• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2001년도 가을 학술발표회 논문집
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• pp.253-260
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• 2001

In a structural inverse problem with a limitation to the number of measuring degrees of freedom, the selection of optimal sensor locations (OSL) is critical for a good result. The current research proposes and a new OSL method and compares it with a widely used OSL method. The proposed method utilizes the sensitivity of eigenvectors with respect to the structural parameters. A simulation study for a tower structure is carried out. The structural parameters are estimated by a SI method. The influences of OSL on SI results are investigated.

• Journal of Radiation Protection and Research
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• 제36권2호
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• pp.52-58
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• 2011

이 연구에서는 소골 유적 29호 및 29-1호 주거지 내부에 사용 시기를 달리하여 존재하는 3개의 화덕자리에 대한 광자극발광(OSL) 연대측정을 수행하였다. 연대측정에 앞서 석영 시료의 자연 OSL 신호 관찰 및 절대영년도 평가를 수행한 결과, OSL 신호는 광이온화 단면적이 커 열과 빛에 매우 민감한 fast 성분만으로 이루어졌으며 청동기인들의 일반적인 난방 및 취사 온도인 $300^{\circ}C$ 이하에서도 완벽히 절대영년 됨을 알 수 있었다. 각 시료의 고고선량은 단일시료재현법을 적용한 재현성 평가와 플래토우 평가로부터 산출되었고, 이를 연간선량율로 나누어 OSL 연대를 결정하였다. 이후 산출된 OSL 연대의 정밀도를 높이기 위하여 발굴조사를 통해 파악된 화덕자리의 사용 시기와 각 화덕자리의 OSL 연대를 베이지안 통계에 적용한 결과, 개별 화덕자리의 사용 및 폐기 시점에 대한 높은 정밀도를 갖는 OSL 연대가 최종적으로 확정되었다.

• Journal of Radiation Protection and Research
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• 제42권1호
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• pp.69-76
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• 2017

Background: Time-resolved optically stimulated luminescence (TR-OSL) is a very useful method for calculating the lifetimes of crystalline quartz and feldspar. Materials and Methods: A compact TR-OSL system was developed, comprising a heater assembly manufactured using Kanthal wire, 2 powerful blue light-emitting diodes (LED, LXHL-PB02) for optical stimulation equipped with VIS liquid light guides, and a photomultiplier tube combined with an optical filter for luminescence detection. A pulse generated from the data acquisition board (NI PCI 6250) was used to initiate on/off signals in LED and TR-OSL measurements. Results and Discussion: The TR-OSL and background signals measured using this TR-OSL system using quartz samples were very similar to those reported in a previous study. Additionally, the lifetimes of the build-up and TR-OSL signals were calculated as $27.4{\pm}2.2{\mu}s$ and $30.3{\pm}0.6{\mu}s$, respectively, in good agreement with the findings of a previous study. Conclusion: It was concluded that the developed TR-OSL system was very reliable for TR-OSL signal measurements and lifetime calculations.

• 패션비즈니스
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• 제1권2호
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• pp.55-64
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• 1997

This study adapted OSL (Optimum Stimulation Level) to induce the customer's behavior, especially customer's fashion behavior. The purpose of the fashion advertisement was to accelerate the purchasing desire for the clothes by catching the customer's attention. OSL is one of the methods. OSL can satisfy customers' desires using the new stimulation that reveals a customer's individual characters. In general, women are more concern about fashion and sensitive to the clothes of new fashion than men. But nowadays, many of the men are also concern about their appearance and fashion. The differences between men and women in fashion behavior and in each factor, of OSL, especially a relationship between OSL factor and fashion behavior are researched in this study. Such differences analyzed to find the sources that can satisfy their various desires. This study was expected to provide good information to plan advertising strategy in unpredictable market situation. The subjects for this study were 308 male and female university students. Mehrabian and Russell (1974),s ASTS(Arousal Seeking Tendency Scale) was adapted to measure the OSL, and twenty questions regarding fashion leadership and clothing importance released by Kwon, Shin, Lee, are adapted to measure the fashion behavior. An ANOVA was used as statistical analyzing method to find out the difference between men and women in fashion behavior. The relationship between fashion behavior and difference between men and women in OSL factors were measured by MANOVA. Conclusions were as follows; 1. In consciousness degree of fashion leadership and clothing importance in the fashion behavior, women were higher than men. 2. There was a difference between men and women in OSL's each factors in "unusual stimuli" and "sensuality", but there is no significant statistical difference in factors of "change", "risk", "new environment". Therefore women are higher than men in the stimulation level of "unusual stimuli" and" sensuality". 3. Low element of OSL relating to fashion behavior is from "change" and "unusual stimuli". 4. For the relationship between OSL and fashion behavior, fashion leadership and clothing importance were recognized better in the group of higher level of "change" and "unusual stimuli" irrespective of sex. In the case of "change" which is one of OSL factors, High OSL groups were higher than low OSL groups in the consciousness level of the fashion leadership and clothing importance. In men's case, High OSL-Change groups were higher than Low OSL-Change groups in the fashion leadership, but there was no difference between two groups in the consciousness of the clothing importance. In the case of "Unusual Stimuli", High OSL groups were superior to Low OSL groups in the fashion leadership, but there was no significant difference between two groups in the clothing importance. In women's case, High OSL-Change groups were superior to Low OSL-Change groups. In the case of "Unusual Stimuli", High OSL groups were superior to Low OSL groups in the fashion leadership, but there was no difference between two groups in the clothing importance.

• 한국지형학회지
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• 제28권2호
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• pp.59-70
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• 2021

This study aims to determine the sunlight exposure according to depositional environment to improve the accuracy of optically simulated luminescence (OSL) dating. Sufficient sunlight exposure during transportation of sediment is a basic assumption of the OSL dating, and if the process does not occur enough, the results may be overestimated compared to the actual depositional age. Therefore, the main purpose of this study is to establish a correction method by determining residual or unbleachable dose after sunlight exposure in the actual deposition process, not in the laboratory measurement. Four samples from two sites were collected according to the depositional environment from rivers and coasts, and various OSL signals, including the size of residual dose, degree of dispersion between grains, and OSL signal sensitivity, were measured. As a result, it was confirmed that sediments formed under temporarily high energy environments, such as floods and surges, had relatively high residual dose or large dispersion of residual dose between particles. In further studies, the OSL signal characteristics of river sediments by flow velocity will be identified and the relationship between energy and OSL signal characteristics will be identified in more detail. Moreover, a method of reconstructing the paleo-environment at the time of deposition for existing sediments will be devised. It is expected to provide important information for the frequency of disaster recurrence and prediction of future climate change.

• 한국제4기학회지
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• 제20권1호
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• pp.28-38
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• 2006

1896년 Becquerel에 의해 우라늄의 방사능이 발견된 후, 방사붕괴 원리를 이용한 수많은 연대측정법이 개발되었고, 분석기기도 정밀화되면서 그 정확도도 날로 높아지고 있다. 방사성동위원소 연대측정법 중에서 ${14}^C$ 측정분야는 고고학에 있어서 최적의 연대측정법으로서 고고학 발전에 많은 도움이 되어왔다. 그러나 ${14}^C$ 측정법에 이용되는 유기물을 포함하는 시료가 문화층에 존재하지 않는 경우도 있어 다른 연대측정법이 필요하 다. 이러한 문제의 해결을 위해 현재 OSL연대측정법 (Optically Stimulated Luminescence dating method) 이 고고학 분야에서 자주 응용되고 있다. 본 연구 목적은 OSL의 고고학적 적용을 위한 시료채취와 적용상 문제점 등에 대해 검토하는데 있다.

• 한국지형학회지
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• 제25권4호
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• pp.63-75
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• 2018

The lower marine terrace 1 and 2 surfaces distributed between Ulsan and Pohang coast in the southeastern coast of the Korean penninsula have been correlated with MIS 5e and 5a (or 5c) by amino acid dates, 14C dates, wide-spread tephra correlation and pollen analysis respectively. In this study, to test the reliability of the OSL method for the estimation of the numerical burial age of marine sediment deposits, we analyzed the samples from the marine terraces which have been known as typical marine terraces formed during MIS 5e and MIS 5a in the above-mentioned coast. The burial ages of the marine deposit of the lower marine terrace 1 and 2, with paleoshoreline altitudes of 18m to 19m and 10m to 11m respectively, both showed about the same age of 60 ka BP. The lower marine terraces 1 and 2, however, were divided into two terrace surfaces by a clear terrace cliff. Besides, the OSL dates of the lower and upper parts of the lower marine terrace 2 of the Bonggil coast showed the reversed burial ages. In the lower marine terrace 1 of the Sanhari coast, almost the same burial ages were derived from both the lower part (marine rounded gravel layer) and the upper part (terrestrial angular gravel layer) of the terrace deposit. Therefore, at the present time, judging from only the OSL dates measured in this study, it could be argued that the OSL method is not the best for the estimation of forming periods of the lower marine terraces 1 and 2 and their classification.

• 분석과학
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• 제29권6호
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• pp.269-276
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• 2016

고산리 유적은 우리나라 최초 토기로 알려진 고산리식 토기가 출토된 초기 신석기시대 유적이다. 이 연구에서는 고산리 유적의 형성 및 점유에 대한 절대연대 편년을 위하여 유적 내 표준 퇴적층에서 채취된 시료를 대상으로 OSL 연대측정을 수행하였다. 각 퇴적층의 고고선량은 $220^{\circ}C$ 열전처리 온도의 단일시료재현법을 적용하여 산출되었으며, 최종적으로 유적의 퇴적환경을 고려하여 maximum age model을 적용하여 결정하였다. 산출된 고고선량을 연간선량율로 나누어 고산리 유적 퇴적층의 OSL 연대를 결정하였다. 각 퇴적층의 OSL 연대와 14C 연대를 종합한 결과, 고산리 유적은 신석기인들에 의해 기원전 9천년 이후에 형성된 이후 고산리식 토기를 포함하는 신석기시대 초기 유적에서부터 다양한 시기의 다양한 유구가 존재해 오다가 기원전 4천년 중반에 폐기되어 현재에 이르렀다고 추론된다.

• 분석과학
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• 제25권5호
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• pp.324-332
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• 2012

백제 한성기의 왕성으로 알려진 풍납토성의 축조연대는 고고학 분야의 대표적인 논쟁사항 중 하나이다. 이 연구에서는 풍납토성의 축조연대 편년을 위해 7 개의 토기 시료에 대하여 OSL 연대측정을 수행하였다. 연대측정에 앞서 TL/OSL 신호 관찰 및 절대영년도 평가, 재현성 평가를 수행한 결과, 풍납토성 토기 시료는 절대영년이 완벽히 이루어졌으며 고고선량은 $220^{\circ}C$ 열전처리 온도의 단일시료재현법으로부터 신뢰도 높은 값이 산출되었다. 산출된 고고선량을 연간선량율로 나누어 풍납토성 토기 시료의 OSL 연대를 결정하였다. 풍납토성의 축조연대 편년을 위해 각 토기 시료의 OSL 연대와 고고학적 맥락, 14C 연대 등을 종합하여 판단한 결과, 풍납토성의 초축시점을 $294{\pm}52$ yrs AD ($1{\sigma}$ SE), 제 III 단계 증축을 $328{\pm}30$ yrs AD ($1{\sigma}$ SE), 최종성벽의 완성을 $400{\pm}76$ yrs AD ($1{\sigma}$ SE)로 비정하였다. 따라서 풍납토성은 서기 3세기 후반에 초축된 이후 475년 백제의 웅진천도 이전까지 여러 번의 중축 및 개축이 이루어졌음을 알 수 있었다.

• 보존과학회지
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• 제34권6호
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• pp.481-492
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• 2018

이 연구에서는 19세기 말부터 20세기 후반까지 사용된 것으로 알려진 오송 봉산리 옹기가마 유적에서 채취된 가마벽체 시료를 대상으로 TL/OSL 연대측정을 수행하였다. 고고선량은 SAR-TL/OSL법을 이용하여 측정된 매장기간 동안 시료에 축적된 흡수선량($ED_{burial}$), 배경선량($ED_{BG}$), fading 보정인자(f), 과대산출 보정인자(C)로부터 결정되었다. 또한 연간선량율 및 원산지는 시료의 자연방사능핵종($^{238}U$, $^{232}Th$, $^{40}K$)을 분석하여 산출되었다. 각 옹기가마의 TL/OSL 연대와 방사성탄소 연대를 비교 검토한 결과, 본 유적과 같은 근 현대 고고유적의 절대연대 편년을 위해서는 TL/OSL 연대측정과 방사성탄소 연대측정을 함께 수행하여 결합연대를 산출하는 것이 타당하다고 판단되었다. 오송 봉산리 옹기가마 유적의 조성 및 운영시기가 I 단계(5호, 6호 옹기가마) ${\rightarrow}$ II 단계(1호, 2호, 3호 옹기가마) ${\rightarrow}$ III 단계(4호 옹기가마)로 변천된다는 사실에 근거하여 베이지안 통계분석을 수행한 결과, 가장 이른 시기인 I 단계 옹기가마들의 사용 및 폐기시점은 $1910{\pm}23$년, II 단계는 $1970{\pm}10$년, III 단계는 $1987{\pm}4$년으로 각각 절대연대 편년되었으며, 이는 고고학적 편년관과도 정확히 일치하였다.