• Journal of KIISE:Computer Systems and Theory
• /
• v.28 no.6
• /
• pp.268-277
• /
• 2001

최소의 다중전송 지연시간을 갖기 위하여 다중 목적지 패킷의 경로 길이와 웜의 초기화 횟수를 최소화한 다중전송 알고리즘을 제안한다. 그 알고리즘은 교착이 탈출 채널에서 복구되면서 단일 전송과 다중전송 메시지에 대하여 완전 적응하며 교착이 발생하지 않게 한다. Disha로 동시에 경로 기반 다중 전송 할 때 교착이 발생하지 않기 위해서는 2개의 교착버퍼가 필요하다. 다중 전송 지연 시간은 메시지 startup 지연시간에 좌우된다. 제안된 시스템은 단지 2번 이하의 메시지 startup 횟수를 가지며 이것은 기존의 어떤 다른 시스템보다 뛰어난 성능을 갖는다.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.43 no.12
• /
• pp.1089-1096
• /
• 2015

A marine helicopter should remain sufficiently upright to permit safe evacuation of all personnel with a flotation system. And the rule requires that after ditching in water, the adequate flotation time will allow the occupants to leave the rotorcraft. To this end, stability test of the emergency flotation system for Korean marine helicopter was performed by using "Froude scaling method" in water tank. Test configuration and conditions were determined in consideration of the helicopter loading condition and related specifications. Test results meet the stability requirements at sea state code 4 and sea state code 2 with puncture conditions.

• Journal of the Korea Institute of Building Construction
• /
• v.18 no.4
• /
• pp.363-373
• /
• 2018

Evacuation facilities are installed so that people can evacuate high-rise apartment houses when it is impossible to escape fire through the front door. The households of apartment houses may escape the building in two ways, which will reduce loss of lives. This study examined the characteristics of two-way evacuation facilities, including a light-weight partition wall, shelter space at the balcony and horizontally-installed indoor emergency exit. Then, it proposed a horizontally-installed outdoor emergency exit that improved the problems of the examined facility types, and analyzed its economic-feasibility. When a horizontally-installed emergency exit instead of a traditional type to escape from fire is used, people may be more autonomous in deciding whether active evacuation is possible or not. Thus, the time required to evacuate the building with 4 different evacuation methods using the stairs and horizontally-installed emergency exit was simulated in consideration of the impact of evacuation methods that people choose on the time required for evacuation using pathfinder. Then, the simulation results were compared and analyzed. Any appropriate evacuation method to reduce the time required for evacuation was predicted, analyzed and decided. As a result of this study, it was analyzed that the high - rise apartment top - down type evacuation zone can shorten the total evacuation time compared to the staircase type.

• Science of Emotion and Sensibility
• /
• v.23 no.3
• /
• pp.47-62
• /
• 2020

The snake detection theory posits that, due to competition with snakes, the primate visual system has been evolved to detect camouflaged snakes. Specifically, one of its hypotheses states that the subcortical visual pathway mainly consisting of koniocellular cells enables humans to automatically detect the threat of snakes without consuming mental resources. Here we tested the hypothesis by comparing human participants' responses to snakes with those to fearful faces and flowers. Participants viewed either original images or converted ones, which lacked the differences in color, luminance, contrast, and spatial frequency energies between categories. While participants in Experiment 1 produced valence and arousal ratings to each image, those in Experiment 2 detected target images in the breaking continuous flash suppression (bCFS) paradigm. As a result, visual factors influenced the responses to snakes most strongly. After minimizing visual differences, snakes were rated as being less negative and less arousing, and detected more slowly from suppression. In contrast, the images of the other categories were less affected by image conversion. In particular, fearful faces were rated as greater threats and detected more quickly than other categories. In addition, for snakes, changes in arousal ratings and those in bCFS response times were negatively correlated: Those snake images, the arousal ratings of which decreased, produced increased detection latency. These findings suggest that the influence of snakes on human responses to threat is limited relative to fearful faces, and that detection responses in bCFS share common processing mechanisms with conscious ratings. In conclusion, the current study calls into question the assumption that snake detection in humans is a product of unconscious subcortical visual processing.

• Korean Journal of Social Welfare
• /
• v.59 no.3
• /
• pp.147-174
• /
• 2007

This study examines how path dependency of working poor labor market segmented from the primary and the secondary labor market affects employment and quality of employment of working poor. It Further examines how path dependency makes working poor to remain in the labor market and makes it difficult for them to escape from a vicious poverty cycle. Data is based on the $3{\sim}7th$ Korea Labor and Income Panel Study(KLIPS). Markov's transition probability and discrete-time hazard analysis are used for analysis. This study finds that Korea labor market is divided into three parts; the primary labor market, the secondary labor market and the working poor labor market. The proportion of employed poor has been reduced, but the proportion of non economically-active working poor has been increased and has become the main group among the working poor. This shows that labor demand of working poor is fundamentally lacking and there are structural barriers that block working poor's employment itself. The regression analysis shows that the longer working poor labor market participation is, the lower poverty-exit rate. This is an evidence of vicious poverty cycle that the poor have little chance to exit from working poor labor market, once they step into it. Therefore, the longer their participation in poor labor market, the more likely they would move only within the closed working poor labor market. Consequently, it is necessary to fundamentally reform labor market structure and to alleviate negative perception and discrimination about the poor labor while activating labor demand.

• Journal of Radiation Protection and Research
• /
• v.24 no.1
• /
• pp.23-30
• /
• 1999

Pregnant ICR mice were treated with 137Cs gamma-ray / ultrasound on day 8 of gestation. In combined treatments, pregnant mice were treated with both 1.5 Gy of radiation and $1.0W/cm^2$ ultrasound at time intervals of -1, 0, 1, 3 and 6 hours. The mortalities and external malformations were investigated on day 18 of gestation. The threshold dose of mortality induced by radiation on day 8 of gestation was between 0.5 and 1.0 Gy, and that which was induced by ultrasound was between 1.0 and $1.5W/cm^2$. The mortalities in the late-stage of gestation induced by combined treatment with radiation and ultrasound increased synergistically. The threshold dose of exencephaly and anophthalmia induced by radiation were between 0.5 and 1.0 Gy and between 1.0 and 1.5 Gy, respectively. Those of exencephaly and anophthalmia induced by ultrasound were between 1.0 and $1.5W/cm^2$ and more than $1.5W/cm^2$, respectively. In combined treatments, the incidence of exencephaly and anophthalmia were found to increase synergistically. In the mice treated with both agents at a time interval of one hour, the incidence of exencephaly and anophthalmia reached maximum levels.

• Journal of Advanced Marine Engineering and Technology
• /
• v.38 no.3
• /
• pp.342-348
• /
• 2014

Onshore great fires can normally be extinguished by firefighters using special firefighting equipment and its suitable method. However, offshore fires on the ships are to be extinguished by the crew without any supports from the onshore. Also, crews working on board are exposed to high risk of emergency evacuation due to the complicated structure arrangement of the ships and different accident types such as fire and ship collisions. As most of damage and loss of life in fire are associated with suffocation, shortening of evacuation time is an important factor to improve a survival rate. In this study, visibility in the accommodation area is analyzed by using the temperature and smoke flow which are obtained by the Fire Dynamic Simulator(FDS) as a Three-Dimensional Fire Analysis program to understand the survival rate of the crew upon the fire. The fire doors for most of ships are designed to close automatically when the fire alarm is activated. These automatic closing of the fire doors is a very effective system to delay the spread of flame and smoke flow for the unmanned spaces of the fire protected area. However, if the crew cannot escape within the estimated time, the crew inside the fire protected area will be damaged a lot. In this paper, the comparative analysis between the evacuations by using the fire door from the fire protected area and the suggested fire shielding structure in this study is carried out by the smoke flow rate and the temperature rise rate.

• The Korean Nurse
• /
• v.26 no.1 s.139
• /
• pp.43-48
• /
• 1987

분만진행에 수직체위가 효과적이라는 것을 연구하는 연구자는 이러한 체위가 자궁수축력을 강화하고 분만시간을 단축하여 분만시 동통을 감소시킨다는 것을 파악했다. 분만과 출산 시 쪼그리고 앉는 방법이 역사적으로 오랜 기간 동안 적용되어 왔음에도 불구하고 연구자들은 여러가지 분만방법의 장점에 대한 연구가 부족한 실정이다. 임상 경험에 의해 쪼그리고 앉는 자세가 보다 효과적임을 알면서도 여러가지 위험을 우려하여 적용을 기피하고 있다. 그러나 연구자들은 앞으로 이러한 체위의 가치를 확인하고 특별히 다른 체위와 비교하여 쪼그리고 앉는 행위가 경관열상의 빈도, 분만 1,2기의 시간, 분만 중이나 분만 후의 뇨정체의 유무, 제대탈출의 빈도등이 어떠한지를 파악하여야 할 것이다. 쪼그리고 앉는 체위에 대한 가장 좋은 잇점을 얻기 위해 조산자는 이러한 체위를 언제 어떻게 할 것인가에 대한 지식을 가져야 한다. 또한 융통성있고 창조적인 접근방법을 시도하여 의학적수행과 분만시 사정을 용이하게 하고 산부와 의료요원이 보다 편안하도록 하여야 한다. 조산교육자나 조산자는 분만시 그들의 체위에 대한 교육을 포함하여 쪼그리고 앉은 방법의 효과적인 적용을 위해 노력해야 한다. 임부에게 안전, 편안함, 분만의 효과적인 진행, 모든 선택 가능한 체위들을 교육하고 그러한 체위 중 쪼그리고 앉는 방법을 선택하도록 격려해야 한다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2011.04a
• /
• pp.361-366
• /
• 2011

본 연구에서는 무인운영이 예정되어 있는 경량철도 지하역사 화재 시 안전대책을 강구하기 위하여 다양한 시나리오의 화재상황을 모사하여 FDS 사용코드를 이용해 화재유동현상을 분석하였다. 해석경계조건은 전동차 내부공간을 포함한 지하 3개 층과 설계에 반영된 환기설비를 적용하였으며, 약 500만 개의 격자를 34개 블록으로 나누어 계산하였다. 비상탈출 동선을 파악하여 주요 위치에서 피난경로상의 각 층 바닥으로 부터 1 m 높이의 한계온도와 연기층의 도달시간을 시나리오 별로 분석하여 보았다.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.38 no.2
• /
• pp.156-163
• /
• 2002

In order to development the construction and dimension of fishing gear for gizzard shad coastal purse seine, first of all investigated to the sinking speed and underwater geometry of net, behaviour of fish school to the net during the fishing operation In the field. The results obtained are summarized as follows; 1. Average sinking speed of net was 13cm/sec in bunt, 9.0cm/sec and 9.5cm/sec in 170m and 280m of center, 4.9cm/sec in end wing side, therefore was fastest in start of shooting and decreased gradually during the shooting process. 2. The most of leadline was reached in bottom from the shooting immediately to hauling time and the mean depth of timber bar used equipment for the escaping prevention of fish school was within the 2.7m. 3. The fish school of gizzard shad was appearanced higher density and remained to the most time in bottom than the surface and repeated to vortical movement, and its tendency to distinct in rapid time of tide current. 4. Behaviour of fish school in the net was showed to the vortical movement by sinking and rising immediately with the shooting of net and then divide with the two shape to follow round the wall of net and no patterns straightly movement in the net, and tendency easily catched in fish school of the wall of net. 5. Escaping of fish school in the gap of wing side was to busy after that seting the timber bar, therefore its function for escaping prevention of fish school was very lowed. 6. Escaping behaviour of fish school was differenced with the depth of fishing ground, the above 20m escaped to busy through the below in ledline because the sinking speed of fish school is fast than the net.