내용기반 이미지 검색을 위한 문자-에지 맵의 특징을 이용한 자연이미지에서의 텍스트 영역 추출

박종천,황동국,이우람,권교현,전병민 충북대학교 컴퓨터정보통신 연구소 2006 컴퓨터정보통신연구 Vol.14 No.2

자연이미지에 포함된 텍스트는 많은 중요한 정보를 포함하고 있다. 그러므로 자연이미지에서 텍스트를 추출할 수 있다면 다양한 분야에서 활용될 수 있다. 본 논문에서는 문자-에지 맵 패턴 히스토그램을 분석함으로서 텍스트 영역을 추출하는 방법을 제안한다. 첫 번째 단계로, Canny 에지 검출기로 에지를 추출하여 16가지 에지 맵을 생성하고, 두 번째 단계로 16가지 에지 맵을 조합하여 문자 특징을 갖는 8가지 문자-에지 맵을 생성한다. 세 번째 단계로 8가지 문자-에지 맵과 16가지 에지 맵을 이용하여 텍스트 후보 영역을 추출 하고, 마지막으로 텍스트 후보 영역에 대한 검증은 문자-에지 맵의 패턴 히스토그램 및 텍스트 영역의 구조적 특징을 이용하여 수행하였다. 실험결과 제안한 방법은 복잡한 배경, 다양한 글꼴, 다양한 텍스트 컬러로 구성된 자연이미지에서 텍스트 영역을 효과적으로 추출하였다. The text to be included in the natural images has many important information. Therefore, if we can extract the text in natural images, it can be applied to many important applications. In this paper, we propose a text region extraction method using pattern histogram of character-edge maps. In the first step, we extract edges with the Canny edge detector and create 16 kinds of edge maps from the extracted edges. In the second step, we make 8 kinds of character-edge maps that has a character features with combination of edge maps. In the third step, we extract a text regions using 8 kinds of character-edge maps and 16 kinds of edge maps. Finally, verification about candidate of the text regions uses pattern histogram of character-edge maps and structural features of text regions. The proposed method is experimented with various kinds of natural images. Experimental results show that the proposed method extracts a text regions composed of complex background, various letters, various text colors effectively.

김정일정권의 체제유지 전략 : 선군정치와 7·1 경제관리개선조치를 중심으로

박동국,박병철 동아대학교 동아시아연구원 2006 동아시아 : 비교와 전망 Vol.5 No.2

This paper aims to analyzes the strategic direction of regime maintenance of Km Jung—Il under the political, economic crisis after 1990s. The strategies of regime maintenance are classfied following two categories: ‘Arduous March’, ‘Military—First Politics’ as political · ideological strategy and the "New Economic Management Improvement policy"(hereafter ‘7 · 1 policy,) as economic strategy. Under the comprehensive critical condition,'Arduous March' was adopted as a 'muddling through strategy’ based on the severely forced sacrifice of people of North Korea. 'Military—First Politics‘ was an instrument for the system control. As an expression of confidence of stabiizing Kim's regime,‘7 · 1 policy’ was lunched for the purpose of the improvement of economic difficulties by introducing partly some elements of market economy. ‘7 · 1 policy’ has contributed actually to favorable turn of North Korea's economy. From this point,‘7 · 1 policy’ can be seen as a successful strategy for the regime stability. However,‘7 · 1 policy’ would be characterized as an provisional instrument which can be realized only during the economic recovering period,because Kim's regime,based on the ‘Military—First Politics’,might eliminate elements of the market economy adopted through the ‘7 · 1 policy’. The policy aims not at an application of capitalist market principles to the national economic policy, but at reestablishment of the planned economy system. It is very likely that Kim's regime would continuously expand some elements of market economy for the purpose of the regime stability until the end of economic crisis. Yet the economic reform will be continued under the influence of the 'Military—First Politics’. 본 논문은 1990년대 이후 북한 위기상황에서 김정일정권이 체제유지를 위해 제시한 전략의 방향성을 고찰하는 데 그 목적을 두고 있다. 북한에 있어 체제유지 전략은 정치 · 사상적 전략으로 ‘고난의 행군’과 ‘선군정치’와 경제적 전략으로 ‘7․1경제관리개선조치’를 들 수 있을 것이다. 북한 사회 전반적인 위기 상황에서 ‘고난의 행군’은 주민들의 회생을 통한 ‘버티기 전략’의 일환으로, 선군정치는 체제통제 수단으로 기능하고 있다. 또한 ‘7․1조치’는 김정일체제의 자신감의 표현으로, 시장경제의 부분적 도입을 통해 현실적 경제위기를 개선하려는 조치이다. 여기서 ‘7․1조치’로 북한의 경제가 호전되고 있다는 측면에서는 북한의 체제유지 전략이 성과를 거두고 있다고 볼 수 있을 것이다. 그러나 ‘7․1조치’는 북한이 계획경제를 정상화하는 동안의 과도기에 임시방편으로 활용될 가능성을 지니고 있다. 왜냐하면 북한은 강력한 체제 통제 수단인 선군정치를 바탕으로 언제든지 ‘7․1조치’로 등장한 개혁적 시장경제요소들을 제거할 수 있기 때문이다. 또한 ‘7․1조치’도 계획경제의 복귀를 목적-사회주의 경제 정상화를 위한 방법-으로 시장경제의 요소를 일부 활용한다는 차원이지, 시장경제를 사회 전반의 경제원칙으로 정립하려는 것은 아니기 때문이다. 그럼에도 불구하고 현재의 북한은 체제유지전략으로 당면한 경제 위기가 해결되기 전까지는 시장경제를 지속적으로 확대해 나갈 것으로 보이며, 이는 선군정치를 바탕으로 진행될 것이다.

초소형 전기장치에 의한 미세 전류가 치아이동에 미치는 효과

김동환,박영국,강승구 대한치과교정학회 2008 대한치과교정학회지 Vol.38 No.5

교정치료 본질인 치아이동을 보다 효과적으로 하기 위한 기계적 힘외의 다른 자극원으로서 전기적 자극에 대한 효용성이 부각되고 있다. 본 연구는 임상에서 초소형 전기장치에 의한 전기 자극이 교정적 치아이동에 미치는 효과를 실증하기 위해 시행되었다. 교정용 미니 스크류를 식립한 성인 여성 교정 환자 7명의 상악 견치 후방 견인 시 실험측에 150 gm의 기계적 교정력 외에 20μA의 직류 전류를 공급하는 초소형 전기 장치를 고안, 제작, 장착하여 견치의 근원심에 1일 5시간씩 4주간 전류 자극을 흘리고, 대조측에는 기계적 자극만을 가한 후, 매 주간 치아 이동량을 측정하여 치아이동에 있어서 전기자극의 효과를 검증하였다. 실험기간 동안 치아이동률에 있어서 실험군에서 대조군에 비해 1, 2째주에서 33%, 3, 4째주에서 21.4% 증가된 치아이동을 보였다. 실험군의 평균 치아 이동량은 1, 2째주가 3, 4째주에 비하여 컸으며, 그 차이는 각각 47%, 24% 증가된 치아 이동량을 보였다. 실험을 통하여 미세 전류가 적용되어 치아이동을 촉진할 수 있다는 것이 임상적으로 실증되었다. 생물학적으로 최적의 치아이동을 계획하여 치료계획을 단축시킬 수 있는 방법은 기계적 교정력과 전기자극을 동시에 가하는 것이라고 제안한다. Objective: The purpose of this study was to determine whether an exogenous electric current to the alveolar bone surrounding a tooth being orthodontically treated can enhance tooth movement in human and to verify the effect of electric currents on tooth movement in a clinical aspect. Methods: This study was performed on 7 female orthodontic patients. The electric appliance was set in the maxilla to provide a direct electric current of 20μA. The maxillary canine on one side was assigned as the experimental side, and the other as control. The experimental canine was provided with orthodontic force and electric current. The control side was given orthodontic force only. Electrical current was applied to experimental canines for 5 hours a day. The amount of canine movement was measured with an electronic caliper every week. Results: The amount of orthodontic tooth movement in the experimental side during 4 weeks was greater by 30% compared to that of the control side. The amount of increase in tooth movement in the experimental side was statistically significant. The amount of tooth movement in the experimental side during the first two weeks was greater than that in the following two weeks. The amount of weekly tooth movement in the control side was decreased gradually. Conclusions: These results suggested that the exogenous electric current from the miniature electric device might accelerate orthodontic tooth movement by one third and have the potential to reduce orthodontic treatment duration.

대전시 가로수 식재지 토양의 화학적 특성에 관한 연구

고소현,박관수,강길남,방병욱,김동일 충남대학교 농업과학연구소 2005 농업과학연구 Vol.32 No.1

This study was carried out to examine the effect of heavy traffic on chemical properties of soil in roadside trees of Daejeon city. Soil samples at 0~10cm and 10~30cm depths were collected from soil of the roadside trees, Platanus occidentalis. and Ginko biloba. Soil pH in heavy traffic regions were around 7.0 at 0~10 cm and 10~30cm soil depths because of spraying of calcium chloride for snow moving. The concentrations of Fe, Cd, Cu, Zn, and Pb in soil were higher in heavy traffic regions(Daejeon Station and Daehwa Industrial Complex) than in light traffic region(Chungnam National University). The result could be from rubbing and wear of car tire and metals when they travel.

수술 전 진단된 충수돌기 점액류종 1례

허광식,손현화,김동규,박찬국,김만우,김정용,기근홍 조선대학교 부설 의학연구소 2000 The Medical Journal of Chosun University Vol.25 No.1

Primary unruptured appendiceal mucocele is a rare disease. It is very difficult to diagnose preoperatively because of the rarity of classical symptoms and low incidence. Usually it is discovered incidentally during abdominal ultrasonography(US), computed tomography(CT), or appendectomy for acute appendicitis. If untreated, one type of mucoceles may rupture producing a potentially fatal entity known as pseudomyxoma peritonei, therefore preoperative diagnosis is very important. With the advent of colonoscopy, abdominal US and CT, it has been possible to preoperatively diagnose mucocele of appendix. We experienced a case of appendiceal mucocele in a 60 year-old woman who had symptoms of lower abdominal discomfort and right lower quadrant abdominal pain, and it was diagnosed preoperatively by colonoscopy, abdominal US and CT. So we present this case with review of literature.

췌장의 가성낭종 파열에 의한 하부 위장관 출혈 1예

장성종,김병수,부귀범,김동규,박찬국,김만우,김정용,박상헌 조선대학교 부설 의학연구소 2000 The Medical Journal of Chosun University Vol.25 No.1

Pancreatic pseudocysts usually develop as a complication of acute pancreatitis or repeated attacks of chronic pancreatitis. Pseudocysts may also develop as a result of traumatic injuries or neoplasms. An uncommon complication is massive hemorrhage inside the pancreatic pseudocyst. The exact mechanism of hemorrhage is unknown. Enzymatic digestion, pressure erosion from the cyst mass or a combination of these processes may play an important role. Gastrointestinal hemorrhage associated with a pancreatic pseudocyst can occur in 10 percent of cases. When hemorrhage occurs because of erosion into a blood vessel involved in the pseudocyst, surgery is indicated since the episodes of hemorrhage are often severe and may even be fatal. When there is colonic involvement, various complications may occur. The most dangerous one is spontaneous rupture into the colon, which requires immediate surgical treatment because of high incidence of fulminating sepsis or massive hemorrhage. We examined a sixty eight-year-old man complaining of hematochezia and dizziness, and reported that it was a case of massive lower gastrointestinal hemorrhage caused by pseudocyst of the pancreas ruptured into the colon associated with chronic pancreatitis. On operative findings, the peripancreatic fatty tissue had severe adhesions to transverse colon and tail portion of pancreas, where the pseudocyst had formed. A distal pancreatectomy, splenectomy and resection of transverse colon were performed. By microscopic examination, hemorrhagic necrosis and inflammatory change were observed in the pancreas specimen. The tail portion of pancreas had a 6×6 cm sized cystic mass and was proven to be a pseudocyst with no epithelial lining.

The antitumor effect of Genipin in human oral squamous cell carcinoma

Dong-Guk Park,Da-In Choi,Jihoon Kim,Hyun-Ju Yu,Ji-Ae Shin,Kyoung-Ok Hong 한국실험동물학회 2022 한국실험동물학회 학술발표대회 논문집 Vol.2022 No.7

Accuracy Comparison of GPT and SBAS Troposphere Models for GNSS Data Processing

Park, Kwan-Dong,Lee, Hae-Chang,Kim, Mi-So,Kim, Yeong-Guk,Seo, Seung Woo,Park, Junpyo The Institute of Positioning 2018 Journal of Positioning, Navigation, and Timing Vol.7 No.3

The Global Navigation Satellite System (GNSS) signal gets delayed as it goes through the troposphere before reaching the GNSS antenna. Various tropospheric models are being used to correct the tropospheric delay. In this study, we compared effectiveness of two popular troposphere correction models: Global Pressure and Temperature (GPT) and Satellite-Based Augmentation System (SBAS). One-year data from a particular site was chosen as the test case. Tropospheric delays were computed using the GPT and SBAS models and compared with the International GNSS Service tropospheric product. The bias of SBAS model computations was 3.4 cm, which is four times lower than that of the GPT model. The cause of higher biases observed in the GPT model is the fact that one cannot get wet delays from the model. If SBAS-based wet delays are added to the hydrostatic delays computed using the GPT model, then the accuracy is similar to that of the full SBAS model. From this study, one can conclude that it is better to use the SBAS model than to use the GPT model in the standard code-pseudorange data processing.

Field-emission properties of patterned ZnO nanowires on 2.5D MEMS substrate

Park, Seung-Beum,Kim, Byeong-Guk,Kim, Jeong-Yeon,Jung, Tae-Hwan,Lim, Dong-Gun,Park, Jae-Hwan,Park, Jae-Gwan Springer-Verlag 2011 APPLIED PHYSICS A MATERIALS SCIENCE AND PROCESSING Vol.102 No.1

Treatment of Pseudomyxoma Peritonei

Dong-Guk Park 대한종양외과학회 2018 대한임상종양학회 학술대회지 Vol.2018 No.2