RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      선택해제
      • 좁혀본 항목 보기순서

        • 원문유무
        • 음성지원유무
        • 원문제공처
          펼치기
        • 등재정보
          펼치기
        • 학술지명
          펼치기
        • 주제분류
          펼치기
        • 발행연도
          펼치기
        • 작성언어
        • 저자
          펼치기

      오늘 본 자료

      • 오늘 본 자료가 없습니다.
      더보기
      • 무료
      • 기관 내 무료
      • 유료
      • KCI등재
      • 분류 벡터 양자화 및 DPCM을 이용한 블럭 웨이브릿 변환 영상 부호화

        김영춘,정원식,이건일,김경규,이승진 경북대학교 전자기술연구소 1997 電子技術硏究誌 Vol.18 No.1

        In this paper, we propose a block wavelet transform coding of images using classified vector quantization to exploit the inter-band correlation and to eliminate the blurring effect at a smoothly changed edge. In this scheme, DWT coefficients are rearranged to compose the small blocks, which are made up of the corresponding coefficients from all the subbands. These blocks are classified into four classes relying on the directional energies of the second level subband along each direction to eliminate the blurring effect. These are further divided adaptively into subvectors depending on the DWT coefficient statistics as this allows efficient distribution of bits. The subvectors are then vector quantized and DPCM is applied to DC coefficients. Simulation results show that this coding scheme performs a good result compared to other approaches.

      • 차세대 전투기 Sensor Pod 장착 위치 선정에 관한 연구

        김영춘,양청일,양창건,신항철 한국항공우주학회 2016 한국항공우주학회 학술발표회 논문집 Vol.2016 No.4

        미래의 항공기는 다양한 시스템들이 복잡한 구조로 구성되어 있으며 각 시스템들이 유기적으로 동작할 때 비로소 그 목적에 맞게 운영될 수 있다. 이런 다양하고 복잡한 시스템들로 구성된 차세대 항공기를 개발하는 과정 중, 항공기 외부에 장착되는 센서의 성능을 극대화하기 위한 위치 선정은 중요한 과정이다. 본 논문은 저고도 침투를 통한 정밀 타격 임무 수행에 필수적인 Navigation Pod 와 EO Targeting Pod 에 대해 Obscuration 해석 프로그램을 통한 LOS Blockage 분석과 항공기 체계 통합요구사항 검토를 통해 최적의 장착 위치 선정에 관해 연구하였다. The future aircraft is composed of the various systems which are complicated structure and can be operating when each system are operating organically. In the development process for next generation aircraft consisting of these various and complicated system, the analysis the operating requirement to install on the optimal position of the aircraft is the essential process in order to maximize the unique performance of subsystem. In this study, we researched optimized position through LOS blockage analysis using the obscuration analysis program and review aircraft system integration requirement regarding Navigation Pod and EO Targeting Pod that is the essential equipment to the low altitude ingress and precision attack mission.

      • 輸出自律規制의 經濟的 效果에 관한 實證的 分析

        金永春 제주대학교 1994 논문집 Vol.39 No.1

        This paper studies the economy theoretical effects and empirical analysis of voluntary export restraints(VER), especially the impact of the VERs on U.S. textiles, steels and autos. In recent years import countries interested in protecting domestic industries from import competition have gradually shifted from the use of general tariff restricitions to voluntary export restraints among non-tariff barriers. Despite the efforts of the GATT members to eliminate the elenlents of both discrimination and quantitative restricitions from the trade policies of its contracting parties, these features obstinately persist in the form of voluntary export restraints. The preference for voluntary export restraints may result from the fact that there may concern political economic issues in importing and exporting countries. The preference of voluntary export restraint agreement is that exports can be bought off and the patterns of decision making which are entailed reduce the political cost of protection. Neither economic nor political arguments can be found to convinicingly justify the use of VERs. From an economic point of view it is obvious that VERs are inferior to the global, non-discriminating tariff measures. In order to facilitate a negotiated restriction on exports, VERs contain built-in compensation for the exporter in that they allow exporters to raise the price ef the export goods and thereby capture a portion of the scarcity premium associated with the trade restriction. For this reason, domestic consumers lose more from VERs than from import tariffs and empirical studies have documented their heavy economic welfare cost. Voluntary Erport Restraints have been shown to raise prices and profits of both the domestic and foriegn firm since they have effects like those of a regime change when goods are substitutes for one anther An argument which might be made for VERs with substitute goods is that while a VER lowers comsumer welfare by raising prices, it also raise the profits of domestic producers(short-term aspects). However, in the long-term, welfare effect of importing countries, restricted exporting, unrestricted exporting countries must be lower because VERs resulted from disortion of international allocation resources, and quantitative measures hinder the movement of relative prices between the domestic economy and the world market. Finally, any progress towards the elimination of VERs as an instrument of trade policy will require domestic policies that diminish the motives for protectionism in general. Internal measures to promote the mobility of labor and other resources across industries and regions, along with policies supporting the process of adjustment to international competition, would prevent the conditions that so often lead to protectionist policies. Stronger efforts to educate the public on the issues would also help, especially if the cost of specific protectionist policies to consumers, including the transfers to foreign and domestic producers, were a matter of public record.

      • 한국 상업교육의 문제점과 개선방향에 관한 연구

        김영춘 제주대학교 사범대학 1999 백록논총 Vol.1 No.-

        The purpose of this study trys to find a solution to a problem in business education in secondary schools in Korea. Business education as a vocational education has been developed and ecpended in quality and quantity as the resulted high economic growth Today, kthe industrialized society environment is rapidly changing It has been progressing through high economic growth and highly mechanicalization. In accordance with changes in society circumstances. business education is at a critical condition. Therefore, the business education must get over a crisis. In order to solve the problems of business education, lthe following improvements are needed: First, business education should be improved with applications of teache's teaching-learning methods relevant to the contents and goal of program, and development of instructional based on the level of student's mental ability. Second, most of students choose to enter the commercia high school because of their impecunious grades. Therefore, lthey should be rihgtly taught the education related with jobs in school so that they can get a job after graduation with sound view of job. Third, restructuring the business education system, strengthening the efficiency and diversity of curriculum in business education,and improving perceptions of society on business education are needed for successful business education. Therefore, commercial high school education needs to overcome the obstacles and challenges.

      • 入試準備 中高等學生의 體力 및 病勞에 關한 硏究

        金永春 우석대학교 의과대학 1971 우석의대잡지 Vol.8 No.1

        Korean students are very much exhausted physically and mentally during the preparatory period for the competitive entrance examination in order to be admitted into higher educational institutions. This study was made of comparative measurements of physical strength and degree of fatigue of the students before and after the graduation examination. The study groups were consisted of 247 middle school students (123 boys and 124 girls) and 248 high school students (125 boys and 123 girls). The degree of fatigue was measured by the subjective fatigue questionare method on subjective complains as well as by the objective method including Kraepelin mental work test, esthesiometry, position sense, grasping and lifting power. The physical growth and strength of the students were observed by measurement of various physical indices including relative weight, relative chest-girth, relative sitting-height, Rohrer index, Kaup index, Vervaeck index and visual acuity. The results are summarized as follows: 1. All the biometric indices of the students in preparation for the entrance examination were lower than the standard averages for the respective age groups of the Korean. 2. The incidence of myopia was higher in the high school students than in the middle school. On the average, male students were more susceptible to myopia. 3. The subjective symptoms of fatigue were more appearent after the examination and mental symptoms were the most common signs and followed by neurosensory and physical signs. 4. The result of Kraepelin mental test revealed that the students manifested themselves with a typical fatigue curve before and after the examination. The curve indicated more fatigue after the examination. 5. Abnormal position sense was more frequent after the examination. Esthesiometric values significantly increased in the post-examination period and the values for the girl students were higher than boys. 6. Both grasping and lifting powers slightly decreased in the post-examination period. 7. The students who were taking analeptic preparations complained more subjective symptoms. The 18.4% of the high school students and the 23.0% of the middle students were taking analeptics during the examination period.

      연관 검색어 추천

      이 검색어로 많이 본 자료

      활용도 높은 자료

      해외이동버튼