두 점군의 초기 정합에서 GPS와 IMU 센서들의 활용 방법에 대한 연구

고광희 (사)한국CDE학회 2019 한국CAD/CAM학회학회지 Vol.25 No.1

3D 가시화 기술과 활용

고광희 (사)한국CDE학회 2013 한국CAD/CAM학회학회지 Vol.19 No.1

An Exploratory Study on Development for Sustainable Community Enterprise in Jeju

고광희,Yong-Kun Suh 제주대학교 관광과경영경제연구소 2020 産經論集 Vol.40 No.3

Purpose: There have been 1,592 community enterprises(CEs) as of June, 2019 in nationwide since the first case started in 2010 as 184 CEs were designated by the government. However, the majority of CEs has been in management risk due to low investment money and technological capability compared with private companies. Therefore, the purposes of this study were to identify the current situations regarding CEs and to provide managerial implications for securing sustainability and quality growth. Research design, data, and methodology: This study basically went through an exploratory methodology. The study mainly used the secondary data for literature reviews including background, concept, previous studies about development of CEs, and also collected the primary data with interview for some CEs in Jeju from August 2019 to June 2020. Results: There have been 1,592 CEs in nationwide in 2019 since 2010. The largest type was food area including 689 general foods and 224 traditional foods. Diverse areas were recommended including café, child care, financial services, leisure sports, transportation services, library, and teen-ager services such as England. The total of 37 CEs have registered in Jeju since 2010 starting two CEs. 41% was food area but 12 CEs have closed temporarily and 2 have closed completely. Like other regions, diversification of CEs was necessary. In addition, efforts should be made to diversify the types of village enterprises, as in the case of Britain and other countries, which are the origin of village enterprises. Conclusion: First, the re-organization of system relating CEs has needed such as unification of the concept of the ordinance. Second, diversification of CEs has been recommended to promote various types of businesses. Finally, supporting system has needed to re-organize such as implementation of CEs business by JPDC (Jeju Province Development Corporation; local public corporation) and JDC(Jeju Development Center; state-run corporation). Furthermore, in order to increase the value of this research, it is necessary to develop indicators that can guarantee the sustainability of CB through expert surveys(Delphi, FGI, AHP etc.) and make suggestions so that they can come up with support methods and systems suitable for the characteristics of Jeju according to the indicators.

Clinical status and application of cervical spine decision rule for children with neck injury

고광희,정동길,문형준,이동욱,신태용,김현준,이현정 대한응급의학회 2022 대한응급의학회 학술대회초록집 Vol.2022 No.2

Synthesis and Guest Binding Properties of Cyclophanes Containing Two Benzo[b]furan Rings

고광희,Sun-Hyuk Kim,박준우 대한화학회 2004 Bulletin of the Korean Chemical Society Vol.25 No.11

The cyclophanes 1a-d containing two benzo[b]furan rings connected by various bridges have been prepared and their binding behaviors with N-benzylphenethylammonium cation 2 were examined by NMR titration method. The successive alkylation reactions of 4-hydroxyl groups and then 2-hydroxyl groups of 2,4-dihydroxybenzophenonse gave macrocycles 5a-c. Photoirradiation of the macrocycles 5a-c with 350 nm mercury lamp followed by dehydration afforded the cyclophanes 1a-c. Hydrolysis of two ester groups pendant on a bridge of 1b produced the carboxyl group-containing cyclophane 1d. The cyclophane 1a having a p-xylene bridge showed 1 : 1 binding with 2 with the binding constant of 36 ± 6 M−1 in 3 : 1 CDCl3/methanol-d4 solvent, while 1b and 1c which have neutral flexible bridges exhibited no appreciable binding with 2. The disodium salt of 1d showed much higher binding affinity for 2 forming 1 : 1 and 1 : 2 complexes.

소아의 무딘 경추손상에 대한 영상검사 현황 및 임상의사결정규칙 적용

고광희,이현정,김현준,신태용,이동욱,문형준,정동길 대한소아응급의학회 2023 대한소아응급의학회지 Vol.10 No.2

Purpose: We investigated the current status of imaging studies for pediatric blunt cervical spine injury, and applied 3 clinical decision rules to children with blunt trauma of the head or neck in a pediatric emergency center in Korea. The rules included National Emergency X-Radiography Utilization Study (NEXUS) criteria, Canadian Cervical Spine Rule, and Pediatric Emergency Care Applied Research Network risk factors. Methods: This was a retrospective study conducted on 399 children aged 15 years or younger who visited the center after the blunt trauma, and underwent cervical spine radiographs from January 2020 through December 2021. We examined the clinical characteristics per age groups (0-1, 2-5, 6-12, and 13-15 years). Using the 3 rules, we selected children with a potential need for imaging studies (PNI). For this purpose, we analyzed the absence of low-risk variables and the presence of high-risk variables. Predictive performances of the rules were measured for the imaging-confirmed cervical spine injury. Results: The study population (n = 399) had a median age of 5.0 years (interquartile range, 2.0-9.0) and a 64.2% boys’ proportion. Fall (36.6%) was the most common injury mechanism. Two children had the cervical spine injuries. As per NEXUS criteria, Canadian Cervical Spine Rule, and Pediatric Emergency Care Applied Research Network risk factors, 72 (18.0%), 289 (72.4%), and 74 children (18.5%) were classified as those with PNI, respectively. Resultantly, 291 children (72.9%) were classified as having PNI whereas the other 108 (27.1%) were deemed to undergo unnecessary imaging. The 3 rules had nearly 100% sensitivity and negative predictive value, except a 50% sensitivity of NEXUS criteria. Conclusion: Imaging studies can be minimized for children with blunt trauma of the head or neck who are deemed without PNI per the 3 current clinical decision rules. More elaborate criteria are needed to make a timely diagnosis.

구개열(口蓋裂) 환자(患者)에 있어서 구개(口蓋) 성형술후(成形術後) 비인강(鼻咽腔) 폐쇄(閉鎖)에 관(關)한 임상적(臨床的) 연구(硏究)

고광희,신효근,Koh, Kwang-Hee,Shin, Hyo-Keun 대한악안면성형재건외과학회 1992 Maxillofacial Plastic Reconstructive Surgery Vol.14 No.1

In order to find the causes of velopharyngeal incompetency after primary palatorrhaphy in cleft patients, we analyzed the form and function of the velopharyngeal space of fifteen operated cleft palate patients and five normal subjects. The velopharyngeal function was evaluated by lateral cephalometric radiography, velopharyngography and hypernasality cul-de-sac test. The obtained results were as follows. 1. The rate of velopharyngeal incompetency was twenty percent, three of the fifteen operated patients. Two of them were complete cleft palate and the other was incomplete one. 2. The length of soft palate and levator eminence were longer in normal group than those of good speech group and complete cleft palate group during phonation of /i/ (P<0.05). The lengthening rate of soft palate was smaller in good and poor speech group than that of normal group(P<0.05), and, reduced in order, normal group, complete cleft palate group and incomplete palate group(P<0.05). 3. The nasopharyngeal distance had no significant difference between all groups at rest, but, smaller in normal group than that of both cleft palate group(P<0.05), good speech group and poor speech group(P<0.05) during phonation of /i/ The difference in nasopharyngeal distance between rest and /i/ phonation was greater in normal group than that of both cleft palate group, good speech group and poor speech group. 4. The moving distance of sop palate reduced in order, normal group, incomplete cleft palate group, complete cleft palate group(P<0.05). 5. The distance between lateral pharyngeal wall had no significant difference between all groups in rest, but, smaller than that of complete cleft palate group in normal group(P<0.01) and increased in order normal group, good speech group, poor speech group(P<0.01) during phonation of /a/. The mobility of lateral wall was reduced in order, normal group, good speech group poor speech group(P<0. 01). 6. There was low corelationship between the mobility of lateral pharyngeal wall and soft palate. Therfore, it suggest that the movements of lateral pharyngeal wall and soft palate occurs independently.

A Geometric Compression Method Using Dominant Points for Transmission to LEO Satellites

고광희,안효성,왕세명,최수진,정옥철,정대원,박형준 한국항공우주학회 2016 International Journal of Aeronautical and Space Sc Vol.17 No.4

In the operation of a low earth orbit satellite, a series of antenna commands are transmitted from a ground station to the satellite within a visibility window (i.e., the time period for which an antenna of the satellite is visible from the station) and executed to control the antenna. The window is a limited resource where all data transmission is carried out. Therefore, minimizing the transmission time for the antenna commands by reducing the data size is necessary in order to provide more time for the transmission of other data. In this paper, we propose a geometric compression method based on B-spline curve fitting using dominant points in order to compactly represent the antenna commands. We transform the problem of command size reduction into a geometric problem that is relatively easier to deal with. The command data are interpreted as points in a 2D space. The geometric properties of the data distribution are considered to determine the optimal parameters for a curve approximating the data with sufficient accuracy. Experimental results demonstrate that the proposed method is superior to conventional methods currently used in practice.

생산성 향상을 위한 증강현실 기술 적용

고광희 대한인간공학회 2016 대한인간공학회 학술대회논문집 Vol.2016 No.06

가상과 현실의 융합을 위한 프레임워크

고광희,윤동호 (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.8

Augmented reality (AR) is a well-known technology these days and a growing number of AR applications have been introduced. One of the critical problems in AR is how to visualize a virtual object without causing any unnatural feeling when the object or information is augmented in the real world. In particular rendering the object without considering an environment condition fails to give realistic and natural feelings to the viewers. In this paper, we propose a framework for realistic rendering of a virtual object in an AR environment using ray tracing with a single webcam. The framework consists of two steps: one is to obtain information for the environment and light sources from a single webcam by analyzing the input video sequences, and the other is to render objects and shadows using ray tracing based on the environment information for the realistic augmentation of the objects in the real world.