http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Kenji OHNO,Hiroki MATSUMOTO,Kenji MURAO 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
As the chip integration advances toward the CMOS VLSI integrated systems, on-chip Digital-to-Analog Converter (DAC) becomes more important building blocks. Key technologies in DAC is fabrication at low-cost and operation on high-performance. Highresolution and Low-Voltage DAC is required in many fields. Their advantage extends to mixed-signal systems where both frequency higher, the device shrinks into deep sub-micrometer. However the shrinking device dimensions also imply proportional scalling of power supply voltage. Advantages of alogorithmic DAC using Switched-Capacitor (SC) are suitable to the above requirement. SC operates on small chip area, low consumption of electoric power, and is compatible to MOS IC. To operate under low supply voltage, terminal of NMOS analog switch should connect to ground or virtual ground.[1] However, major performance of conventional algolithmic DAC is limited by offset voltage and spike.[2] In this paper, they shows two Low-Voltage SC cyclic DACs. They are proposed which consists of a switch, capacitor, MOSFET and operational amplifier (op-amp). Circuit operation is evaluated on SIMetrix.
Spike-compensated Low-Voltage Unity-Gain-Reset Switched-Capacitor Cyclic Digital-to-Analog Converter
Kenji OHNO,HirokiMATSUMOTO,Kenji MURAO 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
As the chip integration advances toward the CMOS VLSI integrated systems, on-chip Digital-to-Analog Converter (DAC) becomes more important building blocks. Key technologies in DAC is fabrication at low-cost and operation on high-performance. Highresolution and Low-Voltage DAC is required in many fields. Their advantage extends to mixed-signal systems where both frequency higher, the device shrinks into deep sub-micrometer. However the shrinking device dimensions also imply proportional scalling of power supply voltage. Advantages of Alogorithmic DAC using Switched-Capacitor (SC) are suitable to the above requirement. SC are small chip area, low consumption of electoric power, and compatibility to MOS IC. To operate under low supply voltage, terminal of NMOS analog switch should connect to ground or virtual ground. However, major performance of conventional algolithmic DAC is limited by offset voltage and spike. In this paper, it shows a Low-Voltage SC cyclic DAC. It is proposed which consists of a switch, capacitor, MOSFET and op-amp. Circuit operation is evaluated on SIMetrix.
A preliminary study on the behavior of E. coli under the natural environment-Chase by image analyzer
Kenji Kato 江原大學校 附設 環境硏究所 1992 環境硏究 Vol.9 No.-
To evaluate the viability of bacteria is important in understanding their behavior under the natural environment. Particularly, it is essential in chasing the fate of deliberately released GEMs. I propose a new method to evaluate the viability of bacteria from the measurement of cellular parameters of RNA and DNA contents using an image analyzer. Conventional plate count technique showed that the number of culturable E. coli decreased quickly when they were moved from culture to river water. Direct count showed the total number did not decreased, although image analysis revealed that a major part of the constituents turned to be in the resting phase in river water. This suggests that culturable bacteria by plate count does not represent the viability of the examined bacteria.
OPTIMAL TIMING FOR POSTING A DIRECT PRICE UNDER CHANNEL CONFLICT
Kenji Matsui 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.7
Multichannel sales strategies are now very popular owing to the prevalence of the Internet, which makes it much easier for manufacturers to engage in direct sales. Because direct channels, including catalogs and the Internet, compete against, substitute for, or complement conventional retail channels, finding the best way to utilize them in conjunction with retail channels continues to be a challenge for many firms. Specifically, multiple channels give rise to channel conflict when the channels compete for almost the same market with substitutable products. To avoid this channel conflict, some manufacturers, such as Daimler, Nikon, and Rubbermaid, have used the Internet as a medium to provide information about their products and/or to point users of the Internet to the nearest retailer carrying the product, but without offering the product for sale directly over the Internet. Dell, which is arguably the most successful Internet marketer in the personal computer market, opened kiosk locations in shopping malls across the US from 2002, and has operated full-scale manufacturer-owned stores since late 2006. However, in 2008, Dell shut down all of its kiosks in the US and instead expanded into retail stores, such as Wal-Mart and Best Buy. Furthermore, IBM redirects orders taken at ibm.com to its distributors in an attempt to mitigate the conflict, and HP gives their intermediaries a commission fee for orders placed online. In the context of multichannel management, the question of to what degree a manufacturer should set a direct price to coordinate all channels has commanded significant attention from both academic and practical viewpoints. However, marketing research addressing when a manufacturer should determine the direct price is missing from the existing literature, although it is a critical practical issue for manufacturers that adopt a multichannel sales strategy. Given the current status of the literature, this paper investigates the optimal timing of pricing by a manufacturer managing two types of marketing channel, a retail channel and a direct channel, using a dynamic noncooperative game framework. Traditionally, analytical marketing models describing channel conflict between these two channels examine price competition where the retail and direct prices are established simultaneously. In contrast to this conventional approach, our model demonstrates that such a simultaneous price competition never arises if the manufacturer and retailer can choose not only the level of price, but also the timing of pricing. If the manufacturer has sold products wholesale to a retailer presuming that the manufacturer will set the direct price before the retailer prices, the retailer accelerates the timing of retail pricing prior to the direct price setting by the manufacturer. Our findings suggest that the manufacturer should post the direct price before or upon, but not after, selling products wholesale to a retailer. Such upfront posting of the direct price not only constitutes the unique subgame perfect Nash equilibrium (SPNE) of the noncooperative game between channel members, but also maximizes profits for the manufacturer. The logic behind this outcome is as follows. If the manufacturer determines the Despite the significant amount of marketing research on multichannel management, an overview of the literature suggests that research incorporating the choice of optimal pricing timing into channel operation issues is completely lacking, despite the fact that the timing for posting the direct price is a crucial problem for manufacturers. That is, the existing marketing literature treats the order of moves of channel members as exogenously given, which is rather surprising because each member is expected to maximize its own profits in the context of a standard price-setting game. From a multichannel management perspective, this paper addresses the issue of the endogenous order of moves by adopting the established observable delay game framework (e.g., Hamilton and Slutsky 1990). Therefore, it is worth noting that the present paper is the first to introduce the idea of endogenous choice of decision timing in the field of marketing research. Our findings imply that the addition of a direct channel and the posting of a direct price after the sale of a substantial number of products through a traditional retail channel-a common multichannel strategy in practice-is inferior from the viewpoint of overall profit maximization. If a manufacturer employs such a strategy, it fails to coordinate the marketing channels and to maximize the channel profits. Indeed, as noted at the beginning of this section, many dominant manufacturers in various industries have withdrawn their direct channels. Our model effectively explains such real cases, providing useful managerial insights for business practitioners.
Kenji Fujisaki 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10
The mean global surface temperatures have increased since the late 19th century by approximately 0.3-0.6 o C (IPCC, 2007). The linear warming trend over the last 50 years is nearly double that of the last 100 years. The impact of climate warming on insects was studied using the southern green stink bug Nezara viridula as a model insect. This bug is known as a cosmopolitan agricultural pest that damages diverse crop plants worldwide. Effects of climate warming on insects include distribution, abundance, phenology, voltinism, physiology, behaviour, and community structure. It should be noted here that climate warming affects insects not only directly but also indirectly through interaction of species in ecosystem. 1. Northward range expansion of N. viridula in Japan. Past and current limits of the distribution range of N. viridula were compared (Tougou et al., 2009). It was found that the climate warming promoted northward range expansion of N. viridula by providing favourable overwintering conditions close to the specie’s range limit. The past and the current limits of the distribution range of N. viridula in central Japan were investigated. In the early 1960s, the northern limit of the species’ range was in Wakayama Prefecture and was limited by a +5 o C isothermal line for the mean January temperature. Forty five years later (2006–2007), a new survey in Wakayama and five neighbouring prefectures demonstrated that this northern limit shifted northward by 85km, at a rate of 19.0km/decade. The shift northward was likely promoted by milder winter conditions. The mean January–February temperature in the region was 1.03–1.91ºC higher in 1998–2007 than in 1960–1969. In the 1960s, the mean January temperature exceeded +5 ºC only in Wakayama city, but by now it has surpassed +5 ºC in Osaka and Tsu cities, located further north (52 and 59 km respectively), which corresponds to the current distribution of N. viridula. The number of cold days (with mean temperature below +5ºC) also significantly decreased, while the annual lowest temperature significantly increased. N. viridula was found mostly at or close to those locations where (1) the mean January temperature exceeded +5ºC, (2) the mean number of cold days did not exceed 26 during January–February, and (3) where the mean annual lowest temperature did not drop below –3.0 ºC. The general linear model shows that the mean January temperature and number of cold days are the most important factors controlling the northern limit of distribution of N. viridula. All the climatic data suggest that over the last 45 years environmental conditions have become more favourable for overwintering of N.viridula at many locations in central Japan. This has likely promoted the northward spread of the species, representing the direct response of the species to climate warming. A sympatrically distributed congeneric N. antennata is responding to the warming by retreat from the ocean coast towards cooler elevated habitats, which might be a complex response to elevated temperature and interspecific mating with N. viridula. This range expansion of N. viridula is now accelerating the extinction of N. antennata by the infertile interspecific copulation. 2. Ecophysiological responses of N. viridula to simulated warming. The effect of simulated climate change on N. viridula was studied close to the species’ northern range limit in Japan (Musolin et al., 2010). Insects from the same egg masses were reared for 15 months in 10 consecutive series under quasi-natural (i.e. outdoor) conditions and in a transparent incubator, in which climate warming was simulated by adding 2.5ºC to the outdoor temperature. The warming strongly affected all life-history and phenological parameters. In the spring, the simulated warming advanced the timing of body colour changes and post-diapause reproduction. In the early summer, it increased egg production and accelerated nymphal development. In the late summer (the hottest season), the effect of the simulated warming was strongly deleterious: nymphs developed slowly, suffered higher mortality and had difficulties during final moulting; the emerged females were smaller, some exhibited abnormal cuticle, produced fewer eggs and had a decreased life span. Our current studies are going to clarify that such an adverse effect of high temperature is caused by the decrease in bacterial symbiont which is harboured in the midgut of stink bugs. As in many phytophagous heteropteran species, N. viridula possesses a number of sac-like outgrowths, called crypts, in a posterior section of the midgut, wherein a specific bacterial symbiont is harbored. In previous studies on N. viridula from Hawaiian populations, experimental elimination of the symbiont caused little fitness defects in the host insect (Prado, et.al., 2006, Prado et al., 2009). N. viridula from Japanese populations consistently harbor the same gammaproteobacterial gut symbiont. However, in this case, contrary to the previous works, experimental sterilization of the symbiont resulted in severe nymphal mortality, indicating an obligate host-symbiont relationship (Tada et al., 2011). Considering the worldwide host-symbiont association and those experimental data, N. viridula is considered to be generally and obligatorily associated with the gut symbiont, while the symbiont effect on the host performance may be different among geographic populations. In the autumn, the warming accelerated nymphal development, resulted in larger female size, affected the timing of the diapause-associated adult body colour change from green to russet and enhanced preparation for overwintering. Larger females had higher winter survival rate than smaller females. The warming strongly increased survival rate in both size classes and allowed smaller females to reach the same winter survival rate as larger females had under the quasi-natural conditions. The winter survival also differed between the green and dark-coloured females under the quasi-natural, but not under the warming conditions. However, under the warming conditions, green females survived the winter even better than dark-coloured females did under the quasi-natural conditions. Moreover, the warming shortened the life span of females from the summer generations and prolonged it in those from the autumn generation. It is concluded that even a moderate temperature increase (+2.5 ºC) in the future is likely to have a complex influence upon insects, strongly affecting many of their life-history and phenological parameters.