MIMO 시스템에서 송수신 결합 최적화에 관한 연구

유미연,이원문,홍인기 경희-다반 ASIC 설계교육센터 2002 경희-다반 ASIC센터 논문집 Vol.3 No.-

본 논문에서는 4G 이동통신 시스템 기반 기술인 MIMO (Multi-Input Multi-Output) 시스템에서, 채널 정보를 이용할 때, 결합 송수신 최적화 형태를 유도 하였다. Lagrange Multiplier Method를 이용하여 일반적인 SINR(Signal to interference and noise ratio)의 극대값을 유도하는 과정에서, 결합 송수신 형태를 수식적으로 유도하였고, 이를 ITU-R M.1225 채널 모델에 적용하여 시뮬레이션 하였다 또한 채널에 대한 정보가 없을때, 시공간 다이버시티를 얻을 수 있는 STBC(Space time Block Coding)의 MIMO 시스템과 비교하였다.

펜톤 시약 투입 변화에 따른 염색폐수의 처리효율 향상에 관한 연구

이상호,문혜진,김유미 대한상하수도학회 2003 상하수도학회지 Vol.17 No.1

This research was carried out to enhance the removal efficiencies of COD_Cr and color from dyeing wastewater by Fenton process, involving oxidation and coagulation. The experimental variables for this study include dosage division ratio of hydrogen peroxide and amount of Fenton's reagent. In the case of H_2O_2 divided dosage, 7:3 was more effective than 3:7 to remove COD_Cr and color. The results show than COD was mainly removed by Fenton coagulation, where the ferric ions are formed in the initial Fenton reaction. In contrast, color was removed by Fenton oxidation rather than Fenton coagulation. It was found out that overdose of Fenton's reagent has been applied in the "B" Treatment Plant. In spite of 20% reduction of the hydrogen peroxide dosage, effluents are satisfied with Discharged Water Quality Standards.

폐렴 구균(Streptococcus pneumoniae)에 의한 척수 경막외 농양 1예

이지영,위유미,손경목,기현균,문치숙,오원섭,백경란,송재훈 대한감염학회 2004 감염과 화학요법 Vol.36 No.6

폐렴구균은 보통 폐렴이나 뇌막염을 일으키는 균으로 척수 경막외 농양을 일으키는 경우는 매우 드물다. 본 저자들은 폐렴 구균에 의한 척수 경막 외 농양을 경험하여 보고하는 바이다. 과거 건강했던 36세 남자 환자로 사다리에서 낙상한 후 요통 및 고열, 신경학적 이상으로 내원하여 자기 공명 촬영 결과 척수 경막 외 농양으로 진단받고 항균제 투여와 함께 응급 수술을 시행하였다. 농 배양 결과 페니실린 감수성인 폐렴 구균이 분리 되었고, 수술 요법과 항생제 투여 후 농양은 치유되었으나 신경학적 이상은 호전 없는 상태로 타원으로 전원되었다. Pneumonia and meningitis are the most frequent manifestations of pneumococcal infections. Pneumococcal spinal epidural abscesses have been rarely reported. Spinal epidural abscess by Streptococcus pneumoniae has been diagnosed among the patients with diabetes mellitus, alcoholism, corticosteroid therapy, intravenous drug use, chronic renal failure, AIDS, and history of spinal surgery. Recently, we experienced a case of pneumococcal spinal epidural abscess after spinal trauma. A 36-year-old male patient was admitted with back pain, fever, and paraplegia which occurred 5 days after the trauma. Spine MRI revealed spinal epidural abscess at the level from T2 to T9. He was treated with antimicrobial agents and surgical exploration for spinal epidural abscess. Pus culture grew S. pneumoniae which was susceptible to penicillin. Despite early surgical treatment, neurologic sequelae remained. Considering the high mortality and morbidity of pneumococcal spinal epidural abscess, early diagnosis and aggressive treatment including surgical intervention and antibiotics therapy should be implemented immediately.

근관 내 불규칙 확장부에서 sealer 적용방법에 따른 충전 효과 평가

김성용,이미정,문장원,이세준,유미경 大韓齒科保存學會 2005 Restorative Dentistry & Endodontics Vol.30 No.1

본 실험은 resin 시편을 이용하여 미리 제작한 근관 내 불규칙 확장부에서 근관 충전용 sealer의 적용 방법에 따른 충전 효과를 평가해 보았다. Endo-training Bloc을 절단하여 사십 개의 규격화된 resin 블록 시편을 획득하였다. 각각의 시편에 $, 08taper GT 파일을 사용하여 근관을 형성하였고 근관에 손상이 가지 않도록 시편을 양분한 후 양분된 시편의 한 쪽 근관 벽에 다양한 근관 내 확장부를 표현하는 구를 형성하였다. 양분된 시편을 결찰하고 절단 부위를 밀봉하였으며 AH26 sealer를 사용하여 단일 cone 충전법으로 근관을 충전하였다. 네 가지의 근관 충전용 sealer의 적용방법을 이용하였다: A군,$ K-file : B군, ultrasonic file : C군, lentulo spiral: D군. EZ-Fill bi-directioanl spiral. 모든 시편은 37˚상대습도에서 1주일간 보관한 후 각 시편을 근단에서 3mm, 4mm, 5mm 부위에서 수평으로 절단하고 각각의 절단면을 위상차현미경과 디지털 카메라를 이용하여 30배율로 관찰하고 촬영하였다. 관찰된 절단면은 scoring system을 이용하여 점수를 산정하였고 각 군 간의 통계적인 유의성 유무는 Fisher's Exact Test를 이용하여 시행하였다. The aim of this study was to evaluate the effectiveness of sealer placement in simulated root canal extensions. Forty resin blocks were attained from the Endo-training Bloc. In each block. The simulated root canal was made with $, 80taper GT file. After each block was longitudinally split into two halves, a standardized groove was prepared on one canal wall of two halves to simulate the canal extensions with various irregularities. The two halves of each block were assembled and all simulated root canals were obturated by single cone method with AH26 sealer. Four different methods of sealer placement were used: group A, $ K-file; group B, ultrasonic file; group C, lentulo spiral; group D, EZ-Fill bi-directional spiral. All obturated blocks were stored in 100% humidity at 37℃ for 1 week, Using a low speed saw, each block was sectioned horizontally. Images of the sections were taken using a stereomicroscope at 30 magnification and a digital camera. The amount of the sealer in the groove was evaluated using a scoring system, a higher score indicated better sealing effectiveness. The data was statistically analysed by Fisher's Exact Test. The sealing score was the lowest, specially at the middle area of canal extensions in group A, and that was statistically significant difference from other groups. In conclusion, the ultrasonic file, lentulo spiral and EZ-Fill bi-directional spiral were effective methods of sealer placement in simulated canal extensions. The K file was the least effective method, specially at the middle area of canal extensions.

Acylthiocholine의 합성

정두희,이지현,박유미,정대일,곽문정,신영주 東亞大學校附設基礎科學硏究所 1998 基礎科學硏究論文集 Vol.15 No.2

Choline esters that are used with substrate of EE-AChE-catalyzed hydrolyses were synthesized by two methods. 2-Chloroethyl thiohexanoate 4a, 2-chloroethyl thioheptanoate 4c, and 2-chloroethyl thiooctanoate 4b were synthesized by treatment of hexanoyl chloride 3a, heptanoyl chloride 3c, and octanoyl chloride 3b with ethylene sulfide 2. Hexanoylthiocholine 6a and octanoylthiocholine 6b were synthesized by using 4a and 4b with trimethylamine 5. Secondly after reaction ethylene sulfide 2 with dimethyl amine 7 and acylation by acid anhydride 8, heptanoylthiocholine 6c, decanoylthiocholine 6d were synthesized by treatment of methyl iodide.

신규간호사와 프리셉터가 인지하는 프리셉터의 교수효율성 비교

김지양,김영선,김춘실,박현숙,신미영,윤연숙,조유숙,박미미,유문숙 한국간호과학회 간호행정학회 2009 간호행정학회지 Vol.15 No.2

Objective: The purpose of this study was to compare preceptors and new graduate nurses on their perception of preceptor teaching effectiveness. Methods: The participants were 90 new nurses and 90 preceptors who worked in A medical center. The data were collected from July 1 to September 30, 2008. A cross-sectional descriptive survey was done using a structured questionnaire. Results: New nurses' perception (4.07±.44) of the preceptor teaching effectiveness was significantly higher than perception of the preceptors (3.57±.37). Fifty five percent of new graduate nurses reported a lack of coherence in the preceptor's practice guidelines. For 5 causal factors classified on the teaching effectiveness, the factor of 'Professional knowledge and ability' showed the highest score, but 'Interpersonal and communication skill' got lowest score for both group. Preceptors responded that they did not have enough time to teach well because of their heavy workloads. Conclusions: These results suggest that the preceptors need appropriate compensation and education opportunities, and new graduate nurses need consistent education by the teaching professionals. Therefore, it is important to give preceptors full charge of the preceptorship. Also, it will be necessary to develop education programs to enhance interpersonal and communication skill for preceptors and new nurses.

Changes in Aurantio-Obtusin and Glucoaurantio-Obtusin Content in Cassiae Semen via Treatment with a Crude Enzyme Extract from Aspergillus usamii

( Jong Moon Hur ),( Soon Ho Kwon ),( Jae Hyun So ),( Mi Ra Jun ),( Young Hwa Kang ),( Yu Mi Lee ),( Kyung Bok Lee ),( In Koo Rhee ),( Moon Soon Lee ),( Kyung Sik Song ) 한국미생물생명공학회 2007 Journal of microbiology and biotechnology Vol.17 No.11

독거 취약층 통풍 환자들의 요산강하 요법 치료지속성 연구

장유미 ( Yu Mi Jang ),김민정 ( Min Jung Kim ),유보림 ( Borim Ryu ),선지유 ( Ji Yu Sun ),문기원 ( Ki Won Moon ),신기철 ( Kichul Shin ) 대한내과학회 2023 대한내과학회지 Vol.98 No.3

Background/Aims: Irrespective of socioeconomic status, urate lowering therapy (ULT) is crucial for all chronic gout patients. We investigated the presence of missed opportunities for ULT among underprivileged patients treated at a major public hospital in Korea after a severe gout flare. Methods: We first collected information on patients admitted under the diagnosis of gout (International Classification of Diseases 10th Revision code M10) at a major public hospital from March 2011 to February 2022. De-identified patient data, including sociodemographic status, uric acid levels, list of medications, and outpatient follow-up data, were extracted. The patients were grouped into frail patients, who were living alone and were admitted to the specialized ward (SPE), and those who were admitted to the general ward (GEN). Primary endpoints were the outpatient visit rate immediately after discharge and the rate of ULT maintenance after a year. Results: Acute gouty arthritis was the chief event during admission in 136 cases. The mean (± standard deviation) age was 60.1 (± 16.1) years, and 95% of the patients were male. Only 18% of the patients were on ULT before admission. The patients were divided into the SPE (n = 25) and GEN (n = 111) groups. Body mass index in the SPE group was lower than in the GEN group (23.4 [± 4.4] and 25.1 [± 3.7], respectively, p = 0.082). The uric acid levels at admissio in the SPE and GEN groups were 9.6 (± 2.7) and 7.6 (± 2.3), respectively (p = 0.0023). After discharge, 80% and 95.5% of the SPE and GEN group participants presented to the outpatient department within 1 month, respectively (p = 0.019). ULT was continued or initiated in 85% of the patients. However, fewer patients continued colchicine for at least 3 months in the SPE group compared to the GEN group (25.0% and 43.4%, respectively). After 1 year, the SPE group had a higher rate of loss to follow-up (32.0% vs. 23.4%), higher uric acid levels (7.4 [± 3.8] vs. 6.2 [± 2.1]), and fewer ULT users (41.2% vs. 50.6%) compared to the GEN group, but the differences were not statistically significant. Conclusions: Frail patients who lived alone, even in the metropolitan area, missed opportunities for ULT and long-term gout care. Joint efforts on the part of health authorities and social workers are necessary to devise a strategy for better access and management among underprivileged gout patients. (Korean J Med 2023;98:137-143)

요양병원 요양보호사의 감정노동이 소진에 미치는 영향

문유미(Moon, Yu Mi),신소영(Shin, So Young) 노인간호학회 2018 노인간호학회지 Vol.20 No.2

Purpose: The purpose of this study was to investigate the relationship between emotional labor and burnout in long-term care hospital care workers. Methods: Participants were 126 care workers from 5 different long-term care hospitals in B city, Korea. Data were collected from May to July 2017. A set of self-report questionnaires was administered to assess general characteristics, emotional labor, and burnout in the participants. Collected data were analyzed using descriptive statistics, t-test, ANOVA, Pearson correlation coefficients, and stepwise multiple regression with the IBM SPSS/WIN 23.0 program. Results: The M±SD score for burnout was 2.45±0.41(out of 5) and for emotional labor, 2.67±0.52 (out of 5). The final regression model was statistically significant and accounted for 34% of the variance in burnout. The factors that significantly affected burnout included dissonance (a ubscale of emotional labor; β=.38, p<.001), health status (β=-.35, p<.001), and motivation to work (family living; β=.31, p=.002). Conclusion: In order to reduce burnout in care workers, managers and members of long-term care facilities need to acknowledge emotional labor as an important mental health issue and put forth efforts to create constructive working environments.

독거 취약층 통풍 환자들의 요산강하 요법 치료지속성 연구

장유미 ( Yu Mi Jang ),김민정 ( Min Jung Kim ),유보림 ( Borim Ryu ),선지유 ( Ji Yu Sun ),문기원 ( Ki Won Moon ),신기철 ( Kichul Shin ) 대한내과학회 2024 대한내과학회지 Vol.99 No.2