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청능재활을 위한 AI 기반 음성신호의 특징 추출 및 분석
하승한,이상도 사단법인 한국융합기술연구학회 2023 아시아태평양융합연구교류논문지 Vol.9 No.5
The purpose of this study was to extract and analyze features of speech signals using artificial intelligence techniques, with the goal of improving auditory rehabilitation outcomes. Wav2vec 2.0 was used to identify phonemes in 2,000 sound files recorded from individuals with hearing impairment. The average speech intelligibility score was calculated to be over 0.92 %, determined by calculating the difference between a reference sentence and the sentence obtained through speech-to-text (STT). It was possible to distinguish individual phonemes accurately from recorded sound files of speech produced by individuals with hearing impairments, and to measure the intelligibility of their speech by assessing their speech clarity. Through this experiment, we confirmed the potential to distinguish phonemes between individuals with normal hearing and those with hearing impairment, as long as the phonemes are similar to the reference sentence for individuals with normal hearing. Furthermore, it was confirmed that it is possible to differentiate the accuracy of pronunciation in speech produced by individuals with hearing impairments, which further supports the potential for assessing speech intelligibility in this population through phonetic analysis. To validate the effectiveness of artificial intelligence-based speech signal feature extraction and analysis for auditory rehabilitation, a comparative study on phoneme extraction between individuals with normal hearing and those with hearing impairment should be conducted. 이 연구의 목적은 청능재활을 향상시키기 위해 인공지능 기술을 활용하여 음성 신호의 특징을 추출하고 분석하는 것이다. Wav2vec 2.0을 이용하여 청각장애인 2,000명으로부터 얻은 소리 파일에서 음소를 추출하고 말 명료도를 측정하였다. STT(Speech to Text)로 얻은 문장과 스크립트로 작성된 기준 문장의 차이를 말 명료도로 설정하였으며, 이를 기준으로 계산한 결과 평균 말 명료도 점수는 0.92% 이상이었다. 청각장애인의 발화를 통해 녹음된 소리 파일에서 음소를 정확히 구별할 수 있었으며, 청각장애인의 발화를 통해 녹음된 발음의 정확성을 확인하기 위해 말 명료도를 측정할 수 있었다. 이 실험을 통해, 비장애인의 음소가 기준 문장과 유사하다면 비장애인과 청각장애인 사이에서 음소를 구별할 수 있다는 가능성을 확인하였다. 또한, 청각장애인의 발화에서 발음의 정확성을 구분할 수 있는 가능성도 확인하다. 앞으로 청능재활을 위한 인공지능 기반의 음성 신호 특징 추출 및 분석의 유효성 검증을 위해 비장애인과 청각장애인을 대상으로 음소 추출 비교 연구가 진행되어야 한다.
내시경적 역행성 담관조영술 중에 발생한 식도천공에 의한 기흉 1예
하승인,김신,김유리,박찬복,이지현,윤병철,한병훈,이상욱,신동훈 고신대학교 의학부 2004 高神大學校 醫學部 論文集 Vol.19 No.1
Esophageal perforation is an extremely lethal injury that requires careful management for survival. Currently, the most common cause of the perforation is iatrogenic injury, and the incidence of esophageal perforation has increased as the use of endoscopic procedure has become more frequent. Perforation during endoscopic retrograde cholangiogram (ERC) are rare. Bile duct or duodenal perforation caused by therapeutic procedures such as endoscopic sphincterotomy, guide-wire, and biliary stent were frequently reported. However, the case of esophageal perforation developed during diagnostic ERC was very rare and there has not report in Korea yet. A 61-year-old man was admitted for the evaluation of upper abdominal pain. He suspected bile duct dilatation and common bile duct stone by ultrasongraphy. During the diagnostic ERC, endoscopy showed structure of pleural cavity. We suspected esophageal perforation, and then checked esophagogram, neck and chest CT. The CT showed right side pneumothorax and left parapharyngeal and retropharyngeal air shadow. We diagnosed esophageal perforation accompanied with pneumothorax. He was successfully treated with medical treatment for 10 days.
Gillies 씨 방법으로 정복된 독립 관골궁 골절의 장기 추적관찰
하승일,김준범,최재구,안덕균 大韓成形外科學會 1998 Archives of Plastic Surgery Vol.25 No.1
Many methods have been developed for the reduction of the isolated zygomatic arch fracture. Even though the reduction of isolated zygomatic arch fracture can be made well according to the various methods, the Gillies' method has been selected as the 1st choice. But long term follow-up study of this method was not reported. So long term follow up of zygomatic arch fracture was performed in 35 patients who were treated by Gillies' method. Authors divided isolated zygomatic arch fractures into three classes (Type A : a simple fracture with one fracture line and one greenstick fracture, TyPe B : medially depressed fracture with three fracture lines, Type C : a medially depressed fracture segment with two fracture lines) and followed up the reduced isolated zygomatic arch fracture cases using Gillies' method by radiographes and interview. The depression of lesion site was estimated by comparing with tracing the zygomatic arch shadow of normal side. The results were as follows: 1. The mean follow up time was 33.4 month. 2. The isolated zygomatic fractures were classified by three group. A: a simple fracture (16 cases) B: the central fracture point was a medially depressed fracture (14 cases) C: fracture with a medially depressed segment (5 cases) 3. The mean depression of lesion site was 2.3 mm. (Type A: 2.0 mm, Type B: 3.2 mm, Type C: 2.4 mm and difference between A and B was significant statistically (p < 0.037)). 4. The mean depression of zygomatic arch fracture was 2.1 mm in excellent group, 2.4 mm in good group and 5.2 mm in poor group and difference between excellent and poor, and between good and poor group were statistically significant (p < 0.0001). 5. On result of subjective satisfaction, number of excellent case was 17(48.6%), it of good case was 15(42.9%) and it of poor case was 3(8.6%) (Type A: 9, 7, 0, Type B: 5, 7, 2 and Type C: 3, 1, 1 excellent, good and poor in sequence). 6. The mean depression of overcorrection group(17, 8, 1 excellent good and poor in sequence) and nonovercorrection group(2, 5 and 2 in excellent, good and poor in sequence) was 2.26 and 3.6 mm in each other(p < 0.004). After reviewing all of results, it is concluded that Gillies' method is acceptable as the 1st choice for the reduction method of an isolated zygomatic arch.
간 수술의 병력이 없는 환자에서 발생한 담관 원주 증후군
하승인 ( Seung In Ha ),최정식 ( Jung Sik Choi ),김영훈 ( Young Hoon Kim ),전현수 ( Hyun Soo Jun ),조용건 ( Yong Gun Jo ),이원현 ( Won Hyun Lee ),박성길 ( Seong Gill Park ),이상헌 ( Sang Heon Lee ) 대한소화기학회 2012 대한소화기학회지 Vol.60 No.6
Biliary cast describes the presence of casts within the biliary tree. It is resultant sequel of cholangitis and hepatocyte damage secondary to bile stasis and bile duct injury. Biliary cast syndrome was first reported in patient undergone liver transplantation. The pathogenesis of biliary cast is not clearly identified, but proposed etiologic factors include post-transplant bile duct damage, ischemia, biliary infection, or post-operative biliary drainage tube, Although biliary casts are uncommon, most of biliary cast syndrome are reported in the liver transplant or hepatic surgery patients. A few reports have been published about non-transplant or non-liver surgery biliary cast. We report two cases of biliary cast syndrome in non-liver surgery patients.
Kapok을 template로 이용하여 Porous 유-무기 하이브리드 구조체 합성
하승,박승규 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
나노튜브 분야는 빠른 속도로 성장하는 분야로 튜브의 외부와 내부 벽에 생물학적 접근, 촉매 및 광학 장치의 기능적인 응용이 가능하다. 하지만 가장 큰 문제점으로 제조에 있어서 높은 가격, 어려운 제조 기술, 환경 파괴 문제를 지적 받고 있다. 본 연구는 여타 유기 template에 비해 값이 저렴하며 친환경 자연섬유인 Kapok을 사용하였다. 카폭은 Kapok tree의 열매 속에서 생산되는 천연 섬유로 내부의 wax와 ligolinin층을 제거 하면 hollow한 구조를 갖는다. 카폭의 수 십 μm 크기의 mesopore를 zeolite micro tube 합성의 template로 활용하여 ZSM-5계 제올라이트를 수열합성법으로 합성하여 Kapok표면에 공유결합을 통하여 부착시킨 후 SEM을 통하여 합성된 ZSM-5결정과 Kapok표면에 부착된 ZSM-5결정을 확인하였다.
일반화 가법 모형을 이용한 정책금융 수혜규모가 중소기 업 경영성과에 미치는 효과성 연구
하승인 ( Seungyin Ha ),장명균 ( Myoung Gyun Jang ),이군희 ( Gunhee Lee ) 한국중소기업학회 2017 기업가정신과 벤처연구 Vol.20 No.2
본 연구는 기업의 재무상태 및 지원규모에 따른 정책금융지원의 효과를 파악하기 위하여 일반화가법모형을 적용하여 실증분석 하였다. 이를 위해 이자보상배율과 총자산 대비 신규보증금액 비율을 이용하여 업종별로 분석대상을 구분하였으며, 수익성, 성장성지표를 사용하여 경영성과를 측정하였다. 또한 분석기간에 여러 번의 정책금융을 지원받은 기업의 경우 표본선택편의로 인한 결과의 왜곡이 발생할 수 있으므로 중복지원 효과를 최소화하기 위해 지원연도를 기준으로 이전 3년 동안 보증잔액 및 신규보증이 없으며, 이후 2년동안 신규보증이 없는 기업을 선정하였다. 분석 결과, 보증시점의 이자보상배율이 1 미만이라 하더라도 지원규모에 따라 성과는 차별화되는 것을 확인할 수 있었다. 또한 한계기업의 기준으로 사용되는 이자보상배율이 0에 근사한 기업이더라도 경영성과는 향상될 수 있음을 확인할 수 있다. 결국 본 연구에서는 정책금융 지원정도에 따른 차별적인 경영성과를 확인함으로써 기술력이나 성장 잠재력을 고려한 평가가 요구되며 이를 통해 정책금융을 지원하는 담보가 부족한 중소기업의 자금조달 문제를 완화할 수 있는 유인책으로서의 작용할 수 있음을 시사하고 있다. The aims of this study is to analyze the effectiveness of firms financial status quo and the scale of financial support on SMEs overall performance. We have gathered the financial guarantee data from 1998 to 2013, provided by Korea Credit Guarantee Fund (KODIT), to analyze the effectiveness of Financial policy. To classify both financial status quo and scale of financial support, we utilized the following variables; Interest Coverage Ratio (ICR) and newly guaranteed amount ratio. To take the measurement of the overall performance, we employed profitability, growth ratio and activity index. To minimize the effect of repeated financial support (redundancy benefits), firms were selected based on the following criteria: firms that receive no financial support prior to implementing such policy over the last 3 years and no new financial support over the last 2 years. Results suggest that firms with higher ICR and large newly guaranteed amount influence on financial performance in terms of profitability index. Firms with lower ICR and large scale financial support showed a better performance compare to firms with small-scale financial support. Firms with large-scale financial support, irrespective of ICR inclined to have better performance to those of small-scale financial support in terms of growth index. For activity index, however, firms with large scale support led to higher performance in the short term. In turn, our analysis presents objective perspective with respect to the effectiveness of financial policy through credit guarantee on overall performance of SMEs. This study, therefore, implies that well-balanced SMEs supporting policy may lead to better directions.
내시경적 역행성 담관조영술 중에 발생한 식도천공에 의한 기흉 1예
하승인,김신,김유리,박찬복,이지현,윤병철,한병훈,이상욱,신동훈 고신대학교(의대) 고신대학교 의과대학 학술지 2004 고신대학교 의과대학 학술지 Vol.19 No.1
Esophageal perforation is an extremely lethal injury that requires careful management for survival. Currently, the most common cause of the perforation is iatrogenic injury, and the incidence of esophageal perforation has increased as the use of endoscopic procedure has become more frequent. Perforation during endoscopic retrograde cholangiogram (ERC) are rare. Bile duct or duodenal perforation caused by therapeutic procedures such as endoscopic sphincterotomy, guide-wire, and biliary stent were frequently reported. However, the case of esophageal perforation developed during diagnostic ERC was very rare and there has not report in Korea yet. A 61-year-old man was admitted for the evaluation of upper abdominal pain. He suspected bile duct dilatation and common bile duct stone by ultrasonography. During the diagnostic ERC, endoscopy showed structure of pleural cavity. We suspected esophageal perforation, and then checked retropharyngeal air shadow. We diagnosed esophageal perforation accompanied with pneumothorax. He was successfully treated with medical treatment for 10 days.
하승인,김범석 한국인터넷전자상거래학회 2024 인터넷전자상거래연구 Vol.24 No.1
This study opening a new super store involves selecting an economically feasible location through screening candidate locations and estimating expected sales. Individuals or corprate businesses may have less access to sensitive information than large distribution companies, making it difficult to select an effective location. Accordingly, this study proposed a model that can predict sales of new super stores using easily accessible commercial district information. At this time, the model applied the broken-line regression method to dived the analysis object into two areas before/after the break-point, and separately estimated sales by fitting ridge regression to each area. Through this, it is expected that it will be possible to identify various relationships between sales and influencing factors. As a result of the analysis, a clear difference in relationship between the two areas appeared starting from the break-point, and the sales prediction accuracy through the regression model was also found to be at a good level.