• Journal of Radiation Protection and Research
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• v.12 no.1
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• pp.34-39
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• 1987

Radiation shielding analysis for a 6MeV X-ray facility was carried out. The primary and leakage radiation for the facility can be evaluated based on the methodology in NCRP No. 49 and 51. The present study deals with radiation scattering analysis for the outside and inside door of the facility based on the albedo concept. The calculated dose rates were compared with the results of MORSE-CG code calculation and the measured data, resulting in a good agreement, even though there existed some deviation for the inside door. These results can be utilized to the radiation shielding design of the medical and industrial X and gamma ray facilities, and to the safety evaluation of these facilities.

• Journal of KIISE:Software and Applications
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• v.33 no.8
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• pp.692-702
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• 2006

In this study, a weighted fuzzy min-max (WFMM) neural network model for pattern classification is proposed. The model has a modified structure of FMM neural network in which the weight concept is added to represent the frequency factor of feature values in a learning data set. First we present in this paper a new activation function of the network which is defined as a hyperbox membership function. Then we introduce a new learning algorithm for the model that consists of three kinds of processes: hyperbox creation/expansion, hyperbox overlap test, and hyperbox contraction. A weight adaptation rule considering the frequency factors is defined for the learning process. Finally we describe a feature analysis technique using the proposed model. Four kinds of relevance factors among feature values, feature types, hyperboxes and patterns classes are proposed to analyze relative importance of each feature in a given problem. Two types of practical applications, Fisher's Iris data and Cleveland medical data, have been used for the experiments. Through the experimental results, the effectiveness of the proposed method is discussed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.1B
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• pp.94-104
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• 2003

This paper addresses the issue of applying the concept of IT everywhere IT inside to R&D planning system We investigate R&D planning system, mid term IT technology development plan, and the fact and outlook of wireless communications technology in Korea and also focus o deriving core wireless telecommunications technologies and priority setting under R&D planning system, using Analytic Hierarchical Process.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.40 no.7
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• pp.471-475
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• 2016

In the present study, temperature evaluations on long-term storage of radioactive waste produced in the process of isotope production were performed using two different methods. Three-dimensional analysis was carried out assuming a volumetric heat source, while two-dimensional studies were performed assuming a point source. The maximum temperature difference between the predictions of the volumetric and point source models was approximately $5^{\circ}C$. For the conceptual design level, a point source model may be suitable to obtain the overall temperature characteristics of different loading locations. For more detailed analysis, the model with the volumetric source may be applicable to optimize the loading pattern in order to obtain minimum temperatures.

• Information and Communications Magazine
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• v.29 no.11
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• pp.68-74
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• 2012

국내 차세대 이동통신 산업은 1994년 세계 최초 CDMA 상용화에 이은 CDMA2000 및 W-CDMA 구축, 세계 최초 최고의 무선 인터넷 기술인 WiBro기술의 개발 및 보급, 꿈의 통신으로 여겨지는 3.9세대 LTE시스템 구축과 보급으로 세계 최고의 뛰어나 기술력을 가진 산업으로 발전하였다. 이러한 우수한 국내 이동 통신 인프라는 기존의 조선 및 선박과 같은 전통산업과 바이오 및 의료기기와 같은 신산업과의 융합을 통하여 국가 경쟁력 한층 더 향상 시키는데 기여하였다. 또한 휴대폰분야에서도 국내 기업이 세계 최고의 경쟁력을 가진 기업으로 성장하는 등, 차세대이동통신 산업은 타 산업과 달리 기술의 빠른 추종자 (Fast Follower)에서 기술 선도자 (First Mover)로서의 지위를 가지게 되었다. 그러나, 이동통신 시스템 분야에서는 이미 중국 업체가 세계적으로 약진하고 있으며, 휴대폰 분야에서는 선도 기업과의 경쟁 및 견제, 후발 주자인 중국 및 대만 기업의 추격에 직면하고 있다. 한편 국내 휴대폰관련 중소 중견기업은 급격한 단말 환경변화에 따라 많은 어려움에 처해 있다. 따라서 본 논문에서는 차세대 이동통신 기술 선도자로서 지속적인 경쟁력 확보 및 대-중소기업 동반성장 생태계 조성을 통한 모바일 최강국 달성을 위한 이동통신 분야 국가 연구 개발 전략을 제시하고자 한다. 먼저 제I장에서는 차세대이동통신의 개념 및 분류 기준에 대하여 알아보고, 제II장에서는 차세대이동통신에 대한 국내외 현황과 국내 기술 수준 및 기술 경쟁력을 고찰한다. 제III장에서는 기술 선도자로서의 차세대이동통신 분야의 비젼을 제시하고, 이러한 비젼을 실현시키기 위한 국가연구개발 추진 전략을 제시한다. 마지막으로 제IV장에서는 우리나라 이동통신 미래상과 함께 국가연구개발 전략에 대한 결론을 맺는다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.8
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• pp.1961-1972
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• 2014

Recently, with the increasing of the interest in the integration of medical technology and information communication technology, researches on WBAN (Wireless Body Area Networks) that try to apply sensor network to the human body have been processed actively. The existing sensor network technology has the potential to be used in WBAN, but it has some limitations also. In particular, because the sensors are likely to communicate through each part of the body, it has a very different network environment from the sensor network that uses a free space. Therefore, researches on WBAN have a variety area of study that slightly different from the conventional sensor networks and take into account the characteristics of the body. In this study, we investigate the environmental characteristics of WBAN that are separated from the conventional sensor network, and the research trends of WBAN systematically by using the technique of SLR (Systematic Literature Review) from 2001 around when the concept of WBAN has been introduced. The investigation includes the classification of research and the researcher's features. And the survey results and the outlook for further study are summarized.

• Land and Housing Review
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• v.3 no.2
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• pp.147-157
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• 2012

The Korean government required the mandatory ratio of public housing including the housing unit for elderly in February 2012 and the number of them is expected to increase accordingly. To prepare for an aged society, these enabling ubiquitous technology will be able to support efficient health care services, which was mentioned in various studies. Therefore, the aim of this study is to draw the design elements for an apartment for providing health care services according to the degree of independence of elderly people and to grasp the current situation and work out tactics by the evaluation of four actual cases. In housing unit in the elderly housing project, design elements supporting amenity improvement was rated to the highest importance, however, in reality, was reflected at lower rate while the risk management plan for public space was applied at the highest rate. Design elements required by new technology such as health monitoring and community management with outside world are still not reflected, however, in order to realize the concept of 'aging in place', health care services in various aspects should be considered in housing planning.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.35 no.2
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• pp.135-141
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• 2011

A smart home provides services that its inhabitant needs or wants, by integrating and simultaneously controlling various devices and sensors. In this study, we focused on a smart-home system for people with disabilities and for elderly people. We introduced a new type of system for real-time analysis of body posture of the inhabitants of a smart home. The system includes the concept that offers remote healthcare or medical services by using a 3D tilt sensor for recognizing the static and dynamic postures of inhabitants in real time. It consists of a smart-home server and a 3D tilt sensor, and it uses wireless technology to communicate with the inhabitants and thus enhance their mobility. The smart-home server includes the inference engine that differentiates the dynamic postures from the static ones. Finally, we also demonstrate the usefulness of the proposed system by applying it to a real environment.

• The Journal of the Korea Contents Association
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• v.19 no.7
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• pp.166-175
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• 2019

The constitution of traditional medicine is distinguished from modern medicine. Sasang medicine describe the constitution which is classified as functional intensity of the lung, spleen, liver and kidney. The functional strength of each part of the human body is not the same in each constitution, and this imbalance is considered as a major factor of the disease. Ayurveda is identified the balance of the three dosha in our body is the basis of health maintenance. The reason for the illness is due to the imbalance among vata which express energy metabolism, pitta which plays a role in metabolism and digestion, and kapha which controls body temperature. The two theories which include knowing the characteristics and trends of diseases according to their constitution, the approach of treatment and the health care of daily life. They are also considered as convergent area about treatment methods in the modern society where individual characteristics and lifestyle are emphasized. The purpose of this study is to understand the concept of constitutional basis for increasing patient satisfaction and to help diversity of treatment in preventive medical area by comparing and analyzing the theory of Sasang and Ayurveda.

• Journal of the Microelectronics and Packaging Society
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• v.28 no.2
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• pp.13-28
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• 2021

Since transient electronic devices can operate under harsh conditions such as electrolytic solutions or inside the body, and be removed by hydrolysis after operation, they can replace conventional electronic devices in various research areas like biomedical implantable devices. Moreover, transient electronic devices that can dissolve in water and enzymes are the focus of the new concept of green technology, which can solve electrical waste issues. However, the surroundings of transient electronic devices can deteriorate internal device components. Thus, an encapsulation strategy is introduced for stable operation in solution by shielding the outside of a device with a passive barrier. This article summarizes recent research trends in transient electronic devices, including their background, dissolution behavior, and encapsulation strategies to enhance reliability by blocking water permeation.