore tuna, Blue shark and Swordfish. Korean distant water tuna longline fishery have mainly operated in the tropical area of the Atlantic Ocean ($20^{\circ}N{\sim}20^{\circ}S$, $20^{\circ}E{\sim}60^{\circ}W$), fishing ground was almost similar as in the previous years. The length frequency of major species (Bigeye tuna, Yellowfin tuna, Albacore tuna, Blue shark and Swordfish) were estimated. As the result of length (size) frequency data on main species caught by lonline fishery in the Atlantic Ocean, main length intervals of bigeye tuna caught in 2011, 2012 and 2013 were 120~125 cm, 160~165 cm and 130~135 cm, respectively. For yellowfin tuna, those were 125~130 cm, 150~155 cm, 145~150 cm and for albacore, 109 cm, 102 cm, 109 cm and 106 cm respectively. For swordfish caught in 2011, 2012 and 2013, main length intervals were 130~135 cm, 125~135 cm and 125~130 cm, respectively, and for blue shark, 195~200 cm in 2011 and 185~190 cm in 2012, 2013.

• 한국해안·해양공학회논문집
• /
• 제22권5호
• /
• pp.316-325
• /
• 2010

황해중부해역에 설치된 황해 모니터링 부이에서 관측한 기온과 표층수온의 변동성분을 추출하기 위하여 조화분석을 수행하였다. 분석결과, 기온과 표층 수온 모두 1년, 반년 주기성분이 가장 우세한 것으로 파악되었으며, 보다 짧은 주기성분은 $0.2{\sim}0.5^{\circ}C$ 이하의 작은 변동성분에만 기여하는 것으로 파악되었다. 한편, 기온과 표층수온의 조화분석 성분에서 추출한 잔차성분을 분석한 결과, 기온 잔차성분의 표준편차는 표층 수온 잔차성분의 표준편차보다 2.4배 정도 크고, 잔차성분의 발생빈도분포는 정규분포로 근사화하는 것이 가능한 것으로 파악되었다. 한편, 기온에 따른 표층수온 변화양상을 기온-표층수온 평면에서 분석한 결과 뚜렷한 연속적인 이력고리(hysteresis loop)를 형성하는 것이 발견되었으며, 반시계방향의 기온-표층수온 상승기, 기온-표층수온 하강기 그리고 동계 일정한 표층수온 유지기로 구성되어 있는 것으로 파악되었다.

• 한국지구과학회지
• /
• 제23권4호
• /
• pp.380-392
• /
• 2002

이 연구의 목적은 지하구조와 강진동에 의한 지반의 응답을 추정하는 데에 있어서 상시미동의 활용법을 평가하는 것이다. 이 목적을 달성하기 위하여, 상시미동의 연구현황을 검토하였으며, 여러 곳에서 측정한 상시미동을 분석하였다. 먼저 오후 10시부터 다음날 오전 6시까지 매시간 80초씩 밤에 8시간에 걸쳐 측정한 상시미동을 분석하여 상시미동의 안정성을 조사하였다. 그 결과 10Hz이하의 저주파 대역에서 상시미동 스펙트럼은 시간에 따라 대체로 변화가 없는 것으로 나타났으며, 또한 스펙트림은 지하구조에 대한 정보를 포함하고 있는 것으로 보였다. 지하구조는 상시미동 기록으로 결정한 탁월주파수로부터 추정되었으며, 이 방법으로 추정된 구조는 경주의 여러 장소에서 다른 지구물리학적 탐사에 의하여 알려진 구조와 비교되었다. 이러한 비교결과 대부분의 장소에서 두 구조는 개략적으로 일치함을 보여 주었다 상시미동의 수직성분에 대한 수평성분의 스펙트럼비(HVSR)를 이용하는 기법은 지진동에 대한 지반의 응답을 결정하는 간접적인 방법으로서 제안되어 왔다. 경주의 여러 장소에서 기록된 상시미동의 HVSR을 계산하여 지하구조가 알려진 장소에서 이론적으로 계산한 전달함수와 서로 비교해 보았다. 비교결과는 양자 사이에 스펙트럼의 최대 주파수에서 개략적인 일치를 보여 준다.

• 치과방사선
• /
• 제28권1호
• /
• pp.111-126
• /
• 1998

In this study, radiographic evaluation was made using panoramic radiography and cross-sectional tomography of SCANORA/sup (R)/ in male and female adults in their 20's on the relationship between the maxillary sinus floor and the apex of the maxillary molar, to test the accuracy and effectiveness of the cross-sectional tomography, and to use this information in the assessment of preop. and postop. root canal treatment, apical surgery, extraction and implantology. Forty-one adults with an average age of 24.4 years were studied using panoramic radiography and cross-sectional tomography. In panoramic view and cross-sectional view, the position of the apices of maxillary molars were classified as separated, contacted, or protruded type; the general shape of the maxillary sinus floor was evaluated horizontally and vertically from cross-sectional tomography. The accuracy of each radiography was tested using maxilla from 5 fresh cadavers from the Anatomy Lab at Yonsei University Dental College, and panoramic view and cross-sectional tomography were taken in the same condition as with the patients. The results were as follows: 1. Panoramic view and cross-sectional view were taken in the maxilla specimen, and the actual distance between the maxillary sinus floor and the tooth apices were measured in the specimen; the median values of the distance from the tooth apices to the maxillary sinus floor in the panoramic view, cross-sectional view and in the actual maxilla specimen were 2.83 mm, 4.51mm, and 4.l5mm, respectively. In the cross-sectional view, the measured distance was close to the actual distance but in the panoramic view, the measured distance was far from the actual distance. 2. When the results of the panoramic view and cross-sectional view were compared, 40.5％ of the results agreed with each other in the two radiographic methods and buccal roots of the 2nd molar were the closest to the maxillary sinus floor in the cross-sectional tomography. 3. In cross-sectional view, when the vertical relationship of the maxillary sinus floor and maxillary roots was assessed, in 1st molars, type II (the sinus floor that extends down to the buccolingual furcation area) was predominant, while in 2nd molars, type I (the sinus floor located above the level connecting the buccal and lingual apices) was predominant. In the horizontal relationship, in 1st molars, type II (the lowest floor of the maxillary sinus located in between the buccal and lingual roots) was predominant; in 2nd molars, type I (the lowest floor of the maxillary sinus located on the buccal side of the buccal roots) and type II appeared in similar frequency. In conclusion, the SCANORA/sup (R)/ cross-sectional tomography was more effective than the frequently used panoramic view, in that the relationship of the maxillary molars and maxillary sinus floor can be evaluated more accurately and the buccolingual cross-sectional view can also be observed. And maxillary sinus floor that was close to maxillary 2nd molar had tendency to be located on buccal side than that close to 1st molar. Therefore, cross-sectional tomography is an effective and accurate method to evaluate the position of the teeth in relation to the sinus floor preoperative and can be easily used to diagnose localized periapical lesions. Also, the image quality obtained was quite satisfactory.

• Asian-Australasian Journal of Animal Sciences
• /
• 제13권1호
• /
• pp.60-67
• /
• 2000

A survey involving 71 cattle and buffalo farming households under coconut plantations was carried out in three districts (Pannala, Bingiriya and Kuliyapitiya) with the aim of assessing the status of livestock farming. Also, 24 households (eight from each district) were visited monthly for period of one year to collect information on feeding practices. Apart from milk, animals were reared for selling, draught, bio-gas and for manure. Due to difference in system of management of cattle and buffaloes, manure from buffaloes (46%) was more frequently used for coconuts than that from cattle (10%). Majority of cattle were improved breeds (temperate origin) or their crosses, as compared to buffaloes (mainly indigenous). The most predominant management system was tethered grazing during the day, and stall feeding during the night. Coconut land (own or others) and paddy fields were the major grazing areas for the animals. The grass from coconut land was lower in crude protein (8.2%) and digestibility (48%) compared to those from paddy fields (12.1 and 57%, respectively). Of the 288 rations analysed, grass was included in 280 of the daily rations for cattle as compared to 251 for buffaloes. Straw was more commonly included in mixed rations for buffaloes (137 out of 288) than for cattle (53 out of 288). The frequency of use of straw for buffaloes was high in Pannala (75 out of 137 cases). There was wide variation among the improved breeds of cattle and buffaloes in milk production (2 to 9 litres/day), lactation length (6 to 10 months) and calving interval (13-21 months).

• Asian-Australasian Journal of Animal Sciences
• /
• 제11권4호
• /
• pp.422-427
• /
• 1998

The gene and genotypic frequencies of ${\kappa}$-casein (${\kappa}$-CN), ${\beta}$-lactoglobulin (${\beta}$-LG), growth hormone (bGH) and prolactin (bPRL) loci in Korean cattle were investigated using PCR-RFLP analyses. Genomic DNA samples were obtained from 290 cows and 30 AI bulls. In both cows and bulls, the most predominant genotypes of ${\kappa}$-CN, ${\beta}$-LG, bGH and bPRL loci were AB, BB, AA and AA, respecitively. The frequencies of A and B alleles for ${\kappa}$-CN locus were .612 and .388 for cows and .567 and .433 for bulls. The respective frequencies of A and B alleles for ${\beta}$-LG locus were .153 and .847 in cows and .217 and .783 in bulls. The frequencies of A and B alleles for bGH locus were .769 and .231 in cows and .784 and .216 in bulls, respectively. The frequencies of A and B alleles for bPRL locus were .678 and .322 for cows and .767 and .233 for bulls. Differences in frequencies of these alleles were not significant between cows and bulls at all loci examined. If the DNA polymorphisms of these candidate genes are associated with economically important traits, they could serve as genetic markers for genetic improvement in future marker-assisted selection programs in Korean cattle.

• Journal of Acupuncture Research
• /
• 제21권4호
• /
• pp.93-106
• /
• 2004

Objective: The purpose of this study is to investigate the effects of moxibustion on the stress urinary incontinence for middle-aged women. The study was performed with the nonequivalent control group non-synchronized design from April 14 thru June 16, 2003. Methods: The subjects are 60 middle-aged women with stress urinary incontinence which are composed of 30 in the experimental group and another 30 in the control group. The moxibustion procedure was applied to the experimental group in a week, and then the level of stress urinary incontinence was measured by using the revised Hendrickson's scale. Results: The results of this study are as follows: 1. Average period of stress urinary incontinence is 4.12 years, and the level of stress urinary incontinence is predominant in the mild state(63.3%), and the frequency of stress urinary incontinence is mostly 2-6 times per week(70%). 2. Hypothesis: Stress urinary incontinence will decrease for the experimental group as compared with for the control group: accepted(t=-5.113, p=0.000). Conclusion: Based on the results described above, it is considered that the moxibustion might be very effective oriental nursing intervention for improving the stress urinary incontinence for the middle-aged women.

• Molecules and Cells
• /
• 제25권1호
• /
• pp.20-29
• /
• 2008

Cytoplasmic male sterility (CMS), one of the most important traits in crop breeding, has been used for commercial seed production by $F_1$ hybrid cultivars of pepper (Capsicum annuum L.). To develop reliable molecular markers for allelic selection of the Restorer-of-fertility (Rf) gene, which is known to be a major determinant of pollen fertility restoration in peppers, a sequence of approximately 10 kb flanking an RAPD fragment closely linked to the Rf locus was obtained by genome walking. A homology search revealed that this sequence contained an LTR retrotransposon and a non-LTR LINE-like retrotransposon. Sequencing of this Rf-linked region to search for polymorphisms between a dominant and recessive allele revealed 98% nucleotide sequence identity between them. A third polymorphic haplotype of the Rf-linked sequence, which has 94-96% nucleotide sequence identity with the two previously isolated haplotypes, was identified among a large number of breeding lines. Utilizing polymorphic sequences in the haplotypes, PCR markers were developed for selection of particular haplotypes and used to examine the distribution of the haplotypes in diverse breeding lines, cultivars, and C. annuum germplasms. Surprisingly, the third haplotype was the predominant type in C. annuum germplasms, while its frequency in $F_1$ hybrid cultivars was relatively low. Meanwhile, analysis of breeding lines whose Rf allele genotypes and male-sterility phenotypes were already known revealed that the third haplotype was mainly present in exotic breeding lines that cause unstable male-sterility when combined with sterile cytoplasms.

• The Plant Pathology Journal
• /
• 제17권5호
• /
• pp.276-280
• /
• 2001

Fusarium isolates of Gibberella fujikuroi species complex were obtained from sorghum grown in five provinces of Korea in 1996 and 1997. These isolates were characterized based on their mating behavior, mycotoxin production, and vegetative compatibility. Only three mating populations (A, D, and F) were recovered from a total of 155 isolates examined. The relative frequency of the mating populations was significantly different: F was predominant (80%), while D and A were observed at low frequencies of 9% and 3%, respectively. Female fertile isolates were more common within F (44 our of 124) than D (2 out of 14), while none of the five A isolates were female fertile. The inbreeding effective population sizes ($\textrm{N}_e$)for mating type and male/hermaphrodite ratios in mating populations A and D produced significant amounts of fumonisins, while F isolates produced none or only traces of fumonisin B$_1$. In contrast. F isolates produced higher amounts of moniliformin (average of 3,820 ppm) than A and D isolates (averages of 77 and 1,819 ppm, respectively). Fifty-one isolates were tested for vegetative compatibility using nitrogen non-utilization mutants of each isolate, and 44 vegetative compatibility groups (VCGs) were identified. A single VC type (VC1) was found in all of the five A isolates examined. Six of the D isolates examined consisted of three VC types: two for VC2, two for VC3, and the rest for VC4. All of the F isolates tested were incompatible in every combination and , thus, each constituted a unique VCG.