관동맥질환에서 저밀도 지단백 입자 크기의 분포

임효영,김인숙,승기배,강동헌,전두수,장기육,박준철,이수영,홍순조,최규보 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.8

상수도 강관용 세라믹 코팅의 특성 분석

李豊憲,李揆鎭 홍익대학교 산업기술연구소 2002 産業技術 Vol.12 No.-

A ceramic coating of glass was deposited on a water supply steel pipe sample and its microstructure and chemical resistance were evaluated. Glass enamel coating was found to be relatively uniform over the substrate surface. However, a number of pin holes were observed due to the evolution of gases formed from the steel substrate. Iron oxide was present along with glass in the coating, as a result of oxidation of the substrate exposed by pin holes. The chemical resistance tests showed that the coating has less chemical resistance than industrial coating reported in the literature. This resulted from the chemical composition of the enamel glaze used in this study.

생약추출물 섭취와 운동이 비만 Zucker 쥐의 혈청 IGF-1/IGFBP-3 수준에 미치는 영향

이헌규,조인호,양대승 한국스포츠리서치 2005 한국 스포츠 리서치 Vol.16 No.2

The purpose of this study was the investigation of the effect of embro and regular exercise on blood glucose. insulin and IGF-1 and IGFBP-3(Insulin Like Growth Factor Binding Protein) level against obese zucker ratfa/fa. In general. IGF-Ⅰ play important role in the regulation somatic growth. metabolism. cellular proliferation/differentiation. With insulin, IGF-Ⅰ is another regulation factor for blood glucose concentration. For this study, obese zucker rats(n=21) were divided into three group: the control(no exercise, CON, n=7), embro group(no exercise but supplement embro, emb개, n=7). and embro+exercise(n=7). Animals in exercise group were run on treadmill for 12week (5day/week^(-1), 1h^(-1)/day^(-1), 20m/min^(-1) speed). After 12 week, All animals (CON and EX) were anesthetized by sodium pentobarbital and blood was extracted and frozen for further analysis. Plasma glucose and insulin concentration were significantly decreased in embro and embro+ exercise than CON(P<.05). and Blood IGF and IGFBP-3 level were significantly increased in embro and embro+ exercise group(P<.05). Thus. These results suggest that embro and regular exercise may has protective effect in insulin resistance by controlling blood glucose and increasing IGF-1/ IGFBP-3 in obese zucker rat.

경량골재 형성에 미치는 폐 FRP의 열분해 특성

李豊憲,李揆鎭 홍익대학교 산업기술연구소 2003 産業技術 Vol.13 No.-

In order to utilize waste FRP as lightweight aggregates, waste FRP was thermally decomposed in N2 and air atmospheres. Thermal analysis and ball milling of the decomposed FRP were carried out and the results were evaluated with respect to forming and foam structure of the aggregate. The decomposed FRP containing char and glass fiber was found to be milled with ease and formed into aggregate. Decomposition of FRP in N2 atmosphere resulted in a large amount of char, which remained during firing due to glassy phase formed. However, decomposition in air reduced the amount of char and resulted in foam structure with isolated pores and low density. The results of thermal analysis indicate that porous lightweight aggregates can be fabricated by controlling the amount of char and adding a foam agent.

흉부 유연성 운동이 척추측만증 환자의 폐활량과 흉곽 확장에 미치는 영향

심재훈,오덕원,이규완 한국전문물리치료학회 2002 한국전문물리치료학회지 Vol.9 No.2

The objectives of this study were to investigate the effects of thoracic flexibility exercise on chest function and mobility and to provide the information of physical therapy for patients with idiopathic scoliosis. Forty female subjects who were diagnosed with scoliosis participated in this study and were divided into the experimental and control groups. The experimental group consisted of 20 patients who were treated with thoracic flexibility exercise program during the admission (10 days) and one month after discharge. The control group consisted of 20 patients who were not treated with thoracic flexibility exercise program. Vital capacity was measured using a respirometer. The chest expansion were calculated using differences of chest circumference between maximum inspiration and maximum expiration measured under armpits, at the junction between the sternum and xyphoid process, and at the waist. All subjects were measured two times: before the admission and at one month after discharge. Data were compared by groups using independent t-test. Vital capacity and chest expansion values (the armpit, chest and waist values) were significantly higher for the experimental group compared to those of the control group (p<.05). The findings of this study show that thoracic flexibility exercise program can lead to an increase in vital capacity and chest expansion and has a positive effects in relieving symptoms and restoring thoracic mobility.

TMS320F240을 이용한 PWM 인버터 유도전동기 구동 시스템의 전도노이즈 저감을 위한 스위칭 기법

朴奎炫,金利勳,元忠淵,金奎植,崔世琓,咸年根 성균관대학교 2003 학술회의지원논문목록집 Vol.2003 No.-

PWM 인버터에 의해 구동되는 유도전동기에 발생되는 고주파 커먼 모드 전압은 전도성 EMI, 전동기 접지전류, 베어링 전류 및 다른 원치 않는 결과의 주원인이 된다. 인버터 제어의 무효벡터 스위칭 상태는 나머지 유효벡터 스위칭 상태에 비교하여 큰 커먼 모드 전압을 일으킨다. 그러므로 이 논문은 커먼 모드 전압을 완화하는 스위칭기법을 다룬다. 즉 정현파 PWM기법을 기본으로 한 커먼 모드 전압 제거방법을 제안하였다. PWM 신호는 각각의 정현파 기준신호와 120˚위상차가 나는 3개의 캐리어 파형과 비교하여 발생된다. 시뮬레이션과 실험적결과는 제안된 PWM 기법에서 커먼 모드 전압이 종래의 PWM 기법보다 약 66% 더 저감됨을 보였다. High frequency common mode voltage produced by PWM inverter fed induction motor is a major cause of conducted EMI. creation motor ground currents, bearing currents and other hamful products. The zero switching states of inverter control invoke large in comparison with the non-zero switching state of inverter control. We proposed a common mode voltage reduction method based on sinusoidal PWM technique. PWM signal are generated by comparing respective sinusoidal reference signal with three triangular carrier wave displaced of 120˚. Simulation and experimental result show that common mode voltages in the propsed PWM technique are reduced by approximate 66% more than conventional PWM technique.

방사선 처리에 의한 폴리비닐 알콜의 생분해도 개선

정진호,박남용,조훈제,이선미,김정규 한국물환경학회 2004 한국물환경학회지 Vol.20 No.3

Radiation treatment with gamma-rays and electron-beams was used to remove polyvinyl alcohol(PVA), one of the main components of dyeing wastewater. PVA was effectively decomposed by radiation treatment, thus the removal was near 100% at an initial PVA concentration of 44 ㎎/L. However, total organic carbon(TOC) removal was less than 5% due to lower transformation of PVA to CO₂. This directly indicates the radiation treatment alone is not appropriate for the complete decomposition of PVA. In this sense, the improvement of biodegradability(BOD_5/COD) of PVA by radiation treatment was studied. Both gamma-ray and electron-beam treatments significantly increased the biodegradability of PVA by transforming non-biodegradable PVA to biodegradable by-products. This suggests radiation treatment, especially electron-beam treatment that showed better improvement of biodegradability, can be used as a pre-treatment of biological degradation process of PVA.

Seasonality and Association With Climate Factors of Epiglottitis in South Korea: A Nationwide Population-Based Study

Lee Jong Hwan,Kim Su Il,Lee Hun Hee,Eun Young-Gyu,Lee Young Chan 대한후두음성언어의학회 2023 대한후두음성언어의학회지 Vol.34 No.3

Background and Objectives The seasonality and climatic relevance of epiglottitis have not yet been fully investigated in a population-based cohort. This study aimed to examine the seasonality of epiglottitis and explore associated climatic factors.Materials and Method In a retrospective cohort study using the Korean National Health Insurance claims database from January 2010 to December 2019, we identified patients with epiglottitis who claimed the following diagnostic codes as a principal or first additional diagnosis: International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) codes J0510, J0510.001 (acute epiglottitis without obstruction, epiglottitis not otherwise specified), and J0511 (acute epiglottitis with obstruction). We calculated the seasonal ratio as the ratio of the highest to the lowest number of patients per month to compare the degree of seasonality. In addition, the climate data points corresponding to each month were obtained. Thus, we analyzed the correlations between the monthly patient numbers for each disease and various climatic factors.Results There were seasonal variations in the number of patients with epiglottitis, which were highest from winter to spring and lowest in summer. The prevalence of epiglottitis was strongly correlated with the average temperature, ground temperature, relative humidity, precipitation, daily temperature range, and sunlight rate. Additionally, epiglottitis was most prevalent in the <9 age group before 2013, but after 2013, it was most prevalent in the 30–39 age group.Conclusion This large population-based study demonstrated clear seasonality and climatic association in patients with epiglottitis. Further studies exploring the detailed demographic factors affecting epiglottitis are required to address similar diseases more effectively.

Utilization of End-of-Life Care Rooms by Patients Who Died in a Single Hospice Unit at a National University Hospital in South Korea

Gyu Lee Kim,Seung Hun Lee,Yun Jin Kim,Jeong Gyu Lee,Yu Hyeon Yi,Young Jin Tak,Young Jin Ra,Sang Yeoup Lee,Young Hye Cho,Eun Ju Park,Young In Lee,Jung In Choi,Sae Rom Lee,Ryuk Jun Kwon,Soo Min Son Korean Society for Hospice and Palliative Care 2023 한국호스피스.완화의료학회지 Vol.26 No.2

Purpose: For the dignity of patients nearing the end of their lives, it is essential to provide end-of-life (EoL) care in a separate, dedicated space. This study investigated the utilization of specialized rooms for dying patients within a hospice unit. Methods: This retrospective study examined patients who died in a single hospice unit between January 1, 2017, and December 31, 2021. Utilizing medical records, we analyzed the circumstances surrounding death, the employment of specialized rooms for terminally ill patients, and the characteristics of those who received EoL care in a shared room. Results: During the 1,825-day survey period, deaths occurred on 632 days, and 799 patients died. Of these patients, 496 (62.1%) received EoL care in a dedicated room. The average duration of using this dedicated space was 1.08 days. Meanwhile, 188 patients (23.5%) died in a shared room. Logistic regression analysis revealed that a longer stay in the hospice unit was associated with a lower risk of receiving EoL care in a shared room (odds ratio [OR]=0.98, 95% confidence interval [CI] 0.97~0.99; P=0.002). Furthermore, a higher number of deaths on the day a patient died was associated with a greater risk of receiving EoL care in a shared room (OR=1.66, 95% CI 1.33~2.08; P<0.001). Conclusion: To ensure that more patients receive EoL care for an adequate duration in a private setting, additional research is necessary to increase the number of dedicated rooms and incorporate them into the hospice unit at an early stage.

Surveillance of Acute Gastroenteritis in Seoul, Korea, During May 2004 and June 2007

Lee, Jae-In,Park, Sang-Hun,Kim, Moo-Sang,Oh, Young-Hee,Yu, In-Sil,Choi, Byung-Hyun,Lee, Gyu-Cheol,Kim, Mi-Suk,Jang, So-Young,Lee, Chan-Hee 대한미생물학회 2009 Journal of Bacteriology and Virology Vol.39 No.4

Acute gastroenteritis (AGE), which is one of the most common diseases worldwide, primarily occurs in infants and young children in both developed and developing countries. To investigate the prevalence of AGE in Korea, 6,788 stool specimens collected from hospitalized patients with AGE in Seoul, Korea from March 2004 to June 2007 were analyzed by enzyme immunoassay, reverse transcription-PCR, DNA sequencing and phylogenetic analysis. Enteric viruses and bacteria were detected in 2,955 (43.5%) and 1,389 (20.5%) specimens, respectively. Among the enteric viruses detected, rotavirus (19.7%) and norovirus (18.9%) were the predominant causative agents, followed by adenovirus (2.5%) and astrovirus (2.4%). Staphylococcus aureus was the most commonly observed bacteria (8.0~19.2%). The epidemic peaks of the enteric viruses were October to December for norovirus, January to May for rotavirus, and August to October for adenovirus. The seasonal activity of rotavirus was shifted from winter to late spring. However, astrovirus did not display seasonal activity in this study. Although viral AGE primarily occurred in patients younger than 5 years of age, the incidence of viral AGE in children aged 6 to 14 years was significant. The results of this study will contribute to the currently available epidemiological data and improve public health and hygiene via amelioration of diagnostic methods and longitudinal surveillance.