• 여성건강간호학회지
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• 제20권4호
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• pp.287-296
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• 2014

Purpose: The purpose of this study was to analyze the quality of reports on observational studies published in the Korean Journal of Women Health Nursing (KJWHN). Methods: Forty-six studies using cross-sectional designs published in KJWHN from January 2011 to June 2013 were selected for analysis. Selected articles were reviewed and evaluated by three reviewers using the 22 items of the Strengthening the Reporting of Observational studies in Epidemiology (STROBE) statement. As some of 22 items had more than one check point, further broken down, 34 checklist items were used for analysis. Results: Overall, the reviewed studies provided sufficient descriptions for many STROBE items. Seven of the 34 items were found to be not applicable, and 15 of the remaining 27 items (55.5%) were evaluated as 'sufficient' in reporting. Only one study included a flow diagram illustrating participation and this lack of flow diagram was the weakest area of reporting in this review. Conclusion: Clearer reporting of cross-sectional studies can be attained by attention to vulnerable areas of reporting, such as including a flow diagram of participants, descriptions of sources of bias and reason for non-participation, and describing limitations of the study. Issues regarding the application of STROBE statement items should be actively discussed in order to aid future revision and clarification of items included in STROBE statement.

• 한국전기전자재료학회논문지
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• 제34권2호
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• pp.121-125
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• 2021

The machine vision technology has been widely used in the industrialized nations like the United States, Japan, and EU in the various industries from the late 1980s. Machine vision inspection system mainly consists of a camera, optics, illumination and an image acquisition system. Optimization of the illumination light source is very important. This paper shows a comparison between Pulse Width Modulation (PWM) control and strobe control in driving LED lighting system for machine vision. PWM control method has problems such as a temperature rising of LED and a flickering in image measurement for inspection. In contrast, the proposed strobe control method can suppress the temperature of LED light source below 40℃. Also, it can remove the flickering problem through a synchronization between a frame grabber and a camera shutter. Finally, the strobe control method was shown to extract clearer images with a high precision compared to PWM control method.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.2509-2512
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• 2005

In this paper, a position control scheme of the ink droplet is presented for the high image quality and print speed inkjet printer. The proposed scheme estimates the impact position and compensates it by control of the fire strobe time based on the dynamic equations describing the moving trajectory of the ink droplet. Compared to the conventional fire strobe control which is based on the simple synchronization the fire strobe with the position signal of the inkjet nozzle, the proposed control scheme provides more accurate impact position control during the carrier is moving with accelerated or decelerated speed as well as constant speed. The availability of printing during the acceleration and deceleration states of the carrier moving enables the print speed up and the frame size down which means the cost down.

• 수산해양기술연구
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• 제40권2호
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• pp.132-137
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• 2004

스트로보광에 대한 어류의 전기생리학적 반응을 조사하기 위하여, 전갱이에 각각 4단계의 섬광빈도(1.7~25Hz)와 강도(56~415lx${\cdot}$s)로 광자극을 주어, 그에 대한 망막활동전위 (ERG)를 조사한 결과는 다음과 같다. 1. ERG 진폭은 스트로보광을 조사한 순간에 최대가 되고, 그 후 가장 작았다가 점차 커져서 안정되는 경향을 보였다. 2. 섬광빈도에 따른 ERG 진폭은 광자극 후 약 12~17분부터 안정되는 경향을 보였다. 3. 전갱이가 받는 자극량은 섬광빈도 10Hz 에서 가장 많았고, 스트로보광 강도가 약해짐에 따라 감소하였다. 4. ERG 진폭변화는 10Hz가 가장 컸고, 스트로보광의 강도가 감소함에 따라 적었다.

• 수산해양기술연구
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• 제39권2호
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• pp.128-133
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• 2003

본 연구에서는 스트로보광의 자극효과를 검토할 목적으로 스트로보광 강도에 따른 전갱이의 반응을 심박수의 변화로 조사하였다. 실험은 10$Hz$의 스트로보광강도(75 lx$\cdot$s)를 1/2, 1/5, 1/15로 빛의 세기를 감소시켜, 4단계의 강도별로 심박수를 자극 전 10분간, 자극 중 30분간, 자극 후 20분간 합계 60분간을 2시간마다 3회 연속해서 측정하였다. 그 결과, 스트로보광자극 중의 심박수 증가와 자극 종료직후에 일시적으로 현저한 심박수 감소가 있었다. 스트로보광 자극효과는 자극강도의 감광에 따라 감소하였다. 반복실험에 의한 자극효과는 75 lx$\cdot$s의 강도보다 약한 스크로보광 강도에서는 현저하게 나타나지 않았다.

• The Journal of Korean Physical Therapy
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• 제12권1호
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• pp.41-47
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• 2000

BACKGROUND AND PURPOSE. The purpose of this study is to investigate the effect of the disturbed vision on the gait distance parameters on the healthy young population. SUBJECTS. Twenty four healthy college aged individuals are randomly assigned to both a condition with a strobe light and the other condition without a strobe light. METHODS. The instrumentation used for gait analysis is the GaitRite electronic walkway system with a personal IBM computer. The examiner naked all the subjects to walk 6 times on the gait mat without the strobe light and. 6 times on the mat with the strobe light. The first 4 trials were practice and the last two trials were recorded in both conditions. The gait parameters analyzed were as follows : velocity, cadence, step length, and heel to heel base of support. RESULTS. Paired samples t-test used for this study did not found any significant differences between the two conditions because the p-values that were analyzed on the experiment were Utter than 0.05. The gait parameters that were analyzed included cadence, velocity, left and right heel to heel base of support, and left and right step length. DISCUSSION AND CONCLUSION. Based on this population, the condition of disturbed vision via the effect of the strobe light was not significantly challenging to compromise the body's sensory systems. However, in the elderly population, these systems can undergo age related changes. Visual changes rapidly decline in people 60 to 80 years of age and changes in the vestibular system include $20-40\%$ reduction in hair cells.

• 한국정보통신학회논문지
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• 제15권8호
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• pp.1727-1734
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• 2011

본 논문에서는 잉크젯 프린터의 고품질 인쇄 및 인쇄 속도 향상을 위하여 헤드 노즐로부터 분사된 잉크 액적의 위치 제어 정밀도를 향상할 수 있는 방법을 제안한다. 샤프트를 따라 이동하고 있는 캐리지에 탑재된 잉크젯 프린터 헤드의 노즐로부터 분사 신호에 동기되어 분사된 액적의 운동 방정식을 수립하고 이로부터 액적이 용지에 도달하는 궤적을 모델링하여 탄착지점을 예측함으로써 분사 액적을 원하는 지점에 정확하게 탄착시키도록 액적 분사 신호의 타이밍을 제어하는 방법을 제안한다. 캐리지의 위치 신호와의 단순 동기에 기반을 둔 기존의 분사 제어 방법에 비해 본 논문에서 제안하는 방법은 이동하는 캐리지의 속도를 고려하여 분사 타이밍을 보상하므로 캐리지의 속도 변동에 대해서도 보다 정확한 위치 제어가 가능하여 고품질 인쇄를 구현할 수 있을 뿐만 아니라 방향 전환을 위한 가감속 구간에서도 프린팅을 가능하게 하므로 동일한 인쇄 영역에 대해서 캐리지의 이동 경로가 짧아져 인쇄 속도를 향상시킬 수 있다.

• Archives of Plastic Surgery
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• 제41권1호
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• pp.1-2
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• 2014

• 수산해양기술연구
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• 제31권4호
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• pp.379-384
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• 1995

위협광에 의한 어류의 행동제어개발을 위하여, 스트로보광에 대한 전갱이와 잉어의 명순응과정을 조사하였는데, 스트로브광의 섬광빈도는 전갱이의 경우, 1.7, 5, 10, 25, 430Hz의 5단계, 잉어의 경우는 1.7, 5, 25Hz의 3단계로 하였다. 안구표본의 채취는 조사전과 조사직후부터 1, 5, 10, 30분 경과마다 행하였고, 채취한 각 표본은 종단조직절편을 만들고 현미경 관찰을 행하였다. 망막의 순응율은 원추체지수를 구하여 나타내었다. 조사시간에 따른 평균 순응율은; \circled1 전갱이의 경우, 광조사전의 27%가 1, 5, 10, 30분 경과 시마다 각각 42.6%, 49.8%, 59.8%, 83.1%로 증가하였다. \circled2 잉어의 경우, 광조사전의 28.4%가 1, 5, 30분 경과 시마다 각각 51%, 54.9%, 91.3%로 되었다. 명순응과정은; \circled1 전갱이의 경우 430Hz, 25Hz, 5Hz, 1.7Hz, 10Hz의 순으로, \circled2 잉어의 경우는 25Hz, 5Hz, 1.7Hz의 순으로 대략 빨랐다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제5권6호
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• pp.1113-1132
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• 2011

In wireless sensor networks (WSNs), most energy saving asynchronous MAC protocols are custom tailored for unicast communications only. However, broadcast protocols are very commonly used in WSNs for a variety of functionalities, such as gathering network topology information, event monitoring and query processing. In this paper, we propose a novel low-power asynchronous broadcast MAC protocol called Alarm Broadcast (A-CAST). A-CAST employs the strobe preamble that specifies the residual waiting time for the following data transmission. Each receiver goes back to sleep upon hearing the strobe preamble for the residual time duration, to conserve energy and to wake up just before data transmission starts. We compute the energy consumption of A-CAST via rigorous mathematical analysis. The analytic results show that A-CAST outperforms B-CAST, a simple broadcast extension of the well-known B-MAC. We also implement A-CAST on sensor motes and evaluated its performance through real experiments. Our experimental results show that A-CAST reduces the energy consumption by up to 222% compared to the previously proposed protocols.