• 설비공학논문집
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• 제25권3호
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• pp.126-130
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• 2013

In this study, a shape-stabilized phase change material (SSPCM) was prepared by octadecane and exfoliated graphite nanoplate (xGnP) in a vacuum, to improve thermal storage performance. The octadecane as an organic phase change material (PCM) is very stable against phase separation of PCM, and has the proper temperature range for thermal comfort in the building; and the xGnP is a porous carbon nano-material. Scanning electron microscope (SEM) and Fourier transformation infrared spectrophotometer (FT-IR) were used to confirm the chemical and physical stability of the Ocatadecane/xGnP SSPCM. In addition, thermal properties were determined by Deferential scanning calorimeter (DSC), and Thermogravimetric analysis (TGA). The specific heat of Octadecane/xGnP SSPCM was $14.1J/g{\cdot}K$ at $31.3^{\circ}C$. The melting temperature ranges of melting and freezing were found to be $26{\sim}35^{\circ}C$ and $26{\sim}19^{\circ}C$, respectively. At this time, the latent heats of melting and freezing were 110.9 J/g and 104.5 J/g, respectively. The Octadecane was impregnated into xGnP by as much as about 56.0% of the Octadecane/xGnP SSPCM's mass fraction.

• 한국융합학회논문지
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• 제11권12호
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• pp.137-145
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• 2020

본 연구는 중국의 문화 성향이 국내 중국인 집단거주지역에서 물리적 건조환경의 변화에 대한 영향과 두 요소간 연관성을 분석하고자 한다. 이를 위해서 국가의 문화를 정량적으로 정의하고 비교할 수 있는 호프스테드의 cultural dimension 이론을 활용하여 중국의 문화 성향을 조사하고, 선행연구를 통한 선정한 환경평가요소를 기준으로 대상지를 실증조사하고 문화 성향과의 연관성을 분석하였다. 본 연구를 통해 중국인의 집단주의적이고 불확실성회피하는 성향이 대림2동의 중국인 집단거주지역의 건조 환경 형성과 변화에 영향을 미친 것을 확인하였다. 본 연구는 이주민 공동체의 문화 성향이 집단거주지 형성과 변화에 영향을 미친다는 것을 확인한 것에 의의가 있으며 이를 통해 차이나타운을 포함한 다양한 이주민 공동체마다 적합한 정책을 마련하는데 기초자료로 활용될 수 있을 것이다.

• 한국토양비료학회지
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• 제46권5호
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• pp.303-307
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• 2013

Research reports on soil during the years from 1906 to 2012 have been analyzed to understand the role and pattern of soil research in agriculture. The number of research reports in relation with the key word of soils were 2,211 cases and classified in accordance with the criteria of research area, research subject, and research place of report papers. During the 40 years from 1906 to 1946, research work on soil chemistry was reached 62%, highest in the research area. In the case of research subject, research reports on soil fertility and soil nutrients was highest as 42.2%, and the next subject on soil salt and desalinization was about 19.5%. Research places were in the order of paddy as 34.1%, upland as 23.7%, and reclaimed soil as 22.5%. From 1953 to 2012 during 60 years, in the research area report papers were mainly concentrated on chemistry area as 32% and the next was physics as 26%, and environment as 12%. In the case of research subject during the same period, nutrient management report was reached 21.1%, and soil improvement on chemical and physical properties for optimum crop growth was 11.9%. Soil survey and data base establishment report was 8.6%. Research place were in the order of upland as 34.9%, paddy as 25.7%, and vinyl house as 12.5%, which showed reversed pattern compared to that of before 40 years.

• 한국학교ㆍ지역보건교육학회지
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• 제17권1호
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• pp.59-73
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• 2016

Objectives: The working environment affects employees' physical and mental aspects, and has a deep associations with depression. The purposes of this study are to investigate how hazardous environment working experience impacts on depression, to provide rationale and practical implications for reducing depression and drinking. Methods: This study targeted 215 dental hygiene students from 3 universities located in Gyeonggi-do from November 30 to December 4, 2015. We analyzed the data with frequency analysis, descriptive statistics, t-test. One-way ANOVA, Pearson correlation coefficient, Regression analysis by using SPSS. Results: This study showed that experience working in hazardous environments increased depression and alcohol drinking, on the other hand alcohol drinking reduced depression. In addition, experience working in hazardous environments effected on depression indirectly through mediating of drinking, subjective health had not role of Moderating Effects between experience working in hazardous environments and depression. Conclusions: In order to reduce workers' depression and alcohol, the improvements of harmful environment are needed. For this governments and local governments should efforts to support enhancing workplace environment, to develop model of standard work environment, and to change employers' awareness on the harmful environment.

• 대한인간공학회지
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• 제17권1호
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• pp.79-89
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• 1998

This study describes the research contents, strategies, and applications of simulator for measuring and evaluating human sensibility. The simulator is the integrated experiment facility which can change the physical environment artificially to measure and grasp the reaction feature of human sensibility for the products and environments. The design technique consists of two parts; development of technique to present the mock environment related to sensibility elements and development of software to measure and evaluate sensibility physiologically and psychologically. The simulator can be utilized for evaluating the main industrial products and environments. Therefore, the simulator can increase the added-value of the product and environment, and also contribute to the improvement of quality of human life.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 1998년도 추계학술발표 논문집
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• pp.88-93
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• 1998

The purpose of this study was to examine theory about indoor thermal comfort-environment as well as to determine thermal sensation and physical responses for men in summer and winter indoor environment, under various air temperature and relative humidity, with male university students. Subjective Evaluation, Heart rate(Electrocardiogram, ECG), Electroencephalo gram(EEG) were examined. We found that comfort of people was achieved at SET*. 24.7$^{\circ}C$, -0.82${\alpha}$-wave) both in summer and in winter.

• 한국비블리아학회지
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• 제17권1호
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• pp.325-343
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• 2006

유비쿼터스 정보 환경의 도래와 함께 전통적으로 도서관 건물을 중심으로 이루어지던 도서관 서비스 공간도 변화하고 있다. 본 연구에서는 유비쿼터스 정보 환경에서 도서관 공간의 의의와 범위 및 특징을 문헌연구와 국내외 사례 연구, 그리고 학부생을 대상으로 한 포커스그룹인터뷰 등을 통하여 조사하였다. 연구 결과 도서관이 제공하는 물리적 장소는 이용자에게 여전히 중요한 공간임을 확인하고, 유비쿼터스 공간의 개방성과 상호 작용성을 고려한 정보 공간 운영의 필요성을 제안하였다.

• 한국운동역학회지
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• 제30권1호
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• pp.111-119
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• 2020

Objective: The purpose of this study is to apply exercise learning effect to various subjects through training effect and information accumulation based on verification of the effect on dumbbell curl exercises applied with virtual reality. Method: To analyze the effect on the dumbbell curl exercise in the virtual environment, a total of 20 persons with 10 males and 10 females who does not have orthopedics diseases were selected. The dumbbell weight of the subjects was set to a weight of 70% strength of 1RM. At this time, the virtual environment situation was set to four types; presence/absence of virtual environment, preferred colors, and unfavorable colors to perform dumbbell curl exercise. The anaysis of muscle activity was conducted by adhering four surface electrodes (Biceps Brachii, Triceps Brachii, Brachioradialis Muscle, Extensor Carpi Radialis Longus Muscle) on the right upper limbs. Independent sample t-test using SPSS (24.0) program was carried out to analyze average values and standard deviations for each variable depending on the presence/absence of virtual environments and changes in color (preferred colors, unfavorable colors) and the level of significance was set to a=.05. Results: In the eccentric contraction, males showed high muscle activity in the Biceps Brachii under virtual reality. On the other hand, females had high muscle activity in the Biceps Brachii in the absence of virtual reality. Also, in case of a change of colors in the virtual environment, females had the high muscle activity in the unfavorable color in the eccentric contraction. Conclusion: During the dumbbell curl exercise, results of different exercises present depending on gender. When males put VR on and performs a basic dumbbell curl exercise, the effect of Biceps presents Brachii for them while exercising in unfavorable colors. However, since it is the basic research data of muscle exercise using virtual reality, it is necessary to verify whether or not it is effective for myopachynsis through long-term training rather than unity.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2017년도 춘계 종합학술대회 논문집
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• pp.337-338
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• 2017

본 연구는 대학생의 교양무용 수업에 따른 신체활동 및 신체움직임의 변화 연구를 하였다. 연구방법은 실제사례를 통한 연구자의 참여관찰과 참여자의 심층면담자료, 검토, 자기보고서 분석을 제시하여 결과를 제시하였다. 첫째, 교양무용 수업에 참여한 대학생들의 신체움직임에 대한 개인적 특성에 따른 무용 인식변화가 나타났다. 둘째, 신체 움직임의 집중도가 높아질수록 자신감과 만족감에 영향을 미친다. 또한 여러 가지 각자가 가지고 있는 스트레스의 요인들을 해소할 수 있는 효과를 느껴다는 결과가 나타났다.

• 한국물환경학회지
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• 제27권1호
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• pp.115-119
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• 2011

The mobility of groundwater in the soil environment has an important role in the soil environment and absorption of plant. Therefore, studies on the mobility of groundwater considering the physical and chemical properties of soil is very important. In this study, movement of water due to change in soil particle size were observed by capillary rise. The height of the capillaries was measured according to capillary diameter, temperature and solution concentration. The inner diameter of each capillary itself is 0.012, 0.016, 0.024, 0.027 cm, and experiments were performed at $22^{\circ}C$. As a result, the height of the capillaries decreased with increasing capillary diameter, and the solution temperature but increased with increasing concentration. Changes in the height of the capillaries are interpreted to related with surface tension by the Young-Laplace equation. Also on the mobility of groundwater, the increase of water and soil temperatures can be significant factors caused by ion strength and global warming as well as pores in the soil particles. The results of this study is considered to provide the basic data on the behavior of groundwater in the soil environment.