Browsing by Author "Lin, WL"

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An intelligent model for stock investment with buffett strategy, classifier system, neural network and linear programming
(2004)
Chen, AP
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Lin, WL
;
Chen, YC
;
資訊管理與財務金融系註：原資管所+財金所
;
Department of Information Management and Finance
"The Intelligent Model for Stock Investment with Buffett Strategy, Classifier System, Neural Network and Linear Programming" was studied for developing an intelligent model which call learn more knowledge regarding to stock investment with artificial intelligence technology. Classifier system, neural network, fundamental financial investment factors and linear programming are the fundamental components for the research. Knowledge transformation and Genetic evolution capability was discussed in the article, too. Furthermore, the investment strategy developed by Warren E. Buffett[17], the great financial investment master, was the major knowledge which was practiced in the article. For realizing more detail about learning system, a lot of topics regarding to artificial intelligence were discussed in advanced. including "A Market-Based Rule Learning System" [1], "Dynamic Trading Strategy Learning Model using Learning Classifier System" [2], "'Nonlinear Index Prediction" [3], "Financial Decision Support with Hybrid Genetic and Neural Based Modeling Tool" [4] and "Fuzzy Interval methods in Investment risk Appraisal" [5]. According to the Study mentioned above, the ideas to give intelligent model, especially with genetic algorithm, bring the direction for the advanced financial investment strategy and operation. Therefore, it was why a novel intelligent model with Buffett strategy, classifier system, neural network and linear programming proposed in the article.
An XCS-based intelligent searching model for cross-organization identity management in web service
(2004)
Lo, CC
;
Lin, WL
;
Wu, J
;
資訊管理與財務金融系註：原資管所+財金所
;
Department of Information Management and Finance
Internet services in distributive organization are normally built on an open network environment. In the environment internet service provisioning cannot be expected executing in a single close organization [1]. Identity management in cross-organization becomes an issue for handling Internet service and distributive business process. The "identity" in cross-organization web service is defined as global identity rather than private identity from client. Global identity searching; table that registers all related service organization is the normal way we used to [2]. Through global identity searching table the target service organization can be looked up directly. For some business program, however, global identity is not necessary registered in specific service organization, e.g. IMSI (International Mobile Subscriber Identification) registration in NP (Number Portability) Service [3], for instance. In NP Service each IMSI can be re-assigned to different mobile service provider if the IMSI apply the re-assigmnent. In the example about IMSI in NP service mentioned above, if there is an internet service will be executed according to identity management with IMSI, then it will be a challenge to find the organization for available IMSI in very short response time. To dynamically re-assign a IMSI in different mobile service provider, the traditional global identity searching table will not be practical due to frequently changing the registration of IMSI in different service provider. To give an intelligent searching model for cross-organization global identity management is a better way than a static global identity searching table management in Web service. In this article the XCS (eXtended Classifier System) classifier system [4] will be proposed as the kernel system. With the characteristics in machine learning and rules management, the XCS-based intelligent searching model can help to predict where the web service can find the global identity in the open and cross-organization environment.
Calix[4]arenes with a lid in their upper rims: 1,3-dipolar cycloaddition reactions of benzonitrile oxides with 5-allyl-, 5,11-dially- and 5,17-diallylcalix[4]arenes
(2000-02-01)
Shu, CM
;
Lin, WL
;
Lee, GH
;
Peng, SM
;
Chung, WS
The upper rim substituted mono- and diisoxazolinomethylcalix[4]arenes 9-23 are synthesized in good yields from 1,3-dipolar cycloaddition reactions of para-substituted phenyl nitrileoxides with 5-allyl-, 5,11-diallyl- and 5,17-diallycalix[4]arenes 5-7; the structures of 9-23 are consistent with a 'cone' conformation and the 'vase-with-a-lid' structure of 11 was confirmed by a single-crystal x-ray analysis. Preliminary results show that the monoisoxazolinomethylcalix[4]arene can form an inclusion complex with ammonium cation.
Dynamic spatial modeling approach for estimation of internal phosphorus load
(1998-01-01)
Kao, JJ
;
Lin, WL
;
Tsai, CH
;
環境工程研究所
;
Institute of Environmental Engineering
The effect of the pollution load generated internally from a reservoir on the effectiveness of an eutrophication control plan is significant and has gained increasing attention recently. Accurate estimation of the internal load is difficult because of its spatial and temporal variation. A procedure using a dynamic spatial modeling approach is proposed to improve the estimation. A case study of Posan off-stream reservoir is described to demonstrate the implementation of the procedure for data collection and model preparation, field sampling planning and investigation, laboratory analysis for phosphorus releasing rates, model integration of AGNPS and WASP, calibration and verification of the integrated model, and the internal load estimation. The procedure is expected to provide appropriate temporal and spatial phosphorus internal load estimation for an off-stream reservoir. (C) 1998 Elsevier Science Ltd. All rights reserved.
Dynamic spatial modeling approach for estimation of internal phosphorus load
(1998-01-01)
Kao, JJ
;
Lin, WL
;
Tsai, CH
;
環境工程研究所
;
Institute of Environmental Engineering
The effect of the pollution load generated internally from a reservoir on the effectiveness of an eutrophication control plan is significant and has gained increasing attention recently. Accurate estimation of the internal load is difficult because of its spatial and temporal variation. A procedure using a dynamic spatial modeling approach is proposed to improve the estimation. A case study of Posan off-stream reservoir is described to demonstrate the implementation of the procedure for data collection and model preparation, field sampling planning and investigation, laboratory analysis for phosphorus releasing rates, model integration of AGNPS and WASP, calibration and verification of the integrated model, and the internal load estimation. The procedure is expected to provide appropriate temporal and spatial phosphorus internal load estimation for an off-stream reservoir. (C) 1998 Elsevier Science Ltd. All rights reserved.
Experimental observation and conjugated heat transfer analysis of vortex flow development in mixed convection of air in a horizontal rectangular duct
(1996-11-01)
Lin, WL
;
Ker, YT
;
Lin, TF
;
機械工程學系
;
Department of Mechanical Engineering
A combined flow visualization and conjugated heat transfer analysis was carried out to study the axial evolution of the buoyancy induced secondary vortex flow in a mixed convective air flow through a bottom heated horizontal rectangular duct. In the experiment the cross plane secondary flow was visualized at selected cross-sections. While in the conjugated analysis, the unsteady three-dimensional Navier-Stokes and energy equations for the flow were coupled with the unsteady two-dimensional conduction equations for the solid walls and were solved together numerically. Results were obtained for the Reynolds number ranging from 35 to 102 and Grashof number from 1600 to 5.8 x 10(5), covering the steady and time periodic flows. Both the experimental and numerical results clearly showed the generation of the longitudinal vortex rolls in the entry half of the duct and the merge of these rolls downstream. At higher buoyancy-to-inertia ratio more rolls were generated and they merged into fewer and larger rolls. Significant conjugated heat transfer effects were noted from the numerical results. Copyright (C) 1996 Elsevier Science Ltd.
Experimental observation and conjugated heat transfer analysis of vortex flow development in mixed convection of air in a horizontal rectangular duct
(1996-11-01)
Lin, WL
;
Ker, YT
;
Lin, TF
;
機械工程學系
;
Department of Mechanical Engineering
A combined flow visualization and conjugated heat transfer analysis was carried out to study the axial evolution of the buoyancy induced secondary vortex flow in a mixed convective air flow through a bottom heated horizontal rectangular duct. In the experiment the cross plane secondary flow was visualized at selected cross-sections. While in the conjugated analysis, the unsteady three-dimensional Navier-Stokes and energy equations for the flow were coupled with the unsteady two-dimensional conduction equations for the solid walls and were solved together numerically. Results were obtained for the Reynolds number ranging from 35 to 102 and Grashof number from 1600 to 5.8 x 10(5), covering the steady and time periodic flows. Both the experimental and numerical results clearly showed the generation of the longitudinal vortex rolls in the entry half of the duct and the merge of these rolls downstream. At higher buoyancy-to-inertia ratio more rolls were generated and they merged into fewer and larger rolls. Significant conjugated heat transfer effects were noted from the numerical results. Copyright (C) 1996 Elsevier Science Ltd.
Experimental study of unstable mixed convection of air in a bottom heated horizontal rectangular duct
(1996-05-01)
Lin, WL
;
Lin, TF
;
機械工程學系
;
Department of Mechanical Engineering
An experiment was carried out to investigate the buoyancy induced spatial and temporal flow transition and the associated heat transfer processes in a mixed convective air flow through a bottom heated horizontal rectangular duct, by measuring the local heat transfer coefficient, spanwise temperature distributions, air temperature variation with time at selected locations and by visualizing the cross plane secondary flow for the Reynolds numbers ranging from 9 to 186 and the Grashof numbers up to 5 x 10(6). The results indicated that the heat transfer enhancement is due to the formation and development of a buoyancy driven secondary vortex flow. The onset of thermal instability was found to move upstream for a higher Grashof number and to be delayed for a larger Reynolds number. At increasing Grashof numbers the measured spanwise time-averaged fluid temperature distributions and the corresponding instantaneous flow visualizations clearly show the formation of secondary vortex flow and the changes in the flow structures. At slightly supercritical Grashof numbers, the secondary flow is in the form of two pairs of longitudinal rolls with the vortex flow ascending along the side walls. For higher Grashof numbers the vortex rolls rotate in opposite directions, with the secondary flow descending near the side walls. At even higher Grashof numbers, merging of the vortices takes place and only one pair of vortex rolls exist. Furthermore, raising the Grashof. number or lowering the Reynolds number causes the flow to change from a laminar time periodic to a transitional quasiperiodic and even to a chaotic turbulent state. Based on the present data, a regime map delineating the temporal state of the flow and a correlating equation for the Hopf bifurcation were proposed.
Observation and computation of vortex and/or reverse flow development in mixed convection of air in a slightly inclined rectangular duct
(1997-11-01)
Lin, WL
;
Lin, TF
;
交大名義發表
;
機械工程學系
;
National Chiao Tung University
Combined pow visualization and conjugated numerical heat transfer analysis were carried out to study the axial evolution of the buoyancy induced secondary vortex and reverse pow in a mixed convective air pow through a bottom heated, slightly inclined rectangular duct. Results were obtained for the Grashof number Gr ranging from 1.6 x 10(3) to 2.8 x 10(5), inclined angle phi from -20 deg to 26 deg and the Reynolds number Re below 102 covering the steady and time dependent flows. For the buoyancy-opposing case, at a certain critical buoyancy-to-inertia ratio depending on the Re and phi both the experimental and numerical results clearly showed the generation of the longitudinal vortex rolls in the entry half of the duct and a slender reverse pow zone was induced near the exit end of the duct. At a higher buoyancy-to-inertia ratio the stronger reverse flow moves upstream and is in a time periodic snaking motion which is considered to result from the Kelvin-Helmholtz instability associated with the two counter flow streams, namely, the downstream moving longitudinal vortex rolls and the upstream moving reverse flow. Through the viscous shearing effects the strong snaking reverse flow induces a number of eddies moving along it and the longitudinal rolls are pushed towards the duct sides. This strong interaction between the vortex flow and reverse pow leads to an earlier transition to turbulence. A correlation equation was proposed for the penetration length of the reverse flow. However for buoyancy-assisting pow no reverse flow is induced and the longitudinal vortex rolls prevail for the buoyancy-to-inertia ratio up to 2.8 X 10(5). Significant conjugated heat transfer effects were noted from the numerical results.
Observation and computation of vortex and/or reverse flow development in mixed convection of air in a slightly inclined rectangular duct
(1997-11-01)
Lin, WL
;
Lin, TF
;
機械工程學系
;
Department of Mechanical Engineering
Combined pow visualization and conjugated numerical heat transfer analysis were carried out to study the axial evolution of the buoyancy induced secondary vortex and reverse pow in a mixed convective air pow through a bottom heated, slightly inclined rectangular duct. Results were obtained for the Grashof number Gr ranging from 1.6 x 10(3) to 2.8 x 10(5), inclined angle phi from -20 deg to 26 deg and the Reynolds number Re below 102 covering the steady and time dependent flows. For the buoyancy-opposing case, at a certain critical buoyancy-to-inertia ratio depending on the Re and phi both the experimental and numerical results clearly showed the generation of the longitudinal vortex rolls in the entry half of the duct and a slender reverse pow zone was induced near the exit end of the duct. At a higher buoyancy-to-inertia ratio the stronger reverse flow moves upstream and is in a time periodic snaking motion which is considered to result from the Kelvin-Helmholtz instability associated with the two counter flow streams, namely, the downstream moving longitudinal vortex rolls and the upstream moving reverse flow. Through the viscous shearing effects the strong snaking reverse flow induces a number of eddies moving along it and the longitudinal rolls are pushed towards the duct sides. This strong interaction between the vortex flow and reverse pow leads to an earlier transition to turbulence. A correlation equation was proposed for the penetration length of the reverse flow. However for buoyancy-assisting pow no reverse flow is induced and the longitudinal vortex rolls prevail for the buoyancy-to-inertia ratio up to 2.8 X 10(5). Significant conjugated heat transfer effects were noted from the numerical results.
Stabilization of buoyancy-driven unstable vortex flow in mixed convection of air in a rectangular duct by tapering its top plate
(2000-02-01)
Tseng, WS
;
Lin, WL
;
Yin, CP
;
Lin, CL
;
Lin, TF
Stabilization of the buoyancy-driven unstable mixed convective vortex air flow in a bottom heated rectangular duct by tapering its top plate is investigated experimentally. Specifically, the duct is tapered so that its aspect ratio at the duct inlet is 4 and gradually raised to 12 at the exit of the duct. In the study the secondary flow in the duct is visualized and the steady and transient thermal characteristics of the flow are examined by measuring the spanwise distributions of the time-average temperature. The effects of the Reynolds and Grashof numbers on the vortex flow structure are studied in detail. Moreover, the spanwise-averaged Nusselt numbers for the horizontal rectangular and tapering ducts are also measured and compared. Furthermore, the time records of the air temperature are obtained to further detected the temporal stability of the flow. Over the ranges of the Re and Gr investigated for 5 less than or equal to Re less than or equal to 102 and 1.0X10(4)less than or equal to Gr less than or equal to1.7X10(5), the vortex flow induced in the rectangular duct exhibits temporal transition from a steady laminar to time periodic and then to chaotic state at increasing buoyancy-to-inertia ratio. Substantial change in the spatial structure of the vortex flow is also noted to accompany this temporal transition. The results for the tapering duct indicate that more vortex rolls can be induced due to the increase in the aspect ratio of the duct with the axial distance. But the vortex rolls are weaker and are completely stabilized by the tapering of the top plate.
Unstable aiding and opposing mixed convection of air in a bottom-heated rectangular duct slightly inclined from the horizontal
(1996-02-01)
Lin, WL
;
Lin, TF
;
交大名義發表
;
機械工程學系
;
National Chiao Tung University
Buoyancy-induced secondary vortex and reverse flows, flow transition, and the associated heat transfer processes in mixed convection of air through a bottom heated inclined rectangular direct were investigated experimentally. The local spanwise-averaged heat transfer coefficient and air temperature variations with time at selected locations were measured and the cross plane secondary flow was visualized for the Reynolds number ranging from 35 to 186, Grashof number up to 5 X 10(6), and -20 degrees less than or equal to phi less than or equal to 26 degrees. The results indicated that the heat transfer enhancement is due to the presence of the buoyancy-driven secondary vortex flow and/or reverse flow. The onset of thermal instability was found to move upstream for a larger negative inclined angle (opposing convection) and/or a higher Grashof number and to be delayed for a larger positive inclined angle (aiding convection) and/or a higher Reynolds number. At increasing Grashof number, the instantaneous flow visualizations clearly showed the changes of the vortex flow and/or reverse flow structures in the downstream section of the duct. At slightly supercritical Grashof numbers the secondary flow is in the form of two pairs of longitudinal rolls with the vortex flow ascending along the side walls. For higher Grashof numbers the vortex rolls rotate in the opposite direction with the secondary flow descending near the side walls and the flow was found to be time periodic. At even higher Grashof numbers in opposing convection the buoyancy induced reverse flow exists and the flow is quasi-periodic. Further raising the Grashof number or lowering the Reynolds number causes the flow to change from a transitional quasi-periodic state to a chaotic turbulent stale.
Wavelet-based images compression of color document by fuzzy picture-text segmentation
(2003-01-01)
Wu, BF
;
Chiu, CC
;
Lin, WL
;
電控工程研究所
;
Institute of Electrical and Control Engineering
In this paper, we present a new compression method for color document images based on the wavelet transform and fuzzy picture-text segmentation. This approach addresses a fuzzy picture-text segmentation method, which separates pictures and texts by using wavelet coefficients from color document images. The picture components and the text components are encoded by zerotree wavelet coding and by the modified run-length Huffman coding, respectively.