• Review of KIISC
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• v.11 no.2
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• pp.16-26
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• 2001

IPSsec 제품은 호스트에 구현될 수도 있고, VPN 장비의 형태일 수도 있으며, 방화벽이나 라우터에 구현되어 있을 수 도 있다. 또한, IPSec은 동일한 조직의 네트워크에서뿐만 아니라 독립된 조직의 네트워크들 사이에서도 사용될 수 있어야 하며, 따라서 여러 제품들끼리의 상호운용성이 그 사용에 있어서의 기본 요건이다 IPSec 제품의 상호운용성을 위해 IPSec 제품이 표준을 준수하고 있는지에 대한 적합성 시험과 IPSec 제품들 사이에 상호 운용 여부를 시험하는 상호운용성 시험이 필요하며, 본 논문에서는 IPSec 제품에 대한 적합성 시험과 상호운용성 시험 기술과 방법을 미국과 일본의 사례를 중심으로 조사한다.

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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• 2013.11a
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• pp.37-41
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• 2013

• The Korean Journal of Health Service Management
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• v.6 no.3
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• pp.67-74
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• 2012

This study analyzed the trend of relationship between hospital departments. Hospitals directory issued by Korean Hospital Association in 2009 was used to collect the study sample data. The study sample used 188 hospitals established during the four years from 2005 to 2008, and bed size, establishment year was identified in the directory. Population variable in 2009 was taken from the website of Statistics Korea. SAS 9.2 was used for the statistical analysis. In regression analysis, year of establishment (2008) was statistically significant in explaining the number of hospital departments. Hospitals established in 2008 showed significant positive number of department than other years. Study hospitals showed increasing number of hospital departments during four years. Further study will be needed to analyze the effects of hospital departments on their performances.

• Journal of Korean Academy of Nursing
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• v.34 no.6
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• pp.1081-1091
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• 2004

Purpose: This study was done to identify the risk factors associated with falls among patients with Parkinson's Disease(PD). Method: A retrospective study design was used through the collection of physiological and physical health, and psychosocial functions. Results: Of the 100 participants, fifty-nine(59%) reported one or more falls and seventy-one(71%) reported one or more near-falls. Anaverage 34.7 falls and 150.3 near-falls were reported in the previous year per person. Stage of PD, foot problems, balance, fear of falling, and activities of daily living were significantly associated with an increased risk of falls. Conclusion: The findings confirm the high risk of falling in PD patients. Also these results have implications for developing fall prevention programs for PD patients.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2008.04a
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• pp.145-150
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• 2008

This study proposes an improved AR-model based structural joint integrity monitoring method and a new damage sensitive feature using RMS values of impulse responses. The proposed methods were applied for joint integrity monitoring of a model scale 2-bay and 4-story steel frame structure and it was found that the AR coefficients could be more consistently estimated by adopting the band-pass filter and cross-correlation function to the raw acceleration signals and the joint damages could be successfully monitored by the proposed methods.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2009.04a
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• pp.114-118
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• 2009

이 논문에서는 울돌목 시험조류발전소에 구축 중인 구조건전성 감시시스템의 계획, 설치 및 활용에 대하여 소개하였다. 현재 시험조류발전소에 설치된 센서로는 전기저항식 변형률계, 광섬유 FBG(Fiber Bragg Grating) 센서, 압전형 MFC(Macro Fiber Composite) 센서, 2축 경사계, 서보형 가속도계 등과 같은 지지구조물의 구조거동을 감시하기 위한 센서와 토크 센서, RPM 센서 등 발전 계통에 대한 감시를 위한 센서, 그리고 H-ADCP(Horizontal Acoustic Doppler Current Profiler)와 같은 외력조건에 대한 계측 장비 등이 있다. 센서 설치 후 현재까지 부분적으로 계측된 자료를 소개하고, 향후 건전성 감시시스템 개선 계획을 소개하였다.

• Magazine of the Korea Concrete Institute
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• v.9 no.5
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• pp.225-231
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• 1997

콘크리트 압축강도 및 전단스팬비의 변화에 의한 고강도 철근콘크리트 춤이 큰 보의 전단거동 및 내력특성을 파악하기 위한 실험적 연구를 하였다. 춤이 큰 보는 하중작용점과 하중지지점을 연결하는 사균열의 확대에 의해 취성전단파괴양상을 나타내었으며 하중작용점 하중 지지점의 콘크리트 압괴를동반하는 전단압축 및 전단인장파괴 형태로 최종파괴되었다. 전단스팬비가 감소함에 따라 사균열전단응력 및 최대전단응력은 크게 증가하였으며, ACI 및 CIRIA규준식은 부재의 최대전단응력을 비교적 정확하게 예측하고 있음을 파악하였다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.11a
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• pp.179-182
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• 2007

Recently, the circuits of fluorescent light-switches are separated for window-light, middle-lights, or corridor-light, etc in most offices and classrooms in this country. Although it is clean and shiny - more than standard intensity of illumination, it is common that fluorescent lights on the side of window are lighted. In this case, we can use a fluorescent light with a sensor, which is turned on and off automatically according to the amount of sunlight. I think that this plan can save energy, reduce the budget, and increase the effect of education. and so I studied on this plan.

• Proceedings of the Korea Concrete Institute Conference
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• 1992.10a
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• pp.106-110
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• 1992

This paper is an experimental study on shear capacity of the high strength R/C beams with a shear span-depth ratio between 1.5 and 2.5. a total of 15 beams was tested to determine diagonal cracking and ultimate shear strength. The major variables are shear span-depth ratio (a/d=1.5, 2.0. 2.5) , vertical shear reinforcements ratio(Vs = 0 , 25, 50, 75, 100% ( Vs = Pv/Pv(ACI)), and concrete compressive strength (f'c= 747㎏/㎠). Test results indicate that ACI 318-89 Eq(11-31) generally underestimates shear strength carried by vertical shear reinforcements, and the mode of failure may change from shear tension to shear compression for the beams having higher Vs than 75%, thus the effectiveness of r-fy on ultimate shear strength (vu) decreased.

• Proceedings of the Korea Concrete Institute Conference
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• 1992.10a
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• pp.185-190
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• 1992

ACI318-89 Recommended that when the specified compressive strength of concrete in a column is greater than1.4 times that specified for a floor system, top surface of the column concrete shall extend 2ft(600mm)into the slab from the face of column to avoid unexpected brittle failure. The major variables are extension distance, flexural strength ratio(Mr), and shear reinforcement ratio(Vs). Test results are as follows ; (1) The failure modes of specimens under cyclic loading were concentrated at critical region from beam-column joint face. (2) Ductility index($\mu$f) were increased with increasing of shear confinement ratio and flexural strength ratio. (3)The specimens with 2ft extension distance showed more ductility than the specimens with 1ft extension distance.