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      • KCI등재

        The Nonlinear Equivalent Input Disturbance Coordinated Control for Enhancing the Stability of Hydraulic Generator System

        Lan‑Mei Cong,Xiao‑Cong Li 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.2

        Hydraulic generator plays more important roles as a renewable clean energy in improving stability. As hydraulic generator enjoys strong nonlinear properties, traditional linearized control method may holds worse adaptability for vary disturbances. In order to solve the problem, a Nonlinear Equivalent Input Disturbance Coordinated Control (NEIDCC) method is proposed in this paper. The objective functions related to system control performance are frstly determined. Then the multi-objective equations satisfying the Brunovsky normal form are derived, by which the nonlinear control problem is transformed to linear space to be solved. The nonlinear equivalent control law is obtained from the linear law by calculating the Γ derivative of the objective functions. When the system is subjected to diferent disturbances, the designed NEIDCC control law supports dynamic damping by observing the disturbance to stabilize the oscillations. As a result, the control system holds good performance. The simulation results of the designed hydraulic turbine generator control system demonstrate the efectiveness of the NEIDCC method.

      • KCI등재

        A Note on Aspectual Properties of Korean Idioms

        Lan Kim 한국생성문법학회 2018 생성문법연구 Vol.28 No.3

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

        Kim, Lan. 2018. A Note on Aspectual Properties of Korean Idioms. Studies in Generative Grammar, 28-3, 433-447. This paper investigates aspectual properties of idiomatic expressions in Korean, the data that have not received much attention in the study of Korean idioms. Extending McGinnis’ (2002, 2005) observation concerning English, I examine aspectual behaviors of phrasal idioms in Korean and show that the meaning of phrasal idioms in Korean follows from the composition of their parts. If the current work is on the right track, it may offer support to the argument that has been made in generative grammar in which idioms are not just random units but may act as systematic and compositional phrases.

      • KCI등재

        가상 공유 공간을 위한 네트워크 구조

        최활란,이희웅 한국컴퓨터 그래픽스학회 1998 컴퓨터그래픽스학회논문지 Vol.4 No.1

        다중 사용자를 위한 가상 현실 시스템은 하나의 가상 공간을 여러 사용자가 공유하여 동시에 접근할 수 있는 환경을 제공한다. 이런 시스템은 네트워크 환경을 전제로 하기 때문에 네트워크를 통한 효율적인 작업능력이 시스템 성능을 좌우한다. 본 논문은 효율적인 가상 공유 공간을 위한 네트워크 환경으로 독립된 분산 구조를 갖는 클라이언트/서버 네트워크 구조를 제안한다. 이 구조는 전형적인 중앙 집중형 네트워크 모델(centralized network model)의 구성 요소인 서버와 클라이언트 사이에 가상 공간 일부를 독립적으로 구성?관리하는 중간 계층의 그룹들을 분산ㆍ배치하므로써 기존 시스템의 문제점인 확장성을 보완하고, 과다한 메시지 전송의 부담을 줄이는 한편, 가상 공간과 공간사이에 일관성 유지를 위한 메시지 전송을 제거하여 메시지 전송의 지연성(latency)문제를 해결하였다. 본 시스템은 실험 결과에서 보여준 바와 같이 LAN환경 뿐 아니라 WAN 환경에서도 기존의 방식에 비해 적은 오버헤드를 나타냈으며, 사용자 정의 형태의 메시지 프로토콜을 제공하는 메시지 핸들러를 두어 응용 시스템에도 적합한 네트워크 환경을 구성할 수 있는 틀을 제공하였다. A multi-user virtual reality system supports shared enviroments for concurrent accesses by multiple users. The performance of these systems depends heavily on the network environments. This paper xperiments an effective network model for shared virtual environments. This model has a middle layer called groups placed between the server and its clients, and the tasks of server are distributed to these groups. Using groups solves some of the problems of existing systems such as lack of scalability, message overheads, and latency due to message passing among locally communicating entities in the virtual environment. Some experiment show lower overhead than existing distributed virtual environment systems in WAN as well as LAN environments. This model also supports a method that can be used to construct application specific network environments using message handler which allows user-defined message formats.

      • KCI등재

        标准成本法与作业成本法融合的研究

        徐香?(Xu, Xiang-Lan),金春洙(Kim, Chun-Soo) 한국국제회계학회 2017 국제회계연구 Vol.0 No.75

        With the rapid development of science and technology and the popularization of information technology, the production environment and manufacturing processes have changed significantly, enterprises increasingly rely on machines and computer control program. The proportion of direct labor costs in the product cost structure has sharply declined, while the proportion of manufacturing cost has increased substantially. With the change of product cost structure, the focus of cost control is gradually shifted from direct material cost and direct labor cost to the manufacturing cost. In order to adapt to the new manufacturing environment, establishing a scientific cost management system has become an inevitable trend. Although the standard cost method provides a cost basis for cost control and performance evaluation, it is not easy to find out the specific link of the cost variance due to too single manufacturing cost distribution standard. Therefore, it is necessary to introduce the basic idea of activity-based costing in the process of setting product standard cost. Based on the activity, the manufacturing cost of the product is allocated by different allocation ratio to ensure the accuracy of product cost accounting. This paper which is based on the standard cost method and activity-based cost method discusses the necessity for the integration of both, and describes its application in Boiler Manufacturing X Co. Ltd. to seek a new cost management model to adapt to the manufacturing environment of modern enterprises. Through the integration of standard cost method and activitybased costing method, the enterprise management goal and the specific production operation are combined to achieve the effective control of product cost.

      • KCI등재

        Verb Copying and Situation Delimiters in Chinese

        박혜선,Zhang Lan 대한언어학회 2006 언어학 Vol.14 No.2

        Park, Hyeson & Zhang, Lan. 2006. Verb Copying and Situation Delimiters in Chinese. The Linguistic Association of Korea Journal, 14(2), 115-131. Chinese has the verb copying construction, in which a verb is copied after a non-referential/non-specific object in the presence of adverbial elements such as duration and frequency phrases, or the complex stative construction. Several analyses have been proposed for this construction from both formal and functional perspectives. Among the formalists, Yi (1990) proposes that verb copying occurs to assign case to the adverbial, which is an NP in Chinese. In this paper, incorporating Yi's case approach and Wechsler and Lee's (1996) theory on 'situation delimiters', and in comparison with Korean accusative marked adverbials, we propose a new analysis of the verb copying construction. Wechsler and Lee (1996) propose that accusative marked adverbials in Korean are situation delimiters and they get accusative case due to the universal principle, Case Domain Generalization (CDG), which states that the domain of direct case for a predicate may be extended to include a situation delimiter. Contrary to Wechsler & Lee, however, we propose that CDG is not a universal principle; rather, it is parameterized depending on whether multiple accusative case checking is allowed or not in a language. Since Chinese does not allow multiple case checking, verb copying is utilized to license the situation delimiters.

      • 韓國 開化期에 있어서의 家族倫理 意識

        申蘭植 순천대학교 어학연구소 1991 어학연구LANGUAGE STUDIES Vol.3 No.-

        This paper aims to examine the family ethics educated in school in the enlightened age from 1890's when the Western school was established to 1910 when Japan made an annexation of Korea, and to examine how our traditional family ethics much valued in our Sodang and Hyanggyo was treated in that school. 1. The family members should have an obligation to do their best for the continuationand development of their family. The principle of social construction was identified with that of family construction and the national construction was also explained by the same principle. 2. Since Korean traditional family ethics were established, centering around the relationship between parents and children, the relation of parents and children was given priority over the relationship between husband and wife. In the modern family, the mutual relationship between parents and children is emphasized, while in the traditional family, only filial duty that the children should do was emphasized. Filial duty was accorded the first rank among the human ehtics and was emphasized as the origin of all deeds. 3. the relation of husband and wife was the relationship of master and servant which emphasized wife's duty more than husband's duty. The family ethics educated during the period of Korean enlightenment though the Western school system was purely traditional ethics influenced dominantly by the Confucian ideas. there cannot be found any bit of modern Western family ethics.

      • KCI등재

        국내 웹검색도구의 특성 및 탐색 기능 평가에 관한 연구

        이란주,최경화 한국문헌정보학회 1997 한국문헌정보학회지 Vol.31 No.1

        최근에 국내외의 웹문서들을 대상으로 한글의 특징적인 면을 고려해서 편리하게 이용할 수 있는 국내 검색도구들이 개발되고 있다. 본 연구의 목적은 이러한 국내 검색도구들의 종류를 살핀 뒤, 이들의 특성을 파악해 이용자 입장에서 정보요구에 적합한 검색도구를 선택하도록 돕는데 있다. 검색도구를 크게 목록서비스(코시크, DIR, ZIP, 넷퀘스트21, 심마니)와 검색엔진(심마니, 까치네, 정보탐정, 애니서치, 유니파인더, 웹글라이더, 미스다찾니)으로 나누고 이들의 현황, 검색옵션과 장단점 및 성격등을 비교·평가함으로써 정보요구에 따른 검색도구 선택에 대한 방법론을 제공한다. 또한 국내 검색도구의 문제점을 지적함으로써 보다 향상된 검색도구의 설계에 도움이 되고자 한다 The purpose of the article is to help users to select appropriate Korean WWW search tools and to retrieve Web documents for their information needs by using them effectively. It analyzes the characteristics, functions, and advantages and disadvantages of each search tool, while search tools are divided broadly by two categories - subject directory services (Kor-seek, DIR, ZIP, Netquest21, Simmany) and keyword search engines (Simmany, Kachine, Jungbotamjung, Anysearch, Unifinder, Webglider, Missdachanni). It provides the selection criteria of search tools for users who have information needs. In addition, the study also attempts to contribute to the improvements in designing Korean WWW search tools, as investigating their shortcomings

      • 赤米의 Anthocyan 色素에 關한 硏究

        이란숙,박종대,박근형 全南大學校 農業科學技術硏究所 1993 農業科學技術硏究 Vol.28 No.-

        상해향혈나 赤米 색소의 식품가공용으로서의 이용가능성에 대한 기초조사로서 赤米 색소의 이화학적 성질과 총 anthocyanin 함량 측정 결과는 다음과 같다. 1. 赤米 색소 추출물은 0.1N NaOHdp 의해 청색으로 변했고, 다시 0.1N HCl을 가해보니 본래의 색으로 복원되었으며, ether와 chloroform에는 전혀 녹지 않아 赤米색소 추출물은 anthocyanrP임을 추정할 수 있었다. 2. 赤米의 anthocyan 색소는 aluminum chloride, ammonium molybdate, 그리고 lead acetate 시약 처리에 의해 청색으로 변색되어 赤米 색소는 cyanidin, delphinidin, petunidin계 中 어느 한계에 속하는 색소임을 추정할 수 있었다. 3. 赤米 색소의 흡수 spectrum은 전형적인 anthocyanin의 흡수 spectrum을 보였으며, 흡수극대파장은 530nm, ????/???? (%) 比값은 19.4를 나타냈다. 그리고 5% ???? ethanol 용액 첨가에 의해 장파장 쪽으로 이동함을 보여 이상의 분광학적인 성질을 종합해 본 결과 赤米 색소 anthocyanin은 cyanidin 계의 3-monoglucoside 배당체 임을 추정할 수 있었다. 4. 赤米 색소의 TLC와 PC 분석 결과 각각의 용매계에서 단일 spot를 보여 단일종의 anthocyanin으로 구성되었음이 시사되었으나 HPLC 분석 결과 90% 이상을 차지하는 주 peak외에 작은 peak가 인정되었다. 5. 주 색소가 cyanidin-d-monoglucoside로 알려진 자두의 anthocyan 색소를 동일한 조건의 HPLC를 행한 결과 赤米의 주 anthocyan 색소의 data와 일치하여 赤米의 anthocyan 색소는 cyanidin-3-mono-glucoside로 확인되었다. 6. 赤米 색소의 총 anthocyan 함량은 14.3% 수분량을 갖는 赤米 100 g당 cyanidin-3-monoglucoside 형태로 40.3 mg 있었다. 이상의 결과를 종합해 볼 때 赤米 색소는 cyanidin-d-monoglucoside가 주 색소를 이루었으며, 총 anthocyan 함량은 赤米 100g당 cyanidin-3-monoglucoside 형태로 40.3mg 있었다. This study investigated red rice pigments with red color as a possibility of use them in the food processing. In order to separate and identify the pigments, the red rice of sanghaehyanghyulna was extracted with hydrochloric acid in methanol. The pigments were identified as the anthocyan by qualitative test. Base on the separated pattern thin layer chromatography, paper chromatography and spectrophotometric characteristics, the main anthocyanin of red rice pigments was identified as cyanidin-3-monoglucoside. This conclusion was supported by the comparison with high performance liquid chromatography chromatogram of the plum pigments in which the major anthocyanin was reported cyanidin-3-monoglucoside. The total anthocyanin content in red rice pigments was calculated 40.3 mg/100g weight.

      • KCI등재

        '사과배' 원 조성사업의 경제적 타당성분석 : 중국 연변지역을 중심으로

        조란화,임재환 충남대학교 농업과학연구소 2002 농업과학연구 Vol.29 No.1

        The most representative fruit in Yanbian area is Applepear(Ping Guo Li). It has been a important resource of farm income. According to the economic growth and income increase of individual consumers, food consumption pattern will be changed from grain to high value cash crops such as Applepear and vegetables. The globalization and adaption of free market oriented economic policy of China government have led to change the collective farming system to individual farm management system. The institutional transformation have brought about high productivity of farm products and incomes of farmers. Therefore the plantation area of Applepear and requirement of investment cost for establishment of Applepear farms have increased rapidly since the 1980's, the time of perestroika and glasnost in Chinese economy. In prosperity of Chinese agriculture, individual farmer's decision making as free selection of farmland use, selection of high pay-off crops, free sale of the products in free market and credit support for the project might be the most important factors. In case of Applepear farm development, net present value of the project net benefit was estimated at 55,518won per hectare and financial rate of return was 21%. The benefit/cost ratio of the project was 2.11. Considering 10% of discounting rate or the opportunity cost of capital in China the Applepear farm development project showed us economically feasible in the light of the above efficiency indices. The Chinese government has to support Applepear farm development project financially and institutionally considering the high-pay off benefit of the fruit and farmer's income increase in the future.

      • KCI등재

        인용문헌에 의한 정보검색 효과에 관한 고찰

        이란주 한국문헌정보학회 1994 한국문헌정보학회지 Vol.27 No.-

        Databases publicly available for online searching permit both citation and subject searching, however, subject searching has dominated the online search environment. Despite the power of citation searching, it may be underutilized. This study explored the relationship between the number of cited references used in a citation search and information retrieval effectiveness, a relatively unstudied phenomenon. Three articles in the library and information science literature were chosen to represent sample questions. Cited reference searches were conducted for each article and each of its references. All searches were conducted in Social Scisearch and Scisearch on DIALOG. Relevance judgments on the retrieved citations were obtained from the authors of the original articles. This research focused on analyzing, in terms of information retrieval effectiveness, the overlap among postings sets retrieved by various combinations of cited references. The findings from the three case studies clearly showed that the more cited references used for the citation search, the better the performance, in terms of retrieving more relevant documents, up to a point of diminishing returns. In addition, generally the overall level of overlap among relevant documents sets was found to be low. Therefore, if only some of the cited references among many candidates are used for a citation search, a significant proportion of relevant documents may be missed. The analysis of the characteristics of cited references provided the ways to predict which cited references would be useful to improve information retrieval. The findings of this comprehensive exploratory study are of interest for both theoretical and practical reasons. They contribute to the development of a theoretical model for the effective use of the citation search. This model might also be implemented in operational online systems. In addition, the findings potentially will help online searchers improve their search strategies using the citation search so that they can better achieve their information retrieval goals: the retrieval of items relevant to a given question and suppression of nonrelevant items

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