• 한국막학회:학술대회논문집
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• 한국막학회 1994년도 추계 총회 및 학술발표회
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• pp.8-11
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• 1994

Disposal of hazardous ions in the aqueous streams is a significant industrial waste problem.. Waste streams from electronics, electroplating, and photographic industries contain metal ions such as copper, nickel, zinc, chromium(IV), cadmium, aluminum, silver, and gold, amongst others in various aqueous solutions such as sulfates, chlorides, fluorocarbons, and cyanides. Typical plating solutions having similar compositions are listed in Table 1. Spent process streams in catalyst manufacturing facilities also contain precious metals such as Ag, Pt, and Pd. Developing an effective recovery process of these metal ions for reuse is important.

• Journal of information and communication convergence engineering
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• 제3권2호
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• pp.93-95
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• 2005

In order to create security session, security keys are preconfigured between communication objects. For this purpose, Handshake Protocol exists. The pre-master secret key that is used in this process needs to interpreted by a server to create master secret key, whose process requires a big calculation, resulting in deteriorating system's transmission performance. Therefore, it is helpful in increasing transmission speed to reuse secret keys rather than to create them at every connection.

• 한국염색가공학회지
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• 제30권1호
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• pp.51-61
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• 2018

In this study, effluent water was produced through Submerged Membrane Bio-Reactor(SMBR) process, which is a simple system and decomposes organic matter contained in wastewater with biological treatment process and performs solid-liquid separation, Especially, ozone oxidation treatment process is applied to effluent water containing fluorescent whitening agent, which is a trace pollutant which is not removed by biological treatment, and influences the quality of reused water. The concentration of $COD_{Cr}$ in the SMBR was $449.3mg/{\ell}-COD_{Cr}$, and the concentration of permeate water was $100.3mg/{\ell}-COD_{Cr}$. The removal efficiency was about 70.1%. The amount of ozone required for the removal of the fluorescent whitening agent in the permeated water in SMBR was $6.67g-O_3/min$, and the amount of ozone required to remove $COD_{Mn}$ relative to the permeate water was calculated to remove $0.997mg-COD_{Mn}$ for 1mg of $O_3$.

• 한국콘텐츠학회논문지
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• 제21권11호
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• pp.350-360
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• 2021

코로나19와 최저임금의 영향으로 비대면 결제 수단인 키오스크의 도입률이 2018년에 급격하게 상승하였다. 키오스크에 어려움을 가진 사용자가 존재함에도 키오스크는 외식산업에서 꾸준한 성장세를 나타내고 있다. 이에 본 연구는 키오스크의 지속사용에 영향을 미치는 만족도의 선행 요인을 품질 차원에서 확인하고자 하였으며, 가장 널리 활용되고 있는 패스트푸드점 키오스크 이용자 전체를 대상으로 조사를 시행했다. 연구 결과 키오스크의 정보 접근성(환경 품질), 주문 과정 편의성(과정 품질), 부가 서비스 혜택 추가(과정 품질)는 사용자 만족도에 영향을 주어 궁극적으로 지속사용 의도에 영향을 미치는 것으로 나타났으며, 결과품질인 주문결제 용이성은 만족도에 영향을 미치지 않는 것으로 나타났다. 점차 비대면 결제가 일반화/필수화되어가는 시점에서 이루어진 본 연구는, 키오스크 이용자에 대한 지식을 확장하였으며, 이용자의 만족도와 지속사용을 제고할 수 있는 키오스크 품질 요인을 규명하여 궁극적으로 매장의 키오스크 선택 기준을 제시하고 매장 경쟁력을 확보하는 데에 시사점을 제공하고 있다.

• 한국정보통신학회논문지
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• 제13권9호
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• pp.1851-1857
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• 2009

본 논문은 소모 전력 계산을 위해 회로를 구현하고자 FPGA 기술 매핑을 위한 소모 전력을 고려한 재사용 모듈 생성 알고리즘을 제안한다. 제안한 알고리즘은 FPGA 기술 매핑을 위해 사용되는 재사용 모듈에 대해 소모 전력을 고려하여 RT 라이브러리를 생성하는 알고리즘이다. 소모 전력 계산을 위해 회로를 구현하고자 하는 FPGA를 선정한다. 선정된 FPGA를 구성하고 있는 LUT의 조건을 고려하여 전체 소모 전력이 최소가 되도록 기술 매핑을 수행한다. 이러한 정보를 이용하여 할당된 결과의 모듈들 중에서 주어진 소모 전력에 맞는 모듈을 선정하여 회로를 구현한다.

• 한국정밀공학회지
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• 제31권7호
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• pp.597-604
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• 2014

High efficiency production requires the improved performance of CAD/CAM system. Although the CAD and CAM have been significantly developed over the last three decades, they must still study on the reuse of information during process. In this study, we developed a new integrated CAD/CAM system which can reuse the information generated in previous processes, in order to improve its performance. In addition, the developed system was verified by comparing with working-time, and system reproducibility was also examined with tolerance in the unmanned operation. Experimental results showed 58% reduction in working-time of 2D Auto-CAM module, 80% in case of 3D Auto-Exchange module, and 54.5% in case of Auto-Design module.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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• pp.287-292
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• 2002

In the 1970's, the environmental preservation is out of public issue, caused by rapid economic growth and industrialization. When the people's living standard Is grows, they aware of the environmental importance. In modern times, the environment preservation is global tendency and self social awareness is arise. Measures to the environment preservation and pollution is going on study. One measure is recycling and reuse of by product and it is already developed in some advanced country. But, the study about by product reuse is just beginning in domestic. The purpose of this study is reusing copper slag by product which produced in the copper refining process-as fine aggregate for developing high strength concrete. Concrete nix and properties, the result of mock up test for site application are analyzed.

• JSTS:Journal of Semiconductor Technology and Science
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• 제12권2호
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• pp.203-211
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• 2012

This paper proposes a $16{\times}16$ and $32{\times}32$ inverse transform architecture for HEVC (High Efficiency Video Coding). HEVC large transform of $16{\times}16$ and $32{\times}32$ suffers from huge computational complexity. To resolve this problem, we proposed a new large inverse transform architecture based on hardware reuse. The processing element is optimized by exploiting fully recursive and regular butterfly structure. To achieve low area, the processing element is implemented by shifters and adders without multiplier. Implementation of the proposed 2-D inverse transform architecture in 0.18 ${\mu}m$ technology shows about 300 MHz frequency and 287 Kgates area, which can process 4K ($3840{\times}2160$)@ 30 fps image.

• 대한산업공학회지
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• 제34권1호
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• pp.32-41
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• 2008

This paper studies a joint EOQ and EPQ model in which a stationary demand can be satisfied by recycled products as well as newly purchased products. The model assumes that a fixed quantity of the used products are collected from customers and later recovered for reuse. The recovered products are regarded as perfectly new ones. We also assume that the number of orders for newly purchasing items and the number of recovery setups in a cycle can be mutually independent integers. Under these assumptions, we develop an optimization model obtaining the economic order quantity for newly procured products, the optimal lot size for the recovery process, and the sequence of the orders and the setups, simultaneously. And then a simple solution procedure to find a local optimal control parameter set is proposed. To validate the model and the solution procedure, finally, some computational experiments are presented.

• 한국포장학회지
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• 제15권3호
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• pp.105-111
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• 2009

In this work, source reduction of poly ethylene terephthalate (PET) packaging are discussed as aspect of sustainability, such as reuse, refill and recycling through the various treatment methods and historical studies for municipal solid waste (MSW) disposal. Since PET has good chemical, physical and mechanical properties, and provides good oxygen and carbon dioxide barrier properties, PET is one of the most widely used thermoplastic polyester in the U.S. and around the world. As the demand for non-renewable PET is increasing, several approaches have been developed to meet economical feasibility and environmental responsibility without degrading material performance. Several companies, such as Coca-Cola Co., Easterform Packaging Co. and Kraft, have tried to develop lightweight PET bottle, and some of lightweight PET bottles are already commercialized. Reuse and refilling for PET container is well developed in Europe, such as Denmark, German and Netherland by supportive legislation and policies. Recycling process is the best way to economically reduce PET waste. In consequence, advanced technique and further development must be provided due to increasing PET packaging waste.