• 대한물리의학회지
• /
• 제1권1호
• /
• pp.59-66
• /
• 2006

Purpose : The purpose of this study was to investigate the effects of diaphragmatic breathing on activation of lumbar paraspinal muscles of normal healthy people. Diaphragmatic breathing may affect activation of trunk muscles. The assumptions are as follows: the crural diaphragm attatches to the lumbar vertebrae from L1 to L3, the voluntary downward pressurization of the diaphragm increases intra-abdominal pressure, and this increases the stiffness of the spine. Methods : Sixty male college students ranging 19 to 34 years were screened and % maximal voluntary contraction(% MVC) of trunk muscles on the four positions of back extension exercise was compared during the pre and post of inspiration of diaphragmatic breathing. Results : 1. % MVC of right and left erector spinae had the statistically significant difference between pre and post inspiration of diaphragmatic breathing in the dynamic right arm and left leg extension position(p<0.05). 2. % MVC of right and left erector spinae had the statistically significant difference between pre and post inspiration of diaphragmatic breathing in the dynamic left arm and right leg extension position(p<0.05). 3. % MVC of right and left erector spinae had the statistically significant difference between pre and post inspiration of diaphragmatic breathing in the static lying prone extension position(p<0.05). 4. % MVC of right and left erector spinae had the statistically significant difference between pre and post inspiration of diaphragmatic breathing in the static lying on prone position(p<0.05). Conclusion : This study will be used as the purpose of data collection of lumbar paraspinal muscles on diaphragmatic breathing and be introduced as the new therapeutic intervention for management of patients with back pain.

• 디지털산업정보학회논문지
• /
• 제6권1호
• /
• pp.1-12
• /
• 2010

Recently, large amount of information in IDS(Intrusion Detection System) can be un manageable and also be mixed with false prediction error. In this paper, we propose a data mining methodology for IDS, which contains uncertainty based on training process and post-processing analysis additionally. Our system is trained to classify the existing attack for misuse detection, to detect the new attack pattern for anomaly detection, and to define border patter between attack and normal pattern. In experimental results show that our approach improve the performance against existing attacks and new attacks,from 0.62 to 0.84 about 35%.

• 한국재난정보학회 논문집
• /
• 제2권1호
• /
• pp.113-127
• /
• 2006

The suggestions that follow are about the Qualitative Improvement of private security Industrial. First, in legal and institutional policy, new establishment by law for private security and more support from government is asked. Moreover, the restructuring or M&A between petty companies and the pricing for security service should be performed. Second, in the structural aspect of private security industry, the professional education center for private security guards should be established and the terms of payment and welfare should be improved to the level above standard. In addition, it should be achieved to change the public to have a new and correct understanding of private security and develope the specialized parts suited to the characteristic and ability of each companies. Third, the construction of operating system for private security service should be achieved; recruit system for competent security guards, marketing strategy and enforcement system, widely known confidence to client, normal training system for security guards and post management system for client. This is also to be suited to the characteristic of each companies.

• 디지털산업정보학회논문지
• /
• 제6권2호
• /
• pp.199-207
• /
• 2010

Recently, large amount of information in IDS(Intrusion Detection System) can be un manageable and also be mixed with false prediction error. In this paper, we propose a data mining methodology for IDS, which contains uncertainty based on training process and post-processing analysis additionally. Our system is trained to classify the existing attack for misuse detection, to detect the new attack pattern for anomaly detection, and to define border patter between attack and normal pattern. In experimental results show that our approach improve the performance against existing attacks and new attacks, from 0.62 to 0.84 about 35%.

• Steel and Composite Structures
• /
• 제39권5호
• /
• pp.529-542
• /
• 2021

Shear connectors are required to build composite (concrete and steel) beams. They are placed at the interface of concrete and steel to transfer shear and normal forces between two structural components. Such composite beams are sensitive to provide structural integrity when exposed to fire as they loss strength, stiffness, and ductility at elevated temperature. The present study is designed to investigate the shear resistance and the failure modes of the headed stud shear connectors at fire exposure and post-fire exposure. The study includes ordinary concrete and concrete with carbon nanotubes (CNTs) to build composite (concrete-steel) beams with structural steel. Experimental push tests were conducted on composite beams at ambient and elevated temperatures, such as 200, 400 & 600℃. Moreover, push tests were performed on the composite beams after being exposed to 200, 400 & 600℃. Push test results illustrated the reduction of ultimate shear capacity and stiffness of headed stud shear connectors as the temperature increased. Although similar values of ultimate shear were obtained for the headed stud connectors in both ordinary and CNT concrete, the CNT modified concrete reduced the concrete spalling and cracking compared to ordinary concrete and was observed to be effective at temperatures greater than 400℃. All specimens showed a lower shear resistance at fire exposures compared to the corresponding post-fire exposures. Moreover, numerical simulation by Finite Element (FE) analyses were carried out at ambient temperature and at fire conditions. The FE analysis results show a good agreement with the experimental results. In the experimental studies, failure of all specimens occurred due to shear failure of headed stud, which was later validated by FE analyses using ABAQUS.

• 한국한의학연구원논문집
• /
• 제16권2호
• /
• pp.143-157
• /
• 2010

Objectives : The objective of this study was to access the effect of Artemisiae capillaris herba Extracts on the organogenetic reproductive toxicity of New Zealand White rabbits when administered by oral gavage. Methods : Gestational New Zealand White rabbits were dosed from 6 days of gestation to 18 days of gestation. It was conducted in accordance with the recommendations of the KFDA Guideline for Detection of Toxicity to Reproduction for Medicinal Products. In addition, serum AST, ALT, LDH and ALP levels were detected with their necropsy and histopathological observation Results: No significant changes of body weights, gains and food consumption were demonstrated in all dosed groups compared to those of vehicle control group except for 2,000mg/kg-dosing group, which showed significantly increase of body weight compared to that of vehicle control group. Normal gross findings were demonstrated in all tested groups. No significant changes of number of corpora lutea, implantation, implantation rate, number of fetal death, loss rate of post-implantation, number of live youngs at C-section, survival rate of post-implantation, number of male live youngs at C-section, number of female live youngs, sex ratio of live young, external anomalies of live youngs and body weight of live youngs were demonstrated in all dosed groups compared to those of vehicle control group. Although some visceral variations such as thymic reminant in the neck, dilation of renal pelvis, dilated ureter and malpositioned left common carotid artery, no significant changes were demonstrated in all dosed groups compared to that of vehicle control group. Some malformations and variation were demonstrated with retardations. However, no significant changes were demonstrated in all dosed groups compared to that of vehicle control group. In addition, similar ossification numbers were detected in sternebrae, metacarpals, metatarsals, phalanges, cervical vertebrae, and sacral and caudal vertebrae. No Artemisiae capillaris herba Extracts treatment-related changes of serum AST, ALT, LDH and ALP levels were demonstrated in all dosed levels in this study. Conclusions : We could conclude that oral administration of Artemisiae capillaris herba Extracts hasn't an influence on the organogenetic reproductive toxicity.

• 한국작물학회:학술대회논문집
• /
• 한국작물학회 2017년도 9th Asian Crop Science Association conference
• /
• pp.39-39
• /
• 2017

In Asia, sweet potato (Ipomoea batatas) is a very important crop for starch production. Approximately 74.3% of the total sweet potato production quantity is produced in Asia (FAO, 2014) and China is the largest producer of sweet potato. Post-harvest management is particularly important because it is difficult to maintain the quality as well as quantity of sweet potatoes. Despite the importance of post-harvest management, researches on sweet potato have been focused on production-related study such as breeding of new variety, improved techniques of cultivation, so there is limited research on storage after harvest. Curing is a normal practice after sweet potato harvest to promote wound healing and extend postharvest storage life. In Korea, harvested sweet potatoes are usually cured for 4 to 7 days at $30-33^{\circ}C$ and 80-95% relative humidity within one week. Since the optimum storage temperature of sweet potato is regarded as $15-20^{\circ}C$, additional facilities and costs are required to raise the temperature for curing. However, the majority of small farmers do not have the capacity to provide additional facilities and costs. This study was initiated to suggest a new curing method to accelerate the wound healing by applying chemical oxidation to the wound surface of sweet potato. Oxidative stress is known to play an important role in the synthesis of secondary metabolites including lignin. In addition, chemical oxidation can be applied to prevent spoilage caused by microorganisms. Powerful gaseous oxidant with excellent penetration ability and superior sterilization effect was selected for this study. Lignification, weight loss, and spoilage rate of artificially wounded sweet potatoes were investigated after oxidant fumigation. There were clear differences in morphological analysis such as lignification pattern, lignin deposition color, and continuity of lignified cell layers between oxidant-fumigated sweet potatoes and control. These results show that gaseous oxidant can be used to supplement or replace the curing practice, to improve shelf-life as well as curing cost reduction.

• 디지털융복합연구
• /
• 제19권2호
• /
• pp.509-514
• /
• 2021

코로나바이러스감염증-19(COVID-19)의 유행은 의료 현장에서의 비대면 진단, 관찰, 처치에 대한 요구를 더욱 가속화 시켰고, 이는 의료 로봇에 대한 관심증대로 이어지고 있다. 저자들은 국가 기관 보도 자료, 온-오프라인 언론 보도 기사, 국내·외 로봇 기업 보도 자료들의 분석을 통해 포스트코로나 시대의 방역 의료 로봇이 활용되어야 할 방향에 대해 전망하고자 한다. COVID-19의 유행은 의료 로봇에 대한 관심을 높이게 하였고, 소독, 물류 이송뿐 아니라 감염병이 의심되는 상황에서의 선별 검사, 환자에 대한 감시, 격리 환자에 대한 원격 진료 지원, 가족과의 화상 통화 등의 업무를 수행할 수 있는 의료 로봇의 적용 등이 필요하게 되었다. 따라서 로봇의 상용화에 따른 다양한 문제점들에 대해 충분한 고찰을 기반으로 향후 의료 로봇의 올바른 개발과 적용 및 이를 검증하는 실증적 연구들이 지속되어야 할 것으로 보인다.

• 예술경영연구
• /
• 제58호
• /
• pp.153-177
• /
• 2021

본 연구는 코로나19로 촉발된 뉴노멀 시대의 예술정책에 관한 이론과 국내외 정책 동향을 바탕으로 언어네트워크 분석을 시도하였다. 이를 위해 2020년 3월부터 9월까지의 '코로나'와 '예술'의 키워드가 들어간 자료를 구글(Google)뉴스와 웹(web)문서에서 수집하여 227개의 정제된 주제어를 추출하였고, 추출된 주제어를 넷마이너 프로그램을 통해 주제어 빈도분석과 중심성을 지표로 분석하였다. 또한 각 주제어 간의 관계 분석을 위해 언어네트워크의 시각화 분석을 시도하였다. 분석결과 가장 많은 빈도수를 드러낸 주제어는 '코로나'였고, '문화예술', '예술', '공연', '온라인', '지원'이 최다 빈도수를 기록한 그룹에 포함되었다. 중심성 분석에서는 '코로나'가 가장 빈도가 높았고, '시대', '이후', '포스트', '예술', '문화예술' 순으로 나타나 빈도수가 높은 '코로나'와 '예술', '문화예술'은 대부분의 중심성에서도 우위를 차지했다. 특히, 주제어 빈도수와 중심성 분석에서 공통으로 상위를 차지하는 주제어는 '온라인'과 '지원' '정책'이다. 이는 코로나19로 인해 사회적 거리두기의 일상화에 따라 비대면·온라인콘텐츠의 급부상과 예술계에 대한 지원정책이 필요함을 나타내고 있다고 볼 수 있다.

• Structural Engineering and Mechanics
• /
• 제45권5호
• /
• pp.677-691
• /
• 2013

A semi-analytical finite strip method is developed for analyzing the post-buckling behavior of rectangular composite laminated plates of arbitrary lay-up subjected to progressive end-shortening in their plane and to normal pressure loading. In this method, all the displacements are postulated by the appropriate harmonic shape functions in the longitudinal direction and polynomial interpolation functions in the transverse direction. Thin or thick plates are assumed and correspondingly the Classical Plate Theory (CPT) or Higher Order Plate Theory (HOPT) is applied. The in-plane transverse deflection is allowed at the loaded ends of the plate, whilst the same deflection at the unloaded edges is either allowed to occur or completely restrained. Geometric non-linearity is introduced in the strain-displacement equations in the manner of the von-Karman assumptions. The formulations of the finite strip methods are based on the concept of the principle of the minimum potential energy. The Newton-Raphson method is used to solve the non-linear equilibrium equations. A number of applications involving isotropic plates, symmetric and unsymmetric cross-ply laminates are described to investigate the through-thickness shearing effects as well as the effect of pressure loading, end-shortening and boundary conditions. The study of the results has revealed that the response of the composite laminated plates is particularly influenced by the application of the Higher Order Plate Theory (HOPT) and normal pressure loading. In the relatively thick plates, the HOPT results have more accuracy than CPT.