스마트그리드를 위한 상호운용성 기술

박창민,안윤영 한국컴퓨터통신연구회 2013 OSIA Standards & Technology Review Vol.26 No.3

Influence of solution pH, ionic strength, and humic acid on cadmium adsorption onto activated biochar: Experiment and modeling

박창민,한종훈,추경훈,Yasir A.J. Al-Hamadani,허남국,허지용,윤여민 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.48 No.-

Biochar was prepared by pyrolysis of torrefied loblolly pine and used as a sorbent for the removal of Cd(II)ions from aqueous solutions. The effects of pH, ionic strength, and humic acid (HA) on Cd(II) adsorptionon biochar were investigated in comparison with other sorbents, commercially available powderedactivated carbon (PAC) and multi-walled carbon nanotubes (MWNT). The order of overall adsorption forCd(II) was biochar > PAC > MWNT for the adsorbents. In addition, the results indicated that the sorptionbehaviors of Cd(II) were strongly dependent on pH and ionic strength. The maximum adsorption capacityof Cd(II) on biochar at pH 7.5 0.1 and T = 25 C was calculated to be 167.3 mg/g, much higher than otherreports. The presence of HA modifies the surface properties of biochar and enhances complexation of Cd(II) with adsorbed HA. Surface complexation modeling gave an excellentfit with the predominantmononuclear monodentate >SOCd2+ in the absence of HA and the ternary surface >SOL1Cd species in thepresence of HA as well as binuclear bidentate >(SO)2Cd species at higher pH. The results of this studyhighlight that biochar is a suitable material for the removal of environmental cadmium pollution.

야간 자율주행 안전성 향상을 위한 조명반사광 감소에 관한 기초연구

박창민 아이씨티플랫폼학회 2022 JOURNAL OF PLATFORM TECHNOLOGY Vol.10 No.3

AI 기술이 발전함에 따라 자율주행의 안전성에 관한 관심이 대두되고 있다. 최근, 자율주행의 차량이 증가하고 있지만 그에 대한 부작용을 해소하기 위한 노력은 다소 부진한 실정이다. 특히, 야간에 운행되는 자율주행 차량은 더욱 많은 문제들을 안고 있다. 운행의 다양한 환경에서 야간 주행의 환경은 매우 중요한 요소이다. 이에, 본 연구에서는 야간 자율주행 차량에서 핵심적인 문제점으로 부상하고 있는 반대 차량의 전조등 또는 주위 다양한 조명에 의해 발생되는 반사광을 감소시키는 방안을 제안한다. 이를 위하여, 먼저, 야간 주행 중에 센서에 의해 획득한 영상에서 반사광 특성 정보를 활용하여 조명 반사광을 추출한 후, 반사계수를 활용한 각 픽셀의 색상을 찾아 specular 영역을 감소한다. 그 후 영역의 밝기 성분만을 이용한 새로운 영역을 찾아 최종적으로 이를 감소하는 방안을 제시한다. 조명 반사광을 완벽히 감소할 수는 없지만 대체적으로 만족할 만한 결과를 얻을 수 가 있었다. 따라서 제안된 연구 방법이 야간에서의 자율주행에서 다양한 단점 및 문제들을 해결하고 사고를 줄이는 방법에 기여할 것으로 사료된다.

스마트폰에서 NFC를 이용한 융·복합 하이브리드 취약점

박창민,Park Neo,박원형 한국사이버테러정보전학회 2012 융합보안 논문지 Vol.12 No.4

스마트폰의 최근 보급 확대와 함께 비접촉식 초단거리 무선통신 기술인 NFC(Near Field Communication)기술이 탑재 된 모바일 NFC 단말기가 주목을 받고 있다. 본 논문은 모바일 NFC 단말기의 개방형 특성과 다양한 서비스, 통신 기술과의 접목으로 인한 보안 취 약성 발생 가능 성을 알아보고자 한다. 해커는 악성코드가 포함된 URL을 기록한 NFC 태그를 대중 교통 단말기 근처 숨겨진 장소에 부착 한다. 이는 온 오프라인이 결합된 융 복합 하이브리드 성격의 공격시도로서 스마트폰은 NFC 운용모 드 중 하나인 Reader/Writer 모드를 통해 악의적으로 부착된 NFC 태그를 인식하여 악성코드에 감염이 된다. 다음으 로 단말기 사용자 는 NFC 운용모드 중 하나인 Peer-to-Peer 모드 이용으로 불특정 다수에게 무의식적인 악성코드 확산을 돕고, 마침내 지 정된 D-day에 모바일 DDoS의 형태로 최종 목표지점을 공격한다는 취약점에 대해서 연구한다.

내용기반검색을 위한 객체분류에 대한 연구

박창민 영산대학교 2004 영산논총 Vol.13 No.-

Classification of image contributes greatly to improvement of performance on image retrieval through pruning irrelevant images. Therefore in recent years, meaningful classification of image rise as important task. In this paper, we propose classification method which classify object image into man-made object and natural object using edge, shape, texture. In the case of man-made object, edge of straight line is often found, and the constitution of pattern is regular and directive. Such characteristic is extracted using Edge diection histogram and Gabor filter, then image is classified. Through experiment, we obtain accuracy of more than 80% for classification method using each feature, and accuracy of more than 90% using majority rule.

인터넷 프리미엄 서비스를 위한 백본망 기술(BcN)

박창민 한국통신학회 2004 한국통신학회 학술대회논문집 Vol.2004 No.7

응급실 내원 환자의 무수혈적 치료에 관한 결과분석

박창민,정준영 대한응급의학회 2007 大韓應急醫學會誌 Vol.18 No.1

Purpose: The number of patients who refuse blood transfusion is increasing for not only religious reasons but also non-religious reasons. The aim of this study is to analyze the effect of non-blood transfusion and to help the management of patients who want a non-blood transfusion. Methods: We have studied on the case of 95 who refused blood transfusion. They visited the emergency department in Dong-A University Medical Center from November 2004 to July 2006, and these were reviewed retrospectively. We investigated sex, age, diagnosis, hemoglobin/hematocrit (Hb/Hct) level, the histories of transfusion. They were assigned to two groups according to the necessity of the blood transfusion. We analyzed differences in the average of Hb/Hct level, the histories of operation, numbers of nonblood transfusion, hospital stay, outcomes. Results: The patients consisted of 40 males and 55 females. the most dominant ages of the patients were in the seventies (21 patients). A blood transfusion was considered to be necessary for 17 patients (17.9%). Nobody practically received a blood transfusion. Out of those 17 patients, the average of Hb/Hct level was 5.4 g/dL and 16.7% respectively. In addition, 9 patients (52.9%) were operated, 2 (11.8%) died, and all of the 17 patients recevied the non-blood transfusion. Conclusion: The treatment of patients who want non-blood transfusion management involves important medical considerations to decrease the risk of transfusion, to improve patient outcome. The development of appropriate non-blood transfusion strategies is increasingly important, and more studies are needed to define their role by controlled clinical trials.

퓨리에 스펙트럼의 섹터 파워를 이용한 영상 분류 방안

박창민 영산대학교 2007 영산논총 Vol.17 No.-

The images are searched and matched usually based on image features such as color, texture, shape, and spatial layout. However, we know that there is obvious semantic gap between what user-queries represent based on the low-level image features and what the users think. Many researchers believe that the key to effective CBIR performance lies in the ability to access images at the level of objects because users generally want to search for the images containing particular object(s) of interest. In this thesis, a classification method of the object(s) of interest into artificial or natural classes is proposed. Artificial object images tent to have dominant orientation features in their Gabor filtering results while natural object images do not. Dominant orientation feature in artificial object images are not confined to horizontal and/or vertical direction, while those in artificial scene images tent to be greatly confined to them. One classification measure is proposed: the sum of sector power difference in Fourier power spectrum. This showed classification accuracy of 85.8% on a test with 2,600 object images.

핵심 객체 추출에 기반한 비주거 시설의 화재불꽃 추출에 관한 기초 연구

박창민 (사)디지털산업정보학회 2017 디지털산업정보학회논문지 Vol.13 No.4

Recently, Fire watching and dangerous substances monitoring system has been being developed to enhance various fire related security. It is generally assumed that fire flame extraction plays a very important role on this monitoring system. In this study, we propose the fire flame extraction method of Non-Residential Facilities based on core object extraction in image. A core object is defined as a comparatively large object at center of the image. First of all, an input image and its decreased resolution image are segmented. Segmented regions are classified as the outer or the inner region. The outer region is adjacent to boundaries of the image and the rest is not. Then core object regions and core background regions are selected from the inner region and the outer region, respectively. Core object regions are the representative regions for the object and are selected by using the information about the region size and location. Each inner region is classified into foreground or background region by comparing its values of a color histogram intersection of the inner region against the core object region and the core background region. Finally, the extracted core object region is determined as fire flame object in the image. Through experiments, we find that to provide a basic measures can respond effectively and quickly to fire in non-residential facilities.

객체지향 데이터베이스와 새로운 Unified Relation 객체지향 데이터베이스의 운용에 관한 연구

박창민 대한경영정보학회 1999 경영과 정보연구 Vol.3 No.-

This paper proposes to study on the interoperation between Relation Database(RDB) and Object-oriented database(OODB). It also describes some Characteristics of OODB and introduces the UniSQL system. This paper suggests a new systemcalled URODB (Unifide Relation & Object-oriented database) that will overcome the limits of OODB, improve the shortcomings of the present RDB, and increase the interchangeability in particular.