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Comparison of the DGPS Positioning Accuracies for Single and Multiple Reference Stations in the South Coast of Korea (한국 남해안에서 단일 및 복수 기준국에 의한 DGPS의 측위정도 비교)

  • Park, Noh-Seon;Shin, Hyeong-Il;Lee, Dae-Jae;Shin, Hyeon-Ok;Kim, Seok-Jae;Bae, Mun-Ki
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.38 no.3
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    • pp.181-189
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    • 2002
  • This paper describes the positioning accuracies for single and multiple reference stations at fixed stations in Yosu harbor and Pukyong National University in the south coast of Korea from Jan. to Oct. 2001. Also we observed the change of positioning accuracy during a day and the available range of the DGPS reference station. he results obtained are main summarized as follows; 1. With single DGPS reference station, 2drms and the average positioning .error were 5.6m, 7.3m respectively. Measurement positions indicated an incline toward one way away from the actual position. 2. With multiple DGPS reference stations, 2drms and the average position error were 5.5m, 3.2m for the arithmetic mean, respectively. They were 5.3m, 3.8m for the weighted average, respectively. As far as the separation between the user and the reference station, using multiple reference stations improved position accuracy more than using single reference station. 3. The average positioning error increased between 16: 00 and 22 : 00. The average number of observed satellite and HDOP were 7.1m, 0.49 respectively. 4. Coverage of DGPS reference stations in the south coast of Korea was estimated to be 110nm. Signal strength and signal to noise ratio was not available the DGPS signal below 19㏈, 8㏈ respectively.

Analysis of Genetic Diversity of Apple Cultivars Using RAPD and SSR Markers (RAPD와 SSR 마커를 이용한 사과 품종의 유전적 다양성 분석)

  • Cho, Kang-Hee;Heo, Seong;Kim, Jeong-Hee;Shin, Il Sheob;Han, Sang Eun;Kim, Se Hee;Kim, Dae-Hyun;Kim, Hyun Ran
    • Korean Journal of Breeding Science
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    • v.42 no.5
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    • pp.525-533
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    • 2010
  • In this study, random amplified polymorphic DNA (RAPD) and simple sequence repeat (SSR) analyses were utilized for evaluation of genetic diversity of 34 Korean bred and introduced apple cultivars. Thirty-seven RAPD primers detected a total of 193 polymorphic bands (36.2%) with an average of 5.6. Twenty-six SSR markers generated a total of 112 alleles with an average 4.3 alleles per locus. Genetic diversity of 34 cultivars estimated by polymorphic information content (PIC) value ranged from 0.536 (CH03d12) to 0.952 (CH04c06) with an average of 0.843. By UPGMA (unweighted pair-group method arithmetic average) cluster analysis with 305 polymorphic bands, the apple cultivars were classified four groups by similarity index of 0.640. The 'Seokwang' was included in group I. Group II consisted of 12 cultivars which have 'Golden Delicious' in their pedigree, with the exception of 'Spur Earliblaze' and 'Jonathan'. Group III included 13 cultivars which have usually 'Fuji' in their ancestry and bud sport of 'Fuji' cultivars. Group IV consisted of 8 cultivars with 'Hongro', 'Gamhong', and 'Saenara'. Similarity values among the tested apple cultivars ranged from 0.529 to 0.987, and the average similarity value was 0.647. The similarity index was the highest (0.987) between 'Hwarang' and 'Danhong', and the lowest (0.529) between 'Seokwang' and 'Hwarang'. The genetic relationships among the 34 studied apple cultivars were basically consistent with the known pedigree.

Study on Ego states in the view of Transactional analysis, Coping style and Health states of Nursing Students (상호교류분석으로 본 간호학생의 자아상태와 스트레스 대처방법 및 건강상태에 관한 연구)

  • Won, Jeong-Sook;Kim, Jeong-Hwa
    • Journal of East-West Nursing Research
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    • v.7 no.1
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    • pp.68-81
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    • 2002
  • The purpose of this study is to analyze the type of ego states and stress coping style on female college students who are in the course of nursing study. This study is performed in the view of Transactional Analysis and designed to scrutinize descriptive correlations between the type of ego states and stress coping style. The subject is consists of 144 freshmen and sophomore, 138 junior and senior students group, who are students of K nursing college located in Seoul. The sampling investigation period is on Sept. 14, 2002 to Oct. 26, 2002. The measuring instrument used for Transactional Analysis ego state is 50 items Ego-gram research paper devised by Dusay(1997). For studying coping style, Folkman & Lazarus's measurement(1984) was adopted, which is translated and modified by Han, and Oh,(1990). Health states is adopted by standardized health inspecting instrumental table (Cornell Medical Index:CMI) which is designed for Korean people by Ko and Park(1980) Statistic average and standard deviation were generated by using SPSS PC+, t=test and Pearson correlation. The results were as follows: 1) In the type of ego states on both groups indicated the arithmetic apex NP(maximum value), then the point A was high and the data made a down slope to point AC. In the comparison to type of ego states between two groups, only at point CP, the data value of upper year students represented higher than that of lower year ones by c(t=2.28, p=.023). 2) Stress coping style of whole students were highly and affirmatively dedicated to research. Especially hopeful aspect(t=.67, p=.05), relaxation of tension(t=-2.16, p=.03) made significant difference each other in the view of arithmetic calculation. 3) In view of nursing students' physical health states, there is significant difference in past history(t=2.50, p=.013) and in case of mental health states, there are considerable discrepancies between lower group(73.52) and upper group(75.11)(p<.05). In view of all field, state of tension(t=2.13, p=.048) has difference. 4) While verifying coping style in terms of ego states level between lower and upper students group, In type CP, high level ego states group indicated significant difference on stress coping style area than low leveled group and made such sequences as the central point of problem, In type NP, sequences such as the central point of problem, In type A, the central point of problem, In type FC, hopeful aspect and In type AC, hopeful aspect and indifference were derived significantly different (p<.05). 5) While verifying health state differences in the level of lower and upper ego states, In type FC, low level group(150.29) marked higher point than upper group(145.19), there is remarkable discrepancy and so did whole health state(p=.014), In type AC both mental state(p=.000) and whole health state (p=.015) showed differences. 6) When analyzing correlations between whole students' ego states, copying style and health state, all type of ego state showed differences(p<.001). In correlations between ego state and health state, in type FC physical state had an apex and there are inverse correlations among the other types. Especially, type FC showed inverse correlations with great discrepancies(p<.05). In mental state, type NP(${\gamma}=.198$, p<.001) and type A(${\gamma}=.166$, p<.05) represented straight correlations with remarkable differences. Especially, In type AC showed inverse correlations(${\gamma}=.282$, p<.001). In case of correlations between copying style and health state, indifference(${\gamma}=-.157$) and relaxation of tension(${\gamma}=-.158$) presented great difference(p<.05). In mental state, central point of problem and search for social support showed straight correlations with great discrepancies(p<.05), hopeful aspect and indifference showed inverse correlations with considerable differences(p<.001).

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Evaluation of Genetic Diversity among Persimmon Cultivars (Diospyros kaki Thunb.) Using Microsatellite Markers (초위성 마커를 이용한 감(Diospyros kaki Thunb.)의 유연관계 분석)

  • Hwang, Ji-Hyeon;Park, Yu-Ok;Kim, Sung-Churl;Lee, Yong-Jae;Kang, Jum-Soon;Choi, Young-Whan;Son, Beung-Gu;Park, Young-Hoon
    • Journal of Life Science
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    • v.20 no.4
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    • pp.632-638
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    • 2010
  • The genetic diversity among 48 persimmon (Diospyros kaki Thunb.) accessions, indigenous in Korea and introduced from Japan and China, was evaluated by using simple sequence repeat (SSR) markers. From 20 SSR primer sets, a total of 114 polymorphic markers were detected among 12 pollination-constant non-astringent (PCNA), 13 pollination-variant non-astringent (PVNA), 15 pollination-variant astringent (PVA), and 8 pollination-constant astringent (PCA) cultivars. Analysis of pair-wise genetic similarity coefficient (Nei-Li) and unweighted pair-group method with arithmetic averaging (UPGMA) clustering revealed two main clusters and four subclusters for cluster I. The subclustering pattern was in accordance with the classification of persimmon cultivars based on the nature of astringency loss. Phenetic relationships among the subclusters showed a closer relatedness of the PCNA group with the PVNA group, and the PVA with the PCA group. Genetic similarity co-efficiency was 0.499 on average and the highest (0.954) similarity was observed between 'Cheongdo-Bansi' and 'Haman-Bansi'. The similarity was lowest (0.192) between 'Damopan'and 'Atago'. Identification of each cultivar with the execption of 'Cheongdo-Bansi' and 'Gyeongsan-Bansi' was possible based on the SSR fingerprints, suggesting that these SSR markers are a useful tool for protecting intellectual property on newly developed cultivars.

Analysis of Microsatellite Loci for Swimming Crab Portunus trituberculatus Populations in the Korean Side of the Yellow Sea (서해안에서 채집된 꽃게(Portunus trituberculatus) 집단에 대한 microsatellite 좌위의 분석)

  • Lee, Hye Jin;Yoon, Seong Jong;Hyun, Young Se;Kim, Hye Jin;Hwang, Sung-Il;Bae, Joo-Seung;Chung, Ki Wha
    • Journal of Life Science
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    • v.23 no.9
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    • pp.1088-1095
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    • 2013
  • The swimming crab, Portunus trituberculatus, inhabits seafloor habitats containing sand or pebbles and is widely distributed throughout the world. The present study investigated genetic polymorphisms of 10 microsatellites in 281 samples of P. trituberculatus collected from four locations along the coastal water of the Korean side of the Yellow Sea (Yeonggwang, Taean, Sorea, and Yeonpyeong-do Island). The number of alleles per locus ranged from 50 to 129, with a mean of 69.5. The observed and expected hetrozygosity varied from 0.111 to 1.000 and from 0.609 to 0.979, respectively. The inbreeding coefficients (Fis) varied among the loci from -0.0207 to 0.8175. The genetic differentiation (Fst) was less than 0.05 (range 0.0020-0.0124). Therefore, the four groups of P. trituberculatus appeared to exhibit little genetic differentiation. The lack of differentiation was confirmed in a phylogenetic tree constructed by the unweighted pair group method with the arithmetic average (UPGMA). The hypervariation between the populations and the lack of genetic differentiation may reflect active gene flow among the Yellow Sea populations and the absence of geographical boundaries. The highly polymorphic microsatellite loci will be useful for molecular and phylogenetic studies, as well as stock management, of swimming crab, which is an important fishery resource.

Studies on Benzo(a)pyrene of the Suspended Particulate in Atmosphere of Seoul City (서울시(市) 대기중(大氣中) 유해(有害) 부유분진(浮遊粉塵) 성분(成分)에 관(關)한 조사연구(調査硏究) -부유분진중(浮遊粉塵中)의 Benzo(a)pyrene에 관(關)하여-)

  • Kwon, Sook-Pyo;Chung, Yong;Lim, Dong-Koo
    • Journal of Preventive Medicine and Public Health
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    • v.11 no.1
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    • pp.65-75
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    • 1978
  • This study was carried out to investigate air pollution by total suspended particulate(T.S.P.), benzene soluble matter and benzo(a) pyrene in Seoul city. The sampling areas were divided into commercial(Kwang Hwa Moon), indus-trial(Ku Ro Dong) and residensial area(Shin Chon). Sampling was undertaken by High Voulme Air Sampler for four seasons from January 1917 to November 1977. The T.S.P. was extracted with Soxhlet apparatus by benzene and benzo(a) pyrene was separated by column chromatography and thin layer chromatography. The concentrations of benzo(a) pyrene were measured by means of fluorophotometer, and following results were obtained. 1. Arithmetic average concentration for 1-day averaging time of total suspended particulate were $275.6ug/m^3$ in Kwang Hwa Moon, $325.9ug/m^3$ in Ku Ro Dong and $193.0ug/m^3$ in Shin Chon. 2. The seasonal variance of total suspended parti-culate at Ku Ro Dong and Shin Chon were $102.7ug/m^3\;99.6ug/m^3$ respectively and at Kwang Hwa Moon $39.9ug/m^3$. And the concentration of autumn is higher than of that spring at Ku Ro Dong and at Shin Chon, but at Kwang Hwa Moon, the seasonal variance is very little. 3. The concentrations of 50% frequency from geometric mean for 1-day averaging time were $264ug/m^3,\;300ug/m^3\;and\;178ug/m^3$ at Kwang Hwa Moon, Ku Ro Dong and Shin Chon. And geometric standard deviation were 1.27, 1.38 and 1.41 respectively. 4. The concentrations of benzene soluble mater were $26.9ug/m^3$ at Kwang Hwa Moon, $22.7ug/m^3$ at Ku Ro Dong and $15.5ug/m^3$ at Shin Chon, and the ratios to the T.S.P. were 9.8%(range 5.6-14.8%), 7.0%(range 2.4-14.4%) and 8.0%(range 5.5-22.1%) respectively. 5. The concentrations of benzo(a) pyrene were $8.5ug/m^3$ (range $0.8-29.9ug/m^3$) at Kwang Hwa Moon $10.9ug/m^3$(range $1.1-52.0ug/m^3$) at Ku Ro Dong and $5.8ug/m^3$(range $1.5-11.4ug/m^3$) at Shin Chon. 6. The results of this investigation were relatively high in compared with the recommended standards of suspended particulate in air of U.S. Environmental Protection Agency and observed levels of benzo(a)-pyrene in U.S. city.

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Characteristics of Musim Stream by Surveyed Sites Based on EPT-group of Aquatic Insects1a (수서곤충 EPT-group을 이용한 무심천의 조사지점별 특성)

  • Shin, Hyun-Seon;Mitamura, Osamu;Kim, Sook-Jung;Choi, Jun-Kil
    • Korean Journal of Environment and Ecology
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    • v.22 no.4
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    • pp.420-426
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    • 2008
  • This study compared and analyzed EPT ratio, EPT richness and EPT number(number of species and individuals) of a total of 9 selected sites individually using EPT-group of aquatic insects in Musim stream, also compared similarity ratio between the sampling sites using UPGMA(Unweighted Paired Group Method using Arithmetic average) based on analysis subsequent to species structure of aquatic insects, and compared and analyzed a functional feeding groups(FFGs) of aquatic insects based on stream order. As a result, the aquatic insect group of 2,269 individuals is classified as 71 species, 36 families, and 8 orders, and EPT ratio and EPT richness at sites 3(0.72 and 3.89, respectively) were found to be relatively higher than those at the other sites; by contrast, those at site 9(0.03 and 0.09, respectively) were relatively low. EPT number of species and individuals was found to be lowest at site 9. As a result of UPGMA analysis, the sampling sites in Musim stream were divided into three groups, including A1(site 1, 7, 8), A2(site 2, 3, 4, 5, 6) and B(site 9). According to the results of FFGs, there was not shown specific difference in the number of functional feeding groups by each sites; however, there appeared a little more shredders and scrappers in the upper and mid stream comparing to other sampling sites while collector-filterers and collector-gatherers were found to be dominant in number in the lower stream. According to this research result, the sampling sites in Musim stream were found to have an effect on not only EPT richness, EPT ratio, and EPT number but also FFGs structure.

2D AND 3D STRUCTURAL STUDY OF RETE RIDGE IN ORAL MUCOSA AND SKIN PADDLE OF VARIOUS FREE FLAPS (구강내 점막과 유리피판에 사용되는 피부의 rete ridge에 관한 2차원 및 3차원적 구조 연구)

  • Ahn, Kang-Min;Chung, Hun-Jong;Kim, Yoon-Tae;Paeng, Jun-Young;Shin, Young-Min;Sung, Mi-Ae;Park, Hee-Jung;Myoung, Hoon;Hwang, Soon-Jung;Choi, Jin-Young;Choung, Pill-Hoon;Kim, Myung-Jin;Lee, Jong-Ho
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.31 no.2
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    • pp.143-149
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    • 2005
  • Objects : With the advancement of tissue engineering techniques, the effort to develop bioartificial mucosa have been actively delivered. The problem we met with this technique is the lack of mechanical strength between kerationocyte layer and dermal layer, where in the normal skin and mucosa, they are tightly bound with rete ridge structure. The purpose of this study is to understand the 2D and 3D structure of rete ridge of mucosa and skin paddle for rendering more biomimetic structure to the artificial mucosa. Materials and Methods : Oral mucosa and skin from the patients who received the oral surgery and maxillofacial reconstruction were harvested. The epidermis was separated from the dermis after treating with dispase for 12-16 hours. H&E staining was performed for 2D(dimensional) structure study and confocal LASER and SEM study were performed for 3D structure. Mean height(Sc) and arithmetic mean deviation(Sa) of all surface height were calculated. Results : The average height of rete ridge of skin flap was between $67.14{\mu}m$ and $194.55{\mu}m$. That of oral mucosa was between $146.26{\mu}m$ and $167.51{\mu}m$. Pressure bearing area and attached gingiva of oral mucosa showed deeper rete ridges. Conclusion : To obtain the adequate strength of artificially cultured keratinocyte skin and mucosa flap, it is necessary to imitate the original skin and mucosa structure, especially rete ridge. Through this study, 2D and 3D rete ridge structure of normal mucosa and skin was obtained. These results can be used as basis for substrate morphology for keratinocytes culture.

Study on the shrinkage properties of commercial hardwoods (유용(有用) 활엽수재(闊葉樹材)의 수축(收縮)에 관(關)한 연구(硏究))

  • Kim, Young-Suk;Lee, Won-Yong
    • Journal of the Korean Wood Science and Technology
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    • v.4 no.1
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    • pp.8-14
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    • 1976
  • The capacity of wood to shrinkage is very important as the basis data for wood industry but there is no such data available as yet in Korea. So this article, as a study on forest biological, were made to determine the shrinkage properties of commercial hardwoods in Korea. The results of this study were as follows; 1) There are much difference of hardwoods shrinkage, generally values of heavy wood's shrinkage were larger than that of light wood's shrinkage. 2) The arithmetic; mean values of hardwoods shrinkage were respectively 9.03% on tangential, 4.09% on radial and 0.37% on longitudinal direction and its ratio of at : ar : al was appeared to be 10 : 5.5 : 0.4 3) Average shrinkage per 1% of moisture content was different due to the direction and species. 4) According to the increase of specific gravity the values of shrinkage increased. 5) It was recognized that the shrinkage of hardwoods had a tendency to decrease as increase of annual ring width of wood. 6) The shrinkage of tangential direction was in propertion to the shrinkage of radial direction.

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Analysis of Genetic Relationship by RAPD Technique for Codonopsis lanceolata Trauty Collected from the Baekdoo Mountain and Korea (백두산지역과 국내 더덕 수집종의 RAPD에 의한 유연관계 분석)

  • Doo, Hong-Soo;Ryu, Jeom-Ho;Lee, Kang-Soo;Li, Hu Lin;Liu, Xian Hu
    • Korean Journal of Medicinal Crop Science
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    • v.10 no.3
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    • pp.194-199
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    • 2002
  • Extracted genomic DNA from 16 accessions of Codonopsis lanceolata collected from South Korea and the Baekdoo Mt. areas of China were analyzed for their genetic relationships by RAPD. Twenty 10-mer-oligonucleotide primers having reproductive polymorphism were selected for the RAPD analysis. The size of amplified DNA was almost between 125 bp and 2.0 kbp. Sixteen collected Codonopsis lanceolata were analyzed with 20 primers which generated 73(49.3%) polymorphic bands among 148 PCR products. The mean number of polymorphic bands were 7.4 and varied $1{\sim}9$ per primer. It was, thus, demonstrated that RAPD was useful for detecting polymorphism in Codonopsis lanceolata. The range of 1-F value(genetic similarity) was from 0.682 to 0.959. These results indicate variable genetic similarities. By UPGMA (Unweighted Pair Group Method using an Arithmetic average) cluster analysis based on 1-F value, genetic distance among the 16 collected Codonopsis lanceolata was $0.133{\sim}0.400$. It was certainly classified into two groups between collected accessions from Korea and China, and the genetic distance was about 0.281. Both accessions collected from Korea and China showed miner differences, while the genetic relationships of Tonghua Xian and Liuhe Xian from China was farthest with other accessions collected.