• 대한물리치료과학회지
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• 제29권4호
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• pp.96-111
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• 2022

Background: This study aims to evaluate the effect of core stabilization exercise on the dynamic balance and horizontal rotation of the trunk in young adult men. Through this study, it is expected that various core stabilization exercises will prevent and treat musculoskeletal disease. Design: Randomized Controlled Trial. Methods: The study subjects were recruited from young adult men in their 20s and 30s living in Seoul, and after the randomized controlled trial, it was divided into an experimental group training core stabilization exercise(n=15) and a control group(n=15). The evaluation methods of this study were modified Star Excursion Balance Test(mSEBT), Functional Reach Test(FRT), and Trunk Rotation Test(TRT). The experimental group performed three sets of crunches and deadbug exercises twice a week for eight weeks, and the control group did not perform any exercises similar to core stabilization exercise during the experimental period. Results: The result of the experiment, the experimental group showed significant improvement in mSEBT(p<.05), FRT(p<.05) and TRT(p<.05). Conclusion: In conclusion, core stabilization exercises improved dynamic balance and horizontal rotation of the trunk. As a result of this study, core stabilization exercise can prevent and treat musculoskeletal diseases even in healthy people.

• 한국항공운항학회지
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• 제32권3호
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• pp.164-170
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• 2024

Since then the aviation industry developed dramatically through the two world wars. As these high-performance aircraft were developed, pilots' training has also changed. While initial pilots' training focused on acquiring the navigation and flight skills necessary for pilots to fly an aircraft, nowadays current training focuses on understanding the system, situation awareness and decision making accordingly, and human factor management among the pilots. The result of pilot training that has achieved continuous change and development is the current Evidence-Based Training. This study aims to determine how situation awareness, problem solving and decision making and workload management, which are core elements of Evidence-Based Training, affect pilot's resilience for safe aircraft operation, and to reflect this in the development and composition of Evidence-Based Training programs to contribute to improving the resilience of individual flight crew members.

• The Journal of Korean Physical Therapy
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• 제34권6호
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• pp.292-297
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• 2022

Purpose: This study describes the effects of kicking a ball training on balance and upper limb function in chronic hemiplegia. Methods: Thirty chronic stroke patients were randomly selected; Kicking a ball (n=10), Treadmill gait (n=10), Stepping on the ground group (n=10). The Short Physical Performance Battery (SPPB) for balance and Foot Scan for weight distribution. Upper limb function was measured by the Manal Function Test (MFT). This treatment was performed five times a week for a total of 4 weeks. Results: Kicking group was significantly increased in SPPB (p<0.05) and MFT (p<0.05) between pretest vs post test and pretest vs follow-up. Conclusion: Kicking a ball was effective for improving weight acceptance on the paretic leg, balance and upper limb function. However, In terms of balance, the core stabilization that affected the upper extremity function was not evaluated. Thus, additional research may help determine correlation between core stability and upper limb function to improve balance.

• Nuclear Engineering and Technology
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• 제41권9호
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• pp.1181-1190
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• 2009

Knowing more about the Local Power Density (LPD) at the hottest part of a nuclear reactor core can provide more important information than knowledge of the LPD at any other position. The LPD at the hottest part needs to be estimated accurately in order to prevent the fuel rod from melting in a nuclear reactor. Support Vector Machines (SVMs) have successfully been applied in classification and regression problems. Therefore, in this paper, the power peaking factor, which is defined as the highest LPD to the average power density in a reactor core, was estimated by SVMs which use numerous measured signals of the reactor coolant system. The SVM models were developed by using a training data set and validated by an independent test data set. The SVM models' uncertainty was analyzed by using 100 sampled training data sets and verification data sets. The prediction intervals were very small, which means that the predicted values were very accurate. The predicted values were then applied to the first fuel cycle of the Yonggwang Nuclear Power Plant Unit 3. The root mean squared error was approximately 0.15%, which is accurate enough for use in LPD monitoring and for core protection that uses LPD estimation.

• Nuclear Engineering and Technology
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• 제56권1호
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• pp.283-291
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• 2024

Sodium cooled Fast Reactors (SFR) are built with several engineered safety features and hence a severe accident such as a core melt accident is hypothetical with a probability of <10^-6/ry. However, in case of such accidents, the mixture of the molten fuel and structural materials interacts with sodium. This phenomenon is known as Molten Fuel Coolant Interaction (MFCI) and results in fragmentation of the melt due to various instabilities. The fragmented particles settle as a debris bed on the core catcher at the bottom of the reactor vessel, and continue to generate decay heat. Characteristics of the debris particles play a vital role in heat transfer from the bed and need thorough investigation. The size, shape, and physical state of the debris depend on the associated fragmentation mechanism, superheating of the melt, and sodium temperature. Experiments have been conducted by releasing simulated corium, a molten mixture of alumina and iron generated by the aluminothermy process at ~2400 ℃ into liquid sodium, to study the fragmentation phenomena. After the experiment, the fragmented debris was retrieved and the particle size distribution was determined by sieve analysis. The debris was subjected to microscopic investigation for obtaining morphological characteristics. Based on the characteristics of debris, an attempt has been made to assess of fragmentation mechanism of simulated corium in sodium.

• 한국의류학회지
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• 제40권5호
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• pp.775-787
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• 2016

This study examined the wearing conditions of compression wear for weight training. Compression wear has recently received significant attention from the public and athletes as high-level functional sportswear. The survey was conducted on 373 men in their 20s for general information on purchase behavior, preferred brand, function, and preferred design. The majority of participants (n=181) were aware of the function of compression wear. The most selected reason for wearing compression wear was for its convenience during sports activities. Respondents had the greatest preference for designs with a round neckline, regular leggings type, upper arm-length sleeve, and thigh-length bottom. Respondents also wanted a stronger compression in the core muscle part (abdomen, back, and waist).

• 한국간호교육학회지
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• 제23권1호
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• pp.76-85
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• 2017

Purpose: The aim of this study was to explore the effects of imagery training on outcomes of clinical competence, voluntary practice time and basic nursing skills performance during a core basic nursing skills course. Methods: The design was a pre-post test design with two groups consisting of 88 nursing 3rd-year students. Clinical competence was assessed with a pre-post test, and basic nursing skills' performance and voluntary practice time were assessed at the post-test point. Data were collected from March, 2016 to June, 2016. Results: The pre-post differences of all subcategories of clinical competence were significantly improved in the experimental group (p<.05). but the control group did not show significant differences in the teaching/coordinating and professional development areas (p>.05). The experimental group practiced 1.33 hours more than the control group in voluntary practice. The two groups showed no significant difference in basic nursing skills' performance (p>.05). Conclusion: Imagery training during a core basic nursing skills course showed positive effects on nursing students' clinical competence improvement and increase of voluntary practice time.

• The Korean Journal of Pain
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• 제36권2호
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• pp.242-252
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• 2023

Background: Neck pain is a common problem in the general population and second only to low back pain in musculoskeletal problems. The aim of this study is to compare three different types of exercise training in patients with chronic neck pain. Methods: This study was conducted on 45 patients with neck pain. Patients were divided into 3 groups: Group 1 (conventional treatment), Group 2 (conventional treatment plus deep cervical flexor training), and Group 3 (conventional treatment plus stabilization of the neck and core region). The exercise programs were applied for four weeks, three days a week. The demographic data, pain intensity (verbal numeric pain scale), posture (Reedco's posture scale), cervical range of motion ([ROM] goniometer), and disability (Neck Disability Index [NDI]) were evaluated. Results: In all groups, a significant improvement was found in terms of pain, posture, ROM, and NDI values in all groups (P < 0.001). Between the groups, analyses showed that the pain and posture improved more in Group 3, while the ROM and NDI improved more in Group 2. Conclusions: In addition to conventional treatment, applying core stabilization exercises or deep cervical flexor muscle training to patients with neck pain may be more effective in reducing pain and disability and increasing ROM than conventional treatment alone.

• 한국응용과학기술학회지
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• 제36권4호
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• pp.1349-1357
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• 2019

이 연구의 목적은 코어 저항 운동이 농업 여성노인들의 근감소증 지표에 미치는 영향을 보고자 하였다. 이 연구에 참여한 피검자는 65세 이상의 천안시 거주 농업 여성노인 15명과 통제군 여성 15명으로 하였다. 코어 운동군은 주 2회 60분간 코어 강화 운동을 실시하였고, 종속변인인 근감소증 지표로는 악력, 의자 앉았다 일어서기, 근육의 면적과 단기운동수행력으로 4m 보행, 2.44m 걷기 및 400m 걷기를 실시하였다. 코어 저항 운동 결과 의자 앉았다 일어서기의 유의한 개선을 보였으나 근단면적에서는 집단 간에 유의한 차이를 보였다. 또한 단기운동수행 능력 중 4m 보행속도에서 유의한 상호 작용과 2.44m 왕복걷기와 400m 걷기에서는 유의한 개선을 보이는 것으로 나타났다. 이상과 같이 코어 저항 운동은 근육의 활성화로 인해 하체근육 및 단기 운동수행능력을 개선을 가져오는 것으로 판명되었다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제35권9호
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• pp.562-571
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• 2008

본 논문에서는 분야 온톨로지 구축을 위하여 분야 상위 온톨로지를 구축한 다음, 분야 시소러스의 개념과 관계를 이용하여 분야 상위 온톨로지를 확장하는 방법을 제안한다. 이를 위하여 우선 일반분야 시소러스와 분야 사전을 이용하여 분야 상위 개념 분류체계를 구축한다. 다음, 분야 시소러스의 개념을 분야 상위 온톨로지의 상위 개념으로 분류하고, 광의어(Broader Term: BT)-협의어(Narrower Term: NT) 및 광의어-관련어(Related Term: RT) 사이의 관계를 분야 상위 온톨로지에서 정의한 의미관계로 분류한다. 개념 분류는 두 단계로 진행되는데, 1단계에서는 빈도수 기반 방법, 2단계에서는 유사도 기반방법을 적용하여 시소러스 개념을 분야 상위 온톨로지의 개념으로 분류한다. 관계 분류에서는 두 가지 방법을 적용하였는데, (i) 훈련데이타가 부족한 경우를 위하여 규칙기반 방법으로 BT-NT/RT관계를 iso와 기타 관계(non-isa관계)로 분류하고, 다시 패턴기반 방법으로 non-isa관계를 온톨로지를 위한 의미관계로 분류한다. (ii) 훈련데이타를 충분히 가지고 있을 경우, 최대 엔트로피 모델(MEM)을 적용한 특징기반 분류 기법을 사용하되, k-Nearest Neighbors(k-NN)방법으로 훈련데이타를 정제하였다. 본 논문에서 제안한 방법으로 시스템을 구축하였고, 실험 결과 사람에 의한 판단 결과와 비교 가능한 성능을 보여 주었다.