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An Optimal Ordering policy on Both Way Substitutable Two-Commodity Inventory Control System
Tanaka, Masatoshi,Yoshikawa, Shin-ichi,Tabata, Yoshio Korean Institute of Industrial Engineers 2005 Industrial Engineeering & Management Systems Vol.4 No.2
There are a lot of raw materials, work-in-processes and finished goods in manufacturing industry. Here, the less stock of materials and work-in-processes manufacturing industry has, the worse the rate of the production is. Inversely, the more manufacturing industry has, the more expensive the cost to support them is. Thus, it is important for us to balance them efficiently. In general, inventory problems are to decide appropriate times to produce goods and to determine appropriate quantities of goods. Therefore, inventory problems require as more useful information as possible. For example, there are demand, lead time, ordering point and so on. In this paper, we deal with an optimal ordering policy on both way substitutable two-commodity inventory control system. That is, there is a problem of how to allocate the produced two kinds of goods in a factory to m areas so as to minimize the total expected inventory cost. The demand of each area is probabilistic, and we adopt the exponential distribution as a probability density function of demand. Moreover, we provide numerical examples of the problem.
Masatoshi Uno,Koji Tanaka 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Series-connected energy storage modules such as supercapacitors (SCs) and lithium-ion batteries cause module voltage imbalances that lead to premature deterioration of modules. Various equalization techniques have been proposed for series-connected energy storage cells/modules to alleviate such voltage imbalances. However, since the conventional topologies consist of numerous switches, sensors, inductors, or transformers, their circuit size, complexity, and costs are prone to increase in proportion to the number of series connections. This paper proposes a single-switch single-inductor equalization charger using a voltage multiplier. Because the proposed equalization charger requires only a single switch and a single inductor to operate, the circuit size and complexity can be dramatically reduced compared to that of conventional topologies. An experimental charge test was performed for series-connected SC modules with the proposed equalization charger to demonstrate its performance. Initially imbalanced voltages of the SC modules were equalized and charged to a uniform voltage level by the proposed equalization charger.
Factors Associated with Early Hospital Arrival in Patients with Acute Ischemic Stroke
Song, Dongbeom,Tanaka, Eijirou,Lee, Kijeong,Sato, Shoichiro,Koga, Masatoshi,Kim, Young Dae,Nagatsuka, Kazuyuki,Toyoda, Kazunori,Heo, Ji Hoe Korean Stroke Society 2015 Journal of stroke Vol.17 No.2
<P><B>Background and Purpose</B></P><P>Factors associated with early arrival may vary according to the characteristics of the hospital. We investigated the factors associated with early hospital arrival in two different stroke centers located in Korea and Japan.</P><P><B>Methods</B></P><P>Consecutive patients with ischemic stroke arrived hospital within 48 hours of onset between January 2011 and December 2012 were identified and the clinical and time variables were retrieved from the prospective stroke registries of Severance Hospital of Yonsei University Health System (YUHS; Seoul, Korea) and National Cerebral and Cardiovascular Center (NCVC; Osaka, Japan). Subjects were dichotomized into early (time from onset to arrival ≤4.5 hours) and late (>4.5 hours) arrival groups. Univariate and multivariate analyses were performed to evaluate factors associated with early hospital arrival.</P><P><B>Results</B></P><P>A total of 1,966 subjects (992 from YUHS; 974 from NCVC) were included in this study. The median time from onset to arrival was 6.1 hours [interquartile range, 1.7-17.8 hours]. In multivariate analysis, the factors associated with early arrival were atrial fibrillation (Odds ratio [OR], 1.505; 95% confidence interval [CI], [1.168-1.939]), higher initial National Institute of Health Stroke Scale scores (OR, 1.037; 95% CI [1.023-1.051]), onset during daytime (OR, 2.799; 95% CI [2.173-3.605]), and transport by an emergency medical service (OR, 2.127; 95% CI [1.700-2.661]). These factors were consistently associated with early arrival in both hospitals.</P><P><B>Conclusions</B></P><P>Despite differences between the hospitals, there were common factors related to early arrival. Efforts to identify and modify these factors may promote early hospital arrival and improve stroke outcome.</P>
Ishimura, Shota,Kim, Byung Gon,Tanaka, Kazuki,Nishimura, Kosuke,Kim, Hoon,Chung, Yun C.,Suzuki, Masatoshi IEEE 2018 IEEE photonics journal Vol.10 No.1
<P>We demonstrate a broadband and long-distance intermediate frequency-over-fiber (IFoF) transmission scheme employing a transmitter composed of parallel intensity/phase (IM/PM) modulators with appropriate bandwidth allocations to IM and PM. Due to the proposed scheme, we can eliminate all the null frequencies caused by dispersion-induced RF power fading, which, in turn, enables us to significantly increase the available bandwidth. In addition, our system does not require any synchronization between IM and PM, which reduces complexity compared to conventional parallel transmitter architecture. We successfully transmitted 20 <TEX>$\times$</TEX> 360 MHz filtered orthogonal-frequency-division-multiplexed signals corresponding to a common public radio interface equivalent data rate of 524.28 Gbps over a 30- and 40-km single-mode fiber satisfying the 8% threshold for the error-vector magnitude values for all the subcarriers. These results show that our proposed IFoF transmission scheme is scalable to long-distance mobile fronthaul links for 5G and beyond.</P>