미세피판기법을 이용한 성대낭종제거술

안정민,최지은,이동근,장전엽,손영익,Ahn, Jungmin,Choi, Ji-Eun,Lee, Dong Kun,Jang, Jeon Yeob,Son, Young-Ik 대한후두음성언어의학회 2016 대한후두음성언어의학회지 Vol.27 No.1

Background and Objectives : Microsurgical resection of intracordal cysts is technically difficult and challenging because the wall of cysts may be tightly attached to underlying vocal ligament and/or overlying epithelium, and therefore their thin wall will easily rupture during surgical dissection. We aimed to evaluate the voice outcomes of standard microflap subepithelial resection and the recurrence rate depending on the intraoperative rupturing of the cyst. Materials and Methods : Medical records of Samsung Medical Center, Seoul, Korea, were reviewed for sixty-four consecutive patients who received surgical resection of vocal cyst using microflap subepithelial dissection technique between the year 2004 and 2013. Meticulous dissection was performed to completely remove the cyst wall while preserving the mucosa and the lamina propria as much as possible. Voice outcomes and recurrence rates were compared according to the type, size and the intraoperative rupture of cyst. Results : Presence or absence of cyst rupture was clearly described in the operation records of 41 patients. Intraoperative rupture of the cyst occurred in 32 of 41 (78%) patients. The recurrence was detected in 5 of 64 (7.8%) total cases and 4 of 32 (12.5%) cases of ruptured cyst, but not in 9 cases of intact extirpation. Rupture was more common in case of mucous retention cyst compared with epidermoid cyst (p=0.036). Subjective and objective voice parameters were measured at before and 3 months after surgery, which improved regardless of the cyst rupture. Conclusion : Although complete microsurgical extirpation of intracordal cyst while keeping the cyst wall intact is technically difficult, meticulous dissection with maximal preservation of surrounding tissue may warrant the improvement of voice outcomes.

백천 유역 토지피복 변경에 따른 비점오염 저감효과 분석

안정민 ( Jungmin Ahn ),양득석 ( Dukseok Yang ),신동석 ( Dongseok Shin ),이인정 ( Injung Lee ) 한국농공학회 2016 한국농공학회 학술대회초록집 Vol.2016 No.-

Baekcheon watershed, which is mostly consists of rice paddies and fields, is expected to be higher non-point source pollution impacts. The effect of the non-point source pollution appears fairly large in the tributaries because tributaries are within close proximity to pollution sources unlike the mainstream and the flow rate of tributaries is insufficient. The developed model based on Fortran was applied using input data derived by ARC-GIS in order to analysis quantitatively for the direct runoff and the non-point source pollution load. As a result of the application, we found the contribution rate and the reduction rate for non-point source loading according to change of landuse.

양측 급성 음향외상의 임상양상 및 치료결과의 개인별 이질성

안정민 ( Jungmin Ahn ),한지혁 ( Ji Hyuk Han ),배문정 ( Mun Jung Bae ) 국군의무사령부 2020 대한군진의학학술지 Vol.51 No.1

Objective: To analyze individual heterogeneity in susceptibility to noise using within-subject comparison of hearing outcomes following medical therapy for bilateral acute acoustic trauma (AAT). Method: Twelve patients with bilateral hearing loss after gunshot noise exposure during military training were enrolled. Pure tone audiometry, to measure pure-tone averages (PTA) at 2000, 4.000, and 8000 Hz, was performed in all patients at their initial visit and one month after treatment with oral corticosteroids. Results: The initial mean hearing level was 46.67 ± 12.0 dB for the right ear, 52.92 ± 11.15 dB for the left, and 49.79 ± 11.77 dB for both ears. In the 1-month follow-up, the mean PTA was 35.42 ± 15.19 dB for the right ear, 43.06 ± 15.92 dB for the left, and 39.24 ± 15.71 dB for both ears. The difference in PTA between the right and left ears during the initial visit was markedly correlated with the difference in PTA between both ears during the 1-month follow-up (rho = 0.814, р = 0.001). In addition, the average hearing gain on the right side showed a strong correlation with that on the left side (rho = 0.736, p = 0.006). However, there was no relationship between the initial hearing threshold and the degree of hearing gain when both ears were considered together. Conclusion: We detected the positive effects of steroid treatment for AAT and demonstrated clinical evidence of individual susceptibility to acoustic trauma.

GSTARS모형을 이용한 형산강의 최적 유사량공식 결정

안정민(Ahn Jungmin),류시완(Lyu Siwan),이남주(Lee Nam Joo) 대한토목학회 2012 대한토목학회논문집 B Vol.32 No.1B

본 연구에서는 준 2차원 수치모형인 GSTARS를 이용하여 형산강의 하상변동모의에 적합한 최적 유사량공식을 산정하고자 하였다. 모형의 검보정을 위한 유사량, 하상재료 및 하천지형자료를 현장조사를 통해 취득하였다. 현재까지 널리 적용되는 유사량 공식들에 대하여 장기하상변동 모의결과의 실측치에 대한 평균오차, 상대오차, 평균제곱오차, 상대제곱근오차, 불일치율, 그리고 Nash-Sutcliffe 효율계수를 비교한 결과, Laursen(1968)공식이 형산강의 장기하상 변동을 모의하기 위한 가장 적합한 유사량공식으로 판단되었다. Quasi-two dimensional numerical model (GSTARS) was applied to determine the optimal sediment discharge formula for simulating the sedimentologic characteristics of Hyeongsan river. The field measurements have been conducted to obtain the data, such as sediment discharge, bed material, and channel geometry, for model calibration and verification. The sediment discharge formulas, which have been generally used, have been assessed according to the average error, relative error, RMSE, RRMSE, discrepancy ratio and Nash-Sutcliffe efficiency coefficient for bed changes along the thalweg. From the results, Laursen formula(1968) shows the best performance to simulate the long-term bed change of Hyeongsan river.

하천 퇴적물 내 중금속 오염도 평가에 관한 연구 (낙동강 수계 표층 퇴적물을 대상으로)

김신,안정민,정강영,이권철,권헌각,신동석,양득석,Kim, Shin,Ahn, Jungmin,Jung, Kangyoung,Lee, Kwonchul,Kwon, Heongak,Shin, Dongseok,Yang, Deukseok 한국물환경학회 2017 한국물환경학회지 Vol.33 No.4

In order to certificate the contamination assessment of heavy metals in surface sediments from the Nakdong river. Surface sediments were collected of 24 sampling sites (main 14st., tributary 10st.) and analyzed for grain size heavy metals contents. Study area mainly composed of sand (avg. 94.1%) and mean grain size was $1.46{\Phi}$ on average. Heavy metals contents (avg. Al: 12.5%, Zn; 74.4, Cr: 45.3, Li: 26.0, Pb: 17.1, Ni: 10.5, Cu: 7.8, Cd: 0.22 mg/kg) were relatively high contents in the composed of fine sediments. In addition, the results of pearson's correlation coefficient showed that most heavy metals and grain size (silt and clay) were highly correlated. The contents of Zn (6st.) and Ni (1st.) evaluated as moderately polluted, Zn (6st.) evaluated as LEL when compared with sediment quality standard of USEPA and Ontario sediment quality guidelines. Most heavy metals contents were I levels that dose not affected the benthos when compared with sediment pollution evaluation standard of NIER. The results of EX, EF, Igeo and CF showed the contents of Zn, Pb and Cd exceed the background contents and distributing of anthropogenic pollution and evaluated as moderately polluted level. And Nm-08 were relatively high level of contamination in the study area. However as results of PLI (less than 1), all sampling sites were evaluated unpolluted level.

부모의 학대가 아동의 우울과 신체화 증상에 미치는 영향

박준성 ( Junseong Park ),안정민 ( Jungmin Ahn ),정태연 ( Taeyun Jung ) 국민대학교 사회과학연구소 2019 社會科學硏究 Vol.31 No.2

본 연구는 부모의 학대가 아동의 우울과 신체화 증상에 미치는 영향을 연구하였다. 이러한 연구 목적을 달성하기 위해서 한국아동·청소년패널조사(Korea Children Youth Panel Survey: KCYPS)의 자료 중 초등학교 1학년 학생의 2차년도 2011년, 4차년도 2013년, 6차년도 2015년 자료를 대상으로 연구를 실시하였다. 본 연구에 참여한 대상은 초 1패널 2차년도, 4차년도, 6차년도 연속적으로 성실히 문항에 응답한 학생 1,816명(남자 938명(51.7%), 여자가 878명(48.3%))을 대상으로 연구하였다. 본 연구는 첫째, 인구통계학적으로 학대, 우울 그리고 신체화 증상에서 성차가 있는지 분석하였다. 그 다음 부모의 학대가 우울 그리고 신체화 증상에 미치는 영향을 검증하기 위해서 구조방정식을 사용하여 모형검증을 실시하였다. 그 결과를 살펴보면, 차이검증에서 학대에서는 2차년도, 4차년도, 6차년도에서 남아가 여아에 비해 통계적으로 유의미한 차이가 검증되어 남아가 여아에 비해 학대를 높게 인식함을 알 수 있었다. 우울에서는 6차 년도에서 통계적으로 유의미한 차이가 검증되어 여아가 남아에 비해 우울을 높게 인식하고 있었다. 본 연구에 대해 구조방정식 모형 검증한 결과를 살펴보면, 첫째, 이전 학대는 이후 학대에 통계적으로 유의미한 영향을 미치고 있었고 학대는 우울에 통계적으로 유의미한 영향을 미치고 있었으며 이전 우울은 이후 우울에 통계적으로 유의미한 영향을 미치고 있었다. 둘째, 부모의 학대와 우울은 아동의 신체화 증상에 통계적으로 유의미한 영향을 미치고 있었다. 마지막으로 구조방정식 모형검증에서 남아와 여아의 중요한 차이는 학대3에서 신체화증상으로의 경로였다. 이러한 결과를 토대로 우리 사회에서 부모의 학대가 아동의 우울과 신체화 증상에 미치는 영향에 대해서 논의하였다. This study examined the effects of parental persistence on depression and somatic symptoms in children. In order to achieve these objectives, the data of the first year elementary school students of the Korea Children Youth Panel Survey(used 2nd year 2011 data, 4th year 2013 data, 6th year 2015 year data) were studied. The subjects who participated in this study were 1,816 students who participated in the 2nd, 4th and 6th years, 938 (51.7%) were boys and 878 (48.3%) were girls. First, we analyzed the gender differences in abuse, depression, and somatic symptoms. We then conducted a verification of model using structural equation model to analyze the effects of parental abuse on depression and somatic symptoms. The results showed that boys in the second year, fourth year and sixth year of maltreatment showed a statistically significant difference in boys compared to girls. In the sixth year of depression, statistically significant differences were verified. Girls were more likely to be depressed than boys. Statistically significant differences were also observed in somatic symptoms in the 6th year. Girls were more likely to be depressed than boys. Second, persistent abuse and depression had a statistically significant effect on child's somatic symptoms. Finally, in the structural equation model analyzed, an important difference between boys and girls was the path from abuse3 to somatization symptoms. Based on these results, we discussed the effects of parents persistent abuse on children's depression and somatic symptoms.

Development of a Tendon-driven Exo suit for Upper Limb Exercise

Doheyon Pyeon(편도현),Jungmin Ahn(안정민),Sangheui Cheon(천상희),Kuyul Jeong(정구열),Kyujin Cho(조규진) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.4

텍스트 빅데이터 분석을 통한 한국인의 불공정 경험 분석: 국민청원 게시판 데이터 분석 결과를 중심으로

양혜진 ( Hyejin Yang ),안정민 ( Jungmin Ahn ),이태헌 ( Taehun Lee ) 한국조사연구학회 2021 조사연구 Vol.22 No.1

본 연구는 토픽 모델링과 질적 텍스트 분석을 통합적으로 활용하여 청와대의 국민청원 게시판 텍스트 데이터를 분석함으로써 한국인의 불공정 경험과 인식을 탐색하고자 하였다. 전체 청원 중 하루에 적어도 30개 이상의 동의를 받은 6,084개를 대상으로, 토픽 모델링 방법 중 하나인 잠재 디리클레 할당(Latent Dirichlet Allocation; LDA)을 활용하여 주요 토픽을 추출하고 각 토픽별 대표문서를 추출하였다. 이 과정에서 양적 기준뿐만 아니라, 질적 분석결과를 통합적으로 반영하여 최종적으로 28개의 토픽을 결정하였다. LDA를 통해 얻은 토픽별 출현확률이 높았던 단어 15개와 토픽의 언급 순위와 대표문서를 질적 분석한 내용에 따라 한국인의 불공정 경험 및 인식에 대한 몇 가지 특성을 발견하였다. 본 연구는 효과적인 텍스트 빅데이터 분석을 위해 토픽 모델링과 질적 분석을 유기적으로 통합한 혼합 방법을 사용하였다는 점, 분석 결과를 바탕으로 한국인의 공정성 경험 및 인식의 특성과 후속 연구의 방향을 제안하였다는 점에서 의의를 가진다. This study investigated experiences and perceptions of unfairness for Koreans by analyzing texts posted on the Blue House National Petition through a combination of topic modeling and qualitative text analysis. Specifically, we applied Latent Dirichlet Allocation (LDA) and extracted latent topics and representative documents per topic from a total of 6,084 petitions that received at least thirty consents per day. A total of twenty eight topics were chosen for final interpretations based on the results from both qualitative and quantitative criteria. The analysis of keywords and representative documents per topic revealed important characteristics regarding Koreans' experiences and perceptions of unfairness. Unique contributions of this study can be summarized as follows: a strategy for effectively examining text big-data or a mixed method of topic modeling and qualitative analysis was proposed and profitably applied to find out characteristics of unfair experiences among Koreans, providing new directions for follow-up research.

낙동·고령 중권역의 표층 퇴적물 입도 조성 및 유기물질 분포 특성 변화

김신 ( Shin Kim ),안정민 ( Jungmin Ahn ),김형근 ( Hyounggeun Kim ),권헌각 ( Heongak Kwon ),김경훈 ( Gyeonghoon Kim ),신동석 ( Dongseok Shin ),양득석 ( Deukseok Yang ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.6

To investigate the distribution characteristics of grain size and organic matter of surface sediments from the Nakdong-Goryeong Mid-watershed, surface sediments were collected and analyzed. The samples were collected from six sited at four different times between May 2013 and May 2014. The were analyzed for grain size, water content, ignition loss, chemical oxygen demand, total organic carbon and total nitrogen. The surface sediments were mainly composed of medium sand (mean 44.7%) and coarse sand (mean 32.8%) and became coarser in May 2014. Fine sediments at the site NG-2 were poorly sorted and positively skewed, and occur in a tributary environment that is relatively low-energy compared with the other sites. The water content at the studied sites (15.3 ~ 34.9%) averaged 20.25%, and ignition loss (0.4 ~ 5.8%) and total nitrogen (274 ~ 2493 mg/kg) averaged 1.33% and, 696 mg/kg, respectively. These values indicated that the sediments were not seriously contaminated when compared with the sediment pollution evaluation standard of the National Institute of Environmental Research. The chemical oxygen demand (mean 0.17%) was at the non-polluted level compared with United States Environmental Protection Agency sediment quality standards. The total organic carbon (mean 0.18%) at all sites except site NG-2 (lowest effect level) was the no effect level of the Ontario sediment quality guidelines. The COD/IL (0.02 ~ 0.20) and C/N (0.73 ~ 6.76) were less than 1 and 10, respectively. Organic matter in the study area produced naturally from aquatic organisms. Results of principal component analysis showed that fine sediments (very fine sand and silt) were significantly affected by organic matters (ignition loss, chemical oxygen demand, total organic carbon and total nitrogen). In addition, the highest organic matters content in the study area occurred at the site with the finest sediments (NG-2).

반도체 공정 유해가스 저감을 위한 저온 플라즈마 연소 장치의 성능시험

김태형(Taehyung Kim),이세창(Sechang Lee),김정태(Jeongtae Kim),남윤걸(Yungeol Nam),안정민(Jungmin Ahn) 한국에너지학회 2023 한국에너지공학회 학술발표회 Vol.2023 No.4