• Journal of Biosystems Engineering
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• 제36권6호
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• pp.467-475
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• 2011

Aerial spraying technology using a small unmanned helicopter is an efficient and practical tool to achieve stable agricultural production to improve the working condition. An attitude controller for the agricultural helicopter would be helpful to aerial application operator. In order to construct the flight controller, a state space model of the helicopter should be identified using a dynamic analysis program, such as CIFER$^{(R)}$. To obtain the state space a model of the helicopter, frequency-sweep flight tests were performed and time history data were acquired using a custom-built stick position transmitter. Four elements of stick commands were accessed for the collective pitch (heave), aileron (roll), elevator (pitch), rudder (yaw) maneuvers. The test results showed that rudder stick position signal was highly linear with rudder input channel signal of the receiver; however, collective pitch stick position signal was exponentially manipulated for the convenience of control stick handling. The acquired stick position and flight dynamic data during sweep tests would be analyzed in the followed study.

• 한국콘텐츠학회논문지
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• 제12권2호
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• pp.453-460
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• 2012

최근 해외여행에서도 음식 체험이 주가 되는 관광인 '푸드 투어리즘'이 크게 각광받고 있다. 한편 스마트폰 가입자가 기하급수적으로 늘어나면서 푸드 투어리즘을 즐기려는 해외여행자들에게 여행지의 음식문화에 대한 신뢰성 있는 정보를 제공해줄 수 있는 스마트폰 애플리케이션의 필요성도 대두되었다. 본 연구는 해외의 음식문화에 대한 정보를 제공하는 스마트폰 애플리케이션의 제작 과정을 통하여 요리와 음식문화가 어떻게 상업성이 있는 콘텐츠로 가공, 개발될 수 있는지 모델을 제시하고자 하였다. 특히 본 연구에서 구축한 콘텐츠는 해외 10개국에 현재 거주하거나 장기 거주한 경험이 있는 다수의 음식 전문가들이 언어, 문화, 식품과 음식에 대한 지식을 공유하는 집단지성 체계를 통해 다양한 지역, 풍성한 아이템, 정보의 깊이와 정확성이라는 양적, 질적 수준을 모두 충족시키는 정보로 유저들의 호응을 끌어냈다는 점에서 앞으로 개발될 애플리케이션용 문화 콘텐츠의 제작 모델 역할을 할 것으로 기대된다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.223-224
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• 2021

Recently, the demand for high fluidity concrete has been increased due to skyscrapers. However, it has its own limits. First of all, high fluidity concrete has large variation and through trial & error it costs lots of money and time. Neural network model has repetitive learning process which can solve the problem while training the data. Therefore, the purpose of this study is to predict optimum mix design of 40MPa, 60MPa high fluidity concrete by using neural network model and verifying compressive strength by applying real data. As a result, comparing collective data and predicted compressive strength data using MATLAB, 40MPa mix design error rate was 1.2%~1.6% and 60MPa mix design error rate was 2%~3%. Overall 40MPa mix design error rate was less than 60MPa mix design error rate.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권2호
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• pp.583-600
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• 2014

Social media is considered a valuable platform for gathering and analyzing the collective and subconscious opinions of people in Internet and mobile environments, where they express, explicitly and implicitly, their daily preferences for brands and products. Extracting and tracking the various attitudes and concerns that people express through social media could enable us to categorize brands and decipher individuals' cognitive decision-making structure in their choice of brands. We investigate the cognitive network structure of consumers by building an inter-category map through the mining of big data. In so doing, we create an improved online recommendation model. Building on economic sociology theory, we suggest a framework for revealing collective preference by analyzing the patterns of brand names that users frequently mention in the online public sphere. We expect that our study will be useful for those conducting theoretical research on digital marketing strategies and doing practical work on branding strategies.

• 농촌지도와개발
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• 제9권1호
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• pp.43-60
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• 2002

Recently the North Korea has been suffered from the grain shortage, and the fundamental reason was in the socialistic land regulations and collective production which restrain farmers' labor desire. So one of the key in solve the problem may be in the reformation of the socialistic land regulations and collective production, however, the capitalistic land regulations may not work as the reformational alternative in the North Korea. The third alternative for land should consider efficiency and equality of reformation itself as well as environmental problems. The purpose of the study was to discuss the possible application of the Public Land Lease from Henry $George(1839{\sim}1897)'s$ theory. The basic idea of the Public Land Lease was that the government has the right of sentence and the right of profit for the land, and the individual has the right of use for the land. Under the Public Land Lease, the individual must pay the land rent for the period of the use for land, and must return the land when the contract is over. If the North Korea's rural land regulations reformed into the Public Land Lease, it would be the first reformational model beyond china.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권7호
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• pp.2488-2511
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• 2015

Data redundancy has high impact on Wireless Sensor Network's (WSN) performance and reliability. Spatial and temporal similarity is an inherent property of sensory data. By reducing this spatio-temporal data redundancy, substantial amount of nodal energy and bandwidth can be conserved. Most of the data gathering approaches use either temporal correlation or spatial correlation to minimize data redundancy. In Collective Prediction exploiting Spatio Temporal correlation (CoPeST), we exploit both the spatial and temporal correlation between sensory data. In the proposed work, the spatial redundancy of sensor data is reduced by similarity based sub clustering, where closely correlated sensor nodes are represented by a single representative node. The temporal redundancy is reduced by model based prediction approach, where only a subset of sensor data is transmitted and the rest is predicted. The proposed work reduces substantial amount of energy expensive communication, while maintaining the data within user define error threshold. Being a distributed approach, the proposed work is highly scalable. The work achieves up to 65% data reduction in a periodical data gathering system with an error tolerance of 0.6℃ on collected data.

• 한국농촌건축학회논문집
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• 제14권3호
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• pp.17-24
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• 2012

This study is to propose the dwelling planning of collective housing for the senior citizen who lives alone in rural and fishing villages. and this paper analyzed a change element regarding the field of care service for the elderly. The results of research are as follows: First, the range a village unit of "Home for the Elderly" was investigated most primarily. Second, on the lifestyle of a bedroom, proper using person per a room was investigated to two people to use with one room and life style of using bed preferred more in life style of sitting on the floor(ondol). Third, most necessary facilities were examined into bathroom and steam-room, and the separation of man and woman space, toilet was investigated to 1 ranking. Fourth, to be most difficult care service was investigated by long-distance circulation. This is the item which can be reduced naturally in case of service activity caring for a visit in a collective housing.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2008년도 학술대회 2부
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• pp.340-345
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• 2008

Web2.0 이라는 인터넷 환경의 변화 속에서 사용자들의 자발적인 참여를 통해 생산된 컨텐츠(UCC)가 화두가 되고 있다. 다수의 사용자 참여는 집단지성을 발휘하고 이렇게 생성된 UCC 는 새로운 가치를 창출한다는 믿음이 확산된 가운데, 사용자는 더 이상 정보수용자의 입장이 아닌 정보제공자의 입장에서 컨텐츠 생성에 대한 범위와 역할이 크게 향상되고 있다. 그렇다면 과연 무엇이 이러한 사용자 생성 컨텐츠의 창의성에 가장 큰 원동력이 될까 또한 무엇이 집단지성, 집단의 창의성을 창출하는데 가장 큰 영향을 미칠까? 본 연구는 이러한 의문에서 출발하였다. 이와 같은 연구 문제를 해결하기 위하여 피드백과 동기 그리고 창의성에 기반한 인지 평가 이론과 창의성에 관한 사회적 특성이론에 근거, 상호작용 즉 컨텐츠에 대한 피드백을 기반으로 연구모형을 세우게 되었다. 이러한 연구 모형을 설문을 통해 검증해 본 결과, 피드백이 사용자의 동기에 긍정적인 영향을 미치고, 결국 그러한 동기가 개인의 창의성 및 집단 창의성에 긍정적인 영향을 미친다는 결론을 얻을 수 있었다. 이러한 연구 결과는 이론적으로는 인지 평가 이론의 확장 적용 및 CSCW 환경에서 암묵적으로 인식된 피드백과 같은 상호작용의 중요성을 공고히 하는데 기여할 수 있으며, 실제로는 이러한 피드백 요소를 시각적으로 적절히 배치 및 노출하여 사용자의 내적 용기와 창의성을 촉진하여야 함을 밝힌다는데 의의를 가질 수 있겠다.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2008년 추계학술발표대회 논문집
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• pp.108-111
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• 2008

South Korea, which has seen economic growth at a rapid pace and the number of the old people on the rise, is facing challenges, including social problems resulting from the aged society, lack of work force supporting the elderly and needs of renewing residential environment for them. The old people in the process of senility are forced to experience a wide range of physical, mental and social difficulties and problems when they are living in existing houses. This study was conduced with a sample group consisting of the elderly who were living in detached places of multiplex houses and a plane which was developed as a tool for a workshop, the one that is a collective residence model, also known as one of an alternative housing for the old in the future. This study finds that in order to get rid of negative images of the collective residence for the old, residence surroundings for the aged should be created not as uniform space formation but as aging-in-place, and specifically, considering that the quality of life for the aged remains to continue is needed. Findings can be a reference to create ideas of developing residential environment for the aged.

• International Journal of Contents
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• 제8권4호
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• pp.12-20
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• 2012

For a library to be able provide information services and fulfill its function as a knowledge convergence center capable of responding to various information demands, the development of next-generation information systems based on the latest information and communication technology is needed. The development of mobile information services using portable devices such smart phones and tablet PCs and information systems which incorporate the concepts of cloud computing, SaaS (Software as a Service), annotation and Library2.0 is also required. This paper describes a library information system that utilizes collective intelligence and cloud computing. The information system developed for this study adopts the SaaS-based cloud computing service concept to cope with the shift in the mobile service paradigm in libraries and the explosion of electronic data. The strengths of such a conceptual model include the sharing of resources, support of multi-tenants, and the configuration and support of metadata. The user services are provided in the form of software on-demand. To test the performance of the developed system, the efficiency analysis and TTA certification test were conducted. The results of performance tests, It is encouraging that, at least up to 100MB, the job time is approximately linear and with only a moderate overhead of less than one second. The system also passed the level-3 or higher criteria in the certification test, which includes the SaaS maturity, performance and application program functions.