• 한국도로학회논문집
• /
• 제4권2호
• /
• pp.33-42
• /
• 2002

포장은 건조수축이나 온도변화 또는 차량의 반복하중 등으로 인하여 균열이 발생하게 된다. 발생된 균열 부위로 우수의 침입 및 비압축성 물질이 침투하여 하부층의 지지력 저하, 과다한 스폴링, 2차 균열 등의 파손이 발생하게 된다. 이런 문제점을 해소하기 위해서는 균열폭을 제한하여 관리해야하며 이것은 정확한 균열폭 감지를 필요로 한다. 현재의 측정방법은 공간적 시간적으로 많은 제약을 받는 현미경을 이용한 육안조사가 전부인 실정이다. 본 연구의 목적은 망원렌즈를 장착한 자동포장상태 조사장비를 사용하여 도로에서 주위차량과 비슷한 속도로 주행하면서 가장 정확한 균열폭을 감지할수 있는 조건을 찾는 것이다. 본 연구는 모의조사를 통하여 균열폭 크기에 따른 카메라 초점거리를 결정하고 망원렌즈를 부착한 카메라로 노면을 확대 촬영한 자료를 이미지프로세싱 프로그램인 STADI-2에서 여러 가지 factor를 사용하여 산출된 균열폭과 현장조사를 통하여 현미경으로 실측한 균열폭을 비교 분석한 결과, 이미지프로세싱을 이용한 최적균열폭 감지조건을 제시하였다. 연구결과 CRCP(연속철근콘크리트포장)에서는 카메라 초점거리 75mm를 사용하여 균열폭 0.5mm$\sim$1.2mm일때 정확도 80%이상으로 측정 가능했으며 아스팔트포장에서는 카메라 초점거리 12.5mm를 사용하여 균열폭 1.8mm$\sim$3.3mm에서 90%의 정확도로 균열폭을 감지할 수 있었다.

• 해양환경안전학회지
• /
• 제26권6호
• /
• pp.615-623
• /
• 2020

중대한 해양사고의 위험성을 사전에 인지하고 예방하기 위하여 준해양사고를 분석하는 것은 매우 중요하며, 이는 하인리히의 법칙을 이론적 배경으로 들 수 있다. 부산항 VTS의 관제구역에서는 2019.1.1. ~ 2019.12.31.까지 11건의 충돌사고가 발생하였으며, 같은 기간 24건의 VTS 관점 준해양사고가 보고되었다. 하인리히의 법칙에 따르면 보고된 24건 사례 이외에 더 많은 잠재적인 위험 상황이 있을 것으로 예상된다. 이에 본 연구에서는 선행 연구와 부산항VTS 관제사를 대상으로 한 설문조사 및 준해양사고 24건의 분석을 통해 VTS 관점 준해양사고 기준을 설정하였다. 이를 기준으로 잠재적인 위험 상황을 파악하기 위해서 3일간 교통조사를 실시하였다. 3일간 교통조사 실시 결과 216건의 잠재적 위험 상황을 확인했으며, 1년으로 환산하면 약 26,280건으로 분석된다. 설문조사를 통한 준해양사고 발생의 중요한 원인인 'VHF 통신 피드백 누락' 등의 조건이 반영되지 않았음을 감안하더라도 관제구역 내 많은 잠재적인 위험이 있는 것으로 보이며, 이를 통해 VTS 관점의 준해양사고 보고제도 강화에 대한 필요성을 검증하였다.

• 한국ITS학회 논문지
• /
• 제8권4호
• /
• pp.1-13
• /
• 2009

도로전광표지(VMS;Variable Message Sign)는 지능형교통시스템의 세부시스템중 하나로 도로이용자에게 실시간으로 교통정보를 제공하여 교통흐름을 원활하게 하는 기능을 가지고 있다. 그러나 현재 고속도로 구간의 VMS운영현황을 조사한 결과, 현시운영측면에서 메시지판독횟수가 정의되지 않아 적정현시운영에 어려움이 있으며, 정보제공측면에서 VMS 설치구간의 특성고려가 미흡하여 운전자의 혼란을 유발시키는 문제점이 드러났다. 세부적으로 문안표출시 글자체(Font), 표출전환방식, 정렬방식, 표출메시지 구성의 통일성이 결여되어 있고 불필요한 단어사용과 통일되지 않은 동일의미의 여러 용어를 사용하는 등 효과적인 정보전달체계에 개선이 필요한 것으로 분석되었다. 이에 본 연구는 VMS 운영관련지침 및 연구분석결과를 토대로 VMS 설치위치별 요구기능과 적정현시수의 정의 등의 효율적인 표출방안을 수립하였다. 세부표출방안으로 제공글자체, 메시지 전환방식, 정렬방식을 통일하였고, 운전자의 직관적인 메시지 판독이 가능하도록 상황별로 표출색상을 정의하였다. 본 연구에서 제시한 개선안의 평가를 위해 일반운전자들을 대상으로 기존안과 개선안의 선호도평가와 통계분석을 실시하였다.

• 해양환경안전학회지
• /
• 제23권3호
• /
• pp.250-257
• /
• 2017

This paper investigates minimum safe distances relative to a ship's four cardinal sides, as perceived by Filipino navigators when encountering dangerous elements and in adverse weather conditions when maneuvering in and around harbors. It uses a descriptive research method in the form of a questionnaire survey for experienced Filipino navigators of various ranks. During the course of research, 71 responses were colleted and the resulting data is presented in graphical and tabulated forms. Statistical methods including Pearson-product moment correlations, Cronbach's Alpha and ANOVA were used to identify internal associations, consistencies and significances, respectively. It has been proven that there are no significant differences in minimum safe distances relative to a ship's four cardinal sides, whether maneuvering while approaching a port or within an inner harbor. This study has been deemed significant for training future navigators, managing traffic in fairways, and designing harbors and maneuvering areas in the approaches to ports, among other applications. This work can also be used as a preliminary study for comparison with the well known safe domains presently in use.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2010년도 춘계학술대회
• /
• pp.169-170
• /
• 2010

울산항은 국내 다른 무역항에 비해 항계 및 정박지가 협소하고, 해상교통 흐름이 복잡하여 해양사고의 발생 개연성이 매우 높은 실정이다, 특히 울산 신항 개발에 따라 입 출항 선박량이 증가할 경우 정박지 부족 현상은 더욱 가중될 것이다. 본 연구에서는 울산항의 정박지 확충을 위해 불가피하게 요구되는 항계 확장 방안을 모색하여 제시하고자 한다. 해당 정박지 면적을 수용할 수 있는 항계 범위를 확정한 후 전문가 그룹에 의한 설문조사를 기초로 적정한 항계 확장 형태를 결정하였다.

• 한국IT서비스학회지
• /
• 제12권1호
• /
• pp.1-14
• /
• 2013

The government has implemented operating the bus information terminal (hereinafter, 'BIT') to use by building it at a major bus station to solve the problem of traffic congestion. Busan Metropolitan City has been continuously expanding the installation of 'BIT' since 2003. However, there are few research on the factor to use and satisfaction survey on 'BIT' from the perspective of the users. This study, in an effort to inquire into the 'BIT' utilization factor and its vitalization plan, conducted a face to face survey of 172 citizens who had the experience in the 'BIT'. The result of the data analysis showed that usability, convenience, and availability were the critical factors for a BIT use. In addition, the general intention to use 'BIT' was found to be very high as much as 90.7%. The contributions of this study are as follows. The academic contributions is that it proved the relationship between usability, convenience and the intention to use suggested by the information technology acceptance model is supported even in case of 'BIT.' For the practitioners this study provides ground data for a local government to make a plan of a BIT extension.

• 한국실내디자인학회논문집
• /
• 제22권3호
• /
• pp.33-42
• /
• 2013

The purpose of this study was to analyze the design trend of the vertical garden design in the indoor space through the examples of green wall in the lobby space. For the analysis, this study looks into the 'Guide for the Building Greening System' to understand the technical consideration for the green wall. After that, the key design elements was drawn from existing green walls through the literature review and field survey and field-survey. The study picked six green walls which was completed after 2000 in the lobby space in Seoul. The major findings of this study were as follows: First, the design factors mainly depend on the plant selection, which leads to the outlook and texture of the vertical walls. The texture is expressed by the two-dimensional or three-dimensional planting methods which is related to the selection of plant species. Second, the vertical walls in the lobby area should be planned for the function of space which could be transition, human traffic, mood and attraction. Third, the vertical wall should be integrated with the surroundings in order to reinforces the dynamic or static space experience.

• 한국도로학회논문집
• /
• 제17권6호
• /
• pp.117-126
• /
• 2015

PURPOSES : This study prioritizes potential technology for establishing a safe work zone environment on roadways. We consider almost all conceivable technologies that enable mitigation of unexpected accidents for both road workers and drivers. METHODS : This study suggests a methodology to set the priority of potential technology for establishing a safe work zone environment by using the analytical hierarchy process (AHP). For this purpose, the AHP structure was first developed. Thereafter, a web-based survey was conducted to collect experts' opinions. Based on the survey results, weights associated with the relevant criteria of the developed structure were estimated. With the consistency index (CI) and consistency ratio (CR), we verified the estimated weights. In addition, a sensitivity analysis was performed to confirm whether the estimated weights were reliable. We finally proposed the priority for potential technology for establishing a safe work zone environment on roadways. RESULTS : In the first level, safety technology has the highest priority, and real-time information delivery for work zone, hazard warning for drivers, and temporal automated operation for traffic facilities were selected in the second level of hierarchy. CONCLUSIONS : The results imply that establishing the priority will be useful to establish a future road map for improving the work environment for road workers and drivers by employing appropriate protection facilities and developing safety systems.

• 가족자원경영과 정책
• /
• 제11권1호
• /
• pp.65-81
• /
• 2007

The purpose of this study is to analyze income and consumption expenditure patterns over the family life cycle. The data used in this study is the 2004 Survey data from the Annual Report on the Family Income and Expenditure Survey data which are included salary and wage earners' households living in urban areas. The income and expenditure data of 20,383 households are analyzed. The family life cycle is classified into six stages and the items of expenditure are classified into 12 categories. The data are analyzed by descriptive statistics, $X^2$ test, F-test, and Duncan's multiple range test using SAS 8.0 package program. The major findings of this study are as fellows: First, the average monthly family income of the total sample is 3,480,000 won. The proportion of regular and irregular income among the total family income is 95.5% and 4.5% respectively. Second, the amount and ratio of monthly regular income fur each category are significantly different over the family life cycle. Third, the average monthly family expenditure of the total sample is 2,250,000 won. The amount and ratio of monthly expenditure of all items are significantly different over the family life cycle. The highest expenditure item is the traffic expanse and phone charge.

• 한국보건간호학회지
• /
• 제21권1호
• /
• pp.95-101
• /
• 2007

Purpose: The purpose of this study was to determine the incidence of unintentional-injury and to identify factors related to the high incidence of unintentional-injury in the community in order to provide useful data for the development of prevention and intervention programs aimed at reducing unintentional-injury incidence. Methods: This study utilized data obtained from cross-sectional national surveys conducted for the 2001 National Health and Nutrition Survey targeting 37,769 individuals aged between 0 and 99 years old, which was performed using a face-to-face interview method. Demographic characteristics, unintentional-injury experience, types of injury, and attributes of health behavior were included in the study instruments. Results: About 1.3% of the subjects had experienced unintentional injury that required hospitalization at least once during the past year. Age older than 40 years, male gender, lower education, lower income, and blue collar workers were all significantly and positively associated with increased risk of unintentional-injury. Among the health behavior variables, sleeping less than 6 hours, drunk driving, and binge drinking were significantly associated with unintentional injury, while traffic accidents and falls/slips constituted 80% of all unintentional injuries. Conclusion: Public health efforts to reduce unintentional injuries should target high-risk populations such as males, those with low income and education levels, and binge drinkers.