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전영화,홍란선,강영진,강성주,Jeon, Yeong-Hwa,Hong, Lan-Sun,Kang, Young-Jin,Kang, Seong-Joo 대한화학회 2004 대한화학회지 Vol.48 No.2
이 연구에서는 산-염기 중화반응의 실험 방법에 관련된 과학 교과서 내용을 분석하고, 문제점을 개선하는데 목적이 있다. NaOH-HCl 수용액의 중화반응실험에서 1) 페놀프탈레인의 decoloration, 2) 염 생성 확인을 위해 적정된 용액의 농축을 위한 가열 과정에서의 색 변화, 3) 염 결정 확인의 어려움이 문제점으로 지적되었다. 이러한 문제점들은 페놀프탈레인의 구조변화에 근거하여 설명하였고, 개선된 실험방법을 제시하였다. The aim of this study is to analyze and improve the experiment of the acid-base neutralization reaction described in science textbooks. The problems in the neutralization reaction of NaOH-HCl solution were following; 1) the decoloration of phenolphthalein solution, 2) the color change of the titrated solution during condensation for the confirmation of the salt crystals, 3) the difficulty for the confirmation of the salt crystals. These problems are explained by the structure change of phenolphthalein and the improved experiment is proposed.
옥종한(Jong Han Ok),강영진(Young Jin Kang),김태진(Tae Jin Kim),이성미(Seong Mi Lee),엄재화(Jae Hwa Eom),정재성(Jae Seong Jeong),정영기(Yeong Ki Jeong) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.1
N/A Carcinoma of the stomach is one of the most prevaleni maliganancies in Korea and the prognosis is usually poor. However, the prognosis for the early gastric cancer (EGC) has been reported excellent and this is why emphasis is put on the early diagnosis and treatment of this grave problem. This study analyzes the incidence, morphological clas.ification, location of the lesion, size of the lesion, depth of invasion, lymph node metastasis, diagnotic accuracy of double contrast X-ray and endoscopy. histopathologic claesification and clinical sym,ptoms of 45 cases of EGC operated on from 1983 to 1990 at Maryknoll Hospital. The incidence of EGC was 5. 6% of all stomach cancer diagnosed during the same period and 11.1% to the resected cases. Out of 45 cases of early gastric cancer, 29 cases were male, 16 cases female, the ratio of male to female was 1.8: 1, and the mean age was 52.6 years old. The most common types of early gastric cancer were IIc type (26.7%), and its combined type (37.3%). The common sites were antrum (53.3%) and lesser curvature (33.3%). 25 cases (55. 5%) were between 1-2 cm in size and less than 3 cm was found in 41 cases (91.1%). Of the 9 cases with mucosal lesion, none had lymph node metastasis. But, 5 (13.9%) out of 36 cases with submucosal invasion showed lymph node metastasia The depth of invasion was related to the incidence of lymph node metastasis (P,0.05). But the size of the losion was not related. The diagnostic accuracy of EGC for endoscopy was 66.7%, and for double contrast X-ray it was 35.6%. The most common type of EGC was tubular type of adenocarcinoma. Common complaints were epigastric discomfort and pain (62. 2%), weight loss (17. 8%), and epigas' tric fullness(8. 9%). And the duration of symptoms lasted within 1 year (77.8%).