The goal of concurrency control is to guarantee the correct interleaving of the operations. ROLL (Request Order Linked List) is a concurrency control method which can avoid transaction abort and minimize transaction restart. In its basic form, it requires predeclaration before a transaction is scheduled, similar to other conservative concurrency control methods, including conservative 2PL (2-Ph...

The theoretical probability of misclassification in a mastery test is exactly computed using the raw score probability distribution (in the Rasch model) as a function of the examinee's latent ability. The resulting misclassification probability curve, together with the latent ability distribution in the group of examinees, completely determines the expected rate of classification errors. It is ...

Spelling correction is an important component of any system for processing text. Agglutinative languages such as Turkish or Finnish, differ from languages like English in the way lexical forms are generated. Typical nominal or a verbal root may generate thousands (or even millions) of valid forms which never appear in the dictionary. For instance, we can give the following (rather exaggerated) ...

The purpose of this ITEMS module is to provide an introduction to Markov chain Monte Carlo (MCMC) estimation for item response models. A brief description of Bayesian inference is followed by an overview of the various facets of MCMC algorithms, including discussion of prior specification, sampling procedures, and methods for evaluating chain convergence. Model comparison and fit issues in the ...

We studied the presenting clinical and biologic features of 23 children with acute lymphoblastic leukemia (ALL) whose leukemic marrow karyotypes contained abnormalities involving the short arm of chromosome 12. Nineteen of the abnormalities were assigned to the 1 2pl 2 breakpoint. The median age of the children was 5 years (range 2 to 13 years) and their initial leukocyte counts ranged from 1,8...

The purpose of this ITEMS module is to provide an introduction to Markov chain Monte Carlo (MCMC) estimation for item response models. A brief description of Bayesian inference is followed by an overview of the various facets of MCMC algorithms, including discussion of prior specification, sampling procedures, and methods for evaluating chain convergence. Model comparison and fit issues in the ...

The use of service-oriented technologies has been used increasingly to speed up the application process and respond to changing business needs for many e-commerce systems. However, current e-commerce transaction services are poor at processing data access conflicts in a timely manner. The different timely data access for e-commerce applications should be considered with concurrency control mech...

Penelitian ini bertujuan menyelidiki kesetaraan skor try out UN mata pelajaran matematika SMP tahun 2014 Kota Makassar yang terdiri dari 2 paket soal yakni 1 direspons 2099 siswa dan 2068 siswa. Rancangan penyetaraan digunakan adalah dengan butir bersama. Analisis analisis menggunakan pendekatan IRT membandingkan seluruh metode mean-mean, mean-sigma, Haebara, Stocking-Lord model 1PL, 2PL, 3PL. ...

Modern systems with large main memories and massively parallel processors have inspired many new high-performance OLTP systems [2–4,6], often referred to as main memory DBMS (MMDBMS). These systems leverage spacious main memory to fit the whole working set in DRAM with streamlined, memory-friendly data structures; further, optimizations for multicore and multi-socket hardware allow a much highe...

DOCUMENT RESUME TM 028 873 Glas, Cees A. W.; Meijer, Rob R.; van Krimpen-Stoop, Edith M. L. A. Statistical Tests for Person Misfit in Computerized Adaptive Testing. Research Report 98-01. Twente Univ., Enschede (Netherlands). Faculty of Educational Science and Technology. 1998-00-00 28p. Faculty of Educational Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Net...