bluuebunny/crossref_metadata_2025 huggingface dataset:
Modulation of alpha oscillations by attention is predicted by hemispheric asymmetry of subcortical regions
Authors: Ghafari Tara , Mazzetti Cecilia , Garner Kelly , Gutteling Tjerk , Jensen Ole
Published: November 2023

Evidence suggests that subcortical structures play a role in high-level cognitive functions such as the allocation of spatial attention. While there is abundant evidence in humans for posterior alpha band oscillations being modulated by spatial attention, little is known about how subcortical regions contribute to these oscillatory modulations, particularly under varying conditions of cognitive challenge. In this study, we combined MEG and structural MRI data to investigate the role of subcortical structures in controlling the allocation of attentional resources by employing a cued spatial attention paradigm with varying levels of perceptual load. We asked whether hemispheric lateralization of volumetric measures of the thalamus and basal ganglia predicted the hemispheric modulation of alpha-band power. Lateral asymmetry of the globus pallidus, caudate nucleus, and thalamus predicted attention-related modulations of posterior alpha oscillations. When the perceptual load was applied to the target and the distractor was salient caudate nucleus asymmetry predicted alpha-band modulations. Globus pallidus was predictive of alpha-band modulations when either the target had a high load, or the distractor was salient, but not both. Finally, the asymmetry of the thalamus predicted alpha band modulation when neither component of the task was perceptually demanding. In addition to delivering new insight into the subcortical circuity controlling alpha oscillations with spatial attention, our finding might also have clinical applications. We provide a framework that could be followed for detecting how structural changes in subcortical regions that are associated with neurological disorders can be reflected in the modulation of oscillatory brain activity.
Chronic intermittent hypoxia reveals role of the Postinspiratory Complex in the mediation of normal swallow production
Authors: Huff Alyssa D , Karlen-Amarante Marlusa , Oliveira Luiz M , Ramirez Jan-Marino
Published: November 2023

Obstructive sleep apnea (OSA) is a prevalent sleep-related breathing disorder that results in multiple bouts of intermittent hypoxia. OSA has many neurological and systemic comorbidities, including dysphagia, or disordered swallow, and discoordination with breathing. However, the mechanism in which chronic intermittent hypoxia (CIH) causes dysphagia is unknown. Recently, we showed the postinspiratory complex (PiCo) acts as an interface between the swallow pattern generator (SPG) and the inspiratory rhythm generator, the preBötzinger complex, to regulate proper swallow-breathing coordination (Huff et al., 2023). PiCo is characterized by interneurons co-expressing transporters for glutamate (Vglut2) and acetylcholine (ChAT). Here we show that optogenetic stimulation of ChATcre:Ai32, Vglut2cre:Ai32, and ChATcre:Vglut2FlpO:ChR2 mice exposed to CIH does not alter swallow-breathing coordination, but unexpectedly disrupts swallow behavior via triggering variable swallow motor patterns. This suggests that glutamatergic–cholinergic neurons in PiCo are not only critical for the regulation of swallow-breathing coordination, but also play an important role in the modulation of swallow motor patterning. Our study also suggests that swallow disruption, as seen in OSA, involves central nervous mechanisms interfering with swallow motor patterning and laryngeal activation. These findings are crucial for understanding the mechanisms underlying dysphagia, both in OSA and other breathing and neurological disorders.
Projection-specific integration of convergent thalamic and retrosplenial signals in the presubicular head direction cortex
Authors: Richevaux Louis , Lim Dongkyun , Nassar Mérie , Rodrigues Léa Dias , Mauthe Constanze , Cohen Ivan , Sol-Foulon Nathalie , Fricker Desdemona
Published: November 2023

Head-direction (HD) signals function as the brain’s internal compass. They are organized as an attractor, and anchor to the environment via visual landmarks. Here we examine how thalamic HD signals and visual landmark information from the retrosplenial cortex combine in the presubiculum. We find that monosynaptic excitatory connections from anterior thalamic nucleus and from retrosplenial cortex converge on single layer 3 pyramidal neurons in the dorsal portion of mouse presubiculum. Independent dual wavelength photostimulation of these inputs in slices leads to action potential generation preferentially for near-coincident inputs, indicating that layer 3 neurons can transmit a visually matched HD signal to medial entorhinal cortex. Layer 4 neurons, which innervate the lateral mammillary nucleus, form a second step in the association of HD and landmark signals. They receive little direct input from thalamic and retrosplenial axons. We show that layer 4 cells are excited di-synaptically, transforming regular spiking activity into bursts of action potentials, and that their firing is enhanced by cholinergic agonists. Thus, a coherent sense of orientation involves projection specific translaminar processing in the presubiculum, where neuromodulation facilitates landmark updating of HD signals in the lateral mammillary nucleus.
Neural interactions in the human frontal cortex dissociate reward and punishment learning
Authors: Combrisson Etienne , Basanisi Ruggero , Gueguen Maëlle C. M. , Rheims Sylvain , Kahane Philippe , Bastin Julien , Brovelli Andrea
Published: November 2023

How human prefrontal and insular regions interact while maximizing rewards and minimizing punishments is unknown. Capitalizing on human intracranial recordings, we demonstrate that the functional specificity toward reward or punishment learning is better disentangled by interactions compared to local representations. Prefrontal and insular cortices display non-selective neural populations to rewards and punishments. The non-selective responses, however, give rise to context-specific interareal interactions. We identify a reward subsystem with redundant interactions between the orbitofrontal and ventromedial prefrontal cortices, with a driving role of the latter. In addition, we find a punishment subsystem with redundant interactions between the insular and dorsolateral cortices, with a driving role of the insula. Finally, switching between reward and punishment learning is mediated by synergistic interactions between the two subsystems. These results provide a unifying explanation of distributed cortical representations and interactions supporting reward and punishment learning.
An improved hybrid whale optimization algorithm for global optimization and engineering design problems
Authors: Rahimnejad Abolfazl , Akbari Ebrahim , Mirjalili Seyedali , Gadsden Stephen Andrew , Trojovský Pavel , Trojovská Eva
Published: November 2023

The whale optimization algorithm (WOA) is a widely used metaheuristic optimization approach with applications in various scientific and industrial domains. However, WOA has a limitation of relying solely on the best solution to guide the population in subsequent iterations, overlooking the valuable information embedded in other candidate solutions. To address this limitation, we propose a novel and improved variant called Pbest-guided differential WOA (PDWOA). PDWOA combines the strengths of WOA, particle swarm optimizer (PSO), and differential evolution (DE) algorithms to overcome these shortcomings. In this study, we conduct a comprehensive evaluation of the proposed PDWOA algorithm on both benchmark and real-world optimization problems. The benchmark tests comprise 30-dimensional functions from CEC 2014 Test Functions, while the real-world problems include pressure vessel optimal design, tension/compression spring optimal design, and welded beam optimal design. We present the simulation results, including the outcomes of non-parametric statistical tests including the Wilcoxon signed-rank test and the Friedman test, which validate the performance improvements achieved by PDWOA over other algorithms. The results of our evaluation demonstrate the superiority of PDWOA compared to recent methods, including the original WOA. These findings provide valuable insights into the effectiveness of the proposed hybrid WOA algorithm. Furthermore, we offer recommendations for future research to further enhance its performance and open new avenues for exploration in the field of optimization algorithms. The MATLAB Codes of FISA are publicly available at https://github.com/ebrahimakbary/PDWOA.
Glomeromycota associations with bamboos (Bambusoideae) worldwide, a qualitative systematic review of a promising symbiosis
Authors: Sánchez-Matiz Juan José , Díaz-Ariza Lucia Ana
Published: November 2023

Background

Around the world, bamboos are ecologically, economically, and culturally important plants, particularly in tropical regions of Asia, America, and Africa. The association of this plant group with arbuscular mycorrhizal fungi belonging to the phylum Glomeromycota is still a poorly studied field, which limits understanding of the reported ecological and physiological benefits for the plant, fungus, soil, and ecosystems under this symbiosis relationship.

Methods

Through a qualitative systematic review following the PRISMA framework for the collection, synthesis, and reporting of evidence, this paper presents a compilation of the research conducted on the biology and ecology of the symbiotic relationship between Glomeromycota and Bambusoideae from around the world. This review is based on academic databases enriched with documents retrieved using different online databases and the Google Scholar search engine.

Results

The literature search yielded over 6,000 publications, from which 18 studies were included in the present review after a process of selection and validation. The information gathered from the publications included over 25 bamboo species and nine Glomeromycota genera from eight families, distributed across five countries on two continents.

Conclusion

This review presents the current state of knowledge regarding the symbiosis between Glomeromycota and Bambusoideae, while reflecting on the challenges and scarcity of research on this promising association found across the world.
El movimiento de pobladores en Chile y Venezuela (2010-2022): discursos y significados en torno a la autogestión del hábitat
Authors: Carroza-Athens Nelson
Published: November 2023

A pesar del importante interés suscitado por el movimiento de pobladores y pobladoras en América Latina, los discursos autogestionarios desplegados en sus luchas por la vivienda constituyen un aspecto poco explorado por la literatura, aun cuando esta dimensión es clave para la comprensión de sus repertorios de acción. El presente trabajo aborda la forma en que los y las protagonistas de estos movimientos populares en Chile y Venezuela significan la autogestión del hábitat. A partir del análisis de una treintena de entrevistas, se profundiza en los discursos y significados relativos a la autogestión, develándose cuatro categorías constitutivas: integralidad del hábitat, demanda de autonomía, pretensión de incidencia en el Estado y afán de transformación de la sociedad. Tales hallazgos permiten evidenciar las particularidades de la modalidad de producción adoptada por estos movimientos, y contribuir a una discusión más amplia sobre las distintas modalidades de producción del hábitat popular que acontecen actualmente en la región.
Circuitos productivos regionales, clústeres y cadenas globales de valor: notas sobre el caso de Vaca Muerta (Argentina, 2012-2022)
Authors: Scardino Marisa , García Ariel
Published: November 2023

El artículo analiza los aportes teóricos y metodológicos de los enfoques de circuitos productivos regionales, de clústeres y de cadenas globales de valor, empleados alternativamente para la comprensión espacial de las desigualdades sociales y los problemas del desarrollo en estructuras productivas desequilibradas en América Latina. El estudio se organiza en tres dimensiones de análisis que tornan operativo el diálogo entre los enfoques: espacio, escala y relación entre agentes. Luego, se recurre a ellos para abordar el caso de la producción hidrocarburífera no convencional en Vaca Muerta, buscando evidenciar los aportes y limitaciones analíticas de cada enfoque. Finalmente, se exponen las potencialidades explicativas de cada una de las perspectivas analizadas y se concluye que el enfoque de circuitos productivos regionales permite alcanzar una comprensión integral para abordar las problemáticas regionales latinoamericanas en función del modo particular en que concibe el espacio.
Toxicity Evaluation of Dual Fungicide SAAF (Carbendazim 12% and Mancozeb 63%) through Physiological Markers in Oreochromis mossambicus
Authors: Baliarsingh Akankshya , Mohanty Ankita , Sahoo Smrutimayee , Chhatoi Suraj Kumar , Sharma Kishan Kumar , Choudhury Neelanjana
Published: November 2023

The study was designed to evaluate the acute toxicity induced by SAAF in freshwater fish, Oreochromis mossambicus. Fungicides are widely used for pest management and increase crop output. When used in excessive doses, they are also exceedingly dangerous to non-target organisms. The present investigation is about changes in biochemical parameters in Oreochromis mossambicus due to toxicity induced by the application of fungicides in paddy-cum-fish ecosystem in India. The SAAF fungicide, a mixture of carbendazim (12%) and mancozeb (63%) is used to combat fungal diseases such as sheath blight, sheath rot, blast, and leaf spot diseases of rice plants. The present research aimed to determine the toxicity and evaluate the effect of sublethal concentrations of SAAF on some biochemical, haematological, and histological parameters of Oreochromis mossambicus after 10, 20 and 30 days. Oreochromis mossambicus were exposed to different concentrations of SAAF (10.5 mg/lit, 11.5mg/lit and 12.5 mg/lit) respectively and LC50 was determined. LC50 for SAAF was detected to be 13.5mg/lit using SPSS Vs.21. After 30 days of exposure, the individuals exposed to toxicity were sacrificed and the parameters were checked in the treated fish. Among biochemical parameters, total glucose, cholesterol, stress-related enzymes AST and ALT showed a significant increase while total protein showed a substantial decrease, whereas among haematological parameters, Haemoglobin, RBC, and PCV had risen and WBC and MCV showed a marked decrease. The tissue necrosis was quite prominent in the gill, heart, liver, kidney, and muscle after 30 days of exposure to the fungicide.
Effect of Primary, Secondary and Micro Nutrients on Maize Yield in the Wenchi Municipality, Ghana
Authors: Abednego Bavug , Bationo Andre , Ahenkan Pious
Published: November 2023

One of the major constraints related to maize (Zea mays L.) productivity is low soil fertility related mainly to continuous cropping without replenishment of depleted nutrients. In view of this, this study sought to assess the effect of different combinations of primary and secondary nutrients on the yield of maize in the Wenchi Municipality in the Brong-Ahafo Region. Five treatments - Control (T1), NPK (T2), NPK + S + Mg + Ca+ B + Cu + Mo+ Zn (T3), Manure (T4) and T3 + Manure (T5) - were tested in a field experiment in a randomized complete block design (RCBD) with four replicates. The test crop was Lake 601 maize variety.Data for the research was collected on total number of plants, stalk weight, hurst weight, cob weight, grain weight Nutrient Use Efficiency and Economic Viability. The data was analysed with analysis of variance (ANOVA) on all measured parameters and the results were presented in graphs. From the results gathered, it was realized that the application of NPK + Sec_MN had a more positive impact on dry shoot weight and grain weight.The results obtained from the field experiment also indicated that it was more efficient to combine both NPK and secondary nutrients in maize production compared to applying the other treatments assessed in the study; such that, the combined effect gave more yield and subsequently generated more money (income).Based on the results obtained in the research, it was recommended that; much attention should be given to T3 (NPK + Sec_MN). Possibly, different doses of this treatment should be further tested to know the actual extent at which the secondary nutrients and the NPK can be combined to give the maximum yield. Similar research should also be staged at a different location to know whether similar results would be obtained.
Unveiling the Nutritional Spectrum of Millet: An In-depth Review
Authors: Verma Neelendra Singh , Prajapati Om Prakash , Prajapati Rajkumar , Lohare Ramesh , Shukla Aditya
Published: November 2023

A comprehensive analysis of millets, small-seeded Poaceae family grains that have been traditionally cultivated in semi-arid regions of Africa and Asia. The primary objective is to elucidate the multi-faceted advantages of millets, encompassing nutritional, metabolic, and immunological benefits, in addition to their significance in sustainable agriculture and ethical trade. Millets are rich in essential macronutrients and micronutrients, including but not limited to, carbohydrates, proteins, fats, vitamins, and minerals. They also contain bioactive compounds such as phenolic acids, flavonoids, and antioxidants. The ethical dimensions of millet cultivation are emphasized, focusing on fair trade protocols that could significantly elevate the socio-economic status of marginalized farmers. Millets also hold distinct cultural and traditional relevance in various indigenous communities, thus positing a loss in millet agriculture as a loss of cultural heritage. A critical gap in current literature is identified in the domains of farming practices, climate adaptability, and socio-economic implications of millet cultivation. Although millets have been evaluated for their nutritional profile, research is scant in areas like optimal agronomic practices, the potential impact of climatic variations, and social-economic ramifications of millet-based agriculture. Future research paradigms could profitably focus on the utility of millets in managing chronic lifestyle disorders and their integrative role in sustainable agricultural frameworks.
MODEL PENJADWALAN BATCH PADA SATU MESIN YANG MENGALAMI DETERIORASI UNTUK MINIMASI TOTAL BIAYA SIMPAN DAN BIAYA KUALITAS
Authors: S. Indrapriyatna Ahmad , Suprayogi Suprayogi , P. Iskandar Bermawi , Halim A. Hakim
Published: November 2023

This research discusses batch scheduling model accommodating the condition of machine deterioration. The proposed model has changed the formulation of quality cost from that discussed in Indrapriyatna et al. (2007a), especially in the internal and external failure costs. It is assumed that the distribution of time between out-of-control conditions follows the exponential distribution. An algorithm has been proposed. This research concludes that, for continue batch size, the greater the sample size proportion of the batch size, the greater the total cost and number of batches. In addition, the greater the probability of producing nonconforming products, the greater the total cost. For any values of the probability, the number of batches will be the same, but the batch sizes are different. On the other hand, for model with discrete batch sizes, we used Indrapriyatna et al. (2007b) approach to solve the problem.

Abstract in Bahasa Indonesia:

Penelitian ini membahas model penjadwalan batch yang mengakomodasikan kondisi mesin terdeteriorasi, yang akan menyebabkan produk menjadi nonconforming. Pengembangan ini mengubah formulasi biaya kualitas yang telah dirumuskan pada model Indrapriyatna et al. (2007a), khususnya untuk Biaya Kegagalan Internal dan Biaya Kegagalan Eksternal. Dalam model usulan, waktu antar kondisi out-of-control diasumsikan berdistribusi eksponensial. Sebuah algoritma penyelesaian dirancang untuk model usulan tersebut. Studi ini menunjukkan bahwa, untuk model dengan ukuran batch kontinu, semakin besar proporsi ukuran sampel menyebabkan biaya total dan jumlah batch yang semakin besar. Selain itu, semakin besar peluang produk nonconforming dihasilkan maka akan menyebabkan semakin besar total biaya. Observasi lain menunjukkan bahwa jumlah batch selalu sama untuk sebarang nilai peluang; walaupun ukuran masing-masing batch berbeda. Pada model dengan ukuran batch diskrit digunakan 3 buah metode untuk mengubah ukuran batch menjadi integer yang diusulkan oleh Indrapriyatna et al. (2007b) dan menghasilkan kesimpulan yang sama.

Kata kunci: mesin terdeteriorasi, produk nonconforming, ukuran batch kontinu, ukuran batch diskrit.
MODEL PERENCANAAN PRODUKSI PADA RANTAI PASOK CRUDE PALM OIL DENGAN MEMPERTIMBANGKAN PREFERENSI PENGAMBIL KEPUTUSAN
Authors: Hadiguna Rika Ampuh , Machfud Machfud
Published: November 2023

A model of production planning in Crude Palm Oil industry is discussed on this paper. An interactive model is made due to the involvement of decision makerâs preference in production planning. The model is built for Nucleus-Plasma palm estate system. The sources of fresh palm fruit bunches are obtained from nucleus estate, plasma estate and outsourcing. A single objective fuzzy linear programming model is built with the following steps: (1) Decision variables, parameters are identified from the real system of Crude Palm Oil industry as well as determination of constraints and objective function; (2) Fuzzy parameters are determined using modified S curve membership function. Linear programming model is also formulated at this step. Risk quality of raw material is represented by percentage of defect raw material; (3) Model is then validated using data from Nucleus-Plasma palm estate system. The result shows that S curve membership function is able to represent the preference of decision makers.

Abstract in Bahasa Indonesia:

Tulisan ini membahas sebuah model perencanaan produksi dalam kerangka rantai pasok agroindustri crude palm oil (minyak sawit mentah). Model dibuat interaktif karena melibatkan preferensi pengambil keputusan dalam perencanaan produksi. Model dibangun pada lingkup perkebunan yang menggunakan sistem Perkebunan Inti Rakyat (PIR). Sumber pasokan tandan buah segar berasal dari kebun inti, kebun petani plasma, dan kebun luar. Konsep pemodelan yang diterapkan adalah programa linear fuzzy dengan obyektif tunggal. Model dikembangkan dalam beberapa tahapan. Pertama, mengidentifikasi variabel, parameter, kendala dan fungsi obyektif. Kedua, menetapkan parameter fuzzy dengan fungsi keanggotaan berbentuk kurva S dimodifikasi. Pada tahap ini dilakukan formulasi model dalam bentuk programa linear. Resiko kualitas yang berasal dari bahan baku direpresentasikan dalam bentuk persen jumlah cacat. Ketiga, melakukan pengujian model menggunakan data yang diadopsi dari sebuah perusahaan perkebunan yang mempunyai sistem PIR. Hasil yang diperoleh menunjukkan bahwa model mempunyai kemampuan untuk mengakomodir preferensi pengambil keputusan.

Kata kunci: rantai pasok, agroindustri, programa linear, fuzzy, kualitas, preferensi.
ALGORITMA PENENTUAN TITIK PENCEKAMAN HOLE-BASED MODULAR FIXTURE
Authors: Nudu Josef Hernawan , Toh Isa Setiasyah
Published: November 2023

This article illustrates fixturing algorithm for determining clamping point of hole-based modular fixture. The proposed algorithm is based on the algorithm developed by Ariastuti et al. The previous algorithm could be applied for determining clamping point of dedicated or slot-based modular fixture but it can not be applied directly for hole-based modular fixture. Conversion of locators’ coordinate and clamping coordinate into coincident baseplate-coordinates and an approach for modeling the magnitude and action point of equivalent forces are proposed. This algorithm is designed for fixturing prismatic workpart having machining feature(s) being processed on a vertical milling machine. The machining features are hole, blind hole, pocket, slot, blind slot, step, and blind step. Three hypothetical worksamples were analyzed using Ariastuti’s algorithm and this new algorithm. The result shows that both algorithms have the same properties in terms of feasible fixturing and unfeasible fixturing on a single setup.The new algorithm gives coordinates that coincide with holes of related baseplate in feasible fixturing. Forces equilibrium during machining is the only aspect being considered for feasibity analysis. Fixture elements’ dimension, strength, and deformation have not been considered yet.

Abstract in Bahasa Indonesia:

Makalah ini memaparkan algoritma fixturing untuk penentuan titik pencekaman fixture modular jenis hole yang dikembangan dari algoritma Ariastuti et al. Algoritma Ariastuti et al. dapat digunakan untuk menentukan titik pencekaman dedicated fixture dan modular fixture jenis slot, namun tidak dapat diterapkan secara langsung pada modular fixture jenis hole. Algoritma usulan menambahkan satu tahapan berupa penyesuaian koordinat lokator dan klem yang bersesuaian dengan posisi lubang pada plat dasar modular fixture jenis hole. Algoritma yang diusulkan berbeda dalam hal penentuan besar dan titik tangkap gaya potong ekivalen, serta penentuan titik pencekaman yang dipilih. Penelitian dibatasi pada fixturing benda kerja prismatik yang memiliki feature hole, blind hole, pocket, slot, blind slot, step, dan blind step untuk pemesinan pada mesin milling vertikal. Fisibilitas fixturing ditentukan oleh kondisi kesetimbangan gaya selama proses pemesinan. Aplikasi algoritma usulan pada tiga buah benda uji hipotetis memberikan hasil yang setara dengan algoritma Ariastuti et al.; berupa kondisi fixturing fisibel atau tidak fisibel. Hasil kondisi fixturing yang fisibel adalah titik lokator dan klem yang bersesuaian dengan posisi susunan lubang pada plat dasar fixture modular untuk pemesinan benda kerja dalam satu kali setup. Algoritma yang dikembangkan belum mempertimbangkan kendala dimensi dan kekuatan elemen fixture serta deformasi.

Kata kunci: fixture modular, fixturing, titik pencekaman
PENENTUAN URUTAN PERAKITAN PRODUK MULTIAKSIAL ORTOGONAL DENGAN MEMPERTIMBANGKAN TITIK LOKASI MATING DAN VOLUME KOMPONEN
Authors: Alfadhlani Alfadhlani , Toha Isa Setiasyah
Published: November 2023

This paper proposes the development of assembly sequence generation method for non sheet metal mechanical product which assembled by using orthogonal multi-axial orientation. The proposed method, removes exploded view generation, liaison diagram generation, manually precedence analysis and precedence relation generation step by using the main information from each steps i.e. mating, volume, and mating location point of contacted components on the final assembly. These information are used as component selection priority rule and can be extracted directly from CAD data base. Assembly sequence is generated by using 3D solid model as input in the form of stacked drawing. Feasibility of assembly sequence is performed by considering components and sub-assembly stability in assembly process, geometrical constraint, accessibility and fasteners. The proposed method is examined by using Bench Vice and provides a fisible assembly sequence as a result.

Abstract in Bahasa Indonesia:

Makalah ini menjelaskan pengembangan metode penentuan urutan perakitan produk mekanik non sheet metal dengan orientasi perakitan multiaksial ortogonal. Metode yang dikembangkan pada makalah ini menghilangkan tahapan pembentukan gambar urai, pembentukan diagram liaison, analisis preseden secara manual dan pembentukan hubungan preseden. Hal tersebut dilakukan dengan langsung menggunakan informasi utama dari setiap langkah yaitu mating, volume, dan lokasi titik mating komponen yang kontak pada perakitan akhir. Informasi tersebut digunakan sebagai kriteria aturan prioritas pemilihan komponen dan dapat diperoleh langsung dari basis data CAD. Penentuan urutan perakitan dilakukan dengan input gambar solid 3D dalam bentuk gambar tumpuk. Jaminan fisibilitas urutan perakitan yang terbentuk dilakukan dengan mempertimbangkan masalah stabilitas komponen dan sub perakitan selama proses perakitan, pembatas geometri, aksesibilitas dan pengencang. Pengujian algoritma dilakukan pada Bench Vice dan menghasilkan urutan perakitan yang fisibel.

Kata kunci: urutan perakitan, CAD, mating, pembatas preseden, kolisi, interferensi
HUBUNGAN ANTARA KNOWLEDGE SHARING CAPABILITY, ABSORPTIVE CAPACITY DAN MEKANISME FORMAL: STUDI KASUS INDUSTRI TEKNOLOGI INFORMASI DAN KOMUNIKASI DI INDONESIA
Authors: Andrawina Luciana , Govindaraju Rajesri , Samadhi TMA Ari , Sudirman Iman
Published: November 2023

Knowledge is currently viewed as an important strategic resource in companies in order to gain competitive advantage. However, the success in generating competitive advantage will depend on the company’s ability to acquire and assimilate knowledge (potential absorptive capacity) and to transform and exploit knowledge (realized absorptive capacity). This research proposed three hypotheses by processing the sampled data of 114 companies of information and communication technology industry in Indonesia. Based on the results, this study finds that knowledge sharing capability significantly influences potential absorptive capacity and the company’s ability to acquire and assimilate knowledge has a positive influence towards the company’s ability to transform and to exploit knowledge. The relationship between potential absorptive capacity and realized absorptive capacity is moderated by formal mechanism.

Abstract in Bahasa Indonesia:

Pengetahuan saat ini dipandang sebagai sumber daya strategis yang penting bagi perusahaan untuk dapat memiliki keunggulan bersaing. Kesuksesan perusahaan menghasilkan keunggulan bersaing tergantung pada kemampuan perusahaan mengakuisisi dan mengasimilasi pengetahuan (potential absorptive capacity) dan mentransformasi dan mengeksploitasi pengetahuan (realized absorptive capacity). Penelitian ini mengajukan tiga hipotesis dengan mengolah data sampel dari 114 perusahaan pada industri teknologi informasi dan komunikasi di Indonesia. Hasil penelitian menemukan bahwa knowledge sharing capability berpengaruh signifikan terhadap potential absorptive capacity, kemampuan perusahaan mengakuisisi dan mengasimilasi berpengaruh signifikan terhadap kemampuan mentransformasi dan mengeksplotasi pengetahuan. Hubungan antara potential absorptive capacity dan realized absorptive capacity dimoderasi oleh mekanisme formal.

Kata kunci: knowledge sharing capability, potential absorptive capacity, realized absorptive capacity, mekanisme formal, industri teknologi informasi dan komunikasi.
THE QUALITY IMPROVEMENT OF PRIMER PACKAGING PROCESS USING SIX SIGMA METHODOLOGY
Authors: Ditahardiyani Prima , Ratnayani Ratnayani , Angwar M.
Published: November 2023

The implementation of Six Sigma has become a common theme in many organizations. This paper presents the Six Sigma methodology and its implementation in a primer packaging process of Cranberry drink. DMAIC (Define, Measure, Analyze, Improve and Control) approach is used to analyze and to improve the primer packaging process, which have high variability and defects output. After the improvement, the results showed that there was an increasing sigma level. However, it is not significantly and has not achieved the world standard quality, yet. Therefore, the implementation of Six Sigma in primer packaging process of Cranberry drink still has a room for doing a further research.
KESEIMBANGAN LINTASAN TIPE U- LINE ASSEMBLY PADA PERAKITAN POMPA AIR
Authors: Pratikto Pratikto , Octavia Tanti
Published: November 2023

Many companies strive for minimizing imbalance work station as well as number of work stations. Besides, the work station’s precedence and space curb also have to be considered. So far, there exist many solutions on those quests. Two of those solutions are the straight line and the U-type line balancing. In this paper, we compare the straight line balancing to U-type line balancing using Mixed Integer Programming (MIP), particularly, for solving the assembly line of water pumps production. Additionally, we employed LINGO to solve the MIP model. The result shows that the U-type line gives a better solution than the straight line balancing in term of number of work station. Moreover, it also shows that U-type line balancing is more efficient than the straight line balancing, significantly.

Abstract in Bahasa Indonesia:

Saat ini, secara umum banyak perusahaan dihadapkan pada masalah meminimalkan beban kerja yang tidak seimbang dan jumlah stasiun kerja dengan batasan proses serta lokasi yang ada. Banyak penelitian yang telah dilakukan untuk menyelesaikan permasalahan di atas. Penelitian ini bertujuan untuk membandingkan keseimbangan lintasan straight line dan tipe U-line menggunakan model mixed integer programming pada suatu perakitan pompa air. Model mixed integer programming diselesaikan dengan menggunakan LINGO. Hasil penelitian menunjukkan tipe U-line memberikan hasil yang lebih baik dibandingkan straight line berdasarkan jumlah work station dan lebih efisien secara signifikan.

Kata kunci: keseimbangan lintasan, keseimbangan lintasan tipe U-line, mixed integer programming
KINERJA ECONOMIZER PADA BOILER
Authors: Akbar Muhammad Sjahid , Suryadi Fredi , Prastyo Dedy Dwi
Published: November 2023

This paper employed the dual response approach for case of Multivariate Robust Parameter Design (MRPD) which is developed by Del Castillo and Miro Quesada. MRPD method can be applied for any design of experiment. The optimization in this method uses minimizing variance function with restriction on mean function. In this paper, MRPD is applied to the case of optimization of heat transfer efectivity and operational cost at economizer. Those two responses are optimized by setting the level of control factors; diametre of tube hole, transversal spacing, and fin nearness. Temperature of feedwater is hold as a noise factor. Optimization is calculated by fmincon in MATLAB 7.0. The optimal condition for heat tranfer efectivity is 77.17% and operational cost is 30.58 kW. The optimal condition is attained at diametre of tube hole 1.5 inch, transversal spacing 3.5 inch, and fin density 3 fin/inch.

Abstract in Bahasa Indonesia:

Penelitian ini menggunakan metode pendekatan dual response terhadap kasus Multivariate Robust Parameter Design (MRPD) yang dikembangkan oleh Del Castillo dan Miro Quesada. Metode MRPD tidak mensyaratkan jenis rancangan percobaan yang dapat digunakan dalam proses optimasi, yang dilakukan dengan meminimalkan fungsi varians terhadap kendala fungsi rerata. Pada penelitian ini, metode MRPD diterapkan untuk kasus pencarian nilai optimal respon yaitu efektifitas perpindahan panas dan biaya operasi pada economizer. Optimasi kedua respon dilakukan dengan cara mengoptimalkan level faktor kontrol diameter luar tubing, transversal spacing, dan kerapatan fin. Temperatur feedwater berlaku sebagai faktor noise. Optimasi dilakukan dengan bantuan fmincon pada MATLAB 7.0 yang menghasilkan kondisi optimum untuk efektifitas perpindahan panas sebesar 77,17% dan biaya operasi sebesar 30,58 kW. Kondisi tersebut dicapai pada saat level diameter luar tubing sebesar 1,5 inci, transversal spacing sebesar 3,5 inci, dan kerapatan fin sebesar 3 fin/inci.

Kata kunci: Economizer, dual response, Multivariate Robust Parameter Design
MODEL PENJADWALAN PADA FLOWSHOP-4-STAGE DENGAN KRITERIA MINIMISASI LATENESS MAKSIMUM DAN JUMLAH TARDY JOBS
Authors: Saleh Alex , Zaini Emsosfi
Published: November 2023

This research discusses jobs scheduling model on flowshop-4-stage for fabrication and assembly processes. Each job consists of a unique component and a common component. Both the unique and common components are processed on the first three machines and assembled on the fourth machine. The unique components are processed individually, while common components are processed in batches for which respective constant setups are needed. The criteria used for the models are to minimize maximum lateness and number of tardy jobs. The development is executed to accommodate the possibility of tardy jobs. A proposed algorithm is initiated with jobs scheduling using the earliest due date (EDD) rule for the single machine, and batching process using the dynamic programming principle. Number of tardy jobs improved based on Hodgson Algorithm. The proposed algorithm is not an optimal algorithm as we can not guarantee optimal in scheduling process, nevertheless the batching method can bring out an optimal solution. This research also discusses numerical cases to show model behavior.

Abstract in Bahasa Indonesia:

Penelitian ini membahas model penjadwalan job pada flowshop-4-stage untuk proses fabrikasi dan perakitan. Setiap job terdiri dari 1 unique component dan 1 common component, yang keduanya diproses pada tiga mesin pertama secara serial dan dirakit pada mesin keempat. Unique component diproses satu per satu sedangkan common component diproses dalam batch dengan waktu setup yang konstan untuk setiap batch. Kriteria yang digunakan adalah minimisasi lateness maksimum dan jumlah tardy jobs. Pengembangan model dilakukan untuk mengakomodasi adanya job yang terlambat. Algoritma dimulai dengan proses penjadwalan job dengan menggunakan aturan earliest due date (EDD) untuk mesin tunggal, dan proses batching dengan menggunakan pemrograman dinamis. Jumlah tardy jobs diperbaiki dengan Algoritma Hodgson. Algoritma yang diusulkan bukan merupakan algoritma optimal karena proses penjadwalan yang tidak dijamin optimal, meskipun proses batching dapat menghasilkan solusi optimal. Penelitian ini dilengkapi dengan contoh numerik untuk menunjukkan perilaku model.

Kata kunci: flowshop-4-stage, unique component, common component, penjadwalan batch, lateness maksimum , jumlah tardy jobs.
TABU SEARCH SEBAGAI LOCAL SEARCH PADA ALGORITMA ANT COLONY UNTUK PENJADWALAN FLOWSHOP
Authors: Sahputra Iwan Halim , Octavia Tanti , Chandra Agus Susanto
Published: November 2023

Ant colony optimization (ACO) is one of the meta-heuristic methods developed for finding solutions to optimization problems such as scheduling. Local search method is one part of the ACO which determines the quality of the resulting solution. In this paper, Tabu Search was proposed as a method of local search in ACO to solve the problem of flowshop scheduling. The purpose of this scheduling was to minimize the makespan. Makespan and computation time of the proposed method were compared to the ACO that implemented Job-Index as local search method. Using proposed algorithm, makespan values obtained were not significantly different than solutions of ACO using Job-Index method, and had computation time shorter.

Abstract in Bahasa Indonesia:

Ant colony optimization (ACO) adalah salah satu metode meta-heuristic yang dikembangkan untuk mencari solusi bagi permasalahan optimasi seperti penjadwalan. Metode local search merupakan salah satu bagian dari ACO yang menentukan kualitas solusi yang dihasilkan. Dalam makalah ini Tabu Search diusulkan sebagai metode local search dalam algoritma ACO untuk menyelesaikan masalah penjadwalan flowshop. Tujuan dari penjadwalan ini adalah untuk meminimalkan makespan. Hasil makespan dan computation time dari metode usulan ini akan dibandingkan dengan algoritma ACO yang menggunakan Job-Index sebagai metode local search. Dengan menggunakan algoritma Tabu Search sebagai local search didapat nilai makespan yang tidak berbeda secara signifikan dibandingkan yang menggunakan metode Job-Index, dengan kelebihan computation time yang lebih singkat.

Kata kunci: Tabu Search, Ant Colony Algorithm, Local Search, Penjadwalan Flowshop.
Pemodelan Lokasi-Alokasi Terminal Bahan Baku untuk Meminimasi Total Biaya Rantai Pasok pada Industri Produk Jadi Rotan
Authors: . Yuniaristanto , Sutopo Wahyudi , Aisyati Azizah
Published: November 2023

In Surakarta and its surroundings (Solo Raya), there exists more than 400 Small-Medium Enterprises (SMEs) that produce finished products of rattan. Due to the high procurement cost as total operational cost of raw rattan distribution network from the sources, e.g. Borneo and Celebes to the rattan industries, the competitiveness of their products is lower than products from other countries. Therefore, to overcome the problem, those costs should be reduced for example by aggregating the demand of rattan industries. This police needs to be supported by the warehouse for storing and distributing raw rattan. Hence, this research aims to develop a facility location-allocation model so that total supply chain costs, including raw rattan procurement costs as well as facilities opening and closing costs can be minimized. The location-allocation model will be presented in a mixed integer non-linear programming model and solved using MS-Excel Solver. The results are number and location of the warehouse along with the raw rattan allocation in the warehouse to ensure raw rattan supply for rattan industries.
Disaster Management in Indonesia: Logistical Coordination and Cooperation to Create Effective Relief Operations
Authors: Rossum Joost van , Krukkert René
Published: November 2023

Indonesia has in the past often been struck by natural disasters. After these disasters, the disaster relief operations turned out to be ineffective in most cases. This study focuses on the main problems in disaster relief operations in Indonesia and tries to deliver a general model to deal with those. Literature studies showed that the main problem occurred in the field of organization, communication and logistical processes. Literature studies on relief operations in other countries showed that cooperation with private parties can be effective in these operations. The result of this study is a model which handles with the main problems and has the potential to create effective disaster relief operations.
Perbandingan Kombinasi Genetic Algorithm – Simulated Annealing dengan Particle Swarm Optimization pada Permasalahan Tata Letak Fasilitas
Authors: Setiawan Isabella Leo , Palit Herry Christian
Published: November 2023

This article aims to compare the performance of combination of Genetic Algorithm-Simulated Annealing (GA-SA) with Particle Swarm Optimization (PSO) to solve facility layout problem. GA-SA in this article consist of two algorithms, GA-SA I and GA-SA II, with a different mutation rule. PSO uses fuzzy particle swarm concept to represent solution from each particle. Two criteria to analyze all algorithms performance are moment of movement and computational time. Experiments show that GA-SA II has the best performance in minimization both criteria
Optimisasi Portofolio Mean-VaR di bawah CAPM Transformasi Koyck dengan Volatilitas Tak Konstan dan Efek Long Memory
Authors: Sukono Sukono , Subanar Subanar , Rosadi Dedy
Published: November 2023

In this paper we formulated mean-VaR portfolio optimization through CAPM Koyck transformation. We assumed that lagged of risk premium which have highly influence on stock returns is infinite, while model parameters decrease geometrically. We also assumed that rate of return in risk premium market index is not constant, in other word has a non-constant volatility rate, and also has a long memory effect. The later was analyzed using ARFIMA. Non constant volatility rate was modeled via GARCH model. The portfolio optimization was constructed using Langrangian multiplier and the Kuhn-Tucker theorem was employed to obtain the solution by the least square method. Finally, we provide a numerical example of the optimization model based on several stocks traded in Indonesian capital market.
PERBANDINGAN METODE JUNBIKI KANBAN CYCLIC DITINJAU DARI JIT DAN SUMBER DAYA Studi Kasus pada Perusahaan Otomotif
Authors: Eri Ignatius , J. Kristina Helena
Published: November 2023

The research has done at an automotive company. The intention of this research are to knowing the effect and also the advantages and disadvantages of Junbiki Method which is a new method in this company in increasing JIT(Just in Time), use of resources, and make comparison between Junbiki method and Kanban System. The research is done by comparing the Kanban system with the Junbiki method on the parts i.e. seat part and door trim. The measured variables are those in the period of September as the basic period, continued with the periods of October, November, and December 2004. The productivities to be observed are those of energy and labor consumption. The research proves that the Junbiki method is better than the Kanban system. It is shown from the increase of JIT performance during four periods at the average of 73% and least of resources. By using the Junbiki method, the wastage in the use of energy, labor, movement, and process can be eliminated.

Abstract in Bahasa Indonesia :

Penelitian ini dilakukan pada perusahaan yang bergerak di bidang otomotif. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh serta kelemahan dan kelebihan metode Junbiki yang merupakan metode baru yang diterapkan perusahaan terhadap peningkatan JIT (Just in Time) dan penggunaan sumber daya, dan membuat perbandingan antara metode Junbiki dan sistem Kanban. Penelitian ini dilakukan dengan membandingkan sistem Kanban dengan metode Junbiki pada part yang memenuhi syarat, yaitu part seat dan door trim. Variable yang diukur adalah pada periode September sebagai periode dasar, dilanjutkan dengan periode Oktober, November, dan Desember 2004. Pemakaian sumber daya yang ingin diteliti adalah pemakaian energi dan tenaga kerja. Hasil penelitian membuktikan bahwa metode Junbiki lebih baik daripada sistem Kanban. Hal ini terlihat dari peningkatan perfoma JIT selama empat periode rata-rata sebesar 73% dan kebutuhan sumber daya yang lebih sedikit. Dengan metode Junbiki, pemborosan dalam pemakaian energi, tenaga kerja, gerakan, dan proses dapat dihilangkan.

Kata kunci: Junbiki, Kanban, JIT, Sumber Daya.
THE ROLE OF STEP-NC IN IMPROVING THE PERFORMANCE OF SUPPLY CHAIN
Authors: Suteja The Jaya
Published: November 2023

The success of supply chain implementation in producing manufactured product heavily relies on the development of CAD system, CAM system, and CNC machine tool. However, current CAD system, CAM system, and CNC machine tool have some weaknesses in supporting supply chain implementation. This paper presents an overview of STEP-NC and its role in supply chain of manufactured product. STEP-NC is a new interface standard for CAD-CAM-CNC chain, which is developed by International Standards Organization (ISO) to extend STEP model data to define data for NC machine tools. By using STEP-NC, the link of all information in supply chain of manufactured product will be more flexible, faster, easier, safer, and more reliable.