Start Problem Research Articles

Implementation of solar cell booster to prevent damage to the electrical system and overcome CA N'T-Start Problems on PC2000-8 Units at PT PPA Jobsite Borneo Indobara

One of the critical problems that disrupted production achievement at the Putra Perkasa Abadi (PPA) Jobsite Borneo Indobara (BIB) mine was the breakdown of the unscheduled electrical system engine can't start on the PC2000-8 unit due to low battery voltage. The problem is behind the modification or improvement in the battery charging system of the PC2000-8 unit by adding components in the form of solar cells that function as backup supplies of electrical energy or battery boosters on the main battery of the unit. In this study, there is a novelty term, namely "One Way Charge" which means that if the voltage of the unit's main battery is less than the stadium (PC2000-8 engine start voltage drop limit: 22 Volts), automatically electrical energy from the solar cell battery booster will be channeled to the unit's main battery to help meet voltage needs. The implementation shows that these improvements effectively reduce and prevent the frequency and downtime of unscheduled electrical system engine breakdowns that can't start on PC2000-8. Another benefit of this improvement is that it can eliminate potential lost costs both in terms of production and rental rates due to these problems and support the achievement of the Sustainable Development Goals (SDGs) of Clean and Affordable Energy through the use of renewable energy.

Dynamic Controllability of Processes without Surprises

Dynamic controllability guarantees that a process control can steer the execution of a business process without violating any temporal constraints although some tasks have uncontrollable durations. However, it has been shown that dynamic controllability may lead to process executions with the undesirable property that tasks have to be started or ended on extremely short notice. Sudden termination forces the agent to immediately terminate the execution of a process task without any prior notice in order to meet some temporal constraints. Semi-dynamic controllability guarantees dynamic controllability and the absence of sudden termination. Here, we show that dynamic controllability may also lead to the problem of sudden start, which forces the immediate start of a process task without prior notice. We formalize all constellations of temporal constraints causing sudden start and sudden termination in a process. We propose a technique to design processes in which activities can be dynamically dispatched without these surprises, i.e., with advance notice, and extend the notion of semi-dynamic controllability by also considering the sudden start. This leads to a sound and complete algorithm for checking the semi-dynamic controllability of time-constrained processes.

Multi-Batch Quasi-Newton Method with Artificial Neural Network for Movie Recommendation

The recommendation methods are required in the e-commerce website to help users in the decision-making process. Social Network has a high influence on the movie-based opinions among the users and social network data can be applied in recommendation system to handle the cold start and data sparsity problem. Existing research has the limitation of the overfitting problem in the model and also has lower efficiency in cold start and data sparsity problem. In this study, a Multi-Batch Quasi-Newton (MBQN) and Limited Memory Broyden–Fletcher–Goldfarb–Shanno (L-BFGS) gradient methods are implemented to solve these issues of the recommendation system. To solve the cold start and data sparsity issues, the MBQN method overlaps the consecutive sample. The L-BFGS gradient method is used for the parameter estimation in the machine learning technique and the MBQN method is used to select the subset of the training data. The different data points are used to evaluate the function and gradient at the start and end of the iteration. The proposed MBQN is evaluated using the artificial neural network (ANN). The nonnegative factorization method is applied to the data to reduce the overfitting issue in the ANN. The proposed MBQN method is evaluated using MovieLens datasets to analyze the performance of the recommendation system. The k-fold cross-validation is applied to evaluate the performance of the proposed MBQN with nonnegative matrix factorization. To analyze the robustness of the method, a large dataset is known as MovieLens 25 M dataset was applied to evaluate the performance. The experimental results show that the MBQN has a higher performance in the movie recommendation compared to the existing matrix factorization method. In addition to this, the results reveal that the MBQN method attains the ratio value of RMSE as 0.973 and the existing method attains the ratio value of RMSE as 2.776.

Implicit Preferences Discovery for Biography Recommender System Using Twitter

With the dawn of the information age, the number of choices that each person has to make each day has seen an explosive growth. Every minute, users are bombarded with so many different options for everything user do, from buying clothes to watching TV, that one live in a state of constant information overload, feeling stressed out by this imposed free will then be liberated by it. One ways in which user have now become used to mitigating this constant barrage of incessant information is by the usage of Recommender Systems. These systems are software components that use some form of rating provided by a user to generate recommendations for items that they may be interested in. Unfortunately, recommender systems face a major problem called the “Cold – Start problem”, which essentially means that a recommender system in an online setting has no information about the user when the user first signs up. Many approaches have been proposed to solve this, but the one this paper shall be taking is to use information from social networks, specifically Twitter, to get this initial information. Implicitly infer user interest with good accuracy is proposed here and this understanding of interests can later be updated by observing user actions as they interact with the system. We leverage the power of the categorical information stored in the Wikipedia database to allow us to assign relative weights to entities that a user follows on Twitter. This proposed approach for creating the rating vector for each user by mining the Twitter account of the users’ is evaluated using the RMSE and MAE metrics.

PAL-Hom method for QP and an application to LP

In this paper, a proximal augmented Lagrangian homotopy (PAL-Hom) method for solving convex quadratic programming problems is proposed. This method takes the proximal augmented Lagrangian method as the outer iteration. To solve the proximal augmented Lagrangian subproblems, a homotopy method is presented as the inner iteration. The homotopy method tracks the piecewise-linear solution path of a parametric quadratic programming problem whose start problem takes an approximate solution as its solution and the target problem is the subproblem to be solved. To improve the performance of the homotopy method, the accelerated proximal gradient method is used to obtain a fairly good approximate solution that implies a good prediction of the optimal active set. Moreover, a sorting technique for the Cholesky factor update as well as an $$\varepsilon $$ -relaxation technique for checking primal-dual feasibility and correcting the active sets are presented to improve the efficiency and robustness of the homotopy method. Simultaneously, a proximal-point-based AL-Hom method which is shown to converge in finite number of steps, is applied to linear programming. Numerical experiments on randomly generated problems and the problems from the CUTEr and Netlib test collections, support vector machines (SVMs) and contact problems of elasticity demonstrate that PAL-Hom is faster than the active-set methods and the parametric active set methods and is competitive to the interior-point methods and the specialized algorithms designed for specific models (e.g., sequential minimal optimization method for SVMs).

ІНФОРМАЦІЙНА СКЛАДОВА ПУБЛІЧНОЇ БЕЗПЕКИ В УМОВАХ ГІБРИДНОЇ ВІЙНИ

The aim of the article is to research the essence of the leading scientific approaches and foreign practices into the public security; to identify informational component of public security under the conditions of hybrid warfare. Despite significant number of publications devoted to the problems of informational security and start of counterpropaganda in Ukrainian Mass Media, the external media surrounding is still not capable yet to resist adequately Russian informational aggression. Ukrainian media policy demands substantial modernization in offensiveness, usage of new technical and manipulative capabilities. Authors analysed European model of people power and proposed the ways of its adaptation of Ukrainian reality though the actualization of those definitions, as national and public security, fundamental national interests. Also, authors made research of the modern social-political situation in Ukraine and developed proposals for improving state informational policy based on Crimea example. In addition, the actual tasks of the state policy are developed for the challenges based on hybrid warfare. The practical aim of the publication is to develop and implement scientifically justified conceptual approaches to counteract the Russification of the Ukrainian population in the conditions of Crimea annexation and armed conflict in the East of Ukraine. Based on the analysis of the situation with freedom of speech and mass media in the occupied Crimea, authors submitted proposals on strengthening the Ukrainian information presence on the peninsula; the basic principles of development and implementation of the National concept of information policy in the Autonomous Republic of Crimea and Sevastopol are substantiated. Negative trends that already exist in the domestic media space are highlighted and ways to minimize them are proposed. Special attention was paid to the need for a coordinated large-scale and daily information campaign on Crimea.

Strategies to Introduce n-Butanol in Gasoline Blends

The use of oxygenated fuels in spark ignition engines (SIEs) has gained increasing attention in the last few years, especially when coming from renewable sources, due to the shortage of fossil fuels and global warming concern. Currently, the main substitute of gasoline is ethanol, which helps to reduce CO and HC emissions but presents a series of drawbacks such as a low heating value and a high hygroscopic tendency, which cause higher fuel consumption and corrosion problems, respectively. This paper shows the most relevant properties when replacing ethanol by renewable n-butanol, which presents a higher heating value and a lower hygroscopic tendency compared to the former. The test matrix carried out for this experimental study includes, on the one hand, ethanol substitution by n-butanol in commercial blends and, on the other hand, either ethanol or gasoline substitution by n-butanol in E85 blends (85% ethanol-15% gasoline by volume). The results show that the substitution of n-butanol by ethanol presents a series of benefits such as a higher heating value and a greater interchangeability with gasoline compared to ethanol, which makes n-butanol a promising fuel for SIEs in commercial blends. However, the use of n-butanol in E85 blends substituting either gasoline or ethanol may cause cold-start problems due to the lower vapor pressure of n-butanol. For this reason, a combined substitution of n-butanol by both gasoline and ethanol is proposed so that n-butanol can be used without start problems.

De la anomalía a lo extraordinario: nobleza, linaje y escritura genealógica en Castilla (siglos XIII-XIV)

Starting from the problem of the late start of Castilian genealogical literature compared to other European contexts, this article discusses the relevance of the use of certain historiographic categories, with a strong emphasis on that of «lineage», to account for one of the basic forms of sociability in the nobility of the late Middle Ages. The article echoes the main theoretical discussions in the field, relating them to the issues of orality and the written word. Finally, certain lines of research are proposed, such as the analysis of the concept of lineage in Castilian and other Peninsular sources; how Alfonso X of Castile attempted to capitalize on it politically and socially; or how lineage is conceived of in the texts produced by the Castilian nobility and its milieu in the late Middle Ages

Application of Programmable Pre-Emphasis in LVDS Driver

As demand for data rate continues to increase, new problem of LVDS start to come out, such as signal integrity. Those problems are primarily caused by frequency-dependent loss in transmission line. The purpose of pre-emphasis is to apply intentional overdriving to the signal and get it back to the original signal with the proper weight, thereby compensating for the ISI from the nearby data symbol. In order to avoid over-emphasis we propose a programmable pre-emphasis adapting to different situation, and finish the prototype which can improve the transmission bandwidth more effectively, achieving high-speed data transmission.

The Application of Speeder Based on Frequency Conversion and Fluid Viscous Soft Start in Port

The start and speed control problems of motor were analyzed in port machinery, the advantages of frequency conversion and fluid viscous start were synthesized, the speeder based on frequency conversion and fluid viscous soft start was designed. The start of motor can be protected by fluid viscous soft start, especially in the stationary start under the load. The motor can be realized infinite speed control by frequency conversion device, the use safety of motor is protected and the work efficiency is enhanced, then the aim of energy saving is realized.

MALPRAKTIK DOKTER DALAM PERSPEKTIF HUKUM

Now adays malpractice problem of health service start to talk lively by the various society. That matter is seen from many indictment cases of malpractice which submitted by the society about a doctor profession that regarded to have inflicted the patient in conducting a task which are cause the wrong act, feel pain, injury, physical defect, body damage, and death. A law justification of doctor malpractice which is cause the inflicted of patient, so the victim side could be demand for materil and immateril compensation. The law protection of doctor malpractice’s victim who is demand to the court, a judges could apply a Res Ipsa Loquitur doctrine, its means that the victim sides does not need to prove the presence of carelessness substances, but they enough to show the truth.Keyword: Malpractice, Res Ipsa Loquitur

Operation Phoenix

THE PROBLEM OF WHERE TO START THE MULTI‐DIMENSIONAL NATURE OF THE SUBJECT OPERATION PHOENIX is about living and working in a technological society. It bears this title because it started off, about five years ago, as a study of what Britain has to do to achieve national regeneration. My method of working included two main activities: first, monitoring the mass of information published world‐wide on the subject of living and working in a technological society; and, secondly, isolating certain trends and streams of thought by this process and then exposing them to criticism and analysis in a series of seminars, both in‐plant and public, so as to get some reaction to these ideas. My purpose was not only to make discoveries but also to communicate them at the same time as a means of further refining them.

Some Developments in Boundary Layer Research in the Past Thirty Years

SummaryBoundary layer theory is the cornerstone of our knowledge of the flow of air and other fluids of small viscosity under circumstances of interest in many engineering applications, especially also in aeronautics. Many complex problems in aerodynamics, as for instance the problem of skin friction, which was theoretically attacked very early by F. W. Lanchester, have been clarified by studying the flow within the boundary layer and its effects on the general flow around the body.Research work on boundary layers, as started by Prandtl in 1904. was for the first twenty years—up to Prandtl's Wilbur Wright Memorial Lecture to the Royal Aeronautical Society in 1927—almost entirely restricted to Prandtl's Institute at Göttingen. But since about 1930 boundary layer theory has been generally accepted, and in the past thirty years there has been an almost exponential rise of the number of contributors to its further development.The author tries to trace certain lines, along which this important branch of modern fluid dynamics has developed in the past thirty years. In this connection the following topics are treated to some extent:I.Transition from laminar to turbulent flow.II.Boundary layer control for high lift and low drag of aerofoils.III.Aerodynamic heating at high speed (high Mach numbers).IV.Boundary layer efff cts on swept wings and on rotating bodies.I. The theoretical investigations of the problem of transition start from Reynolds' and Lord Rayleigh's hypothesis of the instability of laminar flow. After many unsuccessful attempts Tollmien, 1930, finally succeeded in calculating the critical Reynolds number for the boundary layer on a flat plate. More than ten years later Tollmien's stability theory was completely confirmed by very careful experiments of Dryden and his co-workers.II. After many wind tunnel experiments the investigations of boundary layer control for high lift of aerofoils led to the construction of two aeroplanes with boundary layer suction at the aerodynamische versuchsanstalt gottingen, in 1938, which were quite successful. later on, also, a considerable reduction of the skin friction of aerofoils was obtained with the advent of the laminar flow aerofoil.III. In flow at high Mach numbers the velocity boundary layer is accompanied by a thermal boundary layer which is caused by frictional heating. The large increase in the temperature of a solid surface in a high speed stream which can be calculated from boundary layer theory only, poses a serious problem to aeronautical engineers (“thermal barrier”).IV. The aerodynamic characteristics of swept wings and Delta wings are largely governed by the behaviour of their boundary layer. Some of the draw-backs of such wing plan forms can be remedied by boundary layer control, as for instance by a “boundary layer fence.” For turbo-machines the influence of the centrifugal forces on the boundary layer plays an important role for their aerodynamic coefficients.