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가상공간 시뮬레이션을 활용한 고령자 행동특성 기반 계단 낙상사고 평가
양현철(Yang, Hyun-Cheul),나선철(Na, Sun-Cheol),김동현(Kim, Dong-Hyun),이재욱(Lee, Jae-Wook) 한국BIM학회 2018 KIBIM Magazine Vol.7 No.4
Due to the rapidly aging population, the death rate of elderly people by safety accidents has been increasing. In particular, precautions are needed for falls prevention because they either directly or indirectly cause death. In the case of elderly people, most of the fall accidents occur in dense residential areas, and particularly, the staircase poses a risk of falling. Therefore, a safety assessment should be performed from the design phase. However, in general, staircases are designed using existing stair data or only aims to satisfy the installation criteria. Laws and regulations only define minimum requirements for safety, so it is not possible to prevent fall accidents even if they satisfy the requirements. Therefore, this study proposes a simulation-based method for evaluating the safety of staircases. The behavioral characteristics of the elderly are implemented to an virtual user in a virtual space including staircases, and fall accidents are evaluated by the evaluation logic related to the behavioral characteristics. The result shows that the safety of staircases can be preevaluated and reflected on the design to reduce the possibility of fall accidents of the elderly.
인현철(Hyun-Cheol In),박광철(Kwang-Cheol Park),양세라(Se-Rah Yang),이정현(Jung-Hyun Lee) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.22 No.2A
한국어는 용언 중심 후행 언어로 하나의 문장은 여러 용언들의 구조적, 의미적 결합으로 구성된다. 본 논문에서는 말뭉치를 근거로 하여 동사가 가질 수 있는 패턴 정보들을 데이타 베이스화하고, 체언의 의미적 속성과 격정보를 이용하여, 구문 및 의미 분석을 통해 문장을 용언 중심의 개념 단위로 분리하는 분석 방법을 제시한다. 구문 및 의미 분석은 동사 패턴을 이용하는 단일화 연산을 통해 이루어 지며, 한국어 문장의 생략현상, 도치현상, 격정보 결여 성분 통제 및 복합문에서의 결여 성분을 통제 등을 쉽게 처리할 수 있다.
가상공간 시뮬레이션을 활용한 고령자 행동특성 기반 계단 낙상사고 평가
양현철,나선철,김동현,이재욱,Yang, Hyun-Cheul,Na, Sun-Cheol,Kim, Dong-Hyun,Lee, Jae-Wook 한국BIM학회 2017 KIBIM Magazine Vol.7 No.3
Due to the rapidly aging population, the death rate of elderly people by safety accidents has been increasing. In particular, precautions are needed for falls prevention because they either directly or indirectly cause death. In the case of elderly people, most of the fall accidents occur in dense residential areas, and particularly, the staircase poses a risk of falling. Therefore, a safety assessment should be performed from the design phase. However, in general, staircases are designed using existing stair data or only aims to satisfy the installation criteria. Laws and regulations only define minimum requirements for safety, so it is not possible to prevent fall accidents even if they satisfy the requirements. Therefore, this study proposes a simulation-based method for evaluating the safety of staircases. The behavioral characteristics of the elderly are implemented to an virtual user in a virtual space including staircases, and fall accidents are evaluated by the evaluation logic related to the behavioral characteristics. The result shows that the safety of staircases can be preevaluated and reflected on the design to reduce the possibility of fall accidents of the elderly.
조원호,이창주,장호근,양현철 대한골절학회 1991 대한골절학회지 Vol.4 No.1
The ankne is a modified hinge, complex weight bearing joint and has an important role in walking. And the lateral malleolus of fibula has important role in maintaining the stability of ankle joint supprting one-sixths of its weight, and moves 3mm downward on weight bearing. And its talar articular surface is 5.8 mm wider laterally than medially. And diastasis of the ankle joint is associated with extensive ligamentous rupture. Many various treatment about ankle fractures associated with diastasis have been reported, and rigid internal fixation with trans-syndesmotic screw fixation is a general opinion. But its complication and appropriate indications are rather troublesome. Recently, Boden reported establishment of stability of distal tibiofibular joinin diastasis combining fractures, without syndesmotic screw fixation. The following clinical results were shown by analysis of 11 cases of ankle fractures associated with diastasis, treated by rigid bimalleolar internal fixation without syndesmotic screw frxation in the Department of Orthopedic Surgery, Hallym University, College of Medicine for two years, from Jan. 1988 to Dec. 1989
백서 좌골신경에서 아드레날린이 국소마취제에 의한 복합활동전압의 억제에 미치는 영향
한성민,유재영,최윤,이동명,임승운,양현철,양홍석,임중우 대한마취과학회 1999 Korean Journal of Anesthesiology Vol.37 No.4
Background : Adrenaline has often been used to prolong the local anesthetic effect during surgical procedures. As a possible explanation for this, a local vasoconstriction caused by adrenaline has been proposed. However, in a recent study, clonidine, an α2 adrenergic receptor agonist, was reported to block the conduction of mammalian nerves in vitro. Thus, there is a possibility that adrenaline may block nerve conduction by acting on the adrenergic receptor. The present study is performed to see : (1) If adrenaline directly affects nerve conduction ; (2) If adrenaline affects conduction blockade caused by local anesthetic. Methods : Recordings of compound action potentials (CAPs) of A- and C-components were obtained from isolated sciatic nerves of adult male Sprague-Dawley rats. Dose-response curves of lidocaine and adrenaline regarding depression of CAPs were determined. Effects of adrenaline on the lidocaine-induced nerve block was assessed by comparing the effect of lidocaine (3.5× 10 5) with a licaine-epinephrine mixture (Lido-Epi, 3.5 ×10 5 lidocaine with 1:100,000 epinephrine). Results : Adrenaline, near the clinical concentrations, had no effect on the size of either A- or C-component of CAPs. The ED50 of lidocaine was 3.5× 10 5. Lidocaine depressed A-CAP 45.9± 7.0 when compared with baseline value, and the Lido-Epi solution depressed A-CAP to 41.7± 5.0 (P > 0.05). Lidocaine depressed C-CAP 59.8 ± 3.4 when compared with the baseline value, and the Lido-Epi solution depressed C-CAP to 60.5 8.1 (P > 0.05). Consequently, adrenaline did not augment lidocaine induced nerve blockade. Conclusion : This study confirmed that adrenaline applied to the peripheral nerve has no effect either on nerve conduction itself or on conduction block produced by lidocaine. (Korean J Anesthesiol 1999; 37: 675∼684)
Substance P Antagonist, [D-Arg, D-PHe, D-Trp, Leu]-Substance P 가 백서의 FCA 주입 후 유발된 기계적 통각과민에 미치는 영향
최윤,황승준,정수진,임중우,공현석,양현철,김민경,황재현 대한마취과학회 2000 Korean Journal of Anesthesiology Vol.38 No.1
Baokground : The effect of substance P (SP) on the hyperalgesia induced by inflammation is controversial, and as SP remains in the periphery just for a short period of time after release from the nerve ending, the contribution of SP on the development of Sustained mechanical hyperalgesia in rats with inflammation is questionable. The purpose of this experiment is to evaluate the effect of SP on the development of mechanical hyperalgesia induced by Freund's complete adjuvant (FCA) using SP antagonist [D-Arg, D-Phe,7-Trp, Leu]-substance P (SPA) . Methods: Male Sprague Dawley rats were divided into four groups control (normal saline) and three different doees of SPA (0.25 ug, 2.5 7ug,25 7g/0.1 ml). Inflammation was induced in rats by injecting 0.15 ml of FCA intraplantarly. Rats showed typical hyperalgesia within 12 hours after injection and maintained it for :Ibout one week. To test the effect of SPA on the developement of inflammation, either SPA or saliTle was injected at 1 h before and at the time of FCA injection under light halothaneanesthesia after a baseline test, The effect of SPA on hyperalgesia was assessed by measuring mechanical hyperalgesia at 2,6, 12,24 hrs and 4 days after injection of the drug. To test the effect of SPA 7l fully developed inf'lammation tests were done 2 days after injection of FCA. Mechanical hyperalgesias were assessed at 15, 30, 60, 90, 120 min after the drug injections. Results : SPA injected to suppress the initial SP spill over decreased the mechanical hyperalgesia in a dose dependent manner. SPA injected after the full development of inflammation also decreased mechanical hyperalgesia. Conclusions : SP released at the initial phase of inflammation as well as SP released after the development of inflammation are all important for the maintainance of mechanical hyperalgesia. ( Korean J Anesthesiol 2000 ; 38 : 158-163 )