• Title/Summary/Keyword: Trapezoid

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Stability Analysis of Dunnage for Transportation of a Steel Roll Coil using Powder of Waste Tire and Cord-rubber Scrap (폐타이어 고무분말과 코드-고무 스크랩을 이용한 철재 롤코일 선박운송용 Dunnage 안정성 해석)

  • Kwac, Lee-Ku;Kim, Hang-Woo;Ha, Jae-Ho;Kim, Jae-Yeol;Kim, Hong-Gun
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.6
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    • pp.22-31
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    • 2006
  • When ironwork, especially steel roll coil, is transported to customers, land transportation and sea transportation are usually used. To transport steel roll coil fast and safe without damaging it, it is necessary that the steel roll coil has to be in stable condition. These days, apitong, which is all imported from overseas, is being used to support the steel roll coil, but because of apitong's rigidity, it damages the coil and when the coil is damaged, it is hard to fix. Due to the fact that recovering damage of the coil is almost impossible, we have to find the new type of dunnage that can substitute the apitong. In this paper, the arrays and the kinds of reinforcements, and rectangular type and trapezoid of dunnage will be talked about. The phenomenon of rolling and the impact when the carrier start moving and stop will be talked about as well. Therefore, we are going to develop a dunnage that does not damage ironwork and has better recovery and softness than existing apitong dunnage.

Treatment of Acromioclavicular Joint Injury (견봉 쇄골인대 손상의 치료)

  • Noh, Kyu-Cheol;Lee, Jae-Won;Yoo, Yon-Sik
    • Journal of the Korean Arthroscopy Society
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    • v.15 no.1
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    • pp.58-68
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    • 2011
  • Acromioclavicular (AC) joint dislocations are common injuries in active individuals secondary to direct force on the lateral aspect of the adducted shoulder. Complete disruption of the acromioclavicular and coracoclavicular (CC) ligaments may occur, depending on the magnitude of the insulting force. Most of these injuries are successfully treated without surgery. However, for the treatment of cases in which surgical management is warranted, there are more than 100 surgical techniques available without a gold standard technique. We review the anatomy of the acromioclavicular joint, the diagnosis of disorders of this joint, and the different treatment options in this article.

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ROENTGENOGRAPHIC STUDY ON THE GROWTH AND DEVELOPMENT OF TOOTH GERM AND DENTAL ARCH IN HUMAN FETUS (태아(胎兒)의 치배(齒胚) 및 치열궁(齒列弓)의 성장(成長)과 발육(發育)에 관(關)한 방사선적(放射線的) 연구(?究))

  • Chean, Ok Kyung;Suhr, Cheong Hoon
    • The korean journal of orthodontics
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    • v.12 no.2
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    • pp.95-108
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    • 1982
  • The purpose of this study was to analyze the growth and development of tooth germ and dental arch related to the bone growth during the fetal period. From 70 maxillae and 61 mandibles of the fetus aged 5, 6, 7, 8, 9 and 10 months, X-ray films were taken and measured. The results were as follows; 1. There was remarkable bone growth in the anterior and posterior area of palatum osseum, that were the intetior portion of both deciduous canines anteriorly and the intero-posterior portion of both deciduous second molars posteriorly, where there was active bone growth and radiate formation of bony trabeculae was found. 2. The Growth of anterior tooth germ was greater than that of posterior tooth germ, so anterior tooth germs were crowded. Especially in maxilla, the tooth germs of deciduous lateral incisors were located inside of dental arch and the tooth germs of deciduous canines were located outside of dental arch. 3. Crowding amount increased with the fetal age because the growth of tooth germs was greater than that of jaw bone. 4. In the growth of upper dental arch, the increase of width was greater than that of length. 5. There was proportional relationship between the area of Palatal Trapezoid and the fetal age.

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Fuzzy Regression Model Using Trapezoidal Fuzzy Numbers for Re-auction Data

  • Kim, Il Kyu;Lee, Woo-Joo;Yoon, Jin Hee;Choi, Seung Hoe
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • v.16 no.1
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    • pp.72-80
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    • 2016
  • Re-auction happens when a bid winner defaults on the payment without making second in-line purchase declaration even after determining sales permission. This is a process of selling under the court's authority. Re-auctioning contract price of real estate is largely influenced by the real estate business, real estate value, and the number of bidders. This paper is designed to establish a statistical model that deals with the number of bidders participating especially in apartment re-auctioning. For these, diverse factors are taken into consideration, including ratio of minimum sales value from the point of selling to re-auctioning, number of bidders at the time of selling, investment value of the real estate, and so forth. As an attempt to consider ambiguous and vague factors, this paper presents a comparatively vague concept of real estate and bidders as trapezoid fuzzy number. Two different methods based on the least squares estimation are applied to fuzzy regression model in this paper. The first method is the estimating method applying substitution after obtaining the estimators of regression coefficients, and the other method is to estimate directly from the estimating procedure without substitution. These methods are provided in application for re-auction data, and appropriate performance measure is also provided to compare the accuracies.

A Study on the Performance Analysis in the Plate and Shell Heat Exchanger (판각형 열교환기 성능해석에 관한 연구)

  • Seo, M.K.;Park, J.H.;Kim, Y.S.
    • Journal of Power System Engineering
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    • v.5 no.1
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    • pp.35-43
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    • 2001
  • Heat exchangers are called with important devices which have been widely used in industrial fields. Therefore, the design method for a heat exchanger is an important study in the aspect of energy saving. In this study, performance analyses for two types of plate and shell heat exchangers having a corrugated trapezoid shape of a chevron angle with $45^{\circ}$, were executed and compared with experiments. For this study, the operation liquids were adopted with non-phase changing water. In the analysis, ${\epsilon}-NTU$ method was used for a plate and shell heat exchanger and a program was constructed. Independent variables for a plate and shell heat exchanger are flow rate and inlet temperature. Compared with experimental data, the accuracy of the developed are ${\pm}2.5%\;and\;{\pm}5%$ at the type A and type B in the heat transfer rate, respectively. In the pressure drop, the accuracy of the proposed program for a plate and shell heat exchanger is within ${\pm}3%$ and 5% error bounds for the type A and type B, respectively.

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A Type Analysis of Students' Responses for Assessing Creativity in Activity Using Manipulative (교구를 활용한 활동에서 창의성 평가를 위한 학생들의 반응 유형 분석)

  • Lee, Kang-Sup;Shim, Sang-Kil
    • The Mathematical Education
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    • v.46 no.2 s.117
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    • pp.227-237
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    • 2007
  • This research analyzes students' response types in the creativity assessment by using pattern block, geoboard, and pantomino. 74 students from third grade to sixth grade participated in this research. 15 minutes were given to pattern block and geoboard questions. 74 students showed 393 answers in pattern block question and 590 answers in geoboard question. In pantomino, 20 minutes were given and 54 students showed 443 types of answers. The results are as follows: First, in the students' responses, tendency of using particular piece or figure, which presents conjoining in a piece selection and positioning, showed strongly. For example, usage of hexagon and trapezoid pieces were higer in pattern block and usage of L, P, and I pieces were higer in pentomino. Second, it is confirmed that creativity's subordinate factors, fluency, flexibility, and originality, are separate from each other. To illustrate, in pattern block, three students', who showed 11 types of responses in fluency, flexibility responses were each 5, 6, and 8 types. Specially, among those studenys, only one could achieve a point in originality. Third, students' response types categorized in this research could be used for a bae-data to mark grades on originality.

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Analysis of Drying Stream Characteristics in the Rural Area (농촌하천 건천화 특성조사 및 분석 -경기 진위천 중심-)

  • Park, Ki-Wook;Yoon, Yeo-Jung;Ju, Uk-Jong
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2005.10a
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    • pp.68-73
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    • 2005
  • The purpose of this study are to insure flow rate for rural stream in the rural area. The analysis of drying stream characteristics for two streams(Bong-mu, Wang-jang stream) from field survey data. Also, a study area has been determined, and criteria of estimation has been established : criteria such as, available hydrological data, the size of stream lengths and basin areas and regional characteristics. The spacial analysis is applied to stream slopes for upstream and downstream at weirs, stream networks and ground water pump stations, sinuosity of drying stream. As a result of drying streams survey analysis, drying stream characteristics are followed; levee types are earth and natural, cross sectional shapes are trapezoid, stream bed materials are gravels and sands, facilities in streams are weirs. The cause of the reduction analyzed by investigation of the current status of facilities for agricultural water use. Agricultural reservoirs block up the stream and water does not flow over the reservoirs except by storm. They also discharge water through diversion channels and the water diverted does not flow through the natural stream. Farmers directly take water from the stream by weirs.

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A Study on the Historical Research of Indigo Clothing Gifts of Early Joseon -Focusing on the Po and Ieom of King Seongjong's Reign- (조선 전기 아청사여복식(鴉靑賜與服飾)의 고증적 분석 -성종 재위기의 포 류와 이엄을 중심으로-)

  • Choi, Jeong
    • Journal of the Korean Society of Clothing and Textiles
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    • v.44 no.1
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    • pp.107-125
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    • 2020
  • Indigo [鴉靑] was used as a symbolic color in 15th century diplomacy. This study reinforces the historical research for characteristic and shapes of indigo colored royal clothing gift in King Seongjong's reign with a focus on po [袍] and ieom [耳掩]. Clothing made of fur that was combined with satin damask, silk gossamer [綃] were frequent gift, and a sable coat was a symbol of high-ranking clothes. Another clothing's materials were satin damask, sheer fabric gauze [羅], cotton, tabby with silk and ramie [紵絲]. The indigo color of King Seongjong's reign was recommended not for luxury. Historical research factors for indigo clothing gift were extracted from noblemen's relics. Danryeong and jigryeong are shaped of narrow sleeves and trapezoid gusset pleated in and out. Sable coat can consist of satin damask outshell, sable lining, and double oblique collar. Heohyung are presumed types of short sleeved fur vests. Ieom can be reconstructed with an indigo fabric outshell and sufficient fur. Dapho has gusset pleated wide and narrow. As additional gifts, the shapes of yoseon-cheopri and cheopri were analyzed. We selected a commercial fabric similar to relics and an indigo powder dyeing method to remedy a lack of traditional material. The reconstructed data were presented as flat drawings and samples.

Fabrication of Large Area Silicon Mirror for Integrated Optical Pickup (집적형 광 픽업용 대면적 실리콘 미러 제작)

  • Kim, Hae-Sung;Lee, Myung-Bok;Sohn, Jin-Seung;Suh, Sung-Dong;Cho, Eun-Hyoung
    • Transactions of the Society of Information Storage Systems
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    • v.1 no.2
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    • pp.182-187
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    • 2005
  • A large area micro mirror is an optical element that functions as changing an optical path by reflection in integrated optical system. We fabricated the large area silicon mirror by anisotropic etching using MEMS for implementation of integrated optical pickup. In this work, we report the optimum conditions to better fabricate and design, greatly improve mirror surface quality. To obtain mirror surface of $45^{\circ},\;9.74^{\circ}$ off-axis silicon wafer from (100) plane was used in etching condition of $80^{\circ}C$ with 40wt.% KOH solution. After wet etching, polishing process by MR fluid was applied to mirror surface for reduction of roughness. In the next step, after polymer coating on the polished Si wafer, the Si mirror was fabricated by UV curing using a trapezoid bar-type way structure. Finally, we obtained peak to valley roughness about 50 nm in large area of $mm^2$ and it is applicable to optical pickup using blu-ray wavelength as well as infrared wavelength.

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Double Talk Detection using the Fuzzy Inference (퍼지 추론을 이용한 동시통화 검출)

  • 류근택;배현덕
    • Journal of Broadcast Engineering
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    • v.5 no.1
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    • pp.123-129
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    • 2000
  • This paper addresses a new double detection algorithm which is based on the fuzzy control in the adaptive echo canceller of communication system. In this method, the two input of the fuzzy inference for detecting double talk condition are used. The one is the cross-correlation coefficient between the error signal and the primary signal which is the summed signal of the real echo signal and the near-end signal. The other is the cross-correlation coefficient between the estimation error signal and the primary signal. The fuzzy controller made a fuzzification for two inputs by the membership functions of trapezoid and them became the composition using inference rules. The composed result is defuzzificated by the center gravity method. The output is compared with two threshold values to detect double talk and echo path variation effectively. It is confirmed by computer simulation that this fuzzy double talk detector is able to track echo path variation accurately.

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