Analysis of Multiterm Queries in Partitioned Signature File Environments

The concern of this study is the signature files which are used for information storage and retrieval in both formatted and unformatted databases. The analysis combines the concerns of signature extraction and signature file organization which have usually been treated as separate issues. Both the uniform frequency and single term query assumptions are relaxed and a comprehensive analysis is presented for multiterm query environments where terms can be classified based on their query and database occurrence frequencies. The performance of three superimposed signature generation schemes is explored as they are applied to a dynamic signature file organization based on linear hashing: Linear Hashing with Superimposed Signatures (LHSS). First scheme (SM) allows all terms set the same number of bits regardless of their discriminatory power whereas the second and third methods (MMS and MMM) emphasize the terms with high query and low database ooccurrence frequencies. Of these three schemes, only MMM takes the probability distribution of the number of query terms into account in finding the optimal mapping strategy. The main contribution of the study is the derivation of the performance evaluation formulas which is provided together with the analysis of various experimental settings. Results indicate that MMM outperforms the other methods as the gap between the discriminatory power of the terms gets larger. The absolute value of the savings provided by MMM reaches a maximum for the high query weight case. However, the extra savings decline sharply for high weight and moderately for the low weight queries with the increase in database size. The applicability of the derivations to other partitioned signature organizations is discussed and a detailed analysis of Fixed Prefix Partitioning (FPP) is provided as an example. An approximate formula that is shown to estimate the performance of both FPP and LHSS within an acceptable margin of error is also modified to account for the multiterm case

Signature Files: An Integrated Access Method for Formatted and Unformatted Databases

The signature file approach is one of the most powerful information storage and retrieval techniques which is used for finding the data objects that are relevant to the user queries. The main idea of all signature based schemes is to reflect the essence of the data items into bit pattern (descriptors or signatures) and store them in a separate file which acts as a filter to eliminate the non aualifvine data items for an information reauest. It provides an integrated access method for both formattid and formatted databases. A complative overview and discussion of the proposed signatnre generation methods and the major signature file organization schemes are presented. Applications of the signature techniques to formatted and unformatted databases, single and multiterm query cases, serial and paratlei architecture. static and dynamic environments are provided with a special emphasis on the multimedia databases where the pioneering prototype systems using signatnres yield highly encouraging results

Analysis of Signature Generation Schemes for Multiterm Queries In Partitioned Signature File Environments

Our analysis explores the performance of three superimposed signature generation schemes as they are applied to a dynamic sigrtature file organization based on linear hashing: Linear Hashing with Superinzposed Signatures (LHSS). First scheme (SM) allows all terms set the same number of bits whereas the second and third methods (MMS and MMM) emphasize the terms with hlgh discriminatory power. In addition, M Mco nsiders the probaOiZity distribution of the number of query terms. The main contribution of the study is the combination of signature generation and signature file organization concepts together with the relaxation of the single term query and uniform frequency assumptions. The derivation of the performance evaluation formulas are provided as well as the analysis of various experimental settings. Results indicate that MMM outperforms the others as terms become more distinctive in their discriminatory power. MMM accomplishes the highest savings in retrieval eficiency for the high query weight case. We also discuss the applicability of the derivations to other partitioned signature organizations providing a detailed analysis of Fixed Prefix Partitioning (FPP) as an example. Finally, an appro.ximate perfortnance evaluation formula that works for both FPP and LHSS is modijied to account for the multiterm case

Dynamic Signature File Partitioning Based on Term Characteristics

Signature files act as a filter on retrieval to discard a large number of non-qualifying data items. Linear hashing with superimposed signatures (LHSS) provides an effective retrieval filter to process queries in dynamic databases. This study is an analysis of the effects of reflecting the term query and occurrence characteristics to signatures in LHSS. This approach relaxes the unrealistic uniform frequency assumption and lets the terms with high discriminatory power set more bits in signatures. The simulation experiments based on the derived formulas show that incorporating the term characteristics in LHSS improves retrieval efficiency. The paper also discusses the further benefits of this approach to alleviate the potential imbalance between the levels of efficiency and relevancy

Signature File Hashing Using Term Occurrence and Query Frequencies

Signature files act as a filter on retrieval to discard a large number of non-qualifying data items. Linear hashing with superimposed signatures (LHSS) provides an effective retrieval filter to process queries in dynamic databases. This study is an analysis of the effects of reflecting the term occurrence and query frequencies to signatures in LHSS. This approach relaxes the unrealistic uniform frequency assumption and lets the terms with high discriminatory power set more bits in signatures. The simulation experiments based on the derived formulas explore the amount of page savings with different occurrence and query frequency combinations at different hashing levels. The results show that the performance of LHSS improves with the hashing level and the larger is the difference between the term discriminatory power values of the terms, the higher is the retrieval efficiency. The paper also discusses the benefits of this approach to alleviate the imbalance between the levels of efficiency and relevancy in unrealistic uniform frequency assumption case

The Effect of Motor Performance on Sportive Performance of Children in Different Sports Branches

The aim of the study is to investigate the relationship between motor performances of children aged 10-14 years and ball striking speeds made by specific technique and to determine motor performance differences between the branches. A total of 64 children (football = 22, volleyball = 19, tennis = 23) aged 10-14 years participated in the study. The motor performances of the children participating in the study were determined with the Dordel Koch Test and the ball hitting velocities with the radar instrument. The Spearman correlation analysis was used to determine the relationship between ball hitting velocities and motor performance, and the Kruskal-Wallis test was used to determine the difference between the engine performances of the branches. According to the results obtained, there was a positive correlation between the DKTstanding long jump performance of the soccer players and the shooting speeds, between the volleyball players' DKTshuttle and DKTpush-up performances and the service speeds, between the DKTshuttle and DKTpush-up performances of the tennis players and service and forehand strokes p<0.01. It was determined that soccer players had higher performance than both tennis players and volleyball players in the DKTpush-up test, while football players in DKTbalance test had lower performance than both tennis players and volleyball players p <0.05. As a result, it has been found that motor performances differ according to the children’s branches. In addition, it is considered that the requirements of the sports branch (active use of the lower extremity, volleyball and upper extremity in the football) are effective on motor performance

The Investigation of the Relationship between Children’s 50m Freestyle Swimming Performances and Motor Performances

The aim of the study is to examine the relationship between children’s 50 m freestyle swimming performances and motor performances. There were 32 swimmers (male = 21, female = 11), who had been swimming for at least one and a half year, participated in the study. The motor performances of the participating swimmers were determined through the Dordel Koch Test (DKT) and 50 m swimming performances via the stopwatch. The Spearman Correlation Analysis was used to determine the relationship between children’s motor performances and the swimming performances of 50 m. As a result of the statistical analysis, it was determined that the performance categories of DKT sub-dimensions were DKTshuttle, DKTpush-up and DKTbalance performances of the categories in which both girls and boys were the best. It was determined that male swimmers would perform DKT6min running and female swimmers would have a positive effect on the 50 m freestyle swimming performance of DKTsideward jump performances (p <0.01, p <0.05). In addition, it was determined that all the swimmers had a positive effect on the 50 m freestyle swimming performances of the DKT sideward jump, DKT6min running and DKTflexibilty performance (p <0.01, p <0.05). As a result, it can be stated that DKT6min running, which is the demonstration of aerobic performance, increased DKTflexibility and DKTsideward jump performance will contribute to 50m swimming performance.. Moreover, it can be suggested that the performance development of the upper extremity (DKTshuttle and DKTpush-up), which is required for the branch in the performance, is categorized as performance

Neotectonics of Turkey (Türkiye) and surrounding regions: a new perspective with block modelling

This paper aims to present a new neotectonic perspective concordant with the seismic activities in Turkey and surrounding regions. The neotectonic structures have been re-evaluated mainly by using focal mechanism solutions and high-resolution satellite (Google Earth) images. The Southeast Anatolian Wedge explains thrust/blind thrust and asymmetrical folding relationship in SE Turkey, Syria, and Northern Iraq. The neotectonic structures of the Turkish-Iranian Plateau are enlightened by the rhomboidal cell model which creates a base to determine multiple intersection points between the region-wide left- and right-lateral shear zones. The releasing stepover between the North Anatolian Fault Zone and Southeast Anatolian-Zagros Fault Zone plus their connections with the Northeast Anatolian Fault Zone and the East Anatolian Fault Zone are described in a more meaningful way with the Anatolian Diagonal concept. It also clarifies the role of left-lateral shear zone in the west-southwest movement of Anatolian plate and its relationship with the Aegean and Cyprus arcs. A neotectonic region under the influence of NW-SE contraction is determined between the North Anatolian, Eskişehir, and Kırıkkale-Erbaa fault zones in which the Elmadağ-Eldivan and Abdüsselam pinched crustal wedges and the Beypazarı Blind Thrust Zone are developed. A new route for the southern branch of the North Anatolian Fault Zone is determined between Bolu and Değirmenlik (Milos) Island in the Aegean Sea via Mudurnu, Bursa, Balıkesir, and İzmir. All main neotectonic structures mentioned in this paper are evaluated by the elastic dislocation modelling and new neotectonic provinces are suggested

Retention of teeth in the fracture gaps of the mandible: a retrospective analysis.

OBJECTIVES Since the introduction of miniplate osteosynthesis and the use of prophylactic antibiotics, the complication rate related to the teeth in the fracture gap has significantly decreased. Currently, there are still no established guidelines for the management of such teeth in mandibular fracture lines. However, the long-term viability of these teeth within the fracture gap remains uncertain. Therefore, this study aimed to assess the survival rate of teeth located within the mandibular fracture line and evaluate related follow-up treatments over a minimum period of one year. MATERIALS AND METHODS This retrospective study examined 184 patients who underwent surgical treatment for mandibular fractures between January 2018 and December 2021. A total of 189 teeth located in the fracture line were analyzed. Clinical and radiological parameters were collected, including patient age and gender, fracture etiology and location, intraoperative tooth treatment, as well as complications related to both the fracture and the affected teeth in long term. RESULTS Most of the examined teeth remained uneventful, with postoperative tooth-related complications seen in 14 (7.4%) teeth. The most common complications were symptomatic apical periodontitis (n = 9, 4.8%) and increased tooth mobility (n = 3, 1.5%). A correlation was found between complications and trauma-related tooth luxation (p = 0.002, OR = 15.2), as well as prior teeth connected to retainers or orthodontic appliances (p = 0.001, OR = 10.32). CONCLUSION Tooth-related complications are rare when intact teeth are retained within the fracture gap. Therefore, unless there is a definitive intraoperative indication for extraction, it is recommended to preserve the teeth in the fracture line. CLINICAL RELEVANCE Intact teeth in the fracture line of the mandible should not be primarily extracted