고위험군 가와사끼병에서 스테로이드 추가 요법의 효과

강선미,문은경,인수미,길홍량 대한소아과학회 2002 小兒科 Vol.45 No.12

PWM 인버터를 이용한 단상유도전동기의 보조권선제어

이성길,김영근,박수강 광주보건대학 2002 論文集 Vol.27 No.-

In this paper, an auxiliary winding driving system of single - phase induction motors is described. Starting time variations are obtained by controlling the auxiliary winding voltage magnitude and phase angle, while the motor's main winding is directly connected to the local utility. A variable auxiliary winding voltage phase angle is shown to yield significant torque control, providing starting and braking torque. The analysis includes the determination of the relationship between the auxiliary winding voltage phase angle and the phase angle difference between the main and auxiliary winding current. The paper proposed for adjusting an auxiliary winding voltage magnitude and phase angle. Experimental results of motor's starting characteristics with using the PWM inverter for auxiliary winding power supply are shown. The drive is tested using a dynamometer to experimentally verify the results of the theory.

LC 공진형 PWM 인버터를 이용한 X선 발생장치의 특성에 관한 연구

이성길,박수강,임홍우,조금배,백형래,임양수 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.1

The conventional types of X-ray generators were bulky in physical size and heavy in weight, and the control accuracies of the output voltages were not always satisfactory. The high frequency switching inverter and converter technology on power conversion and control systems have been greatly closed up introducing power semiconductor devices. In this paper, the newly developed converter to take the balance of the output voltage versus the ground are also presented in detail to decreasing the volume and the weight of high voltage transformer and to stabilize ripple. This converter consists of the two independent L-C series resonant circuits using the two capacitances and the two primary windings of high voltage transformer.

고주파 공진형 인버터식 X선발생장치의 관전압 불균형 개선

이성길,김영근,박수강 광주보건대학 2000 論文集 Vol.25 No.-

In order to radiate X-ray, the low ripple stabilized high voltage DC over the range of 40kV to 150kV is directly inflicted to X-ray tube. The energy characteristics of the radiated X-ray depend on the pulsating waveforms of the DC voltage supplied X -ray tube. In general, the low ripple voltage waveforms with fast rising times are required to increase with the dosage per unit time lest the exposure time should be longer in order that the motion artifacts of an object may be eliminated in actual. The rotating anode and the cathode of the metal-envelope X-ray tube are incorporated into an envelope made of metal, for instance stainless steel and copper, instead of hard glass. This metal envelope is able to collect the secondary electrons which causes harmful influence to thequality of the diagnostic images. Furthermore, the metal-envelope X-ray tube has mechanically higher strength than glass-envelope type, and so it suits for high power X-ray system. For those benefits, this type of X-ray tube is mainly used to obtain the high quality diagnostic images in X-ray angiography and X-ray computed tomography. The electrons collected at th envelope generate the eletric current flow form the ground to the cathode and occasionally the unmatched impedance of the anode side and the cathode side of the X-ray tube. The unmatched impedance causes the remarkable imblacne of the output voltage of the series resonant inverter-fed converter. In this paper, the newly-developed converter to take the balance of the output voltage versus the ground are also presented in detail. This converter consists of the two independent series resonant circuit using the two capacitance and the two parimary winding high-voltage transformer.

단상유도전동기의 부하적응형 위상제어시스템 설계

이성길,김승국,박수강 광주보건대학 2003 論文集 Vol.28 No.-

The three-phase induction motor is rugged, reliable, long-lived, self-starting, smooth-running. But it is relatively inexpensive and three-phase power in not available everywhere, so if possible we need single-phase motor with the same characteristics. In fact, single-phase induction motors have excellent characteristics and outnumber the three-phase variety. Most of the small electric motors used in home, farm, or office are single-phase induction motors of one type or another. This electric motors application field need most energy saving type drive according to enlargement of electronic goods and to tend high class. The paper is proposed a various phase control methods for energy saving of single- phase induction motor. The controllers that are embodied by each method can use by various usage according to each performance and it is considered that application may help in the electrical energy saving because is possible to other electrical appliances.

PFC를 적용한 AC/DC 승압형 컨버터 설계

백형래,박수강,최연옥,한엄용,이성길 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 No.1

Single-Phase diode rectifiers are widely used in industry. These rectifier, however, generate many harmonic components in the AC Power line and have the poor input power factor, which may create a power quality problem for other electrical apparatus in the vicinity of the rectifier. Power factor improvement and harmonic reduction in the AC line current have become very significant problems in single-phase diode rectifiers. In this paper, the high power factor boost converter using soft switching is proposed to improve the demerit. The simulation results show the validity of the proposed system.

Consumer Recognition Survey for Establishing the Reasonable Expiration Dates of Health Functional Foods

( Soo Jin Youn ),( Joo Youn Park ),( Hee Su Kim ),( Eun Jin Kang ),( Kil Jin Kang1 ),( Hye Kyung Park ),( Gun Hee Kim ) 한국식생활문화학회 2009 Food Quality and Culture Vol.3 No.2

This study investigated consumers` recognition on shelf life of health functional foods to set up their rational expiration date. For this study 107 male and female adults aged 20 to 59 years were randomly selected as major consumers of health functional foods. And their data were analyzed with SPSS 17.0. The questionnaire included questions asking a consumer`s recognition on the shelf life of health functional foods and how to treat health function food passing its shelf life. In this study, the consumers were found to pay attentions considerably to the shelf life. But most of them did not know an accurate meaning of the shelf life of health functional food and mistook it for expiry date. In addition, the consumers doubted safety of health functional foods passing the shelf life. Therefore, education for consumers about an accurate meaning of the shelf life was needed. The results of this study were considered to be helpful to set up a reasonable expiration date for health functional food.

위절제술 환자의 표준진료지침 개발 및 적용 효과

김은희,김철규,이순교,김순덕,이혜옥,권정순,이경미,이민미,심순미,유용만,신종식,강은희,이상일,김병식,오성태,육정환,박수길 한국의료QA학회 2003 한국의료질향상학회지 Vol.10 No.2

Background : Gastric cancer is the most common malignant tumor in Korea. surgical operation is one of the major treatment modalities for gastric cancer patients. Therefore, gastrectomy is one of the most common procedures in General Surgery. There were variation in length of hospital stay and medical treatment for gastrectomy between three surgeons at Asan Medical Center. Clinical pathways have received considerable attention as a tool for recucing the medical practice variation, increasing the efficiency of care process, and improving the quality of care. The aim of this study was to evaluate the effect of a clinical pathway for gastrectomy in gastric cancer patients. Methods : The clinical pathway for gastrectomy was developed and implemented by a multidisciplinary group in Asan Medical Center. A computerized clinical pathway program was developed and revised after a pilot test. A total of 145 patients underwent gastrectomy by three surgeons at Asan Medical Center. We compared the length of hospital stay, patient satisfaction, and unplanned readmission rate between the pre-pathway group(n=67) and the post-pathway group(n=78). We also investigated the degree of satisfaction among the physicians and nurses who were main end-users of the clinical pathway. Results : The clinical pathway was applied to all target patients. The average length of hospital stay was shortened from 12.7days to 10.6days(p<0.01). The degree of patient satisfaction with the care process changed from 90.3% to 89.2% after the implementation of the clinical pathway, but the difference was of satistically significant(p=0.761). Unplanned readmission rate was 2.9% in the pre-pathway group. More than 90% of physicians and nurses answered that the clinical pathway had been a useful tool in their medical practice. Conclusions : The findings of the study demonstrated that implementation of the clinical pathway for gastrectomy produced substantial reduction in the length of hospital stay while improving the quality of patient outcomes. The computerized clinical pathway program can be used as one of the powerful patient management tools for reducing the practice variations and increasing the efficiency of care process in Korea hospital settings.

Forage Yield and Quality of Summer Grain Legumes and Forage Grasses in Cheju Island

Kang, Young-Kil,Cho, Nam-Ki,Yook, Wan-Bang,Kang, Min-Su The Korean Society of Crop Science 1998 Korean journal of crop science Vol.43 No.4

Soybean [Glycine max (L.) Merr.), mungbean [Vigna radiata (L.) Wilcz.], cowpea [V. unguiculata (L.) Walp.], adzuki bean [V. angularis (Willd.) Ohwi & Ohashi], maize [Zea mays L.], sorghum [Sorghum bicolor (L.) Moench], sorghum $\times$ sudangrass [So bicolor intraspecific hybrid], and Japanese millet [Echinochloa crusgalli var. frumentacea (Link) W.F. Wight] were grown at two planting dates (18 June and 15 July) at Cheju in 1997 to select the best forage legumes adapted to Cheju Island for grass-legume forage rotation. Averaged across planting dates and cultivars, dry matter (DM), crude protein (CP), and total digestible nutrient (TDN) yields were 5,646, 1,056, and 3,637 kg/ha for soybean, 4,458, 676, and 2,661 kg/ha for mungbean, 3,289, 553, and 2,055 kg/ha for cowpea, 3,931, 674, and 2,489 kg/ha for adzuki bean, 12,695, 969, and 7,642 kg/ha for maize, 17,071, 1,260, and 8,857 kg/ha for sorghum, 16,355, 1,163, and 8,543 kg/ha for sorghum $\times$ sudangrass hybrid, and 8,288, 929, and 4,091 kg/ha for Japanese millet. Soybean was higher in CP, ether extract (EE), and TON content but was lower in nitrogen free extract content compared with the three other legumes. The legumes had much higher CP (13.7 to 21.9%), EE (2.42 to 6.23%), and TDN (58.7 to 69.9%) content but lower in crude fiber (CF) content (17.3 to 25.3%) than did the grasses tested except maize which had relatively lower CF content but higher TDN content. These results suggest that soybean could be the best forage legume for grass-legume forage rotation in the Cheju region.

Effects of Temperature on Leaf Emergence Rates and Phyllochron of Naked and Malting Barley

Kang, Young-Kil,Ko, Koan-Su,Kang, Bong-Kyoon The Korean Society of Crop Science 1993 Korean journal of crop science Vol.38 No.5

온도가 쌀보리와 맥주보리의 출엽속도와 출엽간격에 미치는 영향을 구명하고자 쌀보리 3품종(능쌀보리, 새쌀보리, 향천과 001)과 맥주보리 3품종(두산 8호, 사천006, 진광보리)을 향온 7수준(4, 8, 12, 16, 20, 24, 28$^{\circ}C$)과 변온 7수준[6/2(명기 / 암기), 10/6, 14/10, 18/14, 22/18, 26/22, 30/$25^{\circ}C$]으로 유지시킨 생장상에서 4엽기까지 키우면서 매일 주간엽수를 조사하여 출엽속도 및 출엽간격를 산출한 결과를 요약하면 다음과 같다. 항온과 변온에 관계없이 공시품종 모두 동일 온도내에 있어서는 출아후 일수가 증가됨에 따라 주간 출엽수도 직선적으로 증가되었다. 평균기온 28$^{\circ}C$를 제외하고는 출아속도와 출아간격이 항온과 변온간에 현저한 차이를 보이지 않았다. 출아속도와 출아간격은 품종간에 유의한 차이가 있었고 동일 품종내 온도간에도 현저한 차이가 있었다. 평균기온이 증가됨에 따라 일당 출아속도는 출아 최적온도까지 곡선적으로 증가된 다음 감소되었는데, 6품종의 출아 최적온도는 20.1~21.5$^{\circ}C$로 품종간 현저한 차이는 없었으나 출아 최적온도에서의 출엽속도는 쌀보리가 0.202~0.226엽/일, 맥주보리가 0.231~0.241엽/일으로 맥주보리가 큰 경향이었다. 평균이온이 증가됨에 따라 유효적산온도당 출엽속도는 지수함수적으로 감소되었고, 출엽간격(일엽당 적사온도)은 지수함수적인 증가를 보였는데, 6품종의 평균 출엽간격은 4$^{\circ}C$에서 46.2GDD/엽, 28$^{\circ}C$에서 129.3GDD/엽이었다. Three naked and three malting barley cultivars were grown at constant temperatures of 4, 8, 12, 16, 20, 24 and 28$^{\circ}C$, and day/night temperatures of 6/2, 10/6, 14/10, 18/14, 22/18, 26/22 and 30/26$^{\circ}C$ through the fourth leaf stage in growth chambers to determine the effects of the temperature on leaf emergence rate and phyllochron in naked and malting barley seedlings. The number of leaves per main stem was recorded daily from the first leaf stage to the fourth. At a given temperature, the emergence of new leaves was a linear function of time for all cultivars. There were no great differences in leaf emergence rate and phyllochron between constant and variable day/night temperature regimes except at 28$^{\circ}C$. Leaf emergence rate and phyllochron significantly differed among cultivars and among mean temperatures within cultivars. For all cultivars, leaf emergence rate per day increased parabolically with increasing mean air temperature until an optimum temperature was reached and then declined. There were no differences in the optimum temperatures for the leaf emergence rate per day among six cultivars, which ranged 20.1 to 21.5$^{\circ}C$. The leaf emergence rates at the optimum temperatures ranged 0.202 to 0.226 leaves / day for naked barley cultivars and 0.231 to 0.241 leaves / day for malting barley cultivars. As temperature increased, leaf emergence rate per GDD decreased exponentially and the phyllochron (GDD/leaf) increased exponentially. The mean of the phyllochron for six cultivars was 46.2 GDD at 4$^{\circ}C$ and 129.3 GDD at 28$^{\circ}C$. These results suggest that the temperature and cultivar effects must be considered for prediction of leaf development in barley.