• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.732-737
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• 2006

The facility diagnosis technique of past subjective judged the technical expert and interpreted stably mainly. The facility the periodical civil official becomes indispensability consequently with the law and the system and objectivity inspection which relates with a this and development of diagnosis technique were necessary. Currently the evaluation elements which relate with an inspection and diagnosis technique depended to the subjectivity of each facility quality, data statistics, diagnosis know-how, various circumstance and the technical expert and the evaluation item came to decide. But the evaluation score distribution of marks of each item depended plentifully in data analysis result and experience. The past method is weak in logically because the objection theoretical background and basis are insufficiency. Consequently in order to apply a data analysis result and an experience logically, it used AHP(Analytic Hierarchy Process) method from this research. It is visible with the fact that the application result reconfirmation and complement process will be necessary the technique which is suitable in the multi facility management. Also it is expected with the fact that the application characteristic from the next relation technique will be excellent.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 추계학술대회 논문집
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• pp.274-278
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• 2002

Surface finishing is still indispensable for most rapid prototyping (RP) processes because of the inherent stair-stepped surface and shrinkage of the parts. These problems can be minimized in the $VLM-_ST$ Process, because it uses expandable polystyrene foam sheets, each of which has a thickness of3.9 mm and a linear-interpolated side slope. The use of thick layers, however, limits the process capability of constructing fine details. This study focuses on the design of post-processing tool for fine details of $VLM-_ST$ parts and investigation of thermal characteristics during EPS foam cutting using the post-processing tool. To calculate the heat flux from the tool into the foam sheet, the tool was modeled as a heat source of radiation for finite element analysis. Results of the analysis agreed well with those of the experiment.

• Imaging Science in Dentistry
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• 제48권1호
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• pp.67-72
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• 2018

Historically, Eagle syndrome is a term that has been used to describe radiating pain in the orofacial region, foreign body sensation, and/or dysphagia due to a unilateral or bilateral elongated styloid process impinging upon the tonsillar region. Because elongated styloid processes-with or without associated Eagle syndrome-can present with various symptoms and radiographic findings, it can be challenging for healthcare practitioners to formulate an accurate diagnosis. Abnormal styloid anatomy can lead to a multitude of symptoms, including chronic orofacial/neck pain, thus masquerading as more commonly diagnosed conditions. In this report, we describe a patient who presented to our department with styloid process elongation and fracture. A careful history, physical examination, and a cone-beam computed tomography (CBCT) investigation led to the diagnosis. The patient was then referred for appropriate care. This case report demonstrates the utilization of CBCT in differentiating a fracture site from a pseudo-joint that might mimic a fracture.

• 보존과학회지
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• 제35권1호
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• pp.33-40
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• 2019

During the conservation and maintenance of the birthplace center yard of President Asan Yoon Bosun, four porcelain enamel dishware were excavated from the central yard well. The glaze layer of excavated enamel was severely damaged; hence, the conservation process was done rapidly. In addition, scientific investigation and analysis were conducted to confirm the material properties of the glaze layer. It was confirmed that the outer surface was inverted and dried, while the inner surface was upright and fired during the glazing and drying process by measuring the film thickness. By examining the breakup phenomenon, the breaking up of the white enamel on the colored enamel was confirmed. This indicates that the colored glaze rose to the surface depending on the density of the colored glaze and white glaze. The investigation of the cross-section of the film confirmed that the lower layer formed according to the bonding properties with metal during the glazing process. Analysis of the constituents of the identified lower layer confirmed that there are differences between the specific components of the metal oxide of the lower layer and the surface color development of the upper layer.

• 한국안전학회지
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• 제39권2호
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• pp.22-27
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• 2024

The purpose of this study is to explore the trend in insulation resistance values according to temperature and overcurrent by conducting an investigation on the actual condition and experiments on the electrical wiring during the melting furnace process. In addition, the Arrhenius equation is used to determine whether temperatures in the furnace operating process can be applied to the actual field. In the investigation of the actual condition, the insulation resistance started to decrease seven years after replacement, even though cables in oil pump A were replaced in 2010. Both the experimental and theoretical values of the insulation resistance obtained using the Arrhenius equation decreased with an increase in temperature. Errors in insulation resistance (MΩ) values between tests and the Arrhenius equation ranged from ±2 to ±10, demonstrating a high similarity. Results revealed that when the insulation resistance cannot be measured in a manufacturing workplace (quarterly analysis), it can be estimated by partially applying the Arrhenius equation.

• 한국과학교육학회지
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• 제21권1호
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• pp.1-12
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• 2001

확장적 과학 탐구는 실제의 과학 활동에 보다 가까운 포괄적인 과학 탐구의 기회를 제공한다는 점에서 학교 과학교육에서 추구되어야 하며 이러한 탐구 활동을 통한 교육적 성취 중 중요한 하나가 탐구 동기라고 할 수 있다. 본 연구에서는 확장적 과학 탐구 과제의 특징인 실제성, 개방성, 연속성이 중학생의 탐구 동기에 어떠한 영향을 미치는지 구체적인 사례 분석을 통하여 탐색하였다. 탐구 동기를 조사하기 위한 설문 결과와 학생들의 과학 학습 성취 수준을 고려하여 면담 대상 학생 10명을 추출하였으며 개별 면담 결과를 기록하여 탐구 동기의 변화 사례 및 원인을 분석하였다. 확장적 탐구에 대해 정적 탐구 동기를 나타낸 학생들은 교과서 탐구가 이론의 확인에 그친다는 점에서 비판적이었으며 확장적 탐구 과제의 실제성과 개방성을 정적 탐구 동기의 주요 원인으로 인식하였다. 또 확장적 탐구에 대해 부적 탐구 동기를 보인 학생들은 교과서 중심의 학습을 강하게 선호하였으며 확장적 탐구 과제의 개방성을 부적 탐구 동기의 주요 원인으로 인식하였다. 연속성에 대해서는 대체적으로 긍정적인 반응보다는 부정적인 반응이 다소 많았으나 탐구 동기의 주요 원인으로 인식되지는 않았다.

• 한국안전학회지
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• 제34권1호
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• pp.62-69
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• 2019

Korean shipbuilding companies have taken many efforts for safety over the years by developing Health, Safety & Environment (HSE) Management Systems, Procedures, Training, and studying Programs for prevention of incidents. As a result, the shipbuilding industry has succeeded in reducing overall injury rates. Nevertheless, the industry also noticed that incident rates are still not at zero and more importantly, serious injuries and fatalities are still occurring. One factor that may be attributing to this is the lack of managing potential severity during incident investigations, most incident investigations are implemented based on the actual result. Generally, each shipbuilding company develops their customized incident investigation programs and these are also commonly being focused on actual result. This study aimed to develop a shift in strategy toward safety to classify the criteria of potential severity from any incidents and manage that to prevent any recurrence or causing any serious injuries or fatalities in the shipbuilding industry. Several global energy companies have already developed potential severity management tools and applied them in their incident investigations. In order to verify the necessity of improvement for current systems, a case study and comparative analysis between a domestic shipbuilding company and several global energy companies from foreign countries was implemented and comparison of two incident investigation cases from specific offshore projects was conducted to measure the value of a potential severity system. Also, a checklist was established from the data of fatalities and serious injuries in recent 5 years that occurred in Korea shipbuilding industry and a proposal to verify high potential incidents in the incident investigation process and comparative analysis between the assessment by appling proposed checklist and the assessment from a global energy company by using their own system was implemented. As a measure to prevent any incidents, it is required to focus on potential severity assessment during the incident investigation rather than to only control actual result. Hence, this study aims to propose a realistic plan which enables to improve the existing practices of incident investigation and control in the shipbuilding industry.

• 한국과학교육학회지
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• 제43권6호
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• pp.495-507
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• 2023

센스메이킹 활동에서 교사는 학생과 함께 질문을 고안하고 조사과정을 설계할 때 많은 어려움을 겪는다. 그 주된 이유로 새로운 설명을 고안하는 과정에서 개념적 이해가 어떻게 활용되는지 예상하기 어렵다는 점이 있다. 본 연구에서는 센스메이킹 목표하에 이루어지는 활동 설계에서 어떠한 인식적 준거 활용되는지 밝히고, 각 준거를 중심으로 한 논의에서 학생의 개념적 이해가 어떻게 활용되는지 드러내고자 했다. 이를 위해 센스메이킹 활동에 참여한 학생들의 조별 활동 과정을 탐색했으며, 이때 센스메이킹의 목표하에 이루어진 질문 고안과 조사 과정 설계과 탐구활동의 단순화된 절차 수행의 목표가 잘 반영된 과정을 비교 탐색했다. 분석 결과, 센스메이킹 과정 설계에서 활용되는 인식적 준거는 현상의 흥미로움 여부, 자료 수집 가능성, 관측 가능하며 현상을 설명할 수 있는 변인으로의 해석 가능성으로 도출되었다. 이에 반해 탐구활동의 단순화된 절차 수행의 목표가 두드러진 사례에서는 자료 수집 가능성만이 인식적 준거로 활용된 것으로 나타났다. 현상의 흥미로움 여부를 중심으로 한 논의에서는 탐구하는 현상 속 요소의 구조, 기능에 관한 개념적 이해가 학생들이 탐구하고자 하는 현상을 규명하고 해당 현상에 대한 기존 지식을 점검하는 과정에서 활용되었다. 야외에서 자연현상을 탐색하는 과정에서 관측 자료, 즉 사실적 이해가 형성되는 것으로 나타났다. 이와 더불어 탐구하고자 하는 현상과 관련하여 문헌에서 찾아낸 정보인 사실적 이해는 해당 현상에 대한 새로운 지식 고안이 필요한지 여부를 판단하는 데 활용되었다. 자료 수집 가능성에 대한 논의에서는 탐구 현상의 구성 요소를 주어진 자원 내에서 조사할 수 있을지 판단하는 과정에서 각 요소에 대응하는 구조, 기능에 관한 개념적 이해가 활용되었다. 이때 각 요소의 관측 가능성을 논하며 절차적 이해가 함께 활용되었다. 세 번째 인식적 준거는 관측 가능하며 현상을 설명할 수 있는 변인으로의 해석 가능성이었다. 이 준거를 바탕으로 한 논의에서는 일상 용어를 활용한 표현을 관측 가능한 변인으로 변환하고, 다시 관측 결과 구성한 사실적 이해의 의미를 일상 용어로 해석할 수 있는 방안이 다루어졌다. 이 과정에서 기능에 관한 개념적 이해, 해당 개념과 관련된 사실적 이해가 활용되었다. 그리고 탐구하는 현상의 요소들을 변인으로 해석하기 위해서 해당 현상을 설명할 수 있는 포괄적인 기작에 대한 개념적 이해가 활용되었다. 본 연구 결과는 과학 수업에 자연현상에 대한 설명 구성 과정을 도입한 취지를 반영한 센스메이킹 활동을 운영하고, 학생과 함께 센스메이킹 과정을 설계할 때의 개념적 지원 방안을 마련하는 데 기여할 수 있을 것으로 기대한다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2002년도 학술대회지
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• pp.353-356
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• 2002

Planar laser induced fluorescence(PLIF) has been widely used to obtain two dimensional fuel distribution. Preliminary investigation was performed to measure quantitative air excess ratio distribution in an engine fueled with LPG. It is known that fluorescence signal from acetone as a fluorescent tracer is less sensitive to oxygen quenching than other dopants. Acetone was excited by KrF excimer laser (248nm) and its fluorescence image was acquired by ICCD camera with a cut-of filter to suppress Mie scattering from the laser light. For the purpose of quantifying PLIF signal, an image processing method including the correction of laser sheet beam profile was suggested. Raw images were divided by each intensity of laser energy and profile of laser sheet beam. Inhomogeneous fluorescence images scaled with the reference data, which was taken by a calibration process, were converted to air excess ratio distribution. This investigation showed instantaneous quantitative measurement of planar air excess ratio distribution for gaseous fuel.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제9권3호
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• pp.295-303
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• 2005

Students' mathematics application ability is a hot spot which mathematics education pays attention. So, I have carried on the test of mathematics application and the questionnaire survey to student of Senior One of the two middle schools. Through the test and the investigation, I discover that the level of the students' mathematics application ability is not high. To the simple application question, the difference of the male and the female is not big, but to the difficult application question, the male and the female has the remarkable difference. The students' lack of flexible and the original cognition monitoring ability in mathematics application process are afraid of studying mathematics application since childhood and lack of the training of this aspect. They thought mathematics foundation and reading understood ability is the key of mathematics application. Through analysis result of investigation, this paper proposed the way to raise mathematics application ability of students.