The characteristics of ammonia storage and the development of model-based control for diesel engine urea-SCR system

Tan Feng,Lin Lu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-

This paper investigates the characteristics of ammonia storage in actual SCR catalyst, which indicatesthat space velocities (SV), the exhaust temperature and NH3:NOX ratio (NSR) have different impacts onthe saturated ammonia storage and saturated time. Thus, this paper proposes an embeddable SCR modelconsisting of a nonlinear ammonia storage model (NAS model) and a multiple variable resistance–capacitance model with time-delay (MVRC model), in order to quantify the ammonia storage andsystem-out NOX concentration. After that, a model-based ammonia storage control strategy wasdeveloped to strike a better balance between high NOX reduction efficiency and low ammonia slip

Development of a variable resistance-capacitance model with time delay for urea-SCR system

Feng Tan,Lu Lin 대한환경공학회 2015 Environmental Engineering Research Vol.20 No.2

Experimental research shows that the nitric oxides (NOX) concentration track at the outlet of selective catalytic reduction (SCR) catalyst with a transient variation of Adblue dosage has a time delay and it features a characteristic of resistance-capacitance (RC). The phenomenon brings obstacles to get the simultaneously NOX expected to be reduced and equi-molar ammonia available to SCR reaction, which finally inhibits NOX conversion efficiency. Generally, engine loads change frequently, which triggers a rapid changing of Adblue dosage, and it aggravates the air quality that are caused by NOX emission and ammonia slip. In order to increase the conversion efficiency of NOX and avoid secondary pollution, the paper gives a comprehensive analysis of the SCR system and tells readers the key factors that affect time delay and RC characteristics. Accordingly, a map of time delay is established and a solution method for time constant and proportional constant is carried out. Finally, the paper accurately describes the input-output state relation of SCR system by using "variable RC model with time delay". The model can be used for a real-time correction of Adblue dosage, which can increase the conversion efficiency of NOX in SCR system and avoid secondary pollution forming. Obviously, the results of the work discover an avenue for the SCR control strategy.

TRIPLE SOLUTIONS FOR THREE-ORDER PERIODIC BOUNDARY VALUE PROBLEMS WITH SIGN CHANGING NONLINEARITY

Tan, Huixuan,Feng, Hanying,Feng, Xingfang,Du, Yatao The Korean Society for Computational and Applied M 2014 Journal of applied mathematics & informatics Vol.32 No.1

In this paper, we consider the periodic boundary value problem with sign changing nonlinearity $$u^{{\prime}{\prime}{\prime}}+{\rho}^3u=f(t,u),\;t{\in}[0,2{\pi}]$$, subject to the boundary value conditions: $$u^{(i)}(0)=u^{(i)}(2{\pi}),\;i=0,1,2$$, where ${\rho}{\in}(o,{\frac{1}{\sqrt{3}}})$ is a positive constant and f(t, u) is a continuous function. Using Leggett-Williams fixed point theorem, we provide sufficient conditions for the existence of at least three positive solutions to the above boundary value problem. The interesting point is the nonlinear term f may change sign.

Development of a Methodology to Monitor NOX Emission of urea-SCR System

Tan Feng,Lin Lü 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.5

In order to ensure the engine’s in-use emission performance, the heavy-duty On Board Diagnostics (OBD) are required by most of the regulations to be applied to all on-highway engines, whose key part is the NOX emissions monitoring with a defined NOX OBD threshold. In this paper, two different NOX emission prediction methods based on the tailpipe NOX sensor are proposed: Quasi-steady State Prediction method (QSP method) and Two-stage Integral Prediction method (TIP method), which were verified in the bench tests and field trial. And the test results show that the prediction errors of the two methods are within ± 0.5 g/kWh under high NH3 slip. Moreover, in addition to the high accuracy, QSP method can quickly spot the degradation of the SCR system, and thus can be adopted in the Adblue dosage control strategy to offer robustness.

Theoretical Analysis on the Pricing and Advertising Coordination of Multi Retailer Supply Chain from the Perspectives of Common Interest Maximization

Feng Li,Genfu Feng,Jian Tan 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.8

With the arrival of global economic integration, the enterprise gradually realized the joint and downstream enterprises form a complementary advantage on its importance to enhance the overall competitiveness of the supply chain. To deal with the corresponding challenges, in this paper, we conduct research on pricing and the advertising coordination of multi retailer supply chain from the general perspectives of common interest maximization. For the two stage supply chain consisting of a single manufacturer and single retailer as the background, study retailers to establish online channel and manufacturers to establish the online channel and applicable condition, the difference between two kinds of the channel model and double channel of supply chain coordination mechanism. The core idea of supply chain management is focus on supply chain node enterprise specializing in their core business, and outsources non-core business to other enterprises, so as to achieve supply chain of all enterprises focus on their good at business. Our research optimizes the traditional game theory framework to achieve the better model for the issues. The experimental analysis verifies the feasibility and the effectiveness of our approach compared with the others.

글로벌시대 중국아동문예의 민족화 경향연구

탄펑샤 ( Feng Xia Tan ) 한양대학교 동아시아문화연구소(구 한양대학교 한국학연구소) 2015 동아시아 문화연구 Vol.63 No.-

글로벌시대에 외국아동문예작품이 대량으로 중국에 들어왔다. 중국 본토의 원작아동문예작품들은 자신만의 특색을 갖춘 민족화의 길을 찾으며 그에 맞서고 있다. 아동문예 민족문화의 추구는 도화책, 환상소설, 에니메이션 등 여러 외래적인 요인으로 급속도로 발전한 유형에 나타나고 있다. 내용과 소재 예술표현 기교에서도 민족적 전통문화의 기호를 폭넓게 사용했다. 잠재된 전통문화의 정신적 기질을 담아냄으로써 어린이들이 전통문화에 대한 정확한 인식과 동감을 갖게 하고, 문화적 신분의 구축을 꾀하고자 하였다. 이러한 민족화 방향은 보수적인 민족주의를 의미하는것이 아니라, 민족화를 지향하는 동시에 이질적인 문화를 본보기로 삼아, 전통과 현대성의 간극에서 연계와 전환에 기울이기 위함이다. 민족문화와 외래문화 그리고 예술자원을 어떻게 통합하여 발전과 창신을 도모하는 것은 글로벌 시대에 중국 아동문예가 본토에서 자리 잡고 더불어 세계로 나아가는 중요한 과제이다. Lots of foreign children’s literature and arts have been coming into China in the global age so that Chinese native artists try to find a national way to compete with them. The pursuit of national style is mainly manifested through native picture books, fantasy and cartoons which have developed quickly under the foreign influence. The materials, subjects and artistic presentation techniques employ many nationally cultural signs and contain traditional spirits in order to cultivate children’s recognition of national culture and to construct their cultural identity. The national trend doesn’t mean to be conservative nationalism because they also borrow from foreign cultures while they pursue nationalization, paying attention to the connection and transformation between tradition and modernity. It is important for Chinese children’s literature and arts in the global period about how to integrate national and foreign sources of culture and arts to seek development and innovation.

Isolating and Identification of Seven New S-RNase Genes from Pyrus Pyrifolia in China

Xiao-Feng Tan,Tana Wuyun,T. Nnkanishi,Y. Takai,Xiu-Gen Li,Dang-Quan Zhang 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

TRIPLE SOLUTIONS FOR THREE-ORDER PERIODIC BOUNDARY VALUE PROBLEMS WITH SIGN CHANGING NONLINEARITY

Huixuan Tan,Hanying Feng,Xingfang Feng,Yatao Du 한국전산응용수학회 2014 Journal of applied mathematics & informatics Vol.32 No.1

In this paper, we consider the periodic boundary value problem with sign changing nonlinearity u′′′+ ρ³u = ∫(t,u), t∈2 [0,2π], subject to the boundary value conditions: u(i)(0) = u(i)(2π), i = 0,1,2, where ρ∈(0, 1/√3) is a positive constant and f(t,u) is a continuous function. Using Leggett-Williams fixed point theorem, we provide sufficient conditions for the existence of at least three positive solutions to the above boundary value problem. The interesting point is the nonlinear term f may change sign.

"The Hidden Melody" - Analysis of the Picture Composition of the Movie

Jing-Feng Tan(감경봉) 한국엔터테인먼트산업학회 2017 한국엔터테인먼트산업학회논문지 Vol.11 No.6

영화 화면은 영사막의 네모난 틀에 한정된다. 그러므로 영화화면은 그림틀과 비슷한 점이 있다. 화면은 물상을 어디에 놓으면 감독님의 의도를 잘 표현할 수 있다. 이런 문제가 바로 화면은 어떻게 구성한 문제이다. 감독님은 장면을 조정하고 미공사는 장면을 어떻게 설계하는 문제도 있다. 아무 평면 유한한 공간에 이미지 설계를 진행하는 것은 모두 그림예술이다. 영화는 조형 예술이고 삼차원 공간이 여기에 충분히 표현할 수 있다. 동시에 이차원 형식에 표현력을 가지고 있다. 구도는 영화화면의 형식 언어 중에서 하나이다. 영화 미술에서 뛰어난 화면 구도 설계가 영화의 심미 가치와 예술 가치를 표현하기가 아주 중요한 역할을 가진다. 관중들이 영화를 감상할 때 첫 번째 느낀 것은 영화의 시각 원소이다. 영화 구도는 먼저 관중들에게 아주 독특한 심미적인 체험을 주어야 한 다음에 시각적인 미감을 나타낼 수 있다. 그리고 영화구도는 영화 미술가의 독특한 예술 개성을 놓아야 한다. 이렇게 한다면 남다른 영화를 제작할 수 있는 중요한 원인이다. 마지막, 구도는 전체 영화 작품을 중심으로 설계해야 하고 줄거리를 발전시키고 영화의 주지를 표현할 수 있도록 한다. The image of cinema description is limited within the frame of the screen; this constitutes the similarities between cinema description and picture frame. In other words, there is a problem about cinema description as to how to place image at a position that could express the director"s intention most appropriately - the composition of cinema description, or how directors do the mise-en-scine and how art designers design the scene. Any art that involves image-building in a flat and limited space can be regarded as painting art. Film is a plastic art, in which three-dimensional space can be fully demonstrated; but, it also has expressive force in two-dimensional form. Composition is also the most important form of formal language in cinema description. With respect to fine art in film, excellent composition is extremely important for the realization of the film"s aesthetic value and artistic value. When watching a movie, the audiences first come into contact with visual elements. Film composition need to bring a unique aesthetic experience to audiences, reflecting its visual beauty. Moreover, the unique artistic personality of film artist ought to be integrated into film composition, which is the key to make a film different. Finally, the overall film should be at the core of composition design, only in this way can it promote the development of the story and reveal and elaborate the film"s subject.

Crude Dietary Polysaccharide Fraction Isolated from Jackfruit Enhances Immune System Activity in Mice

Yin-Feng Tan,Hai-Long Li,Wei-Yong Lai,Jun-Qing Zhang 한국식품영양과학회 2013 Journal of medicinal food Vol.16 No.7

Crude polysaccharides (PSs) were isolated from the fruit pulp of jackfruit, and their chemical composition determined and evaluated for an immune regulatory activity in mice. The PSs were isolated from water extracts of jackfruit pulp ( JFP) using the ethanol precipitation method. The resulting precipitates were further purified by dialysis and protein depletion by the Sevage method. The phenol–sulfuric method was used to determine the content of the PSs. The composition of PSs was determined by the Sephadex-G200 column chromatography and high-performance liquid chromatography methods. The thymus index and macrophage phagocytic function methods in mice were used to evaluate the immune regulatory activity of JFP-PSs. The JFP-PSs content in jackfruit was about 21% (w/w) and the yield of crude PSs was 3.91%. The single molecular mass weight PS was the main constituent of JFP-PSs. The major monosaccharide residues were rhamnose, glucose, galactose, and arabinose. The JFP-PSs enhanced the thymus weight index and the phagocytic rate after 30 days of subchronic p.o. administration to mice at 4.5 mg/kg. The JFP contains single molecular PS and JFP-PS has immunestimulating activities in mice. These data suggest that at least some of the traditional uses of JFP can be ascribed to its immunomodulatory effects.