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김종부,신명국,성낙환,최문정,김경주,이동석 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.A
This experiment was done to investigate the leaching and adsorption properties of heavy metals on porphyry. The comparison with respect to the leachability of heavy metals from porphyry between the Korea Standard Leaching Test (KSLT) and the Toxicity Characteristic Leaching Procedure (TCLP) was carried out. The fractional composition of leachate and the total concentration of heavy metal of porphyry were studied through Sequential Extraction Procedure (SEP) and EPA Method 3050. Adsorption experiment of porphyry has pointed out that the optimum dosage of porphyry for 50ppm Pb was over 10g/L, the effective particle size for absorption was below 200 mesh and the optimum pH was about 7. From the Freundlich' adsorption equation, l/n was 1.0722, and k was 0.0041. After adsorption, the fractional composition of Pb was changed. The exchangeable, carbonate, reducible fractions were increased, and the organic fraction was not changed, and the residual fraction was decreased.
Almost Sure Convergence of ILC for Networked Linear Systems with Random Link Failures
Dong Shen 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.2
The iterative learning control (ILC) problem for networked linear system with random link failure isaddressed in this paper. The link failures arise both from the controller to the plant and from the plant to thecontroller. The random link failure is modeled by an independent Bernoulli random variable. Two P-type updatelaws are designed and critically analyzed. The almost sure convergence property is established according to thiscase for the first time. Illustrative simulations show the effectiveness of the proposed algorithms.
Branded there, made here? How country equity influences fashion product consumers in China
Shen Dong,Liu Feng,Richards Joseph 한국마케팅과학회 2021 Journal of Global Fashion Marketing Vol.12 No.4
After decades of globalization, more and more products are made in a country different from the initial country of origin of the brand name associated with the product. As consumers evaluate brands, does it matter if a product is made in the same country as from its initial origin? In this study, we intend to address this question by examining the impacts of country equity (CE) on consumer psychology, in the context of China’s fashion market. Specifically, this study aims to (1) examine the impact of CE on Chinese consumers’ perception and purchase intention of “Made in USA” products; and (2) identify potential China’s market for “Made in USA” products. A series of hypotheses are developed and empirically tested. Among our major findings, Chinese consumers show significantly higher purchase intention, perceived quality, and perceived price for “Made in USA” products than “Made in China” products with the same brand name. Also, Chinese consumers’ CE of the US significantly affect their purchase intention, perceived quality, and perceived price of “Made in USA” products. In addition, we identify the target market characteristics of “Made in USA” products in China. The study adds to a comprehensive understanding of CE in the global market.
Mathematical models for manufacturing a novel gear shaper cutter
Shen-Wang Lin,Cheng-Shun Han,Jiu-Bin Tan,Shen Dong 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.1
The design principle and models for novel error-free shaper cutters are discussed to improve the accuracy and service life of gear cutting tools. The modified methods for designing the tooth profile of the shaper cutter are developed by including the inverse envelope method, midpoint-midline method and midpoint-displacement method based on the theory of geometrical reverse problem. The universal mathematical models for manufacturing optimal tooth profile of shaper cutters are presented. The feasibility and reliability of the proposed principle, methods and models are proved by combining the numerical examples with practical application. The design method suggested in this paper is superior to the traditional design scheme, and will be helpful in facilitating the design and manufacture of shaper cutters.
The New Ecosystem of Cross-border E-Commerce among Korea, China and Japan Based on Blockchain
Xiang-Dong Shen,Xi Chen,Ran Ji,Ren-Hong Wu 한국무역학회 2020 Journal of Korea trade Vol.24 No.5
Purpose - The purpose of the study is to propose a theoretical framework of cross-border e-commerce ecosystems based on blockchain technology. The ecosystem includes five systems, namely, crossborder supply chain intelligent system, cross-border logistics system, cross-border payment system, cross-border product quality traceability system and cross-border customs supervision system. Design/methodology - This study firstly derived the main improvement factors for the new ecosystem based on blockchain through prior research and expert interviews on cross-border e-commerce. Then explored the use of virtue of decentralization, anti-counterfeiting traceability, consensus mechanism, smart contract and other means of the core technology of blockchain to overcome the bottleneck of cross-border e-commerce development among Korea, China, and Japan. Finally, proposed valuable implications in both theoretical and practical perspectives. Findings - As a result, we combined with the problems existing in cross-border e-commerce among Korea, China and Japan, this paper proposes a solution based on blockchain. On this basis, it constructs a cross-border e-commerce ecosystem among these three countries, including five systems. In addition, we discuss the main problems existing in the current blockchain, such as low transaction concurrency, security loopholes, and inconsistent standards, the corresponding countermeasures are proposed from the technical level, security level and industry standards. Originality/value - This study is the first to apply the blockchain technology to solve the cross-border e-commerce problems in Korea, China and Japan, which is of pioneering significance in both literature and practice. Block chain technology is in the ascendency. This study provides technical solutions for promoting the development of cross-border e-commerce import and export trade between Korea, China and Japan.
스케일불변 특징의 삼차원 재구성을 통한 이동 로봇의 상대위치추정
申東范(Dong-Fan Shen),吉世基(Se-Kee Kil),李鍾實(Jong-Shill Lee),柳劑群(Je-Goon Ryu),李應赫(Eung-Hyuk Lee),洪勝弘(Seung-Hong Hong) 대한전기학회 2006 전기학회논문지 D Vol.55 No.4
A key component of autonomous navigation of intelligent home robot is localization and map building with recognized features from the environment. To validate this, accurate measurement of relative location between robot and features is essential. In this paper, we proposed relative localization algorithm based on 3D reconstruction of scale invariant features of two images which are captured from two parallel cameras. We captured two images from parallel cameras which are attached in front of robot and detect scale invariant features in each image using SIFT(scale invariant feature transform). Then, we performed matching for the two image's feature points and got the relative location using 3D reconstruction for the matched points. Stereo camera needs high precision of two camera's extrinsic and matching pixels in two camera image. Because we used two cameras which are different from stereo camera and scale invariant feature point and it's easy to setup the extrinsic parameter. Furthermore, 3D reconstruction does not need any other sensor. And the results can be simultaneously used by obstacle avoidance, map building and localization. We set 20㎝ the distance between two camera and capture the 3frames per second. The experimental results show ±6㎝ maximum error in the range of less than 2m and ±15㎝ maximum error in the range of between 2m and 4m.
난분해성 COD를 함유한 산업폐수처리의 응집제 활용 방안
신동호(Dong-Hao Shen),화우(Yu Hua),임봉수(Bong-Su Lim) 대전대학교 환경문제연구소 2013 환경문제연구소 논문집 Vol.17 No.-
The purpose of this study is to get basic data for the application of coagulants for treating an industrial wastewater containing NBD COD. The NBD COD concentration of the target wastewater was calculated to be 61 mg/L, which was about 72% of the first stage treated water, and this shows that there must be advanced wastewater treatment process. When Alum(8%) was injected in raw the water, 150ppm was the best dosage and 41% CODmn removal efficiency was obtained. When Alum(8%) was injected in the discharge water, 150ppm was the best dosage, and 19% CODmn removal efficiency was obtained. When powdered activated carbon was injected, 40ppm was the best dosage, 26% CODmn removal efficiency was obtained. The method of injecting Alum(8%) in the discharge water was suitable, when the effluent exceeds the water quality standard by 20%, and the method of injecting the powdered activated carbon was suitable, when the effluent exceeds the water quality standard by 20~40%.