• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제28권6호
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• pp.464-471
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• 2002

The purpose of this study was to evaluate the stress patterns within fractured mandibles generated by reduction forceps and to determine the optimal position of the reduction forcep. Twenty-seven mandibular models were fabricated using a photoelastic resin. Each of the three sets of mandible models prepared was osteotomized according to one of three different fracture types(symphysis, parasymphysis and body fractures). After reducing the cut segments, a reduction forcep was placed into different engagement holes to compress the segments. Photoelastic stress analysis was used to visualize the stress patterns within the fractured mandiblular models generated by the reduction forcep. In the case of symphysis or parasymphysis fractures, an optimum distribution of stress over the fracture site was achieved when placing the reduction forcep more than 12.5mm on either side of the fracture line between the midway level bisecting the mandible and 5mm below the level. In the case of body fractures, optimum stress distribution was achieved when the reduction forcep was placed more than 15mm from the fracture line on the midway level. In conclusion, a correct use of reduction forceps helps to provide a precise threedimensional reduction for mandibular fractures.

• 한국보육지원학회지
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• 제11권5호
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• pp.1-18
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• 2015

본 연구는 유아를 대상으로 한 스트레스 감소 프로그램의 효과를 고찰하기 위한 것으로 국내에서 발간된 학위논문 및 한국연구재단 등재학술지를 토대로 체계적 문헌고찰 및 메타분석의 연구방법을 실시하였다. 문헌고찰을 위한 데이터베이스는 RISS, KISS, DBpia의 세 종류를 활용하였으며, '유아 스트레스'로 검색을 시행하였다. 최초 검색된 논문은 석 박사학위논문 1,121편, 등재(후보)학술지 논문 1,201편, 총 2,322편이었다. 체계적 문헌고찰을 위한 검색 전략으로 최종 선정된 논문은 26편이었고, 그 중 19편의 논문이 메타분석에 사용되었다. 연구결과, 첫째, 본 연구의 대상문헌들은 대부분 2010년 전후로 발표되었으며, 주로 만 5세 유아들을 대상으로 한 신체활동 관련 프로그램이 가장 많았다. 둘째, 본 연구의 대상문헌들은 전체적으로 -1표준편차 이상의 스트레스가 감소되는 효과를 보였으며, 특히 의뢰된 유아를 대상으로 한 집중적 심리치료 프로그램의 효과가 가장 높았다. 이러한 결과를 기초로 유아 스트레스 감소 프로그램에 대한 제한점 및 교육적 시사점을 논의하였다.

• 동의신경정신과학회지
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• 제18권3호
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• pp.157-164
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• 2007

The SRP program(stress reduction program) is reported has a good effect to patient to escape from anxiety. To reduce several symptoms due to anxiety, we performed some SRP programs to our patient who had suffered anxiety disorder. The measurement tools of patient's improvement we used are Heart Rate Variability and State-Trait Anxiety Inventory. Through this programs, symptoms and feeling of anxiety were decreased than first time and Autonomic nerve system balance was much improved. this is caused by effort of self-control meditation, mindfullness, breathing instruction and muscle relaxation program.

• 터널과지하공간
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• 제9권3호
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• pp.194-203
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• 1999

본 연구에서는 록볼트의 역학적 거동을 파악하기 위하여 지하공동에 설치된 단일 록볼트에 발생하는 축응력 분포, 록볼트-그라우트 접촉면에서의 전단응력 분포와 중립점의 위치를 분석하였으며, 현장의 다양한 지질조건에 대한 록볼트의 보강효과를 분석하기 위하여 여러가지 지반조건과터널크기에서 록볼트의 설치간격과설치길이를 변화시키며 전산해석을 수행하였다. 전산해석결과, 최대 인장응력 및 전단응력의 분포를 파악할 수 있었으며, 중립점의 위치에 영향을 주는 인자가 공동의 굴착폭임을 알 수 있었다. 또한 패턴볼팅으로 보강된 원형공동에서 록볼트에 의한 암반의 봉압효과는 응력 증가비를 사용하여 분석하였으며, 소성대 감소효과와지반 변위 감소효과는 각각 소성대 감소비와 변위 감소비를 사용하여 분석하여 록볼트의 보강효과 경향을 파악할 수 있었다. 이러한 보강효과의 경향분석 결과는 실제 터널의 안정적 설계에 적용할 수 있을 것으로 판단된다.

• 대한치과마취과학회지
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• 제8권1호
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• pp.1-9
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• 2008

Common dental procedures (local anesthesia and dental treatment) are potentially stress-inducing in many patients, especially medically compromised patients. The body response to dental stress involves the cardiovascular system (an increase in cardiovascular workload), the respiratory organ and the endocrine system (change in metabolism). To minimize the stress to the medical risk patient, the stress reduction protocol was established. The obtained contents were as follows: (1) Recognize the patient's degree of medical risk (2) Complete medical consultation before dental therapy (3) Schedule the patient's appointment in the morning (4) Monitor and record preoperative, perioperative and postoperative vital signs (5) Use psychosedation during therapy (6) Use adequate pain control during therapy (7) Short length of appointment: do not exceed the patient's limits of tolerance (8) Follow up with postoperative pain/anxiety control (9) Telephone the higher medical risk patient later on the same day that treatment was given. This protocol is predicated on the belief that the prevention of or reduction of stress ought to begin before the start of an appointment, continue throughout treatment, and, if indicated, into the postoperative period. The authors used the stress reduction protocol in the care of local anesthesia infected teeth in medically compromised patients. The final prognosis was comfortable without any complications.

• 한국초지조사료학회지
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• 제39권3호
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• pp.153-157
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• 2019

Salicylic acid (SA) is an essential plant growth regulator that functions as a signaling molecule in plants. The purpose of this study was to clarify how the exogenous application of SA counteracts aluminum stress-induced growth and biomass yield reduction in alfalfa exposed to aluminum (Al) stress. Two-week-old alfalfa seedlings were exposed to a combination of $AlCl_3$ ($0{\mu}M$, $50{\mu}M$ and $100{\mu}M$, respectively) and SA (0.1 mM) for 72 hours. We observed, Al stress-induced plant growth inhibition and forage yield reduction are Al stress-dependent manner. A significant reduction of plant height (42.0-52.9%), leaf relative water content (13.0-21.4%), root length (35.4-48.7%), shoot fresh weight (31.2-25.9%), root fresh weight (15.4-23.3%), shoot dry weight (12.7-22.2%), roots dry weight (47.3-53.5%), were observed in alfalfa. In contrast, SA alleviated the Al-stress and enhanced growth and biomass yield in alfalfa. This study provides useful information concerning the role of SA that counteracts aluminum stress-induced growth and yield reduction in alfalfa.

• 항공우주시스템공학회지
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• 제9권4호
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• pp.31-36
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• 2015

The fatigue analysis for cutout panel used for the weight reduction of aircraft has been conventionally performed through the open hole concept using the reference stress and stress concentration factor (Kt). However, in the actual structure cases, the goal of weight reduction might be less meaningful due to the conservative approach induced by the difficulties of extracting the confident reference stress from FE-Analysis in the complicated loading behavior. Therefore a new approach is proposed in order to secure the effectiveness of weight reduction and validate the confidence of the analysis results using the interaction of max-min principal stress at the critical location of open hole edge line.

• 기본간호학회지
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• 제7권1호
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• pp.109-121
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• 2000

Increasingly nursing science is embracing the concepts and methodology derived from psycho-neuroimmunology. It has been previously shown that stress increases and immune function declines in students undergoing examinations. To date, however, no many studies have been reported on stress levels, immune function and interventions in Korean students undergoing their first clinical nursing rotation. It was proposed that nursing students during their first clinical rotation experience increase in stress because of the novelty of the situation and their lack of clinical knowledge. It was also hypothesized that biofeedback and progressive relaxation, methods of self-regulation of involuntary autonomic nervous system responses, would reduce the stress response. The purpose of this study is to test the effectiveness of progressive muscle laxation using biofeedback The effectiveness of the experimental methods was tested by measuring the degree of symptoms of stress (SOS) and the values of ephinephrine, pulse rate, blood pressure and natural killer cells. The subjects of this study were thirty nursing students divided into two groups: experimental group was progressive muscle relaxation group using biofeedback and control group. This study was conducted for 8 weeks of clinical practice. Biofeedback training was done by software developed by J&J company (1-410 form for progressive muscle training). Progressive muscle relaxation training according to Jacobson's Theory was done by messaged word from biofeedback. The data was analyzed using Chronbach' ${\alpha}$ and t-test of the SPSS program and the significance level of statistics was 5%. The results of the study were : 1) The progressive muscle relaxation training using biofeedback was effective for the reduction of symptoms of stress(t=-4.248, p<.001) under clinical practice stress conditions. 2) The progressive muscle relaxation training using biofeedback was not effective for the values of epinephrine(t=-1.294, p=.206). 3) The progressive muscle relaxation training using biofeedback was effective for the reduction of systolic blood pressure (t=-2.757, p=.01). 4) The progressive muscle relaxation training using biofeedback was effective for the reduction of diastolic blood pressure (p=-2.032, 0=.05). 5) The progressive muscle relaxation training using biofeedback was not effective for the reduction of pulse rate(t=-15, p=.988). 6) The progressive muscle relaxation training using biofeedback was effective for the maintenance of natural killer cells (t=2.381, p=02). The first clinical rotation for student nurses is a stressful experience as seen by the rise in the SOS in the control group. Biofeedback using progressive muscle relaxation were effective in preventing the rise of symptoms of stress and the blood pressure means when comparing the pre to post clinical experience, The mean natural killer cell count was depressed in the control group but not significantly different in the experimental groups, It is proposed here that stress via the hypothalamic - pituitary - adrenal axis suppressed the NK cell count whereas the relaxation methods prevented the rise in stress and the resulting immune depression. We recommend relaxation techniques using biofeedback as a health promotion technique to reduce psychological stress. In summary. the progressive muscle relaxation training using biofeedback was effective for the reduction of symptoms of stress under clinical practice stress conditions.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2003년도 추계학술발표대회 개요집
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• pp.207-209
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• 2003

In FE analysis for residual stress of a casting, contact force between mould and casting material and gravity force must be considered for exact simulation. Preheating of a repair weldment had a little effects on the reduction of residual stress. However, preheating with hammer peening had a great deal of effects on the reduction of residual stress. A method for estimation of fatigue life for a repair weldment has been established.

• 한국진공학회지
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• 제1권1호
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• pp.176-182
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• 1992

CVD 텅스텐의 응력 및 접합 누설전류 특성을 조사하였다. 응력-연속 어닐링온도 의 그래프는 냉각곡선의 응력이 가열곡선의 그것보다 더 높게 나타나는 이력현상을 보인다. SiH4 환원에 의하여 증착된 텅스텐 막이 수소환원에 의하여 증착된 막보다 전반적으로 내부 응력 뿐만 아니라 열 응력도 더 큰 것으로 나타났으며 전자가 후자에 비해 실리콘 기판과의 부착특성이 불량한 것도 이러한 응력차와 유관한 것으로 생각된다. SiH4 환원에 의하여 형 성된 텅스텐 막은 상온에서 인장 응력 상태에 있으며, 온도가 증가됨에 따라 응력이 감소하 다가 $700^{\circ}C$ 부근에서 압축 응력 상태로 바뀌고, 계속 더 온도가 증가됨에 따라 압축 응력 이 급격히 증가한다. SiH4 환원에 의한 텅스텐 막의 증착 온도가 증가함에 따라 n+/p 접합 의 누설전류가 크게 증가하며, 특히 $400^{\circ}C$로 온도가 증가함에 따라 누설전류의 증가폭이 크게 나타났는데, 이것은 수소환원 반응시와 유사하게 텅스텐의 침투(encroachment)에 의 한 실리콘 소모가 그 원인이다. SiH4/WF6 유속비의 증가에 따라서도 누설전류가 증가하는 데 그 효과는 미소한 것으로 나타났다.