• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2005년도 제24회 춘계학술대회논문집
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• pp.265-268
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• 2005

Jet A-1과 액체산소를 추진제로 하는 연소압 52.5 bara 추력 30 tonf급 로켓엔진 연소기의 2단 점화시험을 수행하였다. 점화방식으로 TEAL과 액체산소를 사용한 hypergolic 방식을 사용하였다. 산화제 $61\%$, 연료 $67\%$를 공급하여 정상 연소압 대비 $63\%$인 33 abs.bar의 연소압으로 0.25 초 동안 pre-stage 구간을 유지하였다. 2단계의 점화과정을 통해 정상상태에 이르기까지 O/F ratio를 설계조건 보다 낮은 영역에 유지하였다. main-stage로 진입 시 압력피크는 정상 연소압의 $0.6\%$를 보였다.

• 산업기술연구
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• 제39권1호
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• pp.27-31
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• 2019

Semiconductor logistics systems are facing difficulties in increasing production as production processes become more complicated due to the upgrading of fine processes. Therefore, the purpose of the research is to design predictive models that can predict traffic during the pre-planning stage, identify the risk zones that occur during the production process, and prevent them in advance. As a solution, we build FABs using automode simulation to collect data. Then, the traffic prediction model of the areas of interest is constructed using deep learning techniques (keras - multistory conceptron structure). The design of the predictive model gave an estimate of the traffic in the area of interest with an accuracy of about 87%. The expected effect can be used as an indicator for making decisions by proactively identifying congestion risk areas during the Fab Design or Factory Expansion Planning stage, as the maximum traffic per section is predicted.

• 한국학교ㆍ지역보건교육학회지
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• 제19권3호
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• pp.79-93
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• 2018

Objectives: This study aimed to develop a smoking cessation education program and to provide basic data for evaluating program for university students majoring in health sciences. Methods: The education program was developed based on the instructional system design model(ADDIE), that was based on literature review, brainstorming, and interviews of related experts. Education program was implemented for 2 sessions of 3 hours to the 82 university students majoring in health science. Knowledge, competency, and self-efficacy for performance of smoking cessation were analyzed. One group pre- & post-test design was used for evaluation of this program. Results: In the analysis stage, a total of 5 duties, 16 tasks, and 55 task elements were derived. In the design and development stage, based on job analysis, education program contents were composed of understanding tobacco, planning and implementation of smoking cessation program, smoking cessation counseling and drug treatment. After this education program, students achieved remarkable improvement in increasing knowledge, competency, and self-efficacy for smoking cessation counselling and program. Conclusions: It is needed to be included the smoking cessation education in department related to health science regular course.

• 한국의상디자인학회지
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• 제24권3호
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• pp.17-31
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• 2022

The purpose of this research is to suggest diverse directions for eco-friendly knit designing through analyzing the characteristics of Stella McCartney's knit designs. The first stage of the research was to explore the characteristics of eco-friendly fashion design based on literature review. The next stage was to categorize the characteristics of eco-friendly design found in Stella McCartney' knit fashion based on the precedent analysis. The data collected showed 274 examples from 40 Stella McCartney collections, including Spring, Resort, Pre-Fall, and Fall Ready-to-wear collections between 2013 and 2022. All information was collected using www.vogue.com. As a result, the characteristics of Stella McCartney's knit design were classified into four directopms: 1) Perpetual Naturalism, 2) Cultural Complexity, 3) Practical Functionality, and 4) Subcultural Reproducibility. The first characteristic, 'Perpetual Naturalism' values the continuous symbiosis between animals and human beings, thereby protecting global environmental value. Stella McCartney's knit design continuously showed a longing for nature's beauty through fashion design, which allowed people to enjoy the meaning of symbiosis between human beings and animals. Second, 'Cultural Complexity' is the characteristic that appears in Stella McCartney's knit fashion design when collaborating with various artists and/or mixing traditional knit motives inspired by traditional cultures and retro moods. Third, 'Practical Functionality' is the design characterisitic that allows items to be worn for a long time as it is comfortable, simple, and practical. Stella McCartney's knit designs pursue easy-to-wear designs that are comfortable and have practical designs with simple details. Lastly, 'Subcultural Reproducibility' showed in Stella McCartney's knit designs reflect Hippie culture, which pursued a rejection of conventional values, and promoted sustainable energy. This culture peaked in the 1960s and 1970s, when 'Beatles' were mainly working. Additionally, retro styled knit designs inspired by other various music genres from the 1980s and 1990s appeared in this category as well.

• 한국정밀공학회지
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• 제15권2호
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• pp.99-106
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• 1998

In this paper, we have constructed an expert system for semiconductor chip encapsulation which combines a knowledge-based system with CAE software. The knowledge-base module includes heuristic and pre analysis knowledge for evaluation and redesign. Evaluation of the initial design and generation of redesign recommendations can be developed from the rules as applied to a given chip package. The CAE programs can be used for simulating the filling and packing stage of encapsulation process. The expert system is a new tool which enables package design or process conditions with high yields and high productivity.

• 한국인구학
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• 제18권2호
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• pp.51-69
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• 1995

이 연구는 한국사회에서 사회복지 정책을 어떻게 전개해 나가야 할 것인지에 관한 관심 속에서 선진복지국가인 스웨덴의 사회복지제도가 어떻게 발전해 나갔는지를 인구변천에 초점을 맞추어 살펴보고 있다. 먼저 스웨덴과 한국의 인구발전과정을 인구변천모형에 따라 분석하고, 인구변천 단계에 따라 사회복지가 어떻게 발전해 나왔는지를 주로 사회복지 법규를 통해 규명하고 있다. 다음 각 단계별 법규와 사회보장비 지출을 검토하여 스웨덴의 복지발달과정의 이념을 규명한 후, 한국의 사회복지정책이 어떤 방향을 나가야 할지를 제시하고 있다. 연구결과 스웨덴에 비해 한국의 사회보장비지출은 절대 부족상태이며, 스웨덴이 보편주의적 서비스를 강조하는데 비해 한국은 특수집단에 대한 서비스를 강조하고 있음이 부각되었다. 또 한국은 특수한 역사적, 문화적 요인에 의해 보훈계통의 비용이 지불되고 있다. 이 연구의 정책적 함의는 한국사회도 앞으로 소극적인 복지정책보다는 스웨덴에서 처럼 보편주의, 생산주의 및 가정복지를 바탕으로 한 복지민주주의 정책에 대한 적극적인 자세가 필요함을 제시하고 있다.

• Nutrition Research and Practice
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• 제2권4호
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• pp.234-239
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• 2008

The purpose of this study was to investigate the effects of green tea ingestion on hepatocarcinogenesis before and after its initiation. Male Sprague-Dawley rats were fed an AIN76A diet with or without green tea. Initiation was induced by a single dose (200 mg/kg) of diethylnitrosamine at week 4 and 0.02% (w/w) 2-acetylaminofluorene was supplied in the diets. The control group had free access to water for 13 weeks (CTR13). Tea infusion was provided from the beginning of the experiment for 13 weeks (PRE13) or from the post-initiation stage until week 13 (POST13). Three other groups (CTR24, PRE24 and POST24) were added to examine the longer-term effects (24 weeks) with the same experimental design. The percentage area of liver sections that were positive for hepatic placental glutathione S-transferase (GST-P), which was used as a marker of preneoplastic lesions, was smaller in PRE13 ($20.2{\pm}5.0%$, $mean{\pm}SD$) and POST13 ($26.0{\pm}4.8%$) than in CTR13 ($33.2{\pm}5.8%$, p<0.05). Over the longer period, the GST-P lesions were significantly smaller for both PRE24 and POST24 ($21.6{\pm}8.5%$ and $22.2{\pm}4.0%$, respectively) than for CTR24 ($28.6{\pm}5.1%$, p<0.05), but there was no significant difference between PRE24 and POST24. The liver content of thiobarbituric acid reactive substances was significantly lower in the tea groups than in the controls (p<0.05). However, no significant differences were observed among groups of GST activity. The results show that tea consumption exhibits a stronger short-term initiation-inhibiting ability in liver carcinogenesis, but over a longer period, the preventive effects of green tea ingestion do not differ in post- and pre-initiation.

• 한국콘텐츠학회논문지
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• 제16권5호
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• pp.668-685
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• 2016

부모가 분노를 잘 조절하지 못할 경우 자녀에게 부정적인 영향을 끼칠 수 있으므로 부모에게는 분노조절 능력이 매우 필요하다. 본 연구는 초등학생 부모를 대상으로 분노조절 능력을 향상시켜 부모 역할 수행에 도움을 줄 수 있는 부모교육 프로그램을 개발하는 것이다. 프로그램의 개발은 분석, 설계, 개발, 실행, 평가의 과정을 거쳤다. 분석 단계에서는 관련 문헌을 고찰하여 분노조절 능력을 향상시킬 수 있는 방법을 알아 보았다. 설계 단계에서는 차시별 학습 목표를 설정하였으며 그에 따라 교육내용을 선정하였다. 개발 단계에서는 1차 2시간씩 8차의 교육활동을 구성하고 전문가로부터 내용 타당성을 검토 받았다. 실행 단계에서는 주 1차씩 8차에 걸쳐 프로그램을 적용하였다. 마지막으로 평가 단계에서는 프로그램의 효과를 평가하여 내용을 보완하였다. 프로그램의 평가는 양적 방법과 질적 방법을 병행하였다. 양적 방법은 사전 사후 비교를 통해 검증하였으며 Wilcoxon Signed Ranks Test로 분석하였다. 질적 방법은 질문지와 면담 방법을 이용하였다. 프로그램 시행 후 참여자들의 사전 사후 비교분석 결과 부모들의 분노조절 능력, 부모효능감 모두에서 유의미한 향상이 있었다. 이는 참여자들이 프로그램 참여 후 직접 기술한 질적 평가내용에서도 확인되었다. 끝으로 연구자는 본 프로그램의 발전 방향을 제시하였다.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2008년 영문 학술대회
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• pp.115-121
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• 2008

A core engine for pre-cooled turbojet engines is designed and its component performances are examined both by CFD analyses and experiments. The engine is designed for a flight demonstration of precooled turbojet engine cycle. The engine uses gas hydrogen as fuel. The external boundary including measurement devices is set within $23cm{\times}23cm$ of rectangular cross section, in order to install the engine downstream of the air intake. The rotation speed is 80000 rpm at design point. Mixed flow compressor is selected to attain high pressure ratio and small diameter by single stage. Reverse type main combustor is selected to reduce the engine diameter and the rotating shaft length. The temperature at main combustor is determined by the temperature limit of non-cooled turbine. High loading turbine is designed to attain high pressure ratio by single stage. The firing test of the core engine is conducted using components of small pre-cooled turbojet engine. Gas hydrogen is injected into the main burner and hot gas is generated to drive the turbine. Air flow rate of the compressor can be modulated by a variable geometry exhaust nozzle, which is connected downstream of the core engine. As a result, 75% rotation speed is attained without hazardous vibration and heat damage. Aerodynamic performances of both compressor and turbine are obtained and evaluated independently.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.149-150
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• 2019

Recently, major public owner and general contractors in Korea are actively preparing and improving BIM manuals and guidelines to effectively apply BIM technology in construction projects. These guideline has a purpose to define the scope of the applying BIM technology to each construction phase and to explain the minimum technology guidance required for the initial stage. In situations where BIM data are to be submitted within a limited time and cost at the design stage, a BIM data preparing process should be carried out in advance to meet the BIM interoperability between the pre and post of construction precess. In this research, we propose the scope of the BIM guidelines to meet and to be considered for the BIM based review of constructability and economic evaluation of Apartment.