• Title/Summary/Keyword: Slender body

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The Interaction Effect Acting on a Ship Hull in the Proximity of Bank Wall (측벽근방을 항해하는 대형선박에 미치는 측벽의 영향)

  • Lee, Chun-Ki;Park, Hain-Il
    • Journal of Navigation and Port Research
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    • v.28 no.5
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    • pp.333-337
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    • 2004
  • It is well known that the hydrodynamic interaction forces between ship and bank wall affect ship manoeuvring motion This paper deals with the interaction effect acting on a ship navigating closely in the proximity of bank wall. In this paper, the calculation method based on the slender body theory for estimation of the hydrodynamic interaction forces between ship and bank wall is applied. The hydrodynamic interaction forces acting on a ship during passing through the proximity of the bank wall are predicted to evaluate an influence of these interaction forces on ship manoeuvrability. The calculation method used in this paper will be useful for prediction of ship manoeuvrability at the initial stage of design, for automatic control system of ship in confined waterways, for discussion of marine traffic control system and for construction of harbour.

A Study on the Hydrodynamic Force Acting on a Large Vessel in the Proximity of Breakwater (방파제 형상 연직구조물 부근을 항행하는 대형선박에 미치는 간섭력에 관한 연구)

  • Lee, Chun-Ki
    • Journal of Navigation and Port Research
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    • v.37 no.4
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    • pp.345-350
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    • 2013
  • It is well known that the hydrodynamic forces and moments induced by the proximity of bank in confined waters, such as in a harbour or narrow channel affect ship's maneuvering motion. In this paper, the calculation method based on the slender body theory for estimation of the hydrodynamic force between ship and breakwater is applied, and also, the characteristic features of hydrodynamic force acting on a large vessel in the proximity of a breakwater are described and illustrated. Furthermore, the effects of water depth and the lateral spacing between ship and breakwater are summarized and discussed.

Numerical study of hydrodynamic interaction on a vessel in restricted waterways

  • Lee, Chun-Ki
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.4 no.1
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    • pp.1-8
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    • 2012
  • The hydrodynamic interaction between ship and bank can't be neglected when a vessel is app- roached toward the tip of a wedge-shaped bank in restricted waterways, such as in a harbor, near some fixed obstacles, or in a narrow channel. In this paper, the characteristic features of the hydrodynamic interaction acting on a slowly moving vessel in the proximity of a wedge-shaped bank are described and illustrated, and the effects of water depth and the spacing between ship and wedge-shaped bank are summarized and discussed based on the slender body theory. From the theoretical results, it indicated that the hydrodynamic interactions decrease as wedge-shaped bank of angle ${\beta}$ in-creases. For water depth to draft ratio less than about 2.0, the hydrodynamic interactions between ship and bank in-crease sharply as h/d decreases, regardless of the wedge-shaped bank of angle ${\beta}$. Also, for lateral separation more than about 0.2L between ship and wedge-shaped bank, it can be concluded that the bank effects decrease largely as the separation increases.

Modiolicola avadeevi, a New Sabelliphilid Copepod (Poecilostomatoida) from a Bivalve in the Sea of Japan (동해의 털담치(이매패류)에 공생하는 요각류 1신종, Modiolicola avdeevi)

  • Kim, Il-Hoi
    • Animal Systematics, Evolution and Diversity
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    • v.11 no.3
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    • pp.315-321
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    • 1995
  • A new species of Copepoda, Modiolicola avdeevi (Poecilostomatoida, Sabelliphilidae) associated with the bivalve Modiolus difficilis Kuroda and Habe in the Sea of Japan, is described . Although resembling close to Modiolicola bifidus Tanaka, 1961 in the body form, the new species is distinguished from M.bifidus by the more slender antenna, stouter caudal rami and more slender leg 5.

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Newly recorded sea star Henricia hayashii(Asteroidea: Spinulosida: Echinasteridae) in the East Sea, Korea

  • Ubagan, Michael Dadole;Shin, Sook
    • Korean Journal of Environmental Biology
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    • v.39 no.3
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    • pp.289-292
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    • 2021
  • Henricia specimen was collected from the East Sea of Korea using fishing nets. The specimen was identified as Henricia hayashii (Djakonov 1961), belonging to the family Echinasteridae of the order Spinulosida. This species can be distinguished from other Henricia species by slender arms (R/r=7.4), constricted arm base, six to thirty-five slender spinelets, open-meshed, reticulated abactinal skeleton comprising semi-triangular, rod-like form, and small ossicles present inside the papular areas. This species superficially resembles H. reniossa in terms of its body size but differs in the shape and arrangement of the abactinal and actinal plates. To date, two genera of Echinasteridae, Aleutihenricia and Henricia, including a total of 14 species, have been reported in Korea. Herein, the morphological characteristics of H. hayashii are described, and photographs are provided.

Body Type Classification and Characteristic Analysis of the Lower Body of 14-16 Years Old Female Adolescents (14~16세 여자 청소년 하반신 체형 유형화 및 특징 분석)

  • Park, Seiyoung;Kim, Dong-Eun
    • Journal of the Korean Society of Clothing and Textiles
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    • v.46 no.4
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    • pp.672-686
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    • 2022
  • The study classifies and analyzes the lower-body-shape types of female adolescents aged 14 to 16 years to provide meaningful information for making ready-to-wear patterns that are suitable for various female adolescent body types. The body-size data of 830 females aged 14 to 16 years were analyzed from 6th Size Korea anthropometric study. A factor analysis of 27 measurement items related to the lower body extracted 3 factors: waist/upper legs, height of the lower body, and hip area. A cluster analysis classified the female adolescent lower-body types into four clusters: the skinny body type with the shortest lower-body length, the most obese body type with the largest girth, the normal body type with the longest hip length, and the slender body type with the longest lower-body length. The discriminant analysis determined that nine measurement items had the most influence on classifying lower-body-shape types, and discriminant functions were derived. These results are meaningful because they provide more precise information about lower-body-shape types.

A Study on the Visual Effects According to Changes in Width of Pleats and Skirt Length of Accordion Pleats Skirt (아코디언 플리츠 스커트의 주름너비와 스커트길이 변화에 따른 시각적 효과)

  • Lee, Jung-Soon
    • Journal of the Korea Fashion and Costume Design Association
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    • v.12 no.1
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    • pp.77-88
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    • 2010
  • The purpose of this study is to evaluate the differences of visual effects by variations in the width of pleats and the length of the accordion pleats skirt. The stimuli are 21 samples: 7 variations of the width of pleats and 3 variations of the length of skirt. The data has been obtained from 43 fashion design majors. The data has been analyzed by Factor Analysis, Anova, Scheffe's Test and the MCA method. The results of the study are as follows: The visual effects by the number of pleats and the length of skirt are composed of 2 factors: verticality and thickness of lower body, shape of abdomen. In these factors, verticality and thickness of lower body factor is estimated by the most important factor. The accordion pleats skirt makes the lower body look longer when the width of the pleats is wider, and helps the calf and leg look thinner. Also, the waist looks more slender and thin. As the skirt gets longer, one looks taller, and legs look longer and thinner. The shape of abdomen is no difference according to the width of pleats. As the skirt gets longer, the waist looks more slender and thinner. The interaction of visual effect according to the changes in width of pleats and skirt length of accordion pleats skirt is not shown, and the skirt length has more effect than the width of pleats does in verticality and width of lower body factor. The width of pleats has more effect than the skirt length does in shape of abdomen factor.

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Description of Morphology and Osteology of the Slender Ribbonfish, Trachipterus ishikawae Jordan & Snyder, 1901 (투라치, Trachipterus ishikawae Jordan & Snyder, 1901의 형태 및 골격)

  • Han, Kyeong-Ho;Lee, Seong-Hoon;Kim, Chun-Cheol;Yu, Tae-Sik
    • Korean Journal of Ichthyology
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    • v.32 no.3
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    • pp.136-142
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    • 2020
  • Morphology and osteology of the slender ribbonfish, Trachipterus ishikawae was described and figured in detail. The morphological characteristics are as follow: body elongate and compressed; upper jaw protrusile; tubercles along ventral edge of body and tail; eyes are large; body naked; caudal fin long and at a right angle to the body; from (3~4)+(7~8) gill rakers; from 180 to 185 dorsal fin rays, from 12 to 13 pectoral fin rays; 9 caudal fin rays and 5+2 short spine at caudal spine. The osteological characteristics are as follow: premaxillary is long and has four teeth; dentary is triangle shape; interopercle and subopercle are wide and flat; 5 branchiostegal rays; post clavicle is thin and long; from 79 to 80 centrum; posterior vertebrae elongate; 5~6 tubercles at urostyle bone.

A Study of Body Form Classification on Eldlerly Women Using Body Indices (지수치를 이용한 노년여성 체형유형화에 관한 연구)

  • 이경희;최혜섭
    • Journal of the Korean Society of Clothing and Textiles
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    • v.18 no.4
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    • pp.560-565
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    • 1994
  • The purpose of this study was to extract information of body form's classification on elderly women. We measured 242 subjects from 55 to 75 years of age, using 27 direct measurement items and 25 body indices. We analyzed these indices with factor analysis, cluster analysis We obtained these following results 1) Through factor analysis, 4 factors (obesity of torso, location of upper torso items, length of upper torso, location of lower torso items & shoulder length) were extracted from body indices. 2) Through culster analysis, we categorized 4 clusters. Namely, type 1, characterized the best slender type, type 2; characterized obesity type, type 3: characterized middle sized type ; type 4: characterized by fat type less than type 2. We considered that type 3 is the typical type on elderly women. Since analysis using indices is very profitable, it may be necessary to design dummies and patterns for clothing manufacture.

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A Study on Body Satisfaction and Fitness Apparel Based on Body Type by Body Mass Index: In Women 20-50's Years of Age (BMI지수에 의한 신체유형별 신체만족도와 의복적합성에 관한 연구: 20~50대 여성을 중심으로)

  • Kweon, Soo-Ae;Sohn, Boo-Hyun
    • Journal of the Korean Home Economics Association
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    • v.48 no.6
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    • pp.1-8
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    • 2010
  • The purpose of this study is to classify body type by BMI and to inquire about body satisfaction and fitness apparel depending on body type among women 20-50years of age. As a result, body types are classified into three groups: lean, normal, and obese figures. On front silhouette, the normal type occupies most in women belonged to lean figure group, the obese lower part of the bodytype in normal figure group, and the obese upper part of the body type in obese figure group. On the other, in side silhouette, the slender type is prevalent in lean figure group, hip obesity in normal figure group, and trunk obesity in obese figure group. In particular, women in the obese figure group were distributed among the various body types. The obese figure group had a lower fitness apparel in the measurement of circumference(e.g., chest, waist, and hip) related to obesity in comparison with measurement of length. Therefore, the development of an optimal sizing system in response to the various body types in the obese figure group is needed to provide more diversity in aesthetic design and continuity among various sizing systems.