철도건널목에세 위험평가 접근기법

정성학,왕종배,홍선호 대한안전경영과학회 2003 대한안전경영과학회 학술대회논문집 Vol.2003 No.1

철도건널목에세 위험평가 접근기법

정성학,왕종배,홍선호 대한안전경영과학회 2003 대한안전경영과학회 학술대회논문집 Vol.2003 No.11

The objectives of this study is to achieved by the use of the conceptual approach and accident data bases to develop statistical accident analysis, effectiveness values, comparison analysis of statistical models to determine which variables are significantly related to accidents, human factor, and hazard factor analysis, all of which were used in the railroad crossing. The result from this approach applicable to the railroad crossing where systematic safety management criteria have been considered.

인력물자취급시의 인체심리학적 최대허용중량의 생리학적 고찰

정성학,김홍기,Jeong, Seong-Hak,Kim, Hong-Gi 대한인간공학회 1999 大韓人間工學會誌 Vol.18 No.1

The objective of this study was to investigate the metabolic energy consumption rate of the psychophysical Maximum Acceptable Weight of Loads (MAWLs) for different manual materials handling tasks. Lifting activities with four different lifting frequencies (2, 5, 8, 11 lifts/min) for a lifting range (from floor to 76cm height) were studied. The oxygen consumption rate and heart rate were measured or recorded while subjects were lifting their MAWLs. It was found that the relationship between MAWL and frequency can be described best by the exponential function with the R-sq value 0.9865 for this study. Psychophysical MAWL decreased from 22.38 to 7.48 kg, while the oxygen consumption rate with the MAWL increased from 717.8 to $1114.7m{\ell}-O_2/min$ as the frequency increased from 2 to 11 lifts/min. Heart rate also increased from 104.5 to 120.7 bpm. The ratio of oxygen consumption for the MAWL to the Physical Work Capacity (PWC) ranged from 28 to 43%. The MAWLs were greater than or equal to the Maximum Permissible Limits (MPLs) when the frequencies were higher than 8 lifts/min. It seems that the MAWLs by psychophysical approach when the frequencies were higher than 8 lifts/min tend to be overestimated from the viewpoint of the physiological criterion of the oxygen consumption rates. From these findings it is suggested that the NIOSH Guideline should not be directly applied to Korean without reasonable modifications.

조선후기 공생(貢生)의 의미와 공생층 증가양상

정성학 한국역사연구회 2019 역사와 현실 Vol.- No.111

The goal of this article is to determine the nature of the Gongsaeng(貢生) figures of the Joseon dynasty and why the number of them increased in the Joseon period’s latter half, according to census registers. To that end, various references to these figures inside historical texts are analyzed here, while genealogy records of certain Gongsaeng figures identified from the Daegu region’s census register records are also examined. The Gongsaeng of Joseon refers to descendants of Hyang’ri(鄕吏) clerks who did not take on the same obligations (“Hyang’yeok, 鄕役”) as their ancestors. In Joseon, most of the Hyang’ri clerks inherited that very obligation as ‘task of the family,’ but of course there were some exceptions. Not all of the Hyang’ri descendants were able to assume the same task, as there was a predesignated number of Hyang’ri clerks (“I’aek, 吏額”) allowed in the region to serve the task for a lifetime. So naturally there had to be Hyang’ri descendants without the Hyang’ri task, and the choices such figures made afterwards determined their future paths. Ultimately they diverged into two groups: individuals who tried to apply and successfully pass the civil exam at the capital city and follow the lifestyle of Sajok figures, and people who remained at the center of their local hometowns as well as on the list of Hyang’ri candidates, hoping to become one themselves in the future. The term Gongsaeng would refer to individuals in both groups. According to the Daegu-bu units census register, the number of Gongsaeng figures rapidly increased in the late 18th century. Some of them were able to become Hyang’ri clerks, but the rest of them had to spend their lives as Gongsaeng figures. Interestingly, although some Gongsaeng figures could never become Hyang’ri clerks, a 19th century social phenomenon of people illegally calling themselves ‘Yuhak scholars’ was never to be found in the aforementioned Daegu region records.

A Discussion of the Two Alternative Methods for Quantifying Changes : by Pixel Values Versus by Thematic Categories

정성학,Choung, Song-Hak The Korean Society for Geospatial Information Syst 1993 대한공간정보학회지 Vol.1 No.1

여러 분야에 있어서 원격탐사의 탐지 및 모니터링 기능과 지리정보시스템의 이성적 접근 및 분석기능을 접목함으로써 이에 의한 많은 효과를 얻고 있다. 원격탐사기술 및 지리정보시스템을 접목하는 데에 있어서 핵심적인 응용분야로는 변화를 분석하는 것이 있다. 이러한 변화가 그 자체로 관심의 대상이 되거나, 또는 이로 말미암아 우리는 (지도를 개정하는 등의) 행동을 취하게 되기 때문에 원격탐사는 변화를 탐지하는 데에 있어서 훌륭한 도구가 된다. 지리정보시스템 또한 변화의 과정을 정량화 하는 최상의 분석도구가 될 수 있다. 이러한 변화를 정량화 하는 데에는 두 가지 방법이 있다. 개념적으로 간단한 방법으로는 각 이미지의 적셀 값을 비판하는 것이 있다. 이 방법은 실질적인 반면 (적용이) 단순하여 복잡한 (자연) 환경에서의 다양한 변화를 분석할 수는 없다. 이에 대한 또 다른 방법으로는 기호변화탐지가 있다. 분석자는 먼저 판별하고자 하는 중요한 분류항목들을 결정한다 이 방법은 토지리용 및 피복도가 정확하게 구분이 된 다음에야 효과적일 수가 있다. 디지탈 변화탐지를 수행하고자 하는 사람은 조사대상지역의 환경, 데이타 세트의 질 그리고 변화탐지 알고리즘 등에 대해서 잘 알고 있어야 한다. 또한, 특정지역 및 (추진하고자하는) 과제에 적합한 변화탐지 알고리즘을 파악하는 작업을 수행해야 한다. In a number of areas, there are important benefits to be gained when we bring both the detection and monitoring abilities of remote sensing as well as the philosophical approach and analytic capabilities of a geographic information system to bear on a problem. A key area in the joint applications of remote sensing technology and GIS is to identify change. Whether this change is of interest for its own sake, or because the change causes us to act (for example, to update a map), remote sensing provides an excellent suite of tools for detecting change. At the same time, a GIS is perhaps the best analytic toot for quantifying the process of change. There are two alternative methods for quantifying changes. The conceptually simple approach is to un the pixel values in each of the images. This method is practical but may be too simple to identify the variety of changes in a complex scene. The common alternative is called symbolic change detection. The analyst first decides on a set of thematic categories that are important to distinguish for the application. This approach is useful only if accurate landuse/cover classifications can be obtained. Persons conducting digital change detection must be intimately familiar with the environment under study, the quality of the data set and the characteristics of change detection algorithms. Also, much work remains to identify optimum change detection algorithms for specific geographic areas and problems.

ITS 업무요령 및 성능평가 제도 개선방안의 정책 연구

정성학,윤여환 한국ITS학회 2009 한국ITS학회논문지 Vol.8 No.6

본 연구의 목적은 ITS 업무요령 및 ITS 성능평가 제도 개선을 위한 법․규정의 개정을 제안한다. 본 연구는 ITS 업무요령 및 ITS 성능평가 제도의 현황과 문제점을 분석하고 개선방안을 제시함으로써 신뢰성 있는 교통정보를 제공하고, 제도 개선을 통하여 민원 발생의 우려를 줄이며, 사회적 비용도 감소시키게 된다. 또한, ITS 장비와 센터의 유지관리 기준과 ITS 성능평가 업무의 직무분석을 통한 업무분담 체계화, ITS 성능평가기관의 역할 정립과 기술위원회의 기능을 정립하여 ITS 성능평가 제도 개선 하에서 생산되는 교통 자료의 신뢰성이 높아지고 새로운 차원의 서비스를 도출할 수 있어서 ITS 시스템의 효율성 증대 및 투자 효과의 극대화를 제공할 것이다. The objective of this study is to revise the related regulations and laws of intelligent transport systems performance tests and methods. This study improves the reliability of present traffic information, reduce public discontent by systematic reforms and reduce national and social costs through the analysis of intelligent transport system performance tests’current status and problems. This study will maximize the investment profits and efficiency of ITS system as the reliability of transportation information which is created through the maintenance of ITS equipment and center, systemization of work responsibility through close analysis of ITS performance test and overall evaluation of role of ITS performance assessment organization will improve and new level of service will be born.

저소득층의 방송이용 특성과 지원정책에 관한 연구 - 차상위 계층을 중심으로

정성학,강경수,유승관 한국정치커뮤니케이션학회 2013 정치커뮤니케이션 연구 Vol. No.

This study explored behaviors and problems of the secondary poor,using survey and policy analysis. As a result, the fact that the secondary poor among a lower income class significantly depend on mass media than any other group, was reaffirmed. They use traditional mass media,for example, TV, as an almost utmost medium in terms of source for information gathering, social interaction and education. They recognized television as a vital medium in providing various, reliable, everyday life and learning information. Also, factors such as information function affected more significantly to their satisfaction than those of criticism and surveillance to the secondary poor. However, they are generally dissatisfied with having to burden subscription fee to pay TV as well as KBS,indecent language use, and homogeneous entertainment programs which do not care them much. As for policy aspects, this study suggested more economic aids should be necessary to bridge the gap with others, especially considering their poor economic condition. Also, viewer-friendly remote control device,media education and public relation should be accompanied. Moreover, this study emphasized TV programs, which mesh with the taste of the secondary poor, are much more needed and they should be reflected as equal in mass media as well. 본 연구는 디지털 융합 환경에서 방송소외계층의 하나인 저소득층 중 차상위 계층이방송서비스를 어떻게 이용하고 있는지를 설문조사를 중심으로 분석함으로써 방송소외를 최소화할 수 있는 정책방안을 모색했다. 연구결과, 차상위계층은 방송미디어를 거의 유일한 정보획득 및 사회화와 교육 매체의 수단으로 이용하고 있음을 보여주고 있어 이들에게 TV매체의 영향력이 타 매체보다는 상대적으로 매우 크다는 점을 알 수 있었다. 또한 방송에 대한 전반적인 태도를 보면다양한 소식 전달, 믿을만한 정보 제공, 생활/학업 필요 정보 제공이 기타 항목보다 상대적으로 높았고, 방송에 대한 전반적인 태도가 만족도에 영향을 미치는 평가요인에 있어서도 사실적 정보전달 기능이 비판/고발 정보전달 기능과 믿을만한 정보전달 보다 중요한 영향을 미치는 것으로 나타났다. 차상위계층의 방송에 대한 불만족 요인으로 특히KBS 수신료와 유료방송 수신료 이중부담 문제에 대해 가장 심각하게 평가하고 있고,출연자의 비속어/외래어 사용 잦음, 프로그램 내용의 유사성에 대해 문제를 제기하고있었다. 차상위계층을 포함한 저소득층은 경제적인 어려움이 제일 크기 때문에 지원을 더욱늘려야 하고, 노인들과 저학력층 등에서 리모콘 조작과 프로그램 이해 등의 능력이 떨어지는 경우가 많으므로 방송 미디어 활용 교육과 홍보 등이 필요하며 노인층과 중장년층을 위한 프로그램의 편성 비중을 늘려야 한다. 또한 방송 프로그램 내용에서 소외 계층을 배려하고, 일반인들과 동등하게 묘사하고 인식시키고, 사회적 통합을 위해서 프로그램의 기획과 제작에서부터 고려해야 한다.

지방선거와 미디어의 역할 : 트위터를 중심으로

정성학 한국정치커뮤니케이션학회 2010 한국정치커뮤니케이션학회 학술대회논문집 Vol.2010 No.1

인력물자취급시 작업빈도에 따른 생리적 작업능력의 연구

정성학,김홍기,Jeong, Seong-Hak,Kim, Hong-Gi 대한인간공학회 1999 大韓人間工學會誌 Vol.18 No.2

The objective of this study was to make comparison of the physical work capacities(PWCs) for three different types of tasks. For this purpose, an ergometer exercise, a treadmill exercise, and lifting activities with four different frequencies (2, 5, 8, 11 lifts/min) for the lifting range from floor to 76cm were considered. Oxygen consumption rates and heart rates were measured during the exercises and lifting activities. The PWC values for ergometer exercise test was $2562.71ml-O_2/min$ and the one for treadmill exercise was $2874.89ml-O_2/min$. The value of lifting PWC increased from $1774.07ml-O_2/min$ to $2296.76ml-O_2/min$ as the lifting frequency increased from 2 to 11 lifts/min. The ratio of the lifting PWCs to the ergometer PWC increased from 69.36% to 89.77% as the lifting frequency increased. To the treadmill PWC, the ratio increased from 62.21% to 85.24% as the lifting frequency increased. From this result, it appears that the PWCs based on the lifting tasks rather than PWCs by ergometer or treadmill exercise should be considered to determine the physiological criterion for safe weights for lifting tasks. Therefore, the physiological criteria of the NIOSH Guideline should be reexamined.

주행경제를 위한 드라이빙 시뮬레이터 모듈 연구

정성학 대한안전경영과학회 2008 대한안전경영과학회 학술대회논문집 Vol.2008 No.11

The aim of this study is to propose economical safety driving speed index which those are geometric road status; examine the levels of which those cost-benefit of driving fuel expenditure; are search road safety design and operational technology for driving simulators. For the objective, we analyzed the current status of driving fuel expenditure and driving scenarios by the road alignments, and reviewed driving and technical specifications by the geometric types of road according to the implementation, and extended completion. Throughout the result of this study, diverse related driving information provision service, efficiently driving system is expected to be implemented in the national highway design system.