• 한국잡초학회지
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• 제18권2호
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• pp.95-105
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• 1998

The positive functions of aquatic and terrestrial weedy plants were reviewed in terms of water purification, soil erosion prevention, salt-affected soil utilization, etc.. Introduced were several examples to utilize weedy plants for environment management by exploiting their positive functions.

• 농업과학연구
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• 제39권4호
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• pp.535-543
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• 2012

Botanic gardens are steadily increasing based on people's increased interests in environment and ecology, lengthened leisure hours and improved transportation. However, similar florae and undifferentiated display are considered as problems, while their functions, purposes and characteristics have been more diversified. This study aims to investigate the present conditions and problems of display at botanic gardens and to find out solutions to make them exhibit plants through various ways of display and have their own characteristic, through a case study of seven botanic gardens. As botanic gardens are being recognized as a cultural institution, they should have limitations in the aspect of places that simply collect and exhibit rare plants. The current problems are unclear setting of design goals and communication with visitors. The gardens should escape from the existing supplier-oriented view to a visitor-oriented view, thinking about what the visitors will be able to see and get there. In particular, their display lacks differency, aesthetics, eye-level display, and multi-layered display. In addition to the essential functions of collecting the world's plants, exhibiting them according to purposes and giving scientific learning, botanic gardens should also show a sense of seasons with plants, trigger interests and amusement through unique plants, make visitors more interested in florae and closer to plants, and include social functions. Botanic gardens should be capable of leaning resources display, speciated display, complex and convergent garden-type display, and display fit for local and cultural contexts.

• 전기학회논문지
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• 제58권3호
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• pp.444-449
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• 2009

This paper introduces a method to establish performance criteria of the in-house power supply system in nuclear power plants. The performance criteria of the system is presented in terms of the number of function failures and amount of the out-of-service time that can be allowed commensurate with the probabilistic safety assessment results of the nuclear power plants. To obtain the performance criteria such as reliability and availability, the functions of the system were analyzed and probabilistic assessment results were utilized. This method provides quantitative guidelines in selecting and monitoring system functions to determine an adequate level of maintenance quality in order to ensure the probabilistic goals for the safety of the nuclear power plants.

• Nuclear Engineering and Technology
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• 제42권5호
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• pp.590-599
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• 2010

Recently, efficient operation and practical management of power plants have become important issues in the nuclear industry. In particular, typical aging parameters such as stress and cumulative usage factor should be determined accurately for continued operation of a nuclear power plant beyond design life. However, most of the major components have been designed via conservative codes based on a 2-D concept, which do not take into account exact boundary conditions and asymmetric geometries. The present paper aims to suggest an effective fatigue evaluation methodology that uses a prototype of the integrated model and its transfer functions. The validity of the integrated 3-D Finite Element (FE) model was proven by comparing the analysis results of individual FE models. Also, mechanical and thermal transfer functions, known as Green's functions, were developed for the integrated model with the standard step input. Finally, the stresses estimated from the transfer functions were compared with those obtained from detailed 3-D FE analyses results at critical locations of the major components. The usefulness of the proposed fatigue evaluation methodology can be maximized by combining it with an on-line monitoring system, and this combination, will enhance the continued operations of old nuclear power plants.

• 인간식물환경학회지
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• 제23권6호
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• pp.603-614
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• 2020

Background and objective: This study was conducted to understand urban residents' perception of indoor plants in order to assist in the preparation of guidelines for growing plants indoors. Methods: Questionnaires were distributed to urban residents currently growing plants or with experience of growing plants. The data of 247 respondents were subjected to analysis to assess their level of interest and ability with regard to growing plants, and their recognition of the selection and function of plants. Results: Respondents showed high interest in growing plants at a level of 6.77, but their ability was moderate. This suggests that information regarding plant maintenance should be provided to urban residents. They recognized the function of plants for improving the environment as important, and expected that indoor plants would improve their mood and visual experience. Satisfaction with growing plants was high from an emotional perspective. They recognized that the function of air purification function was important even if the actual performance or effect was not great. This indicates that the function of air purification should be emphasized more. As the result of the IPA, plants should be selected in consideration of morphological characteristics such as leaf, flower and fruit, and continuously managed to maintain their characteristics. Since the performance of pots was less satisfactory compared to their importance, they should be selected so that they harmonize better with plants and are of the appropriate size to fit the space. The type of plants is an important factor in plant selection in order to perform an environmental function, and the flower color and pot size are important in terms of aesthetics and healing. Conclusion: When horticulture information on indoor plants is provided to urban residents, first, it should be provided to satisfy the functions of the plants required by urban residents and in order to promote and maintain the proper growth of plants. Second, various contents that utilize components should be developed to achieve plant function so that resident can determine the function of plants and select the type, quantity, and shape of plants to achieve the desired function.

• 한국시뮬레이션학회논문지
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• 제10권4호
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• pp.1-10
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• 2001

For the simulation of piping vibrations in petrochemical plants, forcing functions mainly depend upon the equipment working mechanism and vibration resources in the piping systems. In general, harmonic function is used to simulate rotary equipment. Mechanical driving frequencies, wave functions, and response spectrum are used to simulate reciprocating compressors, surge vibration of long transfer piping, and seismic/wind vibration, respectively. In this study, the general suggestions for forcing functions were reviewed and proposed the forcing function to simulate the spray injection system inside the pipe in which two different fluids are distributed uniformly. To confirm the results, the scheme was applied for a real piping system. The vibration mode of the real system was consistent with the 4th mode (26.725 Hz) obtained by simulation using the forcing function presented in this study.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1986년도 하계학술대회논문집
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• pp.286-289
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• 1986

Power plants are being met by integrating more functions into fewer displays and control devices. The trend toward more efficient man/machine interface, together with developments in distributed type systems, could lead to simplicity of the control benchboard.

• 전자공학회논문지CI
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• 제49권2호
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• pp.115-122
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• 2012

본 논문에서는 CosGauss라고 하는 코사인함수로 모듈화 된 가우시안 활성화함수가 뉴로 네트워크에서 다항식과 계단함수의 근사에 사용될 수 있음을 증명한다. CosGauss 함수는 시그모이드, 하이퍼볼릭 탄젠트, 가우시안 활성화 함수보다 더 많은 범프(bump)를 구성 할 수 있다. 이 함수를 캐스케이드 코릴레이션 뉴로 네트워크 학습에 사용하여 벤치마크 문제인 Tic-Tac-Toe 게임과 아이리스(iris) 식물 문제와 실험하고 여기에서 얻어진 결과를 다른 활성화 함수를 사용한 결과와 비교 분석한다.

• 한국동물학회:학술대회논문집
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• 한국동물학회 1997년도 한국생물과학협회 학술발표대회
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• pp.68-69
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• 1997

No Abstract, See Full Text

• 생명과학회지
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• 제33권11호
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• pp.956-965
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• 2023

CCCH zinc finger 단백질은 세 개의 시스테인(cysteine, C) 아미노산과 한 개의 히스티딘(histidine, H) 아미노산으로 구성된 아연이온(Zn⁺)에 결합하는 손가락 구조의 zinc finger 모티프를 가졌으며, 식물에는 많은 수의 CCCH zinc finger 단백질 유전자가 존재한다. CCCH zinc finger 단백질은 2개의 CCCH zinc finger 모티프를 가지는 TZF와 그 외 나머지인 non-TZF로 구분이 되지만 지금까지의 CCCH zinc finger 단백질의 기능에 대한 연구는 주로 TZF, 특히 식물 특이적으로 존재하는 RR-TZF를 중심으로 이루어져 왔다. 그러나 최근 들어 non-TZF 유전자에 대한 연구도 활발히 진행되고 있다. Non-TZF는 생물 스트레스와 고염, 건조, 저온, 고온, 산화 스트레스 등 다양한 환경 스트레스 반응에 관여하는 것으로 알려졌다. Non-TZF는 다양한 방식으로 하위 유전자를 조절하여 식물의 스트레스 반응에 관여하는데, 세포질에 위치하며 RNA에 결합하여 RNA의 안정성을 조절하고 전사 후 단계에서 하위 유전자를 조절하거나 핵에 위치하고 전사 활성화 또는 전사 억제를 통해 전사인자로서 기능을 하기도 한다. 그러나 이러한 연구에도 불구하고 non-TZF를 통한 스트레스 신호전달 경로 및 상위 유전자, 하위 유전자는 거의 알려져 있지 않다. 따라서 CCCH zinc finger 유전자에 대한 이해를 넓히기 위해서는 TZF뿐만 아니라 non-TZF 유전자의 스트레스 반응에 관한 지속적이고도 집중적인 연구가 필요하다. 본 총설 논문에서는 지금까지 스트레스 반응 조절에 관여하는 것으로 밝혀진 non-TZF 유전자들과 그 유전자들의 분자적 기능을 서술하였다.