忠淸南道의 農業情報시스템 構築에 관한 硏究

최병익,위오기,이규대 한국국제지역사회개발학회 1995 地域社會開發學術誌 Vol.5 No.-

This study was carried out to develop an effective rural information system in Chung-Nam province. Data were collected from farmers of the study area through questionnaire as well as library research. And surveys were conducted to analyse the status of regional information centers of Chongyang county and Taean county. Discussions with specialists such as professors, extension workers, and officials of relevant fields were also conducted. However, the results obtained were as follows; 1) As a whole the level of Korean information industry was some far bellow than those of U. S. A or Japan. However, in some area such as telephone, there was not so big gap among Korea, Japan and U. S. A. 2) Considering present adoption of medium, the functions, and PC was the most effective for regional informationization. 3) The level of informationization of the majority of farmers and power elite in rural area was so low in the study area. 4) The majority of farmers adopted rural information through TV and telephone, however, the rural information system of regional information centers was PC system and there is no other alternatives. 5) Not enough time(several months or one year) was given to establish regional information centers, hence, grass root foundation of informationization was so weak. 6) Considering Taean and Chongyang regional information center, it would be more desirable to establish new information centers in the rest areas by community colleges/universities. 7) For an effective informationization of Chung -nam, informal education, linking sectors and participation of community colleges/universities were recommended. 8) An ideal system of regional information center were suggested such as Fig-1. and Fig-2. An Some important informations of countries of Chung-nam and potential IPs were recommended as Table 25 and Table 26, respectively.

지역 식품산업 개발전략

최병익 公州大學校 地域開發硏究所 1996 地域開發硏究論叢 Vol.4 No.1

이 연구는 지역식품산업의 개발전략의 준거틀을 구상한 것이다. 먼저 해방이후 현재까지 농촌 개발의 흐름과 지역식품산업의 환경변화를 개관하였다. 그리고 지역식품산업개발의 전략적 개념 모형으로 ① 주민주도 즉, 생산자 주도 ② 창조적 아이디어의 개발 ③ 협동의 유인 ④ 독창적 상품의 개발 ⑤ 지역사회문화로 승화 ⑥ 경쟁력 증대 ⑦ 상품을 포함한 지역문화의 정보화 ⑧ 궁극적으로 이상적 지역사회건설 등 CI운동 모형을 제시하였다. 또한 예산군을 대상으로 지역 식품 산업개발에 대한 제언을 포함한 지역식품산업 육성의 방향을 모색하였다.

農村地域 綜合開發事業의 課題와 展望

崔秉翼,尹畯相,安相根 公州大學校 地域開發硏究所 1995 地域開發硏究論叢 Vol.3 No.1

SummaryThis study was carried out to review the development polices implied to Korean rural area since the late 1940s. Policies such as Community Development(C. D), Pilot Village Construction Project, Saemaul Projects, Integrated Rural Development planning, and Village Reconstruction Project, and so on. Cases were also reviewed in several areas through literatures. Problems found and alternatives recommended are as follows: 1. Not enough time(several months ∼ a year) is spent for to set up master plans. 2. Little cooperation system is established among relevant organizations. 3. A pilot project with long time(3 ∼ 5 years) in planning is needed for theoretical and practical advancement of the study field.

DC Microgrid Operational Method for Enhanced Service Reliability Using DC Bus Signaling

Pyeong-Ik Hwang,Gilsoo Jang,Gi-Chan Pyo,Byung-Moon Han,Seung-Il Moon,Seon-Ju Ahn 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.2

This paper proposes a DC microgrid operational strategy and control method for improved service reliability. The objective is to supply power to as many non-critical loads as possible, while providing an uninterrupted power supply to critical loads. The DC bus signaling method, in which DC voltage is an information carrier, is employed to implement the operational strategy in a decentralized manner. During grid-connected operation, a grid-tied converter balances the power of the microgrid by controlling the DC voltage. All loads are connected to the microgrid, and operate normally. During islanded operation, distributed generators (DGs), a backup generator, or an energy storage system balances the power. However, some non-critical loads may be disconnected from the microgrid to ensure the uninterrupted power supply to critical loads. For enhanced service reliability, disconnected loads can be automatically reconnected if certain conditions are satisfied. Control rules are proposed for all devices, and detailed microgrid operational modes and transition conditions are then discussed. Additionally, methods to determine control parameter settings are proposed. PSCAD/EMTDC simulation results demonstrate the performance and effectiveness of the proposed operational strategy and control method.

Three-Phase Steady-State Models for a Distributed Generator Interfaced via a Current-Controlled Voltage-Source Converter

Pyeong-Ik Hwang,Gilsoo Jang,Seung-Il Moon,Seon-Ju Ahn IEEE 2016 IEEE transactions on smart grid Vol.7 No.3

<P>This paper proposes three-phase steady-state models for a distributed generator (DG) interfaced to a main system via a three-wire current-controlled voltage-source converter. In order to represent the DG in a realistic manner, the three major factors that determine the steady-state phase outputs under unbalanced operating conditions are considered: 1) the power control strategy; 2) output filter; and 3) voltage and current sensor positions. Based on these factors, the DGs are classified into various types. According to the position of the voltage sensor, two equivalent circuit models including an equivalent three-phase current source (ETCS) are proposed. For each type of DG, the output current of the ETCS is formulated as a function of the voltage of the ETCS-connected node, the filter impedances, and the active and reactive power references. To verify the accuracy of the proposed models, the results of the power flow incorporating them are compared with those obtained from the PSCAD simulation using detailed dynamic models of the DG.</P>

Studies on Scale Economies of Agricultural Cooperatives in Yesan Kun, Chung-Nam,Korea : 예산군의 단위조합을 중심으로

Choe, Pyeong Ik 公州大學校 地域開發硏究所 1992 地域開發硏究論叢 Vol.1 No.1

전압 및 배전 손실을 고려한 분산전원의 무효전력 제어 기법

황평익(Pyeong-Ik Hwang),윤용태(Yong-Tae Yoon),문승일(Seung-Il Moon),추철민(Cheol-Min Chu) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7

본 논문에서는 배전계통의 전압을 적정 수준으로 유지하며 배전 손실을 최소화하기 위한 분산전원의 무효전력 제어 기법을 제안한다.

DC Microgrid Operational Method for Enhanced Service Reliability Using DC Bus Signaling

Hwang, Pyeong-Ik,Jang, Gilsoo,Pyo, Gi-Chan,Han, Byung-Moon,Moon, Seung-Il,Ahn, Seon-Ju The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.2

This paper proposes a DC microgrid operational strategy and control method for improved service reliability. The objective is to supply power to as many non-critical loads as possible, while providing an uninterrupted power supply to critical loads. The DC bus signaling method, in which DC voltage is an information carrier, is employed to implement the operational strategy in a decentralized manner. During grid-connected operation, a grid-tied converter balances the power of the microgrid by controlling the DC voltage. All loads are connected to the microgrid, and operate normally. During islanded operation, distributed generators (DGs), a backup generator, or an energy storage system balances the power. However, some non-critical loads may be disconnected from the microgrid to ensure the uninterrupted power supply to critical loads. For enhanced service reliability, disconnected loads can be automatically reconnected if certain conditions are satisfied. Control rules are proposed for all devices, and detailed microgrid operational modes and transition conditions are then discussed. Additionally, methods to determine control parameter settings are proposed. PSCAD/EMTDC simulation results demonstrate the performance and effectiveness of the proposed operational strategy and control method.

농촌경제와 문화에 있어서 친환경 농업과 녹색관광의 역할에 관한 연구

최병익 ( Pyeong Ik Choe ),김명희 ( Myung Hee Kim ) 한국녹지환경디자인학회 2005 녹지환경학회지 Vol.1 No.2

In order to survive, Korean agriculture should be competitive in terms of price, quality supply regular and service delivery. However, it is hard to compete with imported agricultural products for domestic products regarding to low price. This price factor drove Korean farmers to find several alternatives such as sustainable agriculture(SA), green tourism(GT), and pooling system of marketing. From the late 1980s, SA has steadily pulled out consumers interest owing to increasing household income and seeking pollution-free food. According to consumer`s needs, agribusiness concerning SA has drastically developed, so far. GT has also been applied by the government for farmers. The project has been developed mainly by Ministry of Agriculture and Forest(MAF) as one of means supporting and diversifying the rural economy. The followings are accomplishment, and learning of SA and GT, so far: ·SA is believed as one of alternatives enhancing agricultural competitiveness of Korea. ·Volumes of SAP and farmer`s direct selling are increasing. ·Consumer`s willing to pay for SAP is much higher(158.0~217.6%) comparatively. ·Incentives-compensation system is an available accelerator for development of SA. ·Corporate identity(CI) clinic of packing design is available for development of SA. ·Urban and rural exchange is accelerated through GT, and it is believed to support SA and boost farm income, ·Farming experience enhances understanding of visitors on SA and rural culture. ·Various programs, support of specialists and government, total participation of community and women involvement make synergy effect for development of SA and GT.

적응 간격 크기 셈법을 이용한 급전운영자 훈련 프로그램 용 전력계통 시뮬레이터 개발

황평익(Pyeong-Ik Hwang),안선주(Seon-Ju Ahn),문승일(Seung-Il Moon),윤용태(Yong-Tae Yoon),허성일(Seong-Il Hur) 대한전기학회 2010 전기학회논문지 Vol.59 No.3

Since it is almost impossible to train the dispatchers with real power system, the dispatcher training simulator(DTS) is used for the training. Among various components of the DTS, the power system model(PSM) emulates the dynamic behavior of the power system to calculate the frequency and voltage. The frequency is calculated from various parameters such as mechanical power of power plants, load, inertia, and the damping of the power system. In the PSM, the power plants are modeled as differential equations, so the mechanical power of the power plants are calculated by the numerical methods. Conventionally, the fixed step-size algorithm has been used in the PSM, however it has some drawbacks. This paper develops the prototype PSM using the Matlab, and analyzes the problems of the fixed step-size algorithm by comparing the results with those of PSCAD simulation. In order to overcome the limitations, this paper proposes a modified frequency calculation method using the adaptive step-size algorithm. From the simulation using the proposed method, it is verified that the accuracy of frequency calculation increases substantially while the simulation time is not greatly increased.