• 한국태양에너지학회 논문집
• /
• 제26권2호
• /
• pp.9-18
• /
• 2006

In this paper, the thermodynamic performance of OTEC cycle was examined. Computer simulation programs were developed for simple Rankine cycle, regenerative Rankine cycle, Kalina cycle, open cycle and hybrid cycle. For the simple Rankine cycle, the results show that newly developed fluids such as R410A and R32 that do not cause stratospheric ozone layer depletion perform as well as R22 and ammonia. Also, simple Rankine cycle OTEC power plant can practically generate electricity when the difference in warm and cold sea water inlet temperatures are greater than $14^{\circ}C$. The regenerative Rankine cycle showed a 1.5 to 2% increase in energy efficiency compared to the simple Rankine cycle while the Kalina cycle employing ammonia/water mixture showed a 2-to-3% increase in energy efficiency, and the overall cycle efficiencies of hybrid cycle and open cycle were 3.35% and 4.86%, respectively.

• 대한통합의학회지
• /
• 제11권3호
• /
• pp.137-145
• /
• 2023

Purpose : The purpose of this study was to identify the degree of work ethics of an occupational therapist and examine the correlation between work ethics and organizational commitment. In this study, we aimed to investigate the effects of occupational therapists' work ethics on organizational commitment. Through this study, we aim to determine the importance of work ethics and find a way to improve organizational commitment in occupational therapists. Methods : We conducted nationwide surveys on occupational therapists working in hospitals and other institutions from April 24, 2023 to May 30, 2023. We evaluated general characteristics, work ethics, and organizational commitment. General characteristics were analyzed using a frequency analysis. Work ethics and organizational commitment were examined using descriptive statistics. The correlation among work ethics and organizational commitment was analyzed using the Pearson correlation coefficient. Additionally, a multiple regression analysis was conducted to identify factors that affected organizational commitment. Results : The results of this study were as follows. First, the average score of work ethics was 3.32 ± .32. Second, a significant positive correlation was observed between work ethics and organizational commitment (p<.01). And as a result of the correlation between work ethics sub-factors and organizational commitment, wasted time (r=.261, p<.01), centrality of work (r=.366, p<.01), morality/ethics (r=.470, p<.01), leisure (r=.189, p<.05), delay of gratification (r=.410, p<.01), hard work (r=.437, p<.01), self-reliance (r=.233, p<.01) showed a statistically significant correlation. Third, the sub-factors of work ethics that influenced organizational commitment, including morality/ethics (𝛽=.302, p<.01), hard work (𝛽=.271, p<.01), and delay of gratification (𝛽=.205, p<.01) were identified. Conclusion : In conclusion, the results of this study underscore the importance of work ethics in influencing organizational commitment. Through this study, we recognized the importance of work ethics, which may serve as basic data to promote work ethics and improvement of organizational commitment.

• Journal of Photoscience
• /
• 제9권2호
• /
• pp.317-319
• /
• 2002

All-optical switching has been demonstrated in bacteriorhodopsin (bR) based on nonlinear intensity induced excited state absorption. The transmission of a cw probe laser beam at 410 nm corresponding to the peak absorption of M state through a bR film is switched by a pulsed pump laser beam at 570 nm that corresponds to the maximum initial 8 state absorption. The switching characteristics have been analyzed using the rate equation approach considering all the six intermediate states (B, K, L, M, N and 0) in the bR photocycle. The switching characteristics are shown to be sensitive to life time of the M state, absorption cross-section of the 8 state at probe wavelength ($\sigma$ $\_$Bp/) and peak pump intensity. It has been shown that the probe laser beam can be completely switched off (100 % modulation) by the pump laser beam at relatively low pump powers, for $\sigma$$\_$Bp/ = O. The switching characteristics have been used to design all-optical NOT, OR, AND and the universal NOR and NAND logic gates for optical computing with two pulsed pump laser beams.

• 한국산학기술학회논문지
• /
• 제17권12호
• /
• pp.107-119
• /
• 2016

본 연구는 기본간호학 이론과목에 팀 기반수업을 적용한 후 간호학생들의 자기주도적 학습, 학업적 자기효능감, 학습만족도에 미치는 효과를 탐색한 서술적 조사연구이다. 연구대상자는 G지역 소재 일개대학 간호학과에 재학중인 2학년 간호학생 104명이었으며, 자료수집은 2016년 3월2일 부터 6월15일까지 실시하였다. 자료는 SPSS 21.0 Program을 이용하여 t-test와 one-way ANOVA, paired t-test, 피어슨 상관관계(Pearson's correlation coefficients) 통계방법을 활용하여 분석하였다. 연구결과를 살펴보면 일반적인 특성에 따른 학습만족도의 차이에서 입학 시 간호사에 대한 생각(F=3.751, p<.05), 기본 간호학 실습수업에 대한 흥미 정도에서 통계적으로 유의한 차이를 보였다(t=4.410, p<.05). 자기주도적 학습은 팀기반 학습적용 전 평균 3.39점에서 적용 후 평균 3.50점으로 0.11점 상승하였으며, 통계적으로 유의한 차이를 나타냈고(t=-2.083, p=<.05), 학업적 자기효능감도 팀기반 학습 적용 후 3.12점에서 3.65점으로 0.53점 상승하였으며, 통계적으로 유의한 차이를 나타냈다(t=-14.175, p=<.001). 팀기반 학습 적용에 대한 학습만족도는 평균 3.73점으로 중간이상으로 나타났고, 팀기반 학습 적용 후 자기주도적 학습은 학업적 자기효능감(r=.512, p<.001), 학습만족도(r=.421, p<.001)와 중간정도 크기의 양의 상관관계를 보였다. 본 연구결과 팀기반 학습은 자기주도적 학습, 학업적 자기효능감, 학습만족도를 높여주는 교수법으로 급변하는 의료환경에서 간호학생들에게 졸업과 동시에 요구되는 임상수행능력을 발휘하고 다양한 간호상황에 대응하여 임상문제를 효과적으로 해결할 수 있는 역량을 함양시킬 수 있는 학습방법임을 입증하였다. 본 연구결과를 근거로 기본간호학 뿐만 아니라 다양한 간호학의 교과목 특성에 맞는 팀기반 학습법을 적용해볼 것을 제언한다.

• 한국응용곤충학회지
• /
• 제5_6권
• /
• pp.47-54
• /
• 1968

벼의 줄무늬잎마름병 방제에 보다 능률적이고 완전한 실효를 얻기 위해 우선 본병에 대한 저항성 검정방법을비교검토하고 장려 품종 중에서 저항성품종을 선발하여 장래 저항성품종 육성의 모체를 제공할 목적으로 410품종에 대하여 저항성검정을 실시하였다. (1) 집단접종과 개체접종법을 비교 검토한 결과 발병률은 집단접종법이 다소 높은 경향이 있어 차이가 있음을 알 수 있다. (2) 발병지수에서 Lacrose는 두 방법이 모두 S였고 Zenith$\cdot$St. No.1$\cdot$St. No. 2$는 R, 나머지는 M로 나타나 같은 경향을 보여 주었다. (3) 병징형은 이병성품종에서는 모두 감수성형인 A형이 많고 저항성품종에서는 반대로 저항성병징형인 C형이 많아 두 방법이 같은 경향을 보여 주였다. (4) 410품종의 저항성검정에서 저항성이(12품종) St. No.1$\cdot$St. No. 2$\cdot$ 신 2호$\cdot$Gulfrosebonnet$\cdot$Arkroe$\cdot$Sunbonnet$\cdot$Zenith$\cdot$이천칠일찰$\cdot$농림 24호$\cdot$오백조계$\cdot$양주밭찰$\cdot$농림나 1호 등이고 남선97$\cdot\;149\cdot\;159\cdot\;216\cdot\265$호, 이황 $243\cdot\;265$, 간척 $5\cdot\;7\cdot\;8\cdot\;10\cdot\;41\cdot\;43\cdot\;47\cdot\;50$호 수원 $56\cdot$77호$\cdot$농림 22호$\cdot\;Cod-4\cdot\;Lacrose\cdot\;$적나 등은 이병성이며, 중간성이 377품종이었다. (5) 숙기별로 볼 때 큰 차이는 없으나, 만생$\cdot$조생$\cdot$중생종의 순으로 저항성이 컸다. (6) 장려품 중에서는 신 2호 외는 거의 중간성이었다.

• 대한치과보철학회지
• /
• 제44권3호
• /
• pp.314-324
• /
• 2006

Statement of problem. Osseointegration is important mechanism of dental implant but it is not easy to evaluate. Indirect measurement is non-invasive and clinically applicable but they need more study about correlation between indirect values and degree of osseointegration. Purpose. The aims of this study were to evaluate the coefficient of correlation between indirect measurement and direct measurement under different healing time, and assessment of effect of initial insertion torque to the implant stability. Material and Methods. 20 rabbits received 3 implants on each side of tibia. Three kinds of implants (machined surface implant, Sandblasted with Large grit and Acid etched implant, Resorbable Blast Media treated implant) were used. During the surgery implant insertion torque were measured with $Osseocare^{TM}$. After the 1, 4, 8, 12 weeks of healing time, animals were sacrificed and stability values (Implant Stability Quotient with $Osstell^{TM}$, removal torque with torque gauge) were measured. Results. The Bone quality of rabbit tibia was classified into 2 groups according to the insertion torque. Resonance frequency analysis (ISQ) and removal torque showed positive correlation until $4^{th}$ week (r=0.555, p=0.040). After $8^{th}$ week (r=0.011, p=0.970) the correlation became weak and it turned negative at $12^{th}$ week (r=-0.074, p=0.801). Insertion torque and ISQ showed changing correlation upon the healing time ($1^{st}$ week: r=0.301, p=0.033, $4^{th}$ week: r=-0.429, p=0.018, $8^{th}$ week: r=0.032, p=0.865, $12^{th}$ week: r=-0.398, p=0.029). Insertion torque and removal torque has positive correlation but it was not statistically significant ($1^{st}$ week: r=0.410, p=0.129, $4^{th}$ week: r=0.156, p=0.578, $8^{th}$ week: r=0.236, p=0.398, $12^{th}$ week: r=0.260, p=0.350). Conclusion. In this study, bone quality may affect the degree of osseointegration positively during healing time and correlation between ISQ and degree of osseointegration can be different according to the healing time and bone quality.

• 한국콘텐츠학회논문지
• /
• 제17권11호
• /
• pp.410-422
• /
• 2017

본 연구의 목적은 만성 폐쇄성 폐질환자(COPD)의 질병관련 지식, 질병태도, 삶의 질 세요인간의 상관관계를 규명하고자 시도되었다. 연구결과 질병관련 지식은 대상자의 교육과 월수입, 주관적 호흡곤란 정도(mMRC), 흡입형 기관지 확장제, 항생제 치료에 따라 유의한 차이가 있었고 질병태도는 월수입, mMRC에 따라 유의한 차이가 있었다. 또한 삶의 질은 연령, 결혼상태, 월수입, 입원상태, 입원경험, 산소사용, 동반질환, mMRC, 흡입형 스테로이드에 따라 유의한 차이가 있었다. 질병관련 지식과 삶의 질(r=-.438, p<.001), 질병태도와 삶의 질(r=.279, p=.001)은 유의한 상관관계가 있는 것으로 나타났다. 따라서 세 요인에 공통적으로 상관성을 보인 변수인 월수입과 mMRC를 파악하는 것이 중요하며, 임상에서 COPD환자의 상태평가시, 객관적 검사결과 뿐만 아니라 mMRC의 사정에 관심을 가지고, 저소득계층을 중심으로 질병관련 지식향상과 긍정적인 태도함량을 위한 다학제간 접근과, 헬스코칭 프로그램을 개발하는 것이 필요하다.

• 설비공학논문집
• /
• 제11권4호
• /
• pp.499-510
• /
• 1999

A computer program was developed for simulating performance(capacity, power consumption and etc.) of air-conditioners using compressor, fin-tube heat exchanger and capillary tube. The program consists of five modules, condenser, evaporator, compressor, capillary tube simulation modules and properties modules of refrigerant and moist air, The present program is focused on R22 only, however can be easily extended for other refrigerants such as R407C and R410A just by adding property modules. The compressor simulation module utilizes performance maps supplied by manufacturers-map-based model. The condenser and evaporator simulation modules are modeled using tube-by-tube method. Simulation results(capacity and power consumption) were compared with calorimeter test results of actual air-conditioners of window and split types, where more than 82% of the data lied within ${\pm}5$% of the predicted results.

• Bulletin of the Korean Chemical Society
• /
• 제33권11호
• /
• pp.3581-3588
• /
• 2012

A new series of acyclic mononuclear gadolinium(III) complexes have been prepared by Schiff-base condensation derived from 5-methylsalicylaldehyde, diethylenetriamine, tris(2-aminoethyl) amine, triethylenetetramine, N,N-bis(3-aminopropyl)ethylene diamine, N,N-bis(aminopropyl) piperazine, and gadolinium nitrate. All the complexes were characterized by elemental and spectral analyses. Electronic spectra of the complexes show azomethine (CH=N) within the range of 410-420 nm. The fluorescence efficiency of Gd(III) ion in the cavity was completely quenched by the higher chain length ligands. Electrochemical studies of the complexes show irreversible one electron reduction process around -2.15 to -1.60 V The reduction potential of gadolinium(III) complexes shifts towards anodic directions respectively upon increasing the chain length. The catalytic activity of the gadolinium(III) complexes on the hydrolysis of 4-nitrophenylphosphate was determined. All gadolinium(III) complexes were screened for antibacterial activity.

• 한국응용과학기술학회지
• /
• 제35권2호
• /
• pp.454-462
• /
• 2018

본 연구는 간호보건계열 대학생의 전공만족도, 진로성숙도가 취업스트레스에 미치는 영향을 알아보기 위한 서술적 조사연구이다. 본 연구는 G시의 3개학과 간호보건계열 대학생 410명을 대상으로 2017년 9월 26일부터 10월 31일까지 설문조사하였다. 수집된 자료를 토대로 기술통계, ANOVA, ANCOVA, Pearson correlation coefficients, Multiple regression으로 분석하였다. 연구결과, 전공선택 동기에 따라 전공만족도(F=9.856, p<.001) 및 진로성숙도(F=6.005, p=.001)가 유의한 차이가 있었으며, 학점은 진로성숙도(F=2.755, p=.042) 및 취업스트레스(F=3.503, p=.016)와 유의한 차이가 있었다. 또한 토익점수는 전공만족도(F=4.514, p=.004)와 유의한 차이가 있었다. 취업스트레스는 전공만족도(r=-.314, p<.001)와 진로성숙도(r=-.514, p<.001) 간에 유의한 상관관계가 있었으며 취업스트레스에 영향을 미치는 요인으로는 전공만족도(${\beta}=-.125$, p=.007), 진로성숙도(${\beta}=-.459$, p<.001) 순으로 나타났다. 이를 토대로 간호보건계열 대학생의 취업스트레스를 줄이기 위해 저학년 때부터 학과별 특성에 맞는 전공지도 프로그램을 마련하고 그에 따른 진로지도가 필요하리라 사료된다.