• Proceedings of the Korean Magnestics Society Conference
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• 2007.12a
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• pp.5-5
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• 2007

• The Science & Technology
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• no.3 s.454
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• pp.78-81
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• 2007

윤세왕 소장(부사장)은 서울대학교 기계공학과 졸업 후 UCLA에서 화학공학 석사 및 박사학위를 받았다. 지난 1997년 대한제당 중앙연구소 소장으로 부임하기 전까지 고집광형 태양광 업체인 AMONIX의 기술부사장을 거쳐 1994년 애리조나에 20kW 고집광 태양전지 발전소를 설치해 R&D상을 수상하기도한 윤소장을 지면을 통해 만나본다.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.31.1-31
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• 2001

Computer security is a very important issue these days. Computer viruses, worms, Trojan horses, and cracking are prevalent and causing serious damages. There are also many ways developed to defend against such attacks including cryptography and firewalls. However, it is not possible to guarantee complete security of computer systems or networks. Recently much attention has been directed to ways to detect intrusions and recover from damages. Although there have been a lot of research efforts to develop efficient intrusion detection systems, little has been done to facilitate the interaction between intrusion detection systems and users ...

• Clinics in Shoulder and Elbow
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• v.2 no.1
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• pp.1-7
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• 1999

Purpose : There has been considerable controversy as to the method of the treatment of acute acromioclavicular joint dislocation classified to type III injury. The purpose of this study is to compare the conservative and operative treatment of the type III acute acromioclavicular joint dislocation in terms of clinical and radiological results. Materials and Methods: We treated 31 cases of acute, type III acromioclavicular joint dislocation, 17 cases were treated by operative methods and 14 patients by conservative treatment, and 1 year minimum follow-up was done from January 1990 to January 1996. We used UCLA Shoulder Rating Scale for clinical results. And for the radiological results coracoclaviclar distance were measured. We used Fisher's exact test for statistical analysis of results between the two treatment methods. Results: Fifteen(88.2%) of seventeen patients in operative treatment and eleven(78.6%) of fourteen patients in nonoperative treatment were rated excellent or good on the UCLA rating scale. In radiographic evaluation, the average coracoclavicular distances of preoperative state, immediate postoperation(or postreduction) and last follow-up were as follows. In operative cases, it was 1.75±0.21mm, 1.14±0.24mm and 1.33± 0.22mm respectively. In nonoperative cases, it was 1.65±0.14mm, 1.26±0.26mm, and 1.42±0.27mm respectively. Conclusion : This study demonstrated that there was no significant difference in clinical and radiological results between the operative and nonoperative treatment groups. So, nonoperative treatment is recommended for acute type III acromioclavicular dislocation as general rule.

• Clinics in Shoulder and Elbow
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• v.17 no.3
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• pp.114-119
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• 2014

Background: To evaluate clinical and radiological outcome using AO hook locking plate in acute acromioclavicular joint injuries. Methods: This study was based on patients with Rockwood type 3 or 5 acromioclavicular joint injuries who received surgery with AO hook locking plate from June 2008 until June 2009. Among the 22 patients, 19 of them were male and 3 were female, the mean age was $44.4{\pm}15.57$ years (20-72 years) and follow-up period was $15.5{\pm}3.90$ months (12-23 months). Preoperatively, postoperatively, and at the final follow-up after the plate removal, both coracoclavicular distances were measured from the anteroposterior radiograph. Also, the Shoulder Rating Scale of the University of California at Los Angeles scores (UCLA scores), the American Shoulder and Elbow Surgeons scores (ASES scores), Constant scores, and the Korean Shoulder Society scores (KSS scores) were measured at the final followup to evaluate the function of the shoulder joint. Results: At the time of injury, the mean coracoclavicular distance of the injured side was $17.69{\pm}4.23mm$ (9.57-27.82 mm) and the unaffected side was $7.55{\pm}2.20mm$ (3.24-13.05 mm). The mean coracoclavicular distance measured postoperatively and at the final follow-up was $6.87{\pm}2.34mm$ (4.07-14.13 mm) and $8.47{\pm}2.96mm$ (4.37-17.48 mm), respectively. The mean UCLA, ASES, Constant, and KSS scores measured in the final follow-up were $33.5{\pm}1.30$ (31-35), $90.8{\pm}8.36$ (72-100), $78.6{\pm}8.80$ (62-100), and $94.4{\pm}5.08$ (84-100) each. Conclusions: From this short-term research, the surgical treatment using AO hook locking plates in acute acromioclavicular joint injuries is clinically and radiographically satisfying and considered as a useful treatment method.

• Clinics in Shoulder and Elbow
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• v.17 no.4
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• pp.159-165
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• 2014

Background: Kirschner's wire (K-wire) transfixation and locking hook plate fixation techniques are widely used in the treatment of acute acromioclavicular joint (ACJ) dislocation. The purpose of this study was to compare the clinical and radiologic outcomes between K-wires transfixation and a locking hook plate fixation technique. Methods: Seventy-seven patients with acute ACJ dislocation managed with K-wire (56 shoulders) and locking hook plate (21 shoulders) were enrolled for this study. The mean follow-up period was 61 months. Results: At the last follow-up, the shoulder rating scale of the University of California at Los Angeles (UCLA) was higher in patients treated with locking hook plate than with K-wires ($33.2{\pm}2.7$ vs. $31.3{\pm}3.4$, p=0.009). In radiologic assessments, coracoclavicular distance (CCD) (7.9 mm vs. 7.7 mm, p=0.269) and acromioclavicular distance (ACD) (3.0 mm vs. 1.9 mm, p=0.082) were not statistically different from contralateral unaffected shoulder in locking hook plate fixation group, but acromioclavicular interval (ACI) was significant difference. However, there were significant differences in ACI, CCD, and ACD in K-wire fixation group (p<0.001). Eleven complications (20%) occurred in K-wire transfixation group and 2 subacromial erosions on computed tomography scan occurred in locking hook plate fixation group. Conclusions: ACJ stabilization was achieved in acute ACJ dislocations treated with K-wires or locking hook plates. Locking hook plate can provide higher UCLA shoulder score than K-wire and maintain CCD, and ACD without ligament reconstruction. K-wire transfixation technique resulted in a higher complication rate than locking hook plate.

• Clinics in Shoulder and Elbow
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• v.7 no.1
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• pp.30-34
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• 2004

Purpose: To report our experience of treatment of rotator cuff tear and evaluate the mid-term outcome. Materials and Methods: We have performed 50 cases of mini-open rotator cuff repair from March 1996 to March 1999. Male to female ratio was 34：16, the average age 46.5(23∼57) years old, mean follow-up period was 78(62∼93) months. All-arthroscopic repair and open repair cases were excluded. Mean symptomatic period was 12.5(6∼38) months, operation was indicated in cases of no improvement by 6 months of conservative management. Preoperative simple radiographs and Magnetic resonance arthrography were obtained in all cases. We also observed the inflammation, synovitis, thickness of tear and associated pathology intraoperatively. We evaluated pain, function, and range of motion by UCLA score. Results: Overall UCLA score was mean 29.5 points. Excellent 25, good 18, poor 7 cases. Mean pain score was improved 2.6 to 7.5, 44 cases(88%) were improved and 6 cases(12%) were not improved. Mean functional score was improved 3.4 to 8.5, and activity at follow up, 25 cases(50%) were same, 8 cases(14%) were above, 17 cases(34%) were below compared with preoperative level. Mean active forward flexion was preoperative 112° to postoperative 160°, forward flexion strength was improved 3.8 to 4.7. 43 cases(86%) of patients were satisfied at the result, 7 cases(14%) were not satisfied or aggravated. Results: Mini-open rotator cuff repair was effective method in treating rotator cuff tear.

• Journal of the Korean School Mathematics Society
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• v.13 no.2
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• pp.243-262
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• 2010

CRESST(the National Center for Research on Evaluation, Standards, and Student Testing at UCLA) is now carrying out the research, which was scheduled for a five year period from 2007 to 2011. This research aimed at testing the effectiveness of the formative assessment program by continuously conducting the program on the target group and steadily applying the recurring feedback, in order to reform the teachers' teaching and to facilitate students' learning. To do this, CRESST has set out to develop the material for 7th graders since January 2007, and KICE(Korea Institute of Curriculum and Evaluation) have been running a collaborated research since July 2007, while sharing the instructional materials developed by CRESST. In 2008, the pre-test was conducted prior to this study in 2009. Especially, this paper deals with the Korean 7th graders' scholastic achievements in algebra domain measured by PowerSource(c). In addition, this study would examine the responses of teachers and students on its application.

• Clinics in Shoulder and Elbow
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• v.9 no.2
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• pp.155-161
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• 2006

Purpose: To compare the clinical and radiological results between the modified Weaver-Dunn method and modified Phemister method in the acute acromioclavicular joint dislocation. Materials and Methods: We reviewed 19 patients who were treated for the acute acromioclavicular joint dislocation from 2001 to 2002. 10 patients were operated with the modified Weaver-Dunn method (group A) and the others with modified Phemister method (group B). The classification of preoperative injury was analyzed by using the Rockwood system, the clinical assessment of preoperative and postoperative by the modified UCLA rating scale and the radiological assessment by simple x-ray. Results: With the modified UCLA rating scale, group A showed 5 cases(50%) of excellent and 5 cases(50%) of good, group B showed 4 cases(44.4%) of excellent and 5 cases(55.6%) of good. In the radiologic findings of the coracoclavicular distances, group A was 16.2 mm at preoperative, 8.8 mm at postoperative, 9.7 mm at last follow-up and group B was 12.9 mm, 6.7 mm and 7.9 mm respectively. Postoperatively there were no complications such as surgical wound infection and failure of Kirschner wires. Conclusion: Both the modified Weaver-Dunn and modified Phemister methods have shown satisfied clinical and radiologic results, and there was no difference in these result between two groups (p>0.05).

• Clinics in Shoulder and Elbow
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• v.19 no.4
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• pp.202-208
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• 2016

Background: Our study aimed to make a comparative analysis of clinical outcomes of arthroscopic decompression for rotator cuff calcific tendinitis by location of calcific deposits and by its size. Methods: We enrolled a total of 38 patients, comprising 39 affected shoulders, who underwent arthroscopic decompression for calcific tendinitis. As our clinical scores, we evaluated the UCLA, the ASES, and the VAS scores and analyzed them by calcific location, by calcific deposit size, by the presence or absence of calcific remnants, and by whether concomitant cuff repair was performed. Results: The clinical scores of those whose calcific deposit had an area greater than $77.0mm^2$ and of those whose calcific deposit had an area smaller than $77.0mm^2$ did not significantly differ (p=0.21 in ASES; p=0.19 in UCLA; p=0.17 in VAS). Nor did the clinical scores significantly differ with respect to the location of calcification (p=0.23). Further, the clinical scores did not significantly differ between those who had calcific remnants and those who did not and between those who received additional cuff repair and those who did not. Conclusions: We found that the clinical outcomes after arthroscopic decompression of calcific tendinitis were not significantly associated with the cuff tendon in which the calcium deposits are found; the location of the calcium deposits in the supraspinatus tendon (if found in this tendon); the size of calcific deposits; the presence of calcific remnants; and concomitant cuff repairs.