Run-Length Connectivity를 이용한 지문영상의 영역분리 방법의 개선

박정호,송종관,윤병우,이명진,Park Jung-Ho,Song Jong-Kwan,Yoon Byung-Woo,Lee Myeong-Jin 한국융합신호처리학회 2004 융합신호처리학회 논문지 (JISPS) Vol.5 No.4

지문이미지에서 특징점 추출 및 매칭을 위해서 지문영역과 배경을 분리하여야 한다. 지문영역과 배경을 분리하기 위해서 일반적으로 Sobel 마스크를 이용해 x축 y축의 밝기의 편차와 분산을 계산해서 문턱치보다 작은 값을 분리하게 된다. 하지만 이러한 방법만으로는 지문영역과 배경이 두 영역으로 정확히 분리되기 어려우며, 이러한 결과는 지문 인식의 계산량에 영향을 주게 된다. 본 논문에서는 지문이미지에서 배경을 효율적으로 분리하기 위해 RLC(Run-Length Connectivity)를 이용하는 방법을 제시하였다. 제시된 방법은 지문 이미지의 분산을 계산하고 문턱치를 적용하여 이진 이미지를 구한다. 이 이진 이미지는 일반적으로 여러 개의 영역으로 분할되며, RLC를 고려하여 run이 작은 영역부터 차례로 반전시킨다. 그래서 최종적으로 2개의 영역으로 분리되는 이진 이미지를 구하게 된다. 또한, 모의실험을 통하여 제시된 알고리즘이 지문이미지에서 효율적으로 계산량 감소가 됨을 보인다. In fingerprint verification and identification, fingerprint and background region should be segmented. For this purpose, most systems obtain variance of brightness of X and Y direction using Sobel mask. To decide given local region is background or not, the variance is compared with a certain threshold. Although this method is simple, most fingerprint image does not separated with two region of fingerprint and background region. In this paper, we presented a new segmentation algorithm based on Run-Length Connectivity analysis. For a given binary image after thresholding, suggested algorithm calculates RL of X and Y direction. Until the given image is segmented to two regions, small run region is successively inverted. Experimental result show that this algorithm effectively separates fingerprint region and background region.

전력 트랜지스터의 특성에 미치는 다이아몬드상 카본 passivation 막의 효과

박정호,임대순,정석구,장훈,신종한,Park, Jung-Ho,Lim, Dae-Soon,Jung, Suk-Koo,Chang, Hoon,Shin, Jong-Han 대한전자공학회 1996 전자공학회논문지-A Vol.33 No.11

Because of the novel characteristics such as chemical stability, hardness, electrical resistivity and thermal conductance, diamond-like carbon (DLC) film is a suitable materials for the passivation layers. For this purpose, DLC films are synthesized under various conditions and are characterized. Adhesive stregth is excellent and increased with the increase of the hydrogen gas flow rate. The resistivity of approximately 5.3X10$^{8}{\Omega}{\cdot}cm$ is measured by automatic spreading resistance probe analysis method. The thermal conductivity of DLC films is superior to that of PSG oxide and improved by increasing the hydrogen gas flow rate. The patterning techniques of the DLC films is developed using the lift-off and RIE methods to form 5${\mu}$m line. Finally, power transistor with the DLC film as passivation layer is fabricated and analyzed. The test result shows the improsved long-term stability and higher breakdown voltage.

활성 영역에 따른 웨이브렛 영상 부호화

박정호,김대중,곽훈성,Park, Jeong-Ho,Kim, Dae-Jung,Gwak, Hun-Seong 대한전자공학회 2002 電子工學會論文誌-SP (Signal processing) Vol.39 No.2

본 논문에서는 공간 영상의 특성과 웨이브렛 변환 사이의 상관 관계를 이용한 새로운 영상 부호화 기법을 제안한다. 제안한 방법은 먼저 윈 영상을 2ⁿ×2ⁿ 크기의 블록으로 분할 한 후, 각 블록의 표준편차에 따라 변화가 없는 활성 영역(LAR)과 변화가 큰 활성 영역(HAR)으로 분류한다. 공간영역에서 저주파수 영역은 웨이브렛 변환 대역에서 zero region으로 나타나며, 영상의 복원에 큰 영향을 미치지 않는 특성을 가지고 있다. 반면, 고주파수 영역은 영상의 복원에 있어 큰 영향을 미치는 중요계수와 관련이 있다. 본 논문에서는 이러한 특성들을 이용하여 낮-은 비트율에서도 높은 압축률을 얻을 수 있는 부호화 기법을 제안한다. 영상 부호화를 위해 저주파수 영역은 본 논문에서 제안한 LAR 부호화 기법을 적용하고 고주파수 영역의 효율적인 부호화를 위해 계층적 트리에서 비트플레인 부호화 방식과 유사한 형태의 방법을 제안하고 이를 적용하였다. 실험결과 제안한 부호화 기법은 EZW 및 SPIHT 방식에 비해 복원화질 및 전송 비트율 모두 좋은 결과를 나타냄을 확인하였으며 점진적 전송이 요구되는 분야에 적용될 수 있을 것으로 예상한다. In this paper, we propose a new method for image coding which efficiently use the relationship between the properties of spatial image and its wavelet transform. Firstly, an original image is decomposed into several layers by the wavelet transform, and simultaneously decomposed into 2$^n$$\times$2$^n$blocks. Each block is classified into two regions according to their standard deviation, i.e., low activity region(LAR) and high activity region(HAR). The region with low frequency in spatial domain does not only appears as zero regions in wavelet frequency domain like HL, LH, and HH but also gives little influence to the quality of reconstructed image. The other side, the high frequency regions are related to significant coefficients which gives much influence to image reconstruction. In this paper, we propose a image coding method to obtain high compression rate at low bit rate by these properties. The LAR region is encoded by LAR coding method which is proposed in this paper, the HAR by a technique similar to bitplane coding in hierarchical tree. Simulation results show that th,$\boxUl$ proposed coding method has better performance than EZW and SPIHT schemes in terms of image quality and transmitted bit rates, can be successfully applied to the application areas that require of progressive transmission.

종합병원의 간호인력 수요

박정호,Park, Jung-Ho 한국국방경영분석학회 1976 한국국방경영분석학회지 Vol.2 No.2

프로그래밍 학습동기 증진을 위한 스토리텔링기반 교육 모형에 관한 연구

박정호,구정모,송정범,배영권,안성훈,이태욱,Park, Jung-Ho,Gu, Jung-Mo,Song, Jeong-Beom,Bae, Young-Kwon,An, Sung-Hun,Lee, Tae-Wuk 한국정보교육학회 2009 정보교육학회논문지 Vol.13 No.1

본 연구에서는 초등학생의 프로그래밍 학습을 위해 스토리텔링기반 프로그래밍 교육 모형을 개발 현장에 적용하여 학습동기와 학업성취도 증진을 모색하였다. 학습동기에 대한 사후 검사 결과, 두 집단은 통계적으로 유의미한 차이를 보였으며 학업성취도 대한 사후 검사 결과, 두 집단 모두 사전검사에 비해 평균점수가 향상되었는데 특히, 실험집단의 평균이 비교집단의 평균보다 높게 나타났으며, 통계적으로 유의미한 차이를 보이고 있다. 본 연구의 결과 스토리텔링 전략이 프로그래밍의 학습동기 증진과 학업성취도의 향상에 직접적인 관련이 있다는 것을 밝힐 수 있었다. This research pursued improvement of learning motives and accomplishment of study by developing storytelling based education model and applying them to field for elementary students study of programming. As a result of inspection on study motives, two groups showed statistically significant different with experiment group showing higher average than comparison group. As a result of inspection on study accomplishment, both groups showed improved average points over previous inspection, and particularly experiment group showed higher average than that of comparison group The results of this research showed that storytelling strategy has direct relation with improvement of programming study motives and study accomplishment

컴퓨터과학 도입을 위한 초등컴퓨터 교육과정 연구

박정호,오필우,이태욱,Park, Jung-Ho,Oh, Pill-Woo,Lee, Tae-Wuk 한국정보교육학회 2006 정보교육학회논문지 Vol.10 No.1

Computer education currently executed at elementary schools showed problems of system of education curriculum, repetition, and lack of consistent system as a result of analyzing index for information and communication technology, education curriculum, and related literatures, and most of the education contents have difficulty to nurture logic thinking and problem-solving ability since they are composed mainly of software function learning. Concerning this issue, this study suggests an innovated computer education curriculum with reinforced information ethics field with computer principle, algorithm, and programming, in other words, a corrected and supplemented version of former content system based on computer science guidance cases of ACM education curriculum model of USA, computer education curriculum of state Tennessee, and information technology education curriculum of Great Britain judging that introduction of computer science factors are desperate to improve computer education curriculum in elementary schools.

목포인근해역 항행 위험요소에 관한 분석

박정호,금종수,노창균,윤명오,신철호,정재용,박계각,Park Jung-Ho,Keum Jong-Soo,Noh Chang-Keun,Yun Myung-Oh,Sin Chul-Ho,Jeong Jae-Yong,Park Gyei-Kark 해양환경안전학회 2004 海洋環境安全學會誌 Vol.10 No.1

목포항 접근 항행구역은 30마일 구간의 협수로로 이루어져 있으며 항로가 여러 지점에서 교차하고 있어 교통이 혼잡한 수역이다. 특히 목포구를 제외한 외측수역은 항로가 지정되어 있지 않고 어망 및 광업권이 산재하여 선박의 안전운항을 위협하고 있다. 따라서 본 연구에서는 주변 환경과 항행 위해요소 분석, 교통실태 관측조사 및 해양사고 분석을 통한 해상교통환경평가를 실시하여 항행안전을 위한 요소를 제시한다. The navigation area approach to Mokpo port consists of narrow channels with 30mile section, and the route is crossed with many fairways. In particular, fairway routeing except Mokpogu is not assigned and there are many threatening factors against the safe operation of vessel because fishing and mining areas are designated. Therefore, this paper proposed elements for safe passage through a marine traffic environmental assessment with the analysis of surrounding environment, dangerous elements, traffic survey and marine casualty.

관절 연골 손상의 병태 생리

박정호,Park, Jung-Ho 대한정형외과스포츠의학회 2005 대한정형외과스포츠의학회지 Vol.4 No.1

관절 연골 손상은 급성 손상과 만성 손상인 퇴행성 관절염으로 구분되며, 급성 손상은 연골 손상의 깊이에 따라서 미세 손상, 연골 골절, 골연골 골절의 세 종류로 구분할 수 있고 각 손상의 종류별로 서로 다른 양상의 치유 반응과 예후를 보인다. 만성 관절 연골 손상은 다양한 원인으로 인해서 발생하며 관절 연골의 전반적인 퇴행성 관절염의 형태를 보인다. 관절 연골 손상 시 초기 손상의 정도가 예후를 결정짓는데 가장 중요하고 이외에도 손상의 크기, 부위, 나이, 활동성, 비만 정도, 하지 정렬 상태등도 예후를 결정하는 중요한 요소들이다. 본 논문에서는 관절 연골 손상 시 발생하는 관절 연골 내의 병태 생리적 변화에 대하여 기술하고 비수술적인 치료 방법을 생역학적인 측면과 생물학적인 측면으로 구분하여 그 효과를 알아보고자 한다. Injury of articular cartilage can be classified into acute injury and chronic degenerative osteoarthritis Acute mechanical trauma on articular cartilage causes injuries that are divided into three distinct types based on the depth of injury: microdamage, chondral fracture, osteochondral fracture and each type has different potential of healing response and long-term prognosis. Articular cartilage undergoes degradation in response to a number of stimuli and eventually degenerative osteoarthritic changes will progress. The extent of initial injury to the articular cartilage is the most important factor affecting the long-term outcome of the healing response and other variables such as the size of lesion, site, age, activity level, obesity, limb alignment are also important factors. In this review, the pathophysiology that occurs within articular cartilage after different injuries and the effect of nonsurgical treatment mainly in physicochemical aspect and biological aspect will be discussed.

지역사회 중심 가정간호사업 운영연구(가정간호사업 운영을 위한 정보전달체계 개발Ⅱ)

박정호,김매자,홍경자,한경자,박성애,윤순녕,이인숙,조현,방경숙,Park, Jung-Ho,Kim, Mae-Ja,Hong, Kyung-Ja,Han, Kyung-Ja,Park, Sung-Ae,Yun, Soon-Nyoung,Lee, In-Sook,Cho, Hyun,Bang, Kyung-Sook 한국가정간호학회 1998 가정간호학회지 Vol.5 No.-

The purpose of this study was to develop the framework of community-based home care nursing delivery system, and to examine the validity of it. For these, home care nursing study team of College of Nursing, Seoul National University has studied home care nursing system since September, 1996, and has operated home care center since August, 1997. This study has been supported by the Korean Sience Foundation. We organized Committee of rules, and Clinical specialist consultant group for more efficient running of the home care center. In nursing station, research assistant controlled general work, and 5 home care nurses were hired for home visiting. We developed the Standards for operations, that included criteria for clients, central supply system of nursing materials, central management of nursing care cost, advertisement, patient referral system, and so forth. In our center, 108 patients enrolled, and neurologic disorders including cerebrovascular accident, and cancer were the most prevailing diseases. We tried to overcome the limitations of hopital -based home care, and to provide more accessible, efficient, safe, and stable home care nursing. Therefore, we were referred clients from patients and families, public health care center, industries, as well as from hospitals. Meanwhile, we developed home care recording system and assessment-intervention algorithm for various diseases for quality control and standardization. Also, we did continuing education, and tried to detect problems and to find solutions by regular meeting between the committee of rules and home care nurses. As the results of this study, several limitations of operation were found. First, it was difficult to manage and communicate with the doctor in the emergency situation, Second, we spent too much time for trasnsportation, because only five nurses covered all areas of Seoul and nearby cities. Third, preparation for special care of home care nurses were lacked. Forth, criteria for termination of care and frequency of home visit were ambiguous. Fifth, some difficulties were found in retrospective payment system. And finally, interconnection with home care machinery company were needed. Strategies for solving these problems were suggested.

재가 항암화학요법을 받는 암환자의 가정간호중재 알고리즘 개발

박정호,김매자,홍경자,한경자,박성애,윤순녕,이인숙,조현,신계영,방경숙,Park, Jung-Ho,Kim, Mae-Ja,Hong, Kyung-Ja,Han, Kyung-Ja,Park, Sung-Ae,Yun, Soon-Nyoung,Lee, In-Sook,Cho, Hyun,Shin, Gye-Young,Bang, Kyung-Sook 한국가정간호학회 1998 가정간호학회지 Vol.5 No.-

Cancer is a leading cause of death, and the number of cancer patients is increasing in Korea. The needs for the home care of cancer patients are increasing recently, but the standardized home care protocols are not developed yet. This study was designed to develop nursing assessment -intervention algorithms for the cancer chemotherapy patients at home. These algorithms suggest guidelines when we assess the patient's condition, and find appropriate nursing interventions, so that standardization and quality control of home care can be attained. The algorithms were processed by yes-no tree. Eleven common problems of cancer chemotherapy patients were identified by the literature review and oncology nurses' experience. These were digestive dysfunction, pain, fatigue, infection, respiratory difficulties, activity intolerance, hemorrhage, sensory disorder, edema, skin problem, and mucosal problem. The algorithm needs to be validated and modified by using for the cancer chemotherapy patients at home.