• Journal of the Korean housing association
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• v.19 no.5
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• pp.103-110
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• 2008

The purpose of this study is to know how visual-field obstruction from fire smoke influences a resident's necessary time to reach fire escape and evacuation movement in a high-rise apartment housing. Generally, fire smoke not only gives visual-field obstruction and breath troubles to residents but interrupts their evacuation behavior. If a fire smoke layer is formed in the core department when evacuee enters at the evacuation staircase until, residents will be made to undergo a range of vision obstacle. In order to set a situation like that, participants wore eye bandage which had been made especially before the experiment. Also as a comparative standard, through no.1442 Japanese construction ministry notices about the building evacuation safety verification method, this study calculated smoke layer's dissent time and evacuation time. Then to compare with the former, the participants without an eye bandage joined a experiment once again. This study has understood how fire smoke effects on one's evacuation delay by analyzing residents' evacuation time to reach the staircase and movement route, however, in this study a toxic gas is not considered because it might threaten participants not to breathe.

• Journal of the Ergonomics Society of Korea
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• v.18 no.1
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• pp.25-39
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• 1999

Among older persons falls are the leading cause of death resulting from injury. The research was conducted to investigate the effects of transitional floor surfaces and visual field obstruction on gait mechanisms in the elderly. Ten college students and ten elderly individuals participated in the experiment. The results indicated that walking on transitional floor surfaces and carrying a light load changed the elderly individuals biomechanical parameters of gait mechanisms more significantly than their younger counterparts in terms of slip severity. The result implies that the types of floor material placed in the homes of elderly individuals and in public places should minimize transitional floor surfaces and the elderly individuals should be made aware of the danger of slipping even when carrying a light load.

• Journal of Chest Surgery
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• v.24 no.7
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• pp.732-738
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• 1991

Membranous obstruction of the inferior vena cava[IVC] is a rare congenital anomaly that may present clinical features of Budd-Chiari syndrome caused by chronic obstruction of hepatic drain. We have experienced a case of IVC obstruction caused by hour-glass constriction and membrane in its center. Operative correction was accomplished using profound hypothermia [20%] and total circulatory arrest of 26 minutes. This technique permitted resection of membrane with direct vision and removal of thrombus of IVC and hepatic vein. After then constricted IVC was repaired with autologous pericardial patch. Total circulatory arrest was used intermittently for good visual field. Postoperative course was smooth and postoperative angiography showed unobstructed flow through the IVC in spite of slight constriction of cavoatrial junction and nearly complete disappearance of collateral vessels.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.39 no.3
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• pp.39-46
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• 2016

Loss of postural stability can possibly lead to slip and fall accidents in the number of workplaces and everyday life. This study was aimed to examine the effects of whole body fatigue and partially limited visual field on the ability of maintaining postural balance during quiet standing. A group of twelve healthy male subjects participated in the experiment. Before and after experiencing the whole body fatigue induced by bicycling exercises, the position coordinates of subject's center of pressure (COP) were obtained under the two levels of visual field condition (i.e., open visual field and limited visual field). Four levels of the whole body fatigue examined were rest, 300watt, 600watt, and 900watt. Position coordinates of COPs measured on a force plate were then converted into the total length of postural sway path in both the medio-lateral (ML) direction and the anterior-posterior (AP) direction. Two-way ANOVA result showed that the length of sway path in the AP direction became significantly larger as the whole body fatigue accumulated. Post-hoc test revealed statistically significant differences between rest and 900watt and between 300watt and 900watt. The significant increase of the sway length was also found when the visual field was partially obstructed by the boxes. In the ML direction, however, there was no statistically significant difference of the postural sway in both the AP and ML directions. The results imply that the ability of maintaining postural stability can be reduced significantly due to such tasks along with whole body fatigue. The postural balance can also be impaired by the limited visual field.

• KIEAE Journal
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• v.7 no.2
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• pp.9-15
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• 2007

Right of view out is one of the most important environmental factors that provide biological comfort and physical stability. Construction of high rise apartment buildings have caused to increase view obstruction cases and conflicts. Generally, when a field of a vision is completely blocked by other building, the percentage of a view is 0% and if the percentage is over 40%, it is regarded as acceptable. Autodesk VIZ program and the authors'-developed program were applied to evaluate a view right in apartment buildings and its effectiveness was verified by comparing computer simulation with actual photos.

• Journal of Chest Surgery
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• v.20 no.4
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• pp.773-779
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• 1987

MOVC is an uncommon disease which can be corrected by surgical method if early detected. A case of a 34-year-old male with MOVC is reported. Operation was done on cardiopulmonary bypass with circulatory arrest under moderate hypothermia. The incision was done both on the RA extending to level of suprahepatic IVC and on the IVC just proximal to the right renal vein. And then, thrombectomy and membranectomy under the direct visualization was done. Total circulatory arrest was used intermittently in order to get good visual field and for preventing blood loss. The Postop. course was good except one episode of hepatic encephalopathy which was persisted for 12 hours and then controlled by conservative measures.