• Title, Summary, Keyword: SOC

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Theoretical Analysis on Optimal SOC Investment in Urban Planning (도시계획관련 사회간접자본 투자의 적정성 분석을 위한 이론적 고찰)

  • 박재홍
    • Journal of the Korean Regional Science Association
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    • v.10 no.2
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    • pp.45-51
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    • 1994
  • The purpose of this paper is to present the optimal investment conditions of SOC facilities for maximizing regional social welfare in implementing the urban development project in the theoretical fashion. Particularily, SOC facilities are divided into both supply-side($P_s$) and demand-side SOC ($P_d$) in the paper. General equilibrium analysis from the intra-regional viewpoint by utilizing Pareto's Optimal Conditions and by revising Samuleson's Conditions for public goods($P_s$ and $P_d$) results in the optimum pattern of SOC investment. The following are important implications from the analysis. First, rather than the pursue social equity, SOC investment is to resolve the issue of efficiency to activate the regional economy. Second, the marginal rate of transformation (MRT) between $P_s$ and $P_d$ in the region is to play a significant role in structuring SOC investment plant of local government for social welfare maximization. Third, the optimal SOC investment policy based on this regional economy but also to generate the enhancement of soical amenities of the residents.

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The Estimation of the SOC and Capacity for the Lithium-Ion Battery using Kalman Filter

  • Lee, Seong-Jun;Kim, Jong-Hoon;Lee, Jae-Moon;Cho, Bo-Hyung
    • Proceedings of the KIPE Conference
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    • pp.60-62
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    • 2007
  • The open circuit voltage (OCV) is widely used to estimate the state of charge (SOC) in many estimation algorithms. However, the relationship between the OCV and SOC can not be exactly same for all batteries. Because the conventional OCV-SOC differs between batteries, there is a problem that the relationship of the OCV-SOC should be measured to accurately estimate the SOC. Therefore, the conventional OCV-SOC is modified to a new relationship in this paper. Thus, problems resulting from the defects of the extended Kalman filter (EKF) can be avoided by preventing the relationship from varying. In this paper, SOC and capacity of the lithium-ion battery are estimated using the dual EKF with the proposed method.

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Secondary Battery SOC Estimation Technique for an Autonomous System Based on Extended Kalman Filter (자율이동체를 위한 2차 전지의 확장칼만필터에 기초한 SOC 추정 기법)

  • Jeon, Chang-Wan;Lee, Yu-Mi
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.9
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    • pp.904-908
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    • 2008
  • Every autonomous system like a robot needs a power source known as a battery. And proper management of the battery is very important for proper operation. To know State of Charge(SOC) of a battery is the very core of proper battery management. In this paper, the SOC estimation problem is tackled based on the well known Extended Kalman Filter(EKF). Combined the existing battery model is used and then EKF is employed to estimate the SOC. SOC table is constructed by extensive experiment under various conditions and used as a true SOC. To verify the estimation result, extensive experiment is performed with various loads. The comparison result shows the battery estimation problem can be well solved with the technique proposed in this paper. The result of this paper can be used to develop related autonomous system.

A SOC Estimation using Kalman Filter for Lithium-Polymer Battery (칼만 필터를 이용한 리튬-폴리머 배터리의 SOC 추정)

  • Jang, Ki-Wook;Chung, Gyo-Bum
    • The Transactions of the Korean Institute of Power Electronics
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    • v.17 no.3
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    • pp.222-229
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    • 2012
  • The SOC estimation method based on Kalman Filter(KF) requires the accurate battery model to express the electrical characteristics of the battery. However, the performance of KF SOC estimator can hardly be improved because of the nonlinear characteristic of the battery. This paper proposes the new KF SOC estimator of Lithium-Polymer Battery(LiPB), which considers the variation of parameters based on the hysteresis effect, the magnitude of SOC, the charging/discharging mode and the on/off load conditions. The proposed SOC estimation method is verified with the PSIM simulation combined the experimental data of the LiPB.

Comparison of SOC estimation using EKF of the LiFePO4 cell according to minor loop in individual SOC range (EKF를 이용한 SOC 구간별 개별 Minor loop에 따른 LiFePO4 셀의 SOC 추정성능 비교분석)

  • Lee, Hyun-jun;Park, Joung-hu;Kim, Jonghoon
    • Proceedings of the KIPE Conference
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    • pp.397-398
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    • 2015
  • 본 논문은 $LiFePO_4$ 셀의 SOC(State of Charge) 추정에서 가장 중요한 역할을 하는 모델 파라미터인 OCV(Open Circuit Voltage)의 설계에 관한 것이다. $LiFePO_4$ 셀은 히스테리시스 특성 때문에 Charging/Discharging OCV값을 이은 curve인 Major loop만으로는 신뢰도 높은 SOC 추정이 어렵다. 따라서, 기존의 Major loop에 추가적으로 SOC 10% 구간별로 Minor loop을 설계해 줌으로써 배터리 모델링의 정확도를 높이고, 이를 최종적으로 EKF(Extended Kalman Filter)알고리즘을 이용하여 SOC 추정으로 해봄으로써 정확도 향상을 비교해 보고 분석해 보고자 한다.

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Battery Cell SOC Estimation Using Neural Network (뉴럴 네트워크를 이용한 배터리 셀 SOC 추정)

  • Ryu, Kyung-Sang;Kim, Ho-Chan
    • Journal of IKEEE
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    • v.24 no.1
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    • pp.333-338
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    • 2020
  • This paper proposes a method of estimating the SOC(State of Charge) of a battery cell using a neural network algorithm. To this, we implement a battery SOC estimation simulator and derive input and output data for neural network learning through charge and discharge experiments at various temperatures. Finally, the performance of the battery SOC estimation is analyzed by comparing with the experimental value by Ah-counting using Matlab/Simulink program and confirmed that the error rate can be reduced to less than 3%.

A Study on the Improvement of SOC Project Planning Process and Systems (국내 SOC 사업의 기획업무 개선에 관한 연구)

  • Shin Dongwoo;Kim Yea-Sang
    • Korean Journal of Construction Engineering and Management
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    • v.1 no.1
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    • pp.45-52
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    • 2000
  • In Korea, demand for the Social Overhead Capital(SOC) projects has tremendously increased since 1970's and is expected to keep growing to support national economic development as well as to enhance the quality of life. In these projects, project planning and feasibility study phase is one of the most critical phases because it determines the success of later phases. However, we have experienced trial and errors repeatedly such as cost overruns and schedule delays in many of the SOC projects. These problems can be prevented or at least expected in the earlier phase and it requires well-developed and standardized project planning process and systems before design, procurement, and construction phases begin. Therefore, the purpose of this research is to investigate current problems in this phase and provide framework for a model for the project planning management which can be used for the SOC projects to insure the whole project success.

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A Study on Improvement of Cyber Security Framework for Security Operations Center (보안관제 조직을 위한 사이버보안 프레임워크 개선에 관한 연구)

  • Cho, Changseob;Shin, Yongtae
    • Convergence Security Journal
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    • v.19 no.1
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    • pp.111-120
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    • 2019
  • As cyber-attacks become more intelligent and sophisticated, the importance of Security Operations Center(SOC) has increased and the number of SOC has been increasing. In order to cope with cyber threats, institutions and organizations use a variety of cyber security standards to create business procedures. However, SOC often need to be improved in accordance with the SOC environment because they collaborate with managed security service specialists rather than their own personnel. The NIST cyber security framework, information security management system, and managed security service companies were compared and analyzed. As a result, it was found that the NIST CSF is a framework that is easy to apply to managed security service, The content was judged to be insufficient. Therefore, in this study, NIST CSF was used as a reference model to derive the management items required for SOC environment, and the necessity, importance and ease of each item were confirmed through an Delphi technique and an improved cyber security framework was proposed.

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The Improvement of Work Structure in the Private Investment SOC Project (민자 SOC사업의 시공단계 업무체계 개선방향)

  • Kim Daejin;Shin Seungtae;Lee Younghwan;Woo Sungkwon
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • pp.486-489
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    • 2004
  • To enlarge the international competition and construction productivity, the domestic construction market attracts the private capital and expands the facility of :iocial Overhead Capital(SOC). However, the application of the business system used at the public project didn't utilize the effect of social overhead capital. It caused problems that parties' business was inefficient and their allotment of the risk was inadequate. This paper presents the course to reorganize the business system which the coincides with the origin aim of the SOC. For the reformation of the supervisor's work scope and business system and the government's overall project management, in other words, this paper proposes the professional organization to replace the superintendence and the formation of optimal business system. This paper confirms the privity of contract among parties of SOC project and parties' work scope and system between relative laws and concession agreement that government made a contract with Special purpose Company (SPC).

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An Efficient Wrapper Design for SOC Testing (SOC 테스트를 위한 Wrapper 설계 기법)

  • Choi, Sun-Hwa;Kim, Moon-Joon;Chang, Hoon
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.41 no.3
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    • pp.65-70
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    • 2004
  • The SOC(System on Chip) testing has required the core re-use methodology and the efficiency of test method because of increase of its cost. The goal of SOC testing is to minimize the testing time, area overhead, and power consumption during testing. Prior research has concentrated on only one aspect of the test core wrapper design problem at a test time. Our research is concentrated on optimization of test time and area overhead for the core test wrapper, which is one of the important elements for SOC test architecture. In this paper, we propose an efficient wrapper design algorithm that improves on earlier approaches by also reducing the TAM(Test Access Mechanism) width required to achieve these lower testing times.