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이진 영상을 위한 Compact Complementary Quadtree 의 구성
조영우(Cho Young Woo),김영모(Kim Young Mo) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.1
In this paper, we propose a new preorder tree traversal method for binary images, named the Compact Complementary Quadtree (CCQ). In the proposed method we use type codes for representing nodes in the quadtree instead of using the symbols G, B, and W. From the experimental results, we have confirmed that the CCQ has a higher compressing ratio than of the DF-expression. CCQ can be effectively applied to progressive transmission of binary images such as line drawings, geographical maps, and halftones.
조영우(Young-Woo Cho),김정란(Jeong-Lan Kim),김수영(Soo-Young Kim),왕성근(Seong-Keun Wang),지익성(Ik-Seung Chee) 대한생물치료정신의학회 2009 생물치료정신의학 Vol.15 No.2
Objectives: The purpose of this study was to standardize the Korean version of the Reaction Inventory(K-RI) for measuring an individual's propensity for anger arousal. Methods: After translating the Reaction Inventory into the K-RI, the K-RI, Korean version of the Aggression Questionnaire(K-AQ), and Korean version of the Depression Anxiety Stress Scale-21(K-DASS-21) were administered to 424 Korean medical college students. The re-test was conducted with a 2-week interval of 119 students. Results: 1) The internal consistency of K-RI was 0.96(Cronbach's α, p<0.01). The test-retest reliability of K-RI was 0.68(Pearson's correlation coefficiency, p<0.01). Convergent validity was examined by Pearson's correlation coefficient between K-RI and K-AQ, which was 0.48 (p<0.001). 2) Four factors from K-RI were extracted by factor analysis with Varimax Rotation. The factors of K-RI were "Unpredictable disruptions and disturbances factor", "Embarrassing circumstances factor", "Personal disrespect factor", and "Unpleasant encounters factor". Conclusion: These results indicate that the Korean version of Reaction Inventory is a reliable and valid instrument to assess anger reaction.
0.2% Ropivacaine을 이용한 성상신경절차단의 효과
조영우(Young Woo Cho),송선욱(Sun Ok Song),장주현(Ju Hyen Jang) 대한통증학회 2000 The Korean Journal of Pain Vol.13 No.2
N/A Background: Ropivacaine is a new amide local anesthetics, having therapeutic properties similar to those of bupivacaine but less cardiovascular toxicity and motor blockade. The aim of this study was to evaluate the effects of ropivacaine used in stellate ganglion block (SGB) compared with those of lidocaine or bupivacaine. Methods: This prospective and crossover study performed in twenty patients with sudden sensory neural hearing loss. All patients received three times SGB, in the paratracheal approach using 8 ml of 1% lidocaine, 0.2% bupivacaine, and 0.2% ropivacaine respectively without any orders. Onset time and action duration of Horner's syndrome were observed after each SGB. Results: Onset time of ropivacaine was the middle of the three agents; earlier lidocaine and slower bupivacaine. Lidocaine (3.0±1.9 min), bupivacaine (4.1±2.9 min) and ropivacaine (3.3±1.3 min). But there were no significant differences; Action duration of Horner's syndrome of ropivacaine (223.6±105.2 min) was longer than lidocaine (134.6±77.3 min) and shorter than bupivacaine (241.2±115.8 min). There were significant differences in the action duration of each local anesthetics (P<0.05). There was no critical side effects and temporary foreign body sensation was the most common side effect. Conclusions: We conclude that ropivacaine is a good alternative in SGB instead of lidocaine or bupivacaine. Ropivacaine is a long acting local anesthetic similar to those of bupivacaine with wide margin of safety. However, optimal concentration and volume of ropivacaine in SGB should be studied.
팔레트를 가지는 칼라 영상의 점진적 전송을 위한 새로운 피라미드 자료 구조
조영우(Cho Young Woo),김영모(Kim Young Mo) 한국정보처리학회 1996 정보처리학회논문지 Vol.3 No.6
Palettized color images are the dominant type of the image used in Internet and World-Wide Web. In spite of this, most image compression and progressive transmission algorithm have been designed of continuous-tone images in such a aspect that pixel values are lookup table indices instead of physical intensity values. Hence palettized images have lower spatial correlation. In this papre, we propose a new pyramid structure for compression and progressive transmission of a palettized image. In the proposed pyramid structure, the color of a node at higher level is the one that occupies the most part in 4 sons and each node is represented by a type code and several color codes. Since the proposed method do not exploit spatial correlation in an image, it is ideally applied to lossless compression and progressive transmission of palettized images. We have confirmed this through the experimental results.
돌발성난청에서 성상신경절 차단 직후 순음청력치는 즉각적으로 변화되는가?
조영우(Young Woo Cho),송선욱(Sun Ok Song),권성현(Sung Hyun Kweon) 대한통증학회 2000 The Korean Journal of Pain Vol.13 No.2
N/A Background: Vascular occlusive event is one of the etiologies of sudden sensorineural hearing loss (SNHL). Stellate ganglion block (SGB) induces dramatic and intense vasodilatation in head and neck Based on this principle, SGB has used as one of the treatment modalities in SNHL. This study was performed to evaluate immediate response of SGB on pure tone audiogram (PTA) in SNHL. Methods: Forty patients were studied. Each patient received daily ipsilateral SGB in paratracheal approach using 0.2% bupivacaine for 2 weeks. On first, third, and fifth day of treatment, we checked their PTA twice 1 hour before (Pre-PTA) and after (Post-PTA) SGB. Pre- and Post-PTA were compared. Several factors were analyzed as a prognostic factor of therapeutic results. Results: Eleven of 40 patients revealed decreased PTA after SGB. Degree of decreased PTA were insignificant (2.5±1.6dB). Initial and final PTA results was 76.2±22.5 and 49.8±28.3dB, respectively. Thirty-one of 40 patients were improved their PTA over 10 dB. The recovery was mainly influenced by the severity of initial hearing loss (P<0.001) and slightly by age (P<0.05). However, the change of PTA after SGB, time interval to receive SGB, sex, site, and number of SGB were not correlated to therapeutic outcome. Conclusions: These results suggest that vasodilatation by SGB has no immediate improvement in SNHL. Therefore, we question whether SGB is beneficial to all patients with SNHL as a therapeutic modality.