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이재환,박상원 한국섬유공학회 1996 한국섬유공학회지 Vol.33 No.9
For the development of economic, automated, and computer-aided manufacturing process of textile printing screen, photocuring of PVA emulsion by argon LASER was studied. The crosslinking-degree of PVA, photosensitized by diazonium salt, was analyzed by gravimetric and IR-spectroscopic method. The exposure time was longer than 4 $\mu$s with 1 W power and 50 $\mu$m spot size for processable crosslinking. The crosslinking behavior of PVA showed typical S-shape kinetics against the cumulative exposure time.
이재환,남상용 인간식물환경학회 2023 인간식물환경학회지 Vol.26 No.3
Background and objective: Mesembryanthemum cordifolium is a plant belonging to the Aizoaceae family and is native to South Africa and Namibia. As a CAM plant, M. cordifolium exhibits strong resistance to drought stress and can be utilized for the removal of soil salinity and heavy metals. Furthermore, it is an important medicinal crop with anti-inflammatory and antidepressant effects. However, despite its potential benefits, research on the optimal growth environment for M. cordifolium remains scarce. Methods: Therefore, this study selected M. cordifolium f. variegata with high ornamental value as the experimental plant and compared the effects of different shading levels on the growth and leaf color quality of variegated baby sun rose (M. cordifolium f. variegata). Six shading levels (0, 35, 45, 60, 75, and 99%, respectively) were designed using polyethylene (PE) shading films. Results: The results showed that the shoot height, shoot width, dry weight, and chlorophyll content (SPAD units) were highest under the 60% shading level, while leaf length, leaf width, and fresh weight were highest under the 75% shading level. On the other hand, growth was relatively lower under the 0% shading level, which suggests that M. cordifolium f. variegata prefers shade over direct sunlight. On the contrary, M. cordifolium f. variegata showed growth even under the 99% shading level, proving to have strong shade tolerance, but the leaf color quality was lowerst. Conclusion: In conclusion, to significantly increase the size and biomass of plants and improve leaf color quality when cultivating M. cordifolium f. variegata under shading treatment, it is recommended to cultivate it under 60-75% shading levels.
이재환,신민식,김병춘 한국부동산경영학회 2013 부동산경영 Vol.8 No.-
본 연구는 도시의 양적인 성장의 한계 속에서 특히 대구와 같이 도심의 중심부의 쇠퇴와 관련된 문제들을 해결하기 위한 하나의 방향으로, 도시의 역사적인 부분을 활용하여 도시의 질적인 성장을 통하여 도시재생이라는 문제에 접근하고자 한다. 도시의 역사적인 부분에 대한 고려는 일제 강점기와 근대를 거치면서 약해진 한국도시의 정체성 회복이라는 부분에 대하여 근본적인 방향을 제시할 수 있으며 또한 그러한 과정을 통하여 현재 지방도시 특색화에도 같은 맥락으로 관련을 지을 수 있을 것이다. 특히 대구의 중심부인 중구일원은 고대부터 조선시대까지 도시의 근간을 이루어왔으며 조선시대부터는 읍성을 중심으로 읍성 안쪽과 그 주변을 중심으로 도시적인 발달과 정체를 반복해 가면서 도시를 형성 해 왔으며 지금까지도 상업과 문화의 중심적인 역할을 담당하는 지역으로 존재하였다. 하지만 지금까지 이러한 도심의 역사적인 면이 도시계획이나 도시 특색 화를 위한 문화적인 요소형성에 있어 충분히 고려되지 않았으며 그 결과 여러 다른 도시와 별 다른 차별성을 가지지 못한 채 도시규모에 걸맞은 질적인 요소가 부족한 상태로 이어져 온 것이 사실이다. 그러므로 이러한 도시의 역사문화적인 요소를 활용하여 도시 계획에 반영한다면 도시의 질적인 부분을 한 차원 더 향상시키면서 시민들이 지역에 대한 자긍심의 고취와 함께 도심부의 재생에 중요한 요소가 될 수 있을 것이다.
Role of echocardiography in clinical hypertension
이재환,박재형 대한고혈압학회 2015 Clinical Hypertension Vol.21 No.8
Hypertension is amajorand correctable cardiovascular risk factor. The correct diagnosisofhypertension andprecise assessment of cardiovascular risk are essential to give proper treatment inpatientswithhypertension. Althoughechocardiography is the second-line study in the evaluationofhypertensivepatients, it givesmany clues suggestingbadprognosis associated with hypertension, including increased left ventricular (LV) mass, decreasedLV systolic function, impaired LV diastolic function, and increased left atrial size anddecreased function. Alongwith conventional echocardiographic methods, tissueDoppler imaging, three-dimensional echocardiography, and strain echocardiography arenewer echocardiographic modalities inthe evaluation of hypertensive patients in the current echocardiographic laboratories.Understandingconventional andnewer echocardiographicparameters is important inthediagnosis andassessmentof cardiovascular risk inhypertensivepatients.
지도자에 대한 수련자 욕구충족성과 이상적 자아 일치성이 수련자 애착과 지각된 서비스 품질에 미치는 영향
이재환,정재환,윤오남 한국스포츠학회 2015 한국스포츠학회지 Vol.13 No.2
This study is approached to the relationship between coaches and trainees from the perspective of attachment theory. We use the trainees' need satiation and ideal self-congruence with coaches' personality as major causal factors that influence trainees' attachment to a coach. Specifically, this article uses autonomy need, relatedness need, and competence need as the dimensions of need satiation. The purpose of this study is to investigate the influence of these factors on the trainees' attachment to a coach and trainees' perception of the educational service quality provided by a coach. The empirical results suggest that trainees' relatedness need satiation hae strongest impact on the trainees' attachment, and ideal self-congruence has the positive relationship with the trainees' attachment. Also, the hypothesis that trainees' attachment to a coach will have positive influence on trainees' perception of the educational service quality provided by a coach is supported. The empirical results show that the effective way of building the strong coach-trainee and consumersports center relationship to a sports center.