드론 및 등반 로봇을 활용한 교량의 딥러닝 기반 균열 평가

안윤규(Yun-Kyu An),배현진(Hyun Jin Bae),장근영(Keun Young Jang) 한국비파괴검사학회 2021 한국비파괴검사학회지 Vol.41 No.6

본 연구는 드론 및 등반 로봇을 활용하여 취득한 사회기반시설물 영상에 대해 딥러닝 기반으로 균열을 평가하는 기법을 제안한다. 디지털 카메라를 부착한 드론과 등반 로봇 시스템을 구축 및 활용하여 교량의 고교각에 발생한 균열을 계측하기 위한 각 시스템의 장단점을 비교 분석하였으며, 분석한 장단점을 기반으로 각 시스템에 적합한 딥러닝 네트워크를 개발하여 균열을 자동으로 검출 및 평가하였다. 본 제안 기술은 강원도 춘천시에 있는 등선교와 강릉시에 있는 장덕교에서 각각 드론과 등반 로봇을 활용하여 실험적으로 검증하였다. This paper presents a deep learning-based crack evaluation of civil infrastructures using drone and robot. Digital camera-embedded drone and climbing robot systems were developed for the automated crack evaluation of high-rise bridge piers. The optimal deep learning networks for the drone and climbing robot were proposed by analyzing the advantages and disadvantages of each system. The proposed techniques were experimentally validated using the drone and climbing robot systems at the Deung-Seon bridge in Chuncheon city and the Jang-Duck bridge in Gangneung city, South Korea.

고선형 단축파 대역 Up-Mixer 설계

장진석,채규성,윤상웅,김창우 慶熙大學校 레이저 工學硏究所 2007 레이저공학 Vol.18 No.-

A single-side band double-balanced mixer using the Gilbert cell structure has been designed with the TSMC 0.18 μm CMOS library. The SSB Up-Mixer consists of a core, IF balun-phase shifter, and LO balun-phase shifter block. In the core block, 4-source-coupled degeneration resistors are used to improve the mixer's linearity. The SSB mixer exhibits a 6.8 dB conversion gain with a - 5.7 dBm P_(1-dB) for IF power of 11.5 dBm and LO power of 0 dBm inputs. The image rejection ratio is - 37.7 dBc at a -5.7 dBm output power.

모 통신관련, 사업장 연작업자들의 건강수준 평가

장덕희,황보영,리갑수,김화성,이성수,안규동,이병국 순천향대학교 산업의학연구소 1997 순천향산업의학 Vol.3 No.1

To evaluate the health status of lead workers in telecommunication industry, author studied 369 male workers working in a telecommunication industry. Study variables chosen were blood zinc protoporphyrin(ZPP), hemoglobin, serum glutamic oxalacetic transaminase(SGOT), serum glutamic oxalacetic transaminase(SGPT), γ-glutamyltrans-peptidase(GGT) and hepatitis B virus antigen and antibody. Personal data such as smoking and drinking habit, work duration were also collected. 15 lead related symptom questionnaires were provided to all lead workers and filled up by themselves and reconfirmed by physician. The results were obtained as follow; 327 workers(89%) among 369 workers were healthy and 42(11%) workers abnormal health state. 9 workers were disease state among 42 workers those who were abnormal health state. The most frequent disease was liver disease(52.4%), and next was hypertension(26.2%) and then anemia(9.5%), hyperlipidemia(4.8%) and pulmonary tuberculosis(4.8%) in order of frequency. There was no case of lead intoxication. The mean of blood ZPP concentration of study subjects was 14.4±6.9㎍/㎗ and maximum blood ZPP concentration was 48.0㎍/㎗. The means of GOT, GPT and GGT were 29.4±10.0unit/L, 19.7±14.4unit/L and 38.7±31.5unit/L, respectively. The prevalence rate of hepatitis B virus antigen was 6.8% and the one of hepatitis B virus antibody was 43.6%. The symptoms with high prevalence rate above 40% were six; 'loss of appetite', 'frequent numbness of fingers or feet', 'feeling tired or fatigue generally', 'becoming nervous or sensitive to not important things', 'feel dizziness when standing up', and 'feel sleepy frequently'. The prevalence rate of symptoms were increased by the increase of age. The prevalence rate of symptoms were higher in smoking group and drinking group than non-smoking group and non-drinking group, respectively.

공동주택 최상층과 지상1층 차별화계획의 효과 및 개선방안 연구

장한두,이규인,제해성 대한건축학회 2003 대한건축학회논문집 Vol.19 No.10

The purpose of this research is to analyze various types of the additional design alternatives of apartment housing units at ground and top floors which is recently supplied by developers in Korea, and to find out their effects on residents and to suggest design enhancements. For this research, first, eleven apartment housing estates are selected through literature review and field survey, and types of design alternatives are categorized. Second, the effects of the design alternatives on the residents are analyzed based upon survey. Third, a direction of design enhancement is suggested through analyzing residents' behavior and needs. The results of this study are (1)to verify the seven types of the design alternatives. They are ⅰ)attic at top floor unit, ⅱ)rooftop terrace at top floor unit, ⅲ)living room enlarged floor height at top floor unit, ⅳ)duplex unit at top floor, ⅴ)private garden at ground floor unit, ⅵ)private accessibility at ground floor unit, ⅶ)underground storeroom at ground floor unit, (2)to analyze the effects of design alternatives on the residents, which are composed of the spacial feasibilities of ⅰ)connection to ground, ⅱ)exposition to open air, ⅲ)diversity of composing interior space, ⅳ)flexibility of various usage and ⅴ)openness of interior space, and (3)to suggest a direction of design enhancement of the alternatives at ground and top floors for higher performance.

컴퓨터 비젼시스템을 이용한 평면상에 있는 점위치 결정에 관한 연구

장완식,이규태,김재확 朝鮮大學校 機械技術硏究所 1998 機械技術硏究 Vol.1 No.1

비젼 시스템이 개발되기 시작한 것은 1973년에 PDP-10 컴퓨터를 이용한 물펌프 조립이 시각정보를 이용하여 Stanford 연구진에 의해 수행되었다. 그 이후, 비젼 시스템이나 비젼센서가 활용되는 예로는 용접, 운반, 조립, 측정 검사 등이 있으나, 지능로봇중의 한 분야로 로봇 비젼시스템을 생산현장에 적용하는 경우가 늘고 있다. 비젼을 사용하면 매니퓰레이터가 우주 공간이나 수중등 실제 공간에서 그 위치와 방향이 불확실하게 알려져 있을지라도 작업을 수행할 수 있다. 따라서, 로봇 비젼 시스템은 주로 대상물의 위치가 불규칙하거나 기구학적으로 위치결정을 하기 어려운 작업의 자동화에 적용이 널리 확대될 것으로 예상된다. (1)(2)(6)(7)(8) 로봇에 비젼을 적용할 때 실제 공간은 3차원인 반면에 비젼 정보는 2차원이기 때문에 카메라 좌표계와 매니퓰레이터나 실제 공간 좌표계를 일치시켜 주는 보정은 가장 중요한 요소중의 하나이다. 카메라 교체시나 카메라 위치 수정시에도 필히 보정을 다시 시켜줄 필요가 있다. 만약 보정이 정확하게 되어 있지 않으면 매니퓰레이터의 경우 올바른 제어를 하지 못할 우려가 있고, 또한 부적절한 보정계수 산출로 인한 목표점의 추정이 어긋나게 된다.(3) 이리하여 본 연구는 이러한 문제점을 해결하기 위하여 6개의 시각 매개변수를 이용한 새로운 비젼 시스템 모델을 제시하고, 2차원 평면 점위치 결정 실험을 통하여 제시한 비젼 모델의 적합성을 검증한다. 본 실험에서 사용되는 비젼 시스템은 두 대의 고정된 카메라를 작업공간에 설치하여 이용한다. 본 연구의 제한 조건은 평면상에 존재하는 알려지지 않은 물체의 위치 결정을 위해서는 그 물체 주위에 알려진 몇 개의 좌표값이 존재해야 한다는 것이고, 본 연구에서는 알려지지않은 점으로부터 위치가 알려진 점과의 거리에 대한 상관관계, 위치가 알려진 점의 개수에 대한 상관관계 및 결정된 물체 위치의 정확성을 실험을 통하여 검증하고자 한다. This paper presents the application of computer vision for the purpose of determining the position of the unknown point in the plane. The presented control method is to estimate the six view parameters representing the relationship between the image plane coordinates and the real physical coordinates. The estimation of six parameters is indispensable for transforming the 2-dimensional camera coordinates to the 3-dimensional spatial coordinates. Then, the position of unknown point is estimated based on the estimated parameters depending on the cameras. The suitability of this control scheme is demonstrated experimentally by determining position of the unknown point in the plane.

뇌하수체 종양 제거술 시행 후 뒤늦게 발생한 횡문근 융해증과 동반된 중추성 열

장제혁,최규남,김일환,노은지,김윤정,유충헌,고정해,박봉수,김태균,권민정,이순희,박정현 인제대학교 2008 仁濟醫學 Vol.29 No.-

Body temperature is controlled by thermoregulatory center of the hypothalamus. We report a case of 24 years old man with central fever. He was subjected to a partial excision of pituitary tumor compressing optic chiasm four years ago. He has received hormonal therapy for panhypothyroidism after removal of pituitary tumor. And He received gamma knife operation for partially contrast-enhancing masses in suprasellar and both hypothalamic areas that is probably postoperatively remnant or recurrent tumor of pituitary adenoma. One year after gamma knife operation, he presented with a febrile syndrome of unknown origin including rhabdomyolysis. All usual investigations proved negative. We diagnosed him as central fever with rhabdomyolysis. He received medical ICU care with cooling bed, ice pack. And his symptom improved. Postoperative hyperthermia may result following resection of the pituitary tumor. When central fever is suspected taking note of past history, a quick recognition of course of fever can help reduce the using of unnecessary antibiotics and hospital stay.

900MHz 대역 고선형 CMOS 상향 주파수 혼합기 설계

장진석,채규성,윤상응,김창우 경희-다반 ASIC 설계교육센터 2007 경희-다반 ASIC센터 논문집 Vol.8 No.-

Gilbert Cell 구조를 이용한 이중평형형 성향 주파수 혼합기를 TSMC 0.18 μm CMOS library로 설계하였다. 상향 주파수 혼합기는 Mixer Core, IF balun 과 LO balun 블록으로 이루어져있다. Mixer Core 블록과 IF balun블록에서, 4매의 source deeeneration 저항이 주파수 혼합시의 선형성을 향상시키기 위해 사용되었다 .설계된 상향주파수 흔합기는 -8 dBm의 입력전력과 0 dBm의 LO전력일 때 , 8.7dB 선형변환이득를 갖는 -0.3 dB의 실출력압축전력 얻었다.

말초 신경에 발생한 종양과 종양양 병변의 면역조직화학적 연구

장현진,송규상 충남대학교 의과대학 지역사회의학연구소 1990 충남의대잡지 Vol.17 No.1

An immunohistochemical study was performed on the tumorous and tumorlike lesion of the peripheral nerve by application of S-100 protein, epithelial membrane antigen, and vimentin, and included 4 cases of traumatic neuroma, 5 cases of neurofibroma. 5 cases of plexiform neurofibroma, 6 cases of schwannoma, and one case of ganglioneuroma. The results are as follows: 1. The main lesions of all cases stained diffusely for S-100 protein. However, perineurial cells of traumatic neuromas and the capsules of schwannomas were negative. 2. Perineurial cells of traumatic neuromas showed EMA positivity. In all schwannomas and neurofibroma, positivity for EMA was weak and limited to a few compressed layers at the periphery. 3. Vimentin was expressed in the main lesions fo all cases and also showed positive reactions in perineurial cells of traumatic neuromas and the capsular areas of all lesions.

한 점의 피부온도를 이용한 평균피부온도의 산출

최장규 고신대학교 의과대학 2010 고신대학교 의과대학 학술지 Vol.25 No.1

Mean skin temperature (Tsk) is a common parameter in the study of human's temperature regulation. The purpose of this study was to propose a conventional formula to estimate Tsk from one point local skin temperature (Ts). Infrared thermography was carried out in 10 naked males at rest while decreasing the room temperature from 40℃ to 4℃ at 4℃ intervals. Tsk and Ts were measured from 110 whole-body infrared thermograms using an image processing system. Ts was taken at 17 different sites as the temperature of one pixel, corresponding to 1.24㎠ plane area. Tsk was measured as the mean temperature of 10,841 pixels that was equivalent to about 88% of total body surface area, and it changed from 34.2℃ to 24.4℃ in average. Each of the Ts was linearly proportional to Tsk (r = 0.92∼0.99, p<0.001), suggesting that Tsk can be estimated from one point Ts. The standard error of estimates in 17 linear regression equations were ±0.4∼1.3℃. By the way, the physiologically reliable error range in Tsk estimation was assessed to be valid at below 0.5℃. In the estimation of Tsk using one point Ts, therefore, we proposed 4 different linear formulas of which the standard error of estimate was less than 0.5℃. The accuracy of the proposed formulas was 75∼85% in the error range of ±0.5℃ and 95∼99% in the error range of ±1.0℃, respectively. However, because of lower accuracy than 95% in the physiologically reliable error range, the proposed formulas should be suitable to use in the field and its corresponding studies.

자기 주도적 학습능력 신장을 위한 영어 학습 웹 코스웨어의 설계 및 구현

장규화,노영욱 신라대학교 교육과학연구소 2001 교육과학연구 Vol.- No.6

The education of our country enters very important turning point toward one great goal, to educate the men of ability who are ready for the 21th century. To achieve this purpose, we should teach students who can perform their learning activity by themselves through free investigation an gathering information instead of providing a piece of knowledge to them directly. In other words, we need to bring up students who have the ability to live their lives self-directedly. In this study, we designed and implemented a virtual English conversation class using Web and DBMS to meet such need. This study will help students learn English conversation effectively by improving their creativity and self-directed learning ability through the DBMS of high school English curriculum and Web.