• 전자공학회논문지A
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• 제33A권11호
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• pp.1-9
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• 1996

In the following paper, new architectural algorithm of clock and data recovery circuit is proposed for 622.08 Mbps optical communication receiver. New algorithm makes use of charge pump PLL using voltage controlled ring oscillator and extracts 8-channel 77.76 MHz clock signals, which are delayed by i/8 (i=1,2, ...8), to convert and recover 8-channel parallel data from 662.08 Mbps MRZ serial data. This circuit includes clock genration block to produce clock signals continuously even if input data doesn't exist. And synchronization of data and clock is doen by the method which compares 1/2 bit delayed onput data and decided dta by extracted clock signals. Thus, we can stabilize frequency and phase of clock signal even if input data is distorted or doesn't exist and simplify receiver architecture compared to traditional receiver's. Also it is possible ot realize clock extraction, data decision and conversion simulataneously. Verification of this algorithm is executed by DESIGN CENTER (version 6.1) using test models which are modelized by analog behavior modeling and digital circuit model, modified to process input frequency sufficiently, in SPICE.

• The Journal of Asian Finance, Economics and Business
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• 제7권5호
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• pp.205-216
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• 2020

This study seeks to empirically analyze the effects of core self-evaluation and adaptive selling behavior on sales performance for female salespersons engaged in door-to-door sales through the face-to-face channel in the wellness industry. This study seeks to examine the importance of adaptive selling, through, salespeople derive appropriate strategies in response to market changes. For female salespeople who use face-to-face channels, this study empirically investigated the relationship between core self-evaluation and adaptive selling, and effects on sales performance. A 31-item survey was constructed, based on prior research. We selected six door-to-door sales companies in South Korea and conducted one-to-one interviews with female salespeople in the Seoul metropolitan area and analyzed 208 pieces of significant data. Results demonstrated that among the core self-evaluation factors for female salespeople, self-esteem, self-efficacy, and neuroticism had an effect on adaptive selling factors, while locus of control did not. These factors were found to affect sales performance through the mediating role of adaptive selling. Improvements in the adaptive selling capabilities of female salespeople in charge of face-to-face channels positively affected sales performance. Management efforts are required to enhance self-esteem, self-efficacy, or neuroticism. These results suggest that companies should support enhancing individual adaptive selling capabilities of their salespeople.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2012년도 춘계학술발표대회
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• pp.67.1-67.1
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• 2012

Graphene has attracted much attention for future nanoelectronics due to its superior electrical properties. Owing to its extremely high carrier mobility and controllable carrier density, graphene is a promising material for practical applications, particularly as a channel layer of high-speed FET. Furthermore, the planar form of graphene is compatible with the conventional top-down CMOS fabrication processes and large-scale synthesis by chemical vapor deposition (CVD) process is also feasible. Despite these promising characteristics of graphene, much work must still be done in order to successfully develop graphene FET. One of the key issues is the process technique for gate dielectric formation because the channel mobility of graphene FET is drastically affected by the gate dielectric interface quality. Formation of high quality gate dielectric on graphene is still a challenging. Dirac voltage, the charge neutral point of the device, also strongly depends on gate dielectrics. Another performance killer in graphene FET is source/drain contact resistance, as the contact resistant between metal and graphene S/D is usually one order of magnitude higher than that between metal and silicon S/D. In this presentation, the key issues on graphene-based FET, including organic-inorganic hybrid gate dielectric formation, controlling of Dirac voltage, reduction of source/drain contact resistance, device structure optimization, graphene gate electrode for improvement of gate dielectric reliability, and CVD graphene transfer process issues are addressed.

• 한국재료학회지
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• 제24권3호
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• pp.140-144
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• 2014

The contact mechanism of devices is usually researched at electrode contacts. However, the contact between a dielectric and channel at the MOS structure is more important. The graphene was used as a channel material, and the thin film transistor with MOS structure was prepared to observe the contact mechanism. The graphene was obtained on Cu foil by the thermal decomposition method with $H_2$ and $CH_4$ mixed gases at an ambient annealing temperature of $1000^{\circ}C$ during the deposition for 30 min, and was then transferred onto a $SiO_2/Si$ substrate. The graphene was doped in a nitrogen acidic solution. The chemical properties of graphene were investigated to research the effect of nitric atoms doping. The sheet resistance of graphene decreased after nitrogen acidic doping, and the sheet resistance decreased with an increase in the doping times because of the increment of negative charge carriers. The nitric-atom-doped graphene showed the Ohmic contact at the curve of the drain current and drain voltage, in spite of the Schottky contact of grapnene without doping.

• 대한안전경영과학회지
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• 제4권1호
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• pp.105-114
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• 2002

Nowadays, most companies seek after the greatest profit by means of offering the goods which consumers want timely and efficiently and minimizing the cost of inventory and distribution channel which amounts to the great portion of total cost. And according as EC(Electronic Commerce) market has increased rapidly, SCM(Supply Chain Management) for EC become one of the most important facts for companies, therefore this paper suggest SCM scheme which EC, especially B to C, is added to the existing commerce system. This paper uses internet for information integration of distribution channel which is away from one another and applies TOC(Theory of Constraint)'s DBR(Drum-Buffer-Rope) Scheduling for synchronization through the whole supply chain. It is possible to synchronize the whole supply chain by means of making the speed of manufacturing and distribution to be controlled by consumer's order which is received in distribution center, and inventory and loss of sales opportunities are minimized by constant. Buffer Management. If inventories in distribution center is short, then it needs to search CCR(Capacity Constraint Resource) in supply chain and to control the speed of manufacturing and distribution according to the ability of CCR. This paper applies PT(Partial Transshipment) strategy for Delivery from distribution center to store or cyber consumer. the strategy this paper suggests chooses neighbour area from area which each distribution center takes charge, and then makes product ordered by cyber consumer which lives in the chosen area to be delivered according to inventory of distribution center.

• Journal of Plant Biotechnology
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• 제37권4호
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• pp.539-548
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• 2010

Potassium ($K^+$) is one of the most abundant cations in higher plant. It comprises about 10% of plant dry weight and it plays roles in numerous functions such as osmo- and turgor regulation, charge balance of plasma membrane and control of stomata and organ movement. Several potassium transporters and potassium channels regulate $K^+$ homeostasis in response to $K^+$ uptake systems. In this review, we describe the biological, biochemical and physiological characteristics of shaker like potassium channels in higher plant. Especially, we searched the rice genome databases and analysized expressed genes, genome structures and protein domain characteristics of shaker like potassium channels.

• 한국전기전자재료학회논문지
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• 제34권2호
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• pp.99-104
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• 2021

Ion-beam sputtering (IBS) was used to deposit semiconducting IZTO (indium zinc tin oxide) thin films onto heavily-doped Si substrates using a sintered ceramic target with the nominal composition In0.4Zn0.5Sn0.1O1.5, which could work as a channel layer for oxide TFT (oxide thin film transistor) devices. The crystallization behavior and electrical properties were examined for the films in terms of deposition parameters, i.e. target tilt angle and substrate temperature during deposition. The thickness uniformity of the films were examined using a stylus profilometer. The observed difference in electrical properties was not related to the degree of crystallization but to the deposition temperature which affected charge carrier concentration (n), electrical resistivity (ρ), sheet resistance (Rs), and Hall mobility (μH) values of the films.

• 한국전자통신학회논문지
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• 제18권3호
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• pp.405-412
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• 2023

드론 및 ICT 융합 기술의 발전에 따라 기존 잠수사가 담당하고 있던 수중 현황 탐색, 수중 구조물 검사 등의 작업을 수중 드론으로 대체하고 낚시를 위한 수중 탐사 등의 레저용 수중 드론, 다리 교각 등 산업용 등의 수중 드론의 활용성이 증대되고 있다. 기존 모터 컨트롤러는 항공 드론에 적합하며 수중 드론 전용 BLDC 모터 컨트롤러의 개발을 통해 수중 드론의 완성도와 모터 컨트롤에 대한 신뢰도를 높일 수 있다. 수중 드론 전용 배터리 관리 시스템(BMS)의 개발을 통해 충전 상태 확인, 방전 상태 확인, 셀 밸런싱 조정, 고전압 보호 기능 구현으로 배터리 안정성을 확보하였다.

• 산학경영연구
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• 제15권
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• pp.25-45
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• 2002

여행도매업체는 시장개방, 경쟁기업의 출현, 개인소득의 증가로 인한 소비자 욕구의 다양한 등 환경의 급속한 변화로 소매여행업체와의 관계에 있어 보다 효율적인 마케팅전략 수립이 요구되고 있다. 따라서 여행도매업체의 여행소매업체에 대한 관계적 특성요인을 확인하고, 관계형성요인간의 관계성을 연구함으로써 여행업계에서 현실적으로 적용할 수 있는 관계마케팅 차원의 접근이 필요하다. 본 연구는 여행업의 유통경로상에서 여행도매업체의 여행소매업체에 대한 관계적 특성요인들이 신뢰, 몰입, 그리고 재구매의도에 어떠한 영향을 주는지를 규명하고 개선방향을 제시하기 위하여 실증적 분석을 하였다. 본 연구는 여행도매업체의 여행소매업체에 대한 관계성에 초점을 맞춘 것으로 변수간의 관계를 분석하기 위해 연구모형과 가설을 설정한 후 검증하였다. 분석결과 전반적인 연구모형에 대한 적합도는 설정기준 이상으로 나와 가설검증을 실시하였다. 연구결과는 첫째, 여행도매업체의 최고경영자나 마케터들에게 여행소매업체와의 관계에서 현장에서 적용할 수 있는 효율적인 마케팅전략 방안을 구체적으로 제시해 주고, 둘째, 여행도매업체는 여행소매업자로부터 신뢰구축을 통하여 장기적인 교환관계유지와 같은 관계지향적인 방법으로 여행소매업체를 관리해야 한다는 시사점을 제시하고 있다.

• 접착 및 계면
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• 제24권2호
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• pp.64-68
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• 2023

유기 전계효과 트랜지스터(OFETs)는 유기 반도체를 채널층으로 하여 유연한 기판에서 제작할 수 있어 차세대 전자 소자 분야에서 각광받고 있다. 특히 diketopyrrolopyrrole (DPP) 계열 고분자 반도체는 다른 유기 반도체에 비하여 전하 이동도가 높아 활발하게 활용되고 있지만 여전히 무기 반도체에 비하여 낮아, 유기반도체의 전하 이동도를 향상시키기 위한 여러 연구가 진행되고 있다. 본 연구에서는 절연체와 고분자 반도체사이에 자가 조립 단층 박막을 형성하여 표면 에너지를 제어함으로써 고분자 반도체의 결정성을 향상시키고자 하였다. 이를 통해 고분자 박막의 결정성을 성공적으로 제어할 수 있었고, 유기 반도체의 전하 이동도를 3.57×10^-3 cm²V^-1s^-1에서 5.12×10^-2 cm²V^-1s^-1로 약 14배 향상시킬 수 있었다.