광대역 이동통신 시스템에 적합한 채널추정 기법

박정근,박중후 漢陽大學校 工學技術硏究所 2002 工學技術論文集 Vol.11 No.-

파일럿 심볼을 이용하여 채널추정을 하는 통신시스템에서는 파일럿 심볼이 데이터 심볼과 시간적으로 다중화 되기 때문에 사용할 수 있는 파일럿 심볼의 수가 제한된다. 이러한 상황에서 파일럿 심볼만을 이용한 채널 추정은 일반적으로 좋은 성능을 보장할 수 없다. 최근에 연구되는 PADD(pilot-aided decision-directed) 알고리즘은 채널 추정을 위하여 파일럿 심볼과 데이터 심볼을 모두 사용하기 때문에 페이딩 채널 환경에서 파일럿 심볼만을 이용하여 채널을 추정하는 PA(pilot-aided) 알고리즘보다 우수한 성능을 보여준다. 본 논문에서는 기존의 PADD 알고리즘들을 분석하여 보다 개선된 구조의 PADD 알고리즘 구조를 제안하고 레일레이 다중 경로 페이딩 환경에서 모의실험을 실시하였다. 컴퓨터를 이용한 모의실험 결과를 통해 제안된 알고리즘이 기존의 알고리즘에 비해 성능이 향상됨을 확인할 수 있었다. In the communication systems that employ pilot-acid channel estimation techniques, pilot symbols are time-multiplexed with data symbols, and the number of pilot symbol is usually limited. It is known that PADD(pilot-aided decision-directed) approches exhibit better bit-error ratio (BER) performance than PA (pilot-aided) estimation algorithm over fading channels, because they use both pilot and data symbols for channel estimation. In this paper, conventional PADD algorithm are analyzed and an improved PADD algorithm for pilot symbol-acided channel estimations is proposed. The performance of this algorithm is evaluated in Rayleigh fading environments. Simulation results show that the proposed algorithm has better performance than conventional PADD algorithms.

經濟學 파라다임과 韓國農業問題

朴正根 韓國農業政策學會 1989 농업경영정책연구 Vol.16 No.1

輸入開放에 對應한 中長期 全北地域 農業政策方向에 關한 硏究

朴正根,徐東均 全北大學校 1992 論文集 Vol.34 No.-

This paper attempts to analyze the direction of agricultural polices of Chonbuk region in the trade liberalization and to suggest an alternative regional policy of agricultural development in Chonbuk province. The increasing pressure of agricultural import liberalization from abroad has given great burden to Chonbuk agricultural sector which has lagged behind the average growth of national agriculture. The charactersitics of Chonbuk agriculture can be summarized as wide-spread small scale farming, greater portion of old-aged labor and rice monoculture system. However, the agricultural production sector of Chonbuk becomes more and more commercialized and the consumption patterns of agricultural products become diversified and high-quality oriented continuously. The present situation of Chonbuk agricultural is in a vulnerable state to those changes. Divergent measures in Chonbuk agriculture are urgently requested for the improvement of present production structure. Among these, the increase of Chonbuk local government investment for various in infra-structure of agricultural facilitis should be carried out in such a way that agricultural productivies can be enhansed. Furthermore, it is also important to emphasize on fostering specific activities that develops an appropriate technologies induced by changes of resource endowments.

農業構造變化와 農業金融問題의 再認識

朴正根,崔圭晧 全北大學校 1978 論文集 Vol.20 No.-

This study presents crucial features of structural changes in agriculture and their applications to farm finance problems. The rapid growth of economy since the 1960's in Korea, has accelerated the pace of industrialization and urbanization. Its influences have caused agricultural transformation. The process of structural transformation has been based on the interrelationships between agriculture and industry through the market for capital and labor. The rapid economic development has stimulated a great number of rural people to migrate to large cities, so the number of agricultural workers has begun to decline since 1968. Therefore, in the past, labor was the most important input of agricultural production. Nowadays, because of the shortage of labor, observations concerning the relative changes of resource inputs in agricultural production indicate that capital acts as a major factor in the substitution for labor in the expansion of agricultural output. At the same time, wide-scale substitution of capital for labor has come about because of the technological progress based on labor-saving and capital-augmentation. On the other hand, as economic development continues to increase nation's per capita income, the commodities with higher income-elasticity, which are produced mainly for market by specialized producers have also increased rapidly. Thus, increased technological progress and marketing functions have contributed to structural change, namely, the farmers purchase more of their inputs which, in turn, encourage the changes in the financial structure of the farm sector in Korea. In order to adapt to the rapid structural changes farmers are required to have a larger amounts of capital than they have had in the past, so their liquidity position is increasing. The rapidity with which these developments emerged has created problems with some credit agencies financing farmers. However, it has been generally assumed that in subsistence agriculture rural people are too poor to save, and farm finance problems have received relatively little attention. But now, on the demand side of capital, modernizing agriculture requires large infusions of credit to finance the use of purchased inputs. On the supply side of capital, the experimental data developed in Korea recently showed that rural households have save a significant part of their incomes even though per capita incomes were quite low. This situation indicates that in farm finance Korean agriculture has arrived at the threshold of a new era. The changes in the financial structure of agriculture necessitate us to examine some of the accompanying problems and implications. From the individual farmer's standpoint farm financial management will become more important and will consume a larger proportion of the operator's time. Credit agencies will meet more nearly the challenges of greatly increased credit needs, and must perform the function of transferring savings between sectors, between regions and between income classes. To insure economic progress and an equitable distribution of its profits, policy makers should prepare to create and nurture a strong appropriate institutional program.

全北地域農業活性化方案과 食品加工産業育成戰略

朴正根,申東禾,康昌植 全北大學校 1993 論文集 Vol.36 No.-

This paper attempts to suggest an alternative regional policy of agricultural restructuring and strategies for food processing industry support in Chonbuk. Chonbuk is on the threshold of serious restructuring against the trade liberalization. The increasing pressure of agricultural import liberalization from abroad has given great burden to Chonbuk agricultural sector which has lagged behind the average growth of national agriculture. The challange is to find an orderly process of restructuring that will achieve a more improvement of productivity and stability. This study suggests diversification out of rice monoculture into a multicrop enterprise system as an essential component of agricultural restructuring, induced by the changing relative profitability of rice and nonrice enterprise. The potential for diversification out of rice depends on both physical and economic factors. The profitability of diversification is constrained by both markets and physical infrastructure. Successful transition from rice monoculture to a rice based farming system in Chonbuk should be induced by market forces. The Korean dietary pattern has been changed drastically in parallel with economic growth and the share of processed foods in the daily diet has been increasing over the last decade. Thus, the Chonbuk local government should encourage the growth of the food industry which is projected to continue to grow in the comming years. The structure of the food industry in Korea is lather unique in that small-sized firms produce a greater part of the total output. One major problem facing the small firms in the food industry is that they are often too small to exploit economies of scale in production and marketing. Some small-sized companies are being gradually phased out of business due to shortage of labor and high cost seructure. The expansion of export market is expected to accelerate the development of food industry. In order to keep ahead of competition in export markets, Chonbuk local government should undertake an important role in establishing food combinat to adopt a restructuring and upgrading strategies for food processing industry support.

農産物 輸入開放과 農業問題 : Institutional Approach to Farm Price and Production Structure Policies 價格政策과 生産構造政策에 대한 制度的 接近을 中心으로

朴正根 韓國農業政策學會 1990 농업경영정책연구 Vol.17 No.1

全北農業生産의 成長 分析

朴正根 全北大學校 1977 論文集 Vol.19 No.-

This study attempts to analyize the growth patterns and the changes of agricultural structure in Jeonbug Province over the period from 1958 to 1975. The main objectives of this study have been to estimate the rates of total agricultual output and production of several commodity categories both during the period as a whole and in selected sub-periods. In this study major agricultural products are grouped under the following categories;rice, barleys, miscellaneous cereals, purlses, potatoes, special crops, vegetables, fruits, monopoly products, silkworm cocoons, and livestocks. All of the data which were relevant to this stndy were derived from the statistical year Book of Jeonbug Province from 1959 to 1976. The followings are the major findings. 1. From 1958 to 1975 the Jeonbug agricultural output grew at an annual compound rate of 4.0 percent. The compound annual rate was 7.4 percent from 1958 to 1963, 1.7 percent from 1963 to 1969 and 3.1 percent from 1969 to 1974. 2. If we compare the rates of annual growth of various products, miscellaneous cereals, potatoes and special crops showed unstable swing, while rice, purlses, fruits, vegetables and livestocks increased steadily, and silkworm cocoons and monopoly products have increased most impressibly. 3. It is quite clear that the growth of agricultural output was primarily depended upon the growth of the rice and barleys whose relative contribution accounted for more than one half of the growth of all output. 4. The differences in growth rates of production of the various farm products over the years have altered the relative composition of total agricultural products. With the increase in production of vegetables, fruits and livestocks, the share of rice has decreased. 5. The Location Quotients of rice, monopoly products and silkworm cocoons are more than one and other items show less than one.

최종사용자중심의 DSS실행 성공요인에 관한 연구

박정근 京畿大學校 韓國産業經濟硏究所 1994 産業硏究 Vol.5 No.-

新農政과 農業勞動力問題

朴正根 韓國農業政策學會 1993 농업경영정책연구 Vol.20 No.2

영농체계화연구(FSR)에 의한 전북지역 벼직파재배 농가분석

朴正根,姜昌容 韓國農業政策學會 1994 농업경영정책연구 Vol.21 No.2