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Optimal Ordering and Pricing on Clearance Goods
Koichi Nakade,Ken Ikeuchi 대한산업공학회 2015 대한산업공학회 추계학술대회논문집 Vol.2015 No.11
In a food or convenience store, goods such as meals and fresh foods must be sold within a few days. In this case, some goods are sold as clearance goods with a discounted price. In this study, a basic model with fixed order is investigated where new and clearance goods are sold at the same time. First, the optimal ordering model is formulated when the discount price and selection probabilities are given. Next the optimal ordering and pricing model is formulated in the case that the discount retail price for clearance goods can be selected by a retailer and the amount of demand and selection probabilities depend on the discount price. The optimal number of order and an optimal discount price are discussed through numerical experiments.
A Lentinula edodes Lcc1 influences hyphal morphology
Keiko Nakade,Yuichi Sakamoto 한국버섯학회 2010 한국버섯학회지 Vol.8 No.4
Laccase (Lcc; EC 1.10.3.2) belongs to a group of polyphenol oxidases, which catalyzed the oxidation of single-electron from phenolic substrates or aromatic amines. Many organisms possess several lcc encoding genes, and their biological functions diverge into many branches. There are many studies on biochemical function of Lccs, however, there are few studies about biological functions of one Lcc in detail. We researched on biological function of Lcc1, which is most abundantly secreted enzyme from vegetative mycelia into liquid culture in L. edodes. In our previous study, lcc1 gene was down regulated by RNAi method in L. edodes, and then ivrL1#32 was selected as a completely lcc1 dowaregulated transformant. We revealed that fruiting body development in ivrL1#32 was significantly suppressed compared to wild type strain. In this study, we observed the hyphal morphology of ivrL1#32. IvrL1#32 did not form thick aerial mycelium mat when grown on MYPG agar plate. From the observation using scanning electron microscope (SEM), hyphae of ivrL1#32 had many abnormal short branches and their mycelial density was lower than that of wild type strain. From transmission electron microscope observation (TEM), ivrL1#32 lacked obviously distinguishable outer and inner layer in their cell wall. In addition, the fibrous layer of ivrL1#32, which connected hyphae, obviously decreased. These morphological phenotypes would be caused by the absence of Lcc1 in L. edodes. Our results provide a clue to resolve of the biological function of Lcc1 in L. edodes.
Pre-positioning of Emergency Relief Supplies under Facility Disruptions
Prudensy Febreine Opit,Koichi Nakade 대한산업공학회 2015 대한산업공학회 추계학술대회논문집 Vol.2015 No.11
In the event of an earthquake, the disruption of one or more facilities (distribution centers) that located in certain disaster areas may be unavoidable. This paper proposes a stock prepositioning model under facility disruptions that considers multi-items, multi-vehicles, and multi-periods. All potential disruptions scenarios of distribution center(s) that located in one or more disaster areas are also considered in this model. We solve our model using two stages: stage I is to minimize the lower bound of the proportion of unsatisfied relief demand, while stage II is to maximize the proportion of relief demand satisfied by each distribution center for all potential disruption scenarios. Stage II is determined by inputting the optimum results of stage I. We formulate the mathematical model as a mixed-integer programming model. This proposed model is applied to Indonesia, an earthquake-prone country with 34 disaster areas and 16 temporary distribution centers.
Gaurav Singh,Priya G. Nakade,Dorothy Chetia,Preeti Jha,Ujjal Mondal,Saroj Kumari,Sujit Sen 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
Hydrogen sulphide (H2S) removal and its efficient utilization is a big challenge for many petroleumrefinery industries now-a-days. The present investigation involves absorption of H2S in aqueousmethyldiethanolamine (MDEA) followed by sulphidation of benzyl chloride (BC) by H2S-rich MDEA toyield dibenzyl sulphide (DBS) selectively using tetrabutylphosphonium bromide (TBPB) as a phasetransfer catalyst. Ninety per cent selectivity of DBS was obtained at some level of process condition. Asuitable mechanism has been proposed. An empirical kinetic model was also developed and correlatedwith experimental data. The present work has a potential to be used as an alternative to Claus process.
Enzymes involved in fruiting body senescence in L. edodes.
Yuichi Sakamoto,Keiko Nakade,Naotake Konno 한국버섯학회 2010 한국버섯학회지 Vol.8 No.4
Lentinula edodes (shiitake mushroom) is a very popular edible, cultivated mushroom in Japan. There are post-storage problems with shiitake mushrooms, such as gill browning and cell wall lysis of the fruiting body, which can result in loss of fresh food quality and consequent loss of value. Lentinan is a cell wall component of beta-1, 3-linked-D-glucan with beta-1, 6 branches, which was isolated as an anti-tumor active-substance from L. edodes. Lentinan content decreases following harvest as a result of increased glucanase activity. We isolated one exo-glucanase encoding genes, exg21) and two endo-glucanase encoding gene tlg12) and glu1 from L. edodes. Transcription level of the exg2, tlg1 and glu1 gene increased after harvesting. Enzymes encoded by the genes have lentinan degrading activity, therefore, these genes are involved in lentinan degradation after harvesting. We also identified several cell wall degradation- related enzyme-encoding genes3), such as mixed-linked glucanase (mlg1), chitinases (chi1, chi29), chitin deacetylase (chd1), and chitosanase (cho1). It is revealed that transcriptional levels of these genes increased after harvesting, by real-time PCR. Glucanase and chitinase activity increased following harvest as results of increased transcription of these cell wall degradation-related enzyme-encoding genes. Increase of these cell wall degradation- related enzyme activities would cause cell wall lysis and lentinan degradation during post-harvest preservation. We identified laccase and tyrosinase encoding genes (lcc4 and tyr, respectively) by PCR-subtraction. The lcc4 was a novel laccase-encoding gene in L. edodes. Transcription levels of lcc4 and tyr increased after harvesting, and these genes would be involved in browning of the fruiting body. 1) Sakamoto et al. (2005) Current Genetics, 48: 195-203 2) Sakamoto et al. (2006) Plant Physiology 141: 793-801 3) Sakamoto et al. (2009) Current Genetics 55: 409-423
Kawahara, S.,Ahhmed, A.M.,Ohta, K.,Nakade, K.,Muguruma, M. Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.8
This research investigated variation in the improvement of the texture of chicken and pork sausages induced by microbial transglutaminase (MTG). The extractability of myofibrillar proteins from these sausages as well as the ${\varepsilon}-({\gamma}-glutamyl)$lysine (G-L) content were also investigated. MTG treatment of sausages significantly increased the breaking strength values in both meat types, especially for samples incubated at $40^{\circ}C$. However, values of the breaking strength in both meat types were increased differently. The variation in protein extractability of samples incubated at $40^{\circ}C$ for both meat types could lead to some consideration of the mechanisms and the high accessions of myosin heavy chain (MHC) to MTG. SDS-PAGE analysis showed significant changes in the density of the bands after adding MTG, especially for the pork samples in which the bands disappeared totally. The G-L content in the presence of MTG was double that in control samples of both meat types. This study suggests that the binding ability of myofibrillar proteins with MTG is strong. This leads us to suggest that MTG functions positively with different improvements in the texture of chicken and pork products that are treated mechanically, such as sausages. Variability in gel improvement level between chicken and pork sausages was observed; this resulted from the variation in meat proteins in response to MTG, as well as to the original glutamyl and lysine content.