• 한국지반공학회논문집
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• 제37권11호
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• pp.71-81
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• 2021

본 연구는 액상화 현상을 모사할 수 있는 1g 진동대 실험(Shaking table test)을 이용하여 포화 사질토 지반 위 제방 존재 유무에 따른 지반 조건 대상으로 재액상화 거동에 대하여 연구하였다. 실험에 사용된 지반은 실리카 모래를 사용하였으며, 지반조성은 액상화층 50cm(Case 1)와 비액상화층 17.5cm와 액상화층 32.5cm인 경우(Case 2)로 2가지 조건으로 수중낙사법을 이용하여 조성하였다. 제방은 높이 10cm, 사면 기울기는 1 : 1.8 비율로 고정하여 조성하였다. 지진파는 5Hz의 정현파를 8초간 가진을 진행하여 총 1차부터 5차 가진을 수행하였다. Case 1의 경우 자유장 위치에서 1차 가진 시 모든 깊이에 액상화가 발생하였으며, 3차 가진 시 5cm 깊이를 제외한 모든 깊이에서 액상화 현상이 발생하지 않음을 확인하였다. 제방 중심 위치에서는 1차 가진 시 20cm 깊이까지 액상화가 발생하였으며, 2차 가진 시 5cm 깊이를 제외한 모든 깊이에서 액상화 현상이 발생하지 않음을 확인하여, 제방 구조물 설치 시 재액상화 거동에 대하여 평가하였다.

• 수면정신생리
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• 제16권2호
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• pp.79-84
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• 2009

목 적: 바이오피드백은 정신생리연구에서 중요한 위치에 있으며 정신생리장애 치료에도 유용하다. 만성통증은 매우 흔히 관찰되는 대표적 정신생리장애이다. 이 연구에서는 바이오피드백 기기를 이용한 스트레스 반응 검사로 만성통증 환자와 정상인 간에 생리신호의 특성을 비교하였다. 방 법: 만성통증 환자 42명(남자 17명, 여자 25명, 44.67${\pm}11.10$세)에게 치료 첫째 시간에 바이오피드백 기기를 이용하여 스트레스 반응검사를 하였다. 그 결과를 정상인 42명(남자 17명, 여자 25명, 45.17${\pm}10.46$세)과 비교하였다. 스트레스 반응검사에서는 기저, 스트레스, 그리고 회복 상태에서 각각 전두근 근전도(frontalis electromyography), 피부전도(skin conductance), 피부체온(skin temperature)을 각각 2분씩 측정하여 평균값을 산출하였다. 측정값들의 양 군간 비교에는 독립 t-검정(independent t-test), 각 상태에 따른 측정값의 변화는 대응표본 t-검정(paired-test)로 분석하였다(양측검정, p<0.05). 결 과: 만성 통증 환자는 정상인에 비해 기저, 스트레스, 그리고 회복 상태 모두에서 전두근이 더 긴장해 있었다 (기저: $8.10{\pm}10.465.97{\mu}V$ vs $4.72{\pm}1.52{\mu}V$, t=-3.56, p<0.01; 스트레스: $11.25{\pm}6.89{\mu}V$ vs $8.49{\pm}4.78{\mu}V$, t=-2.13, p<0.05; 회복: $7.12{\pm}3.77{\mu}V$ vs $4.78{\pm}1.59{\mu}V$, t= -3.70, p<0.01). 또한 만성 통증 환자는 세 상태 모두에서 피부전도가 더 잘 되었다(기저: $1.06{\pm}1.0{\mu}S$ vs $0.42{\pm}0.29{\mu}S$, t=-4.0. p<0.01; 스트레스: $1.87{\pm}2.05{\mu}S$ vs $1.03{\pm}0.86{\mu}S$, t=-2.47, p<0.05; 회복: $1.74{\pm}1.77{\mu}S$ vs $0.64{\pm}0.59{\mu}S$, t=-3.8, p<0.01). 그러나 피부체온은 기저, 스트레스, 그리고 회복 상태 모두에서 두 군 사이에 유의한 차이가 없었다(p<0.05). 결 론: 만성 통증 환자는 정상인에 비해 전두근 근전도와 피부전도 측정값이 전반적으로 증가된 소견을 보였다. 이는 통증으로 인하여 교감신경계가 정상인에 비해 자극에 더 예민한 상태에 있음을 시사한다.

• 대한정형도수물리치료학회지
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• 제1권1호
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• pp.37-48
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• 1995

The correlation between mobility abnormalities and positional findings(pelvic asymmetry) is essential for complete pelvic girdle evaluation. For mobility tests, there are four tests include : 1. Standing forward bending test. 2. Seated forward bending test. 3. Posterior anterior sacral pressures. 4. Kinetic test. To determine specific pelvic dysfunction, positional findings should bo assessed with bony landmarks. According to the assessment findings, the suggested order of treatment is as follows. 1. Pubic malalignment. 2. Sacroiliac dysfunction. 3. Iliosacral dysfunction. Many of the pelvic dysfunctions will respond to the simplified approach as shown in this paper but some dysfunctions will require more specific treatment.

• 한국농공학회논문집
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• 제55권2호
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• pp.65-75
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• 2013

In this study, the engineering characteristics of volcanic ash-cement soil mixtures and zeolite-cement soil mixtures are investigated by using unconfined compression test, freezing-thawing test, SEM and XRD analysis. The samples were mixed with volcanic ash from Mt. Baekdusan or porous zeolite, and cement as the ratios of 3.5:1, 4.0:1, 4.5:1, 5.0:1 with and without metakaolin. It is confirmed that compressive strength degraded with increasing of the amount of volcanic ash or zeolite, and increased with addition of metakaolin as a binder. Moreover, test results suggested that the mixtures provided sufficient freezing-thawing resistance. In addition, ettringite as a product of cement hydration was detected by SEM and XRD, and that possibly contributes to the strength of the mixtures.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2017년도 춘계학술대회 논문집
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• pp.151.1-151.1
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• 2017

This work studied the corrosion behavior of AZ31 Mg alloy galvanically coupled with Cu during immersion in 0.1 and 0.5 M NaCl solutions by in-situ observation and galvanic corrosion current measurement using a zero resistance ammeter. The corrosion behavior of AZ31 Mg alloy was also studied by salt spray test. The average galvanic corrosion density during 2 h immersion in 0.1 NaCl solution was found to decrease as an exponential function with increasing the surface area ratios between AZ31:Cu or with increasing the distance between AZ31 and Cu. The corrosion of electrodeposited Cu on AZ31 Mg alloy was concentrated at the area next to Cu (about 5 mm for immersion test and 2 mm for salt spray test) and pitting corrosion was accelerated at the area beyond the severely corroded area by the galvanic coupling effect.

• 대한가정학회지
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• 제24권3호
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• pp.11-18
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• 1986

The height of pillow was investigated from the ergonomics standpoint. The main concern of this research was to investigated the appropriate height of the pillow in lying on one's side. The infestigation in this study was administered to a sample of forty men who were similar to Korean standard body-build. The experiment was conducted under the awakening state. The experimental method was performed using ; 1) Sensuous test 2)Electromyogram survey 3) X-ray observation Sensuous test was performed using both a plain wood board and a slope wood board by jack to objectify. RESULTS : 1) By sensuous test, the height of pillow for the most comfortable state turned up 9.4±1.1cm in lying on one's side. 2) By electromyogram survey and X-ray observation, the numerical value was substantially confirmed well-grounded physiologically and anatomically. Ihope this research will be useful to establishing the suitable height of pillow for Korean.

• 한국지반공학회지:지반
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• 제2권1호
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• pp.7-14
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• 1986

The structure of the collapsible soils, such as decomposed granite soil and loess, were examined by the odeometer test, SEM & XES analysis and static & cyclic triaxial test, and hove this structure have influences upon the collapsible behaviour under static and cyclic load was investigated. The study results obtained are as follows; 1. The macropores space of decomposed granite soil (rd=1.50g/cm3) and loess (rd=1.43g/cm3) used in this test were well developed, and showed the behaviour of collapsible soil. 2. Collapsible soil has high resistance on the strain under natural moisture content, however, the resistance on the strain was sharply decreased by the absorption and increasing load since its special structure was destructed. 3. Under the static load, the strain of collapsible soil was high by the viscous flow of the cyclic bonds with time lapse, but Infer the cyclic load, the strain of collapsible soil was low since the tinge needed to destruct the bonding force of clay was not enough. 4. The understanding about the cyclic behaviour of collapsible soil may be helpful to predict the elastic & residual strain of the foundations by the earthquake together with the damage by the additional failure.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.371.1-371.1
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• 2002

Triterpenoids. Ursolic acid (1). 23-hydroxyursolic acid (2). and tormentic acid (3) were obtained by the hydrolysis of BuOH fraction of Cussonia bancoensis extract and further chromatographic isolation to test antinociceptive and anti-inflammatory effect of C. bancoensis (Aratiaceae). Compound 1 and 2 exhibited anti-nociceptive effects, which were determined by acetic acid-induced writhing test and hot plate test. However. the effect of tormentic acid was not significant (omitted)

• 한국초전도ㆍ저온공학회논문지
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• 제11권2호
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• pp.33-36
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• 2009

A 1 MW class HTS (High-Temperature Superconducting) synchronous motor has been developed. This motor is aimed to be utilized for industrial application such as large motors operating in large plants. The HTS field coil of the developed motor is cooled by way of neon thermo siphonmechanism and the stator (armature) coil is cooled by water through hollow copper conductor. This paper also describes evaluation of some electrical parameters from performance test results of our motor, which was conducted at steady state in generator mode and motor mode. Open and short circuit tests were conducted in generator mode while a 1.1 MW rated induction machine was rotating the HTS machine. Electrical parameters such as mutual inductance and synchronous inductance are deduced from these tests. Load test was done upto rating torque during motor mode and efficiency was measured at each load torque.

• 대한물리의학회지
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• 제13권2호
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• pp.1-9
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• 2018

PURPOSE: This study investigated the relationship between the daily physical activity level and fall-proof-related fitness in older female adults. METHODS: This study promoted and sampled the subjects who participated in the study for 2 weeks, and developed a basic information questionnaire to select the subjects to be excluded from the research. The amount of energy expenditure through daily physical activity was examined, and the elderly physical fitness, and balance test were analyzed. The subjects were divided into group A (${\geq}1,500kcal/week$), group B (<$1,500-{\geq}1,000kcal/week$), and group C (<1,000 kcal/week) according to their daily physical activity level. RESULTS: A significant difference in the daily physical activity level (energy expenditure), Chair Stand Test (lower body strength), 8-Foot Up-and Go Test (dynamic balance), and CTSIB-M (modified Clinical Test of Sensory Interaction in Balance) was observed among groups A, B, and C (p<.5), but there was no significant difference in the Chair Sit-and-Reach Test (lower body flexibility) (p>.5). CONCLUSION: The increase in physical activity is an essential factor for preventing falls and it provides many health benefits for the elderly. On the other hand, considering that elderly people cannot access exercise programs easily in Korea, it can be predicted that increasing elderly people's physical activity in daily life rather than specific exercises may help prevent falls.