• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제51권5호
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• pp.242-248
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• 2002

It is important to develop new effective technologies to increase the interruption capacity and to reduce the size of a UB(Gas Circuit Breakers). Major design parameters such as nozzle geometries and interrupting chamber dimensions affect the cooling of the arc and the breaking performance. But it is not easy to test real GCB model in practice as in theory. Therefore, a simulation tool based on a computational fluid dynamics(CFD) algorithm has been developed to facilitate an optimization of the interrupter. Special attention has been paid to the supersonic flow phenomena between contacts and the observation of hat-gas flow for estimating the breaking performance. However, there are many difficult problems in calculating the flow characteristics in a GCB such as shock wave and complex geometries, which may be either static or in relative motion. Although a number of mesh generation techniques are now available, the generation of meshes around complicated, multi-component geometries like a GCB is still a tedious and difficult task for the computational fluid dynamics. This paper presents the CFD program using CFB-CAD integration technique based on Cartesian cut-cell method, which could reduce researcher's efforts to generate the mesh and achieve the accurate representation of the geometry designed by a CAD tools.

• 한국전자통신학회논문지
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• 제13권3호
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• pp.561-570
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• 2018

인공지능은 4차 산업혁명에서 화두 되고 있는 기술 중 하나이며, 세계 각국의 기업들이 주목하고 있는 기술로 교육, 금융, 자동차 등 다양한 산업 분야에 적용해 나가고 있다. 챗봇은 정해진 응답규칙에 따라 사용자 질문에 응답할 수 있도록 만들어진 시스템으로, 지능형 가상 도우미 서비스, 날씨, 교통, 일정 등에 대한 간단한 질의응답부터 사용자의 패턴 분석을 통한 서비스 제공까지 점차 그 활용 범위가 확대되며 생활 밀착형 서비스로 입지를 굳혀갈 전망이다. 이에 인공지능 챗봇에 대한 연구는 반드시 필요하다고 볼 수 있다. 따라서 본 연구에서는 중소상인들을 위한 인공지능 챗봇 서비스 플랫폼 설계 및 구현에 대하여 제시하고자 한다.

• 한국수학교육학회지시리즈A:수학교육
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• 제56권3호
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• pp.281-300
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• 2017

This study analyzed the difficulties of middle school students in computer simulation of the law of large numbers through eye movement analysis. Some students did not attend to the simulation results and could not make meaningful inferences. It is observed that students keep the existing concept even though they observe the simulation results which are inconsistent with the misconceptions they have. Since probabilistic intuition influence student's thinking very strongly, it is necessary to design a task that allows students to clearly recognize the difference between their erroneous intuitions and simulation results. In addition, we could confirm through eye movements analysis that students could not make meaningful observations and inferences if too much reasoning was needed even though the simulation included a rich context. It is necessary to use visual representations such as graphs to provide immediate feedback to students, to encourage students to attend to the results in a certain intentional way to discover the underlying mathematical structure rather than simply presenting experimental data. Some students focused their attention on the visually salient feature of the experimental results and have made incorrect conclusion. The simulation should be designed so that the patterns of the experimental results that the student must discover are not visually distorted and allow the students to perform a sufficient number of simulations. Based on the results of this study, we suggested that cumulative relative frequency graph showing multiple results at the same time, and the term 'generally tends to get closer' should be used in learning of the law of large numbers. In addition, it was confirmed that eye-tracking method is a useful tool for analyzing interaction in technology-based probabilistic learning.

• 한국산업정보학회논문지
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• 제7권5호
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• pp.129-146
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• 2002

본 연구는 유통업의 지식 경영 도입 사례를 중심으로 지식경영시스템(Knowledge Management System)의 전반적인 분석을 통해 합리적이고 효율적인 지식경영 도입 방법을 모색해 본다. 또한 지식경영에 대한 이론적, 실무적 분석을 동시에 파악하여 기존의 이론중심적 접근에서 벗어나 실무적으로 기업에 도입할수 있는 시스템을 검토하여 유통업의 장기적이고 통합적인 지식경영 전략을 모색하는데 그 의의가 있다. 따라서 H사의 실무적인 분석을 통해 기본적인 지식경영의 개념, 절차 그리고 지식경영 조직 및 현황을 파악하고, 나아가 대내외적인 경영환경과 유통업의 실태를 통한 지식경영 도입의 필요성을 검토하여 분석하였다. 이러한 지식경영의 이론과 실무를 겸비한 시스템 분석에 의해 나타나는 제 문제점들을 검토하여 향후 지식경영 시스템의 개선방안을 모색함으로써 지식경영의 성공적 도입 및 정착을 위해 제언하였다. 따라서 본 연구는 지식경영 시스템의 도입에 대한 방향성 구체적인 대한 제시가 되었다는 점은 본 연구의 커다란 성과라 할 수 있을 것이다. 그러나 본 연구의 한계점으로는 다수의 유통업체를 대상으로 사례 분석이 이루어지지 않아 향후 발전 방향에 대한 의문점은 있다 하겠으며, 이를 기업에 대한 설문을 통해 실증적인 분석이 이루어지지 않아 향후의 연구 과제로 남는다.

• 의료법학
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• 제11권2호
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• pp.181-208
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• 2010

Maternity services is often perceived as a troublesome business and obstetric litigation is on the increase in Western countries. Overall, the number of claim and cost of litigation to the NHS Litigation Authority (NHSLA) from maternity services in the UK is increasing every year. Maternity services account for 60-70% of the total sum paid. This has widespread implications for both the individual practitioners and the institutions where they work, due to increasing malpractice insurance premiums. Fear of litigation is also attracting fewer medical graduates into the specialty, leading to a recruitment crisis in obstetrics and gynaecology. The litigation process can cause pain, suffering and distress to clinicians as well as to the patients and their families. Litigation in maternity services is the result of a complex of events when malpractice (presumed or real) impacts on the attitude of pregnant women and their environment. In such complexity, information is mandatory but may often be misinterpreted. If messages are not tailored to the receiver's capacity, communicating well with the pregnant patient becomes crucial. Therefore, to reduce medicallegal issues in obstetrics, increasing attention and an applicable standard of obstetric care to avoid negligence and medical errors should go along with other measures. Considering UK's experiences, NHS redress scheme make it easier to pursue small claims and birth related claims, without necessarily reducing the number of claims processed through the conventional legal system and perhaps encouraging even more of them. The task of dealing with the greater number of inquiries into their practice would inevitably create an added burden for clinicians and hospital managers. Thus further proposals are required to limit the cost of processing inflated claims and to consider whether clinicians should be given some protection from litigation alleging a failure to prevent birth related impairment.

• 한국정보전자통신기술학회논문지
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• 제4권1호
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• pp.23-31
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• 2011

본 논문은 차세대 자동차 지능형 통합 스마트 모니터 시스템을 제작하였다. 차량의 계기판 장치는 많은 방해 요소를 감소시키며, 운전자들에게 영향을 주지 않고 도로에 집중할 수 있도록 하는 것이 필수적이다. 위험 경보는 시각적인 디스플레이와 함께 유용하게 사용되지만 기존의 방식은 문제가 있다. 차량 안전 시스템의 최적화는 위험을 알리는 각종 경보보다 더 필수적인 것은 운전자가 도로에 집중할 수 있는 시각적인 장치가 요구된다. 지능형 통합 스마트 모니터 시스템은 자동차에서 가장 많이 보는 정보인 자동차 속도, 엔진 회전속도, 연료, 엔진 온도, 연료 게이지, 회전표시등과 각종 경보 표시등 기본 정보를 모아서 운전자에게 제공한다. 본 논문에서 설계한 지능형 통합 스마트 모니터 시스템은 박막 트랜지스터 액정 표시 장치, 액정 표시 장치배경 조명 발광다이오드, 평면 미러, 특수 제작된 렌즈 및 구동회로로 구성되어 있으며, 운전자 안전성을 고려한 차세대 지능형 자동차 통합스마트 모니터 시스템을 제작, 분석하였다.

• Journal of Korean Neurosurgical Society
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• 제63권3호
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• pp.346-357
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• 2020

During the follow-up period after surgery for spinal dysraphism, a certain portion of patients show neurological deterioration and its secondary phenomena, such as motor, sensory or sphincter changes, foot and spinal deformities, pain, and spasticity. These clinical manifestations are caused by tethering effects on the neural structures at the site of previous operation. The widespread recognition of retethering drew the attention of medical professionals of various specialties because of its incidence, which is not low when surveillance is adequate, and its progressive nature. This article reviews the literature on the incidence and timing of deterioration, predisposing factors for retethering, clinical manifestations, diagnosis, surgical treatment and its complications, clinical outcomes, prognostic factors after retethering surgery and preventive measures of retethering. Current practice and opinions of Seoul National University Children's Hospital team were added in some parts. The literature shows a wide range of data regarding the incidence, rate and degree of surgical complications and long-term outcomes. The method of prevention is still one of the main topics of this entity. Although alternatives such as spinal column shortening were introduced, re-untethering by conventional surgical methods remains the current main management tool. Re-untethering surgery is a much more difficult task than primary untethering surgery. Updated publications include strong skepticism on re-untethering surgery in a certain group of patients, though it is from a minority of research groups. For all of the abovementioned reasons, new information and ideas on the early diagnosis, treatment and prevention of retethering are critically necessary in this era.

• 인지과학
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• 제1권1호
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• pp.145-164
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• 1989

본 논문은 언어습득 초기단계의 아동이 모국어의 주요분기방향(principal branching direction)에따라 종응사규칙을 습득한다는 최근의 연구결과에 의거한다(Lust,1986).이 연구에 의하면,가령 한국어는 좌행 분기어임을 한국아동은 죄행생략형을 선호할 것이라고 한다.이가설을 시험하기 위해 서울에 거주하는 4:1-9:7의 96명의 아동을 모방유도실험으로 개별연구하였다.문장유형으로는 중복형,우행생략형 및 좌행생략형 등이 이용되었다.실험결과,Lust의 예측과는 달리 좌행분기어인 한국어 습득아동도 우행분기어인 영어습득아동처럼 우행 생략형을 좌행생략형보다 용이하게 일찍 습득하고 있음을 발견하였다.이것은 인간에게 분기방향과 같은 문법적 요소에 상관없이 선행사가 공조응사보다 앞서 언급되는 형태(우행생략형) 를 선호하는 인지적기재가 있음을 시사한다고 사려된다.

• 한국생활과학회지
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• 제18권1호
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• pp.211-221
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• 2009

The study investigated medical treatment features of patients with type 2 diabetes mellitus, their further complications, levels of diet therapy education and the status of dietary compliance. The subjects were patients who came to oriental medicine clinics in Daejon. The percentage of male was 37.5% and female was 62.7% in the subject group's sex distribution. The outbreak of the disease was most common in the age of 50's. Also 40% of the subjects had been suffering for more than 5 years. 35.7% of men and 53.7% of women had family history. All the subjects had further complications, among them hypertension was the most common. Kidney, hepatic, vascular heart diseases were followed. 85.3% of the subjects answered they already had educations about diet therapy. Those educations were given in the public health center, general and private hospitals. 32% of subjects were not practicing diet therapy. The difficulties with which patients can be faced when they take dietary education were exchange(?exchanging?) food and calculating calories. Most of the subjects tend to overlook the importance of dietary habits and show low understanding to diet therapy, which leads to low participation rate of diabetes patients. Based on these results, therefore, we can conclude that diet therapy education to the patients should be more organized and easily practicable for them. To develop educational methods which can draw patients' attention and also be more effective is the most important task.

• 한국안전학회지
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• 제27권4호
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• pp.101-107
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• 2012

The statistics of industrial accident reported by ministry of Employment and Labor denoted a significant increase of musculoskeletal disorders(MSDs) after 1993, and showed the higher incident rate by 71.3% over the overall worker's disorders. Also, it was expected that Korean society will become the post-aged society in 2026 with 20.8% of elderly who is over 65 years old. The reports suggest possible problems caused by the older worker known to have reduced working ability than the young counterparts. On this basis, the goal of this study was to investigate the relationship between MSDs symptoms and work ability in the shipbuilding industry. To achieve this goal, this study distributed a questionnaire for total 1,244 shipbuilding employers, and used 910 employers' reports which revealed validity for this study. The questionnaire included the MSDs symptoms report developed by the Korean Occupational Safety and Health Association(KOSHA) and the work ability index(WAI) developed by Finnish Institute of Occupational Health(FIOH). Results showed no relationship between MSDs symptoms and age, years of work and exercise. Also, the work ability was increased until 44 years old, but it was decreased after that time because of the reduced physical capacity. Meanwhile, the years of work and exercise have positive correlation with work ability. However, the results revealed significant relationships between WAI and age, years of work, task characteristics and exercise. All together, the MSDs symptoms have a close relationship with the work ability in that the work ability of workers with the MSDs symptoms was reduced. This study may suggest the needs of more efforts and attention on the MSDs prevention to increase the work ability.