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전력 소모를 감소시키기 위한 게이트 크기 재결정에 관한 알고리즘 연구
鄭均樂,李炯日 弘益大學校 科學技術硏究所 1999 科學技術硏究論文集 Vol.10 No.1
The gate resizing is the problem of finding load drive capabilities of all gates such that a given delay limit is satisfied and the total cost in terms of area and/or power consumption is minimal. After this step, power consumption can be further reduced by gate resizing - larger gates are replaced by smaller ones that have higher delay but lower power consumption and the circuits timing constraints are still obeyed. In this paper, we have proposed new algorithm for gate resizing problem which is superior to Chen's algorithm.
자기동조 PID제어기에 의한 전력계통 안정화에 관한 연구
정형환,김상효,이광우 東亞大學校 大學院 1994 大學院論文集 Vol.19 No.-
A new technique for the exitation control of synchronous generator is presented in this paper. The proposed technique employs a self-tuning proportional-integral-derivative(PID) power system stabilizer in order to improve the dynamic performance of a synchronous machine. The self-tuning-regulator(STR) PID using recursive-least-squares(RLS) estimated K? K?, K? Gains. A application voltage control of power system terminal voltage deviation, angular velocity deviation, and rotor angle deviation considered dynamic. Simulation results establishment that proposed STR PID control technique superiorited conventional PSS(power system stabilizer) control.
원종진,이종선,윤희중,김형철 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
This study is object to structural analysis of high pressure injection nozzle. The finite element model was developed to compute the stress, strain for high pressure injection nozzle. For structural analysis using result from FEM code. This structural analysis results, many variables such as internal pressure, boundary condition, constraint condition and load condition are considered.
김정동,이기욱,조홍석,한수형,구명화 목원대학교 건축도시연구센터 2003 建築·都市環境硏究 Vol.11 No.-
As the first female artist of Western painting in the modern times, Hey-seok Na is the historical figure in Suwon, who went ahead of the times. Suwon City established the street of Hey-seok Na to commemorate her, in Ingye-dong, Paldal-gu. Street-establishment business for the historical figures is one of the factors with the biggest effects for the creation of local cultures. It has many merits such as the offer of fine view of city and resting area as well as giving the pride and educational effects to its residents. However, there are memorial hall or exhibitional hall not established in the street of Hey-seok Na, with the lacks in attractions and convenience facilities. With a poor decorative arrangement in the vicinity of the street, the meaning of street establishment and the image of Hey-seok Na are not well-delivered. Accordingly, the initial plan to make the street with citizens has not been well carried out. This research classified and analyzed the achievements and thoughts of Hey-seok Na, to embody it as the image and the concept of design to be expressed for the street was picked out. As a result, the image of Hey-seok Na, as the historical figure was set at modern times. the existing facilities in the street of Hey-seok Na was analyzed, centering on the time-factor of the modern times, deciding the spacial goal pursued by the street along with things to be improved.
고립성 폐결절의 조직학적 진단에 있어서 경기관지폐생검의 진단적 가치
김치훈,김정주,왕준호,연규민,김형수,리원연,용석중,신계철 건국대학교 의과학연구소 2002 건국의과학학술지 Vol.12 No.-
Transbronchial lung biopsy(TBLB) is a relatively simple and convenient diagnostic tool in solitary pulmonary nodule(SPN) on chest radiograph, which is cannot be diagnosed through routine tests. To investigate the diagnostic value and diagnostic rate of TBLB according to the variable factor, we analyzed 69 patients with radiologically SPN lesion on chest radiograph which was confirmed histologically. A histologic diagnosis of TBLB was made in 47 of 69 patients(68.1%), in which 26 of 37(70.3%) with malignancy and 21 of 32(65.6%) with benign lesion. There were no significant differences in diagnostic yield according to age, sex and location of the lesion. The diagnostic rate tended to increase with the more than 5 pieces to acquired by TBLB. When the size of SPN was less than 3 ㎝, it cannot be diagnosed. In conclusion, TBLB is a diagnostic procedure with good yield and safety, but percutaneous needle aspiration, transbronchial needle aspiration, and bronchial washing fluid cytology may be a complementary procedure to overcome the limitation of TBLB and get higher diagnostic yield for SPN.
Chong, Jong-Yun,Kim, Dong-Won,Jwa, Cheol-Su,Yi, Hyeong-Joong,Ko, Yong,Kim, Kwang-Myung The Korean Neurosurgical Society 2008 Journal of Korean neurosurgical society Vol.43 No.2
Objective: Delayed ischemic deficit or cerebral infarction is the leading cause of morbidity and mortality after aneurysmal subarachnoid hemorrhage (SAH). The purpose of this study is to reassess the prognostic impact of intraoperative elements, including factors related to surgery and anesthesia, on the development of cerebral infarction in patients with ruptured cerebral aneurysms. Methods: Variables related to surgery and anesthesia as well as predetermined factors were all evaluated via a retrospective study on 398 consecutive patients who underwent early microsurgery for ruptured cerebral aneurysms in the last 7 years. Patients were dichotomized as following; good clinical grade (Hunt-Hess grade I to III) and poor clinical grade (IV and V). The end-point events were cerebral infarctions and the clinical outcomes were measured at postoperative 6 months. Results: The occurrence of cerebral infarction was eminent when there was an intraoperative rupture, prolonged temporary clipping and retraction time, intraoperative hypotension, or decreased $O_2$ saturation, but there was no statistical significance between the two different clinical groups. Besides the Fisher Grade, multiple logistic regression analyses showed that temporary clipping time, hypotension, and low $O_2$ saturation had odds ratios of 1.574, 3.016, and 1.528, respectively. Cerebral infarction and outcome had a meaningful correlation (${\gamma}$=0.147, p=0.038). Conclusion: This study results indicate that early surgery for poor grade SAH patients carries a significant risk of ongoing ischemic complication due to the brain's vulnerability or accompanying cardio-pulmonary dysfunction. Thus, these patients should be approached very cautiously to overcome any anticipated intraoperative threat by concerted efforts with neuro-anesthesiologist in point to point manner.
Chong, Jong-Yun,Yi, Hyeong-Joong,Kim, Kwang-Myung,Lee, Seung-Ro The Korean Neurosurgical Society 2007 Journal of Korean neurosurgical society Vol.41 No.5
Three-dimensional computed tomographic angiography [CTA], a representative noninvasive radiologic technique, is being widely used for detecting vascular lesions in specific intracranial bleeding under a certain circumstance [acute nontraumatic subarachnoid hemorrhage]. We encountered a case of extravasation of the contrast medium on CTA images that appeared as ribbon-like high-attenuation lesion from an aneurysm at the distal anterior choroidal artery in a young adult moyamoya patient. As CTA is used more frequently, it is imperative to understand such unusual but, potentially lethal image findings to conduct a prompt intervention.