• 터널과지하공간
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• 제27권6호
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• pp.366-376
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• 2017

가행광산 지반침하 실태조사를 통하여 현 채광방법에 따른 지반침하 가능성과 대책을 분석하였다. 금속광산은 대부분 휴 폐광 상태로서 싱크홀의 침하양상을 나타내고 있다. 석탄광은 점점 더 심부화 되어가고 있으며, 기존 채광지역에서 트러프형의 침하양상을 보였다. 비금속 광산은 대규격 광산개발 이력이 30년 이내로서 크고 작은 지반변형의 문제가 조사되었다. 채광 또한 기술적 방법보다 경험적인 방법에 더 의존함으로써 시간 의존성에 따른 지반침하 가능성이 상존하였다. 따라서 비금속 광산 위주의 체계적인 개발방법과 지반침하 방지에 대한 다양한 연구가 수행 되어야 할 것으로 본다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제34권2호
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• pp.127-132
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• 2012

Maxillary sinus hypoplasia (MSH) is an uncommon clinical disease that represents a persistent decrease in sinus volume, which results from centripetal reaction of the maxillary sinus walls. We present a unilateral MSH case of a 46-year-old male patient with a history of nasal obstruction and headache for 3 years. He had a history of Caldwell Luc operation (CLOP) 10 years ago, and no enophthalmos, hypoglobus or facial asymmetry. After confirming the right diagnosis of MSH, filled with bone in the computed tomography scan, hyperplastic bone was removed by the CLOP approach. The uncinate process and infundibular passage were found to be degenerated and ostium was also examined to be obstructed under endoscopic confirmation. MSH can be mistaken for chronic maxillary sinusitis because of the plain x-ray appearance, so the aggravated state of MSH can be the result of surgeon's misjudgment. With additional literature reviews, this rare experience is first introduced in our Korean oral and maxillofacial surgery field.

• Advances in pediatric surgery
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• 제9권1호
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• pp.35-40
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• 2003

Inguinal hernia is the most frequent problem requiring surgery in children. Moreover, subsequent contralateral occurrence after repair of the symptomatic unilateral inguinal hernia(UIH) is not rare, This study is to evaluate the diagnostic value of inguinal ultrasonography (IUS) for potential bilateral inguinal hernia (BIH). A prospective study was performed for preschool children less than 6 years of age who were diagnosed as UIH from July 1999 to December 2000. We selected 58 cases with potential BIH, based on the past history, such as prematurity, ventriculo peritoneal shunt, family history of BIH. hernia on the left side (LIH), age below 2, female, and contralateral positive silk glove sign on the physical examination, Screening with IUS and bilateral surgical exploration were applied on these cases. Forty-seven cases were males (81.0%) and 11 cases were females (19.0%). Thirty four were infants. Symptomatic right inguinal hernia (RIH) were 28 (48.3%), and LIH were 30 cases (51.7%). Six cases had no evidence of contralateral patent process vaginalis (PPV) by IUS but showed contralateral PPV by operation. Two cases were suspicious to contralateral PPV under IUS, but operative findings were negative. Fifty cases showed contralateral PPV by IUS as well as operation. The detection rate of contralateral PPV under IUS was 86.2%. The preoperative IUS may reduce contralateral exploration.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2004년도 제22회 춘계학술대회논문집
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• pp.742-748
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• 2004

In this paper are presented TSTO system analysis including some controlled variables on the engine operation such as a fuel flow rate and a pressure ratio of compressor, as well as variables on the trajectory. TSTO studied here is accelerated up to Mach 6 by a fly-back booster powered by air breathing engines. Three different types of engine cycle were treated for propulsion system of the booster, such as a turbo ramjet, a precooled turbojet and an EXpander cycle Air Turbo Ramjet (ATREX). The history of the controlled variables on the engine operation was optimized by Sequential Quadratic Programming (SQP) to accomplish the minimum fuel consumption. The trajectory was also optimized simultaneously. The results showed that the turbo ramjet gave the best fuel consumption. The optimal trajectory was almost the same except in the transonic range and just before reaching to Mach 6. The history of the pressure ratio of compressor considerably depended on the engine type. It is concluded that simultaneous optimization for engine control and trajectory is effective especially for a high-speed airplane propelled by turbojets like the TSTO booster.

• 근관절건강학회지
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• 제23권1호
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• pp.39-48
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• 2016

Purpose: This study was conducted to determine factors that influence overactive bladder (OAB) symptom severity in community residents. Methods: The participants of the study were 115 adults who participated in the health lectures for patients with OAB between March 1 and June 30, 2013. The overactive bladder-questionnaire (OAB-q) was used to assess the OAB symptom severity. Results: The mean score of OAB symptom severity was 35.48 out of 100. Participants showed the highest score of urgency among OAB symptoms. The significant predictors were the monthly income, operation history of urogynecology, and body mass index accounting for 23% of the variance of OAB symptom severity. The OAB symptom severity was higher in subjects who had lower monthly income, urogynecology operation history and higher BMI (>$25kg/m^2$). Conclusion: The findings of this study demonstrate that it should be considered to recommend weight loss as a component of nursing intervention for alleviating OAB symptom severity in overweight OAB patients.

• 대한근전도전기진단의학회지
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• 제20권2호
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• pp.119-123
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• 2018

A 14-year-old student presented with a 2-year history of progressive left foot deformity. High elevated medial arch, hindfoot varus deformity and second to fourth claw toes were idenfied in the left foot without a familial history. Neurologic examinations showed left distal lower extremity weakness and bilateral increased deep tendon reflexes. MRI of whole spine demonstrated thickened filum terminale and spinal defect covered with pulled skin which findings consistent with tethered cord syndrome (TCS). He was referred to neurosurgery department and had a detethering operation of the spinal cord. Two years later, he underwent foot surgery because his foot deformity progressed despite the detethering operation. It is very rare for TCS to present with pes cavus as the only symptom, also in Korea. We suggest that TCS should be considered as one of the differential diagnoses associated with unilateral pes cavus in adolescence so as not to miss the proper period of surgery.

• 한국의사학회지
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• 제36권2호
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• pp.1-12
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• 2023

Immediately after liberation, Shin Kwang-ryul served as the director of the Shinbukcheong People's General Hospital, and defected to South Korea alone in December 1945 with hostility to the Soviet military government. Later, he joined the political operation team (政治工作隊) and was dispatched to the Sinbuk Office as a member of Hamgyeong-do's committee. However, after this was revealed, his wife was taken to the security and tortured to death. Later, when he learned about this, he left a Wolnam Yuseo (越南遺書) and decided to commit suicide. He left politics and started a new family while running a pharmacy. In 1950, he fled Dangjin, Chungnam, during the Korean War and opened an East Asian medical clinic. In 1955, he passed the Korean Medical Examination and opened Cheongpa Oriental Medicine Clinic in Asan, Chungcheongnam-do. In 1969, he ran an East Asian medical clinic in Dohwa-dong, Mapo, Seoul, and moved to Hongeun-dong in 1972 to open Hamnam Oriental Clinic. At this time he wrote a Cheongpa Pharmacy Summary (靑坡驗方要訣). In his later years, he treated poor patients for free, and he continued to work even though he was unwell due to a broken spine. He died in 1980 leaving behind a "proud mind".

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제43권2호
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• pp.94-99
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• 2017

Objectives: Idiopathic bone cavity (IBC) is an uncommon intra-osseous cavity of unknown etiology. Clinical features of IBC are not well known and treatment modalities of IBC are controversial. The purpose of this study was to investigate the clinical characteristics of 27 IBC patients who underwent surgical exploration. Materials and Methods: A total of 27 consecutive patients who underwent surgery due to a jaw bone cavity from April 2006 to February 2016 were included in this study. Nine male and 18 female patients were enrolled. Patients were examined retrospectively regarding primary site, history of trauma, graft material, radiographic size of the lesion, presence of interdental scalloping, erosion of the inferior border of the mandible, complications, results of bone graft, and recurrence. Results: Female dominance was found. Maxillary lesion was found in one patient, and bilateral posterior mandibular lesions were found in two patients. The other patients showed a single mandibular lesion. The posterior mandible (24 cases) was the most common site of IBC, followed by the anterior mandible (5 cases). Two patients with anterior mandibular lesion reported history of trauma due to car accident, while the others denied any trauma history. Radiographic cystic cavity length over 30 mm was found in 10 patients. Seven patients showed erosion of the mandibular inferior border. The operations performed were surgical exploration, curettage, and bone or collagen graft. One bilateral IBC patient showed recurrence of the lesion during follow-up. Grafted bone was integrated into the native mandibular bone without infection. One patient reported necrosis of the mandibular incisor pulp after operation. Conclusion: Differential diagnosis of IBC is difficult, and IBC is often confused with periapical cyst. Surgical exploration and bone graft are recommended for treating IBC. Endodontic treatment of involved teeth should be evaluated before operation. Bone graft is recommended to reduce the healing period.

• Earthquakes and Structures
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• 제26권3호
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• pp.175-189
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• 2024

Aiming at studying the plastic hinge (PH) evolution regularities and failure mode of rocking wall moment frame (RWMF) structure in earthquakes, the whole-working history analysis of seismic performance state of RWMF structure based on co-operation performance and PH evolution was carried out. Building upon the theoretical analysis of the elastic internal forces and deformations of RWMF structures, nonlinear finite element analysis (FEA) methods were employed to perform both Pushover analysis and seismic response time history analysis under different seismic coefficients (δ). The relationships among PH occurrence ratios (R_ph), inter-story drifts and δ were established. Based on the plotted curve of the seismic performance states, evaluation limits for the R_ph and inter-story drifts were provided for different performance states of RWMF structures. The results indicate that the R_ph of RWMF structures exhibits a nonlinear evolution trend of "fast at first, then slow" with the increasing of δ. The general pattern is characterized by the initial development of beam hinges in the middle stories, followed by the development towards the top and bottom stories until the beam hinges are fully formed. Subsequently, the development of column hinges shifts from the bottom and top stories towards the middle stories of the structure, ultimately leading to the loss of seismic lateral capacity with a failure mode of partial beam yield, demonstrating a global yielding pattern. Moreover, the limits for the R_ph and inter-story drifts effectively evaluate the five different performance states of RWMF structures.

• 한국CDE학회논문집
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• 제1권1호
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• pp.20-32
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• 1996

The boundary evaluation technique for Boolean operation on non-manifold models which is regarded as the most popular and powerful method to create and modify 3-D CAD models has been developed. This technique adopted the concept of Merge and Selection in which the CSG tree for Boolean operation can be edited quickly and easily. In this method, the merged set which contains complete information about primitive models involved is created by merging primitives one by one, then the alive entities are selected following the given CSG tree. This technique can support the hybrid representation of B-rep(Boundary Representation) and CSG(Constructive Solid Geometry) tree in a unified non-manifold model data structure, and expected to be used as a basic method for many modeling problems such as data representation of form features, and the interference between them, and data representation of conceptual models in design process, etc.