• Title, Summary, Keyword: sizing

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Analysis of the Hot Air Drying System of a Sizing Machine (가호기 열풍 건조 시스템의 해석)

  • 김수연;이상원;조경철;신경효
    • Textile Science and Engineering
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    • v.39 no.2
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    • pp.201-208
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    • 2002
  • The characteristics of hot air drying in the drying chamber of a sizing machine was numerically analyzed with respect to operating and ambient conditions. The results showed that the proposed model described Qualitatively the behavior of drying process of sized yarns in the drying chamber of a sizing machine well. The drying rate and moisture content of sized yarn were strongly dependent on the air temperature, humidity, and mass flow rate. From parametric studies, the optimal operating conditions were searched and obtained under given input and ambient conditions.

The Optimal Sizing and Efficient Driving Scheme of Series HEV (직렬형 HEV의 최적 용량산정과 효율적 운전방안)

  • 허민호
    • Proceedings of the KIPE Conference
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    • pp.651-656
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    • 2000
  • This paper describes the optimal sizing of each component using computer simulation and presents the efficient operating scheme of series HEV using hardware simulator the equivalent system. As the sizing method of components have been experimental and empirical it is needed to spend much time and development cost. however the results of computer simulation will set the optimal sizing of components in short time. There are two type of driving control power-tracking mode and load-levelling mode in series HEV. This paper presents that series HEV be operated in the load-levelling mode which is more efficient that power-tracking mode.

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Development of a Sizing System of Women's Fitness Wear for the Senior Population in South Korea (한국 노인 여성을 위한 피트니스 압박웨어 치수 개발)

  • Jeon, Eun-Jin;Lee, Won-sup;Park, Jang-Woon;You, Hee-Cheon
    • Fashion & Textile Research Journal
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    • v.20 no.4
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    • pp.464-473
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    • 2018
  • The objective of this study is to develop a sizing system of fitness clothing that can properly accommodate various body sizes of Korean senior women. The sizing system of upper and lower fitness clothing was developed in the present study by selection of key variables, identification of size category candidates, and determination of an optimal sizing system. First, key anthropometric dimensions (stature and bust circumference for upper clothing and stature; waist circumference for lower clothing) were identified by factor analysis on the direct body measurements (n = 272) and 3D whole-body scan data (n = 271) of Korean senior women in Size Korea. Second, sizing system candidates based on the key dimensions of upper and lower clothing were explored using a grid method and an optimization method. Lastly, among the sizing system candidates, optimal sizing systems of upper and lower clothing were selected in terms of accommodation rate. Five size categories (short/small, short/medium, tall/small, tall/medium, and tall/large) were selected as the optimal sizing systems of upper and lower clothing with 89% and 78% of accommodation rate, respectively, for the Korean senior women. The anthropometric characteristics of the representative humans of the optimal size categories would be of use in the design of fitness compressive wear for the better fit and effectiveness of exercise and health of Korean senior women.

Sizing System Development of Korean Structural Firefighting Protective Clothing (한국 소방용 방화복의 치수체계 개발)

  • Han, Sul-Ah;Nam, Yun-Ja;Choi, Young-Lim
    • Journal of the Korean Society of Clothing and Textiles
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    • v.33 no.5
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    • pp.827-839
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    • 2009
  • Sizing system of Korean structural firefighting protective clothing that is national approved should be met for specification of structural firefighting protective clothing that is identified by Ministry of Public Administration and Security(MOPAS). However if you look over the specification of sizing system, the standard is based on only 'height' and the others are indicated as the size of completed product. KS K ISO 13688 and EN 340 which is met on ISO 13688 which indicates sizing system about protective clothing has the standards of height, chest and waist circumference. Also NFPA 1971 that has standards of sizing system is based on chest circumference, cervical to wrist length, waist circumference and inseam. That is different from Korean standards. Therefore, fire fighting protective clothing standards which is based on only height should be compensated and not be relied on foreign standards like ISO. It is indispensable for developing our own sizing system of structural fire fighting protective clothing. In this studying, Korean new sizing system of structural fire fighting protective clothing was developed for providing basic information of ergonomic structural fire fighting protective clothing. The analyzed target age was between 20 and 59 years old fire fighter who extinguish the fire. And it was analyzed by 3D measurement among data of the $5^{th}$ Size Korea. On conclusion, in case of structural fire fighting protective clothing coat, physical dimension was to be chest circumference, cervical to wrist length. Three dimensions as 5cm space of circumference and four dimensions as 2.5cm space of cervical to wrist length were derived, which means that totally 12 dimensions were defined. Dimension standards of pants was based on the analysis of waist circumference and crotch height. Six dimensions as 5cm space of waist circumference and three dimensions as 5cm space of crotch height were derived, which means that totally 14 dimensions were defined.

A Study of Sizing System for Children′s Wear for the Use of E-Business (인터넷 전자 상거래를 위한 아동복 Sizing system 개발에 관한 연구)

  • 조진숙;최경희
    • Journal of the Korean Society of Clothing and Textiles
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    • v.26 no.6
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    • pp.923-934
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    • 2002
  • The aim of this study is to suggest a Sizing System which has following points:- 1. In order to satisfy children of diverse figure shapes, we developed sizing system for three different figure type. Figure types are categorized into slim, normal, fat type based on the Rohrer Index. 2. For each figure types, we developed size chart using height bust circumference and hip circumference as basic measurements. The size codes are presented as the height-bust circumference or height-hip circumference. The size interval of height is 5cm for all figure types, such as 120,125,130 ‥‥ we developed a size allocation program, which is helpful when a customer doesn't know exact measurement of some body dimension. If a customer input measurements as much as he/she hows, the program allocates the nearest. At the end of the study, the sizing interaction sites were developed to present the results of the study clear.

The Effect of Second Order Refraction on Optical Bubble Sizing in Multiphase Flows

  • Qiu, Huihe;Hsu, Chin-Tsau;Liu, Wei
    • Journal of Mechanical Science and Technology
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    • v.15 no.12
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    • pp.1801-1807
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    • 2001
  • In multiphase flne the bubble size and velocity. To achieve this, one of approaches is to utilize laser phase-Doppler anemometry. However, it was found that the second order refraction has great impact on PDA sizing method when the relative refractive index of media is less than one. In this paper, the problem of second order refraction is investigated and a model of phase-size correlation to eliminate the measurement errors is introduced for bubble sizing. As a result, the model relates the assumption of single scattering mechanism in conventional phase-Doppler anemometry. The results of simulations based on this new model by using Generalized Lorenz Mie Theory (GLMT) are compared with those based on the conventional method. An optimization method for accurately sizing air-bubble in water has been suggested.

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Influence of Base Paper Properties on Coating Penetration

  • Kim, Bong-Yong;Bousfield, Douglas W.
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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    • pp.148-153
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    • 2003
  • The influence of sizing, fiber and pigment type on coating penetration, using commercial paper and two types of handsheets as the base paper which were prepared from thermomechanical pulp(TMP) and hardwood bleached kraft pulp(KP) sized internally with alkyl ketone dimmer(AKD), was studied in terms of characteristics of coating holdout. Laboratory rod draw down coater was used for surface sizing and coating application. Characterization of coating penetration was done by measuring the roughness of the backside of coating layer. The backside of the coating was exposed by dissolving the fibers in a solution of cupriethylenedimine(CED). Data show that internal sizing of base paper is effective and surface sizing is more effective to prevent coating penetration. Comparing between the two types of base papers, backside roughness of coating layer of TMP sheet is much larger and sizing is more effective to reduce coating penetration than those of KP sheet. With regard to pigment type, clay is more effective than calcium carbonate for better coating holdout.

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FEM Analysis of Closed-Die Forging of a Bevel Gear (베벨기어 페쇄단조의 유한요소해석)

  • Park, Jong-Jin;Lee, Jung-Hwan;Lee, Young-Sun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.20 no.8
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    • pp.2458-2467
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    • 1996
  • The rigid-plastic finite element analysis was performed for analysis of ofhot forging and cold sizing of a bevel gear. Two dimensional analysis was carried out to investigate the defect occurrence on vertical symmetric planes during hot forging and three dimensional analysis was to understand the filling behavior on horizontal planes during cold sizing. The involute curve of a tooth was approximated by a circle for convenience in the present analysis. In order to estimate the elastic deformation of the gear and dies during cold sizing, linear elastic finite element analysis was performed. Results of the analysis can be used to predict grain flows and strength distributions in the forged gear, and to design dies and an appropriate preform for the cold sizing.

Effect of Poly(acrylic acid-co-vinyl acetate) in Warp Sizing of Cotton Voile Fabric (면 Voile지의 경사가호에 있어서 Poly(acrylic acid-co-vinyl acetate)의 첨가효과)

  • Yu, Dong-Gwon;Yu, Byeong-Seung;Kim, Hae-Gon
    • Textile Science and Engineering
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    • v.32 no.8
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    • pp.775-781
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    • 1995
  • Emulsion copolymerization of acrylic acid and vinyl acetate has been carried out and the product has been applied to the warp sizing of hard twisted fine colon yarn for voile fabric. It has been revealed that the sizing effect is remarkably increased when the hydrophobic copolymer is added to the sizing formulation, consisting of polyester resin, modified starch and Poly aryliny alcohol owing to the reduction of yarn entanglement in the saw box. And the entanglement is dependent on the dean of yarn swelling in size solution. These led up to a conclusion that the improvement of sizing efficiency is related with the hydrophobicity of the copolymer.

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A Lot Sizing Model for Multi-Stage MRP Systems (다단계 생산시스템에서의 로트크기 결정방법)

  • Lee, Ho-Il;Kim, Man-Sik
    • Journal of the Korean Society for Quality Management
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    • v.18 no.1
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    • pp.65-76
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    • 1990
  • A lot-sizing model for multi-stage MRP systems is proposed, in which known demands must be satisfied. In this model, an approach with considerations of initial inventory and limited production capacity is involved. Most of the studies on the lot-sizing techniques for multi-stage material requirement planning systems have been focused upon two basic approaches. One approach is to develope an algorithm yielding an optimal solution. Due to the computational complexity and sensitivity of the optimal solution to the problem of lot sizing, heuristic approaches are often employed. In this paper, the heuristic approach is used by sequential application of a single-stage algorithm with a set of modified cost by the concept of multi-echelon costs. The proposed method is compared with an lot-sizing method(Florian-Klein Model) to prove its effectiveness by numerical examples.

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