• 한국농촌건축학회논문집
• /
• 제7권3호
• /
• pp.9-18
• /
• 2005

The environment in which we live is changing at an accelerated rate according to the needs of times, concrete structures are increasing daily responding to this advanced lifestyle as a result of demolition and construction. The production of noise and vibration during demolition work on these concrete structures has a major negative influence on the present environment in which we live. As a result, controls on this form of pollution are being strengthened. The aim of this study is to analyze and investigate zero - emission for decrease of environmental pllution in architecture construction field.

• International Journal of Automotive Technology
• /
• 제4권3호
• /
• pp.141-147
• /
• 2003

For improving high-safety, convenience, and ride comfort, the automotive design suffers from radical increase of the weight, the recycling-related rules, regulations on the waste gas, and environmental protection of the resources. Among them, it is well known that the weight increase is the most critical. Thus, in order to minimize the weight of the body-in-white that takes up 20-30% of the whole weight of the automobile, most automotive manufacturers have attempted to develop the aluminum intensive body-in-white using aluminum space frames. In this research, the crush test and simulation for aluminum extrusions are performed to evaluate the collapse characteristics of that light weighted material. Also. the same test and simulation was done for aluminum extrusions filled with structural foam. Then, these results are analyzed and compared. From these studies, the effectiveness of structural foam is evaluated in improving automotive crashworthiness. Finally, the design strategy and guideline of the structural form are suggested in order to improve the crashworthiness for aluminum space frame in the vehicle.

• 한국정보통신설비학회:학술대회논문집
• /
• 한국정보통신설비학회 2008년도 정보통신설비 학술대회
• /
• pp.159-162
• /
• 2008

Generally, sensor nodes can be easily compromised and seized by an adversary because sensor nodes are hostile environments after dissemination. An adversary may be various security attacks into the networks using compromised node. False data injection attack using compromised node, it may not only cause false alarms, but also the depletion of the severe amount of energy waste. Dynamic en-route scheme for Filtering False Data Injection (DEF) can detect and drop such forged report during the forwarding process. In this scheme, each forwarding nodes verify reports using a regular probability. In this paper, we propose verification probability adjustment scheme of forwarding nodes though a fuzzy rule-base system for the Dynamic en-route filtering scheme for Filtering False Data Injection in sensor networks. Verification probability determination of forwarding nodes use false traffic rate and distance form source to base station.

• Transactions on Electrical and Electronic Materials
• /
• 제12권6호
• /
• pp.227-233
• /
• 2011

The low efficiency of bulk thermoelectric materials has limited the widespread application of thermoelectric power generation. Theoretical and experimental investigations indicate that materials prepared in the form of nanowires show higher thermoelectric coefficients, thus promising to revolutionize the field. This article reviews the basics of thermoelectric power generation, conventional devices, the role of nanowires and the current status of the field.

• 융복합기술연구소 논문집
• /
• 제6권1호
• /
• pp.1-5
• /
• 2016

Additive manufacturing is converting a digitally designed object into a tangible three dimensional solid using an additive process where materials are applied in successive layers with no or very limited material waste. It can be distinguished form traditional manufacturing which begins with a fixed amount of raw material and removes excess to arrive at the final product. Generally there are five stages to the additive manufacturing supply chain, namely materials, systems, software, application design and production. In this paper, recent market trends and technology about additive manufacturing based on supply chain are analyzed and reviewed.

• Advances in concrete construction
• /
• 제3권3호
• /
• pp.187-202
• /
• 2015

The present study addresses about the development of sustainable concrete utilizing recycled coarse aggregates manufactured form waste concrete and colloidal Nano-Silica. Experimental investigations are carried out to determine compressive and tensile strength of concrete mixes designed with recycled coarse aggregates and different percentages of Nano-Silica. Moreover, water absorption, density and volume voids of concrete mixes are also examined to ascertain the influence of Nano-Silica on behavior of recycled aggregate concrete. The outcomes of the research depict that properties of concrete mixes are significantly affected with the introduction of recycled coarse aggregates in place of the natural coarse aggregates. However, the study reveals that the depletion of behavior of recycled aggregate concrete could be restored with the incorporation of little amount (3%) of Nano-Silica.

• Nuclear Engineering and Technology
• /
• 제52권5호
• /
• pp.1093-1097
• /
• 2020

A composite iodine sorbent was obtained in the form of porous polymer matrix with activated carbon particles impregnated with triethylenediamine deposited on its surface. A comparative assessment of the radioactive methyliodide capturing efficiency by the composite sorbent and a sample of industrial charcoal sorbent was conducted. It was shown that under the selected testing conditions, the hydraulic resistance of the composite sorbent is lower, and the sorption capacity is higher than that of the industrial charcoal sorbent. A method for comparing the effectiveness of iodine sorbents, based on the calculation of the ratio of the sorption capacity index to the minimum capacity index, needed for the required purification degree was proposed.

• Ocean and Polar Research
• /
• 제43권3호
• /
• pp.165-178
• /
• 2021

Gadolinium (Gd), one of a rare earth element (REE), has been widely used worldwide since the 1980s, as a resource material for contrast agents injected into examiners of magnetic resonance imaging (MRI) test. The organic complexed form of Gd shows an extremely stable behavior in natural environment (water), so is known that the artificial Gd from medical uses is not removed from the waste water treatment plant (WWTP) and eventually introduced into the ocean through the estuary. Since the 1990s, some previous studies have often been conducted on Gd anomalies in natural water and their effects an artificial origin from land or metropolitan areas, but little research has been potential impacts on the ocean water. In this paper, we review and introduce recent studies related to Gd anomaly in natural water and related marine effects, and also propose the future research directions.

• International Journal of Internet, Broadcasting and Communication
• /
• 제15권3호
• /
• pp.118-121
• /
• 2023

Recently, green energy support policies have been announced around the world in accordance with environmental regulations, and asthe market grows rapidly, demand for batteries is also increasing. Therefore, various methodologies for battery diagnosis and recycling methods are being discussed, but current accurate life prediction of batteries has limitations due to the nonlinear form according to the internal structure or chemical change of the battery. In this paper, CS2 lithium-ion battery measurement data measured at the A. James Clark School of Engineering, University of Marylan was used to predict battery performance with high accuracy using a convolutional neural network (CNN) model among deep learning-based models. As a result, the battery performance was predicted with high accuracy. A data structure with a matrix of total data 3,931 ☓ 19 was designed as test data for the CS2 battery and checking the result values, the MAE was 0.8451, the RMSE was 1.3448, and the accuracy was 0.984, confirming excellent performance.

• 방사성폐기물학회지
• /
• 제14권2호
• /
• pp.101-112
• /
• 2016

본 연구는 고방사성해수폐액 (HSW)으로부터 Barium (Ba)이 함침된 4A 제올라이트 (BaA)에 의한 고방사성핵종 중에 하나인 Sr의 흡착 제거를 수행하였다. BaA에 의한 Sr의 흡착 (BaA-Sr)은 Ba의 함침농도 20.2wt% 이상에서 Ba의 함침농도가 증가할수록 감소하며 Ba 함침농도는 20.2wt% 정도가 적당하였다. 그리고 BaA-Sr 흡착은 BaA 내 4A에 의한 Sr 흡착 (4A-Sr)에 $BaSO_4$ 침전에 따른 Sr 공침이 첨가되어, Sr의 농도가 0.2 mg/L 이하 (HSW 내 실제 Sr 농도 수준)에서 BaA는 m/V (흡착제량/용액 부피)=5 g/L, 4A는 m/V >20 g/L에서 99% 이상의 Sr 제거가 가능하였다. 이는 흡착제 단위 g 당 Sr의 처리용량 및 2차 고체폐기물 (폐흡착제 등) 발생량 저감화 차원에서 BaA-Sr 흡착이 4A-Sr 흡착보다 우수함을 나타낸다. 또한 BaA-Sr 흡착이 증류수보다 해수폐액에서 Sr의 제거능이 우수하여 HSW로부터 직접 Sr을 제거하는 데 효과적일 것으로 보인다. 반면에 BaA에 의한 Cs의 흡착 (BaA-Cs)은 주로 BaA 내 4A에 의해서 이루어지고 있어 함침 Ba의 영향은 거의 없는 것 같다. 한편 BaA-Sr 흡착속도는 유사 2차 속도식으로 표현할 수 있으며, Sr의 초기농도 및 V/m 비 증가에 따라서 속도상수 ($k_2$)는 감소하지만 평형흡착량 ($q_e$)은 증가하고 있다. 그러나 용액의 온도증가에 따라서는 반대로 $k_2$는 증가하지만 $q_e$는 감소하고 있다. BaA-Sr 흡착 활성화에너지는 약 38 kJ/mol 로 강력한 결합 형태를 이룬 화학흡착은 아니더라도 물리적 흡착보다 화학적 흡착이 지배적일 것으로 보인다.