• 한국환경보건학회지
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• 제43권1호
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• pp.42-54
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• 2017

Objectives: The present study was conducted to investigate farm work environments among farmers and examine the level of management of safety and health, and to subsequently produce study result to serve as foundational data for the development of guidelines on safety and health as part of the improvement of farming work environments among farmers raising Korean native cattle. Methods: The present study conducted a survey on farm work environments and the management of safety and health with 407 farmers engaged in Korean native cattle farming in selected regions in eight provinces. It also visited 10 farmers to verify the current status of farm work. Results: The survey results showed that 16.4% of the respondents experienced safety-related accidents due to farm work. The locations of the accidents were inside the cattle shed (71.4%) and facilities outside the cattle shed (19.6%). The types of accident showed collision with animals (35.7%), collision or contact with obstacles (27.1%), and musculoskeletal accidents due to heavy object handling (12.9%). The causes of the accidents were cattle (38.3%), cultivators and tractors (25.4%), facility tools in cattle sheds (9.0%), and slippery floors (6.0%). The damaged areas were hand (21.0%), spine (19.8%), lower limb (18.5%), and foot (17.3%). A self-diagnostic survey on respiratory diseases showed that 11.5% of the respondents experienced respiratory-related symptoms. The survey on safety and health during farm work showed that wearing personal protective equipment and response to emergency situations, which were needed to prevent safety-related accidents, were relatively low compared to the level of recognition of the need and awareness of safety issues. Furthermore, the field survey identified the current status of safety and health issues such as prevention management of collision accidents with cattle, how to handle heavy objects, and wearing of personal protective equipment. Conclusions: The present study identified safety-related accidents and problems in the management of safety and health among Korean native cattle farmers. In order to address the problem, it is necessary to not only provide guidelines on safety and health management which are appropriate to the characteristics of Korean native cattle farming work, but also to study the development of personal protective equipment.

• 해양환경안전학회지
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• 제25권6호
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• pp.642-648
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• 2019

선박은 충돌방지를 위해 해상충돌예방규칙에 의해 운항한다. 하지만 다수의 선박이 동시에 운항하는 특수상황 시에는 해상충돌예방규칙을 적용하기 곤란하며 이때는 운항자의 개인능력에 의한다. 이러한 경우 해상교통관제를 통한 교통상황 관리가 필요하다. 이에 전 세계적으로 VTS(Vessel Traffic Services)를 통해 해상교통이 관리되고 있으며 운용 방법은 관제요원이 VTS 시스템을 이용하여 위험상황을 판단하고 통신시설을 이용하여 선박들에게 안전운항을 권고한다. 이 연구에서는 기존 방법에 AI(Artificial Intelligence) 기법을 추가하여 운항자의 관점에서 위험상황을 판단하는 방법에 대해 고찰한다. 또한, 관제 효율성 증대를 위해 AR(Augmented Reality)기법을 추가한 해상교통안전모니터링 시스템에 대해 설명한다. 이 시스템은 위험상황 및 위험 우선순위 예측이 정량적으로 가능하여 복잡한 교통상황시 실제 운항자가 충돌회피하는 방법과 동일한 순차적 위험상황 해소가 가능하다. 특히, 위험상황을 관제요원의 관점뿐만 아니라 각 선박의 운항자의 관점에서 분석할 수 있어 기존의 방법보다 실제적이다. 또한, 분석결과를 통해 정량적인 위험수역 파악이 가능하여 충돌회피를 위한 권고항로 지원이 가능하다. 결과적으로 이 시스템은 해상교통상황이 복잡한 해역에서의 선박간 충돌방지에 도움이 될 것이다. 특히, 해양분야 제4차 산업혁명에 주요한 분야를 차지하는 자율운항선박에 충돌방지 기능으로 사용될 수 있을 것이다.

• 대한조선학회 특별논문집
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• 대한조선학회 2017년도 특별논문집
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• pp.38-45
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• 2017

FPSO is widely used to develop deep sea oil fields and HHI has constructed ten(10) FPSOs. During these constructions, relevant structural design criteria such as yielding, buckling, fatigue, collision and impact strength were applied to verify structural safety. To apply the buckling strength evaluation for structures, the critical buckling stresses and applied stresses of relevant panels should be calculated. The plate and stiffened panels are to be idealized, which are needed much time and efforts by designers. Therefore, program development is necessary in order to evaluate the buckling strength conveniently and accurately. In this study, the buckling strength assessment system by using offshore code, DNV-RP-C201 was developed under MSC/PATRAN, pre-post program of finite element method. Graphic user interface program is written in MSC/PATRAN PCL functions. Source program to evaluate the buckling strength is developed in FORTRAN programming languages. The developed program is verified by comparing with the results of the Nauticus Hull developed by DNV Classification Society, and applied to the marine construction project conducted by Hyundai Heavy Industries LTD.

• 대한조선학회논문집
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• 제57권2호
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• pp.70-79
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• 2020

The offshore installation units may be subjected to various accidental loads such as collision from supply vessels, impact from dropped objects, blast load from gas explosion and thermal load from fire. This paper deals with the design and strength evaluation method of the stiffened plate structures in response to a blast load caused by a gas explosion accident. It is a comprehensive review of various items used in actual project such as the size and type of the explosive loads, general design procedure/concept and analysis method. The structural analyses using simple analysis methods based on SDOF model and nonlinear finite element analysis are applied to the particular FPSO project. Also validation studies on the design guidance given by simple analysis method based on SDOF model have also considered several items such as backpressure effects, material behavior and duration time of the overpressure. A good correlation between the prediction made by simple analysis method based on SDOF model and nonlinear finite element analysis can be generally obtained up to the elastic limit.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.678-679
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• 2015

Recently, safety accidents in construction sites are increasing. Accordingly, in this study, development of 'Big-Data Analysis Modeling' can collect articles from last 10 years which came from the Internet News and draw the cause of accidents that happening per season. In order to apply this study, Web Crawling Modeling that can collect 98% of desired information from the internet by using 'Xml', 'tm', "Rcurl' from the library of R, a statistical analysis program has been developed, and Datamining Model, which can draw useful information by using 'Principal Component Analysis' on the result of Work Frequency of 'Textmining.' Through Web Crawling Modeling, 7,384 out of 7,534 Internet News articles that have been posted from the past 10 years regarding "safety Accidents in construction sites", and recognized the characteristics of safety accidents that happening per season. The result showed that accidents caused by abnormal temperature and localized heavy rain, occurred frequently in spring and winter, and accidents caused by violation of safety regulations and breakdown of structures occurred frequently in spring and fall. Plus, the fact that accidents happening from collision of heavy equipment happens constantly every season was acknowledgeable. The result, which has been obtained from "Big-Data Analysis Modeling" corresponds with prior studies. Thus, the study is reliable and able to be applied to not only construction sites but also in the overall industry.

• 대한교통학회지
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• 제23권5호
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• pp.73-81
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• 2005

기존의 삼각교통섬은 일반적으로 우회전차로와 직진차로의 분리를 위하여 포장면 상단에 연석 등을 이용하여 돌출된 시설물을 사용한다. 그러나, 기존의 삼각교통섬을 좁은 차로의 교차로에 설치할 경우, 대형자동차가 좌회전시 대향 차로를 침범하여 대향 차로에 대기하는 자동차와 충돌할 가능성이 높다. 따라서 대향 차로를 분리하여, 대형자동차가 교차로 회전시 대향 차로를 침범하는 것을 방지해야 할 필요가 있다. 본 연구는 우리나라 여건에서 기존의 삼각교통섬만으로 이루어진 평면교차로와 물방울교통섬이 추가된 평면교차로를 비교하였다. 먼저, 안전성 측면에서 대형자동차의 회전궤적을 고려하여 물방울교통섬의 설치위치 및 형태를 결정하는 방법을 제시하였으며, 운전자 및 주행 쾌적성, 보행자, 확폭량, 경제성측면에서 물방울교통섬이 기존 삼각교통섬에 비해 상대적으로 우위에 있음을 분석하였다.

• 해양환경안전학회지
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• 제17권2호
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• pp.179-185
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• 2011

예인선 A호와 B호가 재킷을 실은 부선을 예인하기 위하여 진도 벽파항에서 출항하여 진도대교 부근 조력발전소 예정지로 운항 중 예인능력을 갑자기 상실하고 진도대교로 표류하여 바지선에 실려 있던 대형 철구조물인 일명 '재킷'이 제1진도대교 교각 및 중앙부 상판과 충돌한 사고가 발생하였다. 이 사고로 바지선에 살려 있던 조력 발전소 건설용 철구조물이 진도대교 중앙부 하단지점 바다로 추락했으며 제1진도대교 교각 1개가 일부 파손되고 상판의 바람막이도 세 군데가 구겨지는 등의 피해가 발생했다. 본 연구에서는 상기의 해양사고와 관련하여 부선의 운항경로가 갑자기 바뀌며 예인력을 상실하였던 해역의 시간대별 조류속도를 추정하고, 재킷을 실은 부선을 예인하기 위한 적정한 예인력을 산정함과 동시에 당시 기상 상황 하에서의 부선의 예인 안전성을 검토하고자 한다.

• 한국산업융합학회 논문집
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• 제21권4호
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• pp.167-174
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• 2018

Presently, the exploration of an unknown environment is an important task for the development of mobile robots and mobile robots are navigated by means of a number of methods, using navigating systems such as the sonar-sensing system or the visual-sensing system. To fully utilize the strengths of both the sonar and visual sensing systems, In mobile robotics, multi-sensor data fusion(MSDF) became useful method for navigation and collision avoiding. Moreover, their applicability for map building and navigation has exploited in recent years. In this paper, as the preliminary step for developing a multi-purpose autonomous carrier mobile robot to transport trolleys or heavy goods and serve as robotic nursing assistant in hospital wards. The aim of this paper is to present the use of multi-sensor data fusion such as ultrasonic sensor, IR sensor for mobile robot to navigate, and presents an experimental mobile robot designed to operate autonomously within indoor environments. Simulation results with a mobile robot will demonstrate the effectiveness of the discussed methods.

• Structural Monitoring and Maintenance
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• 제7권1호
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• pp.43-58
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• 2020

Pile foundations of existing bridges lie in soil and water environment for long term and endure relatively heavy vertical loads, thus prone to damages, especially after stricken by external forces, such as earthquake, collision, soil heap load and etc., and the piles may be injured to certain degrees as well. There is a relatively complete technical system for quality inspection of new bridge pile foundations without structures on the top. However, there is no mature technical standard in the engineering community for the non-destructive testing technology specific to the existing bridge pile foundations. The quality of bridge pile foundations has always been a major problem that plagues bridge maintenance. On the basis of many years' experiences in test engineering and theoretical studies, this study developed a new type of detection technology and equipment for the existing bridge piles.

• 한국통신학회논문지
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• 제29권11B
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• pp.974-979
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• 2004

IEEE 802.l1b에서는 기본서비스인 DCF와 QoS를 제공하기 위한 무경쟁 서비스인 PCF가 제공된다. DCF는 CSMA/CA(충돌을 회피하는 매체 접속 기법) 접속 프로토콜을 사용한다. 본 논문에서는 PCF를 수정하여 트래픽의 부하가 많아진 채널에 가충치를 두어 서비스하는 기법을 제시하였다. 스테이션 측으로부터 부분적인 큐의 정보를 받아 가중치를 계산하였으며 NS-2 시뮬레이터를 사용하여 PCF 기법을 수정한 기법의 우수성을 검증하였다.