• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1993년도 ACT 93
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• pp.202-207
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• 1993

• 동굴
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• 제71호
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• pp.13-17
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• 2006

New methods of nano sized material and composite coating preparations have been considered on the base of mathematical model of abrasion reaction interaction of milling and grinding bodies in planetary centrifugal mill. The essence of the method is the abrasive and oxidative wear of the milling bodies and amorphous (better inert) additives. Interactions between them has been supplied the necessary impulse of pressure and temperature on the impact frictional contacts and promoted chemical processes. The offered method can find application for such processing as sintering and geological minerals opening.

• Journal of Preventive Medicine and Public Health
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• 제47권4호
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• pp.230-235
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• 2014

Objectives: The aim of this study was to investigate whether the health status of Republic of Korea Air Force (ROKAF) soldiers changed after one year of military service. Methods: We selected 483 ROKAF soldiers from the 11 749 recruits who participated in the 2011 physical examination. The selected soldiers underwent another physical examination in 2012 for advancement to senior airman. Data from 2011 and 2012 were merged. To collect data on lifestyle, a questionnaire was sent to all included subjects via the military intranet e-mail service. Results: The percentage of recruits with an abnormal alanine transaminase level (normal range <40 IU/L) decreased from recruitment (13.7%) to the following year (2.7%). Moreover, the percentage of obese soldiers (body mass index ${\geq}25kg/m^2$) decreased from recruitment (20.5%) to the following year (10.4%). There was a significant change in mean duration of exercise carried out each day before ($0.8{\pm}1.3$ hours) and after ($1.0{\pm}0.7$ hours) joining the ROKAF service. Conclusions: These ROKAF soldiers were generally in good health before and after joining the armed service. After one year of military service, the health status of most soldiers improved, especially with respect to body mass index and alanine transaminase level.

• 공학교육연구
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• 제24권5호
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• pp.38-45
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• 2021

The CanSat was designed as an educational satellite simulation program that implements the overall system of the satellite such as the command processing unit, the communication unit, and the power unit in a structure of the size of a can. In particular, the training effect is very excellent because the trainee can learn a process similar to the actual satellite development process by designing, manufacturing, testing, and launching. Republic of Korea Air Force Academy has been using the CanSat production kit used by the domestic can satellite contest experience department for education, but since it was produced based on PCB, it was impossible to show creativity and operation was restricted even with small mistakes. In this paper, we analyze the existing CanSat kit and propose a new educational CanSat kit that can be used in creative engineering design and practice subjects that will be reorganized into a regular course from 2021, and a lesson plan. In conclusion, by using the proposed CanSat kit for lectures, it is possible to achieve educational purposes and effects, improve lecture satisfaction, and provide stable instruction.

• 대한임상독성학회지
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• 제3권2호
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• pp.93-98
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• 2005

Purpose: This study was to investigate the resuscitation outcomes and the clinical characteristics of non-traumatic drug-induced out-of-hospital cardiac arrest by analyzing data from a single institution's registry. Method: We conducted a retrospective study of 795 patients who came to the emergency department with non-traumatic drug-induced out-of-hospital cardiac arrest during the period $1991{\~}2004$. Only patients over 18 years of age were included. Clinical characteristics. variables associated with cardiac arrest, and data during resuscitation were obtained from our cardiac arrest database. Patients were divided into two groups: drug-induced cardiac arrest (drug group, n=33), and non drug-induced cardiac arrest (non-drug group, n=762). Results: Spontaneous circulation was restored in 23 ($72{\%}$) patients in the drug group and in 314 ($45{\%}$) patients in the non-drug group ($x^2=0.020$). The patients who discharged alive number were 46 ($6{\%}$) in the non-drug group and 0 ($0{\%}$) in the drug group ($x^2=0.005$). The witnessed arrest, the epinephrine doses, and total defibrillation energy were not different between two groups. Conclusion: The return of spontaneous circulation rate was higher in the drug group than the non-drug group. However the drug group was lower survival discharge rate than in the non-drug group.

• 한국항공우주학회지
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• 제50권8호
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• pp.573-581
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• 2022

본 논문은 단풍나무 씨앗형 자동회전 과학 탑재체 2개를 사출하고 기상정보를 수집하는 임무를 하는 캔위성을 개발하는 내용을 다루고 있다. 캔위성은 2개의 자동회전형 과학 탑재체와 이를 실을 수 있는 캔위성 본체로 구성된다. 캔위성 본체는 과학 탑재체를 사출하기 위한 장치들과 지상국과의 통신을 위한 장치들을 탑재하고, 각기 다른 지정 고도에서 과학 탑재체를 하나씩 사출한다. 과학 탑재체는 큰 날개와 탑재 공간으로 구성되며, 큰 날개는 회전하면서 양력을 발생시켜 낙하 속도를 늦춘다. 구체적으로, 사출된 이후 20m/s 이하의 속도로 하강하며 회전율, 기압과 온도를 측정하고 초당 1회의 속도로 측정값을 캔위성본체로 송신한다. 통신 시스템은 마스터-슬레이브 구조로 과학 탑재체는 모든 데이터를 마스터인 캔위성본체로 송신하고, 캔위성 본체는 수신받은 데이터와 자체 데이터를 종합하여 지상국으로 전송한다. 자체 개발한 지상국 소프트웨어를 이용해 수신하는 모든 데이터를 실시간으로 확인할 수 있다. 시뮬레이션 환경에서 모의실험을 수행했고, 임무 요구조건을 만족하는 캔위성의 성능을 확인할 수 있었다.

• The Journal of Asian Finance, Economics and Business
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• 제2권3호
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• pp.23-32
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• 2015

The aim of this work is to study the specifics of demographic processes in the Republic of Kazakhstan and to justify proposals concerning improvement of tendencies and methods of realizations of demographic policy in the country. The following methods have been used in this study: the principles of system approach; methods of statistical and comparative economic analysis, sociological analysis; method of expert evaluations; generalization and system analysis. Statistical method is based on the accountability of statistics office of the Ministry of National Economy of the Republic of Kazakhstan (RK) and on the results of sociological studies. The official statistic information, materials of the population census of the RK, materials of the Ministry of Health and Social Development of RK, data from author's studies, carried out in the Institute of Economy of science committee of Ministry of Education and Science of the Republic of Kazakhstan were used in this study. The conclusion about positive tendencies in demographic processes and about necessity of improvement of demographic policy was made. A number of proposals and recommendations concerning creation of favorable social and economic conditions for improvement of demographic situation, enhancement of institutional basis of demographic policy, forms and methods of its realization considering priorities of future development of Kazakhstan were justified.

• 물과 미래
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• 제35권5호
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• pp.21-30
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• 2002

The inflow into a multi-purpose dam reservoir contains many suspended solids from the upper stream during the rainy season. Concentrations of SS increased to 73.3 mg/l and the TP measurement increased to 0.09 mg/l during the rainy season in 1999. It was discovered that particles less than $10\;\mu\textrm{m}$ in size composed about 50% of the total amount. Some of these particles reduce the reservoir capacity and have an impact on water. In this study, the sediment depth at Daecheong multi-purpose dam was examined. Piston coring was performed at 9 locations At Hoenam 1 out of 9 locations examined showed maximum depth, which was 90 cm and at Muneui 3 showed the minimum depth, which was 35 cm. At Hoenam, the release rate of TN was found to be $62.14~84.72\;mg/\textrm{m}^2{\cdot}day$ in 1998. However, it was found to considerably reduced to $23.20\;mg/\textrm{m}^2{\cdot}day$ in 2001. The release rate of TP was measured at $13.02~14.38\;mg/\textrm{m}^2$.day at 1998, and it was reduced to $6.93mg/\;mg/\textrm{m}^2{\cdot}day$ in 2001.

• 대한물리의학회지
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• 제17권2호
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• pp.21-28
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• 2022

PURPOSE: This study examined the effect of changes in the knee angle and weight shifting of the sole on the activity of the lower extremity muscles during bridge exercise. METHODS: The subjects of this study included 20 healthy adult women (mean age 29.8 ± 4.32). The subjects performed the bridge exercise under three weight-shifting conditions general bridge (GB), hindfoot press bridge (HPB), and fore-foot bridge (FPB) and at two knee angles (90° and 60°). During the bridge exercise, the activity of the quadriceps femoris (rectus femoris, vastus medialis oblique, and vastus lateralis) and biceps femoris muscles were measured using an electromyography sensor. RESULTS: In the quadriceps femoris, the muscle activity of HPB and FPB was significantly higher than that of the GB at knee angles of 90° and 60° (p < .05). In the biceps femoris, the muscle activity increased significantly in the order of GB < HPB < FPB, and the knee angle increased significantly at 60° rather than at 90° (p < .05). There was no significant difference according to the knee angle in all muscles except for the biceps femoris. CONCLUSION: These findings suggest that the weight-shifting bridge of sole bridge exercise was more effective in increasing the activation of the lower extremity muscles than the GB.

• Parasites, Hosts and Diseases
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• 제56권6호
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• pp.545-552
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• 2018

Plasmodium vivax is more challenging to control and eliminate than P. falciparum due to its more asymptomatic infections with low parasite densities making diagnosis more difficult, in addition to its unique biological characteristics. The potential re-introduction of incidence cases, either through borders or via human migrations, is another major hurdle to sustained control and elimination. The Republic of Korea has experienced re-emergence of vivax malaria in 1993 but is one of the 32 malaria-eliminating countries to-date. Despite achieving successful nationwide control and elimination of vivax malaria, the evolutionary characteristics of vivax malaria isolates in the Republic of Korea have not been fully understood. In this review, we present an overview of the genetic variability of such isolates to increase understanding of the epidemiology, diversity, and dynamics of vivax populations in the Republic of Korea.