• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.8
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• pp.878-887
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• 2012

Aeronautical frequency band is to be internationally protected for aviation safety. Recently, with a rapid growth of an international air traffic, aeronautical frequency band is getting saturated, and thus may causes the interference in the congested frequency band. In this paper, an efficient aeronautical frequency allotment and management policies are proposed for resolving the existing problems in the aeronautical frequency band. The key activities include the review of the aeronautical frequency management and interference mitigation policies in a few important foreign countries such as United States and Japan. This policy study will be contributed for the future air safety in the aeronautical frequency management point of view.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.313-314
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• 2014

인구의 고령화로 만성질환자가 증가함에 따라 개인건강관리를 위한 U 헬스 서비스에 관심이 증대되고 있다. U 헬스 서비스를 활용하기 위해서는 다양한 생체정보를 간편하게 측정하는 개인건강기기(PHD, Personal Health Device)가 필요하다. 하지만 혈압, 심전도, 혈당, 산소포화도 등을 측정하는 개인건강기기는 제작 회사마다 서로 다른 프로토콜과 포맷으로 개발되어 기기간의 상호 운용성(Interoperability)이 보장되지 않는다. 또한 각기 다른 포맷으로 측정된 데이터를 병원정보시스템(HIS, Hospital Information System)간 공유하고 관리하는데 어려움이 존재한다. 이에 따라, 본 논문에서는 개인건강기기 국제 표준인 IEEE 11073 PHD 를 기반으로 다양한 개인건강기기와 실시간으로 통신하며, 측정된 생체정보를 관리하고 전송하는 모바일 헬스케어 매니저 설계를 제시한다. 제시한 매니저는 다양한 모바일 기기 중 스마트폰 기반으로 설계하였고, 각기 다른 포맷으로 측정된 데이터를 국제표준 메시지 교환방식인 HL7 (Health Level Seven)메시지로 변환하여 전달하는 게이트웨이 역할을 담당한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.360-360
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• 2020

조립식 빗물침투형 저류블록은 우수유출 저감시설로, 황토 및 친환경 무기질 결합재를 이용하여 제작한 고강도 투수성 블록의 적층 및 요철에 의한 끼움식 조립에 의해 형성된 공간에 빗물을 저류하고, 저장된 빗물은 시간이 지남에 따라 지반으로 침투시키는 우수유출 저감용 빗물관리시설로, 집중강우 시 유출수가 발생하는 해당지역에 분산식으로 설치하여 국지적 호우 발생에 대처할 수 있으며, 지속적인 침투를 통한 지하수위 확보 및 가뭄현상의 저감은 물론, 미기후 조성과 건전한 물순환 구조 형성에 이바지하는 빗물관리기술이다. 본 기술은 집중형 대규모 빗물저류조의 적용상의 문제점과 단순저류의 한계성을 극복하고, 기존 침투시설의 낮은 침투능을 증대시키고자 저류기능과 침투기능을 동시에 확보하여 집중호우시 빠른 침투저류능을 향상시킨 조립식 빗물침투형 저류시설이다. 보다 구체적으로는 집중강우에 대한 방재적 측면과 함께 가뭄으로 발생하는 지하수위 저하 등에 친환경적으로 대응하기 위한 복합적인 빗물관리 기술로서, 빗물 유출저감과 함께 물순환 회복 및 저영향개발을 위한 각 지자체의 지침과도 부합될 수 있다. 또한, 콘크리트 제품의 환경적 문제점과 플라스틱 제품의 낮은 물성을 극복하였고, 시공 시에는 보다 현장상황에 맞게 가변적 형태로 적용이 가능한 단순조립 적층공법으로 공기단축에 탁월한 장점이 있으며, 유지관리 시에는 별도의 동력이 요구되지 않는 형태로 개발하였다. 조립식 빗물침투저류블록의 구조체를 이루는 단위 블록유닛은 투수성 소재로 제작되며, 상하부가 개방되어 있고 사각형의 내부에 힘을 받는 격벽과 전후벽이 상호 대응되는 요철로 형성되어 있으며, 단위블록 유닛 다수개가 수직수평으로 연속적으로 조립되어 규모의 제한, 형태의 제한이 없는 구조물 형성이 가능하다. 본 구조체의 저류공극율은 80%이상 확보 가능하며, 또한 블록자체의 투수율이 0.83mm/sec로서 순모래나 순자갈의 포화투수계수보다 투수율이 높아 침투저류 효율성이 높으며 시공 후 상부 토지는 자유롭게 활용 가능하다. 본 조립식 빗물 침투형 저류블록을 이용하여 저영향개발 계획, 우수유출 저감대책 수립, 빗물관리시설 계획시 기존의 시설들에 비하여 경제적, 효율적인 설계가 가능하다.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.1
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• pp.233-240
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• 2014

According to the recent increasing trend of the ages, numbers of patients with chronic diseases are increasing and issues for health care are importantly emerged. In this thesis the research implements U-health care system for health care of patients with chronic diseases. The suggested system for health care of patients with chronic diseases composes bio measurement system, mobile gateway and medical information management server, and bio-signals are composed with modules such as electrocardiogram, blood pressure, blood sugar, oxygen saturation if configured as client. Blood sugar check was considered and implemented to be chosen the ways to transmit through bio measurement system or through gateway. Suggested bio measurement system and mobile gateway are transmitted through Bluetooth. The transmitted biodata is searched by observing health check through mobile gateway, by transmitting through network server, and by using client. By implementing bio signal observation system of patients with chronic diseases, present health check is available by monitoring measured bio data, and various bio signals are transmitted in the mobile environment.

• Journal of Conservation Science
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• v.6 no.2 s.8
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• pp.119-125
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• 1997

The National Museum of Korea bears a responsibility of keeping and caring of unearthed cultural properties according to Cultural Properties Protection Law, No. 3644. As a result, the unearthed cultural properties are stored up in the museum. More than 10,000 units of cultural properties are unearthed each year, and the number is increasing as years go by. However, the keeping facilities of the museum are already over-saturated. Consequently, many unearthed cultural properties are entrusted to university museums that have poor facilities and a few experts. More pressing problem is that these cultural properties are not under the proper protection of scientific conservation. One reason is that there are not many conservation scientists in our country. Only five members are working as conservation experts at the National Museum of Korea and 20 or so nation-wide. We propose to establish a new system and organization which will take charge of the conservation and care of the cultural properties, and consist of scientific keeping facilities and expert personnel (conservation scientists) to solve these problems.

• Conservation Science in Museum
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• v.1
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• pp.9-14
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• 1999

The responsibility of keeping and caring of unearthed cultural properties belongs to the National Museum according to cultural properties protection law(law No.3644). So unearthed cultural properties are possessed by the museum after going through the regular course. Number of those cultural properties is increasing swiftly. Every year more than ten thousand units of cultural properties are unearthed. The number of unearthed cultural properties is expected to increase in the future. Howeve, the keeping facilities of the National Museum are already over-saturated. So many unearthed cultural properties are being entrusted to university museums that have bad facilities and few personnel. It makes many problems including inadequate caring. More pressing problem is that those cultural properties are not under the protection of scientific conservation processing and caring. The reason is that there are so few conservation scientists in Korea. There is no independent department of conservation science even in the National Museum, where only five members are working as conservation experts. To solve those problems, new system and organization which win take charge of conservation and care of cultural properties, that is, an organization which will consist of scientific keeping facilities and expert personnel (conservation scientists) is needed immediately.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.5D
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• pp.513-522
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• 2010

Underground construction for traffic networks, complexes, and storage facilities has risen as an effective land use plan for dealing with emerging problems such as overcrowded urban cities and traffic jams. This paper performed an economic feasibility analysis of the development of the integrated field management system which provides field workers and managers with 3D-based location tracking and clear communication during underground construction works. To conduct the analysis, processes and problems of field management for underground construction were analyzed and deduction in accidents and field management costs and productivity improvement were estimated as expected benefits. Based on computed benefits and costs, an economic analysis was conducted using Benefit/Cost ratio(B/C), Net Present Value(NPV), and Internal Rate of Return(IRR) and then sensitivity analysis was performed to cope with the uncertainty of assumed variables.

• KIPS Transactions on Computer and Communication Systems
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• v.12 no.5
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• pp.171-180
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• 2023

The three major sleep disorders in Korea are snoring, sleep apnea, and insomnia. Lack of sleep is the root of all diseases. Some of the most serious potential problems associated with sleep deprivation are cardiovascular problems, cognitive impairment, obesity, diabetes, colitis, prostate cancer, etc. To solve these problems, the Korean government provided low-cost national health insurance benefits for polysomnography tests in July 2018. However, insomnia patients still have problems getting treated in terms of time, space, and economic perspectives. Therefore, it would be better for insomnia patients to be allowed to test at home. The measuring device can measure six biosignals (eye movement, tossing and turning, body temperature, oxygen saturation, heart rate, and audio). A gyroscope sensor (MPU9250, InvenSense, USA) was used for eye movement, tossing, and turning. The input range of the sensor was in 258°/sec to 460°/sec, and the data range was in the input range. Body temperature, oxygen saturation range, and heart rate were measured by a sensor (MAX30102, Analog Devices, USA). The body temperature was measured in 30 ℃ to 45 ℃, and the oxygen saturation range was 0% for the unused state and 20 % to 90 % for the used state. The heart rate measurement range was in 40 bpm to 180 bpm. The measurement of audio signal was performed by an audio sensor (AMM2742-T-R, PUIaudio, USA). The was -42 dB ±1 dB frequency range was 20 Hz to 20 kHz. The measured data was successfully received in wireless network conditions. The system configuration was consisted of a PC and a mobile app for bio-signal measurement and data collection. The measured data was collected by mobile phones and desktops. The data collected can be used as preliminary data to determine the stage of sleep and perform the screening function for sleep induction and sleep disturbances. In the future, this convenient sleep measurement device could be beneficial for treating insomnia.

• Korean Journal of Medicinal Crop Science
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• v.9 no.3
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• pp.232-237
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• 2001

This study was carried out to know the effect of light intensity, temperature and $CO_2$ concentration on photosynthesis and transpiration in yacon(Polymnia sonchifolia Poepp.& Endl.). Light compensation point was ${58\;{\mu}mol\;m^{-2}\;s^{-1}}$and light saturation point was ${1708\;{\mu}mol\;m^{-2}\;s^{-1}}$. Transpiration rate was increased to about 4 mmol${m^{-2}\;s^{-1}}$ with increasing of light intensity to ${2193\;{\mu}mol\;m^{-2}\;s^{-1}}$. The optimum temperature for photosynthesis was ${24^{\circ}C}$ in air. Photosynthesis was gradually reduced as transpiration rate increased from 4 to 8 mmol ${m^{-2}\;s^{-1}}$ in different air temperature. $CO_2$ compensation point was 63 vpm and $CO_2$ saturation point was 1155 vpm and light saturation point was enhanced with increasing of $CO_2$ concentration from 350 vpm to 1300 vpm.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.3
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• pp.691-697
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• 2013

Recently, u-healthcare device is developed and commercialized for healthcare management and emergency medical. The kinds of the measurable biomedical signals on the device are electrocardiogram, skin temperature, pulse oxygen, heart rate, respiration, etc. Specially, the photoplethysmograph(PPG) signal of these signals is the important signal in measuring oxygen, heart rate and peripheral vascular compliance. The accuracy of PPG signal reduce from influence of the motion artifacts that generated from the movements of user or patient. Therefore, this study suggests a new method to remove the motion artifact that is using optical power modulation and ICA(Independent Component Analysis). For analyzing the proposed method, we used variety of noises made by artificially. In the results of experiments, the proposed method showed good performances than an adaptive filter.