• 전력전자학회논문지
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• 제27권5호
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• pp.376-383
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• 2022

The improved performance of computer parts, such as graphic card, CPU, and main board, has led to the need for power supplies with a high power output. The dynamic load profile rapidly changes the usage of power consumption depending on load operations, such as PC power and air conditioner. Under dynamic load profile conditions, power consumption can be classified into maximum, normal, and standby power. Several problems arise in the case of maximum power. Peak power is generated at the system power source in the maximum-power situation. Frequent generation of peak power can cause high-frequency problems and reduce the life of high-pressure parts (especially high-pressure capacitors). For example, when a plurality of PCs are used, system overload occurs due to peak power generation and causes problems, such as power failure and increase in electricity bills due to exceeded contract power. To solve this problem, a system peak power limit/compensation power circuit is proposed for a power supply under dynamic load profile conditions. The proposed circuit detects the system current to determine the power situation of the load. When the system current is higher than the set level, the circuit recognizes that the system current generates peak power and compensates for the load power through a converter using a super capacitor as the power source. Thus, the peak power of loads with a dynamic load profile is limited and compensated for, and problems, such as high-frequency issues, are solved. In addition, the life of high-pressure parts is increased.

• 무역상무연구
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• 제39권
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• pp.27-55
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• 2008

The concept of non-conformity is stipulated at Art. 35, CISG. According to the Art. 35, there is no directly stipulated concept of non-conformity. But Art. 35 said that the Seller must deliver goods which are of the quantity, quality and description required by the contract and which are contained or packaged in the manner required by the contract. Accordingly, the concept of non-conformity contains the conformity of quality, quantity, description, delivery of different goods and documents. Art. 39 does not specify the form of notice required. So parties can require a particular form by agreement. If there is no agreed form of notice, buyer' s notice must be sent by means appropriate in the circumstances. And Art. 39 states that the required notice of lack of conformity must be given to the seller. Notice of defects conveyed by the buyer to an independent third party is not found to have been given by means appropriate in the circumstances. And Art. 39 is subject to the parties' power under Art. 6 to derogate from or vary the effect of any provision of the Convention. When determining which requirement must be satisfied by the buyer is specifying the nature of any lack of conformity, a mixed objective-subjective standard should be applied, which has regard to the respective commercial situation of the buyer and the seller, to any cultural differences, but above all, to the nature of the goods. Also to determine the specificity requirement is to satisfy the purpose of notice of lack of conformity.

• 한국통신학회논문지
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• 제36권5B호
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• pp.484-489
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• 2011

우리나라 IT중소기업은 대부분 핵심적인 기술을 가진 기업에게 부품을 수급받고, 이를 조립하여 대기업에 납품하는 기업이 많다. IT 중소기업의 현실적인 지적재산관련 문제는 직접적인 소송 혹은 클레임의 문제가 아니라 계약상의 제 3자 지적재산 침해문제 혹은 계약이 없을 경우에는 각 준거법상의 묵시적 손해배상 책임의 문제이나, IT중소기업의 협상력이 크지 않기 때문에 계약상에 명시적인 보증조항을 삽입할 수 없고, 각 준거법상으로도 소송의 경제성이 없는 경우가 많아서 실효성이 없기 때문에 이에 대해서 정부기관 및 산하 연구기관에서 연구을 하여 개선안을 도출해야한다고 생각된다.

• 자원ㆍ환경경제연구
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• 제9권2호
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• pp.421-449
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• 2000

The objective of this paper is to examine whether it is feasible to introduce an crude oil futures contract on domestic commodity exchange in order to minimize the price risks of imported crude oil. In addition. this study suggests the policy issues to promote futures trading and the alternatives to use foreign energy compares the five criteria to evaluate the feasibility of crude oil futures trading on the domestic exchange. Related to the possibility of successful futures trading of imported crude oil on the domestic exchange, they are evaluated as follows: it is highly possible to succeed for the aspects of price volatility, potential market size or liquidity, and commodity homogeneity; but it is inappropriate for the aspects of deliverable amounts and market power or market structure. Therefore, it is concluded that trading a new futures contract for the underlying imported crude oil on the domestic exchange is inappropriate. For the policy issues and the hedging alternatives, first, it is urgent to establish an atmosphere for futures trading by promoting spot trading. Second, for the case of futures trading on the domestic exchange it is important to consider the simultaneous hedging of crude oil price and foreign exchange risks and mutual offsetting mechanism with major foreign exchanges. Third, for the case of futures trading on foreign exchanges it is reasonable to regard cooperation among concerned companies, government support for futures trading and direct participation into futures trading by the government.

• 건축역사연구
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• 제29권5호
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• pp.17-28
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• 2020

The general contractor business in South Korea settled in the railway construction during the Daehan Empire, but depending on the construction intention and circumstances of the railroad, relationship among employer-contractor-subcontractor and their roles under the system of the construction process had changed. At the time of laying the Gyeongin and Gyeongbu-rail, the Empire, which had no capital and technology, passed all the power and responsibility of the rail laying to the contractor, who was involved in most of the process. After this, the empire tried to lay Gyeongui-railroad without the help of other countries. Japan prepared for the Russo-Japanese War and decided to construct the railway rapidly, and completed the railway in parallel with direct management work and contract work. From that time on, the general contractor would only do the work. During the construction of railroad in Daehan empire, the general contract business system was established. The ambiguous process was sorted out and divided. At this time, subjects in charge of design and construction has been divided. The internal organization of the project owner and the contractor were organaized and specialized.

• 통상정보연구
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• 제12권4호
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• pp.429-453
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• 2010

The purpose of this paper is to examine the significances of choosing the place of arbitration, the principles of fixing the place, which the major international arbitration institutions(including the ICC, LCIA, AAA, CIETAC and so on) have in their arbitration rules, and the methods of drafting the place of arbitration in arbitration agreements. When the contract parties have agreed on the place of the arbitration, the institutions have no role regarding the selection of the place of arbitration. But the parties have not agreed on the place of arbitration, it is fixed by the rules of selected institution, by considering the lists of criteria including local laws, N.Y. Convention, neutrality, convenience and so on. This author suggested four alternatives on how to designate the place of arbitration, and advantages and disadvantages of each one: the place of claimant, the place of respondent, the place agreed on in advance in Bilateral Agreement between two Arbitration Institutions established in two countries or the third country. In conclusion, the decision of all elements in the international contract is greatly influenced by the power of negotiation, and the place of arbitration in arbitration agreement has a lot of influential significances on both parties when resolving the disputes. So it is advisable for the parties to fix the place according to the global standard(the place of respondent), the arbitration rules of major international arbitration institutes and the result of the negotiation between parties.

• 융합신호처리학회논문지
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• 제2권2호
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• pp.55-61
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• 2001

본 논문에서는 cdma2000 규격을 채용한 역방향 링크 동기식 DS-CDMA 시스템을 시뮬레이션 하여 시스템의 성능을 분석하였고, 파일롯 채널과 정보 채널 즉, 기존의 트래픽 채널간의 최적 전력비를 구하였다. cdma2000 시스템은 기존의 IS-95와는 달리 파일롯 채널을 이용하여 페이딩 채널을 추정하고 이를 이용하여 채널 환경에 의한 수신신호의 위상변화를 보강해 준다. 채널 추정길이 31pcg 심볼에서 파일롯 채널과 트래픽 채널의 최적 전력비를 구하였다. 또한 시스템에 전력 제어를 적용하여 목표 FER을 만족시키기 위한 required Eb/No를 구하였고, 다중의 사용자가 고속의 데이터를 동시에 전송할 때의 성능을 분석하였다.

• 대한토목학회논문집
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• 제13권2호
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• pp.141-149
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• 1993

수력에너지 생산량은 추계학적인 저수지 유입량에 지배되므로 전력량 판매 계약에는 이를 반영하여 합리성을 보장해야 할 필요가 있다. 본 연구에서는 유입량의 신뢰도별로 저수지조작(貯水池操作)을 수행하여 최적 신뢰도 및 이에 따른 최적 전력 판매계약량을 결정하는 방법을 제시하였다. 목적함수에는 전력생산량이 신뢰도를 벗어나는 위험에 대한 손실함수를 도입하고, 손실계수의 범위를 제시하였다. 여기서 손실은 계약량을 공급하지 못할 경우 지불해야 할 벌칙량을 의미하고 신뢰도는 저수지 유입량에 대한 초과 확률과 같고, 이 때 확률밀도함수는 대수정규분포를 5% 유의수준에서 채택하였다. 최적의 신뢰도를 결정하기 위하여 오목함수 범위에서 황금비 조사 기법을 썼으며, 신뢰도별 최대 수력 에너지를 얻기 위해 증분 동적계획 기법으로 저수지 조작을 수행하였다. 본 연구의 적용대상으로 대청 다목적댐 및 수력발전소를 택하여 손실계수, 최적 신뢰도 및 계약 발전량을 구하였다.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 1999년도 제3회 전자장의 생체영향에 관한 워크숍
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• pp.173-186
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• 1999

Several epidemiological studies have suggested that residential or occupational exposure to power frequency magnetic fields (MF) might increase the risk of cancer. The objective of this study is to elucidate the possible carcinogenic effects of MF exposure using female Sprague-Dawley (Crj:CD)rats. A total of 360rats was randomly divided into 6 groups of 60 rats each. Two groups were served as a negative control (vehicle: sesame oil only) or a positive control (single oral administration of 7, 12dimethylbenz(a)anthracene; DMBA, 90mg/kg body weight at 50-52days of age). Other four groups were simultaneously exposed to 0 (sham-exposed) 7, 70 or 350 $\mu$T(rms), continuous circularly polarized 50HzMF, 22 hrs/day, 7 days/weeks for 30weeks from 8weeks of age. Experiment was conducted under SPF condition and in a blinded manner, Ten animals in each grout were served as satellite animals and their several hormonal concentrations in sera, such as melatonin and prolactin, collected at the midnight were measured. In addition, complete histopathological examination were performed in other 50 animals per each group. In the positive control group, the first mammary nodule was palpated at the 7th weeks of experiment in 5 out of 59 animals. Afterward, the incidence of palpable mammary nodules increased steadily and reached at 76% and 98% of live animals at 14weeks and the end of experiment in sham and 350$\mu$ T-exposed groups were not significantly different from those in the sham-exposed and negative control groups. Histopathologocally, most of palpable nodules were mammary tumors. The incidences of animals with mammary tumors per animals survived ant the end of experiment were 4.1 and 100% in the negative and positive control groups, and 0.0, 6.0, 8.0 and 6.0% in the sham-, 7, 70and 350 $\mu$T-exposed groups, respectively. These incidences in three MF-exposed groups were not significantly different from those in both the sham- exposed and negative control groups. Based on these results, it was not supported that continuous circularly polarized 50 Hz magnetic fields at up to 350$\mu$T affect the incidence of spontaneous mammary tumors in female SD rats under the present experimental conditions.

• 전기학회논문지
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• 제67권2호
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• pp.165-172
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• 2018

This paper presents a structure of the retail electricity market based on the local pool with LDERP(Local Distributed Energy Resource Provider) for small energy prosumers. LDERP is an operator for the proposed market, which conducts performance measurement and settlement by the distribution plan determined through contract with participants. The trading process is designed similarly to the negawatt market. In the case study, the many-sided conditions of the proposed market are comparatively analyzed with the existing prosumer programs. The results demonstrate the effectiveness of the proposed framework in determining the purpose of market operating for the benefit of participants according to the various situations.