• Journal of the Earthquake Engineering Society of Korea
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• v.12 no.5
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• pp.31-38
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• 2008

Recently the necessity of time history analyses is increasing for the seismic analyses of a structure, and the seismic design provisions of IBC2003, ASCE and KBC2005 require the use of a minimum of seven earthquake records for the time history analyses. Earthquake records for the time history analyses could be selected from the database of the field-measured earthquake records having similar site conditions with the designed site, or from simulated sites satisfying the design spectrum. However, in this study seven earthquake records were generated using 50 earthquake records, classified as records measured at the rock, in the database of the Pacific Earthquake Research Center (PEER). Seven earthquake records were first selected by the least squares fitting method comparing the scaling factored response spectra with the specified design spectrum, and a family of seven artificial time history earthquake records was ultimately generated by multiplying scaling factors, which were calculated by the least squares fitting method and the SRSS averaging method, to the corresponding selected earthquake records.

• Proceedings of the KAIS Fall Conference
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• 2010.11a
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• pp.382-385
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• 2010

컴퓨터가 우리 생활에 밀접하게 관련된 만큼 각종 범죄에서도 컴퓨터와 관련된 사건이 증가하고 있다. 범죄와 관련된 컴퓨터에서 법정에 제출하기 위해 증거를 분석하고 제출하는 과정을 디지털 포렌식이라 한다. 대표적인 포렌식으로는 사용자의 행위를 기록한 로그 분석이 있다. 반대로 증거 분석을 방해하는 과정을 안티 디지털 포렌식이라 한다. 본 논문에서는 시스템 시간을 변경해 로그 기록시간을 허위로 기록할 수 있는 가능성과 해결 방안을 알아본다.

• The Korean Journal of Archival Studies
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• no.69
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• pp.153-187
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• 2021

Narrative runs through the entire human life. 'Narrative' is a means of understanding and experiencing human life. The past, the present and the future are not disconnected. The past is open to the future. The future defines the meaning of the past, and the past rreturn as the horizon of life. Past, present and future temporality functions as a Narrative. Records reproduce the past time as Narrative, and recount the past according to reading behavior. Reality and records complement each other with a cyclic and dialectic structure. This paper examines the relationship between reality and records. This paper applies Paul Ricoeur's Hermeneutics to records as a tool to examine the relationship between reality and record. We want to look at how records interpret and relates to reality, and how social justice of collective memory should be should be achieved against them.

• Journal of the Earthquake Engineering Society of Korea
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• v.12 no.1
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• pp.89-95
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• 2008

Until recently lots of time-history seismic analyses were performed with the earthquake motions recorded at the soft soil surface without taking into account the effects of the soft soil amplification. However, it is important to utilize the bedrock seismic motions for the rational seismic analyses of a structure considering the site soil conditions. In this study, 26 bedrock earthquake records were selected from publicly available 1557 seismic records provided by the Pacific Earthquake Engineering Research Center (PEER) for the study, and the characteristics of them were investigated. Study results showed that it is not reasonable to estimate earthquake acceleration intensity from the magnitude of an earthquake without considering the site soil conditions and it is also hard to draw any general relationships between earthquake acceleration intensity, earthquake magnitude and epicenter distance with bedrock earthquake records in the PEER database. However, 26 bedrock earthquake records selected in this study can be utilized for the time-history seismic analyses of a structure-soil system as bedrock earthquake ones, and it is also confirmed that it is necessary to take into account acceleration intensity, magnitude, epicenter distance and site conditions simultaneously for the proper use of those selected earthquake records.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.2
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• pp.86-89
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• 2018

This paper introduces a ZigBee network-based four-lane lap time measurement system that can be set up for short-distance races. The instructions "Ready-Set-Go" can be announced at the entry point node when the start button is pushed, and foot switches installed at the exit point node can be stepped on by the runner for lap time measurement of the race. The start and exit point nodes are connected to a ZigBee network to communicate time synchronization packets. The exit point node maintains synchronized local time within 10 ms at most. The system does not need expensive measurement equipment and provides lap time recording in a more convenient manner than conventional lap time measurement methods.

• Proceedings of the Korea Multimedia Society Conference
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• 2012.05a
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• pp.160-163
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• 2012

시간관리는 자기조절관리의 중요한 요인으로 자리매김하면서 중요한 학습전략으로 채택되고 있다. 이에 따라, 최근까지 웹이나 스마트폰에서 시간을 관리하는 응용들이 많이 개발되고 있다. 하지만, 기존의 프로그램들을 본다면 현재와 과거를 기록하는 형식이 주를 이루었고 시간이 중심이었지 이를 공간과 함께 고려하지는 않았다. 하지만 본 연구는 웹을 기반으로 하여 시간과 공간을 함께 고려한 사용자 히스토리 기록과 미래를 설계할 수 있는 응용 프로그램을 개발한다. 본 연구에서는 미래도 함께 계획할 수 있게 구성되었고 시간과 함께 공간도 기록할 수 있다는 점에서 다른 기존의 프로그램 차별화를 이룬다. 또한, 학생들이 미래를 계획할 때 부모가 일방적으로 지도하는 것이 아니라 조언자로서의 역할을 하여 학생들과 상호작용을 할 수 있는 장점을 가진다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.10
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• pp.2068-2079
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• 2015

Recently, interesting in flexible working has been increased, and some central government and large companies are conducting flexible working. With the conducting of flexible working, workers are able to get a convenience but the cost of managing is increased. In this paper, we suggest a method of reducing the cost and managing efficiently. Our study determines the position of the workers using indoor localization techniques through the Wi-Fi fingerprint and smartphone, and records the office hours. The previous time and attendance systems have to install attendance recording device(e.g. Fingerprint Attendance System, RFID Card Attendance System) and are needed to manipulate manually. Our system doesn't need to install extra devices, and also doesn't need to manipulate manually. Our system automatically records the office hours. Also most of previous time and attendance systems have another weakness. They only record data when workers start and stop work. But our system exactly records office hours for each workplaces. In this paper, We introduce an effective time and attendance system in variety flexible working. Our experiments shows that our system workers' detected office hours accurately. The accuracy of our time and attendance system was 98.7%.

• Quality Improvement in Health Care
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• v.15 no.1
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• pp.113-120
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• 2009

문제: 의무기록 질 관리의 어려움 목적: 의무기록의 질 향상 의료기관: 고려대학교 의료원 안암병원 의료정보팀 질 향상 활동: 의무기록의 질 향상을 위해 입퇴원기록지 24시간 이내 작성율 향상, 입원기록지 24시간 이내 작성율 향상, 외과계 N-C 기재율 감소, 경과기록지 작성율 향상, 일일입퇴원기록지 작성율 향상, STAFF 서명 완성일 단축 활동을 하였다. 개선효과: 의무기록 작성에서 같은 내용을 반복 작성해야 하는 번거로움을 해소하였고, 작성자(의료진) 중심의 프로그램 개선과 개발된 프로그램의 지속적인 모니터링으로 의무기록의 질이 향상되었다.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.36D no.10
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• pp.61-70
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• 1999

In this paper, we analyze several exposure time schedules to obtain uniform multiple hologram and measure the diffraction efficiencies of holograms stored in $LiNbO_3$:Fe(0.015wt%) crystal through experiments. The minimum angular selectivity and the intensity ration of two incident beams are investigated precisely by the high resolution system(minimum angle : $0.0028^{\circ}$). Considering initial recording time, total exposure time and time constants, the efficiency distribution(0.014 ${\pm}$ 0.005%) of 100 holograms is measured and the 330 analog images are recorded in the same place. Also, total 500 holograms are retrieved by spatial multiplexing.

• Proceedings of the Optical Society of Korea Conference
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• 1999.08a
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• pp.36-37
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• 1999