공간벡터 PWM의 과변조 영역에서 출력전압 선형화

배장호,김연충,원충연,최종묵,기상우,배기훈,Bae, Jang-Ho,Kim, Yuen-Chung,Won, Chung-Yuen,Choi, Jong-Mook,Gi, Sang-Woo,Bae, Gi-Hun 대한전자공학회 1999 電子工學會論文誌, S Vol.s36 No.11

본 논문은 6-스텝까지 인버터의 선형제어영역을 넓히기 위한 공간전압 변조방법의 선형화 기법에 대해 제안하였다. 이 방법은 인버터에서 발생시키고자 하는 전압을 연속모드에서는 보상각을 얻기 위해서 6스텝 모드를 포함하는 불연속모드에서는 불연속 스위칭이 이루어지도록 하는 유지각을 얻기 위해서 퓨리에 급수를 이용하고 있다. 이 각들의 근사화 수식들을 과변조 영역에서 기본파 전압을 보상하기 위해 사용하였다. 따라서, PWM 인버터 출력전압의 최대 활용과 선형 제어를 이룰 수 있다. This paper proposes a linearization technique for the space vector modulation method, which increases the linear control range of inverter up to the 6-step inverter. This method is based on fourier series expansion of the desired output voltage of the inverter to calculate the compensation angle in continuous switching mode and holding angle in discontinuous switching including the 6-step mode respectively. The approximation equation of these angles are used for compensation of fundamental voltage in overmodulation range. Therefore, it is possible to obtain the linear control and the maximized utilization of PWM inverter output voltage.

췌장 가성낭종에 의한 이차성 식도이완불능증 1 예

배장호(Jang Ho Bae),허규찬(Kyu Chan Huh),조광범(Kwang Beom Jo),황재석(Jae Seok Hwang),강영우(Young Woo Kang) 대한내과학회 1995 대한내과학회지 Vol.49 No.5

Achalasia of the esophagus is a motor disorder characterized by loss of the lower esophageal peristalsis, failure of the lower esophageal sphincter to relax normally, and a high resting pressure at the lower esophageal sphincter. 2%-4% of achalasia cases are of the secondary variety, of which gastric adenocarcinoma is by far the most common. Benign causes are rare and an association with pancreatic pseudocyst has never been made except one case, This report describes a case of secondary achalasia associated with pancreatic pseudocyst, who presented with clinical, manometric, endoscopic, and radiographic features of achalasia. Relationship between achalasia and pancreatic pseudocyst was confirmed by restoration of normal esophageal function after external drainage of the pseudocyst.

악성 식도협착에서 금속제 자가확장형 StreckerTM 인공식도관의 내시경 삽입술

배장호(Jang Ho Bae),강영우(Young Woo Kang) 대한내과학회 1995 대한내과학회지 Vol.49 No.6

Objectives: Endoscopic intubation is well established as a cheap, durable, and prompt effective procedure for palliation of malignant dysphagia, and also have an advantage in short stay in hospital. However, with conventional plastic tube protheses, esophageal intubation continues to be plagued by high morbidity and mortality as well as limited effectiveness in the relief of dysphagia. We discribed an experience with metallic self-expanding StreckerTM esophageal stent placement in patients with malignant esophageal obstruction. Methods: From July 1993 to November 1994, twelve consecutive patients with severe dysphagia due to malignant esophageal obstruction were treated with metallic self-expanding StreckerTM esophageal stent(Boston Scientific®). Thirteen stents were placed in twelve patients. Results: 1) Marked reduction of dysphagia was noted in all patients the day after stent insertion, and most of the patients received a normal diet thereafter. Macroscopically obvious ingrowth of tumor through the stent mesh was seen at endoscopy in four patients at 1 to 5months after insertion of the stent. But, These stents were successfully recanalized with endoscopic balloon dilatation and second stent insertion, And then improvement has been sustained for the mean follow up duration, 28.5±17.7weeks. 2) These were several complications such as, chest pain(3patients) and bleeding(2patients) during stent placement, and tumor ingrowth(4 patients)and perforation(1patients) after stent placement. But all these complication were successfully treated with several managements such as esophageal ballon dilatation, second stent placement, and supportive care, except perforation. A case complicated by perforation was died of mediastinitis and sepsis four weeks after implantation, but caused by preimplantation esophageal balloon dilatation. 3) The mean survival duration(±SD) was 20.2±10,2 weeks and 37.4±18.6 weeks in six died and five survived patients, respectively. Conclusion: Endoscopic insertion of metallic self-expanding StreckerTM stent was a safe and effective procedure for palliative treatment of malignant esophageal strictures. However, newly designed stent should be developed to overcome tumor ingrowth.

급성관동맥 증후군과 취약성 경화반

배장호 ( Jang Ho Bae ),송인걸 ( In Geol Song ) 대한내과학회 2010 대한내과학회지 Vol.79 No.3

Acute coronary syndrome (ACS) consists of unstable angina, non-ST segment elevation myocardial infarction (NSTEMI), and STEMI. The pathology underlying ACS is acute thrombosis in a coronary artery, which is usually caused by plaque rupture in a mild stenotic lesion. A rupture-prone plaque is known as a vulnerable plaque (VP), although recently the definition of VP has been expanded to include rapidly progressive plaque. Although no single method can predict future cardiac events in mild stenotic lesions, there have been big advances in detecting VP, such as virtual histology-intravascular ultrasound and optical coherence tomography. These techniques look for thin cap fibroatheromas, which is the most common type of VP, characterized by a thin fibrous cap <65 μm, a large necrotic core, and marked macrophage infiltration of the fibrous cap. The recent concept of VP, the methods for detecting VP, and the treatment of VP are discussed. (Korean J Med 79:241-249, 2010)

Medical Therapy & Peri-procedural Medication

Jang-Ho Bae(배장호) 대한인터벤션영상기술학회 2009 대한인터벤션영상기술학회지 Vol.12 No.1

다분절 경추 유합 및 내고정 수술결과

전우열,배장호,정병우,김성호,김오룡,최병연,조수호,Jeon, Woo-Youl,Bae, Jang-Ho,Jung, Byoung-Woo,Kim, Seong-Ho,Kim, Oh-Lyong,Choi, Byung-Yon,Cho, Soo-Ho 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.1

Objective : The purpose of the present study was to examine neurologic changes, fusion rate and degree of kyphosis from the surgical results of those patients who underwent multi-level anterior interbody fusion and internal fixation. Methods : Among 63 cases of the patients who received multi-level anterior interbody fusion and internal fixation in 5 years between 1995 to 1999 at the neurosurgery department, we performed a retrospective study in 52 cases that could be followed up with dynamic view imaging ; the results were compared and analyzed. The analysis was based on the results of history taking, physical findings and radiologic findings, and Odom criteria were used to classify those cases with neurologic changes. Results : Among those 52 cases in whom the follow-up was possible for at least a year and dynamic view imaging was possible, bone fusion was seen in 93% of the trauma cases and 95% in the non-trauma cases and overall bone fusion was observed in 94% of the cases. Bone fusion was seen in 93% of the autobone cases, 95% of the allobone cases, and 94% of the Mesh cases. Radiologic changes were observed by comparing the lateral view after surgery ; kyphosis was seen in 53% of the autobone cases, in 70% of the allobone cases, and in 35% of Mesh cases ; in 45% and 60% of the non-trauma cases and trauma cases, respectively ; and in 55% of the 2 level fusion cases and 46% of the 3 level fusion cases. Neurologic changes classified according to Odom criteria showed excellent result in 48% of all the cases, good in 23%, fair in 4%, and poor in 25%. Conclusion : Even those cases with multi-level fusion, a high fusion rate could be obtained by performing anterior interbody fusion and internal fixation ; those cases with kyphosis were related more with the presence or absence of posterior compartment injury rather than the fusion level ; and those trauma cases showed not much difference in the fusion rate compared with non-trauma cases but had a high possibility of kyphosis.

Hα 방출선을 통한 Be 항성 원반

안대건,배장호,이상각,신영우,고연경,강석철,Ahn, Dae-Gun,Bae, Jang-Ho,Lee, Sang-Gak,Shin, Young-Woo,Ko, Yeon-Gyung,Kang, Suk-Chul 한국천문학회 2007 天文學論叢 Vol.22 No.4

서울대학교의 61cm 망원경에 SGS 분광기를 부착하여 4개의 Be 항성에 대한 분광 관측을 수행하였다. 관측으로부터 얻은 각 항성의 $H{\alpha}$ 등가폭은 HD 5394가 $-26.4{\AA}$, HD 10516이 $-27.7{\AA}$, HD 200120이 $-10.2{\AA}$, HD 202904가 $-18.2{\AA}$이다. 이로부터 Grundstrom & Gies (2006)가 제시한 $H{\alpha}$ 방출선의 등가폭과 수소 방출선 영역의 크기 관계를 이용하여 구한 원반의 수소 방출선영역의 크기는 HD 5394가 $6.7{\pm}0.3R_{H{\alpha}}/R_s$, HD 10516이 $8.2{\pm}0.4R_{H{\alpha}}/R_s$, HD 200120이 $6.0{\pm}0.4R_{H{\alpha}}/R_s$, HD 202904가 $4.1{\pm}0.1R_{H{\alpha}}/R_s$이었다. HD 5394와 HD 10516에 대한 결과는 $H{\alpha}$ 간섭 관측으로부터 얻어진 결과와 약 20% 정도 차이가 났다. 항성의 광구에서 발생한 $H{\alpha}$ 흡수선의 등가폭을 정밀하게 보정하고, Grundstrom & Gies (2006)의 모형이 좀더 현실적으로 개선되며 정확한 항성 물리량 (유효온도, 원반 경사각, 원반 전체 크기)을 적용할 경우, 보다 정확한 원반크기를 구할 수 있을 것이다. 따라서 본 연구에서는 61cm 구경의 반사망원경과 범용의 중분산 분광기를 활용한 분광관측으로도 충분히 Be 항성의 원반 변화에 대한 연구를 수행할 수 있다는 것을 제시하고 있다. We have determined the disk size of Be stars by using $H{\alpha}$ emission. We observed spectra of Be stars with telescope in SNU, equipped with SB SGS (Santa Babara Self Guided Spectrograph) and CCD ST-8. The size of disk of Be stars was estimated with the Be star model of Grundstrom & Gies (2006). This study suggests that the medium resolution spectra taken with small telescope equipped with commercial spectrograph are useful to estimate the approximate size of the $H{\alpha}$ emitting disk around Be stars.

Variable Impedance Control and Fuzzy Inference Based Identification of User Intension for Direct Teaching of a Mobile Robot

고종현(Jong Hyeon Ko),배장호(Jang Ho Bae),홍대희(Daehie Hong) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.8

일부 60~64세 농촌노인에서 음주양상과 음주양상과 혈압과의 관련성

이무식(Moo-Sik Lee),배장호(Jang-Ho Bae),박기락(Ki-Rack Park),이충원(Choong-Won Lee) 한국농촌의학 지역보건학회 2001 농촌의학·지역보건 Vol.26 No.1

경접형골동으로 수술한 뇌하수체 선종의 치료성적

전우열,김오룡,김성호,배장호,최병연,조수호,Jeon, Woo-Youl,Kim, Oh-Lyong,Kim, Seong-Ho,Bae, Jang-Ho,Choi, Byung-Yon,Cho, Soo-Ho 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.11

Objective : Transsphenoidal approach(TSA) has been used as useful operative method for pituitary tumor but is still controversal in case of cavernous sinus invasion or severe suprasellar extension. This study was performed to evaluate the surgical result, recurrence, effect of adjuvant treatment, especially in cases of suprasellar extension or cavernous sinus invasion. Material and Methods : We studied 56 cases of surgically treated pituitary adenoma that we were able to follow up, treated by TSA from 1993 to 1998. There were 24 cases of suprasellar extension and 11 cases of cavernous sinus invasion. The medical records and radiological findings were reviewed. Surgical results including hormonal function and recurrence rates were analyzed according to extent of tumor invasion. Mean follow-up period was 19.1 months. Results : Tumors with suprasellar extension were removed totally in 54%, whereas total tumor removal was possible only in 38% with cavernous sinus invasion. Overall of recurrence rate was 14% and recurrence rate was 25% in suprasellar extension and 9% in cavernous sinus invasion. In cases of both suprasellar extension and cavernous sinus invasion, tumors that were treated by TSA and radiation showed recurrence rate of 7%, whereas those treated by surgery alone showed 28% of recurrence. Conclusion : Transsphenoidal approach is safe and useful operative method for pituitary adenoma and adjuvant therapy including radiation therapy is effective means to decrease the recurrence in cases of suprasellar extension or cavernous sinus invasion.