• Journal of Advanced Marine Engineering and Technology
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• v.41 no.1
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• pp.118-124
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• 2017

To investigate and analyze the cause of the failure of the connecting rod bolt and the crank pin bearing bolt of the diesel engine of this study, the following results were obtained through site surveying, the investigation of literature referring to similar failures, testing and inspection of the fracture surface, and the experience of the researchers. The fractured crank pin bearing bolt of the diesel engine is estimated to be damaged later than the connecting rod bolt. From the shape of fracture surface, it is evident that the failed connecting rod bolt is fractured by fatigue failure due to abnormally repeated loads (e.g. loosening of the connecting bolt, etc.), and is not failed by brittle fractures due to the impact load. The surface of the U-nut on the fractured connecting rod bolt has been worsening due to the improper use of lubricant (agent for prevention of thread fixing) and no usage of separating the each connecting rod on each cylinder. Moreover, there is the possibility that those poor surface conditions of the fractured connecting rod bolt have affected the failure of the connecting rod bolt of the main engine. And it could be assumed that the mechanical characteristic and manufacturing process of the failed connecting rod bolt and crank pin bearing bolt, which were made by a domestic company, conform to the design requirements for those bolts.

• Journal of Chest Surgery
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• v.35 no.8
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• pp.584-589
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• 2002

Background : The thoracic and thoracoabdominal aortic surgery is a complicated procedure that has various method of approach and protection. The authors have performed several methods to treat these diseases. Therefore, we attempt to analyze their results and risks. Material and Method: From June of 1992 to August of 2001, we performed 26 cases of thoracic aortic surgery and 10 cases of thoracoabdominal aortic surgery. There were 17 aortic dissections, 17 aortic aneurysms, one coarctation of aorta and one traumatic aortic aneurysm. The thoracic aortic replacement was performed under a femorofemoral bypass, an LA to femoral bypass, or a deep hypothermic circulatory arrest. The thoracoabdominal aortic replacement was performed under a femorofemoral bypass or a pump assisted rapid infusion. Result: There were 7 renal failures, 11 hepatopathies, 7 cerebral vascular accidents, 2 heart failures, 5 respiratory insufficiencies, and 2 sepsis in postoperative period. There were 9 hospital mortalities which were from 2 bleedings, 2 heart failures, 2 renal failures, a sepsis, a respiratory failure, and a cerebral infarction. There were 3 late deaths which were from ruptured distal anastomosis, cerebral infarction, and pneumonia. Conclusion: Deep hypothermic circulatory arrest was not good supportive methods for thoracic aortic replacement. Total thoracoabdominal aortic replacement was a high risk operation.

• Journal of the Korean Society of Radiology
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• v.7 no.5
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• pp.305-311
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• 2013

This study involves an experiment using functional magnetic resonance imaging(fMRI) to delineate brain activation for execution functional performance. Participates to this experiment of the normal adult (man 4, woman 6) of 10 people, is not inserts the metal all closed phobia and 24.5 year-old average ages which the operating surgeon experience which are not they were. The subject for a functional MRI experiment word -color test prosecuting attorney subject rightly at magnetic pole presentation time of 30 first editions and after presenting, uses SPM 99 programs and the image realignment, after executing a standardization (nomalization), a difference which the signal burglar considers the timely order as lattice does, pixel each image will count there probably is, in order to examine rest and active crossroad dividing independence sample t-test (p<.05). Overlapped in this standard anatomic image and got a brain activation image from level of significance 95%. With functional MRI resultant execution function inside being relation, the prefrontal lobe, anterior cingulate gyrus, parietal lobe, orbitofrontal gyrus, temporal lobe, parietal lobe was activated. The execution function promotes a recovery major role from occupational therapy, understanding about the damage mechanism is important. When confirms the brain active area which accomplishes an execution function brain plasticity develops the cognitive therapeutic method which is effective increases usefully very, will be used.

• Clinics in Shoulder and Elbow
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• v.11 no.1
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• pp.57-61
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• 2008

Tuberculous arthritis on the sternoclavicular joint is an uncommon disease and a delayed diagnosis can be due to the obscure clinical symptoms. We should suspect tuberculous arthritis in patients with slowly progressive pain, swelling, mild fever and a previous history of tuberculosis. Early diagnosis is important through conducting a thorough physical examination and performing laboratory tests and radiologic study. Tuberculous arthritis on the sternoclavicular joint should be treated with a combination of systemic antituberculous agents and thorough surgical debridement in marked damaged joints. When performing this operation, it is important not only to minimized the injury of the costoclavicular ligament, but also to avoid injury to the surrounding the vital structures such as the mediastinum and pleura after aggressive resection or radical debridement. We describe here 2 cases of the tuberculous arthritis on the sternoclavicular joint: one case had a good result after surgical debridement with using an anti-tuberculous agent, and the other had fatal complications such as mediastinal abscess and pleural effusion after the operation.

• Progress in Medical Physics
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• v.16 no.1
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• pp.1-9
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• 2005

The effect of the developed symmetric upper extremity motion trainer on the cortical activation pattern was investigated in three chronic hemiparetic patients using both fMRI and Fugl-Meyer test. The training program was performed at 1 hr/day, 5 days/week during 6 weeks. Fugl-Meyer tests were performed every two weeks during the training. fMRI was performed at 3T scanner with wrist flexion-extension in two different tasks before and after the training program: the only unaffected hand movement (Task 1) and passive movements of affected hand by the active movement of unaffected hand (Task 2). fMRI studies in Task 1 showed that cortical activations decreased in ipsilateral SMC but increased in contralateral SMC. Task 2 showed cortical reorganizations in bilateral SMC, PMA and SMA. Therefore, it seems that the cortical reorganization in chronic hemiparetic patients can be induced by the training with the developed symmetric upper extremity motion trainer.

• Archives of Reconstructive Microsurgery
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• v.3 no.1
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• pp.32-39
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• 1994

One hundred and sixty patients had reconstructive surgery of the lower extremity with the microsurgical technique at the department of orthopaedic surgery, Yonsei University College of Medicine from 1982 to 1989. There were ninty-six cases of men and sixty-four cases of women, in which the mean age was 23.8 years. These patients were followed for 21.4 months. The causes were 114 cases from traffic accidents, 18 cases from tumors, 12 cases from machinery injuries, 5 cases from burns, 2 cases from explosive injuries, and 9 cases from other reasons. There were 55 cases of scapular flap, 35 cases of groin flap, 23 cases of free vascularized osteocutaneous flap, 18 cases of parascapular flap, 9 cases of combined scapular and latissimus dorsi flaps, and 8 cases of segmental resection and rotationplasty. Success in reconstructive surgery with the microsurgical technique was achieved in one hundred and thirty four cases, and function and cosmetic results were excellent. Free vascularized flap with development of the microsurgical technique has taken an important role in reconstruction of large extremity defects where skin graft and distant flap were not applicable. Reconstruction of the lower extremity with the microsurgical technique is indicated with free vascularized osteocutaneous flap when there is a large defect of bone, a need for injured nerve replacement, and in the case of needed multiple staged operations. In these instences, this technique is regarded as simple one-staged reconstructive surgery.

• The Journal of Pediatrics of Korean Medicine
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• v.15 no.1
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• pp.219-227
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• 2001

중국 낙양의 평악곽씨(平樂郭氏) 정골법은 중국의학의 골상과(骨傷科) 중에서 중요한 학술유파로 널리 알려져 있다. 그 치료법에 있어서 독특하고 체계적인 시술법을 갖추고 있는데, 교정 수기법, 고정방법, 기능훈련, 약물치료 등의 내용을 포함하고 있다. 창상(創傷)에 대한 약물요법에서 "파(破) 화(和) 보(補)" 3단계로 분류된 약물사용 원칙을 제시하였는데, 즉 골정손상의 초기에는 기혈어체(氣血瘀滯)의 병리기전에 입각하여 약물은 활혈화어제(活血化瘀劑)를 주로 사용하고, 중반에는 기혈부화(氣血不和) 경락부통(經絡不通)의 기전으로 파악하고 주로 활혈통락(活血通絡)시키는 약물을 사용하며, 말기에는 구병(久病)으로 기형(氣血)이 휴손(虧損)되므로 보기혈(補氣血) 및 장근골(壯筋骨)의 약물을 주로 사용한다. 이와 같은 평악곽씨(平樂郭氏)의 正骨(정골)에 관한 약물사용 원칙을 토대로 선조의 처방과 경험방 및 후세의 통용방(協定方)을 근간으로 심은 평악곽씨(平樂郭氏)의 正骨(정골)에 대한 전통약물시리즈가 형성되었다. 이러한 처방들은 장기간의 임상활용에서 그 효과가 뛰어나고 안전성이 확보된 것으로 입증되었다. 근골통소환(筋骨痛消丸)은 활혈행기(活血行氣), 온경통락(溫經通絡), 소종지통(消腫止痛)의 효능이 있어 근골의 퇴행성 질환이나 만성 노손(勞損)으로 일어나는 종창(腫脹), 통증, 관절활동의 제한, 목 어깨 허리 다리 등의 통증, 발꿈치 통증, 골절 후 지체(肢體)의 종통(腫痛), 어혈 등에 활용한다. 활혈접골지통고(活血接骨止痛膏)는 접골속근(接骨續筋), 통락지통(通絡止痛)의 효능이 있어 골상(骨傷)을 입은 후 지체(肢體)의 종창(腫脹)이나 통증 또는 골절 등에 사용한다. 이 약은 크림제와 고약제 두가지가 있다. 평악내복접골교양(平樂內服接骨膠襄)은 활혈소종(活血消腫), 접골속근(接骨續筋)의 효능이 있어 각종 근육의 손상이나 골정상에 활용된다. 평낙전근단(平樂展筋丹)은 활혈화어(活血化瘀), 서근지통(舒筋止痛), 통리관절(通利關節), 등의 효능이 있어 타박상으로 인한 지체(肢體)의 종통(腫痛), 관절강직, 활동제한 및 골관절 질환과 풍습비통(風濕痺痛) 등을 치료한다. 전통적으로 외용(外用)에 사용되는 산제(散劑)는 마사지에 주로 활용된다. 임상에서 다양한 제형(劑型)으로 개발되어 분무형태로 쓰이는 근상정(筋傷酊)과 마사지 크림으로 사용되는 평악낙전근접마유제(平樂展筋接摩乳劑)가 있다. 소종활혈(消腫活血) 대포제(袋泡劑)는 산제(散劑)를 티팩 형식으로 사용하는 외용제형(外用劑型)이며, 서근활혈(舒筋活血), 소종지통(消腫止痛)의 효능이 있어 타박상 말기에 근육이 굳어지고, 어반이 형성되면서 통증이 나타나며, 종창(腫脹) 등이 생길 때 사용한다. 사용방법은 따뜻한 물에 담가 우려낸 다음 상처부위를 씨어주면 된다. 특별히 제작된 접골환(接骨丸)은 배보간신(培補肝腎), 익기건비(益氣健脾), 활혈통락(活血通絡), 강근건골(强筋健骨) 등의 작용이 있어 파박상이나 골절이 잘 치유되지 않고 오래 지속되는 경우에 사용된다. 이와 같은 다양한 평악곽씨(平樂郭氏)의 전통적인 정골(正骨)에 관한 약물들은 약리학적 실험을 거쳐 그 독성반응이나 부작용 및 임상효과를 관찰한 결과 통제학적으로 p<0.05-0.01로 나타나 98%의 치료효과를 보였으며, 독성 및 부작용이 없어 안정성이 인정되었으므로 긍정적인 치료효과를 확인할 수 있었다.

• Journal of the Korean Electrochemical Society
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• v.10 no.4
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• pp.306-310
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• 2007

Characteristics of GDL (Gas Diffusion Layer) mainly determine the gas diffusion and water removal in a cell, thereby changing the performance and affecting durability of PEFC. To optimize the water management and understand the two phase flow in a GDL, it is important to study the behaviors of GDL micro structure under the real operating condition. In the clamped condition of cell, the GDL beneath the rib is more compressed than beneath the channel. Many researches on physical, electrochemical, mechanical behaviors of gas diffusion layer has been conducted. However, changes in surface properties under clamped condition have rarely studied. In present study, the morphology of broken connections of carbon fibers and detachment of PTFE coatings on the fibers were shown from the microscopic observations. In addition, changes in wetting properties of GDL by compression were investigated by using XPS and liquid uptake methods. The hydrophobic characteristics of GDL surface beneath the rib of the flow field plate are changed due to the deformation of micro structure.

• Journal of Oral Medicine and Pain
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• v.32 no.3
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• pp.263-272
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• 2007

The purpose of this study was to analyze the nerve damage after tooth extraction and implant surgery, and to establish a predictive model for assessment and management of dysesthesia. In this questionnaire study, the subjects chosen for this study were 276 dentists who answered the questionnaire about dysesthesia after tooth extraction and implant surgery. The analysis of the results consist of the sex and age distribution, affected site, associated symptoms, rate and duration of the recovery. The results are summarized as follows. : 1. There were no significant difference between the sex and the dysesthesia. 2. The most common affected site was the mandibular region. In the group of the implant surgery, 100% affected the mandibular site. The tooth extraction group was 93.2% affected. 3. Pain was one of the most associated symptom with dysesthesia-46.5% of the tooth extraction and 44.8% of the implant surgery. 4. The recovery ratio was 72.3% in the tooth extraction, 71.8% in the implant surgery. Most of them, they recovered in $1{\sim}6$ months. In conclusion, most of dysesthesia may be recovered within 1 year. However, the possibility of persistent dysesthesia should not be neglected. Therefore, practitioners must discuss the possibility of nerve injury with their patients, and include this possibility in the consent forms. Various methods of monitoring recovery of sensation should be considered for objective assessment of prognosis. In addition, immediate referral to orofacial pain specialists can offer the patients an opportunity for more effective and noninvasive treatments.

• Journal of the Korea institute for structural maintenance and inspection
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• v.24 no.1
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• pp.16-23
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• 2020

Water pipes are important facilities and consist of pipes of various specifications and materials. The annual average number of earthquakes in Korea is steadily increasing. Therefore, in case of the water pipe, it is estimated necessary to prepare for earthquakes. Damages to the water pipe by the earthquake can cause problems such as water supply and fire suppression, and cause damage to life and property. In Korea, however, it is difficult to find examples of seismic performance evaluation of water pipes based on experimental study. Damage to the water pipes by the earthquake is caused by the displacement-controlled behavior of the ground which is the liquifaction and fault lines. Especially, The damage to the water pipes by the earthquake is concentrated on the joint of the pipe. In particular, piping less than 200mm in diameter was found to be dangerous. Thus, in this study, the seismic and settlement performance of iPVC buried water pipes with fixed joints with a clamp of 150mm was evaluated with a test approach.