• 한국가스학회지
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• 제26권2호
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• pp.39-48
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• 2022

중대산업사고를 일으킬 수 있는 화재, 폭발, 누출과 같은 사고를 사전에 예방할 수 있는 설비 중 하나인 가스감지기에 적용하고 있는 국내 가스감지기 설치 기준은 유해화학물질의 대기 중 거동 특성을 고려하지 않은 설치 기준을 적용하고 있어 그 기술적 근거가 부족하다고 볼 수 있다. 따라서 본 연구에서는 화학공장에서 주로 사용하는 설비별 누출공의 크기와 유해화학물질의 관심 농도에 따른 확산 거리를 분석, 이를 토대로 하여 물질 별 가스감지기 최적 설치거리를 제시하였다. 본 연구에서 제시한 방법을 이용하여 보다 경제적이고 효과적인 가스감지기 설치를 기대할 수 있으며, 나아가 중대산업사고를 예방하는데 도움이 될 것으로 기대할 수 있다.

• 한국위험물학회지
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• 제2권1호
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• pp.6-11
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• 2014

There have been frequent chemical leaks over the past 10 years. Particularly, inorganic acids like sulfuric acid, nitric acid, and hydrogen chloride take up 37 % of the total chemical accidents which took place for the past 10 years. When an acid chemical leak happens, fume is generated, diffusing into the air, which might cause serious damage to health of local residents and the environment. However, most of the acid-based chemicals, detecting and analysis methods have not been settled considering the frequency of accidents. In this study, we investigated detection and analysis methods to quickly analyze accident sites and evaluate the impacts on environments. Reviewing local and international test analysis methods of acids suggested that nitric acid, sulfuric acid, hydrogen chloride and hydrogen fluoride can be analyzed with IC. It was also found that UV is better for the analysis of hydrogen fluoride and GC/MS for acrylic acid. The analytical methods suggested in the official test methods basically have limitations of consuming much time at stages of preparation and analysis. Considering prompt responses to chemical accidents, further studies should be done to compare the applicability of rapid monitoring methods such as FT-IR, IMR-MS and SIFT-MS.

• Journal of Chest Surgery
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• 제42권1호
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• pp.100-103
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• 2009

흉부 대동맥의 외상성 파열은 두부 손상 다음으로 흔한 교통사고의 사망원인으로 약 85%의 환자가 병원 도착 전에 사망한다. 가장 흔한 기전은 고속의 차량이 충돌 등으로 인한 급작스런 감속에 의해 발생되며 대동맥 협부가 전체 대동맥 손상의 95%에 해당된다. 또 다른 기전으로는 흉부 압박 손상에 의해 골절되어 전위된 흉골병과 흉부 척추 사이에 대동맥이 끼이면서 나타날 수 있는데 이로 인해 흔하지 않은 위치의 대동맥벽의 내막이 파열된다. 저자들은 감속사고가 아닌 흉부 압박에 의해 대동맥궁이 파열되어 박리된 증례에 대해 집중적인 내과 치료 후에 지연 수술로 완전 순환정지 하에 뇌보호를 시행하면서 상행 대동맥의 일부와 대동맥궁을 인조혈관으로 치환하였기에 보고하는 바이다.

• 전기학회논문지
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• 제66권8호
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• pp.1163-1171
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• 2017

The problem of fault current to exceed the rated capacity of a power circuit breaker can cause a serious accident to hurt the reliability of the power system. In order to solve this issue, current limiting reactors and circuit breakers with increased capacity are utilized but these solutions have some technical limitations. Back-to-back high voltage direct current(BTB HVDC) may be applied for reducing the fault current. When BTB HVDCs are installed for reduction in fault current, selecting the optimal location of the BTB HVDC without causing overload of line power becomes a key point. In this paper, we use genetic algorithm to find optimal location effectively in a short time. We propose a new methodology for determining the BTB HVDC optimal location to reduce fault current without causing overload of line power in metropolitan areas. Also, the procedure of performing the calculation of fault current and line power flow by PSS/E is carried out automatically using Python. It is shown that this optimization methodology can be applied effectively for determining the BTB HVDC optimal location to reduce fault current without causing overload of line power by a case study.

• Archives of Plastic Surgery
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• 제36권1호
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• pp.80-83
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• 2009

Purpose: Isolated hypoglossal nerve palsy is a rare manifestation of various underlying disease. This article presents a rare complication of general anesthesia associated with an surgical procedure on a case of zygomatic fracture. Methods: An 18-year-old female patient was referred to our department by painful swelling on her left zygomatic area after the traffic accident. Left zygomatic complex fracture was identified on the simple x-ray and facial bone CT scan, and the fracture was treated with open reduction and internal fixation under general anesthesia. On the first postoperative day, she complained of difficulty in swallowing solid food, dysarthria and deviated tongue to her right side. There was no abnormal findings on the neurological examination, brain MRI and routine chemistry. She was diagnosed with transient hypoglossal nerve palsy and dexamethasone with multi-vitamins was administrated intravenously for 5 days. Results: The symptoms were completely resolved by the ninth postoperative day and the patient was discharged without any other complications. Conclusion: The hypoglossal(cranial nerve XII)nerve supplies motor innervation to all of the ipsilateral extrinsic and intrinsic tongue muscles. The hypoglossal nerve damage may caused by the compression between the airway and the hyoid bone during the endotracheal intubation, and direct trauma due to excessive pressure or neck extension. We described a rare case of unintended injury to hypoglossal nerve and care must be taken not to cause the hypoglossal nerve damage especially in facial plastic surgery with excessive neck extension under general anesthesia.

• Advances in pediatric surgery
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• 제11권2호
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• pp.115-122
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• 2005

Falls from a height are the leading cause of injury and death among urban children. This study describes the incidence, clinical characteristics, and treatment results of children under 15 year of age who fell from a height of more than one meter and were admitted for abdominal injury. The medical records of 585 consecutive patients treated between January 1997 and December 2003 at Ewha Womans University Mokdong Hospital were analyzed retrospectively. The falling heights were 1 to 31.2 meters, and 28 patients(4.8 %) suffered from blunt abdominal trauma. The male to female ratio was 2.1: 1. The median age of the victims was 5.5 years, and the median height fallen was 3 meters. Fifteen patients (53.6 %) were injured during the summer and seventy-nine percent of the falls occurred between noon and 9 pm. Eighteen (64.3 %) of falls occurred in residential place and 19(67.8 %) of patients arrived at the emergency department within 30 minutes of the accident. Only 16 patients (57.1 %) complained of abdominal pain. Liver injuries were found in 12(42.9 %), spleen injuries in 5(17.9 %), kidney injuries 3(10.7 %), pancreatic injuries in 1(3.6 %) and nonspecific abdominal injuries in 9(32.1 %) cases. Increased SGOT and SGPT were found in 23(82.2 %) and 18(64.3 %) cases. Eleven patients (39.3 %) had associated head injuries. Limb injuries were present in 17.9% and thoracic injuries in 7.1%. Twenty-five patients (89.3 %) recovered without operation. The median length of hospital stay was 6 days (2 -20 days). Despite the absence of abdominal symptoms or shock, falls from a height in children may carry significant intra-abdominal organ injuries. The height falling could not predict the degree of the abdominal injury. For the evaluation of potential abdominal injuries, CT scan should be utilized.

• 융합보안논문지
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• 제15권7호
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• pp.39-45
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• 2015

최근 기업이 보유한 산업기밀은 영업비밀보호법, 산업기술유출방지법 등 다양한 산업보안 관련 법률에 의해 보호 받고 있다. 그러나 그러한 보호에도 불구하고 산업기밀의 침해 및 유출사고는 해마다 증가하고 있다. 한국산업기술보호협회의 조사에 따르면 산업기밀 유출 예상 피해액은 연평균 "50조 원"으로 추정되며 이는 중소기업 4,700여 개의 연 매출액과 맞먹는 금액이다. 이처럼 산업기밀 유출은 국가와 기업의 경쟁력은 물론이고 경제적으로도 심각한 피해를 초래한다. 하지만 산업기밀 유출범죄에 대한 투자와 노력은 피해규모에 비해 한 없이 부족한 수준이며 일부 대기업을 제외한 대부분의 기업들이 산업기밀 유출보안을 위한 별도의 조직, 인력, 예산이 없어 산업기밀 유출에 대한 대응체계가 부족한 것이 현실이다. 본 논문은 국내외 산업기밀 유출범죄 분석을 통하여 산업기밀 유출에 따른 피해실태를 파악하고 발생원인, 유출경로 등 다양한 분류체계를 통하여 산업기밀 유출범죄에 대한 전반적인 흐름을 파악하여 관련 연구에 대한 기초자료가 될 것으로 기대한다.

• 한국안전학회지
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• 제26권3호
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• pp.15-22
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• 2011

Explosion and fire cause about 30 reported industrial major accidents a year by ignition source which discharge of electrostatic generated to flammable gas, vapor, dust and mixtures. It brings economically and humanly very large loss that accident was caused by fire and explosion from electrostatic discharge. Thus, it is very important that electrostatic discharge energy is to be control below not to be igniting flammable mixtures. There are two kinds of analysis model for electrostatic discharge, human body model and machine model. Human body model is available the parameter of human's electrical equivalent that capacitance is 100 pF, resistance is $1.5k{\Omega}$. To simulate and visualize the electrostatic discharge from human body need a very expensive and high voltage simulator. In this paper, we measured the value of capacitance and resistance concerned with test materials and sizing of specimen and the value of charged voltage concerned with test specimen and distance to develop an electrostatic charge/discharge simulating tool for teaching with which concerned industrial employee and students. The result of experiments, we conformed that the minimum ignition energy of methane-oxygen mixtures meets well the equation $W=1/2CV^2$, and found out that the insulating material and sizing of equivalent value having human body mode are the poly ethylene of 200 mm and 300 mm of diameter. Developed electrostatic charge/discharge simulating tool has many merits; simple mechanism, low cost, no need of electric power and so on.

• Archives of Plastic Surgery
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• 제34권1호
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• pp.115-118
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• 2007

Purpose: It is even less common traumatic pseudoaneurysm of the superficial temporal artery and rare with fewer than 200 cases reported in the recent literature. Most common causes of traumatic pseudoaneurysm is sequelae of blunt, penetrating, or iatrogenic surgical trauma. The diagnosis is based on physical findings and can be confirmed by duplex ultrasonogram, computed tomography, and angiography. Surgical resection, percutaneous embolization and conservative treatment have all been used to treat pseudoaneurysm. However recently, non invasive technique like percutaneous thrombin injection under ultrasonographic guidance has been done rather than surgical ligation. In this report, we proposed the several treatment options such as conservative treatment, thrombin injection, and surgical ligation according to the multifarous conditions of pseudoaneurysm, patient, and causes. Methods: We describe two cases of traumatic pseudoaneurysm of superficial temporal artery in which CT angiography was effective in diagnosis and characterization. One is chronic pseudoaneurysm after traffic accident, which is fusiform shape and small size. Since the patient prefered it, we proposed percutaneous thrombin injection first. But we recognize that this method failed, we used surgical ligation according to information of CT angiographic findings. The other is acute pseudoaneurysm after blunt trauma, which is large size accompanying large hematoma. So we proposed compressive dressing and aspiration of hematoma. Results: Two cases were well treated with no recurrence or complication. Conclusion: In conclusion, when selecting a treatment options, followings should be considered: pseudoaneurysm in CT angiography, chronicity, cause, and patient's preference.

• 한국건설안전학회 논문집
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• 제2권2호
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• pp.50-55
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• 2019

현재 국내 건설현장에서 안전관리가 중요해지고 있다. 안전관리가 중요함에도 건설현장의 사고는 꾸준히 늘어나고 있는 실정이다. 안전사고 중에 화재사고는 건설현장의 공기지연이나 작업 계획에 부정적인 영향뿐만 아니라 크나큰 인명피해까지 야기한다. 따라서 이번 연구의 목적은 건설현장 화재발생사례를 통해 건설현장 화재발생 요인을 추출하고, 요인 분석을 통해서 예방우선순위를 정하여 화재예방에 기여하려는 것이다. 연구 방법으로는 사례를 통한 화재요인을 선정하고, 전문가 집단을 통해 설문조사를 실시 후 AHP기법을 통해 설문을 분석한다. 전문가 집단의 설문조사를 AHP기법으로 분석한 결과는 작업자와 작업자의 하위 항목들이 상위항목들을 차지하였다. 따라서 화재예방을 위한 우선순위를 제시하였으며, 본 연구를 통해 도출된 순위별 요인들을 우선순위에 따라 통제, 관리, 활용한다면 보다 효과적인 화제예방을 이룰 수 있을 것이라 사료된다.