• 한국항해항만학회지
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• 제41권5호
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• pp.287-296
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• 2017

The Formal Safety Assessment (FSA) is a structured and systematic methodology developed by the IMO, aimed at assessing the risk of vessels and recommending the method to control intolerable risks, thereby enhancing maritime safety, including protection of life, health, the marine environment and property, by using risk analysis and cost-benefit assessment. While the FSA has mostly been applied to merchant vessels, it has rarely been applied to a DP vessel, which is one of the special purpose vessels in the offshore industry. Furthermore, most of the FSA has been conducted so far by using the Fault Tree Analysis tool, even though there are many other risk analysis tools. This study carried out the FSA for safe operation of DP vessels by using the Bayesian network, under which conditional probability was examined. This study determined the frequency and severity of DP LOP incidents reported to the IMCA from 2001 to 2010, and obtained the Risk Index by applying the Bayesian network. Then, the Risk Control Options (RCOs) were identified through an expert brainstorming and DP vessel simulations. This study recommends duplication of PRS, regardless of the DP class and PRS type and DP system specific training. Finally, this study verified that the Bayesian network and DP simulator can also serve as an effective tool for FSA implementation.

• 한국안전학회지
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• 제35권6호
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• pp.78-84
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• 2020

The F&EI technique is one of the risk assessments with many advantages. It can save time and effort compared to quantitative risk assessment (QRA). By using the evaluation result of this technique, it is possible to check the effectiveness of the investment cost. In addition, a relative risk ranking can be created and used to establish the facility management cycle and to prioritize investment. However, evaluating the target process can be evaluated more than the actual risk since the LCCF, a loss prevention measure, is too limited. In addition, calculating premiums via this method can result in excessive premiums, making it difficult to evaluate the risk precisely. Therefore, new safety guard was added to the LCCF of the F&EI risk assessment with reference to HAZOP and LOPA techniques. Newly added LCCFs are Deflagration arrester, Check valve, SIS, and Vacuum beaker, etc. As a case study, F&EI risk assessment was performed on Acetone storage tank of a API (Active pharmaceutical ingredient) plant to compare actual MPPD. The estimated loss amount was 592,558$ for the existing technique and 563,571$ for the improved technique, which was reduced by about 5% compared to the previous one.This proved that a more precise evaluation is possible and that the efforts for safety at the workplace are reflected in the evaluation results.

• 펄프종이기술
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• 제43권5호
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• pp.1-10
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• 2011

In this study, 13 water soluble polymers(6 natural polymer, 7 synthetic polymer) were treated on Hanji. Mechanical properties, morphology and oxidation index with thermal aging were measured on the aged Hanji, dewaxed Hanji and polymer treated Hanji. 3 natural polymer(such as CMC, EC, MC) and 3 synthetic polymers(such as PVA 1500, 2000, PEG 1500) treated Hanji had higher strength than other polymer treated Hanji. The oxidation index of 3% methyl cellulose solution treated Hanji did a little increase with thermal aging. Finally, methyl cellulose was found to be the most efficient method for strengthening the dewaxed Hanji. The best aging safety and thermal stability were obtained at the methyl cellulose 3% water solution.

• 펄프종이기술
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• 제44권1호
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• pp.1-9
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• 2012

In this study, 5 solvent soluble polymers were treated on Hanji. Mechanical properties, morphology and oxidation index with thermal aging were measured on the aged Hanji, dewaxed Hanji and polymer treated Hanji. Synthetic polymers(such as polylactic acid, polybutylene succinate, polystyrene) treated Hanji had higher strength and thermal stability than cellulose derivatives(such as cellulose nitrate and cellulose acetate) treated Hanji. Polymer treated Hanji showed a little bit of color change. The oxidation index of PS treated Hanji did not increase with thermal aging because it did not have a carboxyl group in chemical structure. Finally, polystyrene was found to be the most efficient method for strengthening the dewaxed Hanji. The best aging safety and thermal stability were obtained at the polystyrene 3% solution.

• 한국구조물진단유지관리공학회 논문집
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• 제8권3호
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• pp.251-261
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• 2004

최근에 교량구조물의 부식과 노회에 대한 관심이 모아지고 있는 상황에서 부식된 철근의 불확실성은 교량구조물의 안전성 뿐만 아니라 철근콘크리트 부재의 휨강도에 영향을 미치고 있다. 이 논문에서는 이들 불확실성을 고려한 신뢰성 뼈대구조물의 거동과 최적유지관리 시나리오에 대한 검증을 제시하고 있으며, 이들 과정은 부죄된 구조물의 생애주기를 고려한 프로그램에 의해 산출한 값이며 부식구조물의 신뢰성지수 프로파일에 의한 여러 형태의 구조물에 대한 영향을 고려하여 유지관리 효과에 대해 연구 하였다.

• Journal of Gastric Cancer
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• 제1권1호
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• pp.44-49
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• 2001

Purpose: Quality of life (QOL) assessment should be applied in surgical settings to compare treatment options. We compared QOL after a subtotal versus a total gastrectomy for gastric cancer to identify which resection would produce a better QOL for the patient. Patients and Methods: We studied 362 patients with no evidence of recurrent disease after curative surgery for gastric cancer. The QOL was measured by assessing patient health perceptions according to the Spitzer index and Troidl score and by treatment-specific symptoms according to Korenaga and others with some modifications. High scores reflect a better QOL. Results: The mean score of the Spitzer index was $8.87\pm1.36$ after a subtotal gastrectomy and $8.80\pm1.23$ after a total gastrectomy. More than $80\%$ of the patients in both groups maintained good quality of life when measured by the Spitzer index. The mean Troidl score was $10.41\pm2.12$ after a subtotal gastrectomy and $9.79\pm2.16$ after a total gastrectomy (p=0.033). Swallowing difficulty was more frequent after a total gastrectomy (p=0.002). There was a statistically significant difference in the meal size (p=0.044). Other variables of the Troidl score revealed no statistically significant differences. Dizziness was significantly more frequent after a total gastrectomy than after a subtotal gastrec tomy (p=0.009). Conclusion: We conclude that in terms of postoperative quality of life, a subtotal gastrectomy has advantages over a total gastrectomy. In those cases where an adequate proximal safety margin can be achieved by a subtotal gastrectomy, that procedure is preferable to a total gastrectomy.

• Safety and Health at Work
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• 제4권1호
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• pp.37-45
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• 2013

Objectives: As quality of work-life (QWL) among nurses affects both patient care and institutional standards, assessment regarding QWL for the profession is important. Work-related Quality of Life Scale (WRQOLS) is a reliable QWL assessment tool for the nursing profession. To develop a Chinese version of the WRQOLS-2 and to examine its psychometric properties as an instrument to assess QWL for the nursing profession in China. Methods: Forward and back translating procedures were used to develop the Chinese version of WRQOLS-2. Six nursing experts participated in content validity evaluation and 352 registered nurses (RNs) participated in the tests. After a two-week interval, 70 of the RNs were retested. Structural validity was examined by principal components analysis and the Cronbach's alphas calculated. The respective independent sample t-test and intra-class correlation coefficient were used to analyze known-group validity and test-retest reliability. Results: One item was rephrased for adaptation to Chinese organizational cultures. The content validity index of the scale was 0.98. Principal components analysis resulted in a seven-factor model, accounting for 62% of total variance, with Cronbach's alphas for subscales ranging from 0.71 to 0.88. Known-group validity was established in the assessment results of the participants in permanent employment vs. contract employment (t = 2.895, p < 0.01). Good test-retest reliability was observed (r = 0.88, p < 0.01). Conclusion: The translated Chinese version of the WRQOLS-2 has sufficient validity and reliability so that it can be used to evaluate the QWL among nurses in mainland China.

• 한국항해항만학회지
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• 제38권3호
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• pp.247-252
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• 2014

선박, 항해기술 발달과 더불어 안전에 대한 교육 및 법제 강화에도 불구하고 해양사고는 지속적으로 발생하여 큰 피해를 주고 있다. 사고가 발생하면 생명, 재산 그리고 환경적 재해가 수반하게 되므로 예방활동이 강조되고 그를 위한 정책적, 교육적, 법제적 노력에도 예방성과는 미흡한 실정이다. 본 논문에서는 예방활동의 동기와 성과를 촉진하고 체계적인 안전관리를 위한 시각적이고 정량적인 지수를 개발하여 선순환적인 예방문화를 구축하고자 선박사고 예방지수(PISA)와 예방수준(PLSA)을 개념화하고 정량화하였다. 선박사고 예방지수를 설계하기 위하여 지난 5년(2009~2013)간 국내에서 발생한 사고통계 자료를 4개 영역, 즉 교육, 기술, 단속, 정보영역으로 구조화하고 예방요소와 인자를 추출함으로써 지수를 정의하였다. 정의된 지수 산정에 필요한 평가모듈을 설계하였으며, 설계된 모듈을 이용하여 화물선, 여객선, 유조선, 예선, 어선을 대상으로 지수를 측정하였다. 측정된 선박사고 예방지수 결과를 통계적, 사례적으로 위험성(Risk)과의 상관관계를 분석하여 유용성을 확인하였다. 제안된 선박사고 예방지수를 인증제도 등에 활용함으로써 선박별 맞춤형 성과기반 예방활동은 물론 예방중심의 안전문화 촉진과 선박사고 저감효과가 기대된다.

• 아동학회지
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• 제33권1호
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• pp.183-203
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• 2012

While efforts to measure and monitor children's well-being have gained increasing recognition across the OECD, there has been relatively little research on the subject of indicators of children's well-being in Korea. This study was undertaken in order to develop the domains and indicators which can be used to measure the quality of life of Korean children from birth to age 17 and to put forward a possible well-being index for Korean children. The 35 indicators of well-being were grouped into eight domains and were designed for this study, using previous research on key child indicators for Korea and the child well-being index in foreign countries, such as the FCD-Land Index, Kids Count, the index of child well-bing in the European Union and OECD area. These domains are composed of the following : economic well-being, health, education, spiritual/emotional well-being, children's relationships, civic participation, safety/risk behavior, and housing and environment. The establishment of a Korean children's well-being index requires access to and use of national statistical data analyzed annually by the government as well as a general consensus regarding such issues as scope and its indicators.

• 대한토목학회논문집
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• 제26권6A호
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• pp.1023-1032
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• 2006

본 논문에서는 기존 교량 유지관리방법의 한계를 극복하고 예방유지관리 체계의 구현을 위하여 새로운 교량 유지관리기법을 제안하였다. 제안된 방법은 생애주기비용뿐만 아니라 생애주기성능을 함께 고려하여 열화되는 교량의 최적 유지관리전략을 수립할 수 있다. 교량의 성능변화는 신뢰성에 기초한 안전도와 상태등급을 세분화한 상태지수에 의해 평가되며, 생애주기 비용은 직접유지관리비용뿐만 아니라 도로이용자비용과 파손비용을 고려하여 추정하였다. 교량수명 동안의 성능 및 비용과 관련된 다중목적 조합 최적화 문제인 교량 유지관리 시나리오 집합의 생성을 위해 유전자알고리즘을 적용하였다. 개발된 방법을 실교량에 적용하여 유지관리전략 수립의 과정과 효과를 고찰하였다. 이러한 결과를 통해, 개발된 방법은 유지관리를 위한 의사결정과정에 효과적으로 활용될 수 있을 것으로 판단된다.