• Plant Resources
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• 제6권1호
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• pp.16-26
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• 2003

Molecular markers are useful tools for evaluating genetic diversity and determining cultivar identity. Present study was conducted to evaluate the genetic diversity within a diverse collection of rice accessions used for Korean breeding programs. Two hundred eighty-seven rice cultivars, composed of temperate japonica, tropical japonica, indica, and Tongil-type of Korean crossing parents were evaluated by means of 15 simple sequence repeat (SSR) markers. A total of 99 alleles were detected, and the number of alleles per marker ranged from 4 to 11, with an average of 6.6 per locus. Polymorphism information content (PIC) for each of the SSR markers ranged from 0.2924 to 0.8102 with an average of 0.5785. These results, with the result that use of only 15 SSR markers made all rice cultivars examined could be uniquely distinguished, imply the efficiency of SSR markers for analysis of genetic diversity in rice. Cluster analysis was performed on similar coefficient matrics calculated from SSR markers to generate a dendogram in which two major groups corresponding to japonica (Group I) and indica and Tongil type rice (group II) with additional subclasses within both major groups. The narrowness of the Korean breeding germplasm was revealed by the fact that most of the Korean-bred and Japan-bred temperate japonica cultivars were concentrated into only 2 of the sub-group I-1 (143 cultivars) and I-2 (58 cultivars) among six sub-groups in major group of japonica. This is because of the japonica accessions used in this study was a very closely related ones because of frequent sharing of the crossing parents with similar genetic background with synergy effect of the inherited genetic difference between indica and japonica. A rice breeding strategy with the use of molecular markers was discussed for overcoming of genetic vulnerability owing to this genetic narrowness.

• 한국환경과학회지
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• 제8권5호
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• pp.587-592
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• 1999

The purpose of this study was to identify the controlling factors to construct tidal flat ecosystems having similar characteristics as natural ones. We transplanted the soil in a constructed tidal flat to a natural one and vice versa. Parameters monitored after these transplantations were silt content, organic matter, bacterial population and oxidation-reduction potential. Moreover, the relationship among silt content, organic matter and bacterial population was investigated by laboratory column experiment. The silt content, organic matter, bacterial population and vertical profile of oxidation-reduction potential in the soil transplanted from the constructed tidal flat to the natural one changed to similar values to those in the natural one. On the contrary, all the parameters for the soil transplanted from the natural tidal flat to the constructed one changed to similar values as those in the constructed one. The silt contents in thses two transplanted solis were in proportion to the organic carbon contents and bacterial population. Similarly, the bacterial population in laboratory column experiment increased with the increase in silt and organic matter contents. It seemed to be important to select a place to enhance accumulative of silt and/or to maintain the silt content by hydrodynamic control of seawater in order to construct a tidal flat having similar characteristics as natural one.

• 한국작물학회지
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• 제39권2호
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• pp.171-174
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• 1994

콩 비린내에 관여하는 lipoxygenase가 결핍된 계통들의 가공적성 및 제품개발의 타당성을 알아보고자 두부와 두유제조시 일반콩과의 특성을 비교 검토한 바 그 결과는 다음과 같다. 1. 두부 제조시 lipoxygenase가 일부 결핍된 수원169호는 일반콩인 황금콩에 비해 수율 및 색도는 비슷하였으나 관능검사는 높게 평가되었다. 2. 두부의 일반조성도 공시재료간에는 비슷하였으나 수원169호가 황금콩에 비해 총당 함량은 높게 나타났다. 3. 실험실 규모에서 두유 제조후 관능검사를 실시한 결과 lipoxygenase 결핍계통이 향기 및 맛에서 우수한 것으로 평가되었다. 4. 공장 규모의 두유제조에서도 수원169호가 황금콩에 비해 두유 가공적성이 우수하였다.

• 농촌지도와개발
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• 제14권1호
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• pp.59-91
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• 2007

The objectives of this study were 1) to explore the present status of extension services of agricultural experiment station, and 2) to get some implications for ameliorating extension services of agricultural experiment station. The data were collected through the semi-constructed interviews with 11 agricultural researchers in 6 local agricultural experiment stations and 11 farmers who have ever made contact with the researchers. The major findings of this study were as follows: The agricultural experiment stations were providing extension services as expedients to accommodate to new markets and structural changes of organizations, though they are originally research-oriented agencies. The extension methods of agricultural experiment stations were similar with those of extension agencies, and the extension methods used mainly were 'experiment plot demonstration exhibition', 'consultation using telephone, internet, face to face meeting', 'visiting farms and consulting'. These were generally carried out by farmer's request, therefore the extension services of agricultural experiment stations were provided in a passive way so far. Based on the results of this study, the followings are recommended for further development of extension services of agricultural experiment station: The rural development organizations should set principles and support for extension services of agricultural experiment stations. The alternative plans to strengthen the linkage between research and extension have to be made, and these plans should include financial, personnel and systematic arrangements for further development of extension services of agricultural experiment stations.

• 인지과학
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• 제26권3호
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• pp.263-278
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• 2015

국립국어원의 온라인가나다 서비스는 한국어에 대한 질문을 등록하면 전문가가 답변을 작성하는 인터넷 서비스이다. 이러한 서비스는 유사한 질문이 자주 등록되는 문제점이 있다, 만일 새롭게 등록되는 질문과 유사한 질문을 자동으로 찾아 그 질문에 대한 답변을 등록 즉시 제공한다면, 질문자는 빠른 시간에 답변을 얻을 수 있고 서비스 관리자는 수동 답변 작성의 부담을 덜 수 있다. 본 논문에서는 온라인가나다의 특성을 분석하여 자주 질문되는 다섯 개의 주제 분류를 설정하고, 주제 분류 유사도와 함께 음소와 음절단위 수열유사도와 벡터 유사도를 결합하여 유사한 질문을 검색하는 시스템을 제안한다. 평가에서는 본 논문에서 제시한 주제 분류 정보를 활용하여 검색 정확률이 향상되는 결과를 얻었다. 최종 실험에서는 Mean Reciprocal Rank(MRR)가 0.756, 정답이 1위와 5위내에 검색될 확률은 각각 68.31%, 87.32%를 보였다.

• 농촌계획
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• 제12권4호
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• pp.99-114
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• 2006

Under awareness of the importance of interaction between local research agencies and farmers in developing local agriculture, this study attempts to analyse the level of interaction in extension services of Experiment Station. The data were collected through the interview with researchers in five Experiment Stations and farmers who have made contact with the researchers. The results of the analysis are as follow: (1) The Experiment Stations are currently providing extension services though they are originally research-oriented agencies. The extension methods of Experiment Stations are similar with those of extension agencies. (2) The more systematic the characteristic of extension service type is, the higher level of interaction is generated with several exceptions which should not be ignored. This study accentuates the efforts to improve the level of interaction as well as to construct a system as a linked set of actors.

• International Journal of Concrete Structures and Materials
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• 제18권3E호
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• pp.173-181
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• 2006

The objectives of this study are to evaluate the reliability of an existing nonlinear analysis program for predicting the inelastic behavior of reinforced concrete frame with seismic details and to observe the redistribution of the internal forces, which can not be easily measured by an experiment. In order to carry out this task, the nonlinear analysis program of IDARC 2D(3) was run on a 2-bay, 2-story moment-resisting reinforced concrete plane frame with seismic details. (1) The effort to obtain the results of the analysis similar to those of experiment was made by determining the appropriate values of model parameters. The comparison of the analysis results with those of experiment and the observation of the distribution of internal forces obtained through nonlinear analysis points to the following conclusions. (1) The overall relationship between lateral load and lateral displacement given by the analysis is similar to that of experiment. However, the values of initial stiffness and the amount of energy dissipation in the initial displacement steps given by the analysis show larger values than those of experiment. (2) The analysis provided detailed information on the distribution and redistribution of internal forces and proved useful in elucidating the crack pattern, the sequence of the occurrence of plastic hinges, and the failure or yielding mechanism for the whole structure. (3) In spite of the similarity in overall behavior of analysis and experiment, there exists a significant discrepancy in some local behaviors. Furthermore, the hysteresis in the relationship between moment and curvature in some column ends have shown sudden deteriorations in strength, which can not be interpreted satisfactorily at the present time. Therefore, it is necessary to develop a better analytical model to fill this knowledge gap.

• 한국수정란이식학회지
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• 제28권1호
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• pp.13-18
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• 2013

The increase in the meat quality and milk production of cows, which breed Korean Native Cow (KNC) and Holstein cow, is not improving reproductive efficiency. In this study, we examined the effect of interferon (IFN) supplementation on motility of frozen-thawed semen and pregnancy rate after artificial insemination of KNC and Holstein cow. In experiment 1, we investigated the effect of IFN-tau concentration (10,000 IU and 20,000 IU) on the percentage of total motility (TM) and progressive motility (PM) of frozen-thawed spermatozoa. In experiment 2, KNC were infused 20,000 IU IFN-tau at insemination or after insemination. In experiment 3, KNC or Holstein cow were inseminated with frozen-thawed semen and infused 20,000 IU IFN-gamma or -tau after insemination. In experiment 1, the average of TM (23.9% to 30.9%) and PM (18.5% to 21.9%) were similar between control and treatments. In experiment 2, the pregnancy rates of IFN infusing times were not different from 45.8% to 53.6%. In experiment 3, the pregnancy rates of Holstein cow infused different kinds of IFN were similar (control, IFN-gamma, IFN-tau; 42.9%, 40.5%, 48.0%). In the case of KNC, however, the pregnancy rate of control was 55.6%, which was significantly lower than that of IFN-gamma (68.9%; p<0.05). Thus, IFN is effective on the improvement of reproductive efficiency, but further study is needed.

• 한국항공운항학회지
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• 제18권1호
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• pp.51-57
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• 2010

This study was to analyze the difference in pilot error by using the Signal Detection Theory. The task was to detect the targeted aircraft(signal) which is different shape from many other aircraft(noise). From the two experiments, we differentiated the task difficulty followed by change in noise stimuli. Experiment 1 was to search the signal stimuli(fighter plane) while the noise stimuli(cargo plane) were increasing. The results from the Experiment 1 showed the tendency to decrease the hit rate by increasing the number of noise stimuli. However, the false alarm rate was not increased. The sensitivity(d') showed quite high. In Experiment 2, a disturbance stimulus(helicopter) was added to noise stimuli. The result was generally similar to those of Experiment 1. However, the hit rate was lower than that of Experiment 1.

• 한국환경과학회지
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• 제7권5호
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• pp.725-733
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• 1998

Three numerical experiments are done using IAP(Institute of Atmospheric Physics) global spectral model(T42L9) to investigate the influence of the surface temperatures on the 7-day simulation. Particularly, the response of the subtropical High in summer to the variation of soil temperature and sea surface temperature(SST) was emphasized through a series of experiments. Experiment 1 uses the June climate data as the earth surface conditions. Experiment 2 is similar to Experiment 1 except for the soil surface temperature. Experiment 3 is the same as Experiment 1 except for the modified SST, which is much warmer than the June climate SST on the sea around the Korean peninsula. The main finding in 7-day simulation is that the response of the subtropical high in summer to the variation of the sell surface temperature was much more than that to the variation of the SST. It is implied that the proper treatment of sell surface temperature is more important than that of the SST for the better 7-day simulation of the subtropical high in summer.