http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
TMS320F240을 이용한 BLDC 전동기의 리플저감에 대한 연구
노광호(Kwang-Ho Roh),김용(Yong Kim),이승일(Seung-Il Lee),조규만(Gyu-Man Cho),이규훈(Kyu-Hun Lee) 한국조명·전기설비학회 2000 한국조명·전기설비학회 학술대회논문집 Vol.2000 No.-
This paper presents a ripple reduction of BIDC motor using TMS320F240. A fault of permanent magnet(PM) BLDC motor possible to miniaturization and high-output is to be difficult to reduce speed-ripple at low speed region. An existing solution is to be use of PWM waveform by PI control with computing control angle of 60°. The new family of DSP controllers provides a single chip solution by integrating on-chip not only a high computational power but also, all the peripherals necessary for electric motor control. This paper gives an advanced solution of the SVPWM technique for the purpose of reducing control angle rather than 60°. This technique gives an excellent speed ripple characteristic.
혈액투석 환자에 있어 투석 간격시간 및 투석중 칼륨 제거량이 혈중 칼륨 농도에 미치는 영향
김호중(Ho Jung Kim),노광호(Kwang Ho Roh),이경원(Kyung Won Lee),김진영(Jin Yeong Kim),유준호(Joon Ho Ryu),문중돈(Joong Don Moon),박일규(Il Gyu Park) 대한신장학회 2000 Kidney Research and Clinical Practice Vol.19 No.1
N/A To evaluate potassium(K) homeostasis during in-terdialytic and dialytic phases in chronic hemodialysis patients, we analyzed pre- and post- dialysis plasma K concentration(n=28) over n week with an interdialytic interval of 7Zhrs, 48hrs(l), and 48hrs(II), respectively, and the quantity of total dialytic K removal via dialysate. The predialysis plasma K at 72h interval(prePK72h: 4.89±0.17mEq/L) was significantly higher than those at 48h interval(prePK48h-I: 4.57±0.15mEq/L, and prePK48h-II: 4.40±15mEq/L) (p=0.000, p=0.000). 10.7% in prePK72h were categorized into severe hyperkalemia more than 6.0mEq/L, but none in prePK48h-I, II(p=0.000, p=0.000). In contrast no difference between 72-h and 42-h intervals was found in the postdialysis plasma K(postPK72h: 3.59±0.07 vs postPK48h-I : 3.530±08mEq/L, p>0.05) and in the quantity of total dialytic K removal via dialysate(ΔKtota172h : 74±2.6 vs ΔKtota148h-I:71±2.2mEq, p>0.05). On approach to this with two-compartment model, there was significant difference in dialytic K removal from ECF(ΔKecf72h:22.2±1.6 vs ΔKecf48h-I:17.7±1.6mEq, p<0.01), but not in that from ICF(ΔKicf72h:51.6±3.1 vs ΔKicf48h-I: 53.5±2.7mEq, p>0.05). In all 28 patients, age, sex and body weight were not correlated with either pre- and post- plasma K levels or total K removal per kg body weight. In conclusion, the majority of dialytic K removal is from the replenishment of the ICF potassium and it has rather constant feature in that there was no autoregulatory increment even with the higher predialysis plasma K concentration. So the plasma K concentration on chronic maintenace hemodialysis is more dependent on the potassium gain during interdialytic phase than the potassium removal during dialytic phase. Also it is reasonable to restrict dietary K intake and apply K-exalate orientating to the interdialytic phase of 72hrs because severe hyperkalemia is rare in that of 48hrs.
Trimethoprim / Sulfamethoxazole ( TMP / SMX ) 을 복용 중인 외래 환자에서 발생하는 경구 칼륨 투여 후 칼륨 대사 장애
최춘식(Chun Sik Choi),유영조(Young Jo Yoo),김태영(Tae Young Kim),민경환(Kyung Hwan Min),한상웅(Sang Woong Han),노광호(Kwang Ho Roh),양성규(Seong Kyu Yang),유준호(Jun Ho Yoo),오석중(Suk Joong Oh),문중돈(Jung Don Mun),김호중(Ho Jung Ki 대한내과학회 1999 대한내과학회지 Vol.57 No.1
N/A TMP/SMX has been shown to cause hyperkalemia in a few outpatients on standard-dose. This prospective study was aimed at investigating other associated factors inducing clinically important hyperkalemia in outpatients on standard-dose of TMP/SMX. Methods : Age-matched diabetic(n=22) and non-diabetic (n=20) patients with UTI on standard dose of TMP/SMX for 5 days were given acute oral intake of 40 mEq of potassium chloride(KCl). Results : Before the intake of TMP/SMX, basal levels of serum potassium(K), serum BUN and creatinine, plasma renin activity(PRA), aldosterone(PA), and transtubular potassium gradient(TTKG) were comparable between diabetic and non-diabetic subjects. Also after TMP/SMX was taken, all parameters didnt reveal any overt changes except a slightly increased serum K but not significantly (from 4.20±0.15 to 4.14±0.21mEq/L in non-diabetics; from 4.13±0.18 to 4.25±0.13mEq/L in diabetics). Following acute oral KCl load, however, the peak increases of serum K changes were significantly higher in diabetics compared to non-diabetics(0.34 0.06 vs 0.62 0.09mEq/L, p<0.01). Furthermore, 8 out of 22 diabetics but none of non-diabetics after acute KCl load developed hyperkalemia(> 5.0 mEq/L). After KCl load, PRA did not show any significant changes, whereas PA was increased simultaneously with the increments of serum K in both diabetic subgroups hyperkalemic(n=8) and normokalemic (n=14) diabetics. But increment was blunted in hyperkalemic diabetic subgroup. TTKG was increased prominently in normokalemic diabetic subgroup(9.20 from 4.50), while it was slightly increased in hyperkalemic diabetic subgroup(4.63 from 3.79mEq/L). There was statistical difference between two subgroups(p < 0.05). In conclusion, Besides the known effect of blocking sodium channels in distal K secreting cells by TMP/SMX, insulinopenia(DM). Hypoaldosteronism with its decreased tubular bioactivity, and increased exogenous K intake in concert could cause clinically overt hyperkalemia on standard-dose of TMP/SMX. When standard- dose of TMP/SMX is administered to patients with deranged K homeostasis, especially to diabetics with hypoaldosteronism, blood K level should be monitored meticulously to avoid hyperkalemia.
혈액투석 환자와 영양결핍 환자에서 총 칼슘, 알부민 농도, pH를 이용해 계산된 혈청 이온화 칼슘의 낮은 예측도
이경원,김호중,노광호,양성규,한상웅,민경환,유준호 대한신장학회 1999 Kidney Research and Clinical Practice Vol.18 No.6
This study was aimed to assess the free calcium status with or without its direct measurement in patients on hemodialysis(HD: n=27) and malnourished ones from extrarenal diseases(MN: n=14). It was performed by the comparison of measured free calcium (Ca^++m) levels by gas analyzer and calculated free calcium(Ca^++c) levels based on those of total calcium (TCa), albumin, and pH with the modified algorithm invented by Moore(J Clin Invest. 49:318, 1970). Of 27 HD pts, 14(5296) had low[Ca^++m] below 1.05mmol/L despite only 2(796) with low [TCa] below 2.05mmoV L, whereas 14 MN pts had similar numbers between low[Ca$quot;m] and low[TCa]. Compared to MN pts, HD pts showed significantly lower mean levels(SE) of pH(7.37 0.01 vs. 7A4 0.01, p$lt;0.01), higher[TCa](2.33 0.04 vs. 1.83 0.08mmol/L, p$lt;0.01), and higher albumin (4.33 0.06 vs. 2.59 0.17mg/dL, p$lt;0.01).However, [Ca^++m] between 2 groups did not reveal any significant difference. Furtherrnore, in total 41 pts of 2 groups, no similarity was observed between the values of [Ca^++ml and [Ca^++c] but with their significant difference(p$lt;0.05). Only[TCa] was significantly correlated with albumin level(r=0.73, p$lt;0.01). Furthermore, multiple regression analysis between [Ca^++m] and other factors including pH and albumin didn't show any correlation. In conclusion, this data suggests that relatively high prevalence of low values of physiologically important free ionized calcium in chronically ill pts, especially on maintenance HD, could be missed when predicted on total calcium level, and pH without its direct measurement.
급성 췌장염에서 발생한 동정맥류를 동반한 가성동맥류 1예
김기찬,박경남,김용수,이용욱,이민호,최호순,윤병철,박충기,노광호,이동후,손주현,기춘석,함준수,손영우,전용철,오석중 대한소화기학회 2000 대한소화기학회지 Vol.35 No.3
We report a case of pancreatic pseudoaneurysm accompanying aterio-venous fistula in a patient with acute pancreatitis. Non-contrast-enhanced computed tomography showed a mass like lesion in the pancreatic head portion. Dynamic contrast-enhanced computed tomography showed a contrast- enhancing mass, aneurysmal dilatation of mesenteric vessels, venous obstruction due to thrombus and multiple collateral vessels. Angiography showed an aneurysmal dilatation of superior mesenteric artery (3.5×4 cm sized), abrupt cutoff of the contrast-filled vein due to the total obstruction of proximal portion of portal vein and superior mesenteric vein, and the partial obstruction of splenic vein. Dynamic computed tomography and angiography revealed a pseudoaneurysm with aterio- venous fistula from the superior mesenteric artery. Transcatheter embolization with steel microcoil failed to treat pseudoaneurysm. However, spontaneous improvement was observed in the subsequent dynamic computed tomography.