1.55 $\mu\textrm{m}$ 광증폭기용 Er/Al 첨가 광도파막의 제조

노성인,김재선,정용순,신동욱,송국현 한국세라믹학회 2001 한국세라믹학회지 Vol.38 No.12

본 연구에서는 화염가수분해증착법(Flame Hydrolysis Deposition : FHD)을 이용하여 실리콘(Si)/실리카(SiO$_2$) 광도파막을 제조하고, 이 박막에 Solution Doping 법을 이용해 Er/Al을 복합 첨가하여 광증폭 매질을 제작하는 연구를 수행하였다. 형광 측정을 통해 Al의 복합첨가에 의한 형광효율의 감소 방지 및 형광 스펙트럼의 반치폭 증가를 확인할 수 있었다. 즉, Al가 0.48wt%가 첨가된 경우, Er가 0.14wt% 첨가되는 경우에도 형광세기가 감소하지 않음을 확인하였으며, $1.5mu extrm{m}$ 대역의 형광스펙트럼의 대역폭이 약 5nm 정도 증가됨을 관찰하였다. In this research, the fabrication of Si/SiO$_2$optical waveguide amplifier by FHD(Flame Hydrolysis Deposition) and Solution Doping was carried out. It was observed that the reduction of fluorescence was prevented up to 0.14 wt% Er whn 0.48 wt% Al was doped and the FWHA of $1.5mutextrm{m}$ fluorescence band increased by 5 nm as increasing amount of Al. Therefore from these results, we could confirm depressing concentration quenching of Er ions and increasing FWHM of fluorescence spectrum by addition of Al.

The Effect of the Bowel Preparation Status on the Risk of Missing Polyp and Adenoma during Screening Colonoscopy: A Tandem Colonoscopic Study

홍성노,성인경,김정환,최원혁,Byung Kook Kim,고순영,Jung Hyun Lee,Dong Choon Seol,Su Young Ahn,이선영,박형석,심찬섭 대한소화기내시경학회 2012 Clinical Endoscopy Vol.45 No.4

Background/Aims: Although a small amount of fecal material can obscure significant colorectal lesions, it has not been well documented whether bowel preparation status affects the missing risk of colorectal polyps and adenomas during a colonoscopy. Methods: We prospectively enrolled patients with one to nine colorectal polyps and at least one adenoma of >5 mm in size at the screening colonoscopy. Tandem colonoscopy with polypectomy was carried out within 3 months. Results: A total of 277 patients with 942 polyps and 714 adenomas completed index and tandem examinations. At the index colonoscopy,187 polyps (19.9%) and 127 adenomas (17.8%) were missed. The per-patient miss rate of polyps and adenomas increased significantly as the bowel cleansing rate declined from excellent to poor/inadequate on the Aronchick scale (polyps, p=0.024; adenomas,p=0.040). The patients with poor/inadequate bowel preparation were independently associated with an increased risk of having missed polyps (odds ratio [OR], 3.21; 95% confidence interval [CI], 1.13 to 9.15) or missed adenomas (OR, 3.04; 95% CI, 1.04 to 8.88) compared to the patients with excellent bowel preparation. Conclusions: The risk of missing polyps and adenomas during screening colonoscopy is significantly affected by bowel preparation status. It seems appropriate to shorten the colonoscopy follow-up interval for patients with suboptimal bowel preparation.

사회적 상호 작용을 강조한 초등 생명과학 수업이 초등학생의 자기 효능감과 과학 학업 성취도에 미치는 영향 및 창발성 발현 사례

배진호,노성인,소금현 韓國生物敎育學會 2009 생물교육 Vol.37 No.2

The purpose of this study was to investigate the effects of elementary science learning(life domain) emphasizing social interactions on self-efficacy, science academic achievement and expressions of emergent properties. For this purpose, a total 54 elementary students of two classes of sixth graders, each one as control and experimental groups, were selected. In the control group, traditional textbook-based instruction was implemented and in the experimental group, the elementary science learning emphasizing social interactions within and among the small groups on the same topics was implemented for six weeks. The results were as followed: First, the experimental group showed statistically more significant increase in self-efficacy and science academic achievement than control group. Second, at social interaction stage within and among small groups, the students showed emergent properties. Especially within a small group through free discussion, most of emergent properties were expressed.

The Risk of Metachronous Advanced Colorectal Neoplasia Rises in Parallel with an Increasing Number of High-Risk Findings at Baseline

이승민,김정환,성인경,홍성노 거트앤리버 소화기연관학회협의회 2015 Gut and Liver Vol.9 No.6

Background/Aims: Colorectal adenomas that are ≥10 mm have villous histology or high-grade dysplasia, or that are associated with ≥3 adenomas are considered high-risk for metachronous advanced neoplasia. We evaluated the cumulative incidence of metachronous advanced neoplasia according to the total number of high-risk findings detected on baseline colonoscopy. Methods: This was a retrospective cohort study performed in 862 patients who underwent removal of colorectal adenomas between 2005 and 2009. At least one surveillance colonoscopy had been conducted at Konkuk University Medical Center, Seoul, Korea. Results: The cumulative incidence of metachronous advanced neoplasia in patients with 0, 1, 2, and 3–4 high-risk findings at 1 year were 0.7%, 1.3%, 2.8%, and 8.0%; at 3 years, those were 5.9%, 11.9%, 15.5%, and 24.7%; and at 5 years, those were 8.5%, 18.7%, 26.3%, and 37.2%, respectively. In a multivariate model, the risk of metachronous advanced neoplasia was significantly higher for the multiple high-risk findings group when compared with the 0 high-risk findings group (1 high-risk (+): hazard ratio, 1.86 [95% confidence interval, 1.00–3.44]; 2 high-risk (+): 1.84 [0.88–3.84]; and 3–4 high-risk (+): 3.29 [1.54–7.01]; ptrend=0.020). Conclusions: The presence of overlapping multiple high-risk findings was associated with an increased risk of advanced neoplasia during surveillance.

Early Gstric Cancer-Like Advanced Gastric Cancer versus Advanced Gastric Cancer-Like Early Gastric Cancer

박현식,이선영,홍성노,김정환,성인경,박형석,심찬섭,진춘조 대한소화기내시경학회 2013 Clinical Endoscopy Vol.46 No.2

Background/Aims: Improvements in the endoscopic evaluation and management of gastric cancer have made it possible to determine the depth of invasion during endoscopic examination. The aim of this study was to elucidate the differences between early gastric cancer (EGC) that resembles advanced gastric cancer (AGC) and AGC that resembles EGC. Methods: We retrieved cases of EGC-like AGC and AGC-like EGC from consecutive gastric cancers that had been completely resected. The endoscopic diagnoses and clinicopathological findings were analyzed. Results: AGC-like EGCs were located mainly in the distal part of the stomach, whereas EGC-like AGCs were located mainly in the proximal part of the stomach (p<0.001). Sixty percent of AGC-like EGCs were moderately differentiated adenocarcinomas, while 64% of EGC-like AGCs were poorly differentiated adenocarcinomas (p=0.015). According to Lauren’s classification, 68% of AGC-like EGCs were intestinal type, whereas 71% of EGC-like AGCs were diffuse type (p=0.020). Conclusions: AGC-like EGCs predominate in the distal part of the stomach, while EGC-like AGCs predominate in the proximal part. When evaluating the depth of a gastric cancer, care should be taken not to underestimate measurements in proximal gastric cancers since they tend to be poorly-differentiated adenocarcinomas, in Laurens’s diffuse type, and invade deeper than their endoscopic appearance might suggest.

물류 이송을 위한 딥러닝 기반 특정 사람 추종 모빌리티 제어 연구

유영준,강성훈,김주환,노성인,이기현,이승용,이철희 사단법인 유공압건설기계학회 2023 드라이브·컨트롤 Vol.20 No.4

In recent years, robots have been utilized in various industries to reduce workload and enhance workefficiency. The following mobility offers users convenience by autonomously tracking specific locations and targetswithout the need for additional equipment such as forklifts or carts. In this paper, deep learning techniques wereemployed to recognize individuals and assign each of them a unique identifier to enable the recognition of aspecific person even among multiple individuals. To achieve this, the distance and angle between the robot and thetargeted individual are transmitted to respective controllers. Furthermore, this study explored the controlmethodology for mobility that tracks a specific person, utilizing Simultaneous Localization and Mapping (SLAM)and Proportional-Integral-Derivative (PID) control techniques. In the PID control method, a genetic algorithm isemployed to extract the optimal gain value, subsequently evaluating PID performance through simulation. TheSLAM method involves generating a map by synchronizing data from a 2D LiDAR and a depth camera usingReal-Time Appearance-Based Mapping (RTAB-MAP). Experiments are conducted to compare and analyze theperformance of the two control methods, visualizing the paths of both the human and the following mobility.

초등학생의 생물분류 개념 형성에 대한 연구

배진호,정윤희,배기연,노성인 부산교육대학교 과학교육연구소 2006 科學敎育硏究 Vol.31 No.-

The purpose of this study was to identify the conception and misconception on the biological phylogenetic classification of the elementary students. For this study, the multiple choice and a subjective question of questionnaire consisted of 10 items on the biological phylogenetic classification was developed and administered to 158 elementary students. The results of this study are as follows : They have many trobles in conception of the phylogenetic classification between flowering plants and flowerless plants, dicotyledons and monocotyledons, sympetalous flowers and schizopetalous flowers, complete flowers and incomplete flowers.

uPMU 빅 데이터를 이용한 분석 방안

함정모(J.M. Ham),이경민(K.M. Lee),노성인(S.I. Nho),박건우(K.W. Park),박철원(C.W. Park) 대한전기학회 2022 대한전기학회 학술대회 논문집 Vol.2022 No.7

단일풍선 소장내시경으로 진단된 거대세포바이러스 공장염

이응준 ( Eung Jun Lee ),윤현성 ( Hyun Sung Yoon ),이초이 ( Cho I Lee ),이윤석 ( Yun Serk Lee ),홍성노 ( Sung Noh Hong ),이선영 ( Sun Young Lee ),성인경 ( In Kyung Sung ),심찬섭 ( Chan Sup Shim ) 대한소화기학회 2013 대한소화기학회지 Vol.62 No.4

Cytomegalovirus (CMV) infections are usually diagnosed in immunocompromised patients. A 74-year-old male without any significant medical history visited our center because of abdominal pain and diarrhea which began about a month ago. Abdominal computed tomography revealed segmental enhanced bowel wall thickening on jejunum and single-balloon enteroscopy showed multiple geographic shaped ulcerations covered with exudates on proximal jejunum. Biopsy samples taken during endoscopic examination demonstrated necrotic fibrinopurulent tissue debris and benign ulcer. Nested-PCR analysis of CMV DNA from jejunal tissue was positive. The patient was finally diagnosed with CMV jejunitis and was treated by intravenous ganciclovir for 14 days after which, abdominal pain and diarrhea improved. Our case shows that CMV jejunitis can occur in an immunocompetent adult as multiple jejunal ulcers which can be diagnosed using a single-balloon enteroscope. (Korean J Gastroenterol 2013;62:238-242)

대장직장암의 육안적 소견에 따른 양전자방출단층촬영 섭취율

김소영 ( So Young Kim ),이선영 ( Sun Young Lee ),임화경 ( Hwa Kyung Lim ),이지영 ( Ji Young Lee ),홍성노 ( Sung Noh Hong ),김정환 ( Jeong Hwan Kim ),성인경 ( In Kyung Sung ),박형석 ( Hyung Seok Park ),심찬섭 ( Chan Sup Shim ),진 대한장연구학회 2012 Intestinal Research Vol.10 No.2

Background/Aims: The semiquantitative parameter “standard uptake value” (SUV) of 18Fluorodeoxyglucose (FDG) positron-emission tomography (PET) provides important additional information about colorectal cancer. In general, colorectal cancers exhibit different growth patterns with different clinicopathological characteristics. The aim of this study was to elucidate the link between the macroscopic appearance of colorectal cancers and maximum SUV (SUVmax) FDG uptakes. Methods: We analyzed 347 patients with colorectal cancer who underwent PET scanning before treatment. The SUVmax of colorectal cancer was analyzed by examining PET images. The macroscopic appearance of each colorectal cancer was classified into three major types: ulcerofungating (n=223), ulceroinfiltrating (n=44), and fungating (n=78). Two cases that were difficult to classify were excluded from the study. Results: The SUVmax was higher in colorectal cancers with an ulcerofungating appearance (12.19±5.84, mean±standard deviation) and ulceroinfiltrating appearance (11.66±5.63) than in those with a fungating appearance (9.58±6.67; P=0.005) (ulcerofungating and ulceroinfiltrative vs. fungating, P<0.001). A smaller tumor size (P<0.001) were significantly related to the fungating colorectal cancer. Four out of six colorectal cancers that did not show FDG uptake were the fungating type. Conclusions: Colorectal cancers with a fungating appearance exhibit a lower SUVmax, shallower invasion and smaller tumor size. Our results indicate that colorectal cancers with a fungating appearance would be less prominent on PET scan than those with an ulcerofungating or ulceroinfiltrating appearance, and thus require more attention. (Intest Res 2012;10:168-175)