• 한국안전학회지
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• 제30권6호
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• pp.26-33
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• 2015

This study suggests systematic procedures to improve safety policies on prevention of industrial accidents associated with industrial machines and devices. Specifically, new method of cause analysis of industrial accidents associated with industrial machines and devices is suggested and the related accident data are re-analyzed. Effectiveness of direct safety regulations such as safety certification, self-declaration of conformity, safety device regulation and safety inspection of industrial machines and devices are also analyzed. Based on those analysis results, transition from the current user-oriented safety device regulation to more balanced direct regulations on both manufacturer and user is suggested. Together with severity and frequency of industrial accidents, unit severity and unit frequency need to be taken into account to further assess the risk associated with a particular industrial machine or device. Balance between safety regulations will be realized by proper adjustment of lists of safety certification and inspection, and certification and inspection standards. This will also guarantee the maximum benefit over cost in such safety regulations.

• 한국산학기술학회논문지
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• 제14권11호
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• pp.5541-5548
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• 2013

서비스의 속성상 어떠한 기업도 서비스 실패로부터 자유로울 수 없다. 때문에 이러한 서비스 실패를 적절하게 회복하기 위한 노력은 무엇보다 중요한 의미를 가지게 된다. 본 연구는 서비스 회복에 대한 대응 노력의 과정에서 서비스 실패의 상황을 심각성과 통제성으로 구분하였다. 이때, 공정성 지각이 신뢰와 만족에 미치는 영향과 더불어 종업원 진정성의 역할을 실증적으로 검증하여 중요성을 제시하고자 한다. 연구 대상은 서비스 불만을 제기한 경험이 있는 206명의 설문 자료를 SPSS, AMOS를 이용하여 분석하였다. 연구 결과를 요약하면 첫째, 서비스 실패 심각성은 공정성에 부(-)의 영향을 미치지 않았고, 서비스 실패 통제성만이 공정성에 부(-)의 영향을 미치는 것으로 나타났다. 둘째, 공정성 지각은 신뢰와 만족의 관계에서 정(+)의 영향을 미치는 것으로 나타났으며, 회복된 신뢰는 만족에 유의한 영향을 미치는 것으로 나타났다. 셋째, 심각성, 통제성, 공정성, 신뢰와 만족간의 구조적 관계에서 진정성에 의해 조절효과가 있는 것으로 나타났다. 이러한 연구 결과에 근거하여 시사점을 제시하고 미래 연구를 제안하였다.

• 식물병연구
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• 제18권2호
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• pp.117-122
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• 2012

감자 더뎅이병 방제에 대한 토양 pH 조절의 효과를 더뎅이병에 감염된 포장에서 2006년 평가하였다. 원래 pH가 5.7이었던 토양을 pH 5.0, 6.0, 6.5로 조절하고자 유황(42 kg/10a)과 소석회(81.6 kg/10a, 184.5 kg/10a)를 처리하였고 석고(522 kg/10a)도 토양 pH와 더뎅이병 발생에 미치는 영향을 구명하고자 처리하였다. 유황처리구의 토양 pH는 괴경형성기에 5.13, 수확기에는 5.01로 지속적으로 감소하였다. 또한 괴경의 발병도는 22.8%로 상대적으로 낮았으며 90.5%의 높은 상품수량을 나타내었다. 반면 소석회를 81.6 kg/10a과 184.5 kg/10a 처리한 구의 토양 pH는 수확기에 6.06과 6.49로 증가하였고, 각각 51.0%와 61.1%의 높은 발병도와 55.7%와 37.0%의 낮은 상품수량을 보였다. 한편 석고처리구는 수확기까지 토양 pH의 변화가 거의 없었으며 발병도와 상품수량도 무처리구와 유의적인 차이가 없었다. 감자 더뎅이병의 방제를 위하여 윤작작물을 2005년부터 2007년까지 재배하고 2008년에 감자를 재배하였다. 3년 윤작 후의 발병도는 파, 콩, 옥수수, 배추 시험구에서 각각 13.1%, 16.7%, 28.9%, 30.2%로 감자 연작구의 73.1%에 비해 상당히 낮았으며 상품수량도 이와 유사한 경향을 보였다. 본 연구 결과에서 살펴본 바와 같이 토양 pH의 조절과 윤작은 감자 더뎅이병 방제를 위해 단장기적으로 활용될 수 있을 것으로 판단된다.

• 한국산학기술학회논문지
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• 제14권10호
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• pp.4910-4918
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• 2013

본 연구는 급성심근경색환자의 효율적인 재원일수 관리를 위해 재원일수에 대한 중증도 보정 모형을 개발하고자 하였다. 2004-2009년 퇴원손상심층조사 자료에서 주진단이 I21인 급성심근경색환자 6,074명을 추출하였으며, 모형 개발 시 데이터마이닝 기법(다중회귀분석, 의사결정나무, 신경망 기법)을 적용하였다. 개발된 모형들 중에서 의사결정나무 모형이 가장 우수한 모형으로 판정되어 이를 본 연구의 중증도 보정 모형으로 채택하였다. 급성심근경색 환자의 재원일수의 중증도 보정에 영향을 미치는 주요한 요인은 관상동맥우회술 시행유무, 퇴원 시 사망유무, 동반지수 등 이였으며, 병상규모와 의료기관 소재지 별로 중증도 보정 재원일수와 실제 재원일수에 차이가 있었다. 급성심근경색환자의 재원일수 변이를 줄이고 효율적으로 관리하기 위해서는 개발된 모형에 각 의료기관의 자료를 적용하여 중증도를 보정한 후, 차이가 나는 요인을 규명하여 이를 해결하는 활동이 수행되어야 할 것이다.

• 대한산업공학회지
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• 제16권1호
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• pp.1-15
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• 1990

An AQL type variables sampling system with switching rules is proposed. Comparative studies of existing variables sampling standards - MIL-STD-414, ANSI Z1.9, ISO 3951, and BS 6002 - are made, and simulation studies on switching procedures are conducted. Based on comparative and simulation studies, a variables sampling standard for Korean industry is proposed. The master sampling tables of the proposed standard are taken from the variables standard ANSI Z 1. 9 and the switching rules are matched to the attributes standard KS A 3109 to enable us to move between the proposed variables standard and KS A 3109. Composite OC and ASN curves of the proposed standard are calculated for selected combinations of lot sizes and AQL's and they are compared with those of ANSI Z1.9.

• 디지털융복합연구
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• 제15권3호
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• pp.343-351
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• 2017

본 연구는 장애학생의 현재 삶의 만족도에 미치는 영향 요인을 분석함으로써 장애 아동 및 청소년들의 삶의 만족도를 높이는데 필요한 기초자료를 제공하는 것을 목적으로 하고 있다. 이를 위해 보건복지부에서 실시한 2014년 장애인실태조사 원 자료를 분석 자료로 하여, 초등학교, 중학교, 고등학교에 재학 중인 학생 197명을 대상으로 가족관계 만족도, 가정폭력 여부, 경제상태, 가구 유형, 차별정도, 장애정도, 주관적 건강상태, 친구들의 수 만족도, 학교생활적응도 등 가정, 학교 및 장애 특성 요인이 삶의 만족도에 영향을 미치는 지를 검증하고자 집단 간 평균비교 및 다중회귀분석 등을 실시하였다. 분석결과 가정폭력 여부, 가족관계 만족도, 주관적 건강상태, 친구의 수 만족도 등이 장애학생의 삶의 만족도에 영향을 미치는 것으로 나타났다. 이러한 연구결과를 토대로 가족 구조와 기능강화, 아동 및 청소년들과 가족이 함께하는 프로그램 확대, 사회성 강화 프로그램 실시, 건강 증진 방안 등이 필요함을 시사한다.

• 생물정신의학
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• 제2권1호
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• pp.115-122
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• 1995

This study was performed to know the relationship between neurologic soft signs (NSS) and clinical variables such as psychopathology. history of illness, and premorbid social adjustment in patients with schizophrenia. The authors evaluated NSS in 31 patients with schizophrenia using the structured tool for measuring neurologic abnormalities, Neurological Evaluation Scale- Korean Version(NES-K). Relationships between NSS and clinical variables such as duration of illness, intensity of precipitating stressors, duration of outpatient treatment, schooling, peer relationship, total duration of unemployment, total days of psychiatric admission, age, total days of being medicated, age at the first psychiatric admission, frequency of admissions, content of treatment, social adjustment, and severity of symptoms were analyzed. Differences between paranoid and non-paranoid schizophrenics were examined. In addition, Differences between patients with schizophrenia who have predominant positive symptoms and who have predominant negative symptoms were examined too. Total scores of NES-K were correlated with lower schooling (${\gamma}$=0.44, p<0.01). Scores of motor coordination subcategory were correlated with poor peer relationship(${\gamma}$=0.67, p<0.001). Other clinical variables were not correlated with any scores of NES-K. Paranoid and non-paranoid schizophrenics were not different in scores of NES-K. Also positive and negative schizophrenics were not different in scores of NES-K. Most clinical variables except schooling and peer relationship were not related with NSS. This results indicated that the meaning of these signs was not fully be understood. Introduction of the new classification concepts such as deficit or non-deficit syndrome will be helpful to elucidate the meaning of NSS in patients with schizophrenia.

• 대한조현병학회지
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• 제22권2호
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• pp.51-55
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• 2019

Objectives: Late-onset schizophrenia (LOS, age at first onset ≥40 years) is characterized by including predominance of women, better premorbid social adjustment and lower severity of positive/negative symptoms. However, few studies have been conducted on LOS, especially in Asian countries. This study aimed to examine the clinical features of LOS in comparison with early-onset schizophrenia (EOS). Methods: By retrospectively reviewing medical records, we assessed demographic data and clinical features of 76 LOS (20 males) and 357 EOS (144 males) who admitted to the psychiatric ward of a general hospital. Results: The mean ages of onset were 47.3±5.1 (LOS) and 25.7±6.5 (EOS) years. There were significantly more women in LOS (73.7%) than EOS (59.6%). Significantly more LOS patients had a marital (88.2% vs. 25.8%) and employment history (28.9% vs. 13.1%) than EOS. Patients with LOS had fewer negative (14.3±9.0 vs. 19.9±9.3), general psychopathology score (36.9±11.1 vs. 42.3±13.9) than EOS patients. Conclusion: In line with previous studies, this study demonstrated that LOS patients have better premorbid social adjustment. Our finding also replicates previous findings that LOS patients differ from EOS in predominance of women and relative lack of negative symptoms. These results suggest that LOS may be a distinct subtype of schizophrenia.

• 한국의료질향상학회지
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• 제10권2호
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• pp.216-231
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• 2003

Objectives: To develop a model that predicts a death probability of acute myocardial infarction(AMI) patient, and to evaluate a performance of hospital services using the developed model. Methods: Medical records of 861 AMI patients in 7 general hospitals during 1996 and 1997 were reviewed by two trained nurses. Variables studied were risk factors which were measured in terms of severity measures. A risk model was developed by using the logistic regression, and its performance was evaluated using cross-validation and bootstrap techniques. The statistical prediction capability of the model was assessed by using c-statistic, $R^2$ as well as Hosmer-Lemeshow statistic. The model performance was also evaluated using severity-adjusted mortalities of hospitals. Results: Variables included in the model building are age, sex, ejection fraction, systolic BP, congestive heart failure at admission, cardiac arrest, EKG ischemia, arrhythmia, left anterior descending artery occlusion, verbal response within 48 hours after admission, acute neurological change within 48 hours after admission, and 3 interaction terms. The c statistics and $R^2$ were 0.887 and 0.2676. The Hosmer-Lemeshow statistic was 6.3355 (p-value=0.6067). Among 7 hospitals evaluated by the model, two hospitals showed significantly higher mortality rates, while other two hospitals had significantly lower mortality rates, than the average mortality rate of all hospitals. The remaining hospitals did not show any significant difference. Conclusion: The comparison of the qualities of hospital service using risk-adjusted mortality rates indicated significant difference among them. We therefore conclude that risk-adjusted mortality rate of AMI patients can be used as an indicator for evaluating hospital performance in Korea.

• Earthquakes and Structures
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• 제16권6호
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• pp.715-726
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• 2019

Several municipal seismic vulnerability investigations have been identified pounding of adjacent structures as one of the main hazards due to the constrained separation distance between adjacent buildings. Consequently, an assessment of the seismic pounding risk of buildings is superficial in future adjustment of design code provisions for buildings. The seismic lateral oscillation of adjacent buildings with eccentric alignment is partly restrained, and therefore a torsional response demand is induced in the building under earthquake excitation due to eccentric pounding. In this paper, the influence of the eccentric seismic pounding on the design demands for adjacent symmetric buildings with eccentric alignment is presented. A mathematical simulation is formulated to evaluate the eccentric pounding effects on the seismic design demands of adjacent buildings, where the seismic response analysis of adjacent buildings in series during collisions is investigated for various design parameters that include number of stories; in-plan alignment configurations, and then compared with that for no-pounding case. According to the herein outcomes, the effects of seismic pounding severity is mainly depending on characteristics of vibrations of the adjacent buildings and on the characteristics of input ground motions as well. The position of the building wherever exterior or interior alignment also, influences the seismic pounding severity as the effect of exposed direction from one or two sides. The response of acceleration and the shear force demands appear to be greater in case of adjacent buildings as seismic pounding at different levels of stories, than that in case of no-pounding buildings. The results confirm that torsional oscillations due to eccentric pounding play a significant role in the overall pounding-involved response of symmetric buildings under earthquake excitation due to horizontal eccentric alignment.