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장종성,이명희,Chang, Jong-Sung,Lee, Myoung-Hee 대한물리치료학회 2014 대한물리치료학회지 Vol.26 No.4
Purpose: The purpose of this study was to compare plantar foot pressure distribution in adults and elderly according to obstacle height. Methods: Nine healthy adults and nine older adults were recruited and the subjects provided written informed consent consent prior to participation. Both groups walked and crossed obstacles with heights of 0%, 10%, 20%, and 30% of their height. Foot pressure was measured by peak pressure using the Pedar System (Novel Gmbh, Germany) during obstacle walking with barefeet in shoes. Three trails were calculated on eight areas and then averaged for data analysis. Results: A significant difference in great toe, little toes, and lateral metatarsal area was observed between adults and elderly groups, but other areas did not show significant differences. Foot pressure was increased in groups according to obstacle height. Conclusion: These findings showed that change in foot pressure distribution is more lateral in elderly in order to maintain postural control during obstacle crossing.
보행 시 편평족에서 외적 무게 부하에 따른 족저압의 변화
장종성 ( Jong Sung Chang ),박지원 ( Ji Won Park ),김중선 ( Chung Sun Kim ) 대한물리의학회 2010 대한물리의학회지 Vol.5 No.4
Purpose:The study was designed to investigate the changes of plantar foot pressure by different loads during walking in flatfoot. Methods:Fifteen subjects with flatfoot were recruited along with their written informed consent. They were asked to walk on plate at a self-selected and comfortable speed with loads of 0, 5, 10, and 15㎏. Three walking trials were obtained and then averaged for data analysis. Foot pressure were measured from RS-Scan system (RS-Scan system, RS scan Ltd., German) and contact area, maximum force were analyzed. Results:There were significant increases on midfoot and decreases on forefoot in contact area. And there were significant increases in maximum force of foot pressure of 2nd metatarsal bone and midfoot. Conclusion:These findings revealed that flatfoot increases risk factors of metatarsal bone with different loads. Therefore, patients of flatfoot must be careful during walking with loads or activities of daily living.
장종성 ( Jong Sung Chang ),최진호 ( Jin Ho Choi ),이미영 ( Mi Young Lee ),김명권 ( Meuung Kwon Kim ) 대한물리의학회 2012 대한물리의학회지 Vol.7 No.1
Purpose:The study was designed to investigate analysis of kinematics of lower extremity in healthy adults during walking with external loads on trunk. Methods:Fifteen healthy adults were recruited and The subjects provided written and informed consent prior to participation. They walked on a ten-meter walkway at a self-selected pace with loads of 0, 5, 10, and 15kg. They completed three trials in each condition and kinematic changes were measured. A three-dimensional motion analysis system was used to analyze lower extremity kinematic data. The data collected by each way of walking task and analyzed by One-way ANOVA. Results:There were significant differences in hip and knee joint on saggittal plane at initial contact and preswing, and significant differences in ankle joint on transverse plane at preswing. Conclusion:These findings revealed that increased external loads were changed joint angles and influenced postural strategies because of kinematic mechanism and future studies is recommended to find out prevention from damage of activities of daily living.
장종성 ( Jong Sung Jang ),정광식 ( Kwang Sik Chung ),손진곤 ( Jin Gon Shon ) 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.1
다중서명에서는 보안적 요소뿐만 아니라 다중서명의 길이, 다중서명의 생성 및 검증 시간, 복호화 시간, 통신량 등도 중요한 요소이다. 기존의 RSA를 그대로 이용한 RSA 원형 다중서명 방식과 RSA를 변형하여 적용한 RSA 변형 다중서명 방식은 다중서명의 생성 및 검증 시간이 각각의 개인서명을 생성하고 검증하는 시간의 합과 비례하여 증가한다는 문제점이 있다. 본 논문은 서명자의 수만큼 분할된 각각의 부분메시지에 대해 RSA 방식을 이용하여 제각기 서명하는 다중서명 방식을 제안한다. 제안된 메시지 분할을 이용한 RSA 다중서명 방식은 블록의 수가 증가하지 않는 경우 기존 방식에 비해 다중 서명의 길이가 증가하지 않으면서, 다중서명의 생성 및 검증 시간이 각각 □로 감소하고, 복호화 시간과 통신량은 각각 약 □~ □로 감소한다.
장종성,노영철 최신의학사 1971 最新醫學 Vol.14 No.6
Ovarian pregnancy is a rare type of ectopic gestation. Three cases of ovarian pregnancy have occured during the past 4 year at St. Mary's Hospital, Catholic Medical College, from January 1, 1967 to December 31, 1970. The incidences, causes, symptoms, physiological mechanism, classification and diagnostic criteria of it and comparison with those reported in the literature are presented.
장종성,이전형 대한물리치료학회 2015 대한물리치료학회지 Vol.27 No.1
Purpose: The purpose of this study is to investigate differences of cervical flexor muscle thickness (i.e., sternocleidomastoid muscle anddeep cervical flexor muscles) depending on levels of pressure bio-feedback unit and eye directions during cranial-cervical flexor exercisein healthy subjects. Methods: A total of 30 subjects (12 males and 18 females) who had no medical history related to musculoskeletal and neurological disorderswere enrolled in this study. They were instructed to perform cranial-cervical flexion exercise with adjustment of five different pressures(i.e., 22 mmHg, 24 mmHg, 26 mmHg, 28 mmHg, and 30 mmHg) using a pressure biofeedback unit, according to three different eyedirections (i.e., 0°, 20°, and 40°). Muscle thickness of sternocleidomastoid muscle and deep cervical flexor muscles was measured accordingto pressure levels and eye directions using ultrasonography. Results: In results of muscle thickness in sternocleidomastoid muscle and deep cervical flexor muscles, the thickness of those muscles wasgradually increased compared to the baseline pressure level (22 mmHg), as levels in the pressure biofeedback unit during cranial-cervical flexionexercise were increasing. In addition, at the same pressure levels, muscle thickness was increased depending on ascending eye direction. Conclusion: Our findings showed that muscle thickness of sternocleidomastoid muscle and deep cervical flexor muscles was generally increasedduring cranial-cervical flexion exercise, according to increase of eye directions and pressure levels. Therefore, we suggested thatlower eye direction could induce more effective muscle activity than the upper eye direction in the same environment during cranial-cervicalflexion exercise.