• Title, Summary, Keyword: segments

Search Result 3,231, Processing Time 0.056 seconds

Hypothesis Tests For Performances of a New Spline Interpolation Technique (신 스플라인보간법의 퍼포먼스 가설점정)

  • Yu, Ki-Yun
    • Journal of Korean Society for Geospatial Information Science
    • /
    • v.7 no.1
    • /
    • pp.29-40
    • /
    • 1999
  • In vector GIS, natural linear entities (called linear entitles) are usually represented by a set of line segments. As an alternative of the line segments, curve segments can be used to represent the linear entities. The curve segments, as one-dimensional spatial objects, we generated by spline interpolation technique such as Bezier technique. In an effort to improve its accuracy in resembling the linear entities, the Bezier technique was modified generating a new technique (called New technique) (Kiyun, 1998). In this paper, validity of the New technique was tested. Test focused on answering two questions: (1) whether or not the curve segments from the New technique replace line segments so as to enhance the accuracy of representations of linear entities, and (2) whether or not the curve segments from the New technique represent the linear entities more accurately than curve segments from the Bezier technique. Answering these two questions entailed two hypothesis tests. For test data, a series of hydrologic lines on 7.5-minute USGS map series were selected. Test were done using t-test method and statistical inferences were made from the results. Test results indicated that curve segments from both the Bezier and New techniques represent the linear entities more accurately than the line segments do. In addition, curve segments from the New technique represent the linear entities more accurately than the line segments from the Bezier technique do at probability level 69% or higher.

  • PDF

Requirements analysis for production of freeform concrete segments. (비정형 콘크리트 부재 생산을 위한 요구조건 분석)

  • Sung, Soojin;Lee, Donghoon;Kim, Sunkuk
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • /
    • pp.68-69
    • /
    • 2014
  • Production of freeform concrete segments use various molds because of the unique shape of it unlike common concrete segments. As a result, the mold for freeform concrete segments cannot be reused. Therefor, cost overrun is occurred by needs of more time and manpower to produce the freeform concrete segments compared with common concrete segments. To prevent the cost overrun, a new production method for the freeform concrete segments is needed to develop and the requirements for it should be analyzed before. Therefor, the aim of this study is requirements analysis for production of freeform concrete segment. The requirements of production of freeform concrete segments and form for it is analyzed in this study. The result of this study would be used to suggest the new production method of freeform concrete segments.

  • PDF

Statistical Classification of Highway Segments for Improving the Efficiency of Short-term Traffic Count Planning (효율적인 교통량 조사를 계획하기 위한 조사구간의 통계적 특성 분류 연구)

  • Jung, YooSeok;Oh, JuSam
    • International Journal of Highway Engineering
    • /
    • v.18 no.3
    • /
    • pp.109-114
    • /
    • 2016
  • PURPOSES : The demand for extending national highways is increasing, but traffic monitoring is hindered because of resource limitations. Hence, this study classified highway segments into 5 types to improve the efficiency of short-term traffic count planning. METHODS : The traffic volume trends of 880 highway segments were classified through R-squared and linear regression analyses; the steadiness of traffic volume trends was evaluated through coefficient of variance (COV), and the normality of the data were determined through the Shapiro-Wilk W-test. RESULTS : Of the 880 segments, 574 segments had relatively low COV and were classified as type 1 segments, and 123 and 64 segments with increasing and decreasing traffic volume trends were classified as type 2 and type 3 segments, respectively; 80 segments that failed the normality test were classified as type 4, and the remaining 39 were classified as type 5 segments. CONCLUSIONS : A theoretical basis for biennial count planning was established. Biennial count is recommended for types 1~4 because their mean absolute percentage errors (MAPEs) are approximately 10%. For type 5 (MAPE =19.26%), the conventional annual count can be continued. The results of this analysis can reduce the traffic monitoring budget.

Developmental and Environmental Sources of Variation on Annual Growth Increments of Ascophyllum nodosum (Phaeophyceae)

  • Eckersley, Lindsay K.;Garbary, David J.
    • ALGAE
    • /
    • v.22 no.2
    • /
    • pp.107-116
    • /
    • 2007
  • Annual growth segments of Ascophyllum nodosum (L.) Le Jolis (Fucales, Fucaceae) are denoted by air bladders that form each spring. By examining annual growth segments, it may be possible to infer information about the physical conditions during the growth period; however, it is uncertain whether the annual segments will expand in size after the initial growth. We examined A. nodosum segments from three populations in Nova Scotia, and statistically evaluated whether the annual growth (length, mass, and maximum diameter) of segments was independent of the age of the frond, whether the segments increased in size after the initial growth, and whether the segment lengths were correlated with mean water temperatures and mean air temperatures when the segments were formed. We found that the growth in length of A. nodosum is dependent on the age of the frond, but frond age explained less than 12 % of the overall variation in length. However, the mass and maximum diameter of segments were independent of the age of the frond. Differences occurred between the lengths of segments formed in different years, but there was no significant correlation with regional mean water or air temperatures. This study indicates that the length of A. nodosum segments may be an indicator of the annual physical characteristics of a site, but future studies are needed to identify which factors have the strongest influence on growth patterns.

Multivariate Region Growing Method with Image Segments (영상분할단위 기반의 다변량 영역확장기법)

  • 이종열
    • Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
    • /
    • /
    • pp.273-278
    • /
    • 2004
  • Feature identification is one of the largest issue in high spatial resolution satellite imagery. A popular method associated with this feature identification is image segmentation to produce image segments that are more likely to features interested. Here, it is, proposed that combination of edge extraction and region growing methods for image segments were used to improve the result of image segmentation. At the intial step, an image was segmented by edge detection method. The segments were assigned IDs, and polygon topology of segments were built. Based on the topology, the segments were tested their similarities with adjacent segments using multivariate analysis. The segments that have similar spectral characteristics were merged into a region. The test application shows that the segments composed of individual large, spectrally homogeneous structures, such as buildings and roads, were merged into more similar shape of structures.

  • PDF

Studies on the Segmental Running of Splenic Tabecular Veins of Korean Cattle by the Vinylite Corrosion Technique (Vinyl 부식법(腐蝕法)에 의(依)한 한우비주정맥(韓牛脾柱靜脈)의 구역적(區域的) 주행(走行)에 관(關)한 연구(硏究))

  • Kim, Chong Sup
    • Korean Journal of Veterinary Research
    • /
    • v.11 no.1
    • /
    • pp.83-90
    • /
    • 1971
  • The studies were conducted to ramify the splenic trabecular veins by injection of vinylite into the splenic veins in twenty five adult Korean cattle. The following results were obtained. 1. Splenic trabecular veins of bovine were collected from 3 chief Rami lienales: Rr. superior, inferior and V. polaris superior of the splenic veins, and the splenic parenchyma was ramified to 5-11 intralienal venous segments by the course of the trabecular veins. 2. Each one of the intralienal venous segments was dealt with 2-4 minute segments therefore, the splenic parenchyma was ramified from 13 minute segments in minimum to 35 minute segments in maximum. 3. The distribution of the veins in the spleen was divided into 7 types by the number of intralienal venous segment, and also was 15 kinds by collecting veins, Rr. superior et inferior and V. polaris superior. 4. The anastomosis was observed in the intralienal venous segments or minute segments. 5. Generally the splenic veins and arteries were like each other, but when observed minutely, they were unlike.

  • PDF

Segmentation of Digital Curves by Structural Analysis (구조해석에 의한 디지털 곡선의 분리)

  • 류승필;권오석;김태균
    • Journal of the Korean Institute of Telematics and Electronics
    • /
    • v.26 no.12
    • /
    • pp.1984-1994
    • /
    • 1989
  • Techniques for approximating digitalcurves by polygonal lines are a valuable tool for image analysis and data compression. S. Shilien proposed a method for segmenting a digital curve into digital straight line segments digital straight line segments which are not satisfied with the structural properties, and have more than one break point by Shilien's method. Here, the structural representation of digital straight lines and digital staight line segments is described. And a method for segmenting a digital curve into digital straight line segments which are not satisfied with the structural properties, and have more than one break point by Shilien's method. Here, the structural representation of digital straight lines and digital staight line segments is described. And a method for segmenting a digital curve into digital straight line segments which may be not satisfied with the structural properties is proposed. The number of break points extracted by this method is less than that by S. Shilien's method from the digital curve which includes the digital straight line segments not satisfied with the structural properties.

  • PDF

A Study of English Loanwords

  • Lee, Hae-Bong
    • Proceedings of the KSPS conference
    • /
    • /
    • pp.365-365
    • /
    • 2000
  • English segments adopted into Korean can be divided into three types: Some English segments /$m, {\;}n, {\;}{\eta}, {\;}p^h, {\;}t^h, {\;}k^h$/ are adopted into the original sound [$m, {\;}n, {\;}{\eta}, {\;}p^h, {\;}t^h, {\;}k^h$] in Korean. Other segments /b, d, g/ appear in the voiceless stop form [p, t, k]. Generative Phonology explains the presence of the above English segments in Korean but it cannot explain why the English segments /$f, {\;}v, {\;}{\Theta}, {\;}{\breve{z}}, {\;}{\breve{c}}, {\;}{\breve{j}}$/ disappear during the adopting process. I present a set of universal constraints from the Optimality Theory proposed by Prince and Smolensky(l993) and I show how English segments differently adopted into Korean can be explained by these universal constraints such as Faith(feature). N oAffricateStop, Faith(nasal), NoNasalStop, Faith(voice), NoVoicedStop and the interaction of these constraints. I conclude that this Optimality Theory provides insights that better capture the nature of the phonological phenomena of English segments in Korean.

  • PDF

Development of Casting Technology for Freeform Concrete Segments (비정형 콘크리트 부재 생산을 위한 주조기술 개발)

  • Kim, Gyeongju;Lee, Donghoon;Kim, Sunkuk
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • /
    • pp.66-67
    • /
    • 2014
  • Design and construction of freeform building technologies are being implemented to reduce time and cost due to the development of materials and equipments. However, production of freeform concrete segments takes much more time and manpower than typical due to disposable mold and various shape. Therefore, manufacturing technology of freeform concrete segments need to be developed for securing economic and constructive feasibility. The objective of this study is development of efficient casting technology for freeform concrete segments in a short time. This technology includes details about the fluidity of concrete and the sectional shape of freeform concrete segments. And problem of cost and time can be solved. Also, mold can be reusable and freeform concrete segments will be produced quickly and accurately. After this study, productivity study for validation will continue through prototype development and example application.

  • PDF

The Coordination and Contribution of Body Segments during Functioning (기능에서 신체분절의 협응과 기여)

  • Chae, Jung-Byung
    • PNF and Movement
    • /
    • v.15 no.1
    • /
    • pp.13-25
    • /
    • 2017
  • Purpose: This study investigated the coordination and contribution of body segments during functioning. Methods: The relevant literature related to body segments and function were reviewed. Results: Efficient control of function is considered with regard to a participant's ability to perform a sequence of movements in body segments, which progresses from the head to the arm, trunk, pelvis, and leg segments. Each segment performs a specific role, which environment explorer using visual information for the head, reaching and grasping for the arms, a stabilizer for the trunk, and the distribution of COM in the pelvis and leg. Conclusion: During any of the movements, the momentum generated by the proximal segments is transferred to the adjacent distal segments in an appropriate sequence. In assessing function for clinical intervention strategies, the segment coordination, segment sequence, transfer of the center of body mass, asymmetrical ratio, muscle activity, and compensatory strategies should be considered.