• Title/Summary/Keyword: Box design

Search Result 1,450, Processing Time 0.027 seconds

Correlation between Box Size and Fatigue of the Back Muscles During Lifting Action (들어올리기 동작에서 상자크기와 척추근의 상관관계)

  • Koo H. R.;Lee S. S.;Mun J. H.
    • Journal of Biosystems Engineering
    • /
    • v.29 no.6 s.107
    • /
    • pp.531-538
    • /
    • 2004
  • This study examined the muscle fatigue of the erector spinae according to box size during lifting activity. Ten healthy adult man participated in the experiment for lifting the boxes 10 times with 0.2 lift/s frequency. Bilateral surface EMG (Electomyogtamphy) recordings were made regarding M. (Muscle) Longissimus, M. Iliocostal and M, Multifidus activity throughout lifting working. The median frequency in back muscle fatigue was investigated using power spectral analysis of surface EMG. When the box larger than shoulder width was lifted, the muscle fatigue of M, Multifidus was shown larger than one of the other muscles. Accordingly, the result far M. Multifidus can be applied in optimizing design parameter of box. Also, the standard of box width for box makers have to be below about 420 mm, being average shoulder width of adult male.

Design and Implementation of Vision Box Based on Embedded Platform (Embedded Platform 기반 Vision Box 설계 및 구현)

  • Kim, Pan-Kyu;Lee, Jong-Hyeok
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.11 no.1
    • /
    • pp.191-197
    • /
    • 2007
  • Vision system is an object recognition system analyzing image information captured through camera. Vision system can be applied to various fields, and vehicle recognition is ole of them. There have been many proposals about algorithm of vehicle recognition. But have complex calculation processing. So they need long processing time and sometimes they make problems. In this research we suggested vehicle type recognition system using vision bpx based on embedded platform. As a result of testing this system achieves 100% rate of recognition at the optimal condition. But when condition is changed by lighting, noise and angle, rate of recognition is decreased as pattern score is lowered and recognition speed is slowed.

A Robust DES-like cryptographic algorithm against Differential Cryptanalysis (Differential 공격에 강한 DES-like 암호 알고리즘)

  • 김구영;원치선
    • Journal of the Korea Institute of Information Security & Cryptology
    • /
    • v.7 no.3
    • /
    • pp.65-78
    • /
    • 1997
  • Due to the cryptographic functional structure including the S-box, DES is not robust against differential cryptoanalysis (DC). Therefore, to increase the security against DC, we have to redesign the S-box or modify DES algorithm to decrease the probability for the N-1 round characteristics. However, it has been shown that a new design for the S-box is not secure enough. Rather, if will be more reliable to devise a modified cryptographic algorithm. In this paper, we propose a modified DES algorithm to decrease the probability of N-1 round characteristics to be robust against DC. According to our comparative study, the proposed algorithm is shown to be more robust against the DC than DES.

A Study on Centrifugal Compressor Design Optimization for Increasing Surge Margin (서지 마진 증가를 고려한 원심 압축기 설계 최적화)

  • Chai, Jae-Ha
    • The KSFM Journal of Fluid Machinery
    • /
    • v.11 no.2
    • /
    • pp.38-45
    • /
    • 2008
  • This study presents a numerical procedure to optimize the compressor design to increase the surge margin of compressor with response surface method (RSM). The Box-Behnken design method is used to reduce the number of calculation for fitting the second-order response surface. In order to consider the increase of surge margin during numerical optimization without any calculation at the surge point, the slope of compressor characteristic curve at the design point is suggested as an objective function in the present optimization problem. Mean line performance analysis method is used to get the design and off-design characteristic curves of centrifugal compressor. The impeller exit angle, impeller exit height and impeller radius are chosen as design variables. The optimum shapes show the increase of surge margin for the surge margin optimization and increase of efficiency for the efficiency optimization in comparison with an initial shape.

A Study on Digital design process of the materialization of Free form Design Architecture (비정형 건축 구현을 위한 디지털 디자인 프로세스에 관한 연구)

  • Lee, Jae-Kook;Lee, Kang-Bok
    • Journal of The Korean Digital Architecture Interior Association
    • /
    • v.11 no.2
    • /
    • pp.13-19
    • /
    • 2011
  • Starting in modern times by Le Corbusier, architectures made by concretes are still developing in these times. For several decades, the shape of box architecture has been the most familiar type of buildings. Of course "The concrete is the type of box building" isn't always right, but what we have most seen was the buildings which has been stylized and made by concretes. Through modern times to these days based on international style and functionalism, the type of box building was the most effective and good profit type of architecture which has not disregarded the capitalism. Free-form building are becoming a common place, and many of these are designed and constructed using sophisticated techniques. The main technique being used is Generative Technology of Form for free-form construction. People's interest is growing in this, and it is becoming widely used both abroad and domestically. The purpose of this paper is to investigate the use of Generative Technology of Form which is a digitally adapted design methodology in architecture. The digital design process used for contemporary buildings share many typical features that exist within a standard digital template, but also an increasing amount of mass customization that has to be produced at an additional cost. This paper will summarize these features in terms of free-form architecture, and in terms of the digital design process. In fact, 3D models have to be conceded as main design products considering features of Free Form Design Architecture. However it is practical to design twice over, because all forms of architectural drawings are 2D. From now on, design of Free Form Design Building is not to separate between design process and practical process, but to compound them as unified design system applied the process to communicate information interactively. For this, it should be required to impose unified digital design process and perform researches about effective way to apply in the field of Free-form Design Architecture.

Design Thermal Loads In Composite Box Girder Bridges (합성형교량의 설계온도하중)

  • Chang, Sung Pil;Im, Chang Kyun
    • Journal of Korean Society of Steel Construction
    • /
    • v.10 no.3 s.36
    • /
    • pp.537-551
    • /
    • 1998
  • The intention of this paper is to provide realistic values of design thermal loads applicable to composite box girder bridges on the basis of the statistical analysis of long-term measured temperature data. For this purpose, temperatures were recorded at a newly constructed composite box girder bridge during about 20 months. Before analyzing the extreme values, major thermal loading parameters that characterize the temperature profile are defined, and a seasonal behavior of those is examined in detail. The limit distributions of the thermal loading parameters are then determined by the tail-equivalence method, and the thermal loading parameters corresponding to selected return period are calculated. Finally, the results are compared to the specifications suggested in a current design code for thermal loads, and it is concluded that the current design code is unsuitable for representing the self-equilibrated thermal stresses in composite bridges, and the horizontal temperature difference which is not suggested in current design code should be taken Into account in particular cases.

  • PDF

Evaluation of Effective Temperature for Estimate Design Thermal Loads in Steel Deck of Steel Box Girder Bridges (강상자형교의 강바닥판에서 설계온도하중을 위한 유효온도 산정)

  • Shin, Dong-Wook;Kim, Kyoung-Nam;Choi, Chul-Ho;Lee, Seong-Haeng
    • Journal of the Korea institute for structural maintenance and inspection
    • /
    • v.17 no.6
    • /
    • pp.77-87
    • /
    • 2013
  • A present LSD (limited state design) code for temperature load in the domestic bridge design has applied a uniform standard for various bridge types. In this study, in order to calculate the effective temperature, a specimen of steel box girder bridge section with real size dimension was manufactured. For a year, the temperature data were measured at the 18 point in steel deck of steel box girder bridges specimen. Effective temperature within the cross section according to atmospheric temperature was calculated by this experiment data. The analyzed results were very similar correlation when compared with the effective temperature of the Euro Code. Therefore, the effective temperature which calculated based on the present data could be used as the basic data in order to present to the appropriate design criteria for the thermal loads on the domestic bridge design.

Preparation of Cosmeceuticals Containing Flos Sophorae Immaturus Extracts: Optimization Using Box-Behnken Design Model (회화나무꽃 추출물이 함유된 Cosmeceuticals의 제조: Box-Behnken 설계모델을 이용한 최적화)

  • Yoo, Bong-Ho;Zuo, Chengliang;Lee, Seung Bum
    • Applied Chemistry for Engineering
    • /
    • v.31 no.4
    • /
    • pp.404-410
    • /
    • 2020
  • In this study, the stability criteria of cosmeceuticals emulsion containing Flos Sophorae Immaturus extracts was established using the Box-Behnken design model (BBD-RSM). As optimization conditions of the emulsification using the BBD-RSM, the amount of surfactant and additive, and emulsification time and speed were used as quantitative factors while mean droplet size (MDS), viscosity and emulsion stability index (ESI) were used as reaction values. According to the result of BBD-RSM, optimum conditions for the emulsification were as follows; the emulsification time and speed of 17.8 min and 5505 rpm, respectively and amounts of the emulsifier and additive of 2.28 and 1.05 wt.%, respectively. Under these conditions, the MDS, viscosity, and ESI after 7 days from the reaction were estimated as 1875.5 nm, 1789.7 cP, and 93.8%, respectively. The average error value from our actual experiments for verifying the conclusions was below 5%, which is mainly due to the fact that the BBD-RSM was applied to the optimized cosmeceuticals emulsification.

Packaging Design of EPS Cooling Box by Theoretical Heat Flow and Random Vibration Analysis (이론적 열유동 및 랜덤 진동 해석을 적용한 EPS 보냉용기의 포장설계)

  • Kim, Su-Hyun;Park Sang-Hoon;Lee, Min-A;Jung, Hyun-Mo
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
    • /
    • v.27 no.3
    • /
    • pp.175-180
    • /
    • 2021
  • Although it has recently been regulated for use as an eco-friendly policy in Korea, the use of EPS (Expanded Polystyrene) cooling boxes, which are used as cold chain delivery insulation boxes for fresh agricultural and livestock products, is also increasing rapidly as e-commerce logistics such as delivery have increased rapidly due to COVID-19. Studies were conducted to optimize the EPS cooling container through internal air heat flow of CFD (Computational Fluid Dynamics) analysis and FEM (Finite Element Method) random vibration analysis using domestic PSD (Power Spectral Density) profile of the EPS cooling box to which the refrigerant is applied in this study. In the analysis of the internal air heat flow by the refrigerant in the EPS cooling box, the application of vertical protrusions inside was excellent in volume heat flow and internal air temperature distribution. In addition, as a result of random vibration analysis, the internal vertical protrusion gives the rigid effect of the cooling box, so that displacement and stress generation due to vibration during transport are smaller than that of a general cooling container without protrusion. By utilizing the resonance point (frequency) of the EPS cooling box derived by the Model analysis of ANSYS Software, it can be applied to the insulation and cushion packaging design of the EPS product line, which is widely used as insulation and cushion materials.

Design of brain-state-in-a-Box neural networks using parametrization of solution space and genetic algorithm (해공간의 매개변수화와 알고리즘을 이용한 BSB 신경망의 설계)

  • 윤성식;박주영;박대희
    • Journal of the Korean Institute of Telematics and Electronics B
    • /
    • v.33B no.2
    • /
    • pp.178-186
    • /
    • 1996
  • This paper proposes a new design technique that can be used for BSB (brain-state-in-a-box) neural networks to realize autoassociative memories. The proposed method is based on the parametrization of solution space and optimization using genetic algorithm. The applicability of the established technique is demonstrated by means of a simulation example, which illustrates its strengths.

  • PDF