3,246 research outputs found
Order batching in multi-server pick-and-sort warehouses.
No full textIn many warehouses, customer orders are batched to profit from a reduction in the order picking effort. This reduction has to be offset against an increase in sorting effort. This paper studies the impact of the order batching policy on average customer order throughput time, in warehouses where the picking and sorting functions are executed separately by either a single operator or multiple parallel operators. We present a throughput time estimation model based on Whitt's queuing network approach, assuming that the number of order lines per customer order follows a discrete probability distribution and that the warehouse uses a random storage strategy. We show that the model is adequate in approximating the optimal pick batch size, minimizing average customer order throughput time. Next, we use the model to explore the different factors influencing optimal batch size, the optimal allocation of workers to picking and sorting, and the impact of different order picking strategies such as sort-while-pick (SWP) versus pick-and-sort (PAS)Order batching; Order picking and sorting; Queueing; Warehousing;
Simple rules to modify pre-planned paths and improve gross robot motions associated with pick & place assembly tasks
No full textPurposeThis paper aims to describe real time improvements to the performance and trajectories of robots for which paths had already been planned by some means, automatic or otherwise. The techniques are applied to industrial robots during the gross motions associated with pick and place tasks. Simple rules for path improvement are described.Design/methodology/approachThe dynamics of the manipulator in closed form Lagrange equations are used to represent the dynamics by a set of second‐order coupled non‐linear differential equations. The form of these equations is exploited in an attempt to establish some simple rules. Sub‐optimal paths are improved by considering simple rules developed from the model of the machinery dynamics. By considering the physical limitations of the manipulator, performance was improved by refining pre‐calculated paths. Experiments were performed with a prototype robot and an old Puma 560 robot in a laboratory environment. Once the method had been tested successfully then experiments were conducted with a Kuka KR125 Robot at Ford Motor Company. The measured quantities for all the robots were drive currents to the motors (which represented the torques) and the joint angular positions.FindingsThe method of path refinement presented in this paper uses a simplified model of the robot dynamics to successfully improve the gross motions associated with a pick and place task. The advantage of using the input‐output form described was that intermediate non‐linearities (such as gear friction) and the motor characteristics were directly incorporated into the model.Research limitations/implicationsEven though many of the theoretical problems in manipulator dynamics have been solved, the question of how to best apply the theories to industrial manipulators is still being debated. In the work presented in this paper, information on system dynamics is used to produce simple rules for “path improvement”.Practical implicationsMost fast algorithms are for mobile robots and algorithms are scarcer for manipulators with revolute joints (the most popular type of industrial robot). This work presents real time methods that allow the robot to continue working while new global paths are automatically planned and improved as necessary.Originality/valueMotion planning for manipulators with many degrees of freedom is a complex task and research in this area has been mostly restricted to static environments, offline simulation or virtual environments. This research is applied in real time to industrial robots with revolute joints.</jats:sec
Integration of vestibular and proprioceptive signals for spatial updating
No full textFrissen I, Campos JL, Souman JL, Ernst MO. Integration of vestibular and proprioceptive signals for spatial updating. Experimental Brain Research. 2011;212(2):163-176.Spatial updating during self-motion typically involves the appropriate integration of both visual and non-visual cues, including vestibular and proprioceptive information. Here, we investigated how human observers combine these two non-visual cues during full-stride curvilinear walking. To obtain a continuous, real-time estimate of perceived position, observers were asked to continuously point toward a previously viewed target in the absence of vision. They did so while moving on a large circular treadmill under various movement conditions. Two conditions were designed to evaluate spatial updating when information was largely limited to either proprioceptive information (walking in place) or vestibular information (passive movement). A third condition evaluated updating when both sources of information were available (walking through space) and were either congruent or in conflict. During both the passive movement condition and while walking through space, the pattern of pointing behavior demonstrated evidence of accurate egocentric updating. In contrast, when walking in place, perceived self-motion was underestimated and participants always adjusted the pointer at a constant rate, irrespective of changes in the rate at which the participant moved relative to the target. The results are discussed in relation to the maximum likelihood estimation model of sensory integration. They show that when the two cues were congruent, estimates were combined, such that the variance of the adjustments was generally reduced. Results also suggest that when conflicts were introduced between the vestibular and proprioceptive cues, spatial updating was based on a weighted average of the two inputs
Fundamental social motives measured across forty-two cultures in two waves
No full textPick C. M., Ko A, Kenrick DT, Wiezel A, Wormley AS, Awad E, Al-Shawaf L, Barry O, Bereby-Meyer Y, Boonyasiriwat W, Brandstatter E, Ceylan-Batur S, Choy BKC, Crispim AC, Cruz JE, David D, David OA, Defelipe RP, Elmas P, Espinosa A, Fernandez AM, Fetvadjiev VH, Fetvadjieva S, Fischer R, Galdi S, Galindo-Caballero OJ, Golovina EV, Golovina GM, Gomez-Jacinto L, Graf S, Grossmann I, Gul P, Halama P, Hamamura T, Han SH, Hansson LS, Hitokoto H, Hrebickova M, Ilic D, Johnson JL, Kara-Yakoubian M, Karl JA, Kim JP, Kohut M, Lasselin J, Lee H, Li NP, Mafra AL, Malanchuk O, Moran S, Murata A, Na J, Ndiaye SAL, Jiaqing O, Onyishi IE, Pasay-an E, Rizwan M, Roth E, Salgado S, Samoylenko ES, Savchenko TN, Sette C, Sevincer AT, Skoog E, Stanciu A, Suh EM, Sznycer D, Talhelm T, Ugwu FO, Uskul AK, Uz I, Valentova JV, Varella MAC, Wei LQ, Zambrano D, Varnum MEW</p
Functional MRI reveals expert-novice differences during sport-related anticipation
No full textWe examined the effect of expertise on cortical activation during sports anticipation using functional MRI. In experiment 1, recreational players predicted badminton stroke direction and the pattern of active clusters was consistent with a proposed perception-of-action network. This pattern was not replicated in a stimulus-matched, action-unrelated control task. In experiment 2, players of three different skill levels anticipated stroke direction from clips occluded either 160 ms before or 80 ms after racquet-shuttle contact. Early-occluded sequences produced more activation than late-occluded sequences overall, in most cortical regions of interest, but experts showed an additional enhancement in medial, dorsolateral and ventrolateral frontal cortex. Anticipation in open-skill sports engages cortical areas integral to observing and understanding others' actions; such activity is enhanced in experts
Mekanisme Petunjuk Teknis Operasional (PTO) Cash Pick Up Nasabah Eksisting Warung Mikro pada PT. Bank Syariah Mandiri Kantor Cabang Pembantu Jantho
No full textPT. Bank Syariah Mandiri (BSM) Kantor Cabang Pembantu Jantho yang beralamat di JL. Jend. Sudirman, Jantho, Aceh Besar, yang mulai diresmikan pada juli 2010. Selama melakukan kerja praktik penulis mengamati berlangsungnya pelayanan yang diberikan oleh setiap karyawan kepada nasabah khususnya pada bagian pembiayaan Warung Mikro. Salah satu layanan yang diberikan untuk memudahkan nasabah pembiayaan mikro adalah Cash pick up yang merupakan layanan pengambilan atau penjemputan uang tunai dari lokasi nasabah untuk setoran angsuran pembiayaan mikro. Dengan adanyalayanan ini maka dapat mempermudah dan mempercepat proses setoran angsuran dari hasil lokasipenjualan nasabah. Adapun tujuan dari penulisan Laporan Kerja Praktik (LKP) ini adalah untuk mengetahui bagaimana mekanisme Petunjuk Teknis Operasional cash pick up nasabah eksisiting warung mikro. Dalam memberikan proses layanan cash pick up petugas yang ditunjuk untuk melakukan kegiatan cash pick up harus mengikuti Standar Prosedur Bisnis di Pembiayaan Mikro yang dilakukan dalam lima tahap. Pertamapetugas yang ditunjuk harusmempersiapkan daftar jatuh tempo angsuran dan jadwal pick up harian. Kedua menghubungi nasabah via telepon atau smssebelum jatuh tempo. Ketiga Frekuensi cash pick up disesuaikan dengan kondisi lapangan. Keempat pengawasan oleh MBM dan Branch Manager. Terakhir menuliskan laporan pada kartuCollection nasabah dan papan produktivitas Collection. Dikarenakan banyaknya masyarakatyang tidak mengetahui adanya layananini.Makadiharapkan PT. BSM untuk lebih giat dalam mensosialisasikan tentang adanya kehadiranlayanancash pick up pada pembiayaan Warung Mikro
Interactive effects of yolk testosterone and carotenoid on prenatal growth and offspring physiology in a precocial bird
No full textThis is the author accepted manuscript. The final version is available from OUP via the DOI in this record.Conditions experienced by individuals during prenatal development can have long-term effects on their phenotype. Maternally transmitted resources are important mediators of such prenatal effects, but the potential interactive effects among them in shaping offspring phenotype have never been studied. Maternally derived testosterone is known to stimulate growth, but these benefits may be counterbalanced by an increase in the production of reactive oxygen species (ROS). Maternally transmitted carotenoids might have the capacity to scavenge ROS and thereby buffer an increase in oxidative stress caused by prenatal exposure to high testosterone levels. Here, we experimentally tested for such interactive effects between maternal yolk testosterone and carotenoid in Japanese quail (Coturnix japonica). We found that hatching mass was reduced and reactive oxygen metabolites (ROMs) levels at the end of the period of maximal growth increased in chicks from eggs injected with either testosterone or carotenoid (only a tendency in chicks from testosterone-injected eggs). However, when both egg compounds were manipulated simultaneously, hatching mass and ROM levels were not affected, showing that both carotenoid and testosterone lose their detrimental effects when the ratio between the 2 compounds is balanced. Our study provides the first experimental evidence for interactive effects of 2 maternally derived egg compounds on offspring phenotype and suggests that developmental cues are tightly coadjusted within an egg.This work was supported by the Swiss National Science Foundation (PP00P3_128386 and PP00P3_157455) and the Fonds zur Förderung des akademischen Nachwuchses (FAN)
Reflections of a Jewish, Lesbian Author
No full textIn this essay, Jewish lesbian author Leslea Newman speaks of the importance of finding one's own identity reflected in works of literature, citing examples of her own work, and recommending the writings of other Jewish lesbian authors of merit
PERAN TELLER PICK UP TABUNGAN KURBAN PADA PT. BANK PERKREDITAN RAKYAT BUMI RIAU INSANI KAMPAR DALAM MENINGKATKAN JUMLAH NASABAH MENURUT PERSPEKTIF EKONOMI SYARIAH
No full textSkripsi ini dilatar belakangi oleh pemasaran yang meningkat tetapi kurang
signifikan yang dilakukan karyawan Teller Pick Up Tabungan Kurban PT. Bank
Perkreditan Rakyat Bumi Riau Insani Kampar dalam meningkatkan jumlah
nasabah Menurut Perspektif Ekonomi Syariah.
Penelelitian ini dilakukan di PT. Bank Perkreditan Rakyat Bumi Riau
Insani Jl. Pasir Putih No. 12 E kampar. Rumusan masalah dalam penelitian ini
yaitu: (1). peran Teller Pick Up Tabungan Kurban dalam meningkatkan jumlah
nasabah? (2). Faktor-faktor Pendukung dan Penghambat Peran Teller Pick Up
Tabungan Kurban dalam meningkatkan jumlah nasabah? (3). Perspektif Ekonomi
Syariah tentang Peran Teller Pick Up dalam meningkatkan jumlah nasabah?.
Tujuan Penelitian ini yaitu: (1). Untuk mengetahui peran Teller Pick Up
Tabungan Kurban dalam meningkatkan jumlah nasabah. (2). Untuk mengetahui
faktor-faktor Pendukung dan Penghambat Peran Teller Pick Up Tabungan Kurban
dalam meningkatkan jumlah nasabah. (3). Untuk mengetahui Perspektif Ekonomi
Syariah tentang Peran Teller Pick Up Tabungan Kurban dalam meningkatkan
jumlah nasabah.
Penelitian ini merupakan penelitian kualititatif. Populasi dalam penelitian
ini adalah 1 pimpinan, 2 Teller Pick Up dan 25 orang nasabah. Metode
pengambilan sampel pimpinan dan Teller Pick Up yaitu total sampling.
Sedangkan untuk nasabah yaitu purposive sampling. Teknik pengumpulan data
yaitu observasi, wawancara dan konsioner.
Hasil dalam penelitian menunjukkan peran Teller Pick Up tabungan
kurban dalam meningkatkan jumlah nasabah sangat berperan. Faktor-faktor
pendukung dalam pemasarannya yaitu Internal: pengalaman kerja dan motivasi
diri sendiri. Sedangkan Eksternal: media sosial dan Adanya kerjasama antar
karyawan. Adapun faktor penghambat dalam pemasaran yaitu, Internal:
kemampuan komunikasi kurang dan waktu terbatas. Sedangkan eksternal: sarana
dan prasarana, cuaca yang berubah-ubah dan pesaing lain. Adapun Perspektif
Ekonomi Syariah tentang Peran Teller Pick Up Tabungan Kurban pada Bank
Perkreditan Rakyat Bumi Riau Insani Kampar dalam meningkatkan jumlah
nasabah telah menerapkan beberapa prinsip ekonomi syariah
A trade-off between reproductive investment and maternal cerebellum size in a precocial bird
No full textThis is the author accepted manuscript. The final version is available from the Royal Society via the DOI in this record.Natural selection favours increased investment in reproduction, yet considerable variation in parental investment is observed in natural populations. Life-history theory predicts that this variation is maintained by a trade-off between the benefits of increased reproductive investment and its associated costs for the parents. The nature of these costs of reproduction, however, remains poorly understood. The brain is an energetically highly expensive organ and increased reproductive investment may, therefore, negatively affect brain maintenance. Using artificial selection lines for high and low prenatal maternal investment in a precocial bird, the Japanese quail (Coturnix japonica), we provide experimental evidence for this hypothesis by showing that increased prenatal provisioning negatively affects the size of a particular brain region of the mother, the cerebellum. Our finding suggests that cognitive demands may constrain the evolution of parental investment, and vice versa, contributing to the maintenance of variation in reproductive behaviour in animal populations.This work was supported by the Swiss National Science Foundation (PP00P3_128386, PP00P3_157455 to B.T.) and the Georges und Antoine Claraz-Schenkung (to C.E.)
- …
