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Digital Controller Candidate for Point-of-load Synchronous Buck Converter in Tri-mode Mechanism

  • Xiu, Li-Mei;Zhang, Wei-Ping;Li, Bo;Liu, Yuan-Sheng
    • Journal of Power Electronics
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    • v.14 no.4
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    • pp.796-805
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    • 2014
  • A digital controller with a low-power approach for point-of-load synchronous buck converters is discussed and compared with its analog counterpart to confirm its feasibility for system integration. The tri-mode digital controller IC in 0.35μm CMOS process is presented to demonstrate solutions that include a PID, quarter PID, and robust RST compensators. These compensators address the steady-state, stand-by, and transient modes according to the system operating point. An idle-tone free condition for ΣΔ DPWM reduces the inherent tone noise under DC-excitation. Compared with that of the traditional approach, this condition generates a quasi-pure modulation signal. Experimental results verify the closed-loop performances and confirm the power-saving mechanism of the proposed controller.

EV Spreads and Semiconductor Convergence Study according to Price Inflection Points

  • Dae Sung Seo
    • International Journal of Internet, Broadcasting and Communication
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    • v.15 no.2
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    • pp.202-209
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    • 2023
  • This study aims to analyze the correlation between semiconductor innovation and market dominance in the mobility electric vehicle industry. To this end, the study presentsstrategiesthat provide low-price competitiveness along with high-value creation in the electric vehicle and semiconductor markets. The first change in the era of high interest rates is to overcome the crisis of survival for value. Furthermore, the study acknowledges the ongoing second wave of change as the digital technology's value continues to rise, and companies experience decreased productivity due to rising ESG labor costs. The study analyzed price competitiveness in the context of the increased adoption of electric vehicles and the integration of semiconductor prices, proving that Tesla and Samsung Semiconductor have developed technology to dominate the market, with appropriate low-cost strategies applied as the value of innovation declines.

The Evolution of Marketing Thought and Marketing Communication: The Perspective of Relationship Marketing (마케팅 사고의 변천과 마케팅 커뮤니케이션 : 관계 마케팅 관점)

  • Hwang, Byung-Il
    • Korean Business Review
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    • v.12
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    • pp.1-27
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    • 1999
  • The author focus on the role of IMC(integrated marketing communication)that is important for increase of relationship equity value, stress on the integration of IMC and PR in relationship marketing. This paper present as follow. The first, marketing thought have evolved through market competition situation at a market segmentation level perspective, and the concept of relationship equity is necessary to individual marketing or relationship marketing. The second, firm should identify profitable customer, build strong relationship for relationship equity, based on customer equity and life time value in customer market. The third, IMC needs integration with PR for relationship building of stakeholder including customer market at a point of view of corporate equity. Finally, this article offer discussion about implications of integration IMC and PR for future study.

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Suggestions of Big-Data Integration in Public Institutions for Supporting Start-up Businesses (창업지원을 위한 공공기관 빅데이터 통합 제언)

  • Kim, Do-Goan;Jin, Chan-Yong;Shin, Seong-Yoon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.05a
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    • pp.204-206
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    • 2015
  • Nowadays, many small businesses have experienced the failure of business or hardship. In this point, specific and integrated information for startup business should be required to decrease the rate of failure and to increase the rate of success. This study is to suggest the integration and big data of various data which various public institutions have separately. For this purpose, it is to classify the data types in constructing big-data for start-up business and to suggest a model of analysis in information system for supporting startup businesses.

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Dynamic responses of a beam with breathing cracks by precise integration method

  • Cui, C.C.;He, X.S.;Lu, Z.R.;Chen, Y.M.;Liu, J.K.
    • Structural Engineering and Mechanics
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    • v.60 no.5
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    • pp.891-902
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    • 2016
  • The beam structure with breathing cracks subjected to harmonic excitations was modeled by FEM based on Euler-Bernoulli theory, and a piecewise dynamical system was deduced. The precise integration method (PIM) was employed to propose an algorithm for analyzing the dynamic responses of the deduced system. This system was first divided into linear sub-systems, between which there are switching points resulted from the breathing cracks. The inhomogeneous terms due to the external excitations were tackled by introducing auxiliary variables to express the harmonic functions, hence the sub-systems are homogeneous. The PIM was then applied to solve the homogeneous sub-systems one by one. During the procedures, a predictor-corrector algorithm was presented to determine the switching points accurately. The presented method can provide solutions with an accuracy to a magnitude of 1012 compared with exact solutions obtained by the theories of ordinary differential equations. The PIM results are much more accurate than Newmark ones with the same time step. Moreover, it is found that the PIM can maintain a high level of accuracy even when the time step increases within a relatively wide range.

Performance Evaluation of the Gas Turbine for Integrated Ossification Combined Cycle (석탄가스화 복합발전용 가스터빈의 성능 평가)

  • Lee, Chan;Lee, Jin-Wook;Yun, Yong-Seung
    • The KSFM Journal of Fluid Machinery
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    • v.2 no.1 s.2
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    • pp.7-14
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    • 1999
  • This simulation method is developed by using GateCycle code for the performance evaluation of the gas turbine in IGCC(Integrated Gasification Combined Cycle) power plant that uses clean coal gas fuel derived from coal gasification and gas clean-up processes and it is integrated with ASU(Air Separation Unit). In the present simulation method, thermodynamic calculation procedure is incorporated with compressor performance map and expander choking models for considering the off-design effects due to coal gas firing and ASU integration. With the clean coal gases produced through commercially available chemical processes, their compatibility as IGCC gas turbine fuel is investigated in the aspects the overall performance of the gas turbine system. The predictions by the present method show that the reduction of the air extraction from gas turbine to ASU results in a remarkable increase in the efficiency and net power of gas turbines, but it is accompanied with a shift of compressor operation point toward to surge limit. In addition, the present analysis results reveal the influence of compressor performance characteristics of gas turbine have to be carefully examined in designing the ASU integration process and evaluating the overall performance parameters of the gas turbine in IGCC Power plant.

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Experimental Results of Ship's Maneuvering Test Using GPS

  • Yoo, Yun-Ja;Naknma, Yoshiyasu;Kouguchi, Nobuyoshi;Song, Chae-Uk
    • Journal of Navigation and Port Research
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    • v.33 no.2
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    • pp.99-104
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    • 2009
  • The Kinematic GPS is well known to provide a quite good accuracy of positioning within an level. Although kinematic GPS assures high precision measurement on the basis of an appreciable distance between a reference station and an observational point, it has measurable distance restriction within 20 km from a reference station on land. Therefore, it is necessary to make out a simple and low-cost method to obtain accurate positioning information without distance restriction In this paper, the velocity integration method to get the precise velocity information of a ship is explained. The experimental results of Zig-zag maneuver and Williamson turn as the ship's maneuvering test, and other experimental results of ship's movement during leaving and entering the port with low speed were shown. From the experimental results, ship's course, speed and position are compared with those obtained by kinematic-GPS, velocity integration method and dead reckoning position using Gyro-compass and Doppler-log.

Experimental Results of Ship's Maneuvering Test Using GPS

  • Yoo, Yun-Ja;Hou, Dai-Jin;Hamada, Masaaki;Nakama, Yoshiyasu;Kouguchi, Nobuyoshi
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2006.10a
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    • pp.49-55
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    • 2006
  • Kinematic GPS provides quite good accuracy of position in cm level. Though K-GPS assures high precision measurement in cm level on the basis of an appreciable distance between a station and an observational point, but it has measurable distance restriction within 20 km from a reference station on land. So it is necessary to make out a simple and low-cost method to obtain accurate positioning information without distance restriction. In this paper, the velocity integration method to get the precise velocity information of ship is explained. Next two experimental results (Zig-zag maneuvering test and Williamson turn) as the ship's maneuvering test and also the experimental results of leaving and entering port as slow speed ship's movement were shown. In these experimental results, ship's course, speed and position are compared with those obtained by kinematic-GPS, velocity integration method and dead reckoning position using Gyro-compass and Doppler-log.

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The Migrant Women Policy in Korea : Prospect and Implication in the point of Interculturalism (한국의 여성 결혼이주자정책 : 상호문화주의적 조망과 함의)

  • Kim, Kyung Sook
    • Journal of Digital Convergence
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    • v.12 no.9
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    • pp.21-33
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    • 2014
  • This is a research on the characteristic and its limit of Korean migrant women policy to prospect and suggest in the point of interculturalism. The focus of this paper is in summing-up to current situation of multiethnic society which rapidly progressing in Korea and in reviewing the race-oriented, gender-biased issue in the migrant women policy in Korea. However, the migrant women go through by the unique rebuilt progress in the transnational social field which can be continue for several or for decades between delivery country and inflow country but the one-sided, certain movement to a new country. In the above mentioned standpoint, this paper can suggest the implication for the concept and its character of interculturalism, the policy and undertasking case in Europe as a realistic directing point on which the migrant women policy in Korea. The educational program consolidation of intercultural citizenship, the orientation of pluralistic integration through selective assimilation, the consolidation of intercultural adaptation program, the intercultural measurement metrics development and feedback which considered of Korean characteristics are proposed in this paper.

Effect of Bonding Process Conditions on the Interfacial Adhesion Energy of Al-Al Direct Bonds (접합 공정 조건이 Al-Al 접합의 계면접착에너지에 미치는 영향)

  • Kim, Jae-Won;Jeong, Myeong-Hyeok;Jang, Eun-Jung;Park, Sung-Cheol;Cakmak, Erkan;Kim, Bi-Oh;Matthias, Thorsten;Kim, Sung-Dong;Park, Young-Bae
    • Korean Journal of Materials Research
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    • v.20 no.6
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    • pp.319-325
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    • 2010
  • 3-D IC integration enables the smallest form factor and highest performance due to the shortest and most plentiful interconnects between chips. Direct metal bonding has several advantages over the solder-based bonding, including lower electrical resistivity, better electromigration resistance and more reduced interconnect RC delay, while high process temperature is one of the major bottlenecks of metal direct bonding because it can negatively influence device reliability and manufacturing yield. We performed quantitative analyses of the interfacial properties of Al-Al bonds with varying process parameters, bonding temperature, bonding time, and bonding environment. A 4-point bending method was used to measure the interfacial adhesion energy. The quantitative interfacial adhesion energy measured by a 4-point bending test shows 1.33, 2.25, and 6.44J/m2 for 400, 450, and 500C, respectively, in a N2 atmosphere. Increasing the bonding time from 1 to 4 hrs enhanced the interfacial fracture toughness while the effects of forming gas were negligible, which were correlated to the bonding interface analysis results. XPS depth analysis results on the delaminated interfaces showed that the relative area fraction of aluminum oxide to the pure aluminum phase near the bonding surfaces match well the variations of interfacial adhesion energies with bonding process conditions.