13,307 research outputs found
Woosung Kim
No full text학위논문(석사)--아주대학교 산업대학원 :에너지학과,2014. 2화석에너지의 고갈로 세계는 에너지 절약 계획을 수립하고 저탄소 녹색성장을 일으키려는 노력을 해 왔다. 대기전력이라는 자동 소비성 전력을 발생시키는 전자기기에 대해서 국내는 대기전력저감프로그램을 통해 규제를 하고 있으며, 각 세계국가에서도 여러 가지 에너지 절감 정책을 통해 에너지 절약을 실천하고 있다.
우리 정부는 에너지 효율 및 대기전력 저감 제도를 시행해 왔으며 단계적이고 일관적인 정책으로 에너지 절감효과는 꾸준히 증대되고 있다.
신축 건물에 설치되는 콘센트 중 대기전력자동차단콘센트의 30% 의무적인 설치를 통해 소비자가 인지하지 못하고 있는 대기전력 부분을 차단하고 있으며, 이는 국가에 경제적으로 상당한 이익을 가져다주고 있다.
본 연구는 의무적으로 설치되는 대기전력자동차단콘센트의 에너지 절감효과를 통해 대기전력자동차단콘센트의 중요성을 나타내고 있다. 그리고 현재 판매되고 있는 콘센트의 대기전력의 비교분석을 통해 대기전력 차단의 기준 값 강화 및 소비자의 인식의 변화에 동기부여, 그리고 2015년까지 예상되는 에너지 절감 효과를 제시하고 있다. 또한 향후 기술융합을 통한 대기전력자동차단콘센트의 연구 방향에 대하여 제안하고 있다.논문요약 ⅲ
Abstract ⅳ
표 목차 ⅴ
그림 목차 ⅵ
Ⅰ. 서 론 1
1. 연구배경 1
2. 연구목적 및 범위 2
Ⅱ. 이론적인고찰 3
1.1. 대기전력의 개요 3
1.2. 대기전력자동차단콘센트의 개요 3
2. 대기전력자동차단콘센트의 국내 기술동향 5
2.1 대기전력자동차단콘센트 분류 6
3. 대기전력자동차단콘센트의 국내외 정책 11
3.1 대기전력자동차단콘센트의 국내정책 11
3.2 대기전력의 국외정책 16
Ⅲ. 대기전력자동차단콘센트의 측정 및 비교분석 20
1. 대기전력 측정 20
2. 대기전력의 비교분석 및 에너지 절감효과 27
2.1 대기전력자동차단콘센트의 보급률 27
2.2 에너지 절감 효과 전망 30
2.3 대기전력 차단 기준 33
Ⅳ. 결론 35
1. 결론 35
2. 연구의 한계 및 향후 연구 방향 36
참고문헌 38MasterDue to depletion of fossil energy, the world has established energy saving plan and made efforts to cause low carbon green growth. Electronic devices generating automatic consumption power of standby power have been regulated in Korea through standby power reduction program, and energy saving has been practiced through various kinds of energy saving policy in all countries of the world.
Our government has enforced energy efficiency and standby power reduction system, and energy reduction effect has increased continuously with phase-in and consistent policy.
Standby power has been blocked through 30% compulsory installation of auto standby power cutoff sockets among the sockets installed at new building, which gives considerable economic benefits to the country.
This study demonstrates the importance of auto standby power cutoff socket through energy reduction effects of auto standby power cutoff socket installed compulsorily. And through comparison and analysis of standby power of sockets currently available in the market, this study also presents expected energy reduction effects up to 2015 as well as motivation of change in awareness of consumers and reinforcement of reference value of standby power cutoff. In addition, this study also proposes the future study direction of auto standby power cutoff socket through future technology convergence
이산화황으로부터 내성을 지니는 코어-쉘 형 아민계 이산화탄소 흡착제 및 이의 제조 방법
No full textThe core-shell type amine-based carbon dioxide adsorbent including a chelating agent resistant to oxygen and sulfur dioxide according to the present invention is an adsorbent which includes a chelating agent to inhibit oxidative decomposition of amine and has, as a core, a porous support on which an amine compound is immobilized and has, as a shell, an amine layer resistant to inactivity by sulfur dioxide, and a method of preparing the same. The amine-based carbon dioxide adsorbent including a chelating agent exhibits considerably high oxidation resistance because an added chelate compound functions to directly remove a variety of transition metal impurities catalytically acting on amine oxidation. In addition, the sulfur dioxide-resistant amine layer of the shell selectively adsorbs sulfur dioxide to protect the amine compound of the core and, at the same time, the amine compound of the core selectively adsorbs only carbon dioxide. In addition, sulfur dioxide adsorbed on the shell is readily desorbed therefrom at about 110° C. and thus remarkably improved regeneration stability is obtained during the temperature-swing adsorption (TSA) process containing sulfur dioxide
A review in thermal management for advanced chip packaging from chip to heat sink
No full textAs the architectural complexity of semiconductor devices increases, energy-efficient thermal management in semiconductor packages has become a significant challenge. The effectiveness of thermal management dictates the performance and reliability of semiconductor packaging, making it a crucial factor in the design of highperformance and high-density systems. This review provides a detailed overview of recent advances in thermal management solutions for semiconductor packages, with a particular focus on heat conduction from the chip to the heat sink. The review first introduces advanced thermal characterization techniques, which are essential for evaluating the passive thermal performance of chip packages. It then explores the use of high thermal conductivity materials in various components, such as thermal interface materials (TIMs), heat spreaders, and package substrates, all of which are critical for improving heat dissipation. Additionally, the review examines design aspects aimed at enhancing heat removal rates, including interface engineering between dissimilar components and the incorporation of thermal vias within a package. The aforementioned approaches can be combined to optimize overall thermal performance in semiconductor packages, requiring careful material selection and appropriate thermal engineering design.
Network-based exploratory data analysis and explainable three-stage deep clustering for financial customer profiling
No full textEffective customer segmentation and communication of these findings to non-experts is a pressing task in the financial services sector, with the potential for widespread applications. This study employs a three-stage dimension reduction and clustering technique to segment a large, high-dimensional dataset, emphasizing explainability and intuitive visualization. We present the high-dimensional data and feature set using novel network-based visualization methods and identify the multi-stage process's optimal configuration. The approach segments 14,837 potential customers, each with 163 categorical and 143 numerical features. The first stage of the dimension reduction process employs deep neural network-based autoencoders. The second and third stage uses a non-neural network-based dimension reduction algorithm and clustering algorithm contingent on clus-tering performance. Subsequently, game theory-inspired Shapley values are computed for each feature to enhance explainability. The optimal approach involves an autoencoder, isometric mapping to three dimensions, and K-means clustering. Lastly, we derive investment portfolios for each segment to demonstrate an expert system application in financial investment advisory to underscore the importance of explainable segmentations.
Hydroprinting Technology to Transfer Ultrathin, Transparent, and Double-Sided Conductive Nanomembranes for Multiscale 3D Conformal Electronics
No full textTransparent multiscale 3D conformal electronics using hydroprinting with polyvinyl alcohol (PVA) as a sacrificial layer to transfer networks of silver nanowires (AgNWs) without a carrier layer is developed. However, AgNWs are known to disperse on water surfaces during the transfer process. Therefore, a functional film is developed by simultaneously welding and embedding AgNWs in the PVA through a simple one-step thermal pressing, demonstrating that ultrathin, transparent, and double-sided conductive/patterned nanomembranes with welded AgNWs can float on water without dispersion. The nanomembrane with an excellent figure of merit of 1200, a low sheet resistance of 16.2 Ω sq−1, and a high transmittance of 98.17% achieves conformal contact with excellent step surface coverage of complex macro- and microstructures because of its nanoscale thickness (54.39 nm) and numerous deformable micro- and nanopores. Furthermore, the double-sided conductive nanomembranes facilitate wiring and layer-by-layer assembly, regardless of the transfer direction of the surface. As a proof-of-concept demonstration, a nanomembrane-based aneurysm sensor is developed. Its high transparency enables coil embolization, and the sensor can measure the pushing force of the coil within an aneurysm in an endovascular simulator. Moreover, this newly developed hydroprinting technology provides a new method for the fabrication of transparent multiscale 3D conformal electronics.11Nsciescopu
Self-Assembled Femtoliter-Scale Structures in a Hollow Optical Fiber for Optofluidic Applications
No full textWe propose self-assembled femtoliter-fluid formation depending on temperature in a hollow optical fiber (HOF) by the unsophisticated flame brushing technology. Three kind of structures are generated, also we see the optical property
Author Correction: Evaluation of skin cancer resection guide using hyper‑realistic in‑vitro phantom fabricated by 3D printing
No full textThe original version of this Article contained an error in the spelling of the author Taehun Kim which was incorrectly given as Teahun Kim. The original Article has been corrected
Nitrogen-enriched porous organic polymers for high-performance CO2/N2 separation in mixed-matrix membranes
No full textThe development of high-performance mixed matrix membranes (MMMs) for CO2/N2 separation requires fillers that simultaneously enhance gas permeability and selectivity without introducing interfacial defects. In this study, we report the synthesis of nitrogen-containing porous organic polymers (POPs) via a one-step Friedel-Crafts polymerization, designed to introduce CO2-philic functional groups directly into the polymer backbone while preserving intrinsic porosity. Structural and gas sorption analyses confirmed that the synthesized POPs exhibit high microporosity, surface area, and nitrogen content, which together enhance CO2 adsorption affinity. When incorporated into Matrimid-based MMMs, the POPs significantly improved CO2 permeability and CO2/N2 selectivity, with the pp-tpta filler (containing the highest nitrogen content) delivering the most pronounced performance enhancement. Further optimization using a high-permeability 6FDA-DAM polyimide matrix yielded a membrane with a CO2 permeability of 1967 Barrer and a selectivity of 33.4 at 20 wt% pp-tpta loading, surpassing the 2008 Robeson Upper Bound. Solubility-diffusivity analyses, supported by both experimental measurements and molecular dynamics simulations, revealed that the pp-tpta filler enhances CO2/N2 separation primarily by increasing CO2 solubility and diffusivity within the membrane matrix. These results underscore the potential of rationally designed, nitrogen-rich POP fillers as effective, scalable materials for advanced gas separation membranes.
High-Resolution and Facile Patterning of Silver Nanowire Electrodes by Solvent-Free Photolithographic Technique Using UV-Curable Pressure Sensitive Adhesive Film
No full textPatterning of silver nanowires (AgNWs) used in fabricating flexible and transparent electrodes (FTEs) is essential for constructing a variety of optoelectronic devices. However, patterning AgNW electrodes using a simple, inexpensive, high-resolution, designable, and scalable process remains a challenge. Therefore, herein a novel solvent-free photolithographic technique using a UV-curable pressure sensitive adhesive (PSA) film for patterning AgNWs is introduced. The UV-curable PSA film can be selectively patterned by photopolymerization under UV exposure through a photomask. The AgNWs embedded in the non-photocured adhesive areas of the film are firmly held by a crosslinked network of photocurable resin when the patterned film is attached to the AgNW-coated substrate and additionally irradiated by UV light. After peeling off the film, the positive pattern of AgNW electrodes remains on the substrate, while the negative pattern is transferred to the film. This solvent-free photolithographic technique, which does not use toxic solvents, provides superior pattern features, such as fine line widths and spacings, sharp line edges, and low roughness. Therefore, the developed technique could be successfully applied in the development of flexible and transparent optoelectronic devices, such as a self-cleaning electro-wetting-on-dielectric (EWOD) devices, transparent heaters, and FTEs.11Nsciescopu
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