유로피움-활성화 칼슘 알루미늄 실리케이트 형광체 연구

황정하,박주석,장보윤,남산,김준수,유순재,Hwang, Jung-Ha,Park, Ju-Seok,Jang, Bo-Yun,Nahm, Sahn,Kim, Joon-Soo,Yu, Soon-Jae 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.11

Europium$(Eu^{2+}\;or\;Eu^{3+})$-activated calcium aluminium silicate phosphors were synthesized for the first time and the structures and luminescence characteristics of these phosphors were investigated. The phosphors in this study emitted blue, green, and even red light depending on the starting milterials and annealing conditions for synthesis. In addition, the structure was also changed when the different starting materials were used. When $CaCO_3$ was used as a starting material, tetragonal $Ca_2Al_2SiO_7$ was formed. However, pure green light was emitted when the annealing was conducted in reduced atmosphere and red one was emitted by annealing in air. In the case of $CaSiO_3$ as a starting material, triclinic $CaAl_2Si_2O_8$ was formed and only pure blue emission was observed. Moreover, this blue phosphor exhibited higher intensity than that of commercial YAG:Ce phosphor, which showed the possibility of application on the phosphor for new light source such as a UV-LED.

작업치료과 학생들이 생각하는 동아리 여가활동의 의미

황정하 ( Jung Ha Hwang ),홍재란 ( Jae Ran Hong ) 한국고령친화건강정책학회 2012 대한고령친화산업학회지 Vol.4 No.1

연구목적: 본 연구는 질적 연구방법을 통하여 대학생들이 동아리여가활동에 대해 느끼는 인식을 구체적이고 심층적으로 분석하기 위한 것을 목적으로 한다. 연구방법: 2011년 5월 15일부터 6월 10일까지 이루어졌으며 자료수집방법은 심층면담을 주로 사용하였다. 분석방법은 Giorgi의 자료분석 절차에 따라 의미단위를 나누고 이를 학문적 용어로 전환하여 기술하였고, 이 중 유사한 기술을 묶어 구성요소로 범주화하였다. 연구결과: 분석 결과, 5개의 구성요소와 12개의 하위 구성요소를 도출하였으며, 연구결과에서 경험의 구성요소들은<동아리 여가활동을 통한 인간관계 형성>, <생활만족도 향상>, <부정적인 영향>, <삶의 질에 대한 긍정적인 영향>, <동아리 여가활동이 성적에 영향을 미치며 자아실현 성취> 등으로 나타났다. 결론: 이러한 연구 결과를 바탕으로 하여 작업치료과 학생들의 동아리여가활동 인식에 대한 의미를 논의하고 자아개념을 정립시킬 수 있는 여가 교육프로그램 제공이 필요하다. Objective : The aim of this study is to analyze in depth how university undergraduates perceive club activities through the use of quality methods. Methods : Study participants were comprised of undergraduates attending A college in total of three. In-depth interviews were mainly conducted as a means of data collection and it commenced on May 15th, 2011, through to June 10th, 2011. Analyses were performed on the basis of Giorgi`s data analysis procedure, which involved subdividing results into separate meanings, converting those meanings into academic terms for subsequent description and any descriptions that exhibited similarity have been categorized into one component. Researchs : As a result, five components and twelve sub-components were obtained. Experiential components obtained were ``formation of human relationship through club activity``, ``increase in the level of life satisfaction``, ``negative influence``, ``positive influence on the quality of life`` and ``influence of club activity on academic grades, which in turn produces self-realization``. Conclusion : Based on the outcome of this study, the introduction of leisure education programs is required for university undergraduates to provide them with an opportunity to discuss their perception of undertaking a club activity and to correct their self-concept.

신축공동주택 실내마감자재의 HCHO와 TVOC 방출특성

황정하(Jung-Ha Hwang),박태신(Tae-Shin Park) 한국생활환경학회 2008 한국생활환경학회지 Vol.15 No.2

In this study, we investigated the densities of HCHO and TVOC emissions polluting the indoor air in newly-built apartment houses. We used on-site measurements, as well as compared and analyzed the changes in the amount of emissions of indoor air-polluting materials according to indoor closing materials through experiments using small chambers. (1) The results from on-site measurement of newly-built apartment houses indicated that the amount of HCHO emission remained below the environmental standards, whereas the amount of TVOC emission exceeded that of the environmental standard value (500 ㎍/㎥), at a high of 79.2 ㎡ and 105.6 ㎡, and a low of 141.9 ㎡. (2) According to the results of the analysis of the amount of emitted pollutants in indoor closing materials through small chamber experiments, the emitted amount of pollutants in all the closing materials reached the highest point on the date of installation, and which gradually decreased for the succeeding 10 days. Theretore, it would be necessary for residents to move into the apartments at least 10 days after indoor closing materials are installed in the site concerned.

바닥취출 공조방식을 적용한 기존 공연장의 열환경 개선효과

황정하(Jung-ha Hwang),이용호(Young-ho Lee) 한국생활환경학회 2002 한국생활환경학회지 Vol.9 No.4

This study focused on the ceiling supply air conditioning system installed in auditoriums with 1,000 seats or less and analyzed, by means of computer simulation, the temperature and velocity distribution together with the predicted mean vote (PMV) of the occupancy zone. The existing ceiling supply air conditioning system has a nozzle air inlet in the ceiling through which air is released. This airflow exceeded the allowable velocity in the occupancy zone I meter above the floor surface, causing a draft. The indoor temperature was 24.7℃ when cooled, 1.3℃ lower than the set air temperature (SAT), and 25.5℃ when heated, 3.5℃ higher than the set air temperature. The Predicted Mean Vote (PMV) of the ceiling supply air conditioning system in the rear seating area of the first floor where the ceiling is relatively low was -0.1~-0.61 when cooled and -0.2~-0.53 when heated. These figures are than those within the comfort zone, indicating the presence of some level of discomfort. As means of improving the ceiling supply air conditioning system, this thesis investigated three systems: the floor supply air ceiling suction system (ALT-1), floor supply air wall suction system (ALT-2), and floor central supply air wall suction system (ALT-3). The most promising data were extracted from the floor supply air wall suction system (ALT-2), known for its superior performance in the thermal environment, when the existing cooling and heating system capacity was reduced by 50%. showed that the velocity distribution in the occupancy zone was within the allowable limit 0.14~0.24 ㎧ when cooled and 0.1~0.28 ㎧ when heated. These levels in the occupancy zone lie within the comfort zone.

상상훈련이 뇌종양 환자의 균형에 미치는 영향: 단일사례연구

황정하 ( Jung Ha Hwang ) 한국고령친화건강정책학회 2011 대한고령친화산업학회지 Vol.3 No.2

연구목적: 본 연구의 목적은 중추신경계 질환 중 하나인 뇌종양 환자에게 상상훈련(image training)을 적용하여 균형능력에 어떠한 영향을 미치는지를 알아보기 위한 것이다. 연구방법: 본 연구는 정적 균형능력에 문제를 보이는 한 명의 대상에 대해 AB설계를 사용하여 2010년 11월 8일부터 2011년 1월 21일까지 11주간 주 5회씩 총 20회기를 실시하였다. 상상훈련은 Tetrax, BBS를 사용하여 결과를 측정하였다. 연구결과: 1. BBS 전 · 후의 균형능력 변화 결과로 36.4점, 치료 과정에서는 41.25점, 6주 후 사후 검정에서는 35.6점을 획득하였다. 2. Tetrax 전 · 후와 사후검정 균형능력 변화 결과로 총 6개의 하위항목 중 NC는 기초선 과정에서 26.74점, 치료과정에서 23.44점, 6주 후 사후검정에서 21.55점을 나타내었다. PO는 기초선 과정에서 19.09점, 치료 과정17.09점, 6주 후 사후검정에서 19.94점을 나타내었다. PC는 기초선 과정에서 74.21점, 치료 과정 48.58점, 6주 후 사후검정에서 53.48점을 나타내었다. 마지막으로 HL는 기초선과정에서 28.04점, 치료 과정 24.69점, 6주 후 사후검정에서 26.4점을 나타내었다. 결론: 본 연구 결과로 상상훈련 적용이 균형능력에 영향을 미친다고 볼 수 있었다. 상상훈련 적용으로 균형능력이 좋아진다면 환자의 일상생활이 보다 효율적으로 이루어 질수 있을 것이다. Objective : The purpose of this study is to inquire into the effects of image training on balance if it was to be applied to patients with a brainstem tumor which is one of several central nervous system( CNS) disorders. Methods : The current study employs the AB design on one subject five times per week, a total of twenty, over a period of eleven weeks from November 2010, January 2011, who is suspected to have difficulty maintaining static balance. Imaginary training outcomes were determined using Tetrax and BBS. Results : (1) Using BBS, 36.4, 41.25 and 35.6 points were obtained for baseline, treatment and follow- up after six weeks respectively. (2) During Tetrax testing, NC exhibited 26.74, 23.44 and 21.55 points, PO exhibited 19.09, 17.09 and 19.94 points, PC exhibited 74.21, 48.58 and 53.48 points, and HL exhibited 28.04, 24.69 and 26.4 points for baseline, treatment and follow-up after six weeks respectively. Conclusion : As a result of this study, it can be concluded that imaginary training could have influence on balance. Therefore, patients` activities of daily living will become more efficient if imaginary training does have positive effects on balance.

천장형 냉방기를 이용한 교실의 온열환경 개선에 관한 연구

황정하(Jung-ha Hwang),이용호(Yong-ho Lee),윤준진(Jun-Jin Yun) 한국생활환경학회 2006 한국생활환경학회지 Vol.13 No.1

The purpose of this study is to deduce the optimal operating plan for the classroom ceiling air conditioning system based on air supply variables at the time of cooling operation. To carry out this objective, measuring experiment and computational fluid dynamics (CFD) were performed with variables including supply air temperature, air supply volume and air supply angle of a ceiling air conditioning system. Based on a comparison of the results, classroom temperature and velocity distribution are analyzed, so the air volume distribution can be improved according to the heat generating load of the occupants. Ultimately, through the evaluation and analysis of the occupants' Predicted Mean Vote (PMV), an optimal operating plan for the summer is proposed. Room temperature and velocity distribution stayed in the most stable condition at the temperature setting of 26°C, air supply volume of 4320CMH, and air supply angle of 30°, With regard to the improvement plans based on the occupants' heat generating load, the air supply volume is reduced in the less populated front area, and raised in the more populated right and left sides of the room. Among the proposed improvement plans [ALT-3] in which the air supply volume is reduced by 40% in the front area and 20% at the south and north, exhibited the least difference in room temperature. The occupants' PMV stayed in the comfortable zone ± 1, and the occupants feel comfortable in the range of ±0.5 throughout the entire room.

상상연습 프로그램이 뇌졸중 환자의 상지기능 및 일상생활활동에 미치는 효과

황정하 ( Jung Ha Hwang ) 고령자·치매작업치료학회 2013 고령자.치매작업치료학회지 Vol.7 No.1

본 연구는 상상연습 프로그램이 뇌졸중 환자의 상지 및 일상생활활동에 미치는 영향을 알아보고자 한다. 뇌졸중 환자 14명을 대상으로 무작위 배정을 통해 실험군과 대조군을 각각 7명씩 할당하였다. 실험군은 상상연습 프로그램(상상연습+과제지향적 훈련)과 전통적 재활치료를 5주 동안 주 5일, 1일 1 회, 1회 30분 동안 제공되었으며, 대조군은 실험군과 동일한 회기동안 전통적 재활치료가 제공되었다. 상지기능을 측정하기 위해 MFT, BBT, MAL, 악력검사를 사용하였으며, 일상생활활동을 측정하기 위해 이재신(2005)이 개발한 일상생활 수행검사를 사용하여 평가하였다. 상상연습 프로그램과 전통적 재활치료를 적용한 실험군은 상지기능 및 일상생활 수행검사의 모든평가에서 유의한 차이를 보인 반면(p<.05), 전통적 재활치료만 실시한 대조군은 모든 평가 항목에서 점수향상은 보였으나, MAL(움직임의 질) 항목에서만 유의한 변화가 나타났다. 본 연구는 상상연습 프로그램이 뇌졸중 환자의 상지기능과 일상생활활동 수행능력에 효과적임을 알 수 있었다. The purpose of this study was to investigate the effect of mental practice on the upper extremity and ADL(Activity Daily Living) in person with stroke. Participants were randomly allocated to two groups: experimental(n=7) and control(n=7). The patients were randomly divided into an experimental group and a control group. Both groups participated in mental practice program 5 session 30 minutes per week for 4 weeks. The Upper extremity was measured by MFT, BBT, MAL(Amount of Use; AOU, Quality of Movement; QOM), Grip strengthening. Jae-Shin(2005) development activities of daily living tests were evaluated using. As a result of the analysis of the comparison of the differences between two groups, in respect the areas of upper extremity function, ADL, there were significant differences. Experimental group assessment of upper extremity function and ADL examination showed significant difference(p<.05). Scores showed the improvement in the control group at all assessment items or MAL(quality of movement) items only, showed significant changes. This study demonstrated the effectiveness of mental practice program training on the functional recovery of stroke patients by showing an improved performance of upper-limb functionality, activities of daily living.

양측성 상지운동이 뇌졸중 환자의 양손협응 및 일상생활활동에 미치는 영향

황정하 ( Jung Ha Hwang ),김형민 ( Hyoung Min Kim ),이재신 ( Jae Shin Lee ) 고령자·치매작업치료학회 2011 고령자.치매작업치료학회지 Vol.5 No.1

목적: 본 연구의 목적은 양측성 상지운동이 뇌졸중으로 인한 편마비 환자의 양손협응 및 일상생활활동에 미치는 영향을 알아보기 위한 것이다. 연구방법: 본 연구는 개별사례 실험 연구 방법 중 반전연구(reversal design)로 설계되었으며, 뇌졸중 진단을 받은 2명의 성인을 대상으로 총 4주간 실시되었다. 양측성 상지운동은 14일 동안 장구, 북을 사용하여 양손을 동시에 움직일 수 있게 실시하였다. 대상자의 양손 협응능력은 기초선(5회)과 중재기간(14)회, 기초선 회귀(5회) 동안 매회기 Complete Minnetsota Dexterity Test(CMDT)를 사용하여 반복측정하였고, 일상생활활동의 수행 능력은 양측성 상지운동 전·후에 Assessment of Motor and Process Skills(AMPS)를 사용하여 측정하였다. 결과 분석을 위하여 대상자별로 측정된 평가 결과를 평균값과 시각적 그래프를 통하여 제시하였다. 연구결과: 대상자의 양손협응 기능은 기초선 기간보다 중재기간 동안 향상되었으며, 이 향상은 기초선 회귀기간 동안에도 지속되었다. 일상생활활동 수행능력의 치료 전·후를 비교한 결과 대상자 1의 경우 처리기술 능력치 차이는 0.53으로 통계적으로 유의한 변화를 보였고 대상자 2는 운동기술 및 처리기술의 능력치 차이가 각각 0.44와 0.36으로 나타나 임상적으로 의미 있는 향상을 보였다. 결론: 양측성 상지운동은 뇌졸중으로 인한 편마비 환자의 상지 기능을 향상시킬 뿐 만 아니라, 양손 협응 능력을 향상시키는데 효과적이었으며, 그로 인해 일상생활활동의 수행 능력을 향상시키는 것으로 나타났다. Objective: This study is to explore effects of the bilateral coordination and activities of daily living on bilateral upper limb movement for hemiplegia patients caused by stroke. Method: This study was a single-subject experimental research with ABA` design. The subjects were two persons who diagnosed as stroke and this design was performed during four weeks for them. Bilateral upper limb movement was done using Janggu(double-headed drum) and drum for 14 days so that both hands can be moved simultaneously. Bimanual coordination function of subjects was measured during baseline phase(5 sessions: A), Intervention(14sessions: B) and baseline return phase`(5 sessions: A`) using Complete Minnetsota Dexterity Test(CMDT) each session. Performance activities of daily living was measured using Assessment of Motor and Process Skills(AMPS) in Pre-Post Bilateral upper limb movement. For analysis of the results, assessment results measured for each subject were suggested through average values and visual graph. Result: Bimanual coordination function of subjects was more improved during Invention period(B)than baseline phase and this improvement was continued during baseline return phase(A`). From the results of comparison between Pre-Post the treatment of Performance activities of daily living difference in Process skill of subject 1 was 0.53, which means statistically significant change. Differences in Movement skill and Process skill of subject 2 were 0.44 and 0.36 respectively, which means clinically meaningful improvement. Conclusion: Bilateral upper limb movement not only improved upper limb function of hemiplegia patients caused by stroke but also was effective in improving Bimanual coordination, which leads to improvement of performance activities of daily living.

초고층 공동주택의 배기겸용 소형풍력발전 적용을 위한 전력량 측정 실험 연구

박정하(Jung Ha Park),송용우(Yong Woo Song),주정훈(Jung Hoon Ju),박진철(Jin Chul Park),황정하(Jung Ha Hwang) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6

초고층 공동주택의 배기겸용 소형풍력발전 적용을 위한 실측실험 연구

박정하(Jung Ha Park),김진우(Jin Woo Kim),송용우(Yong Woo Song),박진철(Jin Chul Park),황정하(Jung Ha Hwang) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6

This is an elementary study for the application of small-sized exhaust wind power generation to the exhauster at the rooftop of high-rise apartment houses, which performs CFD simulation for the effect of multi-diffuser for exhaust wind velocity amplification and external wind attraction and the experiments on actual mock-ups. The result of this study is summarized as follows. As the result of experiment of multi-diffuser for exhaust and ventilation, the wind velocity increased with a greater number of installations of devices. Influence by the outdoor wind speed was better at the bottom of the exhaust emissions than at the top of the exhaust outlet. Therefore, It is judged that the greater the number of modules is advantageous to increase the discharge of wind speed