• 대한두개안면성형외과학회지
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• 제24권1호
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• pp.37-40
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• 2023

Penetrating wounds to the face are cosmetically devastating and can be life-threatening. If the foreign body causing the penetrating wound is a piece of wood, small remnants might be left behind after the initial treatment. A 33-year-old male patient presented to the emergency center after a piece of lumber pierced his face as a passenger in a traffic accident. The patient's vital signs were stable, and emergency surgery was performed to remove the foreign body and repair the soft tissue. No noteworthy complications were seen after open reduction and internal fixation of the facial bone fractures. Seven months after the accident, the patient underwent scar revision along with full-thickness skin grafting for post-traumatic scars. After the surgery, pus-like discharge which was not previously present was observed, and the graft did not take well. A residual foreign body, which was the cause of graft failure, was found on computed tomography and the remaining foreign body was removed through revision surgery. The patient is receiving outpatient follow-up without any complications 6 months after surgery. This case demonstrates the importance of performing a careful evaluation to avoid missing a residual foreign body, especially if it is of wooden nature.

• 자원환경지질
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• 제57권1호
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• pp.17-23
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• 2024

Ground penetrating radar (GPR) survey is a geophysical method that utilizes electromagnetic waves reflecting from a boundary where the electromagnetic property changes. As the frequency of the antenna is about 25 MHz ~ 1 GHz, it is effective to acquire high resolution images of underground pipe, artificial structure, underground cavity, and underground structure. In this study, we analyzed the change of signals reflected from the same underground objects according to the arrangement of transceiver antennas used in ground penetrating radar survey. The antenna used in the experiment was 200 MHz, and the survey was performed in the vertical direction across the sewer and the parallel direction along the sewer to the sewer buried under the road, respectively. A total of five antenna array methods were applied to the survey. The most used arrangement is when the transmitting and receiving antennas are all perpendicular to the survey line (PR-BD). The PR-BD arrangement is effective when the object underground is a horizontal reflector with an angle of less than 30°, such as the sewer under investigation. In this case study, it was confirmed that the transmitter and receiver antennas perpendicular to the survey line (PR-BD) are the most effective way to show the underground structure. In addition, in the case where the transmitting and receiving antennas are orthogonal to each other (XPOL), no specific reflected wave was observed in both experiments measured across or parallel to the sewer. Therefore, in the case of detecting undiscovered objects in the underground, the PR-BD array method in which the transmitting and receiving antennas are aligned in the direction perpendicular to the survey line taken as a reference and the XPOL method in which the transmitting and receiving antennas are orthogonal to each other are all used, it can be effective to apply both of the above arrangements after setting the direction to 45° and 135°.

• ETRI Journal
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• 제40권4호
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• pp.546-553
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• 2018

Since the Gyeongju earthquakes in 2016, there have been increased research interests in the areas of seismic design, building collapse, and rescue radar applications in Korea. Ground penetrating radar (GPR) is a nondestructive electromagnetic method that is used for underground surveys. To properly design ground penetrating radar that detects buried victims precisely, it is important to study electromagnetic wave propagation channel characteristics in advance. This work presents an electromagnetic propagation environment analysis of a trapped victim for GPR applications. In this study, we develop a realistic collapse model composed of layered reinforced concrete and a victim positioned horizontally. In addition, the effects of rebars and the distance between the radar antenna and target are investigated. The numerical analysis presents the electromagnetic wave propagation characteristics, including amplitude loss and phase difference, in the 450-MHz and 1,500-MHz frequency band, and it shows the electric field distribution in the environment.

• 수산해양기술연구
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• 제54권3호
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• pp.193-203
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• 2018

Capture efficiencies of commercial shrimp trawls may improve if their designs took into better account behavioral responses of wild shrimp to approaching cod-end of the trawls. Here we report results of water tunnel-based experimental studies of responses of wild California target prawns to several different near-realistic netting configurations over a range of water velocities (0.3-0.7 m/s). Netting panels were oriented at parallel to water flows (FP) on the bottom of test section, vertical (VT) or diagonal sloping backward (DG), bottom to top. Behavioral responses were recorded by video camera and analyzed frame by frame. Measured responses included rates of penetrating through netting by behavioral features and tail-flip frequencies. Frequencies of prawn passing through the nets increased with flow speed for both orientations and were higher at given speeds for sloped nets. Other behavioral features (e.g., passage head-or tail-first) also varied significantly with water velocities and netting orientation. Interactions of penetrating rates between netting orientations and flow speeds also were significantly dependent, except for prawn size. Additional studies are needed of other shrimp species and at higher water velocities more similar to actual field operations using trawls to improve size selectivity.

• 한국전자파학회논문지
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• 제29권1호
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• pp.61-67
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• 2018

지하의 비균일성이 지하탐사레이다(GPR) 신호에서 금속관 탐지에 미치는 영향을 수치계산으로 조사하였다. 지하의 비균일성을 모델링하기 위해서 연속적인 랜덤 매질(CRM) 생성기법을 도입하였고, GPR 신호의 전자기 모의계산을 위해 유한차분시간영역(FDTD)법을 구현하였다. 랜덤 비균일 지하에 대한 상대 유전율 분포의 표준편차와 상관길이의 변화에 따라 매설된 금속관의 GPR 신호를 수치 모의계산으로 비교하였다. 지하의 비균일성이 증가함에 따라 지하 클러터의 영향으로 인하여 매설관에 의한 GPR 신호가 심하게 왜곡되었다.

• Journal of Korean Neurosurgical Society
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• 제50권6호
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• pp.532-534
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• 2011

Temple trauma that appears initially localized to the skin might possess intracranial complications. Early diagnosis and management of such complications are important, to avoid neurologic sequelae. Non-penetrating head injuries with intracranial hemorrhage caused by a driven bone fragment are extremely rare. A 53-year-old male was referred to our hospital because of intracerebral hemorrhage. He was a mechanic and one day before admission to a local clinic, tip of metallic rod hit his right temple while cutting the rod. Initial brain computed tomography (CT) and magnetic resonance imaging demonstrated scanty subdural hematoma at right temporal lobe and left falx and intracerebral hematoma at both frontal lobes. Facial CT with 3-D reconstruction images showed a small bony defect at the right sphenoid bone's greater wing and a small bone fragment at the left frontal lobe, crossing the falx. We present the unusual case of a temple trauma patient in whom a sphenoid bone fragment migrated from its origin upward, to the contralateral frontal lobe, producing hematoma along its trajectory.

• Journal of Chest Surgery
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• 제21권3호
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• pp.471-478
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• 1988

We evaluated forty cases of traumatic diaphragmatic injuries that we have experienced from Jan. 1972 to Dec. 1987. 28 patients were male and 12 were female[M:F=2.3:1]. The age distribution was ranged from 4 to 71 years with mean age of 26. The diaphragmatic injuries were due to blunt trauma in 27 cases[traffic accident 22, fall down 3, others 2] and penetrating trauma in 13 cases[stab wound 11, gun shot 1, other 1]. In the blunt injury,14 cases of 17 were diagnosed and treated within 24 hours in the left diaphragmatic injury but only 3 cases of 7 cases in the right diaphragmatic injury were diagnosed and treated within 24 hours. All cases except one in penetrating injury were diagnosed and treated within 12 hours. In the blunt injury, the rupture site was located in the left in \ulcorner7 cases and in the right in 7 cases. In the penetrating injury, the rupture site was located in the left in 11 cases and in the right in 2 cases. The repair of 37 cases were performed with thoracic approach in 20 cases, thoracoabdominal approach in 12 cases and abdominal approach in 5 cases. Over all mortality was 17.5%[7/40] and postoperative mortality was 11%[4/37]. The causes of death were hypovolemic shock[3], combined head injury[2], acute renal failure[1] and septic shock with ARDS[1].

• Journal of Chest Surgery
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• 제41권5호
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• pp.647-650
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• 2008

대동맥수술 후 대동맥질환의 재발은 주로 하부에 대동맥류의 형태로 나타나며 상부에 침투성 동맥경화성 궤양의 형태로 나타나는 것은 매우 드물다. 대동맥류 수술의 기왕력을 가진 환자에서 대동맥궁과 하행대동맥의 근위부에 걸쳐 발생한 침투성 동맥경화성 궤양의 파열을 완전순환정지 하에 인조혈관을 사용하여 패취봉합을 성공적으로 시행하였기에 문헌고찰과 함께 보고하는 바이다.

• 한국응용과학기술학회지
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• 제30권4호
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• pp.672-678
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• 2013

Although the basalt fiber has superior fire-resistance and chemical resistance, it has many disadvantages in its applications. Generally, the tensile and loop strengths of basalt fiber were decreased with generated frictional heat during industial appplications. To solve this problem, polytetrafluoroethylene (PTFE) coating system was introduced and a sutable coating condition was evaluated. The basalt fiber was pre-treated with triethoxytrifluoropropylsilane (TMTFPS) at various pHs and then coated with PTFE dispersions with penetrating agent sodium bis(2-ethylhexyl)sulfo succinate (DOS-Na) to increase the tensile and loop strengths as well as to reduce the fibril during working. A universial testing machine (Instron Model 3366) was used to measure tensile and loop strengths. When the PTFE dispersion with 0.25 wt% of DOS-Na was coated on the surface of basalt fiber after pre-treating with 5 wt% of PTFE, the highest tensile and loop strengths were reached to 3.5 gf/D and 2.4 gf/D, respectively.

• 대한족부족관절학회지
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• 제6권1호
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• pp.117-120
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• 2002

We experienced 1 case of the giant cell tumor of the tendon sheath penetrating the middle phalanx of the third toe. Patient had painless huge mass all around the third phalanx of the foot which made a penetrating hole through the middle phalanx of the third toe in plain radiography. The period from the onset of the symptom until operation was about several years. The mass extended to the base of the distal phalanx and compressed digital nerves and vessels. Patient presented with a chief complaint of the pain on the plantar aspect of the toe and limitation of the motion of the distal interphalangeal joint. Giant cell tumor of the tendon sheath was cured by total en block resection.