• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1126-1129
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• 2003

In this paper, we propose a multi-agent system for assisting those who need help in taking objects around him/her. One may imagine this kind of situation when a person is lying in bed and wishes to take an object on a distant table that cannot be reached only by stretching his/her hand. The proposed multi-agent system is composed of three main independent agents; a vision agent, a robot agent, and a pass agent. Once a human expresses his/her intention by pointing to a particular object using his/her hand and a finger, these agents cooperatively bring the object to him/her. Natural communication between a human and the multi-agent system is realized in this way. Performance of the proposed system is demonstrated in an experiment, in which a human intends to take one of the four objects on the floor and the three agents successfully cooperate to find out the object and to bring it to the human.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.1100-1101
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• 2008

After lamination process, Isc is increased by sheet reflection. This paper presents the electrical output characteristics by back sheet reflection. The experiments was conducted by using single crystalline and multi crystalline PV module. The reflection area of single crystalline PV module is larger than multi one due to the difference of solar cell manufacturing. The experiments show that the increased performance ratio of single crystalline PV module output power is 1.55% rather than that of multi crystalline PV module output power is 1.13%. In addition, it is expected that the output power of single one rather than multi-one is increased by the lower temperature when the PV module is installed outside. The results can be reconsidered by the test material and test process. Back sheet used for humidity prevention makes PV module output power increasing.

• 대한영상의학회지
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• 제83권6호
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• pp.1208-1218
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• 2022

최근, 의료 분야에서 인공지능은 많은 발전을 통해 다양한 분야로 확장하며 활용되고 있다. 하지만 대부분의 인공지능 기술들은 하나의 모델이 하나의 태스크만을 수행할 수 있도록 개발되고 있으며, 이는 의사들의 복잡한 판독 과정을 인공지능으로 설계하는데 한계로 작용한다. 멀티 태스크 러닝은 이러한 한계를 극복하기 위한 최적의 방안으로 알려져 있다. 다양한 태스크들을 동시에 하나의 모델로 학습함으로써, 효율적이고 일반화에 유리한 모델을 만들수 있다. 본 종설에서는 멀티 태스크 러닝에 대한 개념과 종류, 유사 개념 등에 대해 알아보고, 연구 사례들을 통해 의료 분야에서의 멀티 태스크 러닝의 활용 현황과 향후 가능성을 살펴보고자 한다.

• 한국해양공학회지
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• 제12권1호
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• pp.135-142
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• 1998

In this study, the frequency transfer function of motions are predicted from the result of a full-scale seakeeping trials. Because the real sea has the characteristics of multi-directional waves,we compare the results in the one directional waves with ones in the directional waves. For calculation of the frequency transfer function in the directional waves, Takezawa's inverse estimation method was introduced and the frequency ranges were divided into three parts in order to consider following seas. The full-scale seakeeping trials was executed in the south sea of Korea using the stern trawler. Those results show that analysis method of the multi-directional waves is more reliable than that of one directional waves, and confirm the possibility of applying this method to the full-scale seakeeping trials.

• Structural Engineering and Mechanics
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• 제16권5호
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• pp.597-612
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• 2003

In this paper, multi-story buildings with shear-wall structures and with narrow rectangular plane configuration are modeled as a multi-step flexural-shear plate with varying cross-section for buckling analysis. The governing differential equation of such a plate is established. Using appropriate transformations, the equation is reduced to analytically solvable equations by selecting suitable expressions of the distribution of stiffness. The exact solutions for buckling of such a one-step flexural-shear plate with variable stiffness are derived for several cases. A new exact approach that combines the transfer matrix method and closed from solution of one-step flexural-shear plate with continuously varying stiffness is presented for stability analysis of multi-step non-uniform flexural-shear plate. A numerical example shows that the present methods are easy to implement and efficient.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2001년도 학술발표대회논문집
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• pp.33-38
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• 2001

The types of the multi-family housing are classified into the independent type, the mixed type and the public type by the approaching method. The characteristics of the independent type are the rear layout type(41.66%), the "ㅋ"type(56.14%), and the 2-room type(54.54%). In the mixed one, they are the front layout type(36.84%), the "ㄱ"type(42.10%), and the 1-room type(49.60%) and in the public one they are the front layout type(51.61%), the "ㅡ"type(41.99%). and the 1-room type(84.11%). It is found that the housing types are gradually tuned into the multi-family housing such as the independent house in the urban area due to changing the major independent type(82.60%) in the early of the 1990s to the public type(74.19%) in the end of the 1990s.

• Journal of the Korean Statistical Society
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• 제32권3호
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• pp.245-259
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• 2003

The 2-way balanced one-level rotation design has been discussed (Park et al., 2001), where the 2-way balancing is done on interview time in monthly sample and rotation group. We extend it to 3-way balanced multi-level design to obtain more information of the same sample unit for one or more previous months. The 3-way balancing is accomplished not only on interview time in monthly sample and rotation group but also on recall time as well. The 3-way balancing eliminates or reduces any bias arising from unbalanced interview time, rotation group and recall time, and all rotation groups are equally represented in the monthly sample. We present the rule and rotation algorithm which guarantee the 3-way balancing. In particular, we specify the necessary and sufficient condition for the 3-way balanced multi-level rotation design.

• 대한음성학회지:말소리
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• 제60호
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• pp.191-201
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• 2006

Discrimination between speech and music is important in many multimedia applications. Previously we proposed a new parameter for speech/music discrimination, the mean of minimum cepstral distances (MMCD), and it outperformed the conventional parameters. One weakness of MMCD is that its performance depends on range of candidate frames to compute the minimum cepstral distance, which requires the optimal selection of the range experimentally. In this paper, to alleviate the problem, we propose a multi-dimensional MMCD parameter which consists of multiple MMCDS with combination of different candidate frame ranges. Experimental results show that the multi-dimensional MMCD parameter yields an error rate reduction of 22.5% compared with the optimally chosen one-dimensional MMCD parameter.

• Journal of Multimedia Information System
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• 제5권4호
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• pp.273-276
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• 2018

In video compression standards, the entropy coding is essential to the high performance compression because redundancy of data symbols is removed. Binary arithmetic coding is one of high performance entropy coding methods. However, the dependency between consecutive binary symbols prevents improving the throughput. For the throughput enhancement, a new probability model is proposed for encoding multi-symbols at one time. In the proposed method, multi-symbol encoder is implemented with only adders and shifters, and the multiplication table for interval subdivision of binary arithmetic coding is removed. Compared to the compression ratio of CABAC of H.264/AVC, the performance degradation on average is only 1.4% which is negligible.

• 한국항행학회논문지
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• 제12권5호
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• pp.464-469
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• 2008

Serial 통신에는 RS-232C 통신과 같은 Un-balanced 방식과 RS-485/422통신과 같은 Balanced 통신 방식이 있다. 이 가운데 RS-485 통신의 경우는 통신의 거리가 길고 Balanced 방식에 의한 전송방식이기 때문에 RS-232에 비하여 데이터의 신뢰성이 매우 우수하므로 산업현장에 많이 사용되고 있다. 통상적으로는 하나의 통신선 위에서는 하나의 프로토콜을 이용하여 통신을 구현하는 것이 일반적인 방법이다. 본 연구에서는 RS-485 serial 전송의 Physical layer 위에 여러 가지 종류의 장비나 기기를 동시 연결하여 사용할 수 있도록, 다수의 통신 Protocol을 구현하는 방법을 실현하여 보고 성능을 검증하여 보고자 한다.