• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.191-193
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• 2011

클라우드 환경에서 스팟 인스턴스(spot instance)는 사용자가 제시한 입찰 가격으로 클라우드 내의 자원을 활용하도록 해 준다. 그러나 사용자의 입찰 가격이 클라우드 자원 가격보다 높으면 작업 실패가 발생하고 이로 인해 작업 완료 시간의 지연과 서비스 품질의 저하를 야기한다. 이 문제에 효과적으로 대처하기 위해, 본 논문에서는 시간 문턱치 기반의 검사점(time threshold-based checkpointing) 기법을 제안하고, 시뮬레이션을 통하여 작업 수행 시간과 비용 절감 관점에서 기존 기법과 비교 분석한다.

• Sleep Medicine and Psychophysiology
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• v.8 no.2
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• pp.129-137
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• 2001

Objectives: The purpose of this study is to investigate the effects of 38-hour sleep deprivation on fine motor performance. The Motor Performance Series (MPS) in the Vienna Test System (computerized neurocognitive function tests) was used in this study. Methods: Twenty four subjects participated in this study. Subjects had no past history of psychiatric disorders and physical illness. Subjects had normal sleep-waking cycle without current sleep disturbances and were all right-handed (Annett's Hand Preference Questionnaire: above +9 points). To minimize the learning effects, familiarization with the Vienna Test System was performed one day before the study. Subjects were to get up at 6:00 in the morning after getting enough sleep according to his or her usual sleep-wake cycle. After awakening, subjects remained awake for 38 hours under continuous surveillance. During two consecutive study days, the subjects tested MPS at 7 AM and 7 PM each day, which means the MPS was done four times in total. During the experiment, anything that could affect the subjects' sleep such as coffee, tea, alcohol, a nap, tiring sports, and all medications were prohibited. Results: In MPS, the fine motor functions of both hands decreased after 38 hours of sleep deprivation. The decrement in motor performance was prominent in the dominant right hand. In the right hand, the total number of tapping was reduced (p<.005), and the number of misses (p<.05) and the length of misses (p<.05) of line tracking, the total length of inserting a short pin (p<.01), the total length of inserting a long pin (p<.05), and the number of misses in aiming (p<.05) increased. Such performance decrement was distinct in the morning sessions. Conclusions: These results suggest that fine motor performance decrement during sleep deprivation is predominant in the right hand, which exerts maximal motor function. The finding of decrement in motor function in tapping during sleep deprivation also suggested that the time required for exhaustion of muscles is shortened during sleep deprivation. More deterioration of motor performance was shown in the morning, which could be explained as circadian rhythm effects.

• Childhood Kidney Diseases
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• v.17 no.2
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• pp.42-48
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• 2013

The urinalysis is an essential part of the diagnostic work-up for kidney disease and other renal system disorders. The dipstick test allows rapid and simultaneous chemical analyses of urine, including factors such as pH, specific gravity, protein, glucose, ketones, occult blood, bilirubin, urobilinogen, nitrite, and leukocyte-esterase. The chemical reactions on dipstick are complicated and can be affected by oxidizing, reducing, and discoloring substances in the urine. Therefore, false positive and false negative results are common in dipstick testing. To obtain reliable results with the dipstick, it is necessary to collect urine cleanly and examine the urine carefully. It is mandatory to clearly understand the principles of dipstick testing to evaluate abnormal findings. If the urine dipstick results suggest hematuria, proteinuria, or urinary tract infection, microscopy of the urine should be performed to confirm the findings.

• The Journal of Korean Academy of Sensory Integration
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• v.13 no.1
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• pp.57-66
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• 2015

Objective : The purpose of this study was to investigate the effect of a time management program on self-efficacy and drinking-habit of college student with problematic drinking. Methods : Thirty subjects with problematic drinking were randomly assigned to either a experimental group or control group. The intervention applied to the experimental group was a time manage program which was consisted of two times of sessions per week and provided for five weeks. There was no specific intervention applied to the control group. Alcohol Use Disorder Identification Test-Korean (AUDIT-K) was used to measure problematic drinking behaviors and Self-Efficacy Test was used to evaluate self-efficacy of the subjects. Results : Experimental group showed a significant improvement in AUDIT-K after intervention between groups. In change scores within group, experimental group showed a significant improvement in both AUDIT-K and Self-Efficacy Test, and control group showed a significant improvement in AUDIT-K only. Conclusion : The result of this study showed that time management program is an effective method for college student with problematic drinking.

• Journal of Preventive Medicine and Public Health
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• v.24 no.1 s.33
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• pp.93-97
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• 1991

The time honoured tuning fork at present widely available for examining vibration sensation is brought about the problem of great interobserver variation. To resolve t his problem, author developed a divice using electric magnet that stimulates constantly tuning fork. The perception time of vibration from tunung fork by this device was tested on the index finger of dominant hand of twenty eight subjects. It was 12.44 seconds on average and ranged from 9.47 to 17.25. Coefficient of variation of it was 16.89 percent. Correlation coefficient between test and retest after 30 minutes was 0.957(p<0.01). This device is portable. Test procedure in non-invasive, non-aversive and simple, can be performed within one minute, and does not require the skilled technician. It is felt that this device testing vibration perception time is suitable as screening tool for early detection of occupational peripheral neuropathy.

• Korean Journal of Clinical Laboratory Science
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• v.52 no.4
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• pp.381-388
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• 2020

The quality control of pathological specimens is important for accurate molecular pathology testing. This study evaluated that specimen factors affecting the DNA quality during tissue processing and sample types for BRAF, EGFR, and KRAS mutations tests. One thousand seven hundred and seventy-two molecular pathology tests were investigated for the factors influencing the DNA quality, such as sample type, formalin fixation time, and reexamination status. Cytology samples stored in a saline solution had better DNA quality than commercial cytology preservation. Tissue samples fixed in formalin within 24 hours had better DNA quality than the samples fixed over 24 hours. Between the types of samples, fresh tissue samples and tissue samples with a high tumor cell density had relatively better DNA quality than the formalin-fixed paraffin-embedded (FFPE) tissues and cytology specimens. Of real-time PCR, the non-PNA Ct value increased proportionally with samples held for longer than 24 hours in formalin, and that the formalin-fixed time affects the sample DNA quality. In conclusion, the appropriate tumor cellularity and 10% neutral formalin fixation time are the most important factors for maintaining the DNA quality. These factors should be managed properly for an accurate pathological molecular test to ensure optimal DNA quality.

• Journal of Korean Ophthalmic Optics Society
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• v.19 no.3
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• pp.331-337
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• 2014

Purpose: This is a comparative experimental study on the amount of phoria by the removal time of binocular fusion. In this study, three tests were used for phoria test like Howell test, Thorington test and developed 3D polarizing test. Methods: In this study, it was considered the removal time of binocular fusion for measuring phoria. The three methods were used for measuring quantity of phoria: Howell test, Thorington test and developed 3D Polarizing test. The measurements progressed quickly to avoid eye-strain. So we designed the test charts for marking 3D display modules and the apparatus inserted lenses, like Maddox lens and prism, which are compatible with three phoria tests. The phoria at the moment separation was measured when the binocular fusion was broken through the apparatus and the that at the stable separation was measured when activity of the separated two images like indicated box and figure on horizontal axis stopped. Results: There were statistically significant difference between quantity of phoria at moment separation and that at stable separation. Amount of phoria at moment separation was relatively larger than amount of that at stable separation. In result in exophoria, the quantity of phoria at moment separation was higher than that at stable separation, and in phoria measured by developed 3D polarizing test, it shows the similar results at two condition. Conclusions: For exophoria, the amount of phoria at moment separation of binocular fusion was relatively larger than that at stable separation. The amount of difference between phoria values at moment separation and that at stable separation was alike among three phoria tests. Usually in working, there is no distinction between moment separation and stable separation. But there were definitely the difference between two ways to separate binocular fusion. Therefore, it is need for writing on prescription test name for measuring phoria and condition of separation of binocular fusion.

• Investigative Magnetic Resonance Imaging
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• v.6 no.1
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• pp.5-20
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• 2002

허혈성 심질환 환자의 평가도구로서 MRI의 역할이 확대된 데에는 소위 "one-stop shop"이라는 통합적 심장검사법의 개발이 계기가 되었다. 즉 한 번의 MRI 검사로서 심실벽운동을 평가하여 심근의 기능과 예비능을 측정하여 만성 심근경색을 평가할 수 있고, 심근의 관류를 평가할 수 있고, 관동맥의 혈류 예비능과 심근의 viability를 평가하고, 관동맥 조영술을 통해, 수술 후의 우회로 평가 및 관동맥의 협착 여부의 진단이 가능한 프로토콜이 MRI장비마다 각각 개발되어 보급되고 있다. 하드웨어와 소프트웨어의 개발과 지속적인 연구를 통해서 MRI는 허혈성 심질환의 진단적 검사로서 기존의 다른 검사들과 비교하여 높은 시간적, 공간적 해상력으로 정확한 구조와 기능의 평가를 제공할 수 있는 가장 유용한 검사가 될 것으로 사료된다 특히, MR 관동맥조영술, 심근관류검사, 심근 표지법, dobutamine 부하검사, viability 평가, plaque characterization, MR spectroscopy 분야에서 현재 활발히 연구가 진행되고 있으며 향후 임상적용이 확대될 것으로 예상된다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10b
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• pp.238-240
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• 2001

원자력발전소에서는 기기, 배관 및 각종 지지구조물 등 설비에 대하여 시간의 경과에 따른 취약화 정도를 측정하기 위하여 대략 15개월을 주기로 호기별 비파괴검사로 감시 및 평가하는 가동중검사를 실시한다. 증기발생기, 주복수기와 같은 세관으로 구성된 설비는 와전류탐상검사를 수행하여 신호데이터를 취득하고 건전성 여부를 평가한 다음 그 결과를 Optical Disk에 신호데이터와 함께 저장한다. 본 논문에서는 저장된 방대한 양의 검사 결과 파일을 추출하여 데이터베이스로 구축하고, 행열 수량, 모양, 방향 및 열번호 부여방법이 상이한 다양한 배열 형태의 세관 Map을 편집하여 사용자 요구에 따라 검사정보를 색상 Tube로 Mapping 처리하여 세관의 상태, 검사이력, 결함성장률 및 변화추이 분석을 시각적으로 파악할 수 프로그램 구현 사례를 소개한다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.35 no.3
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• pp.45-51
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• 2012

대기부품은 대기기간 중에 우발적 고장이 발생할 수 있으며(type I failure), 해당상황이 장기간 방치되는 것을 방지하기 위해 주기적인 검사를 하는 것이 일반적이다. 그러나 검사가 대기기간 중 발생한 고장을 확인할 수 있게 하는 반면, 검사를 시작할 때 대기하던 부품에 부하를 가하는 과정에서 고장을 유발할 가능성이 존재하며(type II failure), 검사시간동안 대기부품을 작동시킴으로써 열화에 의한 고장발생(type III failure)의 가능성을 증가시키는 효과도 존재한다. 이에 본 논문은 주기적 검사정책을 갖는 대기부품을 대상으로 세 종류의 고장 가능성을 확률적으로 고려하여 성능분석을 실시하였으며, 성능을 평가하는 척도로 극한가용성을 사용하였다. 특히 type III failure를 고려하는 것은 기존에 연구되지 않은 부분으로 본 논문의 기여점이라 할 수 있겠다. 또한 수치해석을 통해 가용성의 관점에서 전술한 세 가지 유형의 고장특성과 검사주기와의 관계를 파악할 수 있도록 하였으며, 그 결과를 통해 높은 수준의 신뢰성 확보가 목적인 대기시스템의 효율적인 운영을 위한 의사결정시 도움이 될 수 있도록 하였다.