bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development and Modeling of Decision Tree for Survival Data with Multiple Events Using Deviance and Cox-Snell Residuals within Node Homogeneity Technique
Authors: Dauda Kazeem 
Published: June 2022

It is very common in medical studies for a patient to experience more than one event rather than one of interest. This led to exposing an individual to multiple risks and medical practitioners need to account for these risks concerning some prognostic factors. There are many methods of dealing with multiple events in survival data classically, however, these methods break down when considering the top-down effect of the prognostic factors concurrently and when the risks of events are correlated (competing risks). This study aimed to develop a decision tree using a within-node homogeneity procedure in survival analysis with multiple events to classify individual risks for the competing risks. Since the CART methodology involves recursive portioning of covariates into different subgroups, this study considers the use of Deviance and Modified Cox-Snell residuals as a measure of impurity in the Classification Regression Tree (CART) during the process of partitioning. The flexibility and predictive accuracy of our learning algorithm would then be compared with other existing methods through simulation and the freely available online real-life data. The results of the simulation revealed that: using Deviance and Cox-Snell residuals as a response within the node homogeneity classification tree performs better than using other residuals irrespective of performance indices. Results from empirical studies of the two real-life data that the proposed model with Cox-Snell residual (Deviance=16.6498) performs better than both the Martingale residual (deviance=160.3592) and Deviance residual (Deviance=556.8822). Conclusively, using Cox-Snell residual (Mean Square Error (MSE)=0.01783563) as a measure of impurity in CART revealed improved performance than using any other residual methods (MSE=0.1853148, 0.8043366). This implies that the proposed methods have the capability of accounting for individual effects based on the prognostic biomarkers.
Analisis Ketercapaian Indikator Habits of Mind (HoM) Siswa SMA
Authors: Hutajulu Mastha , Wahyudin Wahyudin 
Published: June 2022

This study aims to analyze the achievement of each indicators habits of mind (HoM) senior high school students. The research method used is descriptive. The population in this study were high school students in the city of Bandung. The sample was chosen by 1 class consisting of 31 students. The instrument used was the Habits of Mind questionnaire. The results showed that the habits of mind of senior high school students were positive for the 12 indicators (75 %) and negatif for 4 indicators (25 %). This study can be recommended to improve the habits of mind (HoM) senior high school students.
ANALISIS KEMAMPUAN KONEKSI MATEMATIS SISWA KELAS VIII DITINJAU DARI GAYA KOGNITIF REFLEKTIF-IMPULSIF
Authors: Febrianti Habel Ine , Susilowaty Nora 
Published: June 2022

Kemampuan koneksi matematis merupakan salah satu kemampuan matematis yang sangat penting bagi siswa. Kemampuan koneksi matematis dapat dipengaruhi oleh gaya kognitif. Salah satu gaya kognitif ditinjau dari konseptual tempo yaitu gaya kognitif reflektif dan gaya kognitif impulsif. Tujuan penelitian ini adalah untuk mengetahui : 1) gaya kognitif yang paling dominan pada tingkat kemampuan koneksi matematis rendah, sedang, dan tinggi serta 2) menganalisis dan mendeskripsikan kemampuan koneksi matematika siswa ditinjau dari gaya kognitif reflektif dan impulsif. Jenis penelitian ini adalah deskriptif dengan menggunakan pendekatan kualitatif. Subjek dalam penelitian ini adalah 6 orang siswa dari kelas VIII SMP Advent Parongpong dan kelas VIII SMP Advent II Setiabudi dipilih berdasarkan gaya kognitif reflektif dan gaya kognitif impulsif. Metode pengumpulan data berupa tes tertulis dan wawancara. Hasil penelitian menunjukkan gaya kognitif yang paling dominan untuk kategori rendah adalah gaya kognitif impulsif sedangkan siswa dengan gaya kognitif reflektif paling dominan untuk kategori sedang dan tinggi. Siswa reflektif dengan kemampuan koneksi matematis tinggi mampu mencapai seluruh indikator kemampuan koneksi matematis. Siswa reflektif dengan kemampuan koneksi matematis sedang dan rendah kurang mampu memenuhi seluruh Indikator kemampuan koneksi matematis. Siswa impulsif dengan kemampuan koneksi matematis tinggi, sedang dan rendah kurang mampu memenuhi memenuhi seluruh Indikator kemampuan koneksi matematis.
Analisis Pengaruh Daya Tarik Iklan, Kualitas Informasi, Kemudahaan dan Kepercayaan Terhadap Keputusan Pembelian Marketplace Shopee
Authors: Yolandita Cintia , Nursanta Edy , Widiyarsih Widiyarsih , Masitoh Siti 
Published: June 2022

Pesatnya pertumbuhan pengguna internet telah memberikan peluang bagi kebangkitan bisnis e-commerce. Banyak para pelaku bisnis yang memanfaatkan peluang untuk menjual produk secara online tanpa batasan jarak dan waktu. Pada masa wabah ini banyak orang yang melakukan transaksi online melalui pasar untuk memenuhi kebutuhannya. Tujuan dari penelitian ini adalah untuk menganalisis, pengaruh daya tarik iklan, kualitas informasi, kenyamanan, dan kepercayaan terhadap keputusan pembelian. Pada saat yang sama, pengaruh daya tarik iklan, kualitas informasi, kenyamanan, dan kepercayaan terhadap keputusan pembelian dianalisis. Mengidentifikasi variabel mana yang mendominasi keputusan pembelian. Metode analisis penelitian ini menggunakan data mentah kuantitatif, dan tahapan pengujiannya adalah validitas, reliabilitas, normalitas, multikolinearitas, heteroskedastisitas, analisis regresi linier berganda, koefisien determinasi, uji-t dan uji-F yang digunakan dalam penelitian ini. Alat survei kuesioner, dan 100 responden mengumpulkan data yang valid. Metode pengambilan sampel yang digunakan dalam penelitian ini adalah purposive sampling. Alat pengujian yang digunakan adalah SPSS Ver. 25.0. Hasil penelitian menunjukkan bahwa variabel daya tarik iklan tidak berpengaruh signifikan terhadap keputusan pembelian, variabel kualitas informasi berpengaruh signifikan terhadap keputusan pembelian, variabel kenyamanan tidak berpengaruh signifikan terhadap keputusan pembelian, dan variabel kepercayaan berpengaruh signifikan. pada keputusan pembelian. Sebagian mempengaruhi keputusan pembelian. Daya tarik iklan, kualitas informasi, kenyamanan, dan kepercayaan semuanya secara bersamaan memiliki dampak signifikan terhadap keputusan pembelian. Variabel yang paling penting dalam keputusan pembelian adalah variabel kepercayaan.
DEFORMATIONS AND NATURAL FREQUENCY SPECTRUM OF A PLANAR REGULAR TRUSS WITH A TRIANGULAR LATTICE
Authors: Кирсанов М. Н. 
Published: June 2022

Формула зависимости прогиба статически определимой фермы рамного типа от числа панелей выводится методом индукции в системе компьютерной математики Maple. Рассмотрена равномерная и сосредоточенная нагрузка на верхний пояс. Приведена картина распределения усилий по стержням фермы. Методом Донкерлея найдена аналитическая оценка снизу первой частоты колебаний в предположении, что масса фермы равномерно распределена по узлам. Обобщение решения на произвольное число панелей производится методом индукции. Решение сравнивается с численным решением для всего спектра частот, найденного при помощи оператора решения задачи о собственных числах Eigenvalues системы Maple. Отмечается высокая точность полученной оценки, растущая с увеличением числа панелей. В множестве спектров регулярных ферм различного порядка обнаружены спектральные изолинии и спектральные константы. Погрешность аналитической оценки, представляющей формулу с коэффициентами в виде полиномов по числу панелей не выше шестого порядка, не превышает 24%. При числе панелей больше восьми погрешность оценки меньше 5%.
The formula for the dependence of the deflection of a statically determined frame-type truss on the number of panels is derived by induction in the Maple computer mathematics system. A uniform and concentrated load on the upper belt is considered. A picture of the distribution of forces on the truss rods is given. The Dunkerley method is used to find a lower analytical estimate of the first oscillation frequency under the assumption that the truss mass is uniformly distributed over the nodes. Generalization of the solution to an arbitrary number of panels is carried out by induction. The solution is compared with the numerical solution for the entire frequency spectrum found using the Maple eigenvalues operator. The high accuracy of the obtained estimate is noted, which grows with the increase in the number of panels. In the set of spectra of regular trusses of various orders, spectral isolines and spectral constants are found. The error of the analytical estimate, which is a formula with coefficients in the form of polynomials in the number of panels not higher than the sixth order, does not exceed 24%. When the number of panels is more than eight, the estimation error is less than 5%.
RELIABILITY OF THE ROOF TRUSS FROM THIN-WALL PROFILES "MOLODECHNO"
Authors: Сафронов В. С. , Ун П. 
Published: June 2022

Описываются методика и алгоритм расчета параметров надежности стальной стропильной фермы из тонкостенных замкнутых профилей типа «Молодечно» с учетом разброса прочностных характеристик материалов, действующих нагрузок, размеров конструкции. Приводятся результаты численных исследований зависимостей логарифмических показателей надежности фермы от совместного действия постоянных и временных нагрузок для двух вариантов расчетной схемы конструкции с учетом и без учета изгибной жесткости элементов.
The method and algorithm for calculating the reliability parameters of a steel truss truss from thin-walled closed profiles of the Molodechno type are described, taking into account the spread in the strength characteristics of materials, acting loads, and dimensions of the structure. The results of numerical studies of the dependencies of the logarithmic indicators of the truss reliability on the combined action of permanent and temporary loads are presented for two variants of the design scheme of the structure with and without taking into account the bending stiffness of the elements.
APPROBATION OF THE DEVELOPED METHODOLOGY OF FULL-SCALE MEASUREMENTS OF THE STRESS-STRAIN STATE OF THE SPAN UNDER INCREASED EXPOSURE TO SOLAR RADIATION
Authors: Гриднев С. Ю. , Подлесных И. С. 
Published: June 2022

Статья посвящена апробированию ранее разработанной авторами методики температурного воздействия от влияния солнечной радиации на напряженно-деформированное состояние (НДС) пролетного строения с ортотропной плитой. Проведены инструментальные измерения прогибов главных балок в жаркое время года. С помощью конечно-элементного комплекса исследовано НДС несущих элементов пролетного строения для каждого случая воздействия солнечной радиации с учетом инструментально измеренных температур. Определены границы удовлетворительного совпадения результатов расчетов, полученных на основании инструментальных измерений прогибов и деформаций главных балок пролетного строения при воздействии солнечной радиации и расчета в программе метода конечных элементов.
The article is devoted to testing the previously developed by the authors method of temperature exposure from the influence of solar radiation on the stress-strain state of the span with an orthotropic plate. Instrumental measurements of deflections of the main beams in the hot season were carried out. With the help of a finite element complex, the stress-strain state of the load-bearing elements of the span was studied for each case of exposure to solar radiation, taking into account instrumentally measured temperatures. The limits of satisfactory coincidence of the results of calculations obtained on the basis of instrumental measurements of deflections and deformations of the main beams of the span under the influence of solar radiation and calculation in the program of the finite element method are determined.
Ijtihad Khalifah Uṡmān bin ‘Affān dan Implikasinya dalam Perekonomian Islam
Authors: Syaripudin Ahmad , Herman Sulkifli , Marwazi Manar Ahmad 
Published: June 2022

This research aims to examine the biography of the life of the friend of Uṡmān bin 'Affān ra., the methods and results of ijtihad of the companions and caliphs in the time of the caliphate Uṡmān bin 'Affān ra. in the Islamic economy. Research methods use qualitatively oriented library research in data collection with historical and normative approaches. The results showed that: first, from the biography of Uṡmān bin 'Affān it was found that he had the character of the leader of the rabbani in terms of knowledge, directing ability, and providing education, generosity, tolerance, gentleness, forgiveness, laughter, high shame, guarding himself, generous, brave, firm, firm, patient, fair, worship, wara’, easy to cry, fond of self-evaluation, zuhud, good at gratitude, looking for solutions to people's lives, looking for uniqueness and benefiting from its community specialists. Second, ijtihad Uṡmān bin 'Affān ra. In the islamic organization is upright on the general basis of its direction on the method of zakat, not neglecting tax attention to the people, taking what is the obligation of muslims to Baitulmal, taking what is the obligation of experts to Baitulmal properly, educating tax officials with a trustworthy nature, and keeping promises and eliminating financial irregularities that are stimulated in society. Third, the results of ijtihad had an impact on the financial distribution during the time of Uṡmān bin 'Affān ra. It was used to pay the salaries of governors and soldiers, build a maritime fleet, build and expand the al-Haram mosque and the Prophet's mosque, create springs to drink, subsidize materil to the muezzin.
Consumer behavior models of households and regional features of their formation in Ukraine
Authors: Bil Maryana M. , Mulska Olha P. 
Published: June 2022

The theoretical bases of research of consumer behavior of the population are developed. The main types of behavior according to the criteria of the subject, manifestation sphere, interaction, function, character, state, recurrence, influence, controllability are defined. The criterion of the manifestation sphere allows to select social, legal, cultural, political and economic behavior, one of the subspecies of which is consumer behavior. The consumer behavior can be studied in human, industrial and governmental dimensions. The human dimension allows to analyze consumer behavior at the levels of person, household, population and society. In this regard, the conceptual differences in the understanding of consumer behavior at different institutional and spatial levels are identified. Consumer, investment and savings activities of households in the regions of Ukraine are analyzed. The analysis for 2009-2019 confirmed a gradual increase in consumer aggregate expenditures by region, a nominal increase in the solvency of households, as they consume a smaller part of their cash income and save resources to finance non-consumer needs. However, such changes did not significantly improve the living standards of the population in conditions of instability. About 50 % of total household expenditures go to food and non-alcoholic beverages, while in developed countries households spend no more than 30 % on food. The share of investment expenditures of households, estimated by the average monthly expenditures on the purchase of shares, real estate, construction, capital repairs, bank deposits etc, increased from 4,1 % to 4,6 % for the period 2009-2019 and remains very low levels. The analysis of savings activity showed that the total capacity of households to accumulate resources increased 9,4 times during 2009-2019, but most regions show a lower level of accumulated total resources relative to the national indicator. The structure of consumer expenditures of households in the regions of Ukraine with consumer, investment and savings benchmarks to summarize the calculations is determined, which confirmed the low investment activity in conditions of instability. The generalized structure also indicates excessive interregional differentiation of the structure of consumer expenditures, which requires stimulating the investment activity of households as active agents of economic development.
Queen Domination of Even Square Boards
Authors: Weakley William D. 
Published: June 2022

The queen's graph $Q_{m \times n}$ has the squares of the $m \times n$ chessboard as its vertices; we identify the $m \times n$ chessboard with a rectangle of width $m$ and height $n$ in the Cartesian plane, having sides parallel to the coordinate axes and placed so that square centers have integer coordinates. Two squares are adjacent if they are in the same row, column, or diagonal of the board. A set $D$ of squares of $Q_{m \times n}$ is a dominating set for $Q_{m \times n}$ if every square of $Q_{m \times n}$ is either in $D$ or adjacent to a square in $D$. The minimum size of a dominating set of $Q_{m \times n}$ is the domination number, denoted by $\gamma(Q_{m \times n})$.
We give a new proof of the bound $\gamma(Q_{m \times n}) \geq \min \left\{m, n, \left\lceil \frac{m+n-2}{4} \right\rceil\right\}$, with implications for queen domination problems, and then consider square boards.
Let $n$ be an even integer and assume $Q_{n \times n}$ has a dominating set $D$ of size $n/2$ (which implies $\gamma(Q_{n \times n}) = n/2$). For $p \in \{ 0, 1 \}$, let $D_{p} = \{ (x, y) \in D \mbox{ : } x + y \equiv p \mbox{ (mod 2)}$. Say that $D$ is monochromatic if $D = D_{p}$ for some $p$; otherwise bichromatic. We show that if $D$ is bichromatic then $||D_{0}| - |D_{1}|| \leq 2$ and conjecture that if $n > 4$ then $D$ is monochromatic.
Assume further that $D$ is monochromatic. If $n \equiv 0 \mbox{ (mod 4)}$ then $n \in \{ 4, 12 \}$. If $n \equiv 2 \mbox{ (mod 4)}$ then odd integers $k = n/2, e, d$ with $1 \leq d, e \leq k$ satisfy the equation $d^{2} + (k-1)e^{2} = k(k^{2} + 2)/3$. We analyze six infinite sequences of solutions of this equation arising from Fermat-Pell equations, give monochromatic dominating sets of $Q_{n \times n}$ of size $n/2$ for $n = 2, 4, 6, 10, 12, 18, 30 \text{ (new)}$, and $130$, and show there are no others with $n < 238$.
TROJAN HORSE OF THE GREEK GOLDSMITHS
Authors: Polidovych Yu. B. 
Published: June 2022

The paper analyzes the images on the gold gorytos covers of the second half of the 4th century BC (fig. 1). These items were found in the Chertomlyk kurgan (now the Dnipropetrovsk Oblast, Ukraine), the Melitopol kurgan (now the Zaporizhia Oblast, Ukraine), the kurgan near the town of Ilyintssi (now Vinnytsia Oblast, Ukraine) and the kurgan 8 from group of Piat’ bratiev (Five Brothers) near the stanitsa Elizavetinskaya (now the Rostov Oblast, Russia). All gorytos covers are of the same size. They were made using a bronze matrix (or a set of matrices) at the same time and in the same workshop. Most modern researchers accept the interpretation of the central images on the gorytos covers as the scenes from the life of Achilles, the hero of the Greek epic, who was revered by Greeks as divine protector. K. Robert proposed this interpretation in 1891. B. V. Farmakov­sky singled out five scenes from the life of Achilles which sequentially represent the Hero from his childhood to the death (fig. 2: 1). In this paper the author identifies nine scenes (fig. 2: 2). Upper frieze: 1) a young man (possibly Apollo) teaches the boy Achilles archery; Thetis stands side by side, she worries about the fate of her son Achilles (fig. 3: 3); 2) Achilles says his mother Thetis goodbye before leaving to the island of Skyros; 3) Odysseus finds Achilles on the island of Skyros; 4) Deidamia, the wife of Achilles, runs away in despair; 5) Peleus hands over his weapon to his son Achilles. Lower frieze: 6) Briseis regrets her fate as a slave (fig. 3: 1—2); 7) Zeus establishes the events in the fates of the heroes (fig. 3: 4); 8) Achilles accepts the gifts from Agamemnon and makes peace with him, a wounded Odysseus is standing beside him; 9) Thetis carries the bag with ashes of Achilles and mourns his death (fig. 3: 5). All scenes tell about the events that preceded the manifestation of Achilles as a great warrior and hero: the beginning of warfare training, the events on the eve of the beginning of the Trojan War, the events at the walls of Troy and the quarrel with Agamemnon. Perhaps these images are associated with the magic of knowledge about the beginning, about the origin. In this case, this is knowledge about the origin of Achilles as a hero. Such magical knowledge made it possible to wield the power of the Protector Hero and direct it to the right direction like a prayer or a spell. Gorytos was the Scythian weapon. This gorytos series was made in some workshop of a Greek city-state, possibly in the Bosporus kingdom. They were donated to the Scythian rulers with a secret purpose: with the help of magical images to restrain the warlike moods of the Scythians, to pacify them. Therefore, these gorytos were like a wooden horse which, according to the Greek epic, the Achaean warriors left as the so-called gift of Troy and with its help captured this impregnable city.
ON THE HISTORY OF THE STUDY OF SCYTHIAN SITES AT DNIPRО NADPORIZHZHYA AREA (THE BURIAL GROUND NEAR THE 3rd QUARRY OF DNIPROBUD)
Authors: Mogylov O. D. 
Published: June 2022

During the period between First and Second World Wars a large-scale archaeological research was carried out in connection with the construction of the Dnieper Hydroelectric Station (the DniproHES). Large number of ancient sites felt into the area of flooding and destruction. In order to study them the Dniprobud expedition was organized which carried out significant excavations in 1927—1932 under the head of D. I. Yavornytskyi.
Among the excavated sites there was also the necropolis located on the eastern side of the 3rd quarry of the Dniprobud, on the right bank of the modern Zaporizhzhya city, on a high rocky slope of the Old Dnieper. The works took place in September — early October 1931 headed by the Dniprobud expedition member P. I. Smolichev. At the time of the excavation most of the necropolis included more than a dozen stone pavements had been destroyed. Only two burials survived under single-layer stone pavements with a diameter of 5.6—8 m. A menhir-like stone was recorded near grave 1. Single burials of the necropolis were made in catacombs with stone chambers’ barriers. Supposedly a child and a warrior were buried. Child’s burial was without grave goods. The man was accompanied by the arrowheads and pot.
The necropolis near the 3rd quarry of Dniprobud is a part of the whole system of Scythian necropolises with moundless burials on the Lower Dnieper. The area of such necropolises coincides with the Scythian settlement network. Settlements are often located near such necropolises which gives grounds to connect these burials with the population of such settlements. The topography of the necropolis on the slope above the Dnieper is typical for burial mounds in the Dnieper area. Burials made of stone are also typical for this region. This tradition dates back to the Bronze Age and is also known during the pre-Scythian period. The graves near the 3rd quarry of Dniprobud can be dated to the 4th century BC based on the types of burial structures and grave goods. Moreover, they can be considered to belong to the local ordinary nomadic Scythian population which began to change their way of life to the settled one. However, it preserved typical traditions of nomads’ funeral rites. In addition, the implementation of burials under stone pavements may indicate that the new ethnic substrate of the region, formed in Scythian Age, may have included some part of the aboriginal population that lived here since the Bronze Age and pre-Scythian times.