• 보건행정학회지
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• 제30권3호
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• pp.418-429
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• 2020

Background: This study aims to analyze the cost and the length of stay (LOS) of acute myocardial infarction (AMI) patients with coronary artery stenting according to the characteristics of individuals and institutions. Methods: The data was collected from Korean National Health Insurance Service's customized database in 2010 and 2015. Chi-square test, t-test, analysis of variance, and multilevel analysis were performed. Results: The intraclass correlation coefficients for cost were 7.02% in 2010, 5.61% in 2015 and for LOS were 3.17%, 1.40%, respectively. The average costs were 9,067,000 won in 2010 and 9,889,000 won in 2015 (p<0.0001). However, the cost in 2015 was lower than the cost applying increased fee. The costs increased in aged 50-59 years, 60-69 years, and aged ≥70 years versus in aged under 49 years. The cost was higher in Charlson comorbidity index (CCI) 3 to 4 and ≥5 than in CCI 0. The costs were lower in male, medical aid recipients, metropolises, and local hospitals in other regions in 2010. LOS decreased from 8.1 days in 2010 to 7.4 days in 2015. It decreased in male, high income group, and the group of admission via emergency room. However, it increased in higher ages and medical aid recipients, and it also increased when CCI rose. The Internal Herfindahl Index was related to LOS in 2010. Conclusion: The variation of hospital level was small compared to the patient level. Therefore, it is important to implement applicable policies at the patient level in order to reduce cost and LOS of AMI patients.

• 디지털융복합연구
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• 제10권1호
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• pp.413-422
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• 2012

본 연구는 급성심근경색증 입원환자를 대상으로 중증도가 보정된 적정 재원일수 예측모형을 개발하여 의료의 질 관리 및 정책 개발에 필요한 기초자료를 제시하고자 하였다. 2004-2006년 퇴원손상심층조사 자료 중 급성심근경색증 입원환자 2,309명을 대상으로 급성심근경색증 입원환자의 적정 재원일수 예측모형은 데이터마이닝을 이용하여 개발하였다. 의사결정나무 모형에 따라 급성심근경색증 입원환자의 평균재원일수에 가장 큰 영향을 미치는 변수는 관상동맥우회술(CABG)과 동반질환 건수로 나타났다. 앙상블 모형을 이용하여 개발된 급성심근경색증 입원환자의 중증도 보정 재원일수 모형 결과, 적정 재원일수와 실제 재원일수의 차이는 보험유형과 의료기관 소재지가 통계적으로 유의하게 나타났다. 따라서 재원일수의 변이를 줄이고 효율적으로 관리하기 위해 의료기관에서는 다빈도 질환에 대한 중증도 보정 적정 재원일수 예측모형을 개발하여 이를 의료정보시스템에 적용하고 관리하는 활동을 전개해야 할 것이다.

• 전기학회논문지P
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• 제64권2호
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• pp.85-91
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• 2015

With the increasing popularity of Smart Grid infrastructure, it is much easier to collect energy usage data using AMI (Advanced Measuring Instrument) from residential housing, buildings and factories. Several researches have been done to improve an energy efficiency by analyzing the collected energy usage data. However, it is not easy to store and analyze the energy data using a traditional relational database management system since the data size grows exponentially with an increasing popularity of Smart grid infrastructure. In this paper, we are proposing a Hadoop based Big data system to store and analyze energy usage data. Based on our limited experiments, Hadoop based energy data analysis is three times faster than that of a relational database management system based approach with the current system.

• 한국ITS학회 논문지
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• 제9권4호
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• pp.43-51
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• 2010

본 논문에서는, 실내 환경 LED-ID 통신 시스템에서의 고속 데이터 전송을 위한 라인코딩 기법에 대해 연구하였다. LED-ID 기술은 LED를 통해 방사되는 가시광을 이용한 차세대 통신 시스템으로, 유비쿼터스 네트워크 서비스 구축 시 에너지 절감 효과를 가져올 수 있다. 또한 LED-ID 통신 시스템은 기존 인프라를 활용하여 고출력 전송이 가능하며 유지 보수 비용을 절감할 수 있다. 그러므로, 기존 RF 시스템에 비해 실내 무선 통신 구축에 있어서 다양한 장점을 가진다. 이러한 장점을 바탕으로, 본 논문에서는 실내 환경의 LED-ID 통신 채널을 분석하고, 분석된 채널에 적합한 라인 코딩 (NRZ, AMI, 4B5B, HDB3, 8B10B)을 도출하여 고속 데이터 전송을 실현하고자 한다.

• Healthcare Informatics Research
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• 제24권4호
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• pp.346-358
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• 2018

Objectives: The association between obstructive sleep apnea (OSA) and mortality or serious cardiovascular events over a long period of time is not clearly understood. The aim of this observational study was to estimate the clinical effectiveness of continuous positive airway pressure (CPAP) treatment on an outcome variable combining mortality, acute myocardial infarction (AMI), and cerebrovascular insult (CVI) during a follow-up period of 15.5 years ($186{\pm}58$ months). Methods: The data set consisted of 978 patients with an apnea-hypopnea index (AHI) ${\geq}5.0$. One-third had used CPAP treatment. For the first time, a data-driven causal Bayesian network (DDBN) and a hypothesis-driven causal Bayesian network (HDBN) were used to investigate the effectiveness of CPAP. Results: In the DDBN, coronary heart disease (CHD), congestive heart failure (CHF), and diuretic use were directly associated with the outcome variable. Sleep apnea parameters and CPAP treatment had no direct association with the outcome variable. In the HDBN, CPAP treatment showed an average improvement of 5.3 percentage points in the outcome. The greatest improvement was seen in patients aged ${\leq}55$ years. The effect of CPAP treatment was weaker in older patients (>55 years) and in patients with CHD. In CHF patients, CPAP treatment was associated with an increased risk of mortality, AMI, or CVI. Conclusions: The effectiveness of CPAP is modest in younger patients. Long-term effectiveness is limited in older patients and in patients with heart disease (CHD or CHF).

• 한국전자통신학회논문지
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• 제10권1호
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• pp.39-46
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• 2015

본 논문은 유니코드 한글글자마디부호를 사용할 때 스크램블링으로 인하여 회선부호기의 데이터 전송효율에 미치는 영향을 연구하였다. 회선부호기의 스크램블링은 원천부호의 문제를 해결하기 위한 것이다. 본 논문은 장거리전송에 사용되는 AMI회선부호화에 적용하는 국제표준방식인 HDB-3 스크램블링 방식을 토대로 하였다. 본 연구에 필요한 한글글자마디와 이에 대한 사용빈도는 국립국어원의 한국어자료를 분석한 데이터를 사용하였다. 연구결과 유니코드 한글글자마디에서 평균 24%의 스크램블링이 발생하였다. 유니코드 한글글자마디부호에 참고된 한글글자마디를 적용할 경우에 평균 27%의 스크램블링이 발생하였다. 유니코드 총 11,172개의 한글글자마디에서 스크램블링이 발생하지 않는 글자마디는 총 8,928개였다. 그러므로 참고된 한글글자마디 총1,540자를 스크램블링이 발생하지 않는 부호영역에 수용하여 스크램블링이 발생되지 않는 원천부호체계를 만드는 것이 가능하다는 결론을 도출하였다. 새로운 한글글자마디 부호체계를 적용할 경우, 27%의 스크램블링을 완전히 제거할 수 있다. 또한 물리계층의 회선 부호화기에서 발생하는 스크램블링을 표현계층에서 소프트웨어 적으로 수행하게 되어, 회선부호기의 데이터전송처리 효율을 최소 27%이상 제고시킬 수 있다.

• KEPCO Journal on Electric Power and Energy
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• 제2권1호
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• pp.61-69
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• 2016

Understanding load patterns and customer classification is a basic step in analyzing the behavior of electricity consumers. To achieve that, there have been many researches about clustering customers' daily load data. Nowadays, the deployment of advanced metering infrastructure (AMI) and big-data technologies make it easier to study customers' load data. In this paper, we study load clustering from the view point of yearly and daily load pattern. We compare four clustering methods; K-means clustering, hierarchical clustering (average & Ward's method) and DBSCAN (Density-Based Spatial Clustering of Applications with Noise). We also discuss the relationship between clustering results and Korean Standard Industrial Classification that is one of possible labels for customers' load data. We find that hierarchical clustering with Ward's method is suitable for clustering load data and KSIC can be well characterized by daily load pattern, but not quite well by yearly load pattern.

• 한국컴퓨터정보학회논문지
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• 제17권10호
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• pp.145-154
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• 2012

현대 사회는 서구화된 식생활 패턴과 흡연, 비만 등의 원인으로 인해 심혈관계 질환들이 급증하고 있다. 특히, 급성심근경색은 심혈관계 질환으로 인한 사망의 대부분을 차지하고 있다. 이러한 추세에 따라 해외 선진국에서는 임상생리학적 오류를 줄이기 위해서 자국민의 데이터를 기반으로 급성심근경색의 발병 및 질병에 영향을 미치는 위험인자를 찾는 연구가 활발히 진행되고 있다. 하지만 한국인에 적합한 급성심근경색 예후 진단 예측 시스템이 미비한 실정이다. 따라서 이 논문에서는 KAMIR(Korea Acute Myocardial Infarction Registry) 데이터베이스에서 제공 받은 급성심근경색 환자의 예후 데이터를 기반으로 ST분절 급상승 심근경색 재발 환자들의 단기 사망률 예측모델을 찾고자 한다. 실험을 통해 로지스틱 회귀 분석에 의해 추출된 속성 집합을 적용하였을 때 기존의 원시 데이터 보다 높은 정확도를 얻을 수 있었으며, 인공신경망의 경우 다른 분류기법들보다 높은 성능을 보였다. 이를 통해 ST 분절 급상승 심근경색 재발 환자들의 단기 사망률을 예측함으로써 향후 고위험군 환자들의 관리에 도움을 줄 수 있을 것으로 기대한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 B
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• pp.847-849
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• 1996

As the power demands increases, one of the most important data is inside electric field of equipment in designing of insulators ami insulated wire for EHV distribution line. So far finite element analysis method is widely used to calculate this electric field. However as the shape of insulator becomes complicated, it is difficult in producing the mesh which suitable the shape. Especially, we have many difficulty that produce dense fine mesh only where the electric field is concentrated. Therefore in this paper, we perform the each conditional analysis of electric field using the Maxwell 3D Simulator to recover this defects. And we try to analyze electric field through the conventional 2 dimensional and 3 dimensional analysis in case of salt contamination on the surface of a insulator.

• 아동학회지
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• 제4권
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• pp.11-21
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• 1983

The purpose of this study was to investigate the relationship between internal locus of control in children and parents' child rearing attitudes which children perceive. For this purpose, 198 fifth grade boys and 163 fifth grade girls were randomly selected and their perception of their parents' child rearing attitudes and their locus of control were measured. Children's locus of control was measured by A Locus of Control Scale For Children of Nowicki & Strickland (1973) which was translated into Korean and item analysis of which was done. Ami Children's perception of their Darents' child rearing attitudes measured by Parent-Child Relationship Inventory which was constructed in Korean Testing Center. For the data analysis, t-test and two-way analysis of variance were applied and Pearson correlation coefficient was computed. The results of the present study were as follows; 1. The correlations between children's perception of their parents' child rearing attitudes and locus of control in children were significant partly. Especially, internal children reported their parents as showing less rejective attitude and less different child rearing attitude between father and mother. 2, Sons were more influenced by their parents' child Learing attitudes than daughters in the development of locus of control 3. Maternal child rearing attitude was more influential than paternal child rearing attitude in the development of locus of control.