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Female Body Shape Classifications and Their Significant Impact on Fabric Utilization
T. Naveed,Y. Zhong,A. Hussain,A. A. Babar,A. Naeem,A. Iqbal,S. Saleemi 한국섬유공학회 2018 Fibers and polymers Vol.19 No.12
In apparel manufacturing, more than 50 % cost is consumed by the textile fabric. Therefore companies have significant apprehensions in the fabric utilization. It can result in more efficient and cost-effective in fabric utilization if they are related to different body shapes. The purpose of this study is to classify female body shapes and evaluate fabric utilization efficiency for each category of the body shape. To this end, three dimensional (3D) body scans are collected from 124 young female subjects. For the body shape analysis, 3D body scans are processed by using Moore neighbor algorithm and region prop function to perceive the outermost shell. Moreover, both front and side view of the scans is processed for data reduction using Principle Component Analysis (PCA) and clustering using K-Means ++. It has been observed through our analysis of a dataset that female bodies can be categorized into four body shapes, that is, oval shape, circle shape, triangle shape, and rectangle shape. It has also been observed that all four body shape categories exhibit dissimilar anthropometric size measures. The result implies that these body shapes have devoured different fabric utilization for the garments (fitted trouser and fitted shirt). It has been noted that in fitted trouser and fitted shirt the most effective is the rectangle shape (cluster 4) and the least is the circle shape (cluster 2) in the fabric consumption. Similarly, the fitted trousers utilize less fabric while the fitted shirts consume more fabric in all body shapes. These findings provide a better reference of fabric utilization and cost-effectiveness to the apparel manufacturers while producing garments for different categories of the body shape.
RETScreen(R) 지중열 히트펌프 모듈 한국 적용에 관한 연구
아메드 나비드(Naveed, Ahmed T),박상현(Park, Sanghyun),이의준(Lee, Euijoon),김병선(Kim, Byungseon) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Korea is utilizing geothermal resources mainly in the bathing and swimming facilities with very few applications for industrial processes or space heating. It is estimated that geothermal capacity and annual utilization are 36.2MWt and 761TJ/year as compared to global capacity and annual utilization of 15,145MWt and 190,699 TJ/year. RETScreen software is a user's friendly tool for analyzing the technical and financial pre-feasibility of potential Renewable Energy (RE) projects that promotes the use of RE applications through the capacity building of planners, decision-makers and industries for successful implementation of RE projects. Strong ties between Canada and Korean organizations such as Korean Solar Energy Society (KSES) and the Korea Institute of Energy Research (KIER) exist for knowledge transfer about RETScreen. In this paper, an overview of RETScreen and its ground source heat pump (GSHP) model with a practical example of an existing project of a community hall in Canada are described to illustrate effectiveness of RETScreenin the implementation of RE technologies. The same community hall project is then evaluated hypothetically considering its location at Kangnyng, Korea. The main objective is to demonstrate how RETScreen GSHP model can also be utilized effectively for GSHP applications in Korea.
아메드 나비드(Naveed, Ahmed T),강은철(Kang, E. C.),이의준(Lee, E. J.) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Photovoltaic (PV) module can generate electricity using sunlight without causing any environmental degradation. Due to higher fossil fuel prices and environmental awareness, PV applications are becoming more popular as clean source of electricity generation. PV output is sensitive to the operating temperature and can be drastically affected in Building Integrated PV (BIPV) systems. PV Solarwall (SWPV) combination and PV systems have been evaluated in this study for improvement in electrical output and system costs. PV modules under forced ventilation. A 75W polycrystalline silicon PV module was fixed on SW in front of the ventilation fan as it was indicated to be the coolest position on the SW in phoenix simulations. The effectiveness of cooling by means of the forced ventilating air stream has been studied experimentally. The results indicate that there appears to be significant difference in temperature as well as electricity output comparing the SWPV and BIPV options. Electrical output power recovered is about 4% during the typical day of the month of February. RETScreen(R) analysis of a 3kW PV system hypothetically located at Taegu has shown that with typical temperature reduction of 15^{{circ}C, it is possible to reduce the simple payback periods by one year. The work described in this paper may be viewed as an appraisal of a SWPV system based on its improved electrical and financial performances due to its ability to operate at relatively lower temperatures.
아메드 나비드(Ahmed T Naveed),강은철(Kang Eun-Chul),이의준(Lee Eui-Joon) 한국태양에너지학회 2005 한국태양에너지학회 논문집 Vol.25 No.4
PV 태양광 발전은 PV 재료가 고가이므로 일반 전력비용에 비해 상대적으로 비용이 높아진다. 저가형 광학 집광기술과 PV를 통합하게 되면, 비용뿐만 아니라 설치면적 등에서 유리하게 되나, 집광기의 단점이 함께 추가되게 된다. 집광기는 작은 수광각과 송신광선을 갖고 있어 PV 모듈에 필요한 태양광, 광학손실의 손실정도를 최소화하기 위한 신중한 시스템 디자인과 2축형 트레킹 장치가 필요하다. 고정식 비집광 시스템보다 더 많은 에너지를 얻기 위해서는 광학시스템의 손실율을 줄이고, 고효율의 PV 모듈을 이용한 PV 셀의 상호연결이 필요하다. 본 논문에서는 우선, 비이미지 프레넬 렌즈 집광기를 사용한 PV 시스템에 대하여 간단하게 설명한 후, 출력전력값을 이론적으로 예측하고 PV 효율과 시스템 성능을 제시하였다. 프레넬 렌즈 선형 집광기 통합 PV 시스템과 비집광 PV 모듈의 출력전력값과 시스템 비용을 비교하면, PV 전력비용을 줄일 수 있는 집광기의 이용이 유용한 것을 알 수 있다. 따라서, 집광형 PV 시스템은 미래의 에너지 이용에 매우 유리한 시스템이라 할 수 있다.
Panagiotis G. Asteris,Chrysanthos Maraveas,Athanasios T. Chountalas,Dimitrios S. Sophianopoulos,Naveed Alam 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.44 No.6
In this paper a mathematical model for the prediction of the fire resistance of slim-floor steel beams based on an Artificial Neural Network modeling procedure is presented. The artificial neural network models are trained and tested using an analytical database compiled for this purpose from analytical results based on FEM. The proposed model was selected as the optimum from a plethora of alternatives, employing different activation functions in the context of Artificial Neural Network technique. The performance of the developed model was compared against analytical results, employing several performance indices. It was found that the proposed model achieves remarkably improved predictions of the fire resistance of slim-floor steel beams. Moreover, based on the optimum developed AN model a closed-form equation for the estimation of fire resistance is derived, which can prove a useful tool for researchers and engineers, while at the same time can effectively support the teaching of this subject at an academic level.
강은철(Kang Eun-Chul),아메드 나비드(Ahmed T Naveed),김용환(Kim Yong-Hwan),조일식(Cho Yil-Sik),이의준(Lee Euy-Joon) 한국태양에너지학회 2006 한국태양에너지학회 학술대회논문집 Vol.- No.-
Relatively higher electricity generation costs of PV due to the use of expensive PV raw materials is one of the barrier to its wide spread utilization as a clean and environmental friendly electricity source. One option to overcome this cost barrier is the use of concentrating photovoltaic(CPV) system. A CPV system with a linear Fresnel film collector has been proposed to make a focal line over PV module which can be rotated manually along two axes to track the sun and the measurement system. The experiments to analyze outdoor current and voltage on the CPV module were made on January 23, 2006 in Daejeon. As results, the electrical power output of the CPV module was 4 times higher than the PV module during the measurement duration. The power at the maximum point at the PV module was 15.3W at the 25℃. The fill factor and efficiency were 0.7 and 19.46% respectively. While the measurement temperature was 55℃ under concentration of 3.2 sun. The fill factor of the CPV module due to concentration and higher operating temperature was deteriorated as evident from the shape of the I-V curve. The efficiency and fill factor were 12.8% and 0.5 respectively. The power, current and voltage at the maximum power point concentration were 32.2W, 3.8A and 8.6V.