• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.4C
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• pp.307-312
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• 2012

In this paper, we perform a complexity analysis for implementation of the ISO/IEEE 11073 Personal Health Device (PHD) standards in order to check the required system resources when ISO/IEEE 11073 PHD standards are implemented on the embedded system. Base on the implemented programs complying the PHD standards for a weighing scale, a blood pressure monitor, and a glucose meter among the various personal health devices, we make a pseudo-code. And then from the two different points of view such as program memory space and data memory space, we make a complexity analysis model. Because system resources or capability are strongly restricted in the personal health devices, our research work is very useful to estimate the required system resources.

• Journal of Astronomy and Space Sciences
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• v.30 no.2
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• pp.107-112
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• 2013

Tissue equivalent proportional counter (TEPC) can measure the Linear Energy Transfer (LET) spectrum and calculate the equivalent dose for the complicated radiation field in space. In this paper, we developed and characterized a TEPC for radiation monitoring in International Space Station (ISS). The prototype TEPC which can simulate a 2 ${\mu}m$ of the site diameter for micro-dosimetry has been tested with a standard alpha source ($^{241}Am$, 5.5 MeV). Also, the calibration of the TEPC was performed by the $^{252}Cf$ neutron standard source in Korea Research Institute of Standards and Science (KRISS). The determined calibration factor was $k_f=3.59{\times}10^{-7}$ mSv/R.

• Progress in Superconductivity
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• v.5 no.2
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• pp.98-104
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• 2004

We analyzed a noise-sensitivity profile of a specific SQUID sensor system for the localization of brain activity. The location of a neuromagnetic current source is estimated from the recording of spatially distributed SQUID sensors. According to the specific arrangement of the sensors, each site in the source space has different sensitivity, that is, the difference in the lead field vectors. Conversely, channel noises on each sensor will give a different amount of the estimation error to each of the source sites. e.g., a distant source site from the sensor system has a small lead-field vector in magnitude and low sensitivity. However, when we solve the inverse problem from the recorded sensor data, we use the inverse of the lead-field vector that is rather large, which results in an overestimated noise power on the site. Especially, the spatial sensitivity profile of a gradiometer system measuring tangential fields is much more complex than a radial magnetometer system. This is one of the causes to make the solutions of inverse problems unstable on intervening of the sensor noise. In this study, in order to improve the localization accuracy, we calculated the noise-sensitivity profile of our 40-channel planar SQUID gradiometer system, and applied it as a normalization weight factor to the source localization using synthetic aperture magnetometry.

• The Journal of Sustainable Design and Educational Environment Research
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• v.15 no.1
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• pp.19-29
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• 2016

This study aims to find a direction for desirable space organization in future Korean kindergartens by analyzing the current status of space organization in Japanese kindergartens. This study includes comparisons and analyses of Korean and Japanese curricula, facility standards on the national level and standards of national subsidy, current numbers of kindergarteners and preschoolers, and changes in kindergarten facilities over the last 5 years. Six kindergartens each in Korea and Japan, which were constructed after 2011 or are recommended as being good in space organization and kindergarten planning, are selected. The contents of space organization analysis are 'entry and placement, outdoor space', 'space program,' and 'plan design and organization of unit space'. In conclusion, in terms of space organization, Korean and Japanese kindergartens are very similar to each other. However, Japanese kindergartens have more outdoor space about $9.75m^2$ and lot area about $11.89m^2$ than Korean kindergartens. The extra space was used to educate students in various contents regarding social network and physical activity. Furthermore, in Japan, special spaces such as "atelier classes" and "PTA" were used for various types of education. Based on the results of the study will be developed, such as specific models and guidelines for the improvement of facilities Korea kindergarten.

• Bulletin of the Korean Space Science Society
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• 2008.10a
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• pp.34.4-35
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• 2008

The significant I&T process gain represented by reduction in overall budget expenditure can be obtained from the use of efficient alignment technique for large space optical systems. Such process gain tends to increase rapidly with an increase in aperture and/or in number of optical elements within the system. However, in practice, the alignment of multiple optical components tends to be rather difficult task because of the multiple coupling effects among the elements within the target system. In order to understand and hence identify the complex interplay of the wavefront coupling effects from the alignment process, the original differential wavefront sampling(DWS) method was presented elsewhere in recent years. DWS uses partial differential of the wavefront of optical component and perturbation value of the optical component against a particular alignment factor. The straightforward application of DWS for an off-axis optical system revealed that it tends to give incorrect estimation of the given misalignment state. In this study, we added off-axis correction terms to the original DWS algorithm and investigated its alignment performance. The performance simulation result for a Korsch type space optical system shows that the modified DWS is capable of bringing the misaligned system into the target alignment tolerance only after 3 iterations. It also shows that this new improved algorithm can be used to estimate the source misalignment as well. We are planning to apply this method for the alignment of a 800mm Korsch type telescope in the near future. We discuss the computational technique, simulation results and implications in details.

• Journal of the Korean Society of Propulsion Engineers
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• v.26 no.3
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• pp.10-21
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• 2022

The propellant tank, which is a space launch vehicle structure, must have structural integrity as various static and dynamic loads are applied during ground transportation, launch standby, take-off and flight processes. Because of these characteristics, the propellant tank cylinder, the structural object of this study, has a thin thickness, so buckling due to compressive load is considered important in the cylinder design. However, the existing buckling design standards such as NASA and Europe are fairly conservative and do not reflect the latest design and manufacturing technologies. In this study, nonlinear buckling analysis is performed using various analysis models that reflect initial defects, and a method for establishing new buckling design standards for cylinder structures is presented. In conclusion, it was confirmed that an effective lightweight design of the cylinder structure for common bulkhead propulsion tank could be realized.

• Journal of the Korean Home Economics Association
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• v.44 no.9
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• pp.103-117
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• 2006

There is no compulsory administration on the facility status for silver medical welfare facilities under the current legal regulations based on the welfare law of the aged nor is there standardized space allotment conditions that considered the physical psychological and pathological characteristics of the aged. Hence, welfare facilities are presently being constructed under general architectural laws. (Ed- paragraphs combined here) Therefore, standardized space allotment conditions should be planned soon for the aged in welfare facilities. (Ed- paragraphs combined here) In this study we examined the situation of space allotment through both blueprint analysis and interview with building supervisors. However, in future studies, we will focus on space insufficiency situations and the needs of the aged residents in welfare facilities.

• Journal of the Korean Institute of Rural Architecture
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• v.10 no.3
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• pp.19-26
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• 2008

The purpose of this study is to clarify the actual condition of external space general high schools newly established or planned in Gyeongnam from 2001 starting the 7th curriculum to 2006. The results of analysis about site plan type, composition state of external space and area ratio of its composition of each high school facilities are as follows: 1) In facilities arrangement of high schools, it shows diverse forms of arrangement from existing uniform straight type, however, most of schools do not being against the simple in their external space. 2) Comparing to traditional high school facilities, it occurs various types of plane and the area is somewhat expanded in the school with same class size, however, it needs to improve facility standards in its reality to deal with the change of future educational environment actively.

• Journal of The Korea Institute of Healthcare Architecture
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• v.12 no.1
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• pp.7-15
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• 2006

The recent change of the medical treatment market is reforming the hospital space. The death-rate caused by cancer diseases is increasing in the domestic and outside of the country. The specialized hospital for cancer patients must be required. This study analyzed the space structures of the main section in cancer hospitals with the comparison analysis method. Space structures of domestic cancer hospitals are not specialized comparing to other nations' cancer hospitals. The conclusion of this research is that we need the architectural planning standards of the specialized cancer hospital through the space structure mainly concerning patients.

• The Bulletin of The Korean Astronomical Society
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• v.46 no.1
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• pp.58.3-58.3
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• 2021

극한환경에서 작동 가능한 고분해능, 고정밀 대형 광학계 관측 플랫폼 시제품 (Super Eye Bridge) 인 태양 망원경 개발을 위한 광학 및 광기계 설계를 수행하였다. 차폐가 없으며 고속 팁-틸트 기능을 부여하여 이미지를 보정하고, 태양열로 인한 열적 성능저하를 방지하는 가능을 구현할 수 있도록 광학설계를 진행하였다. 광기계 설계는 극한 환경에 적용이 가능한 반사경의 경량화 및 지지 구조의 최적화를 진행하였으며 제작성을 고려한 SiC 신소재를 사용하고, 정렬을 위한 부반사경 조절부를 채용하였다. 본 연구에서는 SEB 태양망원경의 광학 및 광기계 설계 결과를 발표할 것이다.