• Journal of Digital Convergence
• /
• v.14 no.8
• /
• pp.269-276
• /
• 2016

Public Safty-LTE(Long Term Evolution) is being deployed in the direction of reducing cost by using both of municipal network and commercial network. However, LTE Network is difficult to ensure the survivability during the information communication infrastructure failures. In addition, it is vulnerable in communication coverage of inside buildings and underground. In this study, we propose to implement effectively the network survivability technique through the convergence to the proven technology. As the advent of the IoT Age, smart sensors which are embedded in the environment and the things will be able to provide a useful infrastructure for ensuring the network survivability. Based on the feature of the smart sensor, we designed the sink node architecture to guarantee the network survivability in disaster situation through the convergence of the small cell technology and extension of wireless network coverage technology. The computing power inherent in the environment is a valuable resource that can be utilized in the disaster situation.

• Journal of the Korea Society for Simulation
• /
• v.30 no.1
• /
• pp.1-9
• /
• 2021

In actual battlefield environment, the naval ships which have specific missions have to respond to the attack of hostile forces. Especially, in modern warfare, the importance of the survivability of naval ships are increasing due to the high lethality of armaments. Naval ship survivability is generally considered to encompass three constituents, susceptibility, vulnerability and recoverability. Recently, among these three constituents, many researches on vulnerability have been conducted. However, for the vulnerability of naval ships, most of researches are aimed towards the detailed design stages where implementing changes is heavily constrained or even impractical. In this paper, vulnerability assessment model for naval ships on a theater engagement is developed by using M&S technique. By using this model, the characteristics of platform and armaments are reflected on the damage of naval ship. The basic logic of damage assessment is also considered in detail. The damage status of the naval ship is quantified by defining a representative state index of onboard equipment for each system.

• Proceedings of the Korean Society of Applied Pharmacology
• /
• 1993.04a
• /
• pp.36-36
• /
• 1993

DA-125의 분광학적, 물리화학적, 물리적 특성을 규명하고 HPLC 및 Bioassay에 의한 정량법을 개발하였다. DA-125는 용액중에서 pH의존적 안정성을 나타내었으며, 원말의 안정성은 상대습도에 의한 영향을 크게 받았다. DA-125의 합성수율은 약 10％ 향상되었으며, 연구용 시료는 약 72g을 합성하였다. DA-125는 ADM 내성암주에 대해서도 상대적으로 매우 강한 세포독성을 나타냈으며, in vivo애서도 ADM보다 우수한 종양성장억제율과 연명율을 나타내었고 특히 장기생존수에서 ADM 투여군에서는 생존예가 없는 반면 DA-125 투여군에서는 7/8이 생존하는 우수한 결과를 나타냈다. DA-125의 일반약리작용은 ADM과 유사하였으나 작용은 보다 경미하였다.

• Proceedings of the Korean Society of Fisheries Technology Conference
• /
• 2001.05a
• /
• pp.81-82
• /
• 2001

최근 세계는 각종 어로기기 및 어구어법 기술의 발달로 인한 자원남획에 대한 우려로 자원관리형 어업에 대해 새로운 인식을 하게 되었고, 남획문제를 해결하기 위한 다각도의 노력을 기울이고 있다. 그러나 우리 나라 연근해에서 조업하고 있는 대표적인 어업인 트롤어업은 타 어구에 비하여 어획성능이 매우 우수하여 자원남획의 소지가 많고, 다이아몬드형 망지의 구조적 특성으로 인해 소형어류의 탈출이 어렵고, 탈출한 어류도 탈출시의 어체손상으로 생존율이 극히 저조할 것으로 추정되어 자원관리의 주 대상 어업으로 등장하고 있는 실정이다. (중략)

• Proceedings of the Korean Society of Disaster Information Conference
• /
• 2023.11a
• /
• pp.43-44
• /
• 2023

항공기 사고시에 탑승객의 생존성을 제고하기 위한 방법으로 충돌/충격 전, 충격방지자세 Brace Position를 취하도록 하는 것이 전 세계 항공사의 공통적인 안전 매뉴얼이다. 해당 매뉴얼은 1980년대 미국 NTSB에서 항공기 사고를 조사하면서 생존 특성을 연구한 이후 처음 정형화 되었고 이후 현재까지 일반적으로 적용되고 있다. 그러나 허드슨강의 기적으로 불리는 2009년 1월 15일 US Airways 1549편의 비상착수 사고에서 항공기의 큰 구조적인 손상이 없었음에도 불구하고 탑승객 일부가 중상을 입는 결과를 초래하여 이를 계기로 기존의 충격방지자세 적절성을 재검토하여 개선하는 움직임이 있었다. 이에 관련 연구자료를 분석하여 국내 적용 방안을 살피고 또한 추가적인 개선방안을 제시하고자 한다.

• The Journal of Korean Academy of Prosthodontics
• /
• v.48 no.1
• /
• pp.28-40
• /
• 2010

Purpose: The aim of this retrospective study was to provide long-term data about the correlation between multifactorial local factors and the survival of implants. Material and methods: During 19 years (1991 to 2009), 2796 implants were placed in 879 patients. From dental charts and radiographs, the following data were collected: patient's age at implant placement, gender, implant system, surface, length, diameter, location of implant placement, bone quality, primary stability, type of prosthesis. The correlations between these data and implant survival were analyzed. Statistical analysis was performed using Kaplan-Meier survival analysis, Chi-square test, odds ratio. Results: 1. Among the 2796 implants, 150 implants failed that resulted in a cumulative survival rate of 94.64%. The cumulative survival rate of smooth surface implants (91.76%) was lower than rough surface implants (96.02%). 2. Anatomic location, implant surface, diameter of smooth surface implant, primary stability, type of prosthesis, patient's age and gender were significantly associated with implant survival (P < .05). 3. No significant difference in implant survival was found in relation to the following factors: implant length, bone quality, diameter of rough surface implants and type of rough surface according to implant manufacturer (P < .05). Conclusions: Local factors such as anatomic location, implant surface, diameter of smooth surface implant, primary stability and type of prosthesis have a significant effect on implant survival.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.39 no.2
• /
• pp.87-91
• /
• 2003

Experimental fishing was carried out to investigate the survival rate of fishes discarded after hauling from the trawl and to develop the fishing gear and method for fisheries management which can improve the survival rate of young fishes escaped from the trawl codend in offshore korean southern sea and off Cheju Island of Korea. The young fishes were bred in fish cage on the board to measure the sustainable survival time for fishes escaped from grid panel and codend. The obtained results are summarized as follows' 1. Japanese flying squid(Todarodes pacjficus), mitra squid(Loligo chinesis), hair-tail( Trichiurus lepturus), john dory(Zeus japonicus), spanish mackerel(Scomberomorus niphonius), redlip croaker (Pseudosciaena polyactis) and blackthroat seaperch(Doederliinia berycoides) were dead instantly after hauling. 2. Survival rate of tiger shark(Galeocerdo cuvier), conger eel (Conger myriaster), red skate (Dasyatis akajei), black scraper(Navodon modestus) and japanese fan lobster(Ibacus ciliatus) might be high after discarding because they survived for long hours in fish cage. 3. Blotched eelpout(Zoarces gili) escaped from the escapement device(grid) was dead within 6 hours in the water tank installed on the board but 97% of tiger shark and 72% of conger eel survived over 72 hours. 4. Red skate escaped from trawl codend was dead within 60 hours in the water tank installed on the board but sustainable survival time of 25% of octopus(Paroctopus dofleini) and 100% of black scraper was over 72 hours. 5. Compared with the survival rate of rosefish(Helicolenus higendorfi) escaped from the escapement device(grid) and trawl codend, all of the rosefish escaped from the grid was dead within 7.2 hours but 8.3% of the rosefish escaped from the codend survived over 72 hours. 6. In comparison with the survival rate of japanese fan lobster survived over 72 hours, survival rate of japanese fan lobster escaped the codend was much higher as 75% than 33% of japanese fan lobster escaped from the grid.

• Journal of the Korean Society of Propulsion Engineers
• /
• v.16 no.5
• /
• pp.58-66
• /
• 2012

The IR signature and radiative base heating from an aircraft plume have been important factors for aircraft survivability in modern battle fields. In order to enhance the aircraft survivability and reduce the base heating, infrared signatures emitted from an aircraft exhaust plume should be determined. In this work, therefore, IR signatures and radiative base heating characteristics are examined in the plume exhausted from the aircraft with operating at altitude of 5 km in M=0.9 and 1.6, respectively. As a result, it is found that the particular wavelength IR signature has high spectral characteristics because of $H_2O$ and $CO_2$ gases in the plume, and the radiative heat flux coming into the base plane increases with higher Mach number and shorter distance.

• Korean Journal of Family Social Work
• /
• no.54
• /
• pp.225-262
• /
• 2016

This article reports on the analysis of the patterns and frequency of recurrences of substantiated instances of maltreatment in the Child Protective System (CPS). The data was collected from 2012 to 2014 by the CPS. Five-thousand-five-hundred-forty-two cases were substantiated in 2012 and then 323 cases were exposed recurrence during that time. Most recurrence families experienced only one recurrence. Results from survival analyses instances indicated that risk of recurrence was greatest during the first one month following a report. The prior CPS report, multiple type of abuse, physical abuse, and services type was linked the pattern of recurrence of maltreatment. Also, victim's age and the number of problematic behavior, perpetrator's stress and social isolation, intra family member as perpetrator, prior CPS report, and the number of reports was linked recurrence.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2012.05a
• /
• pp.282-289
• /
• 2012

The IR Signature and radiative base heating from an aircraft plume have been important factors for aircraft survivability in modern battle fields. In order to enhance the aircraft survivability and reduce the base heating, infrared signatures emitted from an aircraft exhaust plume should be determined. In this work, therefore, IR signatures and radiative base heating characteristics are examined in the plume exhausted from the aircraft with operating at altitude of 5km in M=0.9 and 1.6, respectively. As a result, it is found that the particular wavelength IR signature has high spectral characteristics because of $H_2O$ and $CO_2$ gases in the plume, and the radiative heat flux coming into the base plane increases with higher Mach number and shorter distance.