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    Wyświetlanie 1-11 z 11
    Tytuł:
    Some Rotation Patterns in Two-Phase Sampling
    Autorzy:
    Singh, G. N.
    Prasad, Shakti
    Powiązania:
    https://bibliotekanauki.pl/articles/465915.pdf
    Data publikacji:
    2011
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    Two-phase, successive sampling
    auxiliary information
    chain-type
    bias
    mean square error
    optimum replacement policy
    Opis:
    A problem related to the estimation of population mean on the current occasion using two-phase successive (rotation) sampling on two occasions has been considered. Two-phase ratio, regression and chain-type estimators for estimating the population mean on current (second) occasion have been proposed. Properties of the proposed estimators have been studied and their respective optimum replacement policies are discussed. Estimators are compared with the sample mean estimator, when there is no matching and the natural optimum estimator, which is a linear combination of the means of the matched and unmatched portions of the sample on the current occasion. Results are demonstrated through empirical means of comparison and suitable recommendations are made.
    Źródło:
    Statistics in Transition new series; 2011, 12, 1; 25-44
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Missing data estimation based on the chaining technique in survey sampling
    Autorzy:
    Singh Thakur, Narendra
    Shukla, Diwakar
    Powiązania:
    https://bibliotekanauki.pl/articles/2156986.pdf
    Data publikacji:
    2022-12-15
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    estimation
    missing data
    chaining
    imputation
    bias
    mean squared error (MSE)
    factor type (F-T)
    chain type estimator
    double sampling
    Opis:
    Sample surveys are often affected by missing observations and non-response caused by the respondents' refusal or unwillingness to provide the requested information or due to their memory failure. In order to substitute the missing data, a procedure called imputation is applied, which uses the available data as a tool for the replacement of the missing values. Two auxiliary variables create a chain which is used to substitute the missing part of the sample. The aim of the paper is to present the application of the Chain-type factor estimator as a means of source imputation for the non-response units in an incomplete sample. The proposed strategies were found to be more efficient and bias-controllable than similar estimation procedures described in the relevant literature. These techniques could also be made nearly unbiased in relation to other selected parametric values. The findings are supported by a numerical study involving the use of a dataset, proving that the proposed techniques outperform other similar ones.
    Źródło:
    Statistics in Transition new series; 2022, 23, 4; 91-111
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chain Ratio Estimator for the Population Mean in the Presence of Non-Response
    Autorzy:
    Khare, B. B.
    Srivastava, U.
    Kumar, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/465661.pdf
    Data publikacji:
    2012
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    chain ratio type estimator
    preliminary sample
    bias
    mean square error
    non-response
    additional auxiliary variable
    Opis:
    In this paper we have proposed two chain ratio type estimators for population mean using two auxiliary variables in the presence of non-response. The proposed estimators have been found to be more efficient than the relevant estimators for the fixed values of preliminary sample of size n′and subsample of size n(
    Źródło:
    Statistics in Transition new series; 2012, 13, 3; 495-518
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of Supply Chain Network to Reduce Impacts of Damages during Shipping
    Autorzy:
    Abushaega, Mastoor M.
    Daehy, Yahya H.
    Alghamdi, Saleh Y.
    Krishnan, Krishna K.
    Khamaj, Abdulrahman
    Powiązania:
    https://bibliotekanauki.pl/articles/1841416.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    supply chain network
    damage recovery scenarios
    closed loop supply chain
    type I errors
    type II errors
    Opis:
    Recently, the expand of industrial market has led to have long supply chain network. During the long shipment, the probability of having damaged products is likely to occur. The probability of having damaged products is different between stages and that could lead to higher percentage of damaged products when arrived at retailers. Many companies have rejected the entire shipment because the damaged product percentage was higher than that agreed on. Decision-makers have tried to reduce the percentage of damaged products that happened because the transit, loading unloading the shipment, and natural disasters. Companies started to implement recovery centers in the supply chain network in order to return their system steady statues. Recovery models have been developed in this paper to reduce the damaged percentage at minimum costs to do so. Results show that the possibility of implementing an inspection unit and a recovery centers in the system before sending the entire shipment to the retailer based on examining a sample size that has been selected randomly from the shipment and the minimum cost of committing type I and type II errors. Designing a methodology to minimize the total cost associated with the supply chain system when there is a possibility of damage occurring during shipping is the objective of this research.
    Źródło:
    Management and Production Engineering Review; 2021, 12, 2; 17-26
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A collaborative strategy for a three echelon supply chain with ramp type demand, deterioration and inflation
    Autorzy:
    Singh, N.
    Vaish, B.
    Singh, S. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/406653.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    three echelon supply chain
    ramp type demand
    deterioration
    backlogging
    inflation
    Opis:
    A supply chain system has been investigated in which a single manufacturer procures raw materials from a single supplier, processes them to produce finished products, and then delivers the products to a single retailer. The customer’s demand rate is assumed to be time-sensitive in nature (ramp type) that allows two-phase variation in the demand and production rate. Our adoption of ramp type demand reflects a real market demand for a newly launched product. Shortages are allowed with partial backlogging of demand (only for the retailer), i.e. the rest represent lost sales. The effects of inflation of the cost parameters and deterioration are also considered separately. We show that the total cost function is convex. Using this convexity, a simple algorithm is presented to determine the optimal order quantity and optimal cycle time for the total cost function. The results are discussed with numerical examples and particular cases of the model discussed briefly. A sensitivity analysis of the optimal solution with respect to the parameters of the system is carried out.
    Źródło:
    Operations Research and Decisions; 2014, 24, 3; 78-100
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Type IV resistant starch increases cecum short chain fatty acids level in rats
    Autorzy:
    Le Thanh-Blicharz, Joanna
    Anioła, Jacek
    Kowalczewski, Przemysław
    Przygoński, Krzysztof
    Zaborowska, Zofia
    Lewandowicz, Grażyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1039344.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    type IV resistant starch
    digestibility
    rats
    short chain fatty acids
    prebiotic
    Opis:
    Resistant starches are type of dietary fibers. However, their physiological effects depend on the way they resist digestion in the gastrointestinal tract. The objective of this study was to examine the hypothesis that new type of RS4 preparations, of in vitro digestibility of about 50%, obtained by cross-linking and acetylation, acts as a prebiotic by increasing short chain fatty acids content in cecum digesta. The rats were fed with diet containing pregelatinized, cross-linked and acetylated starches as a main carbohydrate source. Pregelatinized, but not chemically modified, potato starch was used in the composition of the control diet. After two weeks of experiment the increase of short chain fatty acids contents in ceceum digesta was observed. The intake of starch A, cross-linked only with adipic acid, resulted in increase of about 40% of short chain fatty acids content, whereas starch PA cross-linked with sodium trimetaphosphate and adipic acid of about 50%. The utmost twofold increase was observed in the case of the production of propionic acid. In contrast, the content of butyric acid increased (12%) only as an effect of consumption of starch PA and even decreased (about 30%) in case of starch A. Both RS4 starches caused an increase of the production of acetic acid by more than 40%. No changes in serum biochemistry, liver cholesterol and organ weights of rats were stated.
    Źródło:
    Acta Biochimica Polonica; 2014, 61, 1; 109-114
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heavy subgraph pairs for traceability of block-chains
    Autorzy:
    Li, Binlong
    Broersma, Hajo
    Zhang, Shenggui
    Powiązania:
    https://bibliotekanauki.pl/articles/30148234.pdf
    Data publikacji:
    2014-05-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    block-chain traceable graph
    Ore-type condition
    forbidden subgrap
    $o_{−1}$-heavy subgraph
    Opis:
    A graph is called traceable if it contains a Hamilton path, i.e., a path containing all its vertices. Let G be a graph on n vertices. We say that an induced subgraph of G is $o_{−1}$-heavy if it contains two nonadjacent vertices which satisfy an Ore-type degree condition for traceability, i.e., with degree sum at least $n−1$ in $G$. A block-chain is a graph whose block graph is a path, i.e., it is either a $P_1$, $P_2$, or a 2-connected graph, or a graph with at least one cut vertex and exactly two end-blocks. Obviously, every traceable graph is a block-chain, but the reverse does not hold. In this paper we characterize all the pairs of connected $o_{−1}$-heavy graphs that guarantee traceability of block-chains. Our main result is a common extension of earlier work on degree sum conditions, forbidden subgraph conditions and heavy subgraph conditions for traceability
    Źródło:
    Discussiones Mathematicae Graph Theory; 2014, 34, 2; 287-307
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some evidence for skewed mating type distribution in Iranian populations of Rhynchosporium commune, the cause of barley scald disease
    Autorzy:
    Arzanlou, M.
    Karimi, K.
    Mirabi, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/66749.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mating type
    distribution
    Rhynchosporium commune
    barley
    scald disease
    foliar disease
    scald
    multiplex polymerase chain reaction
    Opis:
    Rhynchosporium commune (formerly known as Rhynchosporium secalis), the causal agent of scald disease on barley, is known to spread asexually by splash dispersed conidia. However, there are multiple lines of evidence for the possibility of a clandestine sexual cycle occurrence in this species including extensive genotypic diversity, equal distribution of mating type alleles across the world and expression of mating type genes. In the current study, the potential for the occurrence of a sexual cycle amongst the Iranian population of R. commune was assessed by analyzing distribution and frequency of the mating type alleles at both micro and macrospatial scales. A total of 95 single-conidial R. commune isolates were obtained from different barley fields in Kurdistan province. Previously designed primers were applied in a multiplex PCR assay to study distribution and frequency of the mating type alleles within and between populations. Totally, 67 isolates were determined as MAT1-1 and the remaining 28 isolates as MAT1-2 throughout the sampling counties. The results obtained at a macro-spatial scale revealed that unlike Kamyaran county (both MAT1-1 and MAT1-2 at an equal ratio), an unequal distribution of mating type genes was dominant among R. commune isolates in both Mariwan and Dehgolan counties. Our findings support a predominantly asexual reproduction for Mariwan and Dehgolan counties and the possibility of sexual stage occurrence in Kamyarna county.
    Źródło:
    Journal of Plant Protection Research; 2016, 56, 3
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the impact of lubricant type on selected operational parameters of a chainsaw used in beech timber cutting
    Autorzy:
    Stawicki, T.
    Sedlak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/52526.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    environment contamination
    risk
    lubricant type
    operational parameter
    petrol chain saw
    beech timber
    cutting
    oil consumption
    fuel consumption
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2016, 59, 196
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Causative chaindifference for each type of accidents in Japanese Maritime Traffic Systems (MTS)
    Autorzy:
    Mutmainnah, W.
    Bowo, L. P.
    Sulistiyono, A. B.
    Furusho, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/117583.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    maritime traffic
    vessel traffic service (VTS)
    Maritime Traffic Systems (MTS)
    Japanese Maritime Traffic Systems (MTS)
    Causative Chain (CC)
    type of accidents
    maritime accidents
    Japan Transportation Safety Board (JTSB)
    Opis:
    Causative chain (CC) is a failure chain that cause accident as an outcome product of the second step of MOP model, namely line relation analysis (LRA). This CC is a connection of several causative factors (CF), an outcome product of first step of MOP model, namely corner analysis (CA). MOP Model is an abbreviation from 4M Overturned Pyramid, created by authors by combining 2 accident analysis models. There are two steps in this model, namely CA and LRA. Utilizing this model can know what is CF that happen dominantly to the accidents and what is a danger CC that characterize accidents in a certain place and certain period. By knowing the characteristics, the preventive action can be decided to decrease the number of accident in the next period. The aim of this paper is providing the development of MOP Model that has been upgraded and understanding the characteristics of each type accident. The data that is analyzed in this paper is Japanese accidents from 2008 until 2013, which is available on Japan Transportation Safety Board (JTSB)’s website. The analysis shows that every type of accidents has a unique characteristic, shown by their CFs and CCs. However, Man Factor is still playing role to the system dominantly.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 489-494
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of Agricultural Type Coconut Climbing and Plucking Robot
    Projekt wspinającego się po drzewach robota rolniczego do zrywania orzechów kokosowych
    Autorzy:
    Karakkattu Sivanandan, Sharath Kumar
    Rzymkowski, Cezary
    Powiązania:
    https://bibliotekanauki.pl/articles/274729.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    agricultural type robot
    serial chain robot
    climbing robot
    plucking robot
    kinematic analysis
    FEM analysis
    robot do zastosowań rolniczych
    robot szeregowy
    robot wspinający się
    zrywanie kokosów
    analiza kinematyczna
    analiza MES
    Opis:
    The conventional method of coconut plucking followed in coconut farms is arduous as well as a perilous job. There are abounding cases of trauma in which most of them has ended up in the death. Here comes the significant demand for a robot to do this task which would be decisive in mitigating the perils and to meet the everlasting demand of coconut. The foremost intention of the project was to design a climber with a 5 DoF serial chain robot (plucker), which together is supposed to do the coconut climbing and plucking task and also should be available to the farmers at an affordable cost. In the current version, the robot is expected to work complying the commands given by the farmer from the ground who can see the bunch of coconuts through the eyes of robot (cameras) as the robot is not shrewd enough to identify which drupe is ready to be plucked or not. For being cost effective, and light weight, the entire robot skeleton is structured in aluminium alloy with the minimum feasible dimensions of its size and the motor drive selection is also given imperative consideration.
    Konwencjonalna metoda zrywania orzechów stosowana na uprawach kokosów jest męcząca i ryzykowna. Często dochodzi do wypadków prowadzących nawet do śmierci. Pojawia się zatem istotna potrzeba zastąpienia pracy ludzkiej przez odpowiednio skonstruowane roboty - pozwoli to na rozwiązanie problemów związanych z zagrożeniami, przy zapewnieniu poziomu produkcji odpowiadającego ciągłemu popytowi na orzechy kokosowe. Głównym celem pracy było opracowanie projektu robota modułowego - mobilnej wspinającej się po pniu platformy transportującej część wykonawczą (robota o pięciu stopniach swobody), której zadaniem jest odcinanie kiści orzechów. Robot powinien być możliwie tani, aby był dostępny dla szerokiej grupy rolników. W wersji, będącej przedmiotem pracy, robot będzie pracował pod nadzorem rolnika pozostającego na ziemi, który będzie decydował, na podstawie obserwacji wizualnej przekazywanej przez kamerę zainstalowaną na końcówce robota, które orzechy nadają się do zerwania. Dla zapewnienia niskiego kosztu i małej masy, szkielet robota jest zbudowany ze stopu aluminium o minimalnych możliwych wymiarach zapewniających jednak odpowiednią sztywność i wytrzymałość. Podobne warunki wzięto pod uwagę przy wyborze silników.
    Źródło:
    Pomiary Automatyka Robotyka; 2020, 24, 2; 23-29
    1427-9126
    Pojawia się w:
    Pomiary Automatyka Robotyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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