• Explosives and Blasting
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• v.18 no.4
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• pp.43-54
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• 2000

본 연구에서는 계단식 발파에서 파쇄입도에 영향을 미치는 변수들로부터 대괴를 줄이는 새로운 발파패턴을 제시하고자 하였다. 광주 제2순환도로 대절토 구간에서 천공경, 1회발파공수, 화약의 종류 등의 영향을 파쇄암의 평균입자의 크기와 상위 5개의 대괴 평균치로 나타내었다. 그 결과 대괴의 크기는 평균 파쇄암의 크기와 선형적인 추이를 나타내었으며 평균파쇄도는 저폭속 폭약인ANFO가 NewMITE 보다 좋은 결과를 보였다. 또 천공경 65 mm와 75 mm로 ANFO즉 사용했을 때 파쇄도는 약포의 직경이 작은 경우에 파쇄도가 양호하게 나타났고 총공수와 파쇄도를 살펴본 결과 평균파쇄도와 대괴의 크기는 대제적으로 총공수의 증가에 비례하여 커지는 경향이었으며 평균파쇄도 보다는 대괴의 크기가 증가의 폭이 컸다. 한편 첫째 열을 2단 분리장약했을 때가 일반 발파나 1열 소단벤치발파 때보다 파쇄도가 좋았다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.328-330
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• 2016

내시경을 이용한 진단 및 시술은 빈번하게 이루어지고 있으며, 대장암의 증가와 정부의 암 조기검진사업의 영향으로 시행건수가 많아지면서 천공 및 출혈 등의 의료사고도 늘어나고 있다. 내시경 장비를 이용한 시술은 시술자의 경험이나 감각, 숙련도에 의존하여 시행된다. 내시경 시술시 내시경 선단부의 수평 및 수직, 압력에 대한 실시간 정보를 제공하면 의료사고를 줄일 수 있다. 본 논문에서는 가속도와 자이로센서를 융합하여 각도 및 자세정보를 얻고 압력센서를 이용하여 선단부가 받는 압력을 시술자에게 제공하여 내시경 시술시 천공 및 출혈 등의 의료사고를 줄일 수 있는 방안을 제시한다.

• Explosives and Blasting
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• v.21 no.1
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• pp.19-27
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• 2003

국내 석회석 광산에서는 벤치 발파패턴을 현장의 KNOW-HOW에 따라 가장 경제저인 발파패턴을 적용하고 있다. 그러나 인건비 재료비등 제반경비가 상승함에 따라 좀 더 효율적인 발파방법의 개선이 요구되고 있는 바, 현 석회석 광산에서의 발파패턴을 보다 개선하여 경제적인 발파패턴을 적용하고, 그에 따른 고려해야 할 사항들을 본 논문에서 연구 하고자 한다. 따라서 국내 석회석 광산의 발파 패턴과 외국의 광산발파 패턴을 비교하고, 수치해석을 적용하여 기존의 발파 패턴에서 장약길이, 공간격, 장약량의 변화, 천공경은 102mm에서 115mm로 변화하고 장양방법을 단일장약에서 이중장약으로 변화하여 동해 쌍용자원에서 시험을 실시하였다. 연구 결과 장약길이의 20% 감소는 Power Factor를 (20%)낮게 하나, 파쇄효과는 28% 감소하고 Back Break가 (7%)이상 발생하였으며, 천공경을 115mm로 적용하고, 장약길이를 11% 감소를 위하여 이중장약을 적용하여 Power Factor를 10% 낮게 하였을 때 파쇄효과는 22.45%가 증대되었으며, 기존 동일 패턴에 Booster를 추가로 적용하였을 때 파쇄효과는 13.21% 가 증대되었고, Power Factor는 11% 가 감소되는 것을 알 수 있었다.

• Journal of Korean Society of Steel Construction
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• v.26 no.6
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• pp.617-626
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• 2014

In this paper, experiments for the evaluation of tensile strength of steel plate with bolt hole and bearing strength of bolted connection were performed, where bolt holes were punched by drilling and oxygen torch, respectively. For the tensile tests, drilled and oxygen torch punched steel plate specimens of 10mm and 15mm thickness were made from structural angles and H-shapes, respectively. For the bearing strength evaluation, test specimens were fabricated with base plates and splice plates those were also punched by drilling and oxygen torch, respectively. The Vicker's hardness were measured around the bolt hole to investigate material property change due to heat effect by oxygen torch cut. Numerical analysis was also performed to investigate the bearing strength of bolted joints due to the increase of hardness around the bolt hole by oxygen torch cut.

• Proceedings of the Korean Geotechical Society Conference
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• 1998.06a
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• pp.197-207
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• 1998

• Journal of Veterinary Clinics
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• v.29 no.6
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• pp.506-508
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• 2012

A 5-year-old, intact female, Pomeranian was presented with a persistent vomiting for 5 days after swallowing a chicken bone. The dog was diagnosed with an esophageal foreign body, and a small perforation was found after the endoscopic removal of the chicken bone. The dog was determined to be treated with a non-operative management, and a complete closure of the perforation was confirmed by a flexible endoscopy 3 weeks after removal of a chicken bone. This paper reports the case of esophageal perforation caused by foreign body in esophagus managed with the non-operative therapy instead of surgical correction.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1976.06a
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• pp.90.3-90
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• 1976

The authors experienced an unusual case of esophageal foreign body with esophageal perforation. A 8-month-old boy swallowed a long (about 20 cm) thick (about 3mm in diameter) wire, which had a hooked end and the another straight. The hooked end was located at near the first esophageal narrowing with swelling on the left lateral neck and the another end was out of his mouth. As failure of complete removal of the foreign body with esophagoscopy, the hooked end was cut and removed with the lateral incision of the neck and the remainder was removed was removed with esophagoscopy. After removal of the foreign body, nothing was given by mouth and the patient feed through nasogastric tube for about 4 weeks and the perforated esophagus was healed completely without any other complication.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.4
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• pp.836-845
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• 2017

Due to the development of endoscopic technology, endoscopic diagnosis and procedures have been actively performed. However, due to the increase in colorectal cancer and the effect of government's early cancer screening project, the number of endoscopic diagnosis and procedures has increased, thus medical accidents such as perforation and bleeding are increasing. Therefore, efforts to reduce such medical accidents are needed. In this paper, we propose a method to provide the direction information of the endoscope and the force applied to the probe in real time. We also propose and evaluate an interpolated complementary filter considering the very slow movement of the endoscope probe. The proposed interpolated complementary filter showed 34.6% and 27.6% performance improvement. The expected user interface for applying the proposed method to the endoscopic system is also presented. This shows that the proposed method is applicable to endoscopy system.

• Journal of Mushroom
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• v.10 no.2
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• pp.68-73
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• 2012

The plastic culture bottle cap types and accumulated concentration of carbon dioxide, media humidity in the process of medium culture and yield were observed in Pleurotus ostreatus 1,100ml bottle in Iksan, Jeollabuk-do, Korea, during 2011. The concentration of carbon dioxide in the process of medium culture was the highest after 6~11days cultivation irrespective of cap sizes and types. The upper-under 19~38mm perforation hole and under 26~47mm perforation hole of caps in the 1,100ml bottle were best condition for cultivation of mushroom and increased fruit body, 11.4~23.8% and 6.5~17.9%, respectively. However, the upper-under 33mm perforation hole of fruit body were decreased 23.8%. Also it was weak, lose vitality and the lower of biologically activity substance because the upper medium humidity was too dry.

• Journal of Chest Surgery
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• v.29 no.7
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• pp.759-762
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• 1996

Fifteen patients with esophageal perforation were treated at the Department of Thoracic and Cardiovacular Surgery, Chungnam National University Hospital during the period from June, 1985 to September, 1995. The ratio between male and female patients was 9 : 6, their age ranged from 19 years to 71 years old(a erage : 49 years old). The causes of the perforation were various, spontaneous in 4 cases, foreign body in 4 cases, instrumental trauma in ) cases, chest trauma in 1 case, drug ingestion (chlorocalchi) induced in 1 case, tracheostomy induced in 1 case, unknown in 1 case. The perforation sites were intrathoracic esophagus in 9 cases and cervical in 6 cases. The Patients complained of chest or cervi- cal pain in 11 cases, fever in 9 cases, dysphagia in 8 cases and dyspnea in 5 cases. We have performed the following surgical procedures : incision and drainage, primary repair, gastrostomy for cervical esophageal perf'oration and primary repair, primary repair and pleural flap reinforcement, gastrostomy for thoracic esophageal perforation. A patient died of sepsis.