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정선화,조남석,최태호 한국목재공학회 2004 목재공학 Vol.32 No.1
생장속도가 빨라서 단위면적당 Biomass의 생산량이 많은 어저귀(Indian mallow, Abutilon avicennae G.)를 원료로 하여 펄프화하였으며, 제조한 한지의 물리적·기계적·현미경적 특성에 관하여 비교 검토하였다. 제조한 한지의 특성을 살펴보면 광학적, 강도적 현미경적인 특성에서 설포메틸 펄프화법이 우수한 결과를 나타냈고, 장섬유인 인피부 펄프에 대한 단섬유인 목질부 펄프의 혼입량 증가에 따른 변화에 있어 지질(밀도, 백색도, 불투명도, 지합)의 변화는 점차 증가했으나, 강도는 감소하는 경향을 나타냈다. This study was carried out to investigate the sheet properties of Indian mallow Hanji, made by different pulping methods, such as alkali and sulfomethylated pulpings, and different stock compositions, various mixing ratios of bast fiber and woody core fibers. Indian mallow hanjis made from the sulfomethylated pulps had higher brightness and sheet strength than the alkali pulps. It was found that the brightness of sulfomethylated pulp was enough high without an extra-bleaching. In the mechanical properties of Indian mallow hanjis mixed with bast fiber and woody core stalk pulps, the sheet strength were decreased as wood core pulps contents were increased. The sheet formation were increased as the increase of woody core pulps contents, while the sheet strength decreased Although the sulfomethylated pulping resulted in higher pulp yield, no morphological differences of fiber surfaces were shown as compared to the different pulping methods.
조현병 환자에서 항정신약물이 대사지표에 미치는 영향 조사 - 1년 추적연구
정선화,임선진,윤해주,박은경,이종일 대한조현병학회 2015 대한조현병학회지 Vol.18 No.2
Objectives : Schizophrenia patients are known to be more prone to metabolic disease than normal people. This study aimed to identifythe changes in metabolic parameters of schizophrenia patients using atypical antipsychotic drugs for 1 year. Methods : A total of 200 schizophrenia patients were recruited and categorized into the aripiprazole-treatment group and controlgroup taking 5 atypical antipsychotic drugs. Comparative analysis were between groups. The prescriptions of psychotropic drugswere collected by a review of medical records. Blood was collected after fasting for 12 hours at the starting point of treatment andthe 12th month, and patient medical records were evaluated for basici nformation and treatment history. Physical measurement,the prevalence of metabolic syndrome and metabolic parameters were studied using ATP-III diagnostic criteria. Results : From the study, the aripiprazole-treatment group had a mean weight increase of 0.6 kg and the control group had amean weight increase of 6.5 kg at the 1 year follow-up, showing a significant difference between the two groups. There were alsosignificant differences between the two groups in waist size, systolic and diastolic blood pressure, fasting blood sugar, total cholesterol,triglyceride, HDL-choleseterol and prolactin level. Along with meaningful improvement of the symptoms, aripiprazoletreatmentgroup showed less effect on in abdominal obesity, diabetes, blood pressure, cholesterol and prolactin than other atypicalantipsychotic drugs. Conclusion : Therapeutic intervention such as diagnosis, treatment, weight management and diet improvement is necessary forschizophrenia patients. Psychiatric symptoms as well as internal meicine-related problems such as metabolic disease need to beaddressed in case management.
정선화,황희용 강원대학교 정보통신연구소 2012 정보통신논문지 Vol.16 No.-
본 논문에서는 YagiᅳUda안테나를 소형화시키기 위해 비유전율이 4.4, Loss tangent(tanS)이 0.025, 금속의 두께는 0.762mm를 갖는 FR4기판에 인쇄하는 방식을 택하였으며 한 개의 도파기와 다이폴 공진기,접지면을 사용한 반사기로 지향성을 가지는 Yagi-Uda 안테 나를 제안하였다. 안테나의 공진 주파수는 접지면의 길이와 공진소자와 접지면 간의 간격을 조절하여 ISM대역 내로 설계하였다. 안테 나의 특성해석에는 상용 시뮬레이션 툴인 Ansoft사의 HFSS™을 사용하였으며,제작 및 측정을 통해 안테나의 성능을 확인하였다. 제 작된 안테나는 2.44GHz-2.49GHz 대역에서 10dB이하의 반사계수를 가지며 최대이득 4.316dBi를 가진다. 이는 면적의 제약을 받으나 지향성을 요구하는 공간이나 장소에 설치되어 사용될 수 있을 것이다. In order to miniaturize a Yagi-Uda antenna with one director we use a planar printing method on a PCB substrate which has 4.4 relative dielectric constant, 0.025 loss tangent(tanS) and 0.762 mm thickness. The structure is composed of a open \/2 line for director, two open 入/4 lines for driver and a ground-plane for re幻ector. The resonant frequency of the proposed antenna is optimized by changing the lengths of the ground-plane and the gap between resonant element and ground-plane in 2.4GHz ISM band. The tool for the optimizing is a commercial electromagnetic software HFSS1 x, by Ansoft. The performance is verified through fabrication and measurement. The fabricated antenna has a reflection coefficient less than -10dB and a gain of 4.316dBi at 2.44GHz-2.49GHz. This is expected to be installed and used in a small region with the restric仕on of area and directivity.
정선화,김남재 덕성여자대학 학생생활지도연구소 2008 學生生活硏究 Vol.24 No.-
Examined the characteristics of the students who entered Duksung Women's University in 2008. The total number of 1054(out of 1445) undergraduates completed an autobiographical questionnaire which inquires about demographic variables, family environment, satisfaction with the university, expectancies of a campus life, value system, self-concept, and lecture subject. Results show that a majority of the students were graduated from high schools located in Seoul. Both of their parents are alive, in the middle or higher socioeconomic groups and of high educational accomplishment(at the lowest, high school graduates). One of the replicated findings is that students are highly interested in career development. A great proportion of career preparation. The result also indicate that many students have chosen our university solely based on their grades. And many students report that they are satisfied with their choice, which is very encouraging. Other result such as the characteristics unique to each college are also summarized and several suggestions are presented in the discussion section.
정선화,최병철,Jeong, S.H.,Choi, B.C. 한국전자통신연구원 2019 전자통신동향분석 Vol.34 No.2
The interest in facial recognition technology has been growing with the advancement of AI technology. With a confirmed accuracy of over 99%, the areas of application of the technology have expanded, including smartphone unlocking, online payment authorization, building access management, and criminal apprehension. This indicates that the technology has effectively transitioned from laboratory to field applications. This study performs patent analysis to determine recent innovations and diffusion trends in facial recognition technology. Specifically, R&D activities involving facial recognition technology are investigated at both the country level and company level. Significant patents are also considered. This study contributes to R&D management teams by proposing useful plans and strategies.