On the feasibility of constrained linear control problems with application to the ALSTOM gasifier

2005 ◽  
Vol 219 (3) ◽  
pp. 207-213 ◽  
Author(s):  
I K Kookos
Keyword(s):  
Problem Formulation ◽  
Control Law ◽  
Control Problems ◽  
Satisfactory Solution ◽  
Control Effort ◽  
Control Community ◽  
Academic Control ◽  
And Control ◽  
Process Constraints

In 1997 the ALSTOM Power Technology Centre issued an open challenge to the academic control community, which addressed the control of a gasifier plant at three different production levels. Despite the numerous attempts and control methodologies that have been applied to the ALSTOM benchmark case study no satisfactory solution has yet been presented. This work aims to study the feasibility of the gasifier control problem. It is shown that the problem formulation corresponds to an infeasible problem. More specifically, operation at nominal conditions (100 per cent load) is shown to be easy and minimum control effort is required to satisfy process specifications. Operation, on the other hand, at the 0 per cent load conditions is infeasible and as a result no control law can be found that satisfies all process constraints. In the light of the findings of this study it is recommended that the ALSTOM benchmark gasifier problem should be modified to alleviate the infeasibility problem.

Force Feedback in Adaptive Trusses for Vibration Isolation in Flexible Structures

1997 ◽  
Vol 119 (3) ◽  
pp. 365-371 ◽  
Author(s):  
W. W. Clark ◽  
H. H. Robertshaw
Keyword(s):  
Vibration Isolation ◽  
Force Feedback ◽  
Flexible Structures ◽  
Control Law ◽  
Control Problems ◽  
Sensors And Actuators ◽  
Dynamic Forces ◽  
Active Vibration ◽  
The Ideal

This paper addresses the transmission of unwanted vibrations in flexible structures by actively minimizing dynamic forces seen at critical locations within the structure. An adaptive truss serves as an active interface between the two isolated sides of the structure, and force-feedback within individual links of the truss is the governing control law. The use of an adaptive truss allows the problem to be viewed as a set of localized control problems with collocated sensors and actuators. This paper first discusses the ideal capabilities of force feedback for active vibration isolation, and then presents the analytical and experimental results of a case study which shows significant reduction in transmitted vibrations.

scholarly journals THE COMPARISON OF READING COMPREHENSION IN DESCRIPTIVE TEXT INSTRUCTION USING CASE STUDY AND ANALYTICAL TEAM OF STUDENTS AT SENIOR HIGH SCHOOL OF STATE 1 KOTAGAJAH ACADEMIC YEAR 2012/2013

2013 ◽  
Vol 2 (2) ◽  
Author(s):  
Rosiana - ◽  
Eva - Faliyanti
Keyword(s):  
Reading Comprehension ◽  
Problem Formulation ◽  
Control Group ◽  
Significant Difference ◽  
Tenth Grade ◽  
Post Test ◽  
Text Instruction ◽  
And Control ◽  
Academic Year

Reading comprehension in descriptive text is the ability students of understanding and interpreting information in a descriptive text correctly or get meaning from written descriptive text based on some aspects. Many techniques presented as a solution in reading comprehension they are Case Study technique and Analytical Team technique. The problem formulation in this research are; (1) Is there any significant difference between using Case Study and Analytical Team toward students’ reading comprehension in descriptive text instruction for the tenth grade students of SMAN 1 Kotagajah (2) Which one is more effective between using Case Study and Analytical Team toward students’ reading comprehension in descriptive text instruction for the tenth grade students of SMAN 1 Kotagajah. The objectives of this research are (1) To know whether there is significant difference between using Case Study and Analytical Team toward students’ reading comprehension in descriptive text instruction for the tenth grade students of SMAN 1 Kotagajah. (2) To find out which one is more effective between using Case Study and Analytical Team toward students’ reading comprehension in descriptive text instruction for the tenth grade students of SMAN 1 Kotagajah.In this research, the researcher uses an experimental design. The kind of design is True Experimental Control Group Pre-test and Post test. Experimental group is taught Case Study and control group taught Analytical Team technique. The population in this research is 694 students. The sample in this research is class X which consists of 2 classes 44 students and each class consist of 22 students are as experimental class and 22 as control class. The writer use cluster stratified random sampling to takes sample. From the accounting of students score on post test, is was gained that at the significant level of 0,01, the tratio is higher than ttable, that is 2,77 for tratio and 2,70 for ttable.The conclusion are; (1) There is significant difference between using Case Study and Analytical Team toward students’ reading comprehension in descriptive text instruction for the tenth grade students of SMAN 1 Kotagajah. (2) Case Study is more effective than Analytical Team toward students’ reading comprehension in descriptive text instruction for the tenth grade students of SMAN 1 Kotagajah. It means that Case Study effective to develop students’ reading comprehension

SIMULATION AND CONTROL OF FLOODS IN A WATER NETWORK. CASE STUDY OF JIJIA RIVER CATCHMENT

2017 ◽  
Vol 16 (3) ◽  
pp. 587-595
Author(s):  
Vasile Mircea Cristea ◽  
Ph.m Thai Hoa ◽  
Mihai Mogos-Kirner ◽  
Csavdari Alexandra ◽  
Paul Serban Agachi
Keyword(s):  
Water Network ◽  
River Catchment ◽  
Simulation And Control ◽  
And Control

Case study: Simulation and control of high frequency noise for commercial vehicle cab considering leak

2019 ◽  
Vol 67 (4) ◽  
pp. 315-329
Author(s):  
Rongjiang Tang ◽  
Zhe Tong ◽  
Weiguang Zheng ◽  
Shenfang Li ◽  
Li Huang
Keyword(s):  
High Frequency ◽  
Commercial Vehicle ◽  
Frequency Noise ◽  
High Frequency Noise ◽  
Simulation And Control ◽  
And Control

The Influence of Wharfs on School Children: A Case Study of Portee Wharf in Freetown, Sierra Leone

2019 ◽  
Vol 2 (3) ◽  
pp. 128-140
Author(s):  
Alhaji Bakar Kamara
Keyword(s):  
West Africa ◽  
Sierra Leone ◽  
School Children ◽  
Research Area ◽  
Background Information ◽  
Control Problems

The focus of this research is to investigate the influence of wharfs on school children. Therefore it will report the findings of the result on the influences of wharfs on school children with specific case on Portee Wharf in Freetown, Sierra Leone in West Africa. In this regard, the introduction describes the research area, stating the statement of the problem, the overall goal and specific objectives that will be attained in this study, justification for selecting the topic, problems to be encountered during the course of carrying out this research and major influences. Besides, an indication of the methods used to investigate the topic will also be highlighted. Moreover, the studies will analyze the actual responses of the respondents of the activities of the wharf on school-going children. It will address the questionnaire in accordance with the following: Background information of respondents, this investigated areas such as sex, age, religion, occupation and tribe; It enquires about the activities of the wharfs, reasons and consequences of children engaged in wharfs and strategies to control problems that may emanate from the wharf. The paper will show the findings, gives the summary, conclusion and recommendations of problems identified while carrying out the research.

Obesity management through Ayurveda - A Case Study

2017 ◽  
Vol 2 (4) ◽  
Author(s):  
Dheeraj Kumar Tyagi ◽  
Shivakumar .
Keyword(s):  
Clinical Findings ◽  
Dietary Habit ◽  
Unhealthy Lifestyle ◽  
Lifestyle Management ◽  
Before And After ◽  
Effect Of Treatment ◽  
And Control

Lifestyle disorders are one of the biggest threats for the population living unhealthy lifestyle. Sthoulya (Obesity) is one such disorder which creates lot of physical as well as mental disorder to the sufferer. Due to changing lifestyle, comforts and dietary habit lots of individuals changed their life totally. Obesity is a growing disease in developed and developing countries. Prevalence is drastically hike in past few years. Ayurveda, the science of life with which we can manage and control lots of lifestyle disorders. Focusing on dietary and lifestyle management along with treatment, we can overcome the hazards of obesity which is growing in a uncontrolled manner. The available data is based on the clinical findings only. Aim and objective: To assess the effect of “Guru Cha Atarpanam Chikitsa” in the management of Sthoulya. Setting: Swastharakshana evam Yoga, OPD and IPD, SDMCAH, Hassan. Method: Udwarthana, Parisheka, Shamana Aushadhis, Ahara, and Vihara was followed within the treatment duration and effect of treatment was assessed before and after treatment, advised for follow up. Results: The treatment adopted is effective in the management of Sthoulya and to improve the quality of life.

A Problem in the Making: How Firms Formulate Sharable Problems for Open Innovation Contests

2018 ◽  
Author(s):  
Martin W. Wallin ◽  
Georg von Krogh ◽  
Jan Henrik Sieg
Keyword(s):  
Knowledge Creation ◽  
Open Innovation ◽  
Problem Formulation ◽  
Theoretical Framework ◽  
Monetary Reward ◽  
Technical Innovation ◽  
Prior Work ◽  
Exploratory Case Study ◽  
External Sources

Crowdsourcing in the form of innovation contests stimulates knowledge creation external to the firm by distributing technical, innovation-related problems to external solvers and by proposing a fixed monetary reward for solutions. While prior work demonstrates that innovation contests can generate solutions of value to the firm, little is known about how problems are formulated for such contests. We investigate problem formulation in a multiple exploratory case study of seven firms and inductively develop a theoretical framework that explains the mechanisms of formulating sharable problems for innovation contests. The chapter contributes to the literatures on crowdsourcing and open innovation by providing a rare account of the intra-organizational implications of engaging in innovation contests and by providing initial clues to problem formulation—a critical antecedent to firms’ ability to leverage external sources of innovation.

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