준공 BIM 구축을 위한 Graph-based SLAM 기반의 실내공간 3차원 지도화 연구

정재훈,윤상현,허준,Jung, Jaehoon,Yoon, Sanghyun,Cyrill, Stachniss,Heo, Joon 한국건설관리학회 2016 한국건설관리학회 논문집 Vol.17 No.3

현재 국내 대부분의 토목 건축 구조물이 BIM 정보가 부재한 상황에서 준공 BIM(as-built BIM)의 수요가 점차 증가하고 있다. 준공 BIM 구축을 위한 공간자료 취득에는 고밀도의 포인트 클라우드를 생성할 수 있는 레이저 스캐너가 주로 활용되고 있다. 하지만 기존의 고정식 스캔 시스템은 이동이 번거롭고, 정밀한 위치 선정이 필요 하며, 스캔 자료 정합을 위해 별도의 표지를 설치하거나 공액점을 추출하는 과정이 필요하다. 본 연구에서는 수작업을 최소화하기 위해 기존의 고정식 스캔 시스템을 대체할 수 있는 이동식 스캔 시스템을 제안하고자 하며, 기반 기술로 graph-based SLAM을 적용하였다. 테스트 장비는 총 세 개의 2차원 스캐너를 탑재하고 있으며, 중앙의 한 개는 수평으로 설치되어 graph 구축을 통한 이동경로취득에 사용되었고, 좌우 두 개는 수직으로 설치되어 시스템 진행의 연직 방향으로 주변 구조물에 대한 3차원 스캔 정보 취득에 사용되었다. 개발된 graph-based SLAM은 이동경로 상에 누적된 위치오차를 해소하기 위한 loop closure 처리 방법으로 Adaboost 기계학습을 적용하였다. 이는 특히 본 연구에서 사용한 장비와 같이 기계학습을 위한 다수의 feature 정보를 제공할 수 있는 멀티 스캐너 시스템에 적합한 방식이며, 두 실내공간을 대상으로 한 테스트에서 단일 스캐너 대비 false positive rate를 각각 7.9% 및 13.6%까지 줄일 수 있었다. 최종적으로 연구대상지역의 2차원 및 3차원 지도 구축을 통해 개발된 graph-based SLAM의 효용성을 확인하였다. In Korea, the absence of BIM use in existing civil structures and buildings is driving a demand for as-built BIM. As-built BIMs are often created using laser scanners that provide dense 3D point cloud data. Conventional static laser scanning approaches often suffer from limitations in their operability due to the difficulties in moving the equipment, the selection of scanning location, and the requirement of placing targets or extracting tie points for registration of each scanned point cloud. This paper aims at reducing the manual effort using a kinematic 3D laser scanning system based on graph-based simultaneous localization and mapping (SLAM) for continuous indoor mapping. The robotic platform carries three 2D laser scanners: the front scanner is mounted horizontally to compute the robot's trajectory and to build the SLAM graph; the other two scanners are mounted vertically to scan the profiles of surrounding environments. To reduce the accumulated error in the trajectory of the platform through loop closures, the graph-based SLAM system incorporates AdaBoost loop closure approach, which is particularly suitable for the developed multi-scanner system providing more features than the single-scanner system for training. We implemented the proposed method and evaluated it in two indoor test sites. Our experimental results show that the false positive rate was reduced by 13.6% and 7.9% for the two dataset. Finally, the 2D and 3D mapping results of the two test sites confirmed the effectiveness of the proposed graph-based SLAM.

Fruit Quality of 1-Methylcyclopropene Treated 'Formosa' Plum on the Shelf Life at Ambient Temperature

정재훈,김영칠,정석규,Jung, Jae-Hoon,Kim, Young-Chil,Jung, Seok-Kyu Korean Society of Horticultural Science 2010 원예과학기술지 Vol.28 No.3

The effects of 1-methylcyclopropene (1-MCP) for controlling ripening processes such as weight loss, fruit softening, soluble solids content (SSC), titratable acidity (TA), and fruit skin color were investigated and also the possibility that 1-MCP can inhibit the development of brown rot was explored in 'Formosa' plum ($Prunus$ $domestica$ L.). Fruit were treated with $1{\mu}L{\cdot}L^{-1}$ 1-MCP on the day of harvest and one day after harvest for 16 h at ambient temperature ($20^{\circ}C$), followed by 14 days of shelf life. 1-MCP treatment delayed fruit softening, weight loss and changes in skin color and TA during the shelf life period, but did not affect SSC. These 1-MCP effects were similar with and without delayed treatment. 1-MCP treatment inhibited the development of brown rot caused by $Monilinia$ $laxa$ during storage. Our data shows that treatment delays of ${\geq}1$ day before 1-MCP application had no negative effect of fruit softening, fruit skin color, and TA at ambient temperature ($20^{\circ}C$). Overall, these results indicate that 1-MCP can be used to maintain the quality of non-refrigerated plums. 본 연구는 1-MCP가 'Formosa' 자두의 저장 중 품질 변화와 유통기간 연장에 미치는 효과를 밝히고자 수행하였다. 수확한 'Formosa' 자두를 균일한 크기와 색깔로 선별한 후 수확 당일 그리고 수확 후 1일 후에 걸쳐서 각각 1-MCP를 $1{\mu}L{\cdot}L^{-1}$ 농도로 $20^{\circ}C$에서 16시간 동안 처리하여 대조구(무처리)와 비교하였다. 1-MCP를 처리한 후 14일 동안 상온에서 자두의 연화도, 과중감소율, 가용성고형물 함량 변화, 산도, 그리고 과실의 색깔 변화를 측정하였다. 과중감소율과 과실연화도는 1-MCP 처리구가 무처리구에 비해서 적은 변화폭을 보여주었다. 1-MCP 처리 시기(수확당일 그리고 수확 후 1일) 간에는 따른 큰 차이는 없었다. 가용성고형물 함량에는 통계적 유의성은 없었으나, 1-MCP처리구의 과실에서는 산도와 과실의 색깔 변화가 무처리구에 비해서 적게 나타났다. 또한 1-MCP는 저장 중에 발생하는 과실의 부패병 억제효과를 나타내었다. 따라서 본 연구결과, 1-MCP 처리시기(${\geq}1$일) 연장은 상온저장시 과실의 경도, 산도, 과일 색깔 변화에 큰 영향을 미치지 않았으며, 또한 과실품질 유지에 실용성이 있는 결과를 보여주었다.

거대 분자운의 원적외선 특성

정재훈,김현구,김봉규,Jung, Jae-Hoon,Kim, Hyun-Goo,Kim, Bong-Gyu 한국천문학회 2006 天文學論叢 Vol.21 No.2

Infrared color-color diagram of 10 giant molecular clouds are examined to explore the dust property from the COBE Diffuse Infrared Background Experiment of the 100, 140, and $240{\mu}m$ emission. Four of them, Taurus, Mon OB1, Gem OB1, and Chameleon, show the anti-correlation in $R_{100/140}-R_{140/240}$ plot and the horizontal distribution in $R_{100/240}-R_{140/240}$ plot, which disagree with those of theoretical calculation. These could be explained by the depletion of $100{\mu}m$ and the excess of $140{\mu}m$ emission, though no existing dust model could support them. Mean color temperature of the anti-correlation region appears to be lower than that of the linear region, whose temperatures are 15.3, 17.0 K, respectively. And the linear region shows large dispersion in the plot of intensity relation. Both imply that a star formation would be more active, but not homogeneous, in the linear region compared to the anti-correlation region.

혁신형 중소기업의 조직혁신역량이 기업의 수출성과에 미치는 영향

정재훈,오가영,Jung, Jae Hoon,Oh, Ka Young 강원대학교 경영경제연구소 2022 Asia-Pacific Journal of Business Vol.13 No.3

Purpose - This study investigate the effect of innovative capacity on corporate export performance and moderating flexibility. Design/methodology/approach - For this, hypotheses were established by reviewing previous studies and an empirical analysis was conducted for testing. Using SPSS 22.0, a frequency analysis of related variables was conducted. Through an exploratory factor analysis, validity and reliability tests of measuring tools were conducted and a descriptive statistics was analyzed for collected data result and hypotheses testing. Findings - Finally, with a verified model, the hypotheses and the moderating effects were tested. The results are as follows; The innovationa capacities have a positive effect on export performance and flexibility However, the flexbilitiy was not moderator in the relationship between innovative capacity and export performance. Research implications or Originality - According to the results above, this study presents directions to improve export performance of technological innovative type SMEs. The innovative capabilities, marketing capacity, organization innovative capacity and process innovative capactity, has an positive effect on

고관절 주위 골절환자에서 술 전 색 도플러 초음파를 이용하여 진단한 심부 정맥 혈전의 빈도

정재훈,이경재,민병우,손은석,구태원,Jung, Jae-Hoon,Lee, Kyung-Jae,Min, Byung-Woo,Son, Eun-Seok,Koo, Tae-Won 대한정형외과초음파학회 2014 대한정형외과 초음파학회지 Vol.7 No.2

목적: 고관절 주위 골절 환자에서 술 전 색 도플러 초음파 검사를 이용하여 심부 정맥 혈전증을 진단하고 그 발생 빈도를 알아 보고자 하였다. 대상 및 방법: 2013년 6월부터 2014년 5월까지 본원에 내원한 고관절 주위 골절 환자 중 이전에 심부 정맥 혈전의 과거력이 없으며 술 전 색 도플러 초음파 검사에 동의한 환자 27예를 대상으로 하였으며 남자가 8예, 여자가 19예이었다. 평균 연령은 74.3세(41-87)였다. 고관절 주위 골절의 진단명은 대퇴 경부 골절 15예, 대퇴 전자간 골절 11예, 비구 골절이 1예였다. 모든 수술은 본원 내원 후 48시간 이내에 시행하는 것을 원칙으로 하였으며 내원 24시간 이내에 색 도플러 초음파 검사를 시행하였다. 결과: 심부 정맥 혈전은 총 6예(22.2%)에서 발견되었다. 이중 2예(7.4%)는 근위 심부 정맥 혈전이었고 4예(14.8%)는 원위 심부 정맥 혈전이었다. 심부 정맥 혈전 발생 군이 평균 79세(75-87), 발생하지 않은 환자 군이 평균 72세(65-86)로 유의하게 많았다(p=0.038). 결론: 고관절 주위 골절 환자에게 수술 이전 실시한 색 도플러 초음파 검사상 22.2%로 비교적 높은 빈도로 심부 정맥 혈전이 발견되었다. 고관절 주위 골절 환자에서 술 전 심부 정맥 혈전증에 대한 보다 적극적인 검사가 필요할 것으로 사료된다. Purpose: To evaluate the incidence of deep vein thrombosis (DVT) before hip fracture by duplex color Doppler ultrasonography. Materials and Methods: From June 2013 to May 2014, 27 patients who had agreed to perform color Doppler ultrasonography before hip fracture surgery were evaluated for the incidence of DVT. Patients who had history of DVT were excluded. Five patients were men and 19 patients were women. The mean age was 74.3 years old (41-87). There were 15 cases of femoral neck fracture, 11 cases of intertrochanteric fractures and one case of acetabular fracture. Surgical intervention underwent within 48 hours from admission and duplex color Doppler ultrasonography was carried out at the day of admission. Results: DVT occurred in six cases (22.2%). Four cases (14.8%) occurred in proximal deep vein and two cases (7.4%) occurred in distal deep vein. The mean period of immobilization was longer in patients who had DVT. But there was no significant difference. The mean age was 79 years old (75-87) in patients who had DVT and 72 years old (65-86) in patients who had not. There was significant difference (p=0.038). Conclusion: The incidence of DVT which was diagnosed by duplex color Doppler ultrasonography before hip fracture surgery was relatively high (22.2%). So it is necessary to undergo duplex color Doppler ultrasonography more aggressively to rule out DVT before hip fracture surgery.

안와 상벽 골절과 광대뼈 골절의 임상 양상과 치료 및 동반된 안과적 진단

정재훈,이화,이종미,백세현,Jae Hoon Jung,Hwa Lee,Jongmi Lee,Sehyun Baek 대한안과학회 2012 대한안과학회지 Vol.53 No.4

Purpose: To investigate the clinical manifestations, management, and ophthalmologic complications of orbital roof fractures and zygoma fractures. Methods: A retrospective survey of 119 patients who visited Korea University Medical Center from June 2009 to June 2010 was performed. The sex, age, causes, fracture characteristics, neurologic injury, ocular injury, and combined facial bone fractures of patients who were diagnosed with orbital roof fracture and zygoma fracture were statistically analyzed. Results: The mean age of patients with orbital roof fracture was 33.0 years old. The most common cause of orbital roof fracture was traffic accident (36.1%) with 6 patients receiveing surgical treatement (9.8%). Among the ophthalmologic diagnoses of the patients with orbital roof fracture, traumatic iridocyclitis was the most common (7 eyes) followed by eyeball rupture (2 eyes). The mean age of patients with zygoma fracture was 36.6 years old. The most common cause of zygoma fracture was traffic accident (32.8%), with 51 patients receiving surgical treatement (87.9%). Among the ophthalmologic diagnoses of the patients with zygoma fracture, traumatic iridocyclitis was the most common (6 eyes), followed by commotio retina (4 eyes). Conclusions: The present study regarding clinical characteristics and treatment of orbital roof fracture and zygoma fracture is helpful for ophthalmologists regarding the treatment of accompanying ophthalmologic complications. J Korean Ophthalmol Soc 2012;53(4):577-581

정상배란성 월경주기에서 혈청 인슐린유사 성장인자 결합단백질의 양상

정재훈,김정구,Jeong, Jae-Hoon,Kim, Jung-Gu 대한생식의학회 1999 Clinical and Experimental Reproductive Medicine Vol.26 No.1

The insulin-like growth factor (IGF)s are believed to one of several growth factors that play an adjunctive role in ovarian follicular development. These factors circulate bound to a family of IGF-binding protein (IGFBP)s. It is known that circulating IGFBPs are involved in the transport of IGFs to tissues and modulate IGFs actions at local tissue. The purposes of this study were to evaluate changes in serum IGFBPs profiles during normal ovulatory menstrual cylce and to compare serum IGFBPs profiles in periovulatory phase of between normal ovulatory menstrual cylce and controlled hyperstimulated cycle. Fasting blood samples were obtained from 15 normal healthy women throughout normal ovulatory menstural cyle and on the day of aspiration of oocyte from 10 patients undergoing ovarian hyperstimuation for in vito fertilization-embryo transfer. Serum IGFBP-1 - IGFBP-4 were measured by western ligand blot and immunoprecipitation. Serum $17{\beta}$-estradiol was determined by radioimmunoassay. Type and molecular weight of serum IGFBP did not changed during normal ovulatory menstural cycle. No significant variation in the relative proportion and level of each IGFBP was found throughout normal ovulatory menstural cyle. Also, the relative proportion and level of each IGFBP did not correlated with serum $17{\beta}$-estradiol level. There was no significant difference in the relative proportion and level of each serum IGFBP between on the day of ovulation in normal ovulatory menstrual cylce and on the day of aspiration of oocyte in controlled hyperstimulated cycle. Our data indicate that IGFBPs have regulatory functions in ovary through an paracrine and autocrine rather than endocrine mechanism during normal ovulatory menstural cycle.

단일 광섬유 브래그 격자와 EDFA를 이용한 온도와 스트레인의 동시 측정

정재훈,남희,이병호,Jung, Jae-Hoon,Nam, Hui,Lee, Byoung-Ho 대한전자공학회 1999 電子工學會論文誌, D Vol.d36 No.6

We propose and demonstrate a novel sensor which can simultaneously measure strain and temperature. The sensor is composed of a single fiber Bragg grating and an erbium-doped fiber amplifier. Using linear variation in the amplified spontaneous emission power of an erbium-doped fiber amplifier with temperature, we determine the temperature. By subtracting the temperature effect from the Bragg wavelength shift, we determine the strain. Experiments show rms deviations of $18.2{\mu}{\varepsilon}$ and $0.7^{\circ}C$ for strain and temperature, respectively. 하나의 광섬유 브래그 격자와 EDFA를 이용하여 온도와 스트레인을 동시에 측정할 수 있는 센서를 제안하고 구현하였다. 혼도에 따른 EDFA 의 ASE파워의 선형적 변화를 이용하여 온도를 측정하고 전체 브래그 파장변화와 그 온도효과의 차로써 스트레인을 측정하였다. 측정값은 스트레인과 온도 각각에 대해서 $18.2{\mu}{\varepsilon}$과 $0.7^{\circ}C$의 rms 오차를 가진다.

Arrayed Waveguide Grating의 스펙트럼해석

정재훈,Jung, Jae-Hoon 한국전기전자학회 2004 전기전자학회논문지 Vol.8 No.1

Arrayed waveguide grating의 스펙트럼을 해석하기 위해 Fresnel Kirchhoff diffraction 식과 Fraunhofer diffraction 근사식을 이용하여 실제로 제작되는 16채널 및 40채널의 arrayed waveguide grating에 대해 적용해 보았으며 Fraunhofer diffraction 근사식을 적용할 때 생기는 문제점을 모델별로 도출하였고 그 오차를 실제의 공정오차와 비교하였다. We performed the spectrum analysis of arrayed waveguide grating using Fresnel Kirchhoff diffraction formula and its approximated Fraunhofer diffraction equation and applied both methods to 16 channel and 40 channel models. We presented the spectra and found out the limitations of Fraunhofer diffraction in analysis of arrayed waveguide grating and compared the errors coming from Fraunhofer diffraction approximation and due to imperfection during the fabrication process.

국내 치매환자의 인지기능 향상을 위한 중재의 효과: 무작위 대조군 실험연구의 체계적 문헌고찰

정재훈,Jung, Jae-Hun 대한산업경영학회 2021 산업융합연구 Vol.19 No.5

본 연구는 국내 치매환자의 인지기능 향상을 위한 중재에 대한 특성과 효과를 분석하기 위해 무작위 대조군 실험연구에 대한 체계적 고찰을 시행하였다. 5개의 검색 데이터베이스를 사용하여 2010년 1월부터 2021년 6월까지 발표된 연구를 분석하였다. 총 1,104편의 연구가 검색되어 총 27편의 연구를 최종 분석하였다. 문헌의 질 평가는 Risk of bias(RoB)를 사용하였다. 인지기능 평가도구는 Mini-Mental Status Examination(MMSE)이 가장 많이 사용되었다. 인지기능 중재는 운동치료, 미술치료, 인지자극, 회상치료, 음악치료, 복합인지재활, 가상현실, 원예치료, 컴퓨터기반 인지훈련, 의도적 다감각자극, 미용치료, 요리활동, 한국적 익숙함이 적용되었다. 운동치료 2편, 가상현실 1편, 미용치료 1편을 제외하고 모든 연구에서 인지기능에 유의한 향상이 나타났다. 본 연구는 국내 치매환자의 인지기능에 대한 중재를 계획하고 실행하는데 임상적 근거를 제시하였다. 향후에는 연구방법의 질적 향상으로 체계적이고 치매의 특성에 맞는 다양한 중재 연구가 이루어져야 할 것이다. The purpose of this study was to systematically review about randomized controlled trials the characteristics and effect of cognitive function intervention for patient with dementia. We searched studies published from January 2010 to June 2021 in 5 databases. A total 1,104 studies were found and included 27 studies in final analysis. Methodological quality was assessment with the Cochrane's RoB(risk of bias) tool. Mini-Mental State Examination(MMSE) was the most used as the assessment tool for identifying the cognitive function. Cognitive function intervention were exercise, art, cognitive stimulation, reminiscence, music, multimodal cognitive rehabilitation, virtual reality, horticultural, computerized cognitive training, intentional snoezelen, beauty, cooking, korean traditional familiarity program. Most of the intervention except exercise 2, virtual reality 1, beauty 1 were effective in improving cognitive function. This study provided a clinical evidence for planning and implementing intervention for cognitive function intervention. In the future, various intervention studies suitable for the characteristics of dementia should be conducted by improving the quality of research methods.