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2기 전력계통의 동적 안정도 해석을 위한 단순화된 모델
장성환,안태천,이중빈 원광대학교 공업기술개발연구소 1981 工業技術開發硏究誌 Vol.1 No.-
Dynamic stability analysis of a large interconnected power system may even exceed the storage capacity of modern fast computers because of the high order of the matrix. In this paper two methods hav teen introduced to obtain simplified models of the systems bared on the magnitude of the variables or the eigenvalves. The difference between the eigenvalves of the reduced models and that of the original models was within 0.53% and the difference of the rerponse during the transient time in negligible. This method can be used to calculate the eigenvalues and analyze the dynamic stability of systems of high order matrix.
유선염(乳腺炎) 의 한방(韓方) 외치법(外治法)에 대한 문헌적고찰(文獻的考察)
장성환,Chang, Sung-Hwan 대한한방피부미용학회 2005 대한한방피부미용학회지 Vol.1 No.1
Acute Mastitis(急性乳腺炎=乳癰) is an acute suppurative disease appearing in the breast. It is mostly caused by galactostasis, the stagnation of liver-qi(肝鬱) and stomach-heat(胃熱). It is mostly found in breast feeding women, mostly in primiparae. It usually appears in the third and the fourth weeks of postpartum. At the beginning in the chest there appear induration, distending pain, galactostasis, inversion to cold with fever followed by the enlargement of the masses, burning red, megalgia, not subduing of chills and fever, the accumulation of it to form pus. In the early phase it is advisable to follow the therapeutic principles of soothing the liver and clearing away heat, promoting lactation and subduing swelling. After the formation of pus it is advisable to cut radially and drain the pus. External Therapy(外治法) generally refers to all the methods to treat various diseases and symptoms with application of drugs and manipulation or together with proper instruments on the body surface except the method of taking medicine orally Acute Mastitis has been regarded as surgery or the method of taking medicine orally But, based on many bibliographies, acute mastitis was treated by external therapy. Thus through the historical bibliographic studies of external therapy about acute mastitis, this study was made to help the expanding of the methods of treating acute mastitis.
장성환,이정학 한국청각언어재활학회 2016 Audiology and Speech Research Vol.12 No.2
Purpose: The purpose of this study was to develop a list of sentences for auditory training, especially speech tracking for hearing impaired adults. Methods: A total of 1,000 sentences which were collected from five popular novels, were recorded on a compact disk. Seventy-five hundred basic sentences were selected based on the validity test and 750 noise sentences were made by synthesizing basic sentences with 4-talker babble noise. Participants were 20 young and 20 elder people who spoke Korean as their first language. Results: Results showed that all 750 basic sentences scored greater than 90% of correct response rate. However, 138 noise sentences scored lower than 90% of correct response rate. In 750 noise sentences, there were significant differences in correct response rate with respect to the number of words in each sentence, age, and speaker. Conclusion: These results recommend that newly developed 750 basic sentences are appropriate in speech tracking for adult auditory training. For noise sentences, however, 618 sentences are recommended for speech tracking.