• The Journal of Korean Physical Therapy
• /
• 제7권1호
• /
• pp.21-31
• /
• 1995

This study was described the movement patterns when rising from supine to erect stance. Two hundred eighty seven subjects, ranging in age from 6 year to 28 were filmed while rising from a supine position. Movement Patterns were classified using categorical descriptions of the action of three body regions-the upper and lower extremity, head-trunk region. This study was designed to determine whether within the rising task the movement patterns of different regions of the body vary with age level and sex. The incidence of each movement pattern was calculated and graphed with respect to age level and sex. The most common form of rising for subject in the 6, 7 year mate group usually involved push and reach pattern with upper extremity, half kneel pattern with lower extremity, partial rotation pattern with head-trunk. In the 6, 7 year female group usually involved symmetrical push pattern with upper extremity, symmetrical squat with balance step pattern with lower extremity, symmetrical interrupted by rotation pattern with head - trunk. In the teenage and twenties both sex group usually involved symmetrical push pattern with upper extremity, symmetrical squat pattern with lower extremity, partial rotation pattern with head-trunk.

• 한국의류산업학회지
• /
• 제22권4호
• /
• pp.523-533
• /
• 2020

Previous studies are used to examine cellulose content, degumming period, fiber quality, production yield, production cost, development limit of fiber according to physical, chemical, and microbial degumming methods. Three types of degumming methods are used to measure surface condition after degumming, necessity of additional degumming and degree of impurity removal. First, previous studies confirmed that the microbial degumming method is superior in terms of cellulose content, fiber quality, production yield, production cost, and fiber development possibility. Second, surface condition and the necessity of additional degumming were analyzed by SEM. The black skin binding material was removed in the case of the Sangnangyi and chemical degumming; however, it was insufficient and further degumming was required. Skin fiber binding material was removed in the case of microbial degumming and the surface was cleanest after degumming; in addition, most showed the form of yarn decomposition. The FT-IR spectrum determined the degree of removal of impurities and showed that it can utilize inherent physical properties as the best degumming method. The degree of removal of pectin and lignin by microbial degumming was cleanest with hemicellulose also reduced by microbial degumming.

• 전자공학회논문지SC
• /
• 제41권6호
• /
• pp.61-66
• /
• 2004

최소한의 피폭선량으로 고품질의 영상진단정보를 제공하기 위하여 노후화 및 불량인 장비를 선량과 해상력을 이용하여 평가하며, 국내특수의료장비 법제화를 위한 실태파악을 토대로 국내실정에 맞는 기준치를 개발하는 것이 논문의 목적이다. 전국 29개병원에 설치되어 있는 혈관조영장비 46대를 대상으로 입사선량율(EER) 및 입력형광면조사선량(IPER)을ion chamber로 측정하였고, Burger Rose 팬텀을 사용하여 투시영상의 저대조도 해상력을 측정하였다. 현재 대학병원 및 종합병원에서 사용되는 혈관조영 장비의 현상태를 파악함으로써 장비의 노화정도를 예측하고 부적절한 장비의 사용제한을 목적으로 종합평가 결과의 통계치로1안(1)과 2안(2)으로 구분하여 기준안을 작성하였다. 해상력 및 선량으로 장비를 조사하였을 때, 91%의 혈관조영X-선 장치가 기준 이상의 성능을 갖추고 있었으며 기준 미달의 장치의 경우 병원에서 교체를 검토하고 있음을 확인할 수 있었다.

• Advances in materials Research
• /
• 제4권2호
• /
• pp.113-132
• /
• 2015

The phenomena of high-voltage polarization and conductivity in oriented vinylidenefluoride and tetrafluoroethylene copolymer films have been investigated. It was shown that under certain electric fields, injection of carriers from the material of electrodes appears The barrier for holes injection in the copolymer was found to be lower than that for electrons. It results in more effective screening of the external field near the anode than near cathode. Electrones, ejected from cathode, creating negative charge by trapping on the surface. It is shown that the electrons injected from cathodes create a negative homocharge on the copolymer surface and then become captured on the surface shallow traps. Their nature has been studied by the x-ray photoelectron spectroscopy. It was shown that these traps may consist of chemical defects in the form of new functional groups formed by reactions of surface macromolecules with sputtered atoms of aluminum. The asymmetric shape of hysteresis curves was explained by the difference in mobility of injected holes and electrons. These factors caused appearance of "non-closed" hysteresis curves for fluorine-containing polymer ferroelectrics. Hysteresis phenomena observed at low electric fields (below coercive ones) are to associate with the behavior of the domains localized in the ordered regions formed during secondary crystallization of copolymers.

• 한국식품영양과학회지
• /
• 제24권4호
• /
• pp.493-501
• /
• 1995

To investigate an effect of dietary sodium and potassium on blood pressure, 418 adolescents living in Kangwha area were studied. Two measurements were taken on each blood pressure(diastolic, systolic) and the average of the two readings was used in the analysis. Sodium and potassium intake were estimated by the determination of those electrolytes in 24hr urine. Not only dietary factors but also physical growth factors such as weight, height, arm-circumference and skinfold-thickness were induced in the stepwise multiple regression analysis to indentify the relative importance between the factors. The variation of blood pressure both in systolic and diastolic in both sexes was inconsistent with the levels of sodium and potassium intake. The results of multiple regression analysis showed that the physical growth were more influential than nutrient factor. It suggested that hypertension risk factors observed form the adults, may not be identical with that of the growing aged population. After control of the physical growth, there was no significant variation observed by the level of sodium and potassium intake on blood pressure. In summary, the results indicate that growth has been more influential than dietary factor on blood pressure for growing aged population.

• 한국전자통신학회논문지
• /
• 제11권6호
• /
• pp.611-618
• /
• 2016

제안한 논문은 통신 네트워크 및 관련 시스템 기술에 관한 연구로 USB메모리와 클라우드 스토리지 영역을 동시에 동기화하여 네트워크 오류에 따른 클라우드 스토리지 영역 사용부재 또는 USB 메모리를 분실하는 상황이 발생되더라도 데이터를 안전하게 유지관리하기 위한 기술설계이다. 클라우드를 활용하는 사용자들의 안전한 문서관리 정책의 필요성을 기반으로 매체의 분실 및 네트워크의 오류에 따른 대책을 하이브리드형 클라우드 시스템으로 설계구축하고, 사용자의 편리성에 따른 자동 및 수동 동기화 방법을 설계한다. 마지막으로 윈도우즈 환경에 적합한 사용자의 편의보장을 위해 탐색기형 스토리지 UI를 설계함으로써 점차 늘어나는 클라우드 사용자의 안전성과 편리성을 모두 보장해주기 위한 시스템설계이다.

• 한국통신학회논문지
• /
• 제37권5A호
• /
• pp.317-324
• /
• 2012

물리 계층 네트워크 코딩은 양방향 중계 채널에서의 Zhang 그룹의 논문으로 처음 소개 되었다. 물리 계층 네트워크 코딩을 이용하여, 세 개의 시간대 대신에 두 개의 시간대내로 양방향 통신을 완벽히 할 수 있다. 최근 감쇄 채널에서 물리 계층 네트워크 코딩의 상계와 하계가 모두 분석되었다. 이 논문에서는 감쇄 채널에서 양방향 중계 채널의 물리 계층 네트워크 코딩의 정확한 bit 오류 비율을 도출 하였다. bit 오류 비율을 계산하기 위해, 판단 영역을 최소 인접 법칙과 Craig's 극좌표 방식을 적용한 몇 개의 쐐기 부분의 분할을 통해 결정 하였다.

• The Journal of Korean Physical Therapy
• /
• 제28권3호
• /
• pp.183-188
• /
• 2016

Purpose: The aim of the study was to investigate neck posture, range of motion, muscle endurance and self-report of pain and disability in smartphone users. Methods: Seventy-eight university student volunteers, aged between 18 and 30 years (mean age 23.2), were assessed for: a head-neck posture by measuring cranial vertical angle, neck range of motions using cervical range of motion device, and a deep neck flexor endurance using a stabilizer. Finally, subjects were asked about their neck pain and completed disability questionnaires, ie, Short Form McGill Pain Questionnaire, Neck Disability Index, and World Health Organization Disability Assessment Schedule 2.0. Results: Thirty-eight subjects experienced recurrent neck pain with/without upper limb pain (neck pain group) and 40 reported no current neck pain with/without upper limb pain (no neck pain group). Differences were found between groups on pain and disability questionnaires. Subjects with neck pain had significantly higher disability scores than those of no neck pain group. However, there were no differences observed between groups in a head-neck posture, neck range of motions, and deep neck muscle endurance time. The smartphone usage time was negatively correlated with neck pain intensity and disability score whereas it had positive relationship with flexibility and posture. Conclusion: Group differences were observed as lower capacity not only for neck specific daily activities but for general functioning in daily routine when the neck pain and no neck pain groups were compared. Therefore, functioning in daily activities should be investigated as prevention for further developing neck pain in smartphone users.

• 한국환경과학회지
• /
• 제15권1호
• /
• pp.45-58
• /
• 2006

In order to grasp physical characteristics of Ganajin Bay receiving the effluents from land, a comprehensive field surve)'has been conducted at the north of Wando and Gogeumdo in 2002. Water temperature was most high in September while most low in December. A high temperature in September was inferred to have caused by the dispersion of warm fresh water with favor of a dominant wind in autumn. However, salinity and sigma-t in situ was most low in September while most high in December. A low salinity (or density) in September turned out to reflect the influence of a dense rainfall in summer. Water temperature, salinity and density at the surface layer were lower than those at the bottom layer, except for December. Their horizontal profiles suggested the influence of effluents such as Tamjin River. Particularly, time series of water temperature acquired near the sluice and at the north channel of Wando tended to rise at the flood flow but fall at the ebb flow in accordance with the tide. The form ratio of the tide in the study area was $0.31\~0.32$ and the amplitude of the tide appeared to increase towards the west. Northeastward or southwestward flows prevailed in this area but the residual flows were all northeastward with a magnitude of $3\~4cm/s$.

• 국제물리치료학회지
• /
• 제9권4호
• /
• pp.1657-1662
• /
• 2018

This epidemiological study aims to determine the incidence, areas, severity, and time of occurrence of sports injuries in elite female rowing athletes who were training at the Jincheon National Training Center for a 1-year period from January 1st to December 31st, 2017. According to the daily injury reports form of the IOC, sport events, weight division, injured area, and cause of injury were recorded, and the following results were found. Upon comparing the incidence of sports injuries, there was a significant difference in weight of double scull athletes. In terms of sports, there was a significant difference between pair and athletes who played double skull. Injuries occurred most commonly in the lower extremity (40.5%), followed by the trunk (35.1%), upper extremity (24.3%). for all athletes in rowing. The knee and lumbar spine/lower back were the most common injury sites. More than 60% of all injuries were Level III, and injuries occurred most frequently during training, followed by weight training and then competition.