• 대한두경부종양학회지
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• 제10권2호
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• pp.106-111
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• 1994

During a 9-year period(March 1985 to February 1994), 111 consecutive total thyroidectomies and modified or radical neck dissections were performed at 81. Vincent Hospital, Catholic University Medical College, for benign and malignant disease. There were three permanent complications, persistent hypoparathyroidism, in total thyroidectomies. Overall complications were observed 20(62.5%) in benign diseases, 47(59.5%) in malignancy. In benign and malignant thyroid diseases. the complications were transient hypoparathyroidisms (28.8%), transient hoarsenesses(21.6%), wound infections (3.6%), bleedings(3.6%), and permanent hypoparathyroidisms(2.7%). Our experience suggests that the morbidity of total thyroidectomy relates primarily to the extracapsular extension, necessitating en bloc exision accompanied by additional lymph node dissection. The low incidence of permanent complications in thyroid disease suggests the feasibility of total thyroidectomy as the operation of choice when surgeons are familiar with the technique and indications.

• 대한두경부종양학회지
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• 제15권2호
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• pp.232-234
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• 1999

두경부 영역에서 발생하는 악성종양은 원격전이가 흔하지 않으나 최근 들어 국소전이에 대한 치료효과가 향상됨에 따라 원격전이가 재발과 사망의 주된 원인이 되고 있다. 원격전이중 뇌전이는 빈도는 적으나 이환시 높은 사망률을 보이므로 뇌전이를 의심하는 증상이 있을 때는 조기발견을 위한 적극적인 진단적 접근과 이에 대한 적절한 치료가 중요하다. 본 증례와 같이 고식적 수술후 국소전이에 대한 조절이 잘 되고 있는 환자에서 지속적인 두통 및 체중감소 등의 증상이 나타나는 경우 뇌전이를 의심하여 적절한 진단 방법을 통한 조기 진단과 치료가 중요하다고 생각된다.

• 한국컴퓨터정보학회논문지
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• 제5권4호
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• pp.154-160
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• 2000

최근 정보기술의 급격한 발달과 함께 정보시스템의 개념과 역할에도 많은 변화가 나타나고 있다. 더불어 정보시스템의 효과적인 관리와 운영을 위해서는 보다 체계적인 MIS 평가가 요청되고 있는 실정이다. 이전부터 MIS 평가에 관한 많은 연구들이 이루어져 왔으나, 관점의 다양성과 MIS의 도입성과의 포괄성으로 인해 MIS 평가를 위한 사용자 만족도가 개별 시스템에서 산출되는 결과물에 대한 평가로 국한되어왔다. 이에 본 연구에서는 기존의 MIS 평가에 관한 연구들을 기초로 변화된 MIS를 종합적으로 평가할 수 있는 개념적인 프레임워크를 제시하였다. 즉 MIS도입으로 인한 결과물에 대한 사용자 만족도 및 조직 전체의 변화에 대한 만족도 등 기존의 MIS 평가에서 제시된 다양한 관점과 평가방법을 종합하여 새로운 평가 프레임워크를 제시하였다.

• 치과방사선
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• 제12권1호
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• pp.35-42
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• 1982

Post-operative maxillary cyst may arise after the surgical intervention for maxillary sinusitis with the symptoms of swelling, pain and pus discharge in the buccal region. The author analized 66 cases clinically and radiographically which were diagnosed as post- operative maxillary cyst in SNUH during 5 years (1977. 8-1982. 7). The obtained results were as follows; 1. This cyst occurred more frequently in male than in female and the incidence is the highest in the 4th decade. 2. The right side was more frequently affected than the left side. 3. Initial radical operations of the maxillary sinueses were performed mainly between the age of 15 and 24 years. 4. The duration between the initial operation and the onset of cyst was mainly from 10 to 24 years. 5. Pain, swelling and pus discharge in the buccal region were most frequent chief complaints. 6. In panoramic radiographs, most of the post-operative maxillary cysts were monolocular type, showing distinct border, with smooth margin and without any definite sclerotic border. 7. In Waters' view, 43 cases showed radiographic changes due to cyst.

• 플랜트 저널
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• 제12권3호
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• pp.32-38
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• 2016

본 연구에서는 해안 복잡지형에 2열 배치된 풍력단지 운영사례를 분석하여 후류에 의한 풍력발전기의 영향을 분석하여 풍속의 변화 그리고 난류강도의 변화를 분석하였다. 주풍향 대비 인접 풍력발전기와 이격거리가 날개직경(rotor diameter,RD) 90m 기준 4RD인 경우 후류에 의해 풍속감소 및 난류강도의 증가로 인한 발전량의 감소를 확인 할 수 있었다. 특히 후류에의한 급격한 순간풍향의 변화시, 풍력발전기의 불시정지로 발전량이 현저히 감소되었고 이를 보완하기 위하여 요브레이크를 설비를 보강 함으로써 불시정지 빈도를 감소하고 발전량을 제고하는데 효과가 있음을 확인할 수 있었다.

• Archives of Plastic Surgery
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• 제37권6호
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• pp.775-778
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• 2010

Purpose: Reconstruction of soft tissue defects with osteomyelitis in the lower third of the leg represents a challenge to plastic surgeons. Moreover, it is more arduous in multimorbid patients. One excellent option for reconstruction of these defects is to use a delayed distally based sural flap. Methods: We successfully used delayed distally based sural flap with a two-step procedure. During the first operation, radical debridement and elevation of flap were performed. The raised flap was fixed again at the donor site. The delay period ranged from seven to ten days. Between August 2008 and July 2009, we underwent operations for five patients using this technique. The size of flap varied from $10{\times}6\;cm$ to $12{\times}14\;cm$. Results: All flaps successfully survived. Partial skin loss of the grafted site was seen in two patients but no further surgical procedure was required for wound healing. Complaints of hypoesthesia on the lateral part of the foot was observed. In a three month follow-up period, hypoesthesia was resolved spontaneously. Conclusion: Delayed procedure improves the viability of distally based sural flap in high risk, critically multimorbid patients. We recommend that, if a two-stage operative approach is required, the delayed procedure should be considered.

• Journal of Chest Surgery
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• 제27권5호
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• pp.413-417
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• 1994

Adenoid cystic carcinoma usually grows in the trachea or near its bifurcation and causes obstruction of the air way. We recently experienced a 33 year-old male patient who had adenoid cystic carcinoma in the left main bronchus with the chief complaint of productive cough. On the bronchoscopy, the mass obstructed the left main bronchus completely and had nodularity and increased vascularity.The trachea was shifted to the left side and the lower lobe of the left lung was atelectatic on chest X-ray and computed axial tomogram.He underwent left tracheal sleeve pneumonectomy and lymph node dissection through bilateral thoracotomy. At first,we attempted left tracheal sleeve pneumonectomy through the left thoracotomy,however, it was very difficult to perform carinoplastic procedure after sleeve resection of 2.5cm of distal trachea and 1cm of proximal right main bronchus including whole left lung because of poor operative field and difficulty in the anastomosis of the right main bronchus to the distal end of the trachea without tension.Therefore after radical resection of the left lung we made right thoracotomy,through which we could anastomosed the distal trachea and right main bronchus with 4-0 PDS interrupted suture after mobilization of the right hilum without difficulty. The tumor was confirmed to be adenoid cystic carcinoma with metastasis to subcarinal lymph node histopathologically. Postoperative course was uneventful but he needed two bronchoscopic procedure to clear distal airway of the retained bronchial secretion. He was discharged at 14 days after operation with complete recovery.

• 한국지하수토양환경학회지:지하수토양환경
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• 제26권4호
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• pp.1-7
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• 2021

The removal of PCBs (Polychlorinated biphenyls) in aqueous phase was investigated in the ultraviolet (UV) process, ultrasonics (US) process and ultraviolet/ultrasonic (UV/US) process using PCB No.7 and Aroclor 1260. For PCB No.7 relatively high removal efficiency over 90% was obtained during 20 min in the UV process and UV/US process. On the other hand, lower removal efficiency of 50 - 70% was achieved for it consisted of individual congeners of PCBs containing 3~8 of chlorine atom. It was found that the dechlorination reaction (the photolytic cleavage of C-Cl bond) was considered as a main removal mechanism in the UV process while PCBs were removed by cavitation-induced radical reaction in the US process. No significant dechlorination occurred in the US process. Consequently, it was suggested that the UV process or UV/US process was applicable for the removal of PCBs in aqueous phase in terms of the removal efficiency and operation time. In addition, the application of saturating gas such as Ar and Air could be considered to control redox condition and enhance the severity of acoustic cavitation for the removal of PCBs.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2006년도 PAN PACIFIC CONFERENCE vol.1
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• pp.19-29
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• 2006

Drying is the least developed of all unit operations of paper and board manufacture. While groundbreaking developments were Introduced during the several past decades in forming, pressing and calendering, no radical changes occurred in drying. The cylinder-drying technology is now more than 200 years old and, while it was subject to many incremental improvements, many of its inherent problems persist. We believe that conventional drying is now approaching the end of its life and the industry is ready for a major breakthrough in drying. Indeed several innovative technologies already exist at various stages of development or commercialization. In general, the novel drying technologies are striving to increase the drying rate, improve the product quality and boost the energy efficiency of drying. A novel, drying method, $Papridry^{TM}$, which combines conductive and convective heat transfer to obtain very high drying rates, is at an advanced stage of development at Paprican. The results obtained when drying printing paper ana board on a self-standing pilot $Papridry^{TM}$ machine and on the pilot paper machine equipped with a tandem of two $Papridry^{TM}$ units demonstrate both, the high drying rate and improved product quality achieved by using this drying method. A mathematical model of this operation has been developed and the software compiled with this model was used to calculate the effect of installing a $Papridry^{TM}$ unit into an existing dryer section. The model also allows to calculate the z-direction distribution of moisture and temperature at various points of the dryer section.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.287-293
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• 2013

The annual expenditure on diesel oil and heavy oil in the construction sector is the second largest among all industrial sectors. According to the greenhouse reduction scheme of Korean Government, construction sector targeted 7.1% reduction by 2020. Although this target is not higher than other industrial sectors, it is not easy to achieve the reduction target without radical advance in technology, which cannot be expected to happen soon, considering the conservative characteristics of construction industry. Most researches on environmental issues focus on the issues related to energy saving matters during material production stage or maintenance stage, such as heating and insulation, and few deal with the issues directly related to the energy use in the construction sites. This research regards the operation of equipment for the on-site construction processes as a system and attempts to model the energy use processes related to the activities in construction sites, and provides simulation results of earth excavation and hauling processes. The result of this research is expected to aid construction planners estimating the time-based patterns of energy use and assessing greenhouse gas emission and to help selecting more energy efficient alternatives at the planning stage.