• Title/Summary/Keyword: Effective Data Length

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Detonation cell size model based on deep neural network for hydrogen, methane and propane mixtures with air and oxygen

  • Malik, Konrad;Zbikowski, Mateusz;Teodorczyk, Andrzej
    • Nuclear Engineering and Technology
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    • v.51 no.2
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    • pp.424-431
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    • 2019
  • The aim of the present study was to develop model for detonation cell sizes prediction based on a deep artificial neural network of hydrogen, methane and propane mixtures with air and oxygen. The discussion about the currently available algorithms compared existing solutions and resulted in a conclusion that there is a need for a new model, free from uncertainty of the effective activation energy and the reaction length definitions. The model offers a better and more feasible alternative to the existing ones. Resulting predictions were validated against experimental data obtained during the investigation of detonation parameters, as well as with data collected from the literature. Additionally, separate models for individual mixtures were created and compared with the main model. The comparison showed no drawbacks caused by fitting one model to many mixtures. Moreover, it was demonstrated that the model may be easily extended by including more independent variables. As an example, dependency on pressure was examined. The preparation of experimental data for deep neural network training was described in detail to allow reproducing the results obtained and extending the model to different mixtures and initial conditions. The source code of ready to use models is also provided.

Analysis of 3D Facial Shapes of Female Adult to Improve Face Mask Fit

  • Choi, Jin;Do, Wol Hee
    • The Korean Fashion and Textile Research Journal
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    • v.22 no.6
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    • pp.826-833
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    • 2020
  • When it is necessary to wear masks for long periods, such as during the current COVID-19 pandemic, the essential function of masks to prevent contamination (or transmission to others) as well as comfortableness are important. For this study, we used three-dimensional (3D) facial measurements of adult women to compile basic face shape data for designing comfortable and effective masks. This study analyzed the 3D facial data of 127 subjects in their 20s to 30s of the 6th Size Korea. Factor analysis of the survey data produced seven factors that formed the composition of adult female faces. These factors combined to produce three facial types: square (long face and a large lower middle face), oval (smallest central and lower body in the middle), and triangle (short face with a small central and lower large nose). These types reflect that the facial types of adult women show the differences in the nose angle, nose length, bitragion-subnasal arc, bitragion-menton arc. Therefore, properly fitting masks for fine dust particle filtration require 3D customization of a mask's breathing apparatus to fit differently shaped central and lower face parts that interfere with mask fit.

A Geographic Routing based Data Delivery Scheme for Void Problem Handling in Wireless Sensor Networks (무선 센서 네트워크에서 보이드 문제 해결을 위한 위치 기반 데이터 전송 기법)

  • Kim, Seog-Gyu
    • Journal of the Korea Society of Computer and Information
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    • v.14 no.4
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    • pp.59-67
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    • 2009
  • In wireless sensor networks (WSNs), geographic greedy forwarding fails to move a packet further towards its destination if the sender does not have any closer node to the destination in its one hop transmission region. In this paper, we propose a enhanced geographic routing, called CGR(Cost based Geographic Routing) for efficient data delivery against void problem environment. CGR first establishes Shadow Bound Region and then accomplishes Renewing Cost Function Algorithm for effective greedy forwarding data delivery. Our simulation results show significant improvements compared with existing schemes in terms of routing path length, success delivery ratio and energy efficiency.

Evaluation of Thermal Movements of a Cable-Stayed Bridge Using Temperatures and Displacements Data (온도와 변위 데이터를 이용한 사장교의 온도신축거동 평가)

  • Park, Jong Chil
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.35 no.4
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    • pp.779-789
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    • 2015
  • Because cable-supported bridges have long spans and large members, their movements and geometrical changes by temperatures tend to be bigger than those of small or medium-sized bridges. Therefore, it is important for maintenance engineers to monitor and assess the effect of temperature on the cable-supported bridges. To evaluate how much the superstructure expands or contracts when subjected to changes in temperature is the first step for the maintenance. Thermal movements of a cable-stayed bridge in service are evaluated by using long-term temperatures and displacements data. Displacements data are obtained from extensometers and newly installed GNSS (Global Navigation Satellite System) receivers on the bridge. Based on the statistical data such as air temperatures, each sensor's temperatures, average temperatures and effective temperatures, correlation analysis between temperatures and displacements has been performed. Average temperatures or effective temperatures are most suitable for the evaluation of thermal movements. From linear regression analysis between effective temperatures and displacements, the variation rate's of displacement to temperature have been calculated. From additional regression analysis between expansion length's and variation rate's of displacement to temperature, the thermal expansion coefficient and neutral point have been estimated. Comparing these parameters with theoretical and analytical results, a practical procedure for evaluating the real thermal behaviors of the cable-supported bridges is proposed.

Fatigue Crack Growth Behavior of 7075-T6Al Alloy under Simple Stepped Variable Amplitude Loading Conditions (7075-T6Al 합금에 있어서 변동하중진폭 하에서의 피로균열성장거동)

  • 신용승
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.6 no.4
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    • pp.80-88
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    • 1997
  • An experimental investigation of the fatigue through crack growth behavior under simple stepped variable loading condition has been performed using Al7075-T651. Experiments were carried out by using cantilever bending type specimens, with chevron notches on a small electro-magnetic test machine. Tensile overloads have a retarding effect on the fatigue crack growth rates, therefore tensile overloads were used for the beneficial effect on the fatigue life. While in most cases compressive overloads have only a vanishing effect on crack growth rates, some experiments with single edge crack tension specimens reveal a marked growth retardation. The stress ratios used in this investigations varies from R=0.32 to 0.81, from R=0.04 to 0.76, from R=-0.15 to 0.73, and from R=-0.33 to 0.68 and the peak load for each case was not varied. The crack growth and crack closure were measured by Kikukawa's compliance method with a strain gauge mounted on the backside of each specimens. The results obtained are as follows. When the stepped variable load was applied, the smaller the stress ration was, the larger the delayed retardation of the crack growth rate was. The fatigue crack growh rate data obtained for through cracks were plotted well against the effective stress intensity factor range from 4.0 to 20.0MP{a^{SQRT}m}. It was found that the effective stress intensity factor range ratio was related well to the opening stress intensity factor, the maximum stress intensity factor, and crack length.

Study on Air-drying Characteristics of Taun Lumber and Air-dring Calendar(I) (타운 재목(材木)의 천연건조(天然乾燥) 특성(特性) 및 캘린더에 관한 연구(硏究)(I))

  • Jung, Hee-Suk
    • Journal of the Korean Wood Science and Technology
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    • v.13 no.3
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    • pp.27-33
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    • 1985
  • Air-drying tests were carried out on green taun (Pometia pinnata f glabra) for 25-mm and 50-mm thickness to elucidate drying characteristics on air-drying rate, time and defects in spring and air-drying calendar. The results of this study were as follows: 1. The air-dried lumber for 25-mm thickness from an initial average moisture content (MC) of $58.3{\pm}3.5$ percent reached 30 percent MC in 17 days, 25 percent MC in 24 days, 20 percent MC in 38 days and 15 percent MC in 84 days. 2. The air-dried lumber for 50-mm thickness from an initial average MC of $59.6{\pm}5.0$ percent reached 30 percent MC in 39 days, 25 percent MC in 55 days and 20 percent MC in 84 days. 3. Air-drying calendar that could be useful in estimating drying times for each month developed by the use of climatological data for Suwon. Total number of effective air-drying days during a year were 243.5 days and the major determinant of the effect air-drying days was temperature. 4. The air-drying rates for 25-mm and 50-mm coated lumber were slight1y slower than those of uncoated lumber. The number and total length of both end checks and surface checks for end coated lumber were less severe than those of uncoated lumber.

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A Method of Constructing Robust Descriptors Using Scale Space Derivatives (스케일 공간 도함수를 이용한 강인한 기술자 생성 기법)

  • Park, Jongseung;Park, Unsang
    • Journal of KIISE
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    • v.42 no.6
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    • pp.764-768
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    • 2015
  • Requirement of effective image handling methods such as image retrieval has been increasing with the rising production and consumption of multimedia data. In this paper, a method of constructing more effective descriptor is proposed for robust keypoint based image retrieval. The proposed method uses information embedded in the first order and second order derivative images, in addition to the scale space image, for the descriptor construction. The performance of multi-image descriptor is evaluated in terms of the similarities in keypoints with a public domain image database that contains various image transformations. The proposed descriptor shows significant improvement in keypoint matching with minor increase of the length.

Cost Effectiveness of Clozapine and Risperidone in "Revolving Door" Schizophrenia (재발과 입원을 반복하는 만성 정신분열병 환자에서 비전형적 항정신병약물의 비용-효과)

  • Nam, Jong-Won;Lee, Min-Soo;Jeong, In-Kwa;Kwak, Dong-Il
    • Korean Journal of Biological Psychiatry
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    • v.7 no.2
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    • pp.198-205
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    • 2000
  • Objectives : Risperidone and clozapine belong to a new generation of antipsychotics that are reportedly more effective and better tolerated than conventional neuroleptics. However, each of these agents costs far more per unit than conventional neuroleptics. The purpose of our retrospective study was to ascertain the total cost and effectiveness of treatment before and after administration of risperidone and clozapine in "revolving door" schizophrenia patients. Method : Data collected on revolving door schizophrenics for 2 years before clozapine and risperidone treatment and for at least 2 years after clozapine and risperidone treatment. Direct cost of inpatient and outpatient treatment was measured. Effectiveness was scaled as "years of mild disability gained". Result : Both risperidone and cloazpine result in higher costs and additional benefits to patients, for example, increased mild disability, reduced number of relapse, and reduced hospital length-of-stay. An ICER of risperidone was less than Rc and ICER of clozapine was greater than Rc. According to decision-analytic this model, risperidone had favorable cost-effectiveness ratios relative to clozapine. Conclusion : We have assumed that risperidone is more cost-effective than clozapine.

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Effects of Ultrasound on the Flexibility of the Waist after Stretching at the Erector Spinae in Normal Adults (척주세움근의 스트레칭 후 초음파 적용이 정상 성인의 허리 유연성에 미치는 영향)

  • Won-jye Choi
    • The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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    • v.29 no.3
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    • pp.55-61
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    • 2023
  • Background: The purpose of this study was to determine whether applying ultrasound after stretching the erector spinae muscle is an effective method for normal adults as a way to restore reduced back flexibility that causes back pain. Methods: The study was conducted on 60 healthy volunteers divided randomly into four groups (control group, stretching group, ultrasound group, ultrasound after stretching group). The flexibility-promoting effects were determined by assessing, each group, at the time of treatment, pre and post by modified fingertip to-floor (MFTF) and active straight leg raising (ASLR). The data were analyzed using the two-way ANOVA repeated measure with significant level α=.05. Results: Each group showed statistically significant changes in MFTF distance and ASLR degree. In the post-hoc test about this result, the length of MFTF and degree of ASLR in ultrasound after stretching group increased significantly compared to the others. Conclusion: The results suggest that using ultrasound after stretching is far more effective in increasing the flexibility of the erector spinae than using stretching or ultrasound intervention.

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A Study of the Foundation Garment Manufacturing for the Well-Balanced Somatotype - With middle-aged womenhood - (체형(體型) 균형화(均衡化)를 위한 파운데이션 가먼트 제작(製作)에 관한 연구(硏究) - 장년층(長年層) 여성(女性)을 중심으로 -)

  • Choi, Mee Sung;Kim, Ok Jin
    • Journal of the Korean Society of Clothing and Textiles
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    • v.17 no.2
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    • pp.247-264
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    • 1993
  • This study deals with the manufacturing of the foundation garments for the well-balanced somatotype of the Korean middle-aged womenhood. In order to get hold of the different somatotypes, a survey of a total of 134 middle-aged women in Kwangju area, ranging in their age from 45 through 59 was made. The statistical methods used for the analysis of the basic data were the Pearson's correlation coefficient, Anova, Cluster analysis and Stepwise. Emphasis of the try-on test was placed on (1) the comparison of anthropometric data before and after trying on the foundation garments, (2) sensory evaluation, (3) a rating on fit and performance, (4) the comparison by means of photograph. The conclusions obtained are as follows : 1) The 134 women sampled and measured were classified into the five groups of somatotype : the 52 women (34%) belong to Cluster 1 ; the 22 women(14.5%) belong in Cluster 2 ; the 12 women(7.9%) belong in Cluster 3 ; the 15 women(9.9%) belong in Cluster 4 ; the 33 women(27.7%) belong to Cluster 5. 2) As for the characteristics of the foundation garment design, the V-shaped neckline and chest dart was used. The adjust point is right above the perineum point. The foundation garment length is as far as trochanteric point. The materials used are cotton/polyurethane, lace, 100%cotton. The materials used for corrections were the sponge pad for the chest, and non-woven fabric pad for the back, shoulder and the hip. 3) The comparison of the anthropometric data of the subject when dressed in foundation garments showed a significant difference in bust point height, in bust point length and in nipple-ta-nipple breadth, which proves the foundation garments to be effective in correcting such part as the chest, the hip and the abdomen. 4) As considered in terms of the sensory evaluation, the item except for the shoulder and the armhole coincided with each other in the mean value and in the composite reliability coefficient, which also proves the foundation garments to be effective. 5) Subjects were satisfactory on fit, performance, design, of the foundation garment, and their changed appearance. 6) In the case of the comparison through the photographs, the silhouettes of all the five women subjects were found effectively to be balanced.

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