• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.12
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• pp.2348-2354
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• 2016

In recent days, IoT (Internet of Things) technology has been widely used in the field of agriculture, which enables the collection of environmental data and biometric data into the database. The availability of big data on agriculture results in the increase of the machine learning based analysis. Through the analysis, it is possible to forecast agricultural production and the diseases of livestock, thus helping the efficient decision making in the management of smart farm. Herein, we use the environmental and biometric data of Smart Pig farm to derive the accurate relationship model between the environmental information and the daily weight increase of swine and verify the accuracy of the derived model. To this end, we applied the M5P tree algorithm of machine learning which reveals that the wind speed is the major factor which affects the daily weight increase of swine.

• Nuclear Engineering and Technology
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• v.4 no.4
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• pp.331-339
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• 1972

For the syntheses of tritium labelled polystyrene, the basic material for the preparation of tritium luminous compound, various methods of labelling such as Tesla discharge, Wilzbach exposure, gamma irradiation, and U V. irradiation were compared in view of getting high specific activity-product. The obtained polystyrene-T(G) by the method of Tesla discharge and by the method of U. V. irradiation had specific activity of 1～1.2 mCi/mg, and these two methods were the most encouraging. Mixing of 1 part of polystyrene-T(G) with 4 parts of ZnS:Cu phosphor, in weight, appeared to be the most suitable ratio in tile preparation of luminous compound in luminosity point of view. When 30 mg. of obtained luminescent mixture was applied on steel plate by using 1 ml. of the selected binder (i.e., 1g of commercial varnish in 100m1. of benzene) the luminosity maximum was ca. 20 micro Lambert. The prepared luminous compound was confirmed to be practically applicable for mine marker or dark-room light source.

• Proceedings of the Korea Contents Association Conference
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• 2003.11a
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• pp.308-312
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• 2003

In this paper, we propose the M-QDMR algorithm for improvement QoS in the wire/wireless integrated environment. Through simulations and comparing to another multicast algorithm, we reach a conclusion is that M-QDMR can simply and dynamically adjusts the construction of multicast tree with little delay and the most reducible bandwidth resources.

• Information and Communications Magazine
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• v.28 no.9
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• pp.3-9
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• 2011

본고에서는 급속히 성장하고 있는 M2M 서비스의 융합과 발전을 위해 어떤 걸림돌이 있으며, 무엇을 준비해야 하는지에 대해 알아보고자 한다. 지난 1T839 정책에서 3대 인프라의 하나로 정의된 USN이 본격 확산에 미흡했던 사항에는 어떤 것들이 있었으며 당시 기술적인 환경과 서비스 사례를 통해 2% 부족했던 것들은 되짚어 보고, USN이 현재 시점에 가지는 의미를 찾아보고자한다. USN 서비스가 활성화 되던 시점에 M2M의 기반기술이라고 할 수 있는 (W)CDMA 등 광역 무선망 기술과의 접목이 어려웠던 부분과 USN의 다양한 근거리 무선 네트워크 기술들이 USN 서비스를 완벽히 구현하고 확산까지 갈 수 없었던 미흡했던 이유를 알아보고자 한다. 또한 M2M의 시작배경에는 어떠한 의미가 있으며, 현재에서 바라본 M2M은 시작과 비교해서 달라진 점이 무엇이며 현재에 요구되는 M2M은 무엇인지에 대해 논의해보고자 한다. 이와 함께 M2M의 다양한 정의와 현재의 M2M을 비교해보고 M2M이 급속히 증가하고 있는 이유들을 찾아본다. M2M 서비스를 크게 나누면 텔레매틱스와 텔레매트리로 나눌 수 있으며 최근에는 차량 관련된 분야에 M2M 서비스가 급속히 증가되고 있는데 해외의 eCall 서비스와 국내의 DTG 연계 M2M 서비스, 국가위험물관리 등 국내외 차량관련 M2M 서비스 사례를 분석해 보고, RFID/USN+LBS+M2M의 융복합 서비스 진화에 대해 알아보고자 한다. 끝으로 M2M 시대의 시대적 요구사항을 반영하여 M2M의 활성화를 위해서 필요한 공공과 민간의 역할을 짚어보고, 우리가 준비해야할 것에 대해 제언하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.5
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• pp.93-98
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• 2017

The fixing behaviors of raw silk yarns treated with melamine and formaldehyde at a molar ratio of 1:3 for trimethylolmelamine were investigated. Sericin was fixed during the fixing process, but a part of sericin I was removed simultaneously by hot water. The weight losses by fixing and the degumming losses by degumming greatly decreased with increasing concentrations of melamine and formaldehyde. The silk yarns fixed with 0.011 M melamine and 0.033M formaldehyde were significantly degummed due to the insufficient fixation of sericin and the alkaline hydrolysis of sericin by sodium carbonate during the degumming process. On the other hand, the silk yarns fixed with 0.055M melamine and 0.165M formaldehyde were degummed slightly (the degumming losses of 3-8%) due to the strong fixation of sericin, which might result from the many cross-linkages between the sericin I molecules, which were formed by trimethylolmelamine. Those fixed with the fixing solution containing 15% owf softener showed the lowest weight and degumming losses because under the condition of 15% owf softener, the cation of the softener can effectively form ionic bonds with the negatively charged side chain of aspartic acid in sericin. In addition, van der Waals' forces may be also formed between the hydrophobic tail of the softener and the hydrophobic region of sericin, which may help inhibit the removal of sericin I.

• Journal of The Korean Association of Information Education
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• v.24 no.5
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• pp.483-494
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• 2020

With the advent of the 4th Industrial Revolution, interest in AI education is increasing. In order to cultivate talented people with AI competencies who will lead the future, AI education must be conducted in a sound manner at the school site. Although AI education is being conducted at home and abroad, it was determined that the role of the AI education platform is important to implement better AI education, so this study investigated the perception of experts on the AI education platform. A perception survey was conducted based on five criteria: teaching and learning management, educational contents, accessibility, performance of AI education platform, and level suitability of elementary school students. As a results, the number of 103 educational experts selected 'Entry' as the most proper platform among the eight platforms - 'Machine learning for Kids', 'Teachable Machine', 'AI Oceans(code.org)', 'Entry', 'Genie Block', 'Elice', 'mBlock' and etc. Analysis shows that this is because 'Entry' provides quality educational content, has convenient accessibility, is easy to manage teaching and learning, as well as an AI education platform suitable for the level of elementary school. In order to apply various AI education platforms to the school field, it is necessary to train teachers in AI-related training to train them as AI education experts, and to continuously provide opportunities to experience AI education platforms. In this study, there are limitations to what is called 'a population perception survey'. because only 103 people were surveyed, and most of the experts are working in a specific area(Gyeonggi-do). In the future, it is judged that research targeting experts at the national level should be conducted to supplement these limitations.

• 한국체육학회지인문사회과학편
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• v.55 no.6
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• pp.749-757
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• 2016

The purpose of this study was to investigate the effect of stability on one leg standing posture in yoga practice. Thirteen women college student who have never done yoga participated in this study. In order to collect data before and after yoga practicing for two years, we were used 3D motion capture system and electromyography. The results were as follows. First, ranges of motions for Y axis of left knee joint and X axis of right ankle joint were significantly different in dancer posture(p<.05), and then X axis of right ankle and Y axis of left ankle joint were significantly different in tree posture of pre and post training. Second, the planar alignment angle of trunk-pelvis was not significant difference in dancer and tree posture. Third, CoM-distances of Y, Z directions were significant difference in the tree posture(p<.05). Fourth, Muscle activities of both rectus abdominis, erector spinae and left quadriceps were significant difference in tree posture(p<.05). These findings suggested that yoga training played important roles in stable postures as results of decreasing rotation ankle joint and movement of CoM and enforcing core muscles. This study provides evidence for effectiveness of the stability on standing posture and can get a great effect on posture correction by means of yoga training. Hereafter, study on alignment angle, which is a measurement of postural stabilization will be needed by future yoga training.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06b
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• pp.411-415
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• 2008

최근 멀티미디어 응용에서 XML은 메타데이터를 표현하기 위하여 그 사용량이 증가하고 있는 추세이며, 그 예로는 MPEG-7 MDS, MPEG-21등이 있다. 이러한 XML형식의 메타데이터의 크기를 줄이기 위하여 MPEG-7에서 정의한 포맷이 Binary Format for Metadata(BiM)이다. BiM은 스트리밍을 고려하여 단편화를 통한 점진적인 전송이 가능하며, 압축률이 높고 복호화에 따르는 오버헤드가 작다는 장점을 제공한다. 본 논문에서는 BiM에 대한 간단한 소개와 모바일 환경에 적합하도록 구현한 BiM 복호기의 설계 및 구현에 대하여 소개한다.구현한 복호기는 모바일 환경의 다양한 플랫폼에서의XML 파싱 모듈과 DOM 트리모듈에 대한 종속성을 제거하기 위하여, 스키마 파일의 파싱을 데스크탑에서 수행하고 이에 대한 파싱 결과를 자체 정의한 Syntax File 형식으로 복호기에 전송할 수 있도록 하였다. 또, BiM형태로 전송되는 ESG 메타데이터와 MPEG-4 LASeR 스트림에 대하여 Windows, Windows CE, embeded Linux 환경에서 정상적으로 복호화 하는 것을 확인하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06d
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• pp.95-99
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• 2007

오버레이 멀티캐스트는 응용 계층을 기반으로 멀티캐스트 트리를 구성함으로써 서비스 보급을 위한 비용 소모를 최소화하고 확장성 있는 일대다 통신 구조를 지원한다. 그러나 이를 이동망에 적용하기 위해서는 이동성 지원 메커니즘과 패킷 손실 및 패킷 중복 수신 방지 기능을 함께 지원하는 오버레이 멀티캐스트 기법이 요구된다. 본 논문에서는 이를 해결하기 위하여 오버레이 멀티캐스트 기법인 mRMCP를 제안한다. 이 기법은 응용 계층 기반의 Advertisement 기능을 이용하여 하위계층의 지원 없이 단말의 이동성을 지원한다. 또한 중계기와 단말 간 데이터 전송 시 독립적인 멀티캐스트 채널을 활용함으로써 패킷 중복 수신을 최소화한다. 이와 같은 기능을 통해 mRMCP는 이동 환경에서 확장성 있는 멀티캐스트 서비스를 제공한다.

• Journal of the Korean Chemical Society
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• v.15 no.6
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• pp.352-358
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• 1971

The interaction between dimethylsulfoxide molecules and some organic molecules, i.e.nitrobenzene, m-dinitrobenzene, o-dinitrobenzene, 1,3,5-trinitrobenzene, m-xylene, mesitylene, bibenzyl, biphenyl, o-phenanthrene, naphthalene, has been studied. The organic molecules exhibit negative deviation from Raoult's law due to the formation of the charge transfer complexes with dimethylsulfoxide. The stability constants of the complexes were determined spectrophotometrically, and also some thermodynamic functions were calculated. The binding energies of the complexes appear in the range of -1 ∼ -4 kcal/mole. The stability depends on the polarity and basicity of the solvent used.