Solve the Problem of Chess Board in the Shape of the Letter L with Three different Patterns Using Artificial Intelligence & Algorithms

In recent years, the chess game has begun to develop successful programming solutions. Computers were programmed to play chess in the middle of the twentieth century. Computer skills have become better and higher than the skills of chess players in the world, and from here this study has made it possible to find the optimal solution for the four square pieces in the form of a letter (L) without repetition and quick access to fill the sites and voids and to complete the entire area. It is our task to cover a (2n×2n) Chessboard with L-shaped tiles each tile is a (2×2) square with a (1×1) square removed from one corner. We are working to cover the Chessboard in such a way that there is a single 1×1 box left in the ‘corner’ of the Chessboard (by the 'corner' we mean one corner of the box should be uncovered). In this task, we will solve this problem with three approaches, the C programming approach, the second by dividing and conquering approach and the last by a greedy method approach. Three algorithms were used and a comparison was made between them, and the fastest method was achieved by a greedy method, with eight cases comparing one and four cases, respectively.

Mobility-related outcomes for periacetabular osteotomy in persons with acetabular dysplasia: setting the stage for measurement of real-world outcomes

ABSTRACT Periacetabular osteotomy (PAO) is a surgery for persons with symptomatic acetabular dysplasia (AD) that increases acetabular coverage of the femoral head for reducing hip pain and improving function. Patient-reported outcomes (PROs) are significantly improved following PAO, yet little is known regarding mobility-related outcomes. This narrative review provides a synthesis of evidence regarding PROs and mobility-related outcomes in persons with AD following PAO. We further identified important future research directions, chiefly the need for measurement of real-world outcomes. We searched PubMed using comprehensive predefined search terms. We included studies that (i) enrolled persons with AD undergoing PAO, (ii) included PROs and/or mobility-related outcomes and (iii) were written in English. We synthesized and summarized study characteristics and findings. Twenty-three studies were included in this review. Commonly evaluated PROs included pain (n = 14), hip function (n = 19) and quality of life (n = 9). Mobility-related outcomes included self-reported physical activity (PA; n = 11), walking speed and cadence (n = 4), device-measured PA (n = 2), and sit-to-stand, four-square-step and timed stair ascent tests (n = 1). Persons with AD had significant improvements in PROs following PAO, yet mobility-related outcomes (e.g. walking speed and device-measured PA levels) did not change over 1 year following PAO. Few studies have evaluated mobility-related outcomes following PAO, and these studies were of a low methodological quality. Future research might include experience sampling data collection approaches and body-worn devices as free-living, technology-driven methodologies to evaluate mobility and other outcomes in persons with AD undergoing PAO.

Improving functional text writing achievement by using Four Square Strategy at SMK Negeri 2 sekayu

The fact that English writing skill in Indonesia is still low encouraged the writer to conduct this study concerning vocational high school students. Four Square strategies in prewriting activities help students to write, especially in writing functional text. The objective of this study was to see if there was a substantial difference in writing achievement between students who were taught with the Four Square strategy and those who were not. The quasi-experimental approach was applied in this research. The population of SMK Negeri 2 Sekayu’s eleventh graders in the academic year 2021/2022, with a total of 217 students. From this group, 60 students were chosen as the sample and divided evenly into two groups, the experimental and control groups. The Four Square strategy was used to teach the experimental group, whereas the control group received no treatment. However, all the students in the two groups were given writing tests before and after the application of the two strategies. A t-test was used to assess the data collected. The result showed that the experimental group outperformed the control group with a significant mean difference of 23.82 (p < 0.00). These results indicated that the Four Square strategy was effective in improving the students’ writing achievement.

The Use of Four-Square Technique to Improve Students’ Writing Ability

This research was quasi-experimental research that aimed to find out the extent of the improvement students' writing ability by using the Four Square Technique on the descriptive text at students X SMAN 3 Takalar. the researcher took 53 samples, 28 students as the experimental group and 25 students as the control group. The research data was obtained by giving a pre-test and post-test and analyzed by using the Dependent Sample T- Test. The result of the data showed that students' writing ability improved. It was proved from score result of tobs (16,673) which was higher than ttable (2.052) and sig. P (0.05) was higher than sig.score (0.000). Students' writing ability improve by 0.1% after using the Four Square Technique from pre-test mean score was 65.07 and the post-test mean score was 75.14. So, it can be concluded that using Four Square Technique can improve students' writing ability in writing a descriptive text at students X SMAN 3 Takalar. By using it, students showed that they can be motivated in writing, students more easily generate and organize their ideas into a text so that students’ writing was more organized also easy to understand.

Experimental and Finite Element Study of Polymer Infilled Tube-in-Tube Buckling Restrained Brace

This study presents a tube-in-tube buckling-restrained brace (BRB) infilled with lightweight and rapid hardening polymer. The proposed BRB consists of a circular or square tube core encased with a tube of similar shape and polymer infill. The tube-in-tube arrangement minimizes the filler material volume and enables the use of rolled steel section as opposed to welded profiles commonly utilized when large BRB axial strength is required, although welded profiles suffer from low assembly accuracy resulting from welding deformation. The infilled polymer has a density of approximately half that of mortar and requires a curing time of 24 h, enabling weight and fabrication time reduction. The stability and inelastic deformation capability of the BRB were investigated through brace and subassembly tests of six circular and four-square full-scale specimens, followed by finite element analysis. The test results show that circular BRB designed with a Pcr/Py ratio of 1.46 exhibited a stable hysteresis up to 1.42% and 1.06% core strain in tension and compression, respectively. Circular and square specimens designed with Pcr/Py ratios ranging from 0.82 to 1.06 exhibited stable hysteresis before failing by global buckling at compressive core stains ranging from 0.86% to 1.09%. The slot weld detail adopted for welding core projection stiffener displayed a stable performance in circular BRB specimens, while it resulted in large plastic strain demand in square BRB specimens, leading to core fracture at tensile core strains ranging from 0.64% to 0.71%.

Numerical Investigation of Fluid Flow past Four Cylinders at Low Reynolds Numbers

A numerical investigation on the effects of separation ratios and Reynolds numbers on the flow around four square cylinders in diamond arrangement has been carried out using the lattice Boltzmann method. The separation ratios between the cylinders vary from g ∗ = 1 to 15. The Reynolds numbers based on the diameter of the square cylinder and the inlet uniform inflow velocity are selected from Re = 80 to 160. The computations show that a total of five different flow regimes are observed over the selected ranges: single bluff-body, quasi-unsteady, chaotic flow, in-phase synchronized vortex shedding, and antiphase synchronized vortex shedding flow regimes. It is found that the flow features significantly depend on both the separation ratio and Reynolds number, with the former’s influence being more than the latter’s. We found that the critical spacing for four square cylinders in diamond arrangement for selected Reynolds numbers (80 ≤ Re ≤ 160) is in the range of 2 ≤ g ∗ ≤ 5. The results reveal that the presence of secondary cylinder interaction frequencies indicates that, for chaotic flow regime, the wake pattern is not stable and there is a strong interaction of gap flows and continuous change in the direction of shed vortices behind the cylinders. The effects of the g ∗ and Re on fluid forces, vortex shedding frequency, and flow separation have been examined in detail.

Predicting Falls in Healthy Elderly: A Comparison between Unified Balance Scale versus Four-Square Step Test

Background: Falls is a major incidence in elderly life and its sequence may be a major cause of mortality. Falls can be predicted and thus prevented. Screening scales are either a brief one component balance or more composite multifactorial assessment. Four Square Step test is an easy, less time consuming, versus Unified Balance scale which is multi domain. The present study was intended to see which of the two scales could accurately predict adults who were at risk of falls. Thus, helping therapist perform a single test to screen them and give them targeted treatment. Method: 80 Healthy elderly above the age of 60 years were included in the study. Fall history was noted post which Four Square Step test and Unified Balance Scale was administered in sequence. Data Analysis was done, and sensitivities and specificities were calculated. Result: Statistical Analysis was done by plotting the contingency table and plotting the Receiver Operating Curve. The Unified Balance Scale had a better combination of sensitivity and specificity than Four Square step test. Conclusion: Unified Balance scale is better than Four-Square step test in predicting falls in healthy elderly. Key words: Elderly, Fall-Risk, Screening, Four Square Step Test, Unified Balance Scale, Prediction.