bluuebunny/crossref_metadata_2025 huggingface dataset:
On Shor's r-Algorithm for Problems with Constraints
Authors: Norkin Vladimir , Kozyriev Anton
Published: November 2023

Introduction. Nonsmooth optimization problems arise in a wide range of applications, including engineering, finance, and deep learning, where activation functions often have discontinuous derivatives, such as ReLU. Conventional optimization algorithms developed primarily for smooth problems face difficulties when applied to nonsmooth contexts due to discontinuities and other associated irregularities. Possible approaches to overcome these problems include smoothing of functions and applying non-smooth optimization techniques. In particular, Shor's r-algorithm (Shor, Zhurbenko (1971), Shor (1979)) with space stretching in the direction of the difference of two subsequent subgradients is a competitive non-smooth optimization method (Bagirov et al. (2014)). However, the original r-algorithm is designed to minimize unconstrained convex functions.
The goal of the work. The standard technique for applying this algorithm to problems with constraints consists in the use of exact non-smooth penalty functions (Eremin (1967), Zangwill (1967)). At the same time, it is necessary to correctly choose (quite large) the penalty coefficient of the penalty functions. Norkin (2020, 2022), Galvan et al. (2021) propose the so-called projective exact penalty functions method, which theoretically does not require choice of the penalty coefficient. The purpose of the present work is to study an applicability of the new exact projective non-smooth penalty functions method for solving conditional problems of non-smooth optimization by Shor's r-algorithm.
The results. In this paper, the original optimization problem with convex constraints is first transformed into an unconstrained problem by the projective penalty function method, and then the r-algorithm is used to solve the transformed problem. The results of testing this approach on problems with linear constraints using a program implemented in Matlab are presented. The results of the present study show that the standard method of non-smooth penalties combined with Shor's r-algorithm is fast, due to the use of the provided program to calculate the subgradients, but it requires the correct selection of the penalty parameter. The projective penalty method is slow because in this study it uses finite differences to calculate the gradients, but it is quite stable with respect to the choice of the penalty parameter. Further research will be aimed at investigating the differential properties of the projection mapping and reducing the time of computing subgradients for account of parallel calculations. Keywords: Subgradient descent, constrained optimization, r-algorithm, exact projective penalty.
Sustainable spatial strategies for mitigating air pollution in quick commerce environments
Authors: Son Eunhye , Kwon Ki Han
Published: November 2023

This paper reviewed various studies on the impact of quick-commerce distribution services on the environment and local communities, with a particular focus on air pollution and increased packaging waste due to the increase in quick-commerce consumption. A systematic literature review was conducted using PubMed, Medline, ResearchGate, Google Scholar, and Scopus to comprehensively investigate and summarise the characteristics of quick commerce distribution, the impact of frequent logistics transport on air pollution, and the increase in packaging waste due to the increase in online shopping demand. Previous studies have mainly addressed the growth characteristics of quick commerce distribution services with the emergence of quick commerce. The results of this study show that quick-commerce distribution services are indeed associated with increased traffic due to frequent transport, which contributes to greenhouse gas emissions and traffic congestion in cities. In addition, due to the nature of quick-commerce consumption, packaging waste is also increasing due to excessive use of packaging materials for freshness and safe delivery. Therefore, this study suggests sustainable consumption behaviour using local shopping malls and private spaces to minimize environmental pollution in the era of changed distribution services.
Eco-Brick-Making Workshop for Cianjur Disaster Survivors
Authors: Utama Mukti , Nasution Sri Mulyani , T Dody Faraitody , S Asep Deden Rahmat , Anggraeni Lelly
Published: November 2023

The earthquake that rocked Cianjur on November 21 2022 with a magnitude of 5.6 caused around 58,000 residents to be forced to flee. The large number of evacuees and volunteers has caused a pile of garbage at the evacuation site. Seeing this fact, the Faculty of Psychology, Jayabaya University, in collaboration with Putra Indonesia Cianjur University, took the initiative to provide education and training in making eco-brick from used plastic drink bottles. Eco-brick is an easy and inexpensive way to reduce plastic waste that is difficult to decompose. The activity was carried out at MTSN 6 Cianjur on December 28, 2022. From this training, it is hoped that the community will have the ability to utilize waste bottled drinks in goods that have high economic value. Eco-bricks can be used as chairs, tables and even building additives. This activity is also a form of application of environmental psychology as a branch of psychology that studies the interrelationships between individuals and the physical environment, both the natural environment and the human-built environment; set an example and increase public awareness and concern to always maintain the cleanliness of the surrounding environment under any circumstances.
Introduction to Indonesia Through Extracurricular Empowerment Nasyid Vuttisatvittayanusorn School Krabi Thailand
Authors: Rama Rama Prasetyo , Oman Hadiana  , Hana Astria Nur  , Tio Heriyana  , Nanan Abdul Manan
Published: November 2023

The purpose of this research is to introduce Indonesia more deeply through the development of Nasyid Extracurricular activities at the Vuttisatvittayanusorn school. Vocal work is one of the things that is favored by students, especially women in the arts. Indonesia's existence is well known in this country which is nicknamed the white elephant. Departing from this background, the author tries to develop Indonesian-language nasyid directly. This type of research is field research using a qualitative descriptive approach. The implementation of this activity went through several stages, namely: (1) Holding FGDs with Vuttisatvittayanusorn school teachers and making official art extracurriculars through collaboration. (2) Conduct open recruitment for Vuttisatvittayanusornschool students. (3) Preparing and designing training concepts and schedules (4) Presenting students at the implementation of the Islamic religious festival which is held every month in Krabi Thailand. The impact of implementing these activities is that students are able to develop vocal exercises through extracurriculars and increase interest and use Indonesian properly.
Empowerment Public Based Nationality: Strengthening Indonesian National Values in Coastal Communities in Malaysia
Authors: Mustaid  , Oman Hadiana  , Tio Heriana  , Hana Astria Nur  , Rifqi Ahmad Fauzi
Published: November 2023

This community service located on the Deep Coast of Kuala Lumpur Malaysia aims to provide education about nationality. The aim of taking nationality is because it is very strategic with the problems explained in the discussion and also seeing the large number of Indonesians who are on the Inner Coast of Kuala Lumpur, Malaysia. The method used is several stages which are carried out according to the procedure. Based on the problems obtained, the author created the title " Nationality-Based Community Empowerment; Strengthening Indonesian National Values in the Intellectual Community in Malaysia" Because Indonesian students and people have been in Malaysia for quite a long time so they really lack national insight. The content of the material presented is the importance of maintaining Indonesian national values, namely through programs implemented in the field. With this national-based strengthening, students and the community can certainly increase their understanding and enthusiasm to continue loving their homeland even though they are far from Indonesia
Identification of Potential Local Food Ingredients as a Food Source for Stunting Prevention in Langkat District
Authors: Eka Febriyanti  , Leylia Khairani  , Siti Hajar
Published: November 2023

Stunting is a child nutrition problem that is an important concern in Indonesia because of the large number of complications it causes, such as impaired growth and development, cognitive problems, decreased immune system, risk of metabolic disease and socio-economic problems. Indonesia's stunting prevalence is high, still above 20% (21.6%). Langkat Regency has the potential for local food ingredients that can meet the nutritional needs of families so as to prevent malnutrition and stunting. The aim of this community service is to identify the potential of local food ingredients. The method used was a Focus Group Discussion with relevant stakeholders in Langkat Regency. From the results of the discussion, it was found that the potential for local food ingredients were rice, fish, vegetables and local fruit such as bananas, rambutan and papaya. Furthermore, training is needed to process the available food sources so that they are highly nutritious and affordable for the community.
Operating Cost Efficiency to Increasing Net Profit of F&B Department at Hotel Indigo Bali Seminyak Beach
Authors: Decky Cipta Indrashwara  , Remses Re Dream JS Jacko , Tapa I Gede Fery Surya
Published: November 2023

On 2019 and 2022, a year before and after the Covid-19 pandemic, indicates fluctuating conditions in net profit and increasement in operational costs of F&B Department Hotel Indigo Bali Seminyak Beach. This writing aims to present a solution to reduce operational costs and increase the percentage of net profit. The method used is assistance in implementing cost leadership and the EOQ (Economic Order Quantity) approach in price break cases. By implementing cost leadership strategy and EOQ (Economic Order Quantity) in price break cases, the F&B Department of Hotel Indigo Bali Seminyak Beach will get optimal order quantities and the best prices from suppliers, reduce operational costs, and set lower selling prices.
The Role of Community Reading Park as A Smart Solution in Increasing The Interest in Reading at Pamupukan Village
Authors: Khumairaa Rizqika , Irfan Fajrul Falah  , Yani Suryani Cahyaningrum  , Aisyah Paradilla  , Rizqie Abu Chaery
Published: November 2023

Good literacy skills positively impact various aspects of life, including education, economy, and participation in social life. However, interest in reading is still a serious problem in many countries, including Indonesia. To overcome this problem, reading parks was born as an effective solution. This service activity aims to describe the role of the community reading park (TBM NURUL ILMI) in Bakom hamlet, Pamupukan village, Ciniru, Kuningan district in increasing the reading interest of the Pamupukan community. The service model used is Community-Based Development. Data collection uses observation, interviews, and documentation. Participants in the service involved Asatidz and several residents of Bakom hamlet. Participants in the service involved 7 leaders in Pamupukun village and Bakom hamlet. With the TBM NURUL ILMI, students have a place or facility to increase students' interest in reading so that their literacy skills increase. This service implies that it is expected to be able to bridge students in Bakom village so that they are more active in reading to add broader insights and knowledge.
Increasing Understanding About the Wise Use of Social Media for Depok Communities
Authors: Heru Sugiyono  , Heru Suyanto  , Suprima Suprima
Published: November 2023

The use of social media has become inevitable in modern life. Although it has many benefits, using social media can also bring risks and negative impacts, especially when not used wisely. This community service aims to increase the Depok community's understanding of using social media wisely. The method used in the implementation of community service is by conducting community service activities face to face with the people of Depok City , which is located in the Rangkap Jaya Sub-District, Pancoran Mas District - Depok City. The results of this program show a significant increase in understanding among the people of Depok. Community service program participants reported being better able to spot fake news, maintain online privacy, and interact ethically on social media. In addition, participants were also more aware of potential dangers such as online bullying and the spread of false information. This community service program has succeeded in creating positive changes in the social media usage behavior of the people of Depok. This proves the effectiveness of a community-based approach in increasing digital literacy. These findings can serve as a reference for similar efforts in other communities, promoting wiser and more responsible use of social media throughout society.
Capacity Building of Dage Craftsmen Group Ciberung Village Through Organizational Governance Training
Authors: Winati Famila Dwi , Susanto Irwan , Aiza Yudha Pratama  , Nurul Latifasari
Published: November 2023

Ciberung Village is one of the villages in Ajibarang Sub-district, Banyumas Regency, Central Java, known as the center of dage production and business. The typical dage of Ciberung Village is made from copra pulp or cake. Currently, the production and marketing of dage as a village potential is still managed individually by each craftsman. Thus, dage products on the market often need to be standardized in terms of taste, quality, texture, and price. These standardization efforts then impact the uneven economic benefits felt by dage craftsmen. Therefore, this community service activity aims to increase the community's competitive advantage through mentoring and reactivating dage craftsmen groups through institutional and organizational governance training. This program consists of four main stages: analysis of partner conditions, focus group discussions, socialization and training, and evaluation. Through this activity, the understanding of the community and village government regarding the management of dage business and production in an integrated manner through groups and its benefits can increase. The program evaluation results showed that 93% of the craftsmen agreed to create a Dage Craftsmen Group. In addition, there was an increase in understanding of the organization in general to understanding the benefits of establishing dage craftsmen in terms of economic, marketing, and social aspects with an average of 92.5%.
Automatic Machine of Distributed Fish Feed Based on Arduino Uno
Authors: Novianto Sentot , Supriyadi  , Adji Abigunto Amoro , Putri Larasati Rizky , Komara Rangga , Amrullah Gilang  , Jesika Erventy  , Maria Stevanie Dwi  , Aditya Pradika  , Halomoan Ezra
Published: November 2023

The need for feed in fish-keeping ponds is vital for the survival of the fish that are kept. Some fishpond farmers still provide fish feed manually and it is felt to be inefficient. On the other hand, the focus of farmers can be focused on maintaining fishponds. This PKM activity utilizes appropriate technology as an automatic feed tool for spreading tilapia fish feed. The driving of this feed is connected to a controller which functions to regulate the spreader of tilapia feed regularly and the design is made to achieve the spread of tilapia feed with a large capacity of 50 kg each e day. The use of this tool was conducted in tilapia fish maintenance/cultivation using ponds/ponds on land. The placement location is in the Karawang sub-district, West Java.
Accompaniment of Houswives' Role in Increasing Family Income Through Utilizing Potato Harvest Remains in Dieng Village
Authors: Jinggo Aldino  , Yeny Fitriyani  , Ali Rochmat
Published: November 2023

The role of housewives is very important in the family and society in general. A housewife is responsible for running the household and supporting the family's welfare. The assistance aims to help housewives, especially those who work as farm labourers in Dieng Village, utilize the remaining potato harvest into processed products with a higher selling value. Mentoring was provided to 10 homemakers working as agricultural labourers for 14 days, 14-30 September 2023. The problems were a need for more knowledge and skills in processing potatoes into processed products and challenges in marketing these products. In response to this problem, we designed a series of assistance on potato processing and marketing strategies via social media. The approach taken in this service activity uses Participatory Action Research (PAR). The PAR approach includes research by identifying problems that occur. Action assists in managing potato waste and marketing via Instagram. Participatory activities supported by homemakers can realize results and increase productivity and the family economy. Potatoes have many uses and can be processed into various foods. This assistance has shown positive results, and housewives have been able to innovate in processing leftover potatoes and marketing them through social media.
Implementation of A Transformative Learning Model in Supervising Non Formal Education Institution in the Submission of Accreditation
Authors: Hasan Fuad , Hendrawijaya Arief Tukiman , Ariefianto Lutfi
Published: November 2023

PKBM Sumber Ilmu, The partner of this community services has failed to pass the first steps of pursuing the accreditation. The cause of this failure is that the formal education mindset is still embedded in the managers and educators which influence the pattern of preparing accreditation documents. As the result, the document was not satisfy the assessor which assesst the requirement. This community services try to provide supervission for the managers and tutors of PKBM Sumber Ilmu so they can (1) prepare accreditation documents that are in accordance with the characteristics of non-formal education, and (2) prepare maximum supporting evidences for fields assessment. This program implement transformative learning and andragogy approach which incude two main activities namely workshop and assessment simmulation. The stage of activities are providing material related to accreditation documents and evidences of field assessment for non-formal education units, providing assistance to make sure the suitability of the documents and evidences, and carry out field assessment. The result of this community services are (1) the achievement of the accredation documents reach more than 80%, and (2) the readiness of supporting evidence for field assessment reach 80%. Because of those result, the PKBM Sumber Ilmu are ready for the whole accreditation process.
The Implementation of Rotary POC Technology for Organic Fertilizer Production in Tarahan Village, South Lampung
Authors: Fahni Yunita , Sanjaya Andri , Mustafa  , Saputri Desi Riana , Herlambang Aldillah
Published: November 2023

Tarahan Village is one of the larger villages in Katibung District, South Lampung. Despite not being classified as an agricultural region, Tarahan Village exhibits remarkable productivity in cultivating vegetables and fruits. So far, organic waste from fruits and vegetables has been discarded and burned or used only for animal feed. The large volume of unprocessed fruit and vegetable waste causes various problems for village residents, both directly and indirectly. Besides that, the village's intensive horticultural farming activities have encouraged the increased use of inorganic fertilizers. This pollutes the environment and harms the soil, organisms that live in the soil, and humans who consume these horticultural products. The application of liquid organic fertilizer, specifically POC, is deemed necessary to effectively address the issue of fruit and vegetable waste management while ensuring the quality of organic horticultural products. A composter is a suitable technology employed for the production of liquid fertilizer. Since oxygen is crucial for microorganisms in decomposing organic matter, the POC produced through the aerobic composting process will mature more quickly and not produce offensive odors. The goal of implementing this technology is to spread the word that garbage can be turned into something valuable if managed properly, leading to a cleaner community and more economic opportunities. The rotary POC technology scheme consists of a plastic drum that is supported by an iron structure. The drum is furnished with a rotating lever designed for the purpose of stirring, thereby facilitating the uniform mixing of organic material upon the addition of the bioactivator. The agitation of the solution facilitates the efficient execution of the aeration process. The equipment scheme has been developed with the aim of enhancing the effectiveness and efficiency of composting with regard to both time management and the quality of the final outcomes. This technology has the potential to be an alternative solution for dealing with household waste, and the product in the form of POC has the potential to reduce the use of inorganic fertilizers.
Healthy Life Education for Students In Malaysia
Authors: Mujiarto  , Miftahul Falah  , Budi Hendrawan  , Gilang Sepriangga Nuryudi  , Desta Hikmah Ramdani  , Joan Sepni Subagja  , Reza Hawari  , Adam Firdaus  , Slamet Rebiyanto  , Anggia Suci Pratiwi  , Milah Nurkamilah  , Rissa Nuryuniarti  , Aceng Sambas  , Neni Nuraeni  , Gugun Gundara
Published: November 2023

Healthy living behavior is a reflection of a family lifestyle that always pays attention to and maintains the health of all family members. School-age children are a critical age group because at that age a child is vulnerable to health problems. In addition, school-age children are also in a condition that is very sensitive to stimuli so they are easy to guide, direct, and still have good habits, including healthy living habits. Children of this age also have the trait of always wanting to convey what they receive and know from other people. The results of observations made at the Kuala Langat Malaysia Guidance Centre still have a lack of healthy behavior. The conditions of the students were very diverse and the facilities were inadequate, because all classes, from grade 1 to grade 6, were made into 1 class. Washing hands with soap (Hand Hygiene) is one of the healthy living behavior in students. This is important for children who are vulnerable to both communicable and non-communicable diseases. The method of implementing community service is through education and the practice of washing hands with soap directly to students. The results show that students and teachers are very enthusiastic and follow every step practiced by the presenters. they were happy and practiced together after the activity was over. By providing education on healthy living, especially hand washing, it is hoped that teachers and students at the Kuala Langat Guidance Centre will have good and healthy habits.
Problematika Implementasi Kebijakan “Merdeka Belajar” dan Peranan Guru Sekolah Dasar
Authors: Tobing Jessica Angeline De Eloisa , Devyanne Oktari  , Amala Sundari
Published: November 2023

Kurikulum Merdeka Belajar merupakan kebijakan terbaru pada dunia pendidikan. Secara khusus akan  dipaparkan berbagai problematika dalam penerapan kebijakan Merdeka belajar. Metode yang digunakan dalam penelitian ini ialah analisis deskriptif dengan kajian kepustakaan (library research) dimana pengumpulan data diperoleh dari berbagai literatur yang sesuai, baik dalam bentuk teks tertulis maupun soft copy. Melalui studi literatur yang telah dilakukan penulis dapat mengetahui mengenai konsep merdeka belajar dan juga problematika yang hadir dalam pengimplementasian merdeka belajar disekolah. Oleh karena itu sebagai guru Sekolah Dasar harus mampu menerapkan merdeka belajar dalam merumuskan inovasi dan pengembangan kurikulum di Sekolah Dasar.
Literatur Review Konseling Konstruksi Karier
Authors: Arumsari Cucu , Supriatna Mamat , Yustiana Yusi Riksa , Yulianto Eko
Published: November 2023

Tinjauan literatur nyajikan perkembangan penelitian dalam bidang konseling konstruksi karier dari tahun 2015 hingga 2022. Selama periode ini, penelitian dalam konseling konstruksi karier telah mengalami variasi dalam jumlah publikasi, dengan peningkatan jumlah publikasi pada tahun 2016 dan 2021. Seluruh artikel mengungkapkan bahwa permasalahan yang diangkat adalah mengkonstruksi rencana karier individu berdasarkan pemaknaan atas cerita hidup. Melalui pemaknaan cerita hidup, konselor dapat menggali kisah dan alasan individu memilih profesi konselor karier yang berkontribusi dalam dunia. Penelitian ini memperkuat pemahaman tentang beragam pendekatan dan teknik yang dapat digunakan dalam konseling konstruksi karier, serta pentingnya pemahaman identitas dan pembuatan makna dalam pengembangan karier individu. Pentingnya relevansi CCI dalam berbagai kelompok usia dan adaptasi teknologi dalam proses konseling karier. Dalam keseluruhan, perkembangan penelitian dalam konseling konstruksi karier selama periode ini menggarisbawahi pentingnya pemahaman identitas dan pembuatan makna dalam pengembangan karier individu, serta beragamnya pendekatan dan teknik yang dapat digunakan oleh konselor untuk membantu individu mencapai tujuan karier.
Penerapan Model Problem Based Learning (PBL) Dengan Metode Field Trip Terhadap Motivasi Dan Hasil Belajar IPS Peserta Didik Kelas IV SD Telkom Makassar
Authors: Nurul Hidayah U  , Muslimin Abdul Aziz , Quraisy Hidayah
Published: November 2023

Penelitian ini bertujuan   untuk menganalisis pengaruh penerapan Model Problem Based Learning (PBL) dengan Metode Field Trip terhadap motivasi dan hasil belajar IPS peserta didik kelas IV SD Telkom Makassar. Penelitian ini adalah penelitian kuantitatif dengan menggunakan true eksperimen yang yang menggunakan rancangan pretest posttest only control. Penelitian ini dilibatkan oleh 2 kelas yaitu kelas Kontrol dan Kelas Eksperimen yang masing-masing kelas berjumlah 32 siswa. Instrumen yang digunakan adalah lembar validasi, angket respon siswa dan guru, dan lembar aktivitas siswa serta guru. Hasil data posttest diperoleh rata-rata hasil belajar siswa pada kelas control 61,66 % dengan kategori yakni sangat rendah yaitu 28,16%, rendah 31,25%, sedang 0%, tinggi 0% dan sangat tinggi berada pada presentase 0%. Nila rata-rata hasil belajar kelas eksperimen adalah 79,41. Hasil belajar IPS menggunakan model pemebelajaran Problem Based Learning mempunyai hasil belajar yang lebih baik dibandingkan dengan menggunakan model pembelajaran Konvensional.
Kedwibahasaan Kelompok Dewasa (Studi Deskriptif terhadap Masyarakat Blok Karang Asem, Desa Sindang Mekar, Perwakilan Kecamatan Duku Puntang, Kabupaten Cirebon)
Authors: Nurjanah Nunuyu , Srihilmawati Rostika
Published: November 2023

Penelitian ini bertujuan untuk mendeskripsikan mengenai (1) tingkat kedwibahasaan masyarakat blok Karang Asem, Desa Sindang Mekar, Perwakilan Kecamatan Duku Puntang, Kabupaten Cirebon; (2) fungsi-fungsi penutur dalam pememakaian bahasa; (3) pergantian dalam penggunaan bahasa; dan (4) keadaan interferensi masyarakat. Penelitian ini menggunakan metode deskriptif. Teknik pengumpulan yang digunakannya yaitu teknik studi lapangan (wawancara dan observasi) dan studi pustaka. Hasil penelitian ini di antaranya: (1) tingkat kedwibahasaan masarakat dalam penggunaan bahasa sangat besar; (2) fungsi dalam pemakaian bahasa daerah (Sunda dan Jawa) lebih banyak menunjukan bilingualisme majemuk; (3) pergantian bahasa yang dipengaruhi oleh topik dan orang yang terlibat dalam penggunaan B1, B2, dan B3 sangat beragam dan saling mempengaruhi; dan (4)  adanya interferensi dari percampuran B1, B2, dan B3 yang digunakan terus-menerus secara bergantian dalam komunikasi masarakat.
PROTECCIÓN LEGISLATIVA PERUANA FRENTE AL TRÁFICO INTERNACIONAL DE TORTUGA GALÁPAGOS (CHELONOIDIS NIGER)
Authors: Lamadrid Vences Evelyn Lorena , Rumiche Rochabrún Silvia Carolina , Odicio Bueno Jose
Published: November 2023

El presente artículo tiene por finalidad expresar reflexiones personales de los autores en torno a una especie de fauna silvestre de vital importancia en el equilibrio ecosistémico como es la tortuga gigante de galápagos, sus características biológicas, ambientales, los mecanismos legales de protección de dicha especie y los esfuerzos concretos de persecución delictiva frente a la caza, captura, tráfico y comercialización. Se ha utilizado información biológica referida a la especie de fauna silvestre, el análisis en conjunto respecto a la legislación vigente que protege y conserva la especie, las fortalezas y debilidades de los tipos penales ambientales, con especial atención de aquellos referidos concretamente a la protección de especies, frente a las actividades antrópicas que importan su afectación ambiental.
Inégalités géométriques pour des valeurs propres de Steklov de graphes et de surfaces
Authors:   , Perrin Hélène
Published: November 2023

The aim of this thesis is to obtain geometric inequalities for Steklov eigenvalues of 2-dimensional Riemannian manifolds and graphs. The results obtained relate to different situations. On the one hand, our interest focuses on the geometry of the first non-zero Steklov eigenvalue σ1 of a graph with boundary. For this eigenvalue, we give a lower bound which depends on an upper bound on the extrinsic diameter of the boundary and on an upper bound on the number of vertices of the boundary. Another result is an upper bound for some subgraphs of a Cayley graph with polynomial growth, which shows in particular that σ1 tends to 0 when the number of vertices of the subgraph tends to infinity and thus generalizes a result of Han and Hua obtained for subgraphs of Zn. A second goal of the thesis is to obtain lower bounds for the first non-zero Steklov eigenvalue σ1 of a Riemannian manifold M whose boundary has several connected components. In this case, the geometry of M far from the boundary can have a strong influence on σ1. In order to specify the form of this relation we study Riemannian manifolds whose boundary has a cylindrical neighborhood. In dimension 2, assuming that the Gaussian curvature of M is bounded below, we give a lower bound which depends on an upper bound on the extrinsic diameter of the boundary, an upper bound on the length of the boundary and a lower bound on the radius of injectivity at the points of a certain subset of M. Finally, we give lower and upper bounds for the first Steklov eigenvalues of hyperbolic surfaces with geodesic boundary, which depend on the length of some families of geodesics that separate the boundary.This result is similar to a classical result of Schoen, Wolpert and Yau for Laplace eigenvalues of a closed hyperbolic surface.
Chaînes alimentaires de type Lotka-Volterra bruitées et quasi-stationnarité avec frontières mobiles aléatoires
Authors:   , Bourquin Antoine
Published: November 2023

In the first part of this thesis, we study Lotka-Volterra food chains. This model considers n species whose interactions are governed by Lotka-Volterra equations. More precisely, species i is the prey of species i+1 and the predator of species i−1. In addition, there can be intra-specific interactions but there can be no other interactions than those mentioned above. First, we consider this model as a stochastic differential equation, i.e. we assume that the drift is a Lotka-Volterra type food chain. In this model, we also assume that the noise is degenerate and, more precisely, that it only affects species 1 or species n. We show that, under these assumptions, species persistence is equivalent to the drift having an equilibrium point with all its coordinates positive. Under the condition that all species are present, we understand persistence to mean that the semigroup converges in total variation to a single invariant probability measure whose support is contained in the positive orthant. If we neglect the intra-specific competition of at least one species, then we show that the speed of convergence is polynomial. However, if all species have intra-specific interactions, then the speed of convergence is exponential. In a second step, we consider this model as a piecewise deterministic Markov process. I.e. we consider the model generated by the random switching between N food chains of the Lotka-Volterra type. We also assume that there are two food chains that differ only in the resources allocated to the first species. Under these conditions, we show that the persistence of species is equivalent to the positivity of the coordinates of the equilibrium point of the average chain. Furthermore, we show that the speed of convergence is exponential. In the case of extinction, we also determine which species become extinct and which species survive. We also show that the extinction rate is exponential while the semi-group converges in law to an invariant probability measure putting weight only on the surviving species. In addition, we also discuss the critical case and the sensitivity of the model to parameters. The second part of this thesis deals with quasi-stationarity with random moving boundaries. More precisely, we assume that the boundary can only take a finite number of possible values and that these changes are governed by a jump process. Under new Champagnat-Villemonais conditions, we show the existence of a Q-process and a quasiergodic measure. Moreover, we also show the ergodicity of the flow induced by the marginal law of the process conditioned not to be absorbed.
Вплив лазерного випромінювання та парів ртуті на структуру аморфних плівок Se100–xTex
Authors: Рубіш В. М. , Гасинець С. М. , Дуркот М. О. , Макар Л. І. , Пісак Р. П. , Стефанович В. О. , Ясінко Т. І. , Костюкевич С. А. , Костюкевич К. В.
Published: November 2023

Методом раманівської спектроскопії досліджено структуру ближнього порядку номінально чистих і витриманих у парах ртуті аморфних плівок Se100–xTex (0 ≤ x ≤ 15). Встановлено, що матриця номінально чис-тих плівок побудована в основному структурними угрупованнями Se8 і містить спіралевидні ланцюжки Sen різної протяжності, в яких частина атомів Se заміщена атомами Te. Процес заміщення Se на Te супроводжується зміщенням смуги при 236 см–1 в раманівському спектрі аморфної плівки Se в ділянку 210–214 см–1 у спектрах плівок Se100–xTex. При певних режимах лазерного опромінення (λзб = 532 нм) плівки системи селен-телур кристалізуються. Модифікування аморфних плівок Se100–xTex ртуттю призводить до формування в їхній матриці кристалічних включень селеніду ртуті.
Гібридна згорткова мережа для обробки зображень рентгенівських знімків для виявлення захворювання COVID-19
Authors: Федорченко Є. М. , Олійник А. О. , Степаненко О. О. , Федорончак Т. В. , Чорнобук М. О. , Корнієнко С. К.
Published: November 2023

Проведено аналіз різних моделей машинного навчання в розрізі діагностики ураження COVID-19 за рентгенівськими знімками легень пацієнтів. У результаті було розроблено модель, яка заснована на гібридній згортковій нейронній мережі, що здатна досягти точності класифікації у 91 %. Модель може використовуватись як допоміжний інструмент діагностики для медичного персоналу, що призведе до зменшення вірогідності лікарської помилки.
Застосування сценарного підходу при розробці управлінських рішень (на прикладі сценарію управління корабельним з’єднанням)
Authors: Додонов О. Г. , Путятін В. Г. , Куценко С. А. , Сенченко В. Р. , Додонов Є. О.
Published: November 2023

Розглянуто проблемні питання, що пов’язані із використанням принципів і положень системного аналізу у сфері вирішення задач підготовки складних управлінських рішень на прикладі сценарію управління корабельним з’єднанням. Серед методів системного аналізу доцільним є використання сценарного підходу, адже він дозволяє побудувати та порівняти альтернативні варіанти розвитку процесів. Практична реалізація такого підходу відбувається завдяки застосуванню моделюючого комплексу, який забезпечує методологію прогону циклів імітаційного моделювання з метою оцінки реалістичності кожного із варіантів розвитку сценарію. Як математичний апарат використано Мережу Байєса, що дає можливість відобразити в моделі процесу причинно-наслідкові зв’язки між різними чинниками (подіями) процесу та змінами середовища. Кінцевою метою сценарного підходу є формування управлінських рішень, які ґрун-туються на розрахунках імовірності виникнення різних варіантів розвитку сценарію при настанні тих чи інших подій, а також кількісної оцінки ефективності будь-якого рішення. Ефективність застосування сценарного підходу продемонстровано при формуванні складних управлінських рішень на прикладі вирішення задач управління корабельним з’єднанням.
The Mediating Role of Work Meaning on the Influence of Organizational Support and Teacher Creativity
Authors: Wahib Abd.
Published: November 2023

This research aims to determine and analyze the influence of organizational support on teacher creativity and the meaning of work as a mediating variable. This research was conducted at MI Mujahidin. This research is quantitative. Using an explanatory research approach with a survey approach. The questionnaire was prepared based on research variables: organizational support, teacher creativity and meaning of work. Research data was taken from 100 teachers who were the samples for this research. Data collection was carried out using random sampling techniques. Data analysis uses the Partial Least Square (PLS) approach using Smart PLS software. The results of hypothesis testing show that organizational support has a positive effect on teacher creativity. Institutional support can stimulate an increase in creative ideas for teachers. Organizational support has a positive impact on the meaning of work. Organizational support will increase the meaningfulness of performance. The meaning of work has a positive influence on teacher creativity. Educational institutions support teachers and stimulate creativity and innovation. The mediating meaning of work on the positive influence of organizational support on teacher creativity. Thanks to the support from all elements at school, teachers will feel more meaningful for themselves. Organizational support from the workplace, recognition and motivation make teachers further develop their creative ideas and think that their work is essential and brings meaning to their work.
Student Organization Activities in the Development of Emotional Intelligence in Islamic Boarding Schools
Authors: Samsirin Samsirin , Khoiriyah Dini Rofiatul , Solihah Dwi Aprilia , Rahmawati Amanda
Published: November 2023

This research aims to discover how student organizations contribute to the growth of emotional intelligence. This research uses qualitative descriptive analysis. Using three data collection techniques: documentation, observation and interviews. Data analysis includes domain analysis, taxonomic analysis, and componential analysis. The results of the data analysis found that organizations have a role in the emotional development of organizational administrators, including cultivating the corporate spirit, consultation spirit, awareness of other people's points of view, and awareness of controlling anger. As well as lack of self-confidence and poor communication between administrators are the two main obstacles to developing emotional intelligence. Based on data analysis findings, companies can help organizational administrators grow emotionally by cultivating the corporate spirit, consultative spirit, awareness of others' points of view, and awareness of behavioural control.
Pengaruh Budaya Organisasi Terhadap Kinerja Karyawan Perum Bulog Kanwil Lampung
Authors: Kesuma Danesa Pramesya , Khairudin
Published: November 2023

The purpose of this study is to look at how worker performance at the Perum Bulog Lampung Regional Office is affected by organizational culture. The population that is the focus of this research is all 48 employees who work at Perum Bulog Lampung Regional Office, so all of them are research objects. This research does not use a sample method, considering the limited number of employees in this company. Therefore, all 48 employees of the Perum Bulog Lampung regional office became research subjects. The data collection method in this research involves an observational approach and distribution of questionnaires via Google Form. The data obtained was then analyzed using validity, reliability, and simple linear regression tests. The research results show that organizational culture at the Lampung Regional Office does not have a significant influence on the performance of Perum Bulog employees at the Lampung Regional Office. This can be concluded from the results of the analysis, where the calculated t value (1.304) is lower than the t table value (2.013), and the significance level (0.199) is greater than 0.050. Therefore, the hypothesis (H1) in this study cannot be confirmed or supported.
Analysis of Corporate Governance Practices on Financial Performance of Foreign Banks in Kenya: A Case of Standard Chartered Bank
Authors: Ingabire Dina , Onsiro Martin
Published: November 2023

The study analysed the effects of corporate governance on the financial performance of foreign banks in Kenya. The specific objectives of this study were to: examine the effect of board size on financial performance of foreign banks in Kenya, to establish the effect of Chief Executive Officer duality on financial performance of foreign banks in Kenya and evaluate the effect of board composition on financial performance of foreign banks in Kenya. The main theories for this study were the agency theory and stewardship theory. Descriptive design was used by the study. Stratified sampling was employed as the sample method in the study. A total of 176 participants was analyzed in this investigation, and the sample size consisted of 122 participants. The research methodology primarily relied on gathering data through primary research. A well-designed questionnaire was used to collect information from the target audience. Data was cleaned, coded and analyzed. The study made use of both descriptive and inferential statistics. Findings indicated a positive and significant association between board size and financial performance of foreign banks in Kenya (β =0.233, p < 0.05). There was a positive and significant relationship between Chief Executive Officer duality and financial performance of foreign banks in Kenya (β =0.371, p < 0.05). The link between board composition on financial performance of foreign banks in Kenya was positive and significant (β =0.451, p < 0.05). The study concludes that effective communication between the board of directors and the executive management team is vital for a company's financial performance. The size of a board of directors can directly affect how decisions are made within the organization. Skills, knowledge and experience of board members are foundational to their ability to effectively oversee the organization's operations and strategic direction. The study recommends that foreign banks in Kenya should ensure the right number of people who serve on the board of directors. The banks should have a policy on Chief Executive Officer duality as it helps enhance the financial performance. It is recommended that foreign banks board members should possess the right skills, knowledge and experience that would help to effectively oversee the organizations’ operations and strategic direction.
Processo agli untori e processo ai carbonari (Terza postilla a «Gli amici di Brusuglio»)
Authors: Becherucci Isabella
Published: November 2023

La tragica vicenda del processo ai supposti untori della peste del 1630 e
dell’errata sentenza emessa contro vittime innocenti fu una matrice importante nella
scelta del secolo XVII in cui ambientare la vicenda dei Promessi sposi, tanto più in considerazione
delle procedure sommarie che venivano condotte in quegli stessi anni contro
amici e conoscenti imputati di Carboneria.
Gian Pietro Lucini e la violenza militarista
Authors: Lovari Gianmarco
Published: November 2023

Il contributo intende trattare i caratteri salienti dell’antimilitarismo di Gian
Pietro Lucini, su tutti la particolare valenza affidata dall’autore al periodo di coscrizione obbligatoria, ma anche rilevare i possibili punti di contatto fra le traversie del protagonista
di Spirito ribelle e quelle di Vincenzo D., personaggio principale del romanzo Una nobile follia di Igino Ugo Tarchetti.
Role of Depression and Impulsivity as Determinants of Suicidal Ideation among Students in Ibadan, Nigeria
Authors: Okoro Don Chinwendum , Okhakhume Sylvester
Published: November 2023

This study investigated the relationship between the risk factors of depression and impulsivity, and suicidal ideation among students of University of Ibadan. It adopted a cross-sectional survey research design and used questionnaire for data collection. Three scales were used in eliciting information from the students. Independent T-test Analysis was used in analyzing the data. P< .001 level of confidence was considered significant. Two hypotheses were formulated and analyzed using independent t-test. The results show that high depressive and impulsive students have a greater likelihood of engaging in suicidal ideation than low depressive and impulsive ones (t = -5.694, df= 402, p< 0.001) and (t = -5.207, df= 402, p<0.001). Consequently, students who are depressed as well as those who are impulsive must be closely monitored and assisted since they are at a higher risk of engaging in suicidal ideation than those who are not.
Determinants of Hand Washing Practices and Diarrhea Prevention among Mothers of Under-Five Children in Ibadan, Nigeria
Authors: Salami Kabiru K.
Published: November 2023

Childhood diarrhea is the third-leading paediatric, diagnosed in hospitals and causes nearly one-quarter of under-five death in Nigeria. Morbidity and mortality for children through diarrhea are influenced by poor hygiene practices including poor hand washing. Thus this study examines the practice of hand ‘washing by mothers as a preventive mechanism against diarrhea experience among children under age five. A pretested standardized questionnaire was administered to 600 mothers of children under age five and complimented with eight sessions of in-depth interview (IDI) conducted among mothers in Ibadan metropolis. Overall, about 58% of the mothers were within 30-39 years of’ age range, 11% had no formal education, about 31% reported diarrhea experience for their children 2 weeks before the survey while 84.5% of them sought hospital care during diarrhea episodes. Respondents reportedly drank water from stream (8.7%) and used faecal disposals (91.5%) different front water closet. hand washing after toilet use was reportedly common to all the respondents: 24,3% washed their hands with water only, while 35% reportedly washed their hands occasionally. Only 33.5% reportedly got information on hand washing practices from health workers. Education and income of the respondents influenced adoption of frequent hand washing practices (p<0.05), The study suggests focused health education for mothers through the media 011the importance of frequent hand washing practices.