• Asian Pacific Journal of Cancer Prevention
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• 제13권11호
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• pp.5791-5797
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• 2012

Introduction: Return-to-work (RTW) can be a problematic occupational issue with detrimental impact on the quality of life of previously-employed breast cancer survivors. This study explored barriers and facilitators encountered during the RTW process in the area of cancer survivorship. Materials and Methods: Six focus groups were conducted using a semi-structured interview guide on 40 informants (employed multiethnic survivors). Survivors were stratified into three groups for successfully RTW, and another three groups of survivors who were unable to return to work. Each of the three groups was ethnically homogeneous. Thematic analysis using a constant comparative approach was aided by in vivo software. Results: Participants shared numerous barriers and facilitators which directly or interactively affect RTW. Key barriers were physical-psychological after-effects of treatment, fear of potential environment hazards, high physical job demand, intrusive negative thoughts and overprotective family. Key facilitators were social support, employer support, and regard for financial independence. Across ethnic groups, the main facilitators were financial-independence (for Chinese), and socialisation opportunity (for Malay). A key barrier was after-effects of treatment, expressed across all ethnic groups. Conclusions: Numerous barriers were identified in the non-RTW survivors. Health professionals and especially occupational therapists should be consulted to assist the increasing survivors by providing occupational rehabilitation to enhance RTW amongst employed survivors. Future research to identify prognostic factors can guide clinical efforts to restore cancer survivors to their desired level/type of occupational functioning for productivity and wellbeing.

• 대한기계학회논문집B
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• 제24권1호
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• pp.21-28
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• 2000

Although commercial PIV systems have been widely used for the non-intrusive velocity field measurement of fluid flows, they are still under development and have considerable room for improvement. In this study, a single-frame double-exposure PIV system using a high-resolution CCD camera was developed. A pulsed Nd:Yag laser and high-resolution CCD camera were synchronized by a home-made control circuit. In order to resolve the directional ambiguity problem encountered in the single-frame PIV technique, the second particle image was genuinely shifted in the CCD sensor array during the time interval dt. The velocity vector field was determined by calculating the displacement vector at each interrogation window using cross-correlation with 50% overlapping. In order to check the effect of spatial resolution of CCD camera on the accuracy of PIV velocity field measurement, the developed PIV system with three different resolution modes of the CCD camera (512 ${\times}$ 512, lK ${\times}$ IK, 2K ${\times}$ 2K) was applied to a turbulent flow which simulate the Zn plating process of a steel strip. The experimental model consists of a snout and a moving belt. Aluminum flakes about $1{\mu}m$ diameter were used as scattering particles for the liquid flow in the zinc pot and the gas flow above the zinc surface was seeded with atomized olive oil with an average diameter of 1-$3{\mu}m$. Velocity field measurements were carried out at the strip speed $V_s$=1.0 m/s. The 2K ${\times}$ 2K high-resolution PIV technique was significantly superior compared to the smaller pixel resolution PIV system. For the cases of 512 ${\times}$ 512 and 1K ${\times}$ 1K pixel resolution PIV system, it was difficult to get accurate flow structure of viscous flow near the wall and small vortex structure in the region of large velocity gradient.

• 수산해양기술연구
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• 제47권3호
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• pp.214-221
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• 2011

This study was performed to develop a video based system which can be used to measure the averaged fish size in a non-intrusive fashion. The design was based on principles of simple stereo geometry, incorporated fish dimensions weight relationships and took into consideration fish movement to lower system costs. As the fish size is an important factor that impacts the economy of an aquaculture enterprise. Size measurements, including fork length, width or height, girth, thickness and mass, can be used to determine fish condition in the fish farm, so the averaged fish size of fish cage needs to consistently monitor in open ocean aquaculture cage. A precision of ${\pm}3%$ for replicate length measurements of a 60cm bar is obtained at distances between 2.0 and 6.0m, and the mean fork length and mean swimming speed of bluefin tuna were estimated to 48.8cm and 0.78FL/s, respectively.

• 한국진공학회지
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• 제15권1호
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• pp.24-30
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• 2006

광학공동 적분 투과 분광법(integrated cavity output spectroscopy, ICOS)은 파장가변 레이저와 광학공동을 이용해 미량기체의 절대 밀도를 고감도로 측정할 수 있는 실시간 흡수 분광계측 기법이다. 이 기법은 압전 소자를 이용해 길이가 변조되는 고 피네스(high finesse) 파브리-페로 공동(Fabry-Perot cavity)을 공명 투과하는 연속파 파장 변조 레이저의 적분 출력으로 부터 공동 내부 시료의 분광 흡수량을 측정하는 원리를 이용한다. 본 연구에서는 764,7nm 파장 근처에서 파장이 변조되는 외부 공진기 반도체 레이저를 광원으로 사용하고, $99.997\%$의 높은 반사율을 갖는 거울로 구성된 파브리-페로 공동을 이용해 파장에 따른 투과 감쇠 신호를 발생시키는 실험 장치를 구성하였다. 산소 기체에 대한 측정 실험을 수행한 결과, 최소 흡수계수 $8.45\times10^{-8}cm^{-1}$에 해당하는 미량기체 밀도를 측정할 수 있는 성능을 얻었다.

• 한국광물학회지
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• 제10권2호
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• pp.126-138
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• 1997

Serpentinite of the Yesan-Gongju-Cheongyang area has been formed by serpentinization of ultramafic rocks. The ultramafic rock might be composed mainly of oilvine with minor pyroxene and amphibole. Olivine has a considerably restricted chemical compositional ranging from Fo90 to Fo93. Fresh serpentinite containing large amount of oilvine is usually massive in occurrence and dark green to black in color. Serpentine minerals occur not only as major mineral of serpentinite, but also as remnants in the talc ore which was formed from serpentinite. XRD study indicates that antigorie is the most abundant serpentine mineral of the serpentinite. Serpentinite consisting of antigorite usually shows non-pseudomorphic texture, whereas that consisting of lizardite shows pseudomorphic texture. Antigorite is found along the margins or fractures of olivine grains resulting in the formation of network of magnetite which was formed at the time of serpentinization. Lizardite, subordinate constituent mineral of serpentinite, frequently shows pseudomorphic mesh-texture after olivine. The chemical differences between antigorite and lizardite/chrysotile are small, so both minerals are not easily discernible with the electron microprobe. Antigorite occuers as elongate blades, flakes, or plates forming interpenetrating texture to obliterate previous textures. SEM study also shows that most serpentine minerals occur in platy or tabular form rather than in asbestiform. Fractures formed after main serpentinization are observed within the pseudomorphic central olivine grain. Careful observation of the serpentine pseudomorphs gives a great deal of data on the pre-serpentinization nature of the serpentine pseudomorphs gives a great deal of data on the pre-serpentinization nature of the ultramafic rocks. It is inferred that the serpentinization took place after the emplacement of ultramafic body into the relatively wet environment ceased and the cooling intrusive body crossed into the stability field of serpentine. It is inferred that the final pervasive serpentinization took place over a long time, by hydrothermal water supplied through the fracture system produced during emplacement of ultramafic rock.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2009년도 학술대회
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• pp.976-983
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• 2009

앰비언트 인포메이션 시스템(Ambient Information System)은 앰비언트 디스플레이(우리 주변에서의 빛과 소리 움직임의 미묘한 변화를 통하여 공간 안에서 정보를 보여주는 미디어)의 확장된 개념으로써 비관입적인 방법으로 정보를 전달한다[4]. 최근 사용자 개인의 감각과 경험에 영향을 주는 미디어의 중요성이 증대되고 있을 뿐만 아니라, 공공 장소에서의 앰비언트 인포메이션 시스템의 역할도 증대되고 있는 실정이다. 따라서 본 논문에서는 공공 장소에서의 정보 인식에 대하여 여러 가지 디자인 요소를 비추어 봤을 때 가장 적합한 시스템 형태를 찾고 그것을 활용하는 데에 주안점을 두었다. 우리는 기존 연구를 토대로, 앰비언트 인포메이션 시스템의 실제적 활용에서 숙고해야 할 디자인 요소를 13가지로 추출하였다. 또한 이를 검증하기 위하여 'Followingflow'라고 명명한 인터랙티브 조명을 설치하고 실험하였다. 그 결과, 정보에 따른 추상적 패턴 정의 시 누구라도 이해할 수 있도록 '통상적인 멘탈 모델'을 고려할 필요가 있다고 사료되었다. 또한 공공 장소에 적합한 정보는 날씨와 같은 알려져도 좋을 사실과 소수 그룹의 정보라도 행인이 알 수 없다면 좋다고 여겼다.

• 한국정보통신학회논문지
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• 제6권2호
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• pp.207-213
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• 2002

지문은 개인마다 서로 다르고 평생 변하지 않는 특성이 있다. 그리고 식별 성능에 대한 신뢰도와 보안성이 높아 여러 생체인식분야에 보편적으로 적용되고 있으며 본인임을 인증할 수 있는 가장 우수 한 방법으로 주목받고 있다 본 논문에서는 현재 빠른 속도로 발전하고 대중화되어 가고 있는 인터넷에 기반한 전자상거래, 인터넷뱅킹, 주식거래, 쇼핑몰 등의 서비스 이용시 본인인증의 신뢰도를 높이기 위해 웹 사이트 로그인에 개인 지문인증을 적용한다. 본 논문에서 구현한 지문인증을 이용한 웹 사이트 로그인 시스템은 지문인증을 위한 임베디드 모듈, 웹 서버, 그리고 웹 사이트로 구성된다. 본 논문에서는 지문인증을 웹 서버에서 수행하는 기존 시스템과는 달리 클라이언트 측에서 지문인증을 수행함으로써 서버의 부하를 줄일 수 있게 하였다. 그리고 지문인증의 성공 없이는 웹 사이트 로그인을 차단함으로써 본인인증이 필요한 인터넷 서비스의 신뢰도를 높이 수 있을 것이다.

• 대한기계학회논문집B
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• 제22권4호
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• pp.468-480
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• 1998

The temporal and spatial distributions of soot volume fractions were measured for single toluene droplet flames as a function of pressure under the normal-gravity condition. In order to characterize the transient nature of the flame and sooting regions, a full-field light extinction and subsequent tomographic inversion technique was used. The reduction in sooting as a function of pressure was assessed by comparison of the maximum soot volume fractions at several vertical positions along the axis above the droplet. The maximum soot volume fraction was reduced by 70% when the pressure was reduced by 60% from 1 atm to 0.4 atm. The reduction in sooting is attributed to variation of the geometric configuration of flame which reduces the system Grashof number as well as only the change in the adiabatic flame temperature as the pressure decreases. The gravimetrically-measured total soot yield was also compared to the optically-measured soot volume fraction to obtain a correlation between the two measurements. As a result, the total soot yield was linearly proportional to the optically-measured maximum soot volume fraction and linearly reduced as the pressure decreased. Accordingly, the non-intrusive full-field light extinction-measurements were able to be calibrated not only to measure soot volume fraction, but to simultaneously evaluate the total soot yield emitted from the toluene droplet flame (which is useful in the practical application).

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 추계종합학술대회
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• pp.227-232
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• 2003

본 논문에서는 다양한 조명하에서 실시간으로 눈을 검출하고 추적하는 새로운 방법을 제안하고자 한다. 기존의 능동적 적외선을 이용한 눈 검출 및 추적 방법은 외부의 조명에 매우 민감하게 반응하는 문제점을 가지고 있으므로, 본 논문에서는 적외선 조명을 이용한 밝은 동공 효과와 전형적인 외형을 기반으로 한 사물 인식 기술을 결합하여 외부 조명의 간섭으로 밝은 동공 효과가 나타나지 않는 경우에도 견실하게 눈을 검출하고 추적 할 수 있는 방법을 제안한다. 눈 검출과 추적을 위해 SVM과 평균 이동 추적방법을 사용하였고, 적외선 조명과 카메라를 포함한 영상 획득 장치를 구성하여 제안된 방법이 효율적으로 다양한 조명하에서 눈 검출과 추적을 할 수 있음을 보여 주었다.

• 대한의용생체공학회:의공학회지
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• 제35권4호
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• pp.87-94
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• 2014

Recent technological advances have increased interest in personal health monitoring. Electrocardiogram(ECG) monitoring is a basic healthcare activity and can provide decisive information regarding cardiovascular system status. In this study, we developed a capacitive ECG measurement system that can be included within a cloth mattress pad. The device permits ECG data to be obtained during sleep by using capacitive electrodes. However, it is difficult to detect R-wave peaks automatically because signals obtained from the system can include a high level of noise from various sources. Because R-peak detection is important in ECG applications, we developed an algorithm that can reduce noise and improve detection accuracy under noisy conditions. Algorithm reliability was evaluated by determining its sensitivity(Se), positive predictivity(+P), and error rate(Er) by using data from the MIT-BIH Polysomnographic Database and from our capacitive ECG system. The results showed that Se = 99.75%, +P = 99.77%, and Er = 0.47% for MIT-BIH Polysomnographic Database while Se = 96.47%, +P = 99.32%, and Er = 4.34% for our capacitive ECG system. Based on those results, we conclude that our R-peak detection method is capable of providing useful ECG information, even under noisy signal conditions.