• Journal of Internet Computing and Services
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• v.19 no.6
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• pp.133-145
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• 2018

Medical systems incurred accidents may result in significant damage for human being. Therefore, performing hazard analysis is important for medical system which is to identify hazard for preventing the accidents and minimizing the potential harm. Hazard analysis that is applied medical systems are difficult to apposite selected, because difference of analysis methods and applied development lifecycle is caused by objective of hazard analysis. It is required to select appropriate hazard analysis at concept phase during development lifecycle, owing to basic requirement elicitation to mitigate or prevent hazard based on identified hazard at concept phase. In this paper, hazard analysis methods, PHA and STPA, are compared at concept phase in which both methods have been applied on the medical system. As a result of compared methods, hazard analyst can be selected optimized hazard analysis methods for concept phase of the medical systems.

• Journal of the Society of Disaster Information
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• v.13 no.3
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• pp.376-387
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• 2017

The purpose of this study is to propose the methods for utilization and improvement of hazard map as a tool of risk communication, through the studying the importance and method of risk communication for the improvement of urban resilience. The comparative evaluation between hazard maps of Korea and Japan is done, and the cases of hazard map making is analyzed. 5 proposals are summarized for hazard map utilization.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.17-17
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• 2015

세계적으로 최근 국지적 호우에 의한 홍수 및 토사재해가 빈번히 발생하여 인적피해 및 자산피해가 급증하고 있다. 일반적으로 강우에 의해 홍수가 발생되며 하안 및 하천 구조물에 피해를 주는 동시에 월파 및 제방이 붕괴되어 하천에서 제내지로 범람하여 범람피해가 발생된다. 하지만 도시지역에서 발생되는 강우는 불투수 면적비율이 비교적 커 다른 지역보다 최대 침수심이 발생되는 시간이 매우 빠르게 도달하는 환경적 특징이 있다. 또한 선상지 지역에 발달된 도시는 어느 동일한 강우사상에 의해 발생되는 내 외수 범람재해 및 토사재해가 동시에 발생되어 피해가 중첩될 가능성이 매우 크며 피해 리스크 또한 증가하고 있는 추세이다. 따라서 이상기후에 의해 발생되는 재해경감을 위해 기존의 대책 및 새롭게 구축되는 해저드 맵에 대해서 이와 같은 여러 재해 발생 가능성을 충분히 고려된 멀티 해저드 맵 구축이 필요하다. 본 연구에서는 일본 오노시의 지역방재계획을 위한 통합적인 해저드 맵 구축을 위해 내 외수 범람에 의한 피해 및 토석류 발생에 의한 영향평가를 실시하여 두 재해가 동시에 발생 가능한 지역을 대상으로 멀티 해저드 맵 구축 및 피난계획 수립을 목적으로 최근 발생되는 국지적 호우에 대한 예측을 위해 아직 검토대상 지역에 발생하진 않았지만 발생 가능한 강우사상을 추출하기 위해 DAD 분석을 실시하여 가능최대강우량을 산정하여 외력조건으로 사용하였다. 뿐만 아니라 토석류 모델의 현장 적용성 평가를 위해 2011년에 발생된 우면산 토석류 재해를 대상으로 비교 검토를 실시하였으며 본 논문의 주요한 결과를 아래와 같이 나타내었다.

• Korea journal of population studies
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• v.35 no.2
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• pp.159-184
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• 2012

This study purports to analyze how individuals' labor market integration affect their transition to marriage. In doing so, I construct variables for job stability and continuity to represent labor market integration using labor force status and years of participation at the time of marriage and during the three years up to the point of marriage. In particular, I focus on differential effects of these labor market integration on the transition to marriage by cohorts: one for those who are likely to enter the labor market after the 1997 financial crisis and the other for those who are before the 1997 financial crisis. I used the Korean Labor and Income Panel Study and analyzed individuals aged above 18 in 2008. The main results are as follows. being currently employed and regular employment increases hazards of the first marriage for men but decreases them for women. long-term no-jobs decreases hazards of marriage for both women and men. long-term regular employment increases hazards of marriage for women but not for men at the statistically significant level. These effects vary by cohorts implying that recent economic and labor market instability deteriorated economic conditions for the youth making transitions to marriage.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.21 no.5
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• pp.133-148
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• 2022

In this study, a road pavement crack deterioration model was developed for a pavement road sections of the Sejong-city. Data required for model development were acquired using a deep learning-based road asset monitoring system. Road pavement monitoring was conducted on the same sections in 2021 and 2022. The developed model was analyzed by dividing it into a method for estimating the annual average amount of deterioration and a method based on Bayesian Markov Mixture Hazard model. As a result of the analysis, it was found that an analysis results similar to the crack deterioration model developed based on the data acquired from the Automatic pavement investigation equipmen was derived. The results of this study are expected to be used as basic data by local governments to establish road management plans.

• Korean Journal of Labor Studies
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• v.23 no.1
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• pp.197-220
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• 2017

This paper provides empirical evidence on the impact of increasing import penetration on the job stability of Korean workers. The main results are as follows. First, import penetration negatively affects job stability. If an industry's ratio of imports to total supply increases by 1 percentage point, the turnover probability of workers in that industry increases by 4.5 percentage points. Second, the effect of trade liberalization is not symmetric between imports and exports. Unlike the case of imports, an industry's ratio of exports to output does not have a significant effect on job stability. Third, the impact of import penetration is not uniform across different types of workers. The negative impact is greater for workers in small firms, less educated workers, and those not protected by labor unions.

• Journal of Labour Economics
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• v.29 no.2
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• pp.67-116
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• 2006

This study directly analyzes the wage distributions rather than indirectly looking at a few of their moments. It also investigates wage distributions using various descriptive and semi-parametric methods. The wage distributions of Korean manufacturing industries can in general be represented by three distinct forms, underdeveloped, advanced and the medium of the two. The discrepancies in these distribution forms are explained by differences in the labor-type distributions and their weights in the composition of wage distribution forms, and further clarified through various descriptive statistics based on them. However, the descriptive statistical analysis has a limit in that it shows mixed outcomes of different categoric variables. Then, this problem is resolved by applying a semi-parametric estimation of hazard function and the marginal effect evaluations of variable changes on estimated distributions not on the function. As a result of this marginal analysis, the common features and differences of categoric variables and their intensities of effects on distributions are revealed.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2015.10a
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• pp.187-189
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• 2015

해양사고를 야기하는 위기(risk) 또는 해저드(hazard)는 세계 경제 및 물류, 기상환경, 금융, 선종개발, 기술개발 등 다양한 요소에 의해서 수시로 변한다. 변한 위기에 대해서 사전에 대응방안을 수립하지 못한 경우 대규모 해양사고로 연계될 가능성이 크다. 그 이유는 대응방안을 사전에 고려하지 못했거나 준비하지 못한 해양사고는 사전대응책이 마련된 사고와 비교하여 대응하는 방법과 대응속도 등이 다르기 때문이다. 본 연구에서는 현재까지 새로 창출된 다양한 위기를 각종 보고서, 논문 등을 통해서 식별하고 분류하여 현재까지 식별하지 못한 위기를 구분하고, 식별하였더라도 새로운 사고를 유발한 위기를 식별하여 사전에 예방책을 강구하는 것이 목적이다. 연구 대상이 방대하기 때문에 본 연구에서는 일단, 알리안츠 보험회사 자료에서 획득한 위기분석 결과를 토대로 위기를 식별하고, 이에 대한 시나리오를 전개하였다. 이를 통해서 추후 연구방법을 검토하고자 한다.

• Journal of Korean Society of Transportation
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• v.30 no.3
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• pp.71-82
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• 2012

This study analyzed factors affecting daily travel times at each stage of commuters' life cycle. In this study, travel times were dealt with in the context of trip chain. That is, the travel time was defined as the total amount of time commuters had spent to move for daily activities from leaving to coming back home. A commuter's life cycle was divided into 6 stages on a basis of both householder's age and family type: i.e., the unmarried youth period, the family forming period, the children education period, the children youth period, the children independence period, and the aged period. Variables such as commuting times, home-based trip cycle recurrences, and the number of stops differed for each stage of life cycle, the latter of which represents how many places a commuter dropped by during a trip cycle. Several factors were found to affect commuting times at each stage of life cycle as a result of applying a Cox proportional hazard model. The empirical study was conducted using 2010' household travel survey data collected from Gyeonggi-do.

• Journal of Labour Economics
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• v.33 no.1
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• pp.31-52
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• 2010

Internal labor market in a firm is normally designed to solve the adverse-selection problem as well as the moral hazard problem in the world of information asymmetry. The internal labor market of a Korean university as a non-profit organization should have the same function as the firm. The purpose of this paper is to evaluate the economic performances of a university's internal labor market, using confidential data. And I suggest how to improve the performances of a Korean university's interal labor market. Specifically, I suggest incentive pay for university professors. I also suggest eight job classification and job-related pay system for staffs and secretaries to enhance the efficiency of the university's internal labor market.