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- 저자 : 李建烈 (검색결과 8 건)
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Recent advances in metasurface hologram technologies (Invited paper)
이건열,성장운,이병호 한국전자통신연구원 2019 ETRI Journal Vol.41 No.1
Since Leith and Upatnieks demonstrated the first optical hologram in 1964, hologram technology has attracted a great deal of interest in a wide range of optical fields owing to its potential use in future optical applications such as holographic imaging and optical data storage. Although there have been considerable efforts to develop holographic technologies using conventional optics, critical issues still hinder future development. Recently, metasurfaces composed of artificially fabricated subwavelength structures have been considered as novel holographic devices that show an unprecedented ability to control electromagnetic waves. In this review, we outline the recent progress in metasurface holography. A general introduction to several types of metasurface holography categorized based on their physics and application is provided. Then, our personal perspective on the future of this field is discussed.
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李基雄,朴俊根,李建烈 順天大學校 1993 論文集 人文社會科學篇 Vol.12 No.-
There is a general perception that agriculture should conserve the environment in a stable and sustainable condition as well as provide a safe and stable food supply. However agricul- tural practices often pose hazards to the environment including the agro ㄳecosystem. During the late 1980s and early 1990s, many korean farmers began to increase their in- puts of chemical fertilizers and pesticides, without crop rotations and animal manures to maintain soil productivity. Intensive tillage and the lack of appropriate conservation practices often resulted in excessive soil erosion, the pollution of surface and ground water, and a de- dine in soil productivity. Consequently there has been a growing public concern about adverse impacts of agricul- ture on the environment and on the safety and quality of food. Questions have also been raised of whether the korean agricultural production system is sustainable over the long term. By the way, sustainable agriculture is increasingly viewed as a long-term goal that seeks to overcome problems and constraints that confront the economic viability, environmental soundness, and social acceptance of agricultural production systems in the worldwide. In the literature there are hundered of definitions of sustainable agriculture but USDA de- fines as follows : Agriculture that for the foreseeable future will be productive, competitive and profitable, conserve natural resources, protect the environment, and enhance public health, food quality, and safety. Sustainable agriculture could be an alternative principle for developing next technology of production system in Korea. In short, the results from this study strongly indicate that the development directions of sustainable agriculture in Korea are 1) to improve new agricultural technology(such as bio- technology) based upon governmental support, 2) to raise the agricultural production price and grounded on compensation principles, 3) to promote efficiency agricultural marketing by agricultural price discrimination, 4) to introduce diversified farming system and to modify land utilization.
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이건열(Lee Gun Yull) 한국지역개발학회 1997 韓國地域開發學會誌 Vol.9 No.3
The government has established agricultural companies to solve a shortage of agricultural labor power, since legal basises were made in 1990. Farmers who are old or lack in labor power have entrusted farming work to the companies and they have accomplished the work in place of old farmers. But many problems are being occurred on account of a lack management ability, a shortage of operating money and inconsistency of agricultural policy etc. As a result of these problems, many agricultural companies are now in financial and managerial difficulties. Accordingly, I intended to search for the real management state and profitability of the companies through financial statement analysis to solve these problems. To attain these goals I visited 70 companies located in Chonnam province with the help of Chonnam provincial government.
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許祥萬,李建烈,李基雄,吳元均 순천대학교 지역개발연구소 1993 地域開發硏究 Vol.4 No.-
At last our agricultural market has been opened to the international competetion, and the approaching implimentation of the Uruguay Round accords and bilateral arrangements with major countries exporting agricultural products are bound to give them wider and eventually all-out access to our local market. One of the most talked about proposals at this juncture is to foster the producers' organization for agricultural products. The concrete measures to do this is as follows. 1. Government have to foster leaders for rural community through the reorganization of existing agricultural colleges and provide collage graduates with the financial support enough to reside in rural area. 2. Local government must foster leaders through the establishment of professional school for aspirants who wants to become agricultural manager but have no chance to get a regular agricultural school education. 3. Farmers who intend to establish the producers' organization to develop a successful strategies for business. 4. Local government or government must make the best of business incubator system which can provide newly emerging producers' organization with the various services, information and financial support etc,.
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윤순석,이건열 한국회계학회 2001 회계학연구 Vol.26 No.4
본 연구는 1995-1997년도에 유상증자를 실시한 249개 기업의 이익조정 여부를 검증하였다. 유상증자기업들의 이익조정 현상을 검증하기 위하여 두 집단의 주요 통제표본을 선정하였으며, 추가분석으로서 제3의 통제집단과 비유상증자기업 모집단과의 비교도 실시하였다. 이익조정을 검증하는 방법으로는 발생액(총발생액과 재량적발생액)의 평균차이 검증, 당기순이익과 영업현금 간의 상관관계 검증, 부호변화율 검증의 세 가지 방법을 이용하였다. 또한 추가적으로 어떤 기업들이 주로 유상증자를 실시하는가를 검토하였으며, 유상증자 전후의 영업성과가 다른지의 여부도 검토하였으며, 재량적발생액을 설명하는 이익조정 유인변수들도 검토하였다. 실증분석 결과 유상증자기업은 대체적으로 증자 실시 전년도에 이익을 증가시키는 경향이 있었다. 특히 유상증자 실시 전년도의 영업현금이 음수인 기업은 이익을 증가시키는 현상이 강한 것으로 나타났다. 한편, 유상증자기업들은 일반적으로 성장률이 높으며, 부채를 더 많이 갚는 회사들이고 또 보고이익을 증가시키는 경향이 있는 것으로 나타났다. 또 유상증자를 전후한 영업성과는 특별한 차이가 없으나 이익조정을 통하여 유상증자 실시 전년도와 실시연도의 보고이익을 높이는 것으로 나타났다. 또한 이익조정을 나타내는 재량적발생액의 대부분을 영업현금이 설명하며, 부채비율과 유상증자율도 유의한 설명력을 가지는 것으로 나타났다.
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