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박종욱,권구정,김병일,이정윤,Park, Jong-Wook,Kwon, Koo-Jung,Kim, Byoung-Il,Lee, Jung-Yoon 대한건축학회 2011 대한건축학회논문집 Vol.27 No.8
Plastic hinges are generally developed at both ends of reinforced concrete (RC) beams in the post-yield region. To complete the plastic deformation mechanism, column plastic hinges at the base of the structure are also required. The longitudinal axial strain in the plastic hinge regions of RC columns has a significant influence on the behavior of RC structures subjected to reversed cyclic loading. This strain affects energy dissipation in the hysteretic response by causing the sliding along interconnecting wide flexural cracks. In addition, the strain also influences on the deformability of RC structures. In order to investigate the effects of the axial force on the axial strain in the plastic hinge region of RC members, experimental and analytical study was performed with ten RC members subjected to reversed cyclic loading. The experimental and analytical results indicated that the axial force significantly decreased the axial strain in the plastic hinge region of RC members.
부산 일부지역 근로자들의 재해성 요부손상에 대한 사회의학적 조사
박종욱,김돈균,이수일,조병만,조봉수,김영욱,Park, Jong-Ook,Kim, Don-Kyoun,Lee, Su-Ill,Cho, Byung-Mann,Cho, Bong-Soo,Kim, Young-Wook 대한예방의학회 1994 Journal of Preventive Medicine and Public Health Vol.27 No.2
This survey was performed to obtain the basic information for the prevention and management of occupational low back injury (LBI). The subjects of this survey were 952 workers (male, 892 ; female, 60) who had taken occupational LBI in some industries of Pusan area from January 1 to December 31, 1991. Observation period was 2.6 years from the beginning to the end of medical treatment. The obtained results were summarized as follows ; 1. The proportion of LBI workers was 15.9% of the workers who had taken any occpational injuries and 0.32% of all workers in this surveyed area. 2. 8.0% of the workers had taken LBI on the 1st day of employment and 55.2% of the workers were within one year, 91.4% of the workers were within 10 years according to cumulative frequency distribution. 3. Handling of heavy objects was the most common cause of LBI (32.0%) and fall down (26.9%) and slip down (16.3%) were the next in order. 4. The most common causes of both lumbar sprain and HNP were handling of heavy objects and that of lumbar fracture was fall down. 5. The mean duration for medical treatment of LBI workers was 143 days. 6. The total direct compensation cost for LBI workers was 6,736 million Won and the proportion of medical, resting, disability compensation costs were 25.0%, 37.0%, 38.0 % respectively. 7. The percentages of retreated workers and disabled workers were 11.9% (113 persons) and 22.9% (218 persons) of total LBI workers respectively.
박종욱,이전,이효기,김호중,이경중,Park, Jong-Uk,Lee, Jeon,Lee, Hyo-Ki,Kim, Hojoong,Lee, Kyoung-Joung 대한의용생체공학회 2013 의공학회지 Vol.34 No.3
Respiratory signal is one of the important physiological information indicating the status and function of the body. Recent studies have provided the possibility of being able to estimate the respiratory signal by using a change of PWV(pulse width variability), PRV(pulse rate variability) and PAV(pulse amplitude variability) in the PPG (photoplethysmography) signal during daily life. But, it is not clear whether the respiratory monitoring is possible even during sleep. Therefore, in this paper, we estimated the respiration from PWV, PRV and PAV of PPG signals during sleep. In addition, respiration rates of the estimated respiration signal were calculated through a time-frequency analysis, and errors between respiration rates calculated from each parameter and from reference signal were evaluated in terms of 1 sec, 10 sec and 1 min. As a result, it showed the errors in PWV(1s: $36.38{\pm}37.69$ mHz, 10s: $36.53{\pm}38.16$ mHz, 60s: $30.35{\pm}38.72$ mHz), in PRV(1s: $1.45{\pm}1.38$ mHz, 10s: $1.44{\pm}1.37$ mHz, 60s: $0.45{\pm}0.56$ mHz), and in PAV(1s: $1.05{\pm}0.81$ mHz, 10s: $1.05{\pm}0.79$ mHz, 60s: $0.56{\pm}0.93$ mHz). The errors in PRV and PAV are lower than that of PWV. Finally, we concluded that PRV and PAV are more effective than PWV in monitoring the respiration in daily life as well as during sleep.
비강압력신호를 이용한 수면호흡장애 환자의 수면/각성 분류
박종욱,정필수,강규민,이경중,Park, Jong-Uk,Jeoung, Pil-Soo,Kang, Kyu-Min,Lee, Kyoung-Joung 대한의용생체공학회 2016 의공학회지 Vol.37 No.4
This study proposes the feasibility for automatic classification of sleep/wakefulness using nasal pressure in patients with sleep-disordered breathing (SDB). First, SDB events were detected using the methods developed in our previous studies. In epochs for normal breathing, we extracted the features for classifying sleep/wakefulness based on time-domain, frequency-domain and non-linear analysis. And then, we conducted the independent two-sample t-test and calculated Mahalanobis distance (MD) between the two categories. As a results, $SD_{LEN}$ (MD = 0.84, p < 0.01), $P_{HF}$ (MD = 0.81, p < 0.01), $SD_{AMP}$ (MD = 0.76, p = 0.031) and $MEAN_{AMP}$ (MD = 0.75, p = 0.027) were selected as optimal feature. We classified sleep/wakefulness based on support vector machine (SVM). The classification results showed mean of sensitivity (Sen.), specificity (Spc.) and accuracy (Acc.) of 60.5%, 89.0% and 84.8% respectively. This method showed the possibilities to automatically classify sleep/wakefulness only using nasal pressure.