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비극성 탄화수소계에 대한 Wilson Parameter 의 계산
하만호,배효광 한국화학공학회 1987 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.25 No.2
Wilson 식은 다성분계의 기액평형계산에 2성분계의 data로부터 용이하게 확장이 되기 때문에 광범위하게 이용된다. 그러나 열역학적인 비선형모델이므로 Parameter를 계산하기 어렵다. 본 연구에서는 Maximum Likelihood의 원리를 기초로 한 Anderson의 방법을 이용하여 비극성 탄화수소계의 Wilson parameter를 계산하고 두 parameter 사이에는 밀접한 상관관계(상관계수가 0.99∼1.0)가 존재함을 알 수 있었다. 두 parameter의 관계를 plot한 결과 거의 직선으로 표현되며 그 직선의 기울기는 구성성분의 액상몰용적의 비(V^L₂/V^L₁)와 거의 동일하였다. 따라서 다른 성분 사이의 상호작용에너지(λ_(12))는 동일성분 사이의 상호작용에너지 (λ_(11), λ_(22))와 V^L₂/V^L₁ 으로 표현되며 이때 직선의 절편만 알면 λ_(12)를 계산할 수 있다. 다시말하면, Single Parameter의 Wilson 식에서 Unlike-Pair Potential Parameter에 대한 새로운 추산식을 제안하였다. 제안한 식으로 계산한 결과와 P, y Regression에 의해 계산된 실측치와의 편차를 비교하여 제안된 Single-Parameter Wilson 식이 기액평형계산에 충분히 이용가능함을 알 수 있었다. The Wilson parameters of 53 binary hydrocarbon systems are obtained from the vapor-liquid equilibrium data of the systems with regression analysis method proposed by Anderson et al. that is based on the principle of maximum likelihood. The correlation coefficients between two parameters are close to unity and the relationships between them are represented as nearly straight lines. We find out that the slopes of the relationships can be substituted with the ratios of liquid molar volume of the constituents. In case liquid molar volume and like-pair intermolecular energy (λ_(ii)) in Wilson parameter can be calculated, we can evaluate the unlike-pair intermolecular energy (λ_(ii)) if intercept of the linear relationship between two parameters is known. Therefore, a single-parameter Wilson equation is proposed by the present work. The pressure (P) and mole fraction in varpor(y) calculated by this model are in good agreement with the observed, and deviation of them are plotted in figures to show the agreement between them.
ALR변경에 따른 2상 내부 혼합형 노즐의 미립화 성능에 관한 연구
하만호(M. H. Ha),김규철(K. C. Kim),김남훈(N. H. Kim),남궁정환(J. H. NamKung),이삼구(S. G. Lee),노병준(B. J. Rho) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
The Atomization Characteristics of two-phase internal mixing nozzle was investigated using 2-D PDPA system. To obtain the information of the nozzle, the mean velocities were measured at Z=10, 20, 50, 80, 120, 170㎜ from the nozzle exit. Moreover, SMD was along calculated at the same distance from the nozzle tip in order to describe the atomization characteristics according to the change of ALR. The ALR used in this experiment was changed from 0.1256 to 0.3238 and the mass rate of the liquid(water) was kept at 1.8g/s.
하만호(ManHo Ha),문홍주(HongJu Moon),이종길(JongKil Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
The Truck suspension is one of the most important part to decide the durability performance of the commercial vehicle. Since the shackle & helper stopper, a core component for rigid axle supension, directly supports leaf spring, it needs strength and durability. In this paper, the test objective developed the 5 ton truck, Z directional durability test was carried out shackle & helper stopper. The durability test has been conducted under a driving condition of Z force mode by usieng hydraulic actuator for shackle & helper stopper. We"ve also carried out srtuctural analysis by utilizing ANSYS in order to predict for shackle & helper stopper durability.
하만호(ManHo Ha),이종길(JongKil Lee),임경채(KyungChae Lim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The Truck suspension is one of the most important part to decide the durability performance of the commercial vehicle. Since the spring Hanger, a core component for rigid axle supension, directly supports leaf spring, it needs strength and durability. In this paper, X/Y/Z directional durability test was carried out and test objective was the 5 ton truck. The durability test has been conducted under a driving condition of X/Y/Z force mode by usieng hydraulic actuator for spring hanger for commercial vehicle. We"ve also carried out srtuctural analysis by utilizing ANSYSin order to predict for spring hanger durability.
중심 침 생검에서 발견된 유방의 유두상 병변의 악성 예측 인자에 관한 연구
배정원,하만호,이정아,이승근,손길수,이은숙 한국유방암학회 2010 Journal of breast cancer Vol.13 No.4
Purpose: Diagnosing benign or malignant papillary lesions of the breast through core needle biopsy (CNB) is often difficult. The purpose of this study was to identify the predictive factors of malignancy. Methods: We retrospectively reviewed the pathology database and found 80 consecutive patients who had been diagnosed with breast papillary lesions prior to surgery at two medical centers from May 2004 through May 2009. Those patients who had undergone CNB and had been diagnosed with either intraductal papilloma or malignant lesions following surgical excision were included. Results: Forty-five cases were diagnosed as intraductal papilloma and 24 cases as malignant lesions. Malignancy was found to be related to being older than 60 years (p<0.01), having bloody nipple discharge (p=0.05),and a tumor size of more than 1 cm (p<0.01). Further, irregular shape (p<0.01) and uncircumscribed margin (p<0.01) on mammogram and irregular shape (p=0.04), calcification (p<0.01), and isoechoic pattern (p<0.01) on ultrasonogram were significantly related to malignancy. Conclusion: Our study revealed that particular clinical factors and imaging findings correlated with malignant lesions. However, larger prospective studies are still necessary to establish treatment plans for patients diagnosed with papillary lesions on CNB.
Gastric Duplication Cysts in Adults: A Report of Three Cases
김수미,하만호,서정은,김지은,민병훈,최민규,이준행,김균미,최동일,손태성,배재문,김재준,김성,이준호 대한위암학회 2015 Journal of gastric cancer Vol.15 No.1
Gastric duplication cyst is a rare congenital anomaly of the gastrointestinal tract and is especially uncommon in adults. Most cases in adults are discovered incidentally on radiological examination or gastric endoscopy. Accurate diagnosis of these cysts before resection is difficult. Differential diagnoses are varied. Malignant transformation of a gastric duplication cyst is very rare. We present three cases of asymptomatic noncommunicating gastric duplication cysts in adults.