역전파 신경망을 이용한 작업흐름시간의 예측

문석환,김금숙 한국전문가시스템학회 1994 학술대회 Vol.2 No.1

드론비행에서 객체상황인식을 위한 초광각렌즈 왜곡보정기술

문석환 한국차세대컴퓨팅학회 2019 한국차세대컴퓨팅학회 논문지 Vol.15 No.3

This paper is for omni-directional image monitoring using drones equipped with GPS and super wide angle image lens. It proposes an algorithm that corrects and separates distorted images of super-wide-angle lens and accurately detects the surrounding information and proximity information of the object, and implements it through conversion test and empirical test. In this case, the distortion correction coefficient of the ultra-wide-angle lens was extracted by the pre-patterning operation and the 360​​° omni-directional image was transformed into the orthogonal coordinate system through the coordinate system transformation. Finally, the location information of the object is provided based on the target GPS coordinates and the state information of the object is imaged via the zoom camera. In the future, it is necessary to provide detailed image information such as reference point patch and correction point matching technique through location based search technology and fusion research. In the future, it is necessary to provide detailed image information such as reference point patch and correction point matching technique through location based search technology and fusion research. 본 논문에서는 GPS위성을 이용하는 무인 비행체분야 중 초광각 영상렌즈를 탑재한 드론의 전방위 영상 모니터링을 위해 초광각렌즈의 왜곡영상을 보정하고 분할하여 주변의 상황정보와 객체의 근접정보를 정확하게 검출하기 위한 알고리즘을 제안하고 변환 테스트와 실증 테스트를 통해 구현하였다. 여기서는 사전 패턴작업을 통해 초광각 렌즈의 왜곡보정계수를 추출하고 360˚전방위 영상을 좌표계 변환을 통해 직교 좌표계로 변화하는 작업을 수행하였다. 또한 주변 상황에 대한 정보취득을 위해 방사왜곡 보정을 한 5분할 영상으로 분할하여 테스트하였고, 최종적으로 목표물의 좌표에 기반한 줌(Zoom) 촬영을 통해 객체의 상태정보를 제공하는 시스템으로 구현하였다. 향후에는 위치기반 탐색기술과의 융합을 통해 영상의 기준점 패치 및 보정점 정합기술을 통해 세밀한 영상정보를 제공하고 분석하는 연구를 진행하거나 영상 이미지 데이터 정합기술을 활용한 지상 좌표계와 GPS 좌표계, 영상좌표계 간의 Mapping과 관련한 절대 좌표점 산출연구가 필요할 것이다.

선천성 낭성 폐질환의 외과적 치료

문석환 대한흉부심장혈관외과학회 1990 Journal of Chest Surgery (J Chest Surg) Vol.23 No.4

Congenital Cystic Lung Disease is a spectrum of closed related anomalies that arise during an early stage of embryonic lung bud maturation-namely bronchogenic cyst, congenital lobar emphysema, pulmonary sequestration and congenital cystic adenomatoid malformation. And they show similar surgical strategies. So they are called as the term bronchopulmonary-foregut malformations, firstly proposed by Gerle[1968]. From Aug. 1979 to Aug 1989, 47 patients were operated upon on Dept. of Thoracic & Cardiovascular Surgery at the CUMC. There were 21 females and 26 males ranging in age from age of 21 day to age of 56 year [15 cases under 15 years old]. 30 patients had bronchogenic cysts - 23 of intrapulmonary type, 7 of mediastinal type in location. Affected lobes and locations were as follows: 11 in upper lobe, 3 in middle lobe, 11 in lower lobe and anterosuperior, middle, and posterior mediastinal type were 3, 2, 2 respectively. There were 9 pulmonary sequestrations[all intralobar type] with the distribution of 5 in right lower lobe and 4 in left lower lobe. And associated anomalies were presented with arterial supply originating from thoracic aorta[8 cases], abdominal aorta[1 case] and with venous drainage into azygos vein[1 case]. They all were operated upon lower lobectomy [8 case], pneumonectomy[1 case] in case of pulmonary hypoplasia Congenital lobar emphysema and congenital cystic adenomatoid malformation had 4 cases respectively. Their affected lobes were as follows: the former were 3 in upper lobes, 1 in middle lobe and the latter were 3 in upper lobe, 1 in lower lobe. They were treated with lobectomy and segmentectomy. Diagnosis was aided by chest X - ray, bronchography, aortography, DSA and CT scan, They all were confirmed by pathologic exams. There were no hospital death but few minor morbidities such as, atelectasis-pneumonia[2], wound infection[2], prolonged chest tube placement[2]. We experienced surgical treatments of 47 cases for 10 years and reported them with literature review.

기관지내 발생한 폐과오종 - 1례 보고 -

문석환 대한흉부심장혈관외과학회 1989 Journal of Chest Surgery (J Chest Surg) Vol.22 No.3

Pulmonary hamartoma has been considered as rare disease, which consists of lung tumor less than 1 %. Originally described by Albrecht in 1904, hamartoma is tumor like malformation-abnormal mixing of the normal components of organ-and is applied also to tumor found in many organs other than the lung. Lately, the major conclusions are that pulmonary hamartoma is neoplastic rather than developmental error in origin. Because pulmonary hamartoma frequently mimics lung cancer, especially in cancer-risk age groups, its clinical significance is great. Recently, we experienced 1 cases of endobronchial hamartoma which located at the right main stem bronchus. The patient was a 54 year old male who was admitted due to symptoms of fever 4 chilliness and dyspnea. Radiologic studies such as chest x-ray, chest tomogram and chest C-T scan revealed that the nearly total haziness of the right lung was caused by endobronchial tumor. The mass was considered as a benign by bronchoscopic exam, so we removed it surgically by tracheobronchotomy without pulmonary resection. Postoperative chest x-ray revealed satisfactory reexpansion of previous collapsed right lung. The patient discharged uneventfully.

선천성 경부식도 협착증 - 1예 보고 -

문석환 대한흉부심장혈관외과학회 1989 Journal of Chest Surgery (J Chest Surg) Vol.22 No.3

Congenital esophageal stenosis is a rare disease in childhood. By virtue of its complex embryological development, the esophagus is the site of many congenital abnormalities. Congenital Esophageal stenosis is one tenth as rare as tracheoesophageal fistula with esophageal atresia and is very rare in the cervical esophagus, which mostly occurred below mid-esophagus. Congenital esophageal web may be caused by the resorption failure of the epithelium following the vacuolization stage in embryonic development in the esophagus. Recently, we experienced 1 cases of congenital esophageal web, as the symptoms of life-long dysphagia. According to her history of dysphagia, radiologic and clinical findings, her esophageal stenosis was considered as congenital. For dilatation and relief of dysphagia, she underwent the Heineke-Mikulicz type of esophagoplasty. The results of surgical treatment were relatively good without any clinical events. So we reported it with its literature review.

기관지 선종의 외과적 치료[17례 보고]

문석환 대한흉부심장혈관외과학회 1992 Journal of Chest Surgery (J Chest Surg) Vol.25 No.3

Bronchial adenoma, firstly described by Muller[1882] had been reported on the subject stressed their benign nature prior to 1940`s, but these tumors including carcinoid tumor, mucoepidermoid carcinoma, adenoid cystic carcinoma, pleomorphic adenoma are now known to possess the various degree of malignant natures from benign course, low grade malignant potential to distant lymphatic or hematogenous metastasis or combination. Although histologically diffeerent, four varieties except carcinoid tumor which is a spectrum of neu-roendocrine tumor originating Kulchitsky cell of the bronchial epithelium and form the part of the APUD tumor spectrum, are morphologically and in many respects clinically similar to the corresponding tumor of the salivary gland is a specific varient of adenocarcinoma that occurs most commonly in the major and minor salivary gland and less frequently tra-cheobronchial tree, esophagus etc. To better understand the clinical characteristics and assess more precisely the malignat nature of bronchial adenoma, we studied 17 cases of bronchial adenoma, which had been experienced at the Department of Thoracic and Cardiovascular surgery of Catholic University Medical College from April 1977 to september 1991. Seventeen cases of bronchial adenoma consist of 2 carcinoid tumors, 6 adenoid cystic carcinomas, 8 mucoepidermoid carcinomas and one pleomorphic adenoma. There is a slight predominace of male patients[10/17] and the age of pt studied varied with a higher incidence occurring between the ages of 40 years and 60 years[mean age, 46.5 years]; the youngest being 15 years and oldest 69 years. Their leading complaints were hemoptysis[4], exertional dyspnea[8], fever & chilness [4], and symptoms mimicking the bronchial asthma[4]. Diagnosis was aided by the radiologic studies such as chest X-ray, polytomography, CT scan, brochography and bronchoscopy. The preferred locations of fumor were in the trachea[4], main stem bronchus[3], bronchus intermedius[3], bronchus of RUL[2], LUL[1], RLL[1], LLL[3] with no peripheral location. Modalities of treatments were single or combination of surgical resection, radiation therapy, chemotherapy. Complete resections were permitted in 12 cases with late recurrences of 4 cases ranging from 6 months to 10 years: pneumonectomy[4], lobectomy[4], bil-obectomy[2], sleeve resection[2]. Gross findings of resected specimens in 14 cases showed that 4 cases were polyp-like pedunculated mass[entirely intraluminal mass] with intact mucosa, 8 cases were broad-bas-ed sessile mass[predominatly intraluminal] and the main portions were located below the mucosa similar to tip of iceburg[predominantly extraluminal] in 2 cases. Follow-up information was availble in all 17 cases ; eight were alive without evidence of disese ranging from 1 month to 13 years. But seven cases died of the causes related to tumor[6 cases within 12 months, one case 10 years after pneumonectomy]. We concluded that 8 cases[47%] of 17 cases were metastasizing bronchial adenoma and precise survival rate cannot be answered by the scanty materials available for study.

유연생산시스템의 효율적 운용을 위한 지능적 기법의 적용에 관한 연구

문석환 한국경영과학회 1999 한국경영과학회지 Vol.24 No.2

This research involves the development and evaluation of a work flow control model for a type of flexible manufacturing system(FMS) called a flexible flow line(FFL) The control model can be considered as a kind of hybrid intelligent model in that it utilizes both computer simulation and network technique Training data sets were obtained using computer simulation of typical FFL states And these data sets were used to train the neural network model The model can easily incorporate particular aspects of a specific FFL such as limited buffer capacity and dispatching rules used it also dynamically adapts to system uncertainty caused by such factors as machine breakdowns performance of the control model is shown to be superior to the random releasing method and the Minimal part set(MPS) heuristic in terms machine utilization and work-in-process inventory level

다중프로세서 시스템상의 개선된 합성 이용율을 이용한 실시간 비주기 태스크 스케줄링

문석환,Moon, Seok-Hwan 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.1

다중프로세서 시스템에서 임의의 시점에 비주기 태스크들의 스케줄링 가능성을 판단하기위한 알고리즘으로서 합성 이용율이 Abdelzaher등에 의해 제시되었는데, 이들은 임의의 시점에 합성이용율의 상한 값인 0.59를 넘지 않으면 비주기 태스크들이 스케줄링 가능 하다는 것을 증명 하였다. 하지만 이 방법은 비주기 태스크들의 프로세서 이용율 계산 시 태스크가 실제 모든 실행시간을 종료하여 더 이상의 실행시간을 갖지 않더라도 현재요청집합에 속해 있다면 실행시간과 종료시한을 합성 이용율에 포함하기 때문에 스케줄링 가능한 태스크들이 실행 불가능한 경우로 판단되는 문제점을 가지고 있다. 본 논문에서는 이러한 문제점을 해결하여 다중프로세서 시스템에서 더 많은 비주기 태스크들이 스케줄링 가능 하도록 개선된 합성 이용율 방법을 제시하였다. Abdelzaher et al. proposed an algorithm to determine the schedulability of aperiodic tasks on multiprocessor systems, and proved that the aperiodic tasks are schedulable if the upperbound of synthetic utilization is less than or equal to 0.59. But this algorithm has a drawback in that if some tasks, even though they are completed and have no more execution times, are included in the current invocation set, their execution times and deadlines are added to the synthetic utilization. This may lead to a problem in which actually schedulable tasks are decided not to be schedulable. In this paper, we recognize the above mentioned problem and propose an improved synthetic utilization method that can be used to schedule aperiodic tasks more efficiently on multiprocessor systems.

다중프로세서 시스템에서 개선된 합성 이용율을 이용한 혼합 태스크 스케줄링

문석환,Moon, Seok-Hwan 한국정보통신학회 2015 한국정보통신학회논문지 Vol.19 No.2

다중프로세서 시스템에서 실시간 비주기 태스크 스케줄링 방법 중 하나인 합성 이용율 방법은 주기 태스크들을 고려하지 않고 단지 비주기 태스크들을 위한 스케줄링 방식이다. 하지만 실제로 비주기 태스크는 대부분의 경우에 주기 태스크와의 혼합된 형태로 스케줄링이 이루어지며, 주기 태스크의 스케줄링을 보장하면서 비주기 태스크의 스케줄링 가능성을 판단해야 한다. 본 논문에서는 다중프로세서 시스템에서 주기태스크와 비주기 태스크가 혼합된 태스크 집합을 개선된 합성 이용율을 이용하여 스케줄링하기 위한 방법을 제시하였으며, 기존의 비주기 서버를 이용하여 혼합 태스크 집합을 스케줄링 하는 방법보다 스케줄링 성능이 향상됨을 보였다. Synthetic utilization on multiprocessor system is not considered periodic tasks, except scheduling methods for aperiodic tasks where one of the real-time aperiodic tasks is a scheduling method. But really aperiodic tasks scheduling method is composed of mixed task types. Aperiodic task scheduling method guarantee an analysis of the schedualibility of aperiodic task. The set of mixed tasks periodic and aperiodic tasks scheduling method uses improved synthetic utilization that is presented in this paper. The new method shows that schedulability increases aperiodic server method.

합성 이용율을 이용한 혼합 태스크 스케줄링

문석환,김인국,Moon, Seok-Hwan,Kim, In-Guk 한국정보통신학회 2010 한국정보통신학회논문지 Vol.14 No.10

O(1) time synthetic utilization is not considered periodic tasks, except scheduling methods for aperiodic tasks where one of the aperiodic tasks is a scheduling method. But really aperiodic tasks scheduling method is composed of mixed task types. Aperiodic task scheduling method guarantee an analysis of the schedualibility of aperiodic task. The set of mixed tasks periodic and aperiodic tasks scheduling method uses synthetic utilization that is presented in this paper. The new method shows that schedulability increases 20% aperiodic server method. 시간 복잡도가 O(1)인 실시간 비주기 태스크 스케줄링 방법 중 하나인 합성 이용율 방법은 주기 태스크들을 고려하지 않고 단지 비주기 태스크들을 위한 스케줄링 방식이다. 하지만 실제로 비주기 태스크는 대부분의 경우에 주기 태스크와의 혼합된 형태로 스케줄링이 이루어지며, 주기 태스크의 스케줄링을 보장하면서 비주기 태스크의 스케줄링 가능성을 판단해야 한다. 본 논문에서는 주기태스크와 비주기 태스크가 혼합된 태스크 집합을 합성 이용율을 이용하여 스케줄링하기 위한 방법을 제시하였으며 기존의 비주기 서버를 이용하여 혼합된 형태의 태스크 집합을 스케줄링 하는 방법에 비해 최대 20%의 스케줄링 성능이 향상됨을 보였다.