• Journal of the Korean Society for Geothermal and Hydrothermal Energy
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• v.13 no.3
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• pp.1-8
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• 2017

Variable refrigerant flow (VRF) systems have recently attracted attention in many countries due to a variety of advantages over conventional system. Especially, the water-cooled VRF heat pump, including geothermal heat pump, is a system that accurately controls the flow rate of refrigerant for the improved efficiency under part load operation. This paper describe the process of generating the cooling and heating energy performance curve coefficients and performance expressions for modeling water cooled VRF system using EnergyPlus. Through this study, the process for generating performance curves can be implemented into EnergyPlus or other comparable building energy analysis tools for the long-term evaluation of heat pump under dynamic conditions.

• Journal of Korean Society of Steel Construction
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• v.11 no.3 s.40
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• pp.311-318
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• 1999

Concrete filled tubular(CFT) members have many structural and constructional advantages. The prefabrication of CFT members can be thought an idea for the good qualify control of concrete. The objective of this study is to suggest the construction method of prefab CFT beam-columns. Tests are performed to understand their structural behaviors. The opening space between prefab CFT members and the size of tubular members are the parameters of this study. The results of this study will be based on the suggestion of prefab CFT.

• Journal of Advanced Navigation Technology
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• v.14 no.5
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• pp.697-709
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• 2010

The patrol robot is a typical extreme robot for the military use. It helps soldiers by detecting and informing a potential risk instead, and warning earlier. Also, these kinds of extreme robots need good ability to conquest rough road. In this paper, we studied new mechanism through which we can get high speed on the flat road with round shape wheels, and simultaneously can get good ability to overcome rough road with blade-shape wheels. The shape of the wheels is being self-adaptively changed automatically according to the condition of the road without using additional actuator.

• Journal of Digital Convergence
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• v.14 no.8
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• pp.555-564
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• 2016

Space perception is generally treated as a problem relevant to the ability to recognize objects. Alternatively, the data from shape perception studies contributes to discussions about the geometry of visual space. This geometry is generally acknowledged not to be Euclidian, but instead, elliptical, hyperbolic or affine, which is to say, something that admits the distortions found in so many shape perception studies. The purpose of this review article is to understand perceived shape and the geometry of visual space in the context of visually guided action. Thus, two prominent approaches that explain the relation between perception and action were compared. It is important to understand the fundamental information of how human perceive visual space and perform visually guided action for the convergence on embodied cognition, and further on artificial intelligence researches.

• Journal of the Korea Concrete Institute
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• v.22 no.2
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• pp.187-197
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• 2010

The longitudinal reinforcement ratio for the performance-based design of columns was studied. Unlike the existing design codes using uniform minimum reinforcement ratio and effective stiffness for all columns, the longitudinal reinforcement ratio of columns was defined as the function of various design parameters. To evaluate the minimum reinforcement ratio, two conditions were considered: 1) prevention of passive yielding of compression re-bars due to the creep and shrinkage of concrete under sustained service loads; and 2) ultimate flexural strength greater than the cracking moment capacity to maintain the ductility of columns for earthquake design. In addition, the effective flexural stiffness of columns for structural analysis was determined according to the longitudinal reinforcement ratio. The design method addressing the three criteria was proposed. The proposed method was applied to a design example.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.05a
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• pp.677-678
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• 2017

Currently, vocational high schools are trying to learn through project learning and similar courses. This is to nurture talented students who can be directly involved in the industrial field. In this study, we modified the existing ADDIE model, designed the model for the class, and operated the actual augmented reality programming class to verify the validity. As a result of the operation, the learners' satisfaction and achievement were high, and the ability to solve the problem was improved as it was developed in the actual field. In this study, it is meaningful to develop a teaching model closely related to the field through the project learning using the augmented reality programming.

• Annual Conference on Human and Language Technology
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• 2021.10a
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• pp.36-40
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• 2021

다양한 Masked Language Modeling을 통해 학습한 사전 학습 모델들은 질의응답 시스템에서 매우 높은 성능을 보여주고 있다. 이러한 강력한 성능에도 불구하고 그러한 모델들이 질의를 정확히 이해하고 정답을 예측하는 것인지, 혹은 질의에 등장하는 특정 단어와 잘 나타나는 단어들을 기반으로 정답을 예측하는 것인지에 대한 분석은 아직 충분하지 않다. 이러한 사전학습 모델의 질의 이해 능력을 밝히기 위하여, 본 연구에서는 클레버 한스 테스트를 제안한다. 클레버 한스 테스트에서는 의미적 구조적, 의도 유무 측면의 여러 질의 변형이 된 데이터 셋들이 포함되어 있다. 본 연구에서는 클레버 한스 테스트를 통하여 사전학습 모델들이 의미적으로 달라진 질의나 의도가 제거된 질의를 입력으로 받아도 성능이 크게 떨어지지 않는 것을 확인하였고 모델의 질의 이해능력 부족을 실험적으로 시사하였다.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.1137-1144
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• 2009

Creativity, the ability to produce through imaginative skill, is pursued by all designers. However, originality does not refer to absolute novelty. In this age, information is shared and disseminated. Creation of works is an activity to re-establish all shared information and reorganize relationship among things. Therefore, a new design is a product of reorganization rather than originality. Moreover, designers can generate ideas different from each other because they individually espouse different system of knowledge. From such perspective, a very important task of designers is to explore methods of expanding design thinking that can enhance the ability to new connection among things in the process of assimilation and modification. The task can be carried out by identifying characteristics and limits of their unique system of knowledge. Therefore, it is necessary to seek methods of expanding design thinking for efficient cognitive activities. In explaining human knowledge, this study applied semantic network, a method used in cognitive science for creating structure, and the method of expanding design thought was proposed by corresponding method of design conceptualization. By organizing, categorizing, and flexibly combining and modifying the methods of design thinking conceptualization and expansion generated by this study, strengths of each method were enhanced and limits of each method were overcome to enable more effective design thinking. In this study, the method of expansion was used when connecting of nodes cannot be sustained after using each method of conceptualization. By avoiding unique method of thinking through diversification and vitalization of conditional points, efficient design thinking was achieved. The value of this study lies in the fact that the proposed method of expanding thinking using the mechanism of network enhances the ability to establish new connections in the process of assimilation and modification.

• Journal of the Korean Society of Radiology
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• v.10 no.6
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• pp.387-393
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• 2016

Tumor using the efficient concomitant radiotherapy and chemotherapy to remove, prior to surgery and, either reduce the size of the tumor after surgery, or was can be made smaller, Or excised tumor, in a way to be removed, most conventional surgical method is surgical excision surgery therapy. And methods reduce or tumor size, or smaller, chemotherapy can kill tumor is administered selectively anticancer agent which increases the radioactive susceptible to tumor cells, sensitive to susceptibility to radiation are those which make it possible to respond to, either TRAIL methods of various biological cytostatic can deform the protein, by deforming the structure of the protein help to cell death it is known. In this paper, the HCT-116 cells thought to be a cancer cell to analyze the interaction of TRAIL and radiation. Experimental results, single use of TRAIL and radiation, results were compared with the control group, it was found to have no significant effect on each cell proliferation and apoptosis. Conversely treated with TRAIL, when treated in parallel radiation, it was possible to know that the HCT-116 cells significantly apoptosis occurs, The proportion of G1 ratio G0 also was found to have increased. TRAIL conclusion is increased apoptosis radiation defensive cells can know that increased radiosensitivity, also possible to alter the cell cycle, reduce cell proliferation ability stepwise it was possible. TRAIL is increased apoptosis, decreased cell proliferative capacity, it is considered to be possible to use as a radiation sensitizer.

• Journal of the Korea Concrete Institute
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• v.19 no.5
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• pp.529-537
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• 2007

The purpose of this study is to discuss how strength and ductility of each system in low-rise reinforced concrete buildings composed of extremely brittle, shear and flexural failure lateral-load resisting systems have influence on seismic capacities of the overall system, which is based on nonlinear seismic response analyses of single-degree-of-freedom structural systems. In order to simulate the triple lateral-load resisting system, structures are idealized as a parallel combination of two modified origin-oriented hysteretic models and a degrading trilinear hysteretic model that fail primarily in extremely brittle, shear and flexure, respectively. Stiffness properties of three models are varied in terms of story shear coefficients, and structures are subjected to various ground motion components. By analyzing these systems, interaction curves of demand strengths of the triple system for various levels of ductility factors are finally derived for practical purposes. The result indicates that demand strength levels derived can be used as a basic information for seismic evaluation and design criteria of low-rise reinforced concrete buildings having the triple lateral-load resisting system.