• 통상정보연구
• /
• 제12권4호
• /
• pp.111-126
• /
• 2010

This paper provides an empirical investigation of the determinants of current accounts utilizing an exchange rate (ER), terms of trade (NET), industrial activity (IPI), world import volume (WIM), trade share of the China and Japan (CHJP), proportion of service trade (SERV). The period examined is 1991:1 through 2010:2. It is tested under different cases such as whether variables were cointegrated and whether there was an equilibrium relationship. The result showed that the hypothesis of no cointegrated vector could be rejected at the 5 percent level. The estimated error correction model showed that adjustment speed is fast. This paper also applies impulse-response functions to get additional information by considering the responses of the current account to the shocks of economic variables. The results indicate that current account responds negatively to industrial activity and proportion of service trade, and then decays very quickly.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2003년도 추계학술대회 논문집
• /
• pp.81-84
• /
• 2003

For increasing power of photovoltaic systems, serial and parallel connection needed. In parallel connection, a desirable characteristic of parallel-connected supply system is that individual converters share the load current equally and stably. The current sharing(CS) can be implemented using two approaches. The first one, known as a Droop method, and the other is Active current-sharing. In Droop method, current distribution characteristics relies on the high output impedance of each converter. This scheme is more simple and no need interconnections. but also has a disadvantages of degrading current sharing characteristics. In this paper, using droop method at multiful-parallel connection with it's convenience and simplicity.

• 전력전자학회논문지
• /
• 제17권2호
• /
• pp.150-157
• /
• 2012

This paper presents CAN-based parallel-operation and load-sharing techniques for the communication server power supply. With the load information obtained through CAN communication, each modules performs its current control independently and the power unbalance caused by impedance differences of converter modules can be reduced. In conventional method, slave modules are controlled by master module. On the other hand, the proposed load share algorithm uses the Multi-Master method. Therefore, accurate load sharing can be accomplished by the reference structure of each module's average current. Each converter has two stages and it is separated into PFC, which is responsible for harmonic regulation, and LLC resonant converter, which controls output voltage. To verified the performance of the proposed method, two 2KW prototypes has been implemented and experimented.

• 재무관리연구
• /
• 제26권1호
• /
• pp.221-263
• /
• 2009

This paper studies the behaviour of stock prices on the ex-dividend day in the Korean stock market. Since a majority of listed Korean firms are December firms whose fiscal year end in December and whose ex-dividend day falls on the same calendar day in the year, we use stock prices of Non-December firms to estimate the general stock price movements not related to cash dividends. We estimate excess returns on days around the ex-dividend day. Our major findings are (a) there is no tax clientele effect in Korea, (b) the opening price stock prices fell by the amount of the current cash dividend per share until 2001, but it does not fall as much as the current dividend per share since 2001. Furthermore, in contrast to the U.S. and the Japanese findings, (c) stocks earned negative excess returns on the ex-dividend day until 2001, after which all stocks are earning positive excess returns on the ex-dividend day, and (d) the closing stock price on the ex-dividend day that used to be even higher than the cum-dividend price until 2001 is lower than the opening stock price since 2001. The evidence suggests a structural break has happened around the year 2001.

• 한국컴퓨터정보학회논문지
• /
• 제8권1호
• /
• pp.140-148
• /
• 2003

B2B 전자상거래가 국가간에서 활발한 움직임이 전개될 시기도 멀지 않을 것으로 보인다. 우리는 B2B 전자상거래를 활성화하기 위해서는 민간주도의 자율적 규제원칙이 우선적으로 계속 추진되어야하고 기업간 협력정서와 기업간 관계 진작을 위한 정책수립 및 시행도 요구된다. 기업간 전자상거래의 효율성과 효과를 감안한 경쟁정책의 조율과 국제표준화 활동에의 적극 참여 등 정부 정책도 필수적이다. 그리고 현재 우리나라의 기업간 전자상거래 시장 확대를 위한 현황 분석은 물론 향후 정책대응 방안 마련도 되어야 한다. 그러기 위해서는 우리나라 기업간 전자상거래 시장 분석을 위한 기업거래 관행과 기업간거래 연계 방안 그리고 B2B 전자상거래 정책방향에 대한 분석이 계속 이루어져야 한다.

• 한국농촌건축학회논문집
• /
• 제8권2호
• /
• pp.80-93
• /
• 2006

This purpose was to explore various directions of elderly service welfare space in village community center. Data were collected 3 types that floor plans of village community centers from 24 villages, interview data of these centers use and needs from 24 aged leaders or 96 elderly. The results were as followed: 1) The floor plans of more than 50% was type IV that was composed a basic spaces(entrance, living room, two rooms, kitchen), a toilet space, a heating system space and a storage space. This type was a current basis of the rural village community centers for elderlies. 2) Elderlies used the centers at winter or out of agricultural season, and visited these to pass the time and to promote friendship among them. 3) Also they went these to take a meal together and to save down personal heating expenses. Their needs for centers were a temporary share dwelling space at winter, a maintain social relationship throughout a health, a education and a side work activity, supplying health or sports facilities, and setting up toilet space. Therefore the current centers were needed to add functions of a temporary share dwelling, a energy saving heat system and a social promoting relationship, and so these could be represented to a elderly welfare service center in rural villages.

• 무역학회지
• /
• 제47권6호
• /
• pp.229-246
• /
• 2022

In order to understand the economic damage of economic sanctions on trade between Korea and Russia, a trade structure analysis was conducted through statistics on import and export trade between Korea and Russia. Through the structural analysis of product trade, we tried to accurately analyze the current status of product trade between Korea and Russia. In the trade structure analysis, it was confirmed that the trade in goods between Korea and Russia decreased the most in market share and trade concentration. However, trade specialization, comparative advantage by market, and intra-industry trade index were not significantly affected despite strong economic sanctions. from Russia's point of view Smart measures are needed to address the current situation to avoid a greater economic downturn. The end of the war and the restoration of partnership with other countries are considered the most beneficial solutions for Russia and all countries, but it is difficult to predict how the war will go or what economic situation Russia will be in after the war.

• 플랜트 저널
• /
• 제7권3호
• /
• pp.42-47
• /
• 2011

One of domestic power generation companies, Korea East-West Power Corporation(EWP) had no performance in overseas business just two short years ago. However, EWP has accomplished breakthrough results with the profit of KRW 17.8 billion in 2010, only overseas business part. With overseas power plant growing fast, there is a possibility that EWP may face the limitation of sustainable growth with the current low income structure, which is mainly focused on commissioning and power plant management. Accordingly, this study was made on overseas biomass plant business participation plan through the establishment of joint venture. The characteristics of a joint venture establishment was searched, choosing business partner; the ideas of how to organize a joint venture was drawn, what the role of each partner in joint venture is, and what proper capital share is; and chose business field, considering changing global energy mix, renewable energy market scale, and growth prospects. Considering government policy for renewable energy vitalization and renewable energy market share, We chose the European union as a market to which our business entered.

• 지역연구
• /
• 제11권1호
• /
• pp.31-60
• /
• 1995

The distribution of economic activity over a mutually exclusive and exhaustive categorical industry-region matrix is modeled as a composition of two random components: the probability-like share distribution of jobs and the dynamic evolution of absolute aggregates. The former describes the individual activity location choice by comparing the predicted profitability of the current industry-region pair against that of all other alternatives based on the available information on industry-specific, region specific, or activity specific attributes. The latter describes the time evolution of macro-level aggregates using a dynamic reduced from model. With the seperation of micro choice behavior and macro dynamic aggregate constraint, the usual independence and identicality assumptions become consistent with the activity share distribution, hence multi-regional industrial migration can be represented by a set of probability evolution equations in a conservative Markovian from. We call this a Micro-Macro Composition Approach since the product of the aggregate prediction and the predicted activity share distribution gives the predicted activity distribution gives the predicted activity distribution which explicitly considers the underlying individual choice behavior. The model can be applied to interesting practical problems such as the plant location choice of multinational enterprise, the government industrial ploicy to attract international firms, and the optimal tax-transfer mix to influence activity location choice. We consider the latter as an example.

• 전기전자학회논문지
• /
• 제23권1호
• /
• pp.173-180
• /
• 2019

재생에너지의 점유율 증가에 의하여 출력이 제한되는 사례가 발생하고 있다. 전형적으로 풍력발전의 발전량이 높고 부하가 낮은 새벽시간에 출력제한이 주로 발생하였으나, 태양광발전의 점유율이 증가하면서 낮 시간에 풍력발전의 출력이 제한되는 사례가 발생하고 있다. 현재의 전력계통 운영 상황에서는 태양광발전의 점유율이 증가할수록 풍력발전의 출력 제한이 더욱 증가시킬 것이며, 이는 풍력발전 운영자의 어려움을 가중시킬 것이다. 본 논문에서는 발전원 그리고 발전소별 출력 제한을 위하여 전력계통의 운영 어려움 유발하는 에너지원의 우선 제약을 기준으로 설정하여 기준에 따라 재생에너지의 출력 제한량을 분배하는 방안을 제시하였다.