• The Journal of Engineering Geology
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• v.32 no.4
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• pp.725-733
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• 2022

This study applied a hydraulic rock splitting system equipped with a hybrid packer to the bench-cut method. The hybrid packer system is an improvement of the packer developed in previous studies; it is designed efficiently to reduce vibration and noise during rock excavation by combining the two functions of inducing hydraulic fractures using injection pressure and then expanding and extending them using a rubber packer. Field experiments assessed the efficiency of rock excavation with respect to the injection conditions; the adjusted experimental conditions included the distance from the free surface and the test holes drilled at the top of the slope and the injection settings. Using a separation of 5 m left some unexcavated parts, but using a separation of 1 m left no unexcavated parts. The hydraulic fractures generated by the injection pressure developed generally parallel to the free surface and expanded and extended as the rubber packer expanded, thus facilitating bench-cut excavation. For hydraulic rock splitting to be broadly applicable to bench-cut rock excavation, it is important to accumulate results from many field experiments conducted under varying experimental conditions for various types of rockmass.

• Journal of Chest Surgery
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• v.35 no.9
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• pp.675-679
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• 2002

In patient with severe adhesion between lung and aorta, there is some limitation in approaching the distal arch or descending thoracic aorta through the usual left thoracotomy. We report a case of a successfully managed distal arch and descending thoracic aortic aneurysm through the median sternotomy without any manipulations of the lung in a 66 year old man who presented hemoptysis.

• Proceedings of the Korean Geotechical Society Conference
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• 2000.11b
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• pp.79-88
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• 2000

국내의 지질 및 지형적 특성으로 인하여 도로 개설에 따른 절개 사면이 증가하고 있는 추세이다. 하지만 이런 절개 사면에 대한 체계적이고 효율적인 자료를 갖추고 있지 못하는 실정이다. 특히, 강원도는 산악지형이 많고 영동지방과 중부지방을 연결하는 도로에 대규모 절개사면들이 자리잡고 있어 매년 크고 작은 사면활동이 발생되어지고 있다. 하지만 아직까지 강원도 산악지형에서 발생한 사면파괴에 대한 적절한 평가와 대책이 이루어지지 못하고 있다. 따라서, 본 논문에서는 강원도 지방도 사면의 관리현황과 유지관리방법 그리고 대책수립현황에 대해 소개하고, 조사된 자료로부터 산악지형 지방도 사면의 특징을 파악하여 나아가서는 적절한 사면안정대책 수립을 위한 방안을 제시하는 데 있다.

• Journal of Chest Surgery
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• v.31 no.4
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• pp.432-435
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• 1998

Idiopathic cricopharyngeal achalasia is a rare condition that produces oropharyngeal dysphagia. It is caused by spasm of the cricopharyngeus and inability to relax with swallowing. A prominent muscle bar at the upper esophageal sphincter is a typical finding of the esophagogram. Cricopharyngeal myotomy is the treatment of choice. We report a case of cricopharyngeal myotomy for 61-year-old female patient.

• Journal of Korean Orthopaedic Sports Medicine
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• v.9 no.1
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• pp.35-40
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• 2010

Purpose: To compare the outcome of patients who underwent rotator cuff repair using all-arthroscopic mini-open repair techniques. Materials and Methods: We retrospectively reviewed 44 patients who underwent either arthroscopic (group I) or mini-open (group II) rotator cuff repair. 23 patients underwent an arthroscopic repair and 21 patients had a mini-open repair. The mean age was 50.4 years in the arthroscopic group and 56.7 years in the mini-open group. The outcomes for the 2 groups were evaluated using ROM, VAS, ASES, UCLA scale. Statistical analysis was performed using correlations, T-test, Paired T-test. The mean follow-up period in the arthroscopic and mini-open groups were 24.1months and 26.1months, respectively. Results: The group I (arthroscopic group) had 2 small-sized tears, 10 medium sized tears, and 11 large sized tears (3~5 cm). The group II (mini-open group) had 1 small sized tears, 8 medium sized tears, and 12 large sized tears. The mean cuff tear size of the group I and Group II were 3.8 cm and 4.2 cm, respectively. At last follow-up periods, ROM and functional scores were improved. In the group I and group II, there were no significant difference in ROM, VAS, ASES, UCLA score. Conclusion: The size of the tear did not produce different results at arthroscopic repair group but larger tear size was associated with a worse outcome in mini-open group. There were no significant clinical results between the arthroscopic and mini-open group.

• Journal of Chest Surgery
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• v.31 no.11
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• pp.1037-1042
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• 1998

Background: Among the various techniques for the adequate exposure of the mitral valve, the extended transseptal approach is the essential prerequisite for accurate repair or replacement of the mitral apparatus. But the efficacy and safty of the extended transseptal approach has not determined in Korea yet. Materials and methods: Retrospective data of 80 consecutive patients, operated from September 1992 to July 1997 were reviewed. Seventy- eight patients underwent mitral valve replacement and 2 patients underwent excision of left atrial myxoma. Thirty-eight of 78 patients had other concomitant procedures such as aortic valve replacement(n=22), tricuspid annulopasty(n=14), coronary artery bypass graft(n=1) and closure of ventricular septal defect(n=1). Mean follow up was 23.3±15.0 months and total follow up was 1792 patient-months. Results: The hospital mortality rate was 3.8%(3 patients). Two deaths were due to low cardiac output and one due to postoperative bleeding of coagulopathy. Among the 46 patients who had atrial fibrillation preoperatively, 45 had atrial fibrillation postoperatively and 1 converted to sinus rhythm. All 34 patients who were in normal sinus rhythm preoperatively remained in sinus rhythm after the operation. Mean aortic cross clamping time was 62 minutes for isolated mitral procedure and 90 minutes for concomitant procedures. There were no specific complications related to this approach. Conclusions: We suggest that the extended transseptal approach is an easy and good method for mitral valve surgery, especially in patients with small sized left atrium.

• Journal of Korean Society of Forest Science
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• v.86 no.4
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• pp.476-488
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• 1997

The purpose of this study was to figure out the suitable field standards for revegetation measures on cut-slopes in consideration of the environmental factors. The field survey was conducted from 1995 to 1996 on highway cut-slopes. The results obtained could be summarized as follows; The major revegetation measures surveyed were 5 major measures as a whole in descending order of seed-spraying measures, block-sod pitching measures, latticed block pitching measures, hydro-seeding measures with seed-fertilizer-soil materials, and several netting measures on highway cut-slopes. According to the analysis of the environmental factors, the plant coverage was affected several major environmental factors which were soil factors(soil hardness, soil texture, soil and rock condition), and site factors(slope gradient, slope length). From a viewpoint of optimum selection, the major 3 factors(soil factors, slope gradient factors, slope length factors) should be considered for selection of revegetation measures on highway cut-slopes.

• Journal of Digital Convergence
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• v.17 no.7
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• pp.265-274
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• 2019

The purpose of this study was to know the difference in pain, sleep, self-care behavior in patients performed by sternotomy and robotic minimally invasive cardiac surgeries. The participants were 64 patients with sternotomy and 64 patients with minimal thoracotomy in heart valve surgeries at a tertiary hospital in Seoul. Data were analyzed using descriptive statistics, ${\chi}^2$ test, paired t-test. with SPSS/WIN(22.0). The participants with minimally invasive thoracotomy felt severe pain than the patients with thoracotomy at post operation day 2 & 5. The severe pain site were the surgical site in both groups. The participants with sternotomy had better sleep than minimally invasive thoracotomy patients. Self-care behavior was higher in the minimally invasive thoracotomy group. Therefore, despite the many advantages of robotic surgery such as rapid recovery and shortening of length of stay in hospital, accurate pain assessment and application of differentiated protocols are needed for the management of pain in the patients with robotic minimally invasive cardiac surgeries. In addition, a structured education program intervention is needed to improve comfort by considering gender, age, and method of operation.

• Proceedings of the KSLP Conference
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• 1993.12a
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• pp.9-9
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• 1993

후두 형태에 이상이 없는 잡종개 2마리를 정맥 마취한 상태에서 생체 발성 모형을 만들었다. 경부 피부를 수직절개하고 후두 및 기관을 노출시킨 후, 기관에 상, 하 두 개의 기관절개를 가하고 두개의 삽관튜브를 삽입하였다. 아래 튜브로는 호흡을 유지하게 하였고, 위의 튜브로는 공기를 후두 방향으로 보내면서, 상후두신경의 외지와 반회신경 및 반회신경의 최종 분지인 갑상피열 분지에 전극을 각각 부착하여 일정한 정도의 전기자극을 가함으로써 소리가 유발되도록 하였다.(중략)

• Journal of the Korean Geographical Society
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• v.33 no.spc
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• pp.739-744
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• 1998

1950년대 이후 일본의 많은 도시지역에서는 구릉지를 중심으로 한 택지개발이 활발히 이루어져왔고, 그 결과 이 지역의 지형은 절개와 매립에 의해서 많은 변화를 겪게 되었다. 그런데, 1978년, 1993년, 1995년 등에 발생한 지진에 의해 이러한 택지에 건설된 주택의 상당한 수가 피해를 입었다. 지진의 피해를 특히 많이 받은 주택들의 대부분은 절개지와 매립지 사이에 위치한 것들이었다. 이를 통해 지형 및 그 변형에 관련된 토지의 상태와 지진에 의한 주택의 피해정도 사이에는 상관관계가 성립한다는 것이 입증되었다. 심포지움에서, 연구자는 GIS를 이용한 분석법을 활용하여 일련의 사례 연구들을 제시할 것이다.