• 대한치과기공학회지
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• 제44권2호
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• pp.60-66
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• 2022

Purpose: This study was conducted to investigate how one's motive to choose a major of study, career values, and satisfaction with the major affect immersion within the major. Methods: A self-administered questionnaire on choice of major and career values was completed by 224 students from March 2nd to March 15th of 2022. The collected data were analyzed using several metrics and tests with IBM SPSS Statistics 22.0 software: frequency and percentage, mean, standard deviation, t-test, ANOVA, correlation analysis, and linear regression. Results: The average scores of the motive to choose a major, career values, satisfaction with the major, and immersion in the major were 3.15, 3.91, 3.56, and 3.45, respectively. There were significant correlations between all four variables (p<0.05). Career values and satisfaction with the major positively influenced a student's immersion in that major; the explanatory power of the model was 77% (p<0.01). Conclusion: The department should offer education on career values to further increase the immersion of dental technician students within their chosen major.

• 한국조경학회지
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• 제37권3호
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• pp.61-68
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• 2009

3차원 몰입형 시뮬레이션이나 입체영상 기술이 개발되면서 경관을 표현하는 도구로 사용이 확산되고 있다. 이에 본 연구는 가시환경과 투사방식의 차이에 따른 경관선호도 분석을 실시하여 가로경관 평가도구로써 곡면 스크린 방식의 몰입형 입체영상의 활용 가능성을 검토하였다. 연구를 위해 서울의 50m 폭원 강남대로를 선정하여 컴퓨터그래픽으로 시뮬레이션을 제작하였다. 시뮬레이션은 가시 환경과 투사방식을 달리하여 경관선호도를 설문조사하였다. 시뮬레이션의 가시환경은 몰입과 비몰입, 투사방식은 입체와 평면영상으로 구분하였다. 요인분석과 t-test 등의 통계분석을 거쳐 가시환경과 투사방식의 차이에 따른 경관특성을 비교하였다. 연구결과는 다음과 같다. 첫째, 몰입이나 비몰입 환경에 따라 경관특성의 차이가 뚜렷하게 나타났다. 몰입형의 시뮬레이션을 이용하면 관찰자가 다양성 요인, 개방성 요인, 공간감 요인에 대해 평가하기가 비교적 용이하여 변별력이 높은 것으로 나타났다. 둘째, 입체나 평면의 투사방식은 변별력을 보이고 있지 않는 것으로 나타났다. 이러한 결과는 경관평가를 위한 시뮬레이션의 제작 및 투사에 있어서 관찰자가 몰입을 할 수 있는 시야각까지 화면을 확장하여 몰입감을 높이는 것이 중요하다는 것을 시사한다. 본 연구는 경관평가 도구로써의 몰입형 시뮬레이션의 효용성을 검토하기 위한 연구로 가로경관의 많은 요소들을 통제하게 됨으로써 변별력을 크게 갖지 못했다는 한계가 있다. 추후 가로폭원, 가로폭원 : 건물높이비 등 다양한 환경에 대해 입체영상에 대한 세밀한 비교 검증이 필요할 것으로 보인다.

• Journal of Mechanical Science and Technology
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• 제17권7호
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• pp.1063-1072
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• 2003

Direct immersion cooling has been considered as one of the promising methods to cool high power density chips. A fluorocarbon liquid such as FC-72, which is chemically and electrically compatible with microelectronic components, is known to be a proper coolant for direct immersion cooling. However, boiling in this dielectric fluid is characterized by its small value of the critical heat flux. In this experimental study, we tried to enhance the critical heat flux by increasing the nucleate boiling area in the heat spreader (Conductive Immersion Cooling Module). Heat nux of 2 MW/㎡ was successfully removed at the heat source temperature below 78$^{\circ}C$ in FC-72. Some modified boiling curves at high heat flux were obtained from these modules. Also, the concept of conduction path length is very important in enhancing the critical heat flux by increasing the heat spreader surface area where nucleate boiling occurs.

• 한국컴퓨터정보학회논문지
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• 제29권3호
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• pp.155-163
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• 2024

본 연구는 간호대학생의 공감능력과 의사소통능력 및 전공몰입간의 관련성을 파악하고, 전공몰입 영향 요인을 확인하기 위해 실시하였다. 연구대상은 G도 지역 소재 1개 대학교 간호대학생 247명으로 자료수집은 2023년 11월 20일부터 12월 1일까지 실시하였다. 자료 분석은 SPSS 22.0을 이용한 기술통계, t-test, one-way ANOVA 및 Scheffe test, 피어슨 상관계수, 다중회귀분석을 실시하였다. 대상자의 공감능력은 3.49점, 의사소통능력은 3.64점 및 전공몰입은 3.61점이었다. 전공몰입은 공감능력 및 의사소통능력과 양의 상관관계가 있으며, 전공몰입에 영향을 미치는 요인은 전공만족과 의사소통능력으로 설명력은 42.9%이었다. 간호대학생의 전공몰입 향상을 위한 학습활동의 방향설정 및 다양한 비교과 프로그램의 개발과 적용이 요구된다.

• KIEE International Transactions on Power Engineering
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• 제4A권4호
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• pp.171-177
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• 2004

In the current age of the information oriented society in which we live, many people use PCs and are dependant on the databases provided by the network server. However, online data can be missed during the occurrence of a blackout and furthermore, power failure can greatly effect Power Quality. This has resulted in the trend of using interruption-free live-line work when trouble occurs in a power system. However, 83% of the population receives an electric shock experience when a laborer is performing interruption-free live-line work. In the interruption-free method, education and training problems have been pinpointed. However, there are few instructors to implement the necessary training. Furthermore, the trainees undergo only a short training period of just 4 weeks. In this paper, to develop a method with no restrictions on time and place and to ensure a reduction in the misuse of materials, immersion type virtual reality (or environment) technology is used. The users of a 3D immersion type VR training system can interact with the system by performing the equivalent action in a safe environment. Thus, it can be valuable to apply this training system to such dangerous work as 'Interruption-free live-line work exchanging COS (Cut-Out-Switch)'. In this program, the user carries out work according to instructions displayed through the window and speaker and cannot perform other tasks until each part of the task is completed in the proper sequence. The workers using this system can utilize their hands and viewpoint movement since they are in a real environment but the trainee cannot use all parts and senses of a real body with the current VR technology. Despite these weak points, when we consider the trends of improvement in electrical devices and communication technology, we can say that 3D graphic VR application has high potentiality.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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• pp.151-151
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• 2012

A new plasma process, i.e., the combination of PIII&D and HIPIMS, was developed to implant non-gaseous ions into materials surface. HIPIMS is a special mode of operation of pulsed-DC magnetron sputtering, in which high pulsed DC power exceeding ~1 kW/$cm^2$ of its peak power density is applied to the magnetron sputtering target while the average power density remains manageable to the cooling capacity of the equipment by using a very small duty ratio of operation. Due to the high peak power density applied to the sputtering target, a large fraction of sputtered atoms is ionized. If the negative high voltage pulse applied to the sample stage in PIII&D system is synchronized with the pulsed plasma of sputtered target material by HIPIMS operation, the implantation of non-gaseous ions can be successfully accomplished. The new process has great advantage that thin film deposition and non-gaseous ion implantation along with in-situ film modification can be achieved in a single plasma chamber. Even broader application areas of PIII&D technology are believed to be envisaged by this newly developed process. In one application of non-gaseous plasma immersion ion implantation, Ge ions were implanted into SiO2 thin film at 60 keV to form Ge quantum dots embedded in SiO2 dielectric material. The crystalline Ge quantum dots were shown to be 5~10 nm in size and well dispersed in SiO2 matrix. In another application, Ag ions were implanted into SS-304 substrate to endow the anti-microbial property of the surface. Yet another bio-application was Mg ion implantation into Ti to improve its osteointegration property for bone implants. Catalyst is another promising application field of nongaseous plasma immersion ion implantation because ion implantation results in atomically dispersed catalytic agents with high surface to volume ratio. Pt ions were implanted into the surface of Al2O3 catalytic supporter and its H2 generation property was measured for DME reforming catalyst. In this talk, a newly developed, non-gaseous plasma immersion ion implantation technique and its applications would be shown and discussed.

• 한국구조물진단유지관리공학회 논문집
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• 제27권5호
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• pp.16-22
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• 2023

이 연구는 원전 콘크리트 배합설계를 모사한 콘크리트 시험체에 대하여 염수침지 실험을 수행하였으며, 시험체 깊이에 따른 염화물량과 XRF 성분의 상관관계를 분석하였다. 원전 콘크리트의 표면부의 염화물량은 염수 침지기간이 증가함에 따라 소폭 증가하였으나, 깊이 5.5 mm 이상의 콘크리트 시험체 내부 염화물량은 염수 침지기간이 증가함에 증가하는 경향이 뚜렷하게 나타났다. 콘크리트의 염화물량과 XRF 성분의 상관관계 분석결과, OPC 배합과 비교하여 FA가 20% 치환된 배합은 XRF 성분분석을 통한 Cl 이온의 구성비율과 염해저항성 평가결과의 상관관계가 매우 높게 나타났다. 이에 따라 FA가 20% 치환된 원전 콘크리트 배합에서는 반복적인 데이터 누적을 통해 XRF 성분분석을 통하여 염소이온분석 및 염해저항성능 평가가 가능함을 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 추계학술대회 논문집 전기물성,응용부문
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• pp.198-200
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• 2003

In this paper, electrical characteristics of EP(engineering plastic) studies for the purpose of electrical insulation materials. A base resin of the EP are Polyamide and Polyphthalamide. And filler is Glass Fibre. Electrical characteristics of EP represents volume resistivity, arc resistance and breakdown voltage according to glass fiber contents. We compare before water immersion and after water immersion. As the results of experiments, Polyphthalamide has good characteristics of insulation material rather than Polyamide as an insulator for electrical power system.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2004년도 춘계학술대회 논문집
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• pp.546-549
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• 2004

This paper describes the electrical characteristics of the polymer lightning arresters(L.As) used to protect distribution lines and power facilities from surge. For the relative comparison, the characteristics assessment was done for 2 states of L.As before and after water immersion treatment. The L.As for the comparative test were immersed with water of $95[^{\circ}C]$ considered a severe condition. After the immersion treatment, the assessment was carried out for material analyses in chemical structure(FTIR : fourier transform infrared spectrophotometer). Electrical performance measured insulation resistance measurement, leakage current measurement, critical operation voltage measurement etc.. In addition to, the results were compared with those for the L.As deteriorated in the field. Thus, the accelerative deterioration degree of polymer materials by immersion treatment was evaluated, by which the structural defects of the polymer L.As could be inferred.

• 동력기계공학회지
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• 제20권3호
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• pp.43-50
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• 2016

The current study was carried to understand the immersion characteristics and mechanical properties of heat treated stainless steels. Stainless steels (STS310S, STS316L and STS347H) were thermally treated at temperature ranges from 480 to $720^{\circ}C$. Nominal stress was determined to be slightly different depending on the heat treatment temperature. The Cr concentration in STS310S was increased at the temperatures of 600 and $660^{\circ}C$, whereas the Cr concentration in STS316L and STS347H were almost constant regardless of heat treatment temperatures. Vickers hardness was found larger as a thermal treatment temperature was increased. Immersion tests of the stainless steels were also carried out in acidic solution and alkaline solution for 240 hours. Among three different stainless steels, the pitting was detected in the acidic solution, not in the alkaline solution. The pitting of STS347H was occurred more than STS310S and STS316L.