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정정복(Jung Bok Jung),이원진(Won Gin Lee),김경찬(Kyung Chan Kim) 한국안광학회 1996 한국안광학회지 Vol.1 No.1
We studied the method which would determine the appropriate additive damping factor for the damped least sequres(DLS) optimization. We calculated eigenvalues of the product of the Jacobian matrix of error function by using the singular value decomposition(SVD) method. While suitable damping factor was appiled to the additive DLS by using SVD and Gaussian elimination method, the convergence and stability of the optimization process were examined in a triplet-type camera lens-system where the condition number is well conditioned. We compared the convergence and stability of merit function when median, maximum and minimum of eigenvalues were used as a damping factor in the optimization process. When dampine factor is median of eigenvalue, the convergence and stability of merit function are more excellent than in the case of two other eigenvalues. Thus, we adopt the median of eigenvalues as an appropriate damping factor. Next, by using SVD and Gaussian elimination method, we compound the convergence and stability of optimization process for triplet-type camera lens-system design. In these two method; triplet-type camera lens-system in which condition number is well conditioned, has little improvement with the combination of DLS and SVD.
Tranexamic Acid를 주성분으로 하는 경구약제의 기미치료 효과연구
신정원 ( Jung Won Shin ),허선영 ( Sun Young Huh ),정정복 ( Jeong Bok Jeong ),박경찬 ( Kyoung Chan Park ) 대한피부과학회 2011 대한피부과학회지 Vol.49 No.7
Background: Melasma causes considerable cosmetic disfigurement and none of the existing treatment modalities are satisfactory. Recently tranexamic acid has been reported to reduce hyperpigmentation in patients with melasma. Objective: The purpose of the study was to evaluate the efficacy and safety of tranexamic acid containing oral medication for the treatment of melasma. Methods: Forty-five female volunteers who had been diagnosed with melasma were enrolled in the present study. Patients were instructed to take medication for 8 weeks. The melanin index (MI) and erythema index (EI) were measured at baseline, and at 4 and 8 weeks. The melasma area and severity index (MASI) was scored at 0, 4, and 8 weeks. Self-satisfaction and safety evaluations were also performed at each visit. Results: The mean MI measured on the lesional skin was decreased at 4 and 8 weeks compared with baseline (p<0.01 for both). The mean EI measured on the lesional skin and the MASI also showed a significant decrease from baseline to 8 weeks (p<0.001 for EI and p=0.020 for MASI). Based on self-assessment, 39.5% of the patients were very satisfied, 44.2% were satisfied, and 11.6% felt moderate improvement after 8 weeks of medication; only 2 patients (4.7%) were dissatisfied. Thus, >80% of patients were satisfied with the medication. Adverse effects were minimal and two patients dropped out of the study due to drug-related urticaria and unexpected pregnancy. Conclusion: Tranexamic acid-containing oral medication is an effective and safe therapeutic modality for the treatment of melasma.
펄스형 방전플라스마에서 발생하는 가시광선의 분광 ( 2 )
최운상(Woon Sang Choi),정수자(Soo Ja Jung),김용훈(Yong Hun Kim),장준규(Jun Kyu Jang),정정복(Jung Bok Jung),신장철(Jang Cheol Shin) 한국안광학회 2000 한국안광학회지 Vol.5 No.2
We investigated visible light radiated from Plasma Focus device by time - integrated analyzed method. Plasma focus is a device that translated from electric energy into visible light by electric discharge. Spectral analysis is using Monochromator ( focal length = 0.5 m ) . Time - integrated spectrum is analyzed with densitometer the film which developed a constant range of wavelength. The condition of visible emission was that the discharging voltage was 13 kV and the working gas were Argon and Helium.
李原鎭,陸道鎭,鄭政福 대구산업정보대학 1996 논문집 Vol.10 No.2
We study various effect on worning the spectacle frame before the eye. A small cylinderical bundle of rays, when falling obliquely upon a spherical surface, the greater the obliquity of the incident ray, the great will be the astigmatism that is increasied. Also when vertex length is not constant, field angle and diopter is changed.