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李鐵泰,玄聖鎬,徐中錫,柳榮鴻 단국대학교 1992 論文集 Vol.26 No.-
The reactions between vanadium pentoxide and ammonium chloride were investigated to find a new separation method of NH_3 and HCl from ammonium chloride. In this NH_4Cl-V_2O_5 reaction systems, both chlorination and reduction of V_2O_5 were proceeded by HCl(g) and NH_3(g) from decomposed NH_4Cl, respectively. The experimental results showed the possibility for the separation of NH_3 and HCl from NH_4Cl. 84.85% of HCl was recovered from the decomposed NH_4Cl at the conditions of reaction temperature : 400℃, NH_4Cl weight raatio ; 8.0, Ar gas flow rate 100㎤/min
진행파를 이용한 디지탈 거리 계전기법의 고장발생각에 따른 고장거리 산출 보정에 관한 연구
정주환,서희석,김철환,신명철 成均館大學校 科學技術硏究所 1992 論文集 Vol.43 No.1
For many years digital protective methods have employed for the calculation of transient phenomena on power system networks caused by faults. This paper presents a travelling wave digital protection scheme to be used as an ultra high speed EHV/UHV transmission line relay. A detection of fault is made by a highly reliable relaying algorithm which makes use of the modal components of the voltage and currents which are caused to be superimposed on the steady state prefault power frequency components following the fault inception. Some of the potential problems and limitations associated with fault angles are achieved using correction factor. Varification of the algoithm is presented through digital computer numerical simulation using electromagnetic transients program(EMTP).
사망진단서(사체검안서) 상의 선행사인으로부터 사망통계의 원사인이 선정되는 비율 : 3개 대학병원에서 교부된 사망진단서를 중심으로
박우성,박석건,정철원,김우철,탁우택,김부연,서순원,김광환,서진숙,부유경 한국의료QA학회 2004 한국의료질향상학회지 Vol.11 No.1
Background : To exatnine the problems intolved in writing practice of death certificates, we cotnpated the determination of underlying cause of death for wital statistics using recorded underlying cause of death in issued death statistics. Methods : We collected 688 rnortality certificates issue in year of 2,000 from 3 university hospitals. And we also collected vital statistics from ministry of statistics. The causes of death were coded by experienced medical record wpecialists. And causes of death determined at ministry of statistics for national vita statistics were mapped to causes of death recorded at each death certificates. The rate that underlying causes of death for vital statistics were derived from underlying causes of death recorded at issued death certificaties sere analysed. Results : 64.5% of underlying cause of death for could be derived from underlying cause of death recorded at issued death certificates, 8.6% derived from intermediate cause of death, and 3.9% derived from direct cause of death. In 23% of cases, underlying cause of death could not be derived using issued death certificates. The rate that underlying cause of death for vital statistics could be derived from underlying cause of death recorded at death certificates was different between 3 university hospitals. Ane the rate was also different between death certificates and postmortem certificates. We classified the causes of death using 21 major categories. The rate was different between diseases or conditions tha caused death too. Conclusion : When we examined the correctness of death certificate writing practice using abpve methods, cortectness of writing could not be told as satisfactory. There was difference in correctness of writing between hospotals, between death certificates and postmortem certificates, and between diseases and conditions that caused death. With this results, we suggested some strategy to improve the correctness of death certificate writing practice.
개선된 다출력 동적 CMOS 설계 방식을 이용한 고성능 32 비트 CLA가산기 설계 및 구현
송근호,방만식,서정훈,한석붕,이효상,김강철 慶尙大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.13 No.-
In this paper, we designed, implemented and evaluated 32-bit CLA adder with the ENMODL(enhanced NORA Multiple Output Domino Logic) logic style which is new dynamic CMOS logic. The circuit is implemented using 0.8㎛ CMOS double-metal process technology. It operates stably and the addition time is less 3.9 ns. The ENMODL logic style can improve the performance in the high-speed computing circuits depending on the degree of recurrence.
장광미,강창희,서명석,허철구,박경윤,이호근,김영준 濟州大學校 基礎科學硏究所 1996 基礎科學硏究 Vol.9 No.2
A study has been performed on the characteristics of rural and urban surface ozone concentration for the period of March 1992 to February 1993. The monitoring station of rural ozone is located at Kosan, Cheju and other urban monitoring stations are located at Seoul, Pusan and Kwangju. Rural's and urban's ozone data exhibit a distinct features in many ways. First, annual mean of rural ozone concentration is very high(42 ppbv) but urban's are very low(10~15 ppbv). Second, rural ozone data shows a seasonal variation with it's maximum in spring, and minimum in summer, but urban's show a seasonal variation with it's maximum in spring, and minimum in winter. Third, diurnal variation of rural data is very small but that of urban's are very large. Fourth, monthly mean of daily minimum of rural data is not low and shows a large seasonal variation, but those of urban's data are extremely low(<3 ppbv) and have no seasonal variations.
장광미,이호근,강창희,허철구,박경윤,서명석 濟州大學校 基礎科學硏究所 1996 基礎科學硏究 Vol.9 No.2
Atmospheric aerosols were collected by a High Volume Tape Sampler from March 1992 to December 1993 at Kosan, Cheju, korea. The water soluble ion concentrations in aerosol were analyzed. The concentrations of cations(Na+, K+, Ca²+, Mg²+, NH₄+) were determined by an Inductively Coupled Plazma(ICP) or an Atomic Absorption Spectrometer(AAS), and those of anions(Cl-, NO₃-, SO₄²-) were analayzed by the capillary electrophoresis method. The Ca²+, SO₄²-and NO₃- concentrations in spring were higher than those in other seasons. The lowest concentrations of these elements were found in summer, largely due to scavenging by frequent rains. Especially the ca²+ concentration on April was three to four times higher than the annual mean concentration. The enrichment factor(E.F.) of each element was calculated. The annual mean E.F. values of the Ca²+, Mg²+ and Cl- in 1992 were the same as those in 1993 except K+ and SO₄²-. The correlation formula between all cations and anions for the whole period was Anions=0.759xCations+0.066.
Treatment Results of Radiation Therapy in Laryngeal Cancer
Kay, Chul Seung,Lee, Kyung Shik,Kang, Ki Mun,Yoon, Sei Chul,Suh, Byung Do,Kim, Hoon-Kyo,Suh, Tae Suk,Jang, Hong Seok,Kim, Min Sik,Shinn, Kyung Sub CATHOLIC MEDICAL CENTER 1995 Bulletin of the Clinical Research Institute Vol.23 No.1
To analyse our 8 year experience of laryngeal cancer patients who treated with radiation therapy (RT), a retrospective analysis was performed in all patients but 3 ones treated below 20 Gy. From March 1983 to December 1990, one hundred and six patients with laryngeal cancer were treated with RT at the Department of Therapeutic Radiology, Kangnam St. Mary's Hospital, Catholic University Medical College. All patients were treated with a 6 MV linear accelerator and delivered in a daily 1.8-2 Gy/fraction, 5 days per week, leading to a total dose of 65-70 Gy/7-8 weeks in RT alone and 50-60 Gy/5-6 weeks in postoperative adjuvant RT. Three patients who treated below 20 Gy, were excluded from this analysis. The male to female ratio was 100 to 3 with median age of 60 years (range: 45 to 79 years). One hundred and three patients had a minimum 2.5 year follow-up (range: 2 to 117 months) and 82 (80%) patients of them had over five year follow-up. The 5 year overall survival rate of all 103 patients was 49%: Glottic and supraglottic cancer were 59% and 29%, respectively (P=0.01). The survival rates by tumor staging were as follows; In glottic cancer, the overall 5 year survival rate was 85% for stage Ⅰ, 64% for stage Ⅱ, 38% for stage Ⅲ, 41% for stage Ⅳ (P=0.01). In supraglottic cancer, the overall 5 year survival rate was 29% for stage Ⅲ, 22% for stage Ⅳ (P=0.5). Although the degree of histologic differentiation had no significant difference in survival, the well differentiated carcinomas had higher survival rate than those with moderately differentiated or poorly differentiated carcinomas (P= 0.057). According to the treatment modality, glottic cancer had a 5 year survival rates of 60% for RT alone and 71% for postoperative adjuvant RT (P==0.37), those of supraglottic cancer had 20% for RT alone, 67% for postoperative adjuvant RT and 14% for combined chemo-therapy and RT respectively (P^O.03). The most common acute complications during RT in decreasing order of frequency were dysphagia (83%), dry mouth (42%), appetite loss (22%), dry cough (20%). Our experience of laryngeal cancer treated with RT results in overall survival rates comparable to other studies in literatures with acceptable complication rate. The survival rates of glottic cancer by treatment modality were not statistically different (P=0.37), but in supraglottic cancer, postoperative RT was superior to RT alone or RT with chemotherapy (P=0.03). Glottic cancer is well treated by RT or various conservative surgical procedures, so RT is recommendable first treatment modality for the preservation of voice function, especially in the early glottic cancer. But supraglottic cancer is likely to be treated by multimodality treatment, and this idea generates further interest in the modification of RT schedule and combined chemotherapy or surgery to increase local control and survival rate.