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2. Queueing models analysis on system efficiency, utilization and queue length with simulation approach.

Author

Hasugian, Ivo Andika, Supranata, Davin, Christopher, and Chris, Arnold Benedict

Subjects
SERVICE industries, ECONOMIC competition, CONSUMERS, CASHIERS, SIMULATION methods & models
Abstract

Business competition in the service sector in Indonesia makes the queuing model very important. This paper aims to find the optimal queuing model at the XYZ counter area service. The average customer arrival time in the ongoing XYZ model simulation with only one entry is 34.1 seconds. With three queue lines and three cashiers each accommodated with ten samples, the duration of service for each cashier independently is 61.4 seconds, 53.2 seconds, and 68.4 seconds. The number of customers served is 4 out of 16. This fact shows that this queue is not adequate for optimal service. The researchers made two simulation models for counter row reduction in this study. First, the researcher made two entries, four queue lines, and four counters. The number of customers served is 24 out of 67, which makes the first model has an effectiveness of 35.82%, which is more advanced than the effectiveness of the current model. Second, the researcher makes one entry, one queue line1, and one counter1. The number of customers served was 5 out of 16, making the alternative model 31.25% effective, which is also ahead of the current model. [ABSTRACT FROM AUTHOR]

Published
2023
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5. Regulation of Multicolor Fluorescence Changes Found in Donor‐acceptor‐type Mechanochromic Fluorescent Dyes.

Author

Ishi‐i, Tsutomu, Tanaka, Honoka, Kichise, Rihoko, Davin, Christopher, Matsuda, Takaaki, Aizawa, Naoya, Park, In Seob, Yasuda, Takuma, and Matsumoto, Taisuke

Subjects
FLUORESCENCE, FLUORESCENT dyes, POLAR effects (Chemistry), METHOXY group, FUNCTIONAL groups
Abstract

The regulation of multicolor fluorescence changes in mechanochromic fluorescence (MCF) remains a challenging task. Herein, we report the regulation of MCF using a donor‐acceptor structure. Two crystal polymorphs, BTD‐pCHO(O) and BTD‐pCHO(R) produced by the introduction of formyl groups to an MCF dye, respond to a mechanical stimulus, allowing a three‐color fluorescence change. Specifically, the orange‐colored fluorescence of the metastable BTD‐pCHO(O) polymorph changed to a deep‐red color in the amorphous‐like state to finally give a red color in the stable BTD‐pCHO(R) polymorph. This change occurred by mechanical grinding followed by vapor fuming. The two different crystal packing patterns were selectively regulated by the electronic effect of the introduced functional groups. The two types of selectively formed crystals in BTD(F)‐pCHO bearing fluorine atoms, and BTD(OMe)‐pCHO bearing methoxy groups, respond to mechanical grinding, allowing for the regulation of multicolor MCL from a three‐color change to two different types of two‐color changes. [ABSTRACT FROM AUTHOR]

Published
2021
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7. Regulation of Multicolor Fluorescence Changes Found in Donor-acceptor-type Mechanochromic Fluorescent Dyes.

Author

Ishi-I T, Tanaka H, Kichise R, Davin C, Matsuda T, Aizawa N, Park IS, Yasuda T, and Matsumoto T

Subjects
Molecular Structure, Color, Fluorescence, Fluorescent Dyes chemistry
Abstract

The regulation of multicolor fluorescence changes in mechanochromic fluorescence (MCF) remains a challenging task. Herein, we report the regulation of MCF using a donor-acceptor structure. Two crystal polymorphs, BTD-pCHO(O) and BTD-pCHO(R) produced by the introduction of formyl groups to an MCF dye, respond to a mechanical stimulus, allowing a three-color fluorescence change. Specifically, the orange-colored fluorescence of the metastable BTD-pCHO(O) polymorph changed to a deep-red color in the amorphous-like state to finally give a red color in the stable BTD-pCHO(R) polymorph. This change occurred by mechanical grinding followed by vapor fuming. The two different crystal packing patterns were selectively regulated by the electronic effect of the introduced functional groups. The two types of selectively formed crystals in BTD(F)-pCHO bearing fluorine atoms, and BTD(OMe)-pCHO bearing methoxy groups, respond to mechanical grinding, allowing for the regulation of multicolor MCL from a three-color change to two different types of two-color changes., (© 2021 Wiley-VCH GmbH.)

Published
2021
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