• Title, Summary, Keyword: similarity plot

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The Similarity Plot for Comparing Clustering Methods (군집분석 방법들을 비교하기 위한 상사그림)

  • Jang, Dae-Heung
    • The Korean Journal of Applied Statistics
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    • v.26 no.2
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    • pp.361-373
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    • 2013
  • There are a wide variety of clustering algorithms; subsequently, we need a measure of similarity between two clustering methods. Such a measure can compare how well different clustering algorithms perform on a set of data. More numbers of compared clustering algorithms allow for more number of valuers for a measure of similarity between two clustering methods. Thus, we need a simple tool that presents the many values of a measure of similarity to compare many clustering methods. We suggest some graphical tools to compareg many clustering methods.

Evaluation of Vegetation Recovery after Restortaion Works at the Nogodan Area, Jirisan National Park (지리산국립공원 노고단 일원 식생복원지 회복 평가)

  • Oh, Koo-Kyoon
    • Korean Journal of Environment and Ecology
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    • v.31 no.1
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    • pp.93-103
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    • 2017
  • The purpose of this study is to assess the recovery rate of vegetation structure after restoration works at the damaged Nogodan area in Jirisan National Park. Fourteen monitoring plots were set up at restoring work area and twelve control plots were set up at natural forest near monitoring plots. Flora, Relative Importance Percentage and Similarity Index were analyzed. Mean Similarity Index between monitering plot and control plot near helliport area showed thirty five point two percent and height of shrub layer recovered up to twenty percent, approxomately durindg twenty three years after experimental restoration works. Mean Similarity Index between monitering plot and control plot around Nogodan peak area showed seventeen point six percent but height of shrub layer recovered up to twenty percent, approxomately during ninteen years after restoration works. Mean similarity index between monitering plot and control plot on transfered millitary area showed thirty four point three percent but coverage of shrub layer showed twenty percent,approxomately during seven years after restoration works. Long term monitering shall be necessary for developing assessment criteria of ecologial restoration and ecological restoration technology.

Plot Size for Investigating Forest Community Structure(II) -Adequate Plot Area of Tree Stratum in a Mixed Forest Community at T$\v{o}$kyusan Area- (삼림군집구조 조사를 위한 조사구 크기에 관한 연구(II) -덕유산지역 혼효림군집 교목층의 적정 조사구 면적-)

  • Park, In-Hyeop;Ryu, Chang-Hee;Cho, Woo
    • Korean Journal of Environment and Ecology
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    • v.7 no.2
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    • pp.187-191
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    • 1994
  • A mixed forest community in Tokyusan was studied to determine the adequate plot area of tree stratum for investigating forest community structure. Nineteen nested plots were set up in the studied forest community, and species-area curve and performance curve were established. According to species-area curve, the minimum plot area where a given percentage increase in plot area produced less than the same percentage increase in number of species was 500$m^2$. The minimum plot area where a given percentage increase in plot area produced less than the half of the percentage increase in number of species was 1,000$m^2$. According to performance curve of the importance values of the major species, the minimum plot area where the importance value of the major species was distinguished from each other was 900$m^2$, and the minimum plot area was 500$m^2$ except for a big tree of Pinus densiflora distributed unexpectedly. According to performance curve of species diversity, the minimum plot area was 400$m^2$. Similarity indices between plot area above 900$m^2$ and total plot area were more than 90% and similarity indices between plot area above 400$m^2$ and total plot area were more than 85%. It may be as a conclusion that minimum plot area was generally about 500$m^2$ and in case of requiring more accuracy, minimum plot area was about 1,000$m^2$.

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The Relationship Between Soil Seed Bank and Ground Layer of Actual Vegetation in Korea (현존식생 내 초본층과 매토종자와의 관계)

  • Shin, Hyun-Tak;Yi, Myung-Hoon
    • Journal of Environmental Science International
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    • v.20 no.1
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    • pp.127-135
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    • 2011
  • This study was carried out in each three study areas of Pinus densiflora community and Quercus mongolica community from March 5th, 2008 to October 15th, 2010 to analyze the relationship between seed bank and the actual vegetation of the lower layer. Based on the relationship between the lower layer of actual vegetation and the germination of seed bank, all of three study areas, the similarity of the actual vegetation of the lower layer and seed bank were high in Plot 1 (84.62%) and Plot 3 (89.91%). As for Quercus mongolica community, the similarity was high between the actual vegetation of the lower layer and seed bank in Plot 4 (82.24%) and Plot 6 (89.47%). Especially, the germination of the pine seed banks in the Pinus densiflora community compared to other tree species appeared in all. In Quercus mongolica community, Quercus mongolica did not appear among the seeds germinated in the seek bank, but the other tree species constituting the under layer of the community. In case of the restoration based on the actual vegetation, it is desirable to sue the lower layer of vegetation as the model for the making of its alternatives for restoration works of the species.

Plot Size for Investigating Forest Community Structure(III) -Adequate Plot Area of Shrub Stratum in a Pinus densiflora Forest at Chuwangsan Area- (삼림군집구조 조사를 위한 조사구 크기에 관한 연구(III) -주왕산지역 소나무림의 관목층 적정 조사구 면적-)

  • 박인협;문광선
    • Korean Journal of Environment and Ecology
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    • v.8 no.2
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    • pp.150-153
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    • 1995
  • A Pinus densiflora forest in Chuwangsan was studied to determine the adequate plot area of shrub stratum for investigating forest community structure. Nineteen nested plots were set up in the studied forest, and species-area curve and performance curve were established. According to species-area curve, the minimum plot area where a given percentage increase in plot area produced less than the same percentage increase in number of species was 900$m^2$. The minimum plot area where a given percentage increase in plot area produced less than the half of the percent-age increase in number of species was 1,500$m^2$. According to performance curve of the importance values of the major species, the minimum plot area where the importance value of the major species was distinguished from each other was 1,400$m^2$. According to performance curve of species diversity, the minimum plot area was 750-1,500$m^2$. Similarity indices between plot area above 900$m^2$ and total plot area were more than 90% and similarity indices between plot area above 625$m^2$ and total plot area were more than 85%. It may be given as a conclusion that minimum plot area was about 1,500$m^2$ in case of requiring more accuracy.

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Impurity Profiling Analysis of Illicit Methamphetamine Seized in Korea (우리나라에서 불법 유통되는 메스암페타민의 불순물 프로화일 분석)

  • Yoo, Young-Chan;Chung, Hee-Sun;Kim, Eun-Mi;Kim, Sun-Cheun;Kim, Seung-Whan
    • YAKHAK HOEJI
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    • v.42 no.6
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    • pp.627-633
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    • 1998
  • Impurity profiling analysis of methamphetamine seized in Korea was investigated for the evidential and intelligent purpose. Samples were extracted with ethylacetate which contai ns internal standard of dioctylsebacate under basic condition and extracts were analyzed by GC-FID. Ephedrine, chloroephedrine & 1,2-dimethyl-3-phenylaziridine were identified impurities in illicit methamphetamine by GC-MS. These impurities revealed that most of abused methamphetamine in Korea were synthesized from ephedrine as a starting material. For the classification of samples. firstly, 24 impurity peaks were selected after inspection of every peak in 50 samples as the specific markers of impurities. Secondly, corresponding peak retention time and area ratio to the internal standard were calculated and database was created with values of 24 peaks by in-house program. Finally, cluster analysis was attempted with the resultant profiles using the STAR plot, which was based on the Euclidian distance for evaluating similarity among samples. A total of 76 samples were divided into 8 different groups within 90% statistical similarity and inter-batch samples showed similar impurity patterns by this procedure. In conclusion, the analysis of impurities is a suitable index for estimation the common or different origin of methamphetamine sample.

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Assessment on Ecological Characteristics of Vegetation in the Trail of Area Adjacent to GeumJeong Mountain Fortress (금정산성 등산로 주변 식생의 생태적 특성 평가)

  • Nam, Jung-Chil;Seo, Jung-Bum;Jo, Kuk-Hee;Kim, Seok-Kyu
    • Journal of Environmental Impact Assessment
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    • v.19 no.6
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    • pp.527-537
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    • 2010
  • This study are Geumjung mountain fortress of the Busan Metropolitan City in the north gate of the East gate around the trail to identify the vegetation structure importance value, dominance, species diversity, similarity index analysis. Results of the study, plot on the western slopes elevation 423-636m, slopes of $15{\sim}20^{\circ}$ slope areas, Pinus densiflora, Pinus thunbergii, Quercus acutissima, Pinus thunbergii, Pinus rigida, Carpinus coreana, Quercus mongolica are fulfilling a community. Trees layer a height 8~12m, coverage 40~70%, sub-trees layer the height 3~7m, coverage 10~80%, shrubs layer the height 0.8~1.5m, coverage 20-30%, herb layer the height 0.1~0.5m, coverage 5-10% were in the range of plot in the east slope elevation 452-647m, slopes in the slope of $5-30^{\circ}$ and Pinus rigida, Pinus thunbergii, Pinus densiflora, Quercus mongolica, Quercus dentata, Carpinus coreana is fulfilling a community. The trees layer height 8~13m, coverage 0~70%, sub-trees layer the height 2~6m, coverage 0~80%, shrubs layer the height 0.8~1.5m, coverage 20-40%, herb layer the height 0.1-0.5m, coverage 5-40% were in the range. The survey showed to be in relatively good vegetation, but in some areas of Pinus rigida, Quercus acutissima, as was predicted in succession, the shrub layer in the plot of some dominated vine plants and vegetation management will be needed for this purpose respectively.

Implementation and Performance Evaluation of Self-Similar Traffic Generator Using OPNET (OPNET을 이용한 자기유사성 트래픽 발생기 설계 및 성능 평가)

  • Han Kyeong-Eun;Jung Kwang-Bon;Lee Seung-Hyun;Kim Young-Chon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.5A
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    • pp.441-450
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    • 2006
  • Recently, with the exponential growth of the number of Internet users, IP traffic which occupies more than 90 percent of the entire Internet traffic affects significantly to the performance of networks. Therefore, the design of the self-similar traffic generator reflected the feature of IP traffic is very important to design the networks efficiently and evaluate the performance of it correctly. In this paper, we design the self-similar traffic generator using OPNET. In order to implement the self-similar characteristics, ON-OFF sources with Pateto distribution are employed and aggregated. The designed self-similarity traffic generator is evaluated and verified with R/S plot, variance time(VT) plot under the various offered loads and the number of sources. It is expected that the designed self-similar traffic generator can be put to practical use when wire or wireless networks is designed and verified as well as it can be useful to decide the specific parameter value for Internet traffic modeling.

Clustering and Comparative Analyses of Complete Genomes for the Elucidation of Evolutionary Characteristics

  • Kim, Jin-Sik;Lee, Sang-Yup
    • Proceedings of the Korean Society for Bioinformatics Conference
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    • pp.78-82
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    • 2005
  • Three of the genus Pseudomonas (P. aeruginosa, P. putida, P. syringae) show highly different phenotypic characteristics among them. Two of the three members are pathogenic and the other is non-pathogenic. Comparative analyses of the complete genomes can elucidate the genomic similarities and differences among them. We analyzed the three genomes and the genes of them to reveal the degree of conservation of chromosomes and similarity of the genes. The 2-dimensional dot plot between the pathogenic P. aeruginosa and non-pathogenic P. putida shared higher portion of the nucleotide sequences than other two combinations. Comparison of the nucleotide compositions by calculating the genome-scale plot of G+C contents and GC skew showed the variation of location. Comparison of the metabolic capabilities using the functional classification of KEGG orthology revealed that the differences in the number of genes for the specific functional categories resulted in the phenotypic differences. Finally combination of the analyses using the protein homologs supported the evolutionary distance of the P. putida obtained from other genome-scale comparisons.

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A study on estimating background concentration of groundwater for water quality assessment in non-water supply district (상수도 미보급 지역의 지하수 수질상태 평가를 위한 배경농도 산정방법에 관한 연구)

  • Yea, Young-Do;Seo, Yong-Gyo;Kim, Rak-Hyeon;Cho, Dong-Jun;Kim, Kwang-Shik;Cho, Wook-Sang
    • Journal of Korean Society of Water and Wastewater
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    • v.28 no.3
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    • pp.345-358
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    • 2014
  • For introducing the groundwater quality assessment using background concentration of groundwater, several methods had been studied to estimate the background concentration of groundwater and to suggest the background concentration of study area. Some methods such as Box whisker plot, Percentile and Cumulative probability distribution had been adopted to estimate background concentration, and it was evaluated that the Cumulative probability distribution method presents more reasonable background concentration because it can consider the data distribution. So we estimated the background concentration of study area using cumulative probability distribution method. We suggested the background concentration for each hydrogeology respectively in case hydrogeological water quality similarity is very low.