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Hydrogenation on Defect Levels of GaAs Epilayer on Si
배인호,강태원,홍치유,임재영,조성환,장진,이완호,Bae, In-Ho,Kang, Tae-Won,Hong, Chi-Yhou,Leem, Jae-Young,Cho, Sung-Hwan,Jang, Jin,Lee, Wan-Ho The Institute of Electronics and Information Engin 1990 전자공학회논문지 Vol.27 No.1
GaAs epilayer was grown on Si(100) substrate using the two-step growth method by MBE. The crystal growth mode have been investigated by RHEED. The hydrogenation effects of GaAs epilayer were studied by DLTS and Raman spectroscopy. The four electron traps in GaAs/Si layer were observed and their activation energy ranged from 0.47 eV to 0.81 eV below the conduction band. After hydrogenation at 250\ulcorner for 3 hours, new trap not observed and electron traps at Ec-0.68, 0.54 and 0.47 eV were almost passivated. Whereas the Ec-0.81 eV level showed no significant change in concentration. From Raman measurement, GaAs epilayer is found to be influenced by the tensile stress.
Si이 고농도로 첨가된 GaAs의 photoreflectance에 관한 연구
배인호,이정열,김인수,이철욱,최현태,이상윤,한병국,Bae, In-Ho,Lee, Jeong-Yeol,Kim, In-Su,Lee, Cheol-Uk,Choe, Hyeon-Tae,Lee, Sang-Yun,Han, Byeong-Guk 한국재료학회 1994 한국재료학회지 Vol.4 No.6
Si이 고농도로 첨가된 n-GaAs(100)의 Photoreflectance(PR)에 대하여 조사하였다. PR 응답은 변조빔 세기, 변조 주파수 및 온도에 의존함음 알았다. 관측된 Frantz-Keldysh oscillation(FKO)으로 부터, 띠간격 에너지($E_o$)와 표면전장(($E_s$)을 결정하였다. 온도가 상온에서 77K로 감소시킴에 따라, 띠간격 에너지는 증가하는 반면에 , 표면전장은 감소한다. 결정성은 $500^{\circ}C$에서 5분간 열처리후 크게 향상되었다. We have investigated on the photoreflectance(PR) of heavily Si-doped n-GaAs. The PR response was found to be dependent of modulation beam intensity, modulation frequency, and temperature. From the observed Franz-Keldysh oscillation(FKO), we determined the band gap energy and surface electric field. As the temperature is decreased from room temperature to 77K, the band gap energy increases while the surface electric field decreases. The quality of crystal was greatly increased after thermal annealing for 5 min at $500^{\circ}C$.
배인호(In Ho Bae),박희준(Hee June Park),김근효(Geun Hyo Kim),이연우(Yeon Woo Lee),왕수건(Soo Geun Wang),권순복(Soon Bok Kwon) 한국언어치료학회 2016 한국언어치료학회 학술발표대회 논문집 Vol.2016 No.12
Purpose: Diphophonia is generally defined as the perception of two pitch. To evaluate the characteristics of diplophonic voice through direct and indirect methods, we used a multi-channel system. The aim of the study is to compare the sound waveform, electroglottography (EGG), digital kymography (DKG), and two-dimensional digital kymography (2D VKG) characteristics of diplophonic voice at the same time. Second, we tried to compare convenience of discrimination between evaluations methods through reading time required for diplophonia discrimination. Methods: We performed sound waveform, EGG, DKG, 2D DKG test using multi-channel system for 1 normal adult and 14 patients with diplophonic voice (vocal folds palsy, vocal folds polyposis, and muscle tension dystonia). Quasi-periodic perturbation of cycle boundary in sound waveform, quasi-periodic variation in EGG waveform, and metacycle pattern of vocal folds structure in DKG and 2D DKG were compared. And, the read time of three evaluators was measured for each test. Results: First, diplophonia can characterize asymmetric contact of vocal cords, quasi-periodic changes of sound waveform, and metacycle pattern of EGG. Second, the asymmetric vibration patterns of diplophonia can be classified into three types with different frequencies, namely, the left-right vocal folds, anterior-posterior vocal folds, and true-false vocal folds. Third, the reading time was faster in the order of 2D DKG, DKG, EGG and sound waveform. Conclusions: The diplophonia can be classified into three types according to the asymmetric vibration region. Also, 2D DKG using MFES was relatively easy and accurate to evaluate the diplophonia compared to other evaluation methods.
배인호(In Ho Bae),김근효(Geun Hyo Kim),이연우(Yun Woo Lee),박희준(Hee June Park),왕수건(Soo Geun Wang),권순복(Soon Bok Kwon) 한국언어치료학회 2016 한국언어치료학회 학술발표대회 논문집 Vol.2016 No.12
Purpose: Diplophonia defined as the perception of more than one fundamental frequency component in a voice. it can be diagnosed using the auditory perceptual evaluation, voice signals, photoglottography, electroglottography, endoscopic examination using various camera. But auditory perceptual evaluation have limitation of reliability according to validity of intra- inter raters, examination situation, and voice sample. The purpose of this study is to investigate the accuracy of sound waveform analysis and auditory perceptual evaluation, to compare correlation between both methods for verify the efficacy of auditory perceptual evaluation. Methods: Twenty-nine diplophonic voice samples and forty-one nonperiodic voice samples were used in this study. Auditory perceptual judgement and sound waveform analysis for finding of quasi-periodic perturbation were performed. Fisher"s exact test, sensitivity specificity, negative predictive value, positive likelihood Ratio(LR+), negative likelihood Ratio(LR-) were used. Results: The auditory perceptual judgement showed that the sensitivity, specificity, accuracy, LR+, and LR- were 0.9655. 0.9024, 0.9286, 9024, 9.8966, and 0.0382, respectively. The sound waveform analysis showed that sensitivity, specificity, accuracy, LR+, and LR- were 0.9310. 0.9512, 0.9428, 19.0862, and 0.0725, respectively. There was statistically significant correlation between both methods(p<.001). Conclusions: In the discrimination of diplophonia, both methods showed high accuracy and correlation. Although the sound waveform analysis is useful, it is time-consuming task and requires a high degree of concentration until the segment is identified. But the auditory perceptual evaluation is regarded as useful tool for discrimination of diplophonia in clinical practice because it is possible to immediate feedback and have high discrimination accuracy.
호텔조리사의 직무착근도와 자기효능감이 이직의도에 미치는 영향
배인호(In Ho Bae),전진화(Jin Hwa Jun) 한국관광연구학회 2014 관광연구저널 Vol.28 No.9
This study aimed to measure how not only job-related factors from among various influential factors on the turnover of Korean hotel chefs but also how their job embeddedness and self-efficacy involving factors outside the job affect their turnover intention through job satisfaction, organizational commitment, and working attitude, which are job attitudes. It is necessary to promote various goodwill groups at the hotel and to form personal bonding by preparing teamwork for peers at work and a communication system. Self-confidence of self-efficacy was discovered to raise the desire for achievement as a hotel chef and even more to clarify individual faith and conviction for overcoming something that confronts a hotel chef. Also, the sense of challenging to a task was discovered to be effective according to altruism and the effort of an employee. That is, self-confidence helps to achieve the goal of a company by leading to an improvement in job attitude through the sense of challenging to a task, and this may be utilized in policy. The department in charge of hotel human resource management should implement a systematic and innovative human resources management system and manage turnover. It would be possible to prepare relevant plans as well as an effective human resources operation and management system to solve problems and make improvements for a hotel company by reducing turnover after determining the direction for improvement in the future through an identification of problems arising in the food department and an analysis of the cause of turnover intention.
배인호(In Ho Bae),김진동(Jin Dong Kim),권순복(Soon Bok Kwon) 한국언어치료학회 2016 한국언어치료학회 학술발표대회 논문집 Vol.2016 No.12
Purpose: Augmented reality is a concept distinguished from virtual reality, and it is a technology that allows virtual world to overlap and interact with the real world. In the field of speech language therapy, augmented reality is being treated with interest as a new medium to complement the traditional therapy paradigm. The purpose of this study is to investigate the therapeutic effect and interest of home-based auditory rehabilitation program using augmented reality for children with implanted cochlea implant. Methods: We conducted pre-and post evaluation and intervention program for 3 cochlear implant children. We constructed web application and augmented reality contents (3D model, maker) for research purpose and composed search play activity that can be conducted at home. Results were evaluated by auditory perception score of word-level and therapeutic interest. Results: As a results of auditory perception score in pre- and post evaluation, score increased that subject 1 was 25% from 30% to 55%, subject 2 was 40% from 25% to 65%, and subject 3 was from 25% to 75% to 50%. Results of therapeutic interest for 4 weeks showed that subject 1 were 86(89, 92, 79, 84), subject 2 were 93 (98, 102, 91, 81), and subject 3 were 108.25(108, 113, 111, 101). Conclusions: In case of hearing impaired children, the home-based auditory rehabilitation program using augmented reality improved auditory performance. And, therapeutic interest also showed high degree but decreased over time.
코에 발생한 피부 종양의 해부학적 위치에 따른 특성에 관한 후향적 연구
배인호 ( In Ho Bae ),김민성 ( Min Sung Kim ),나찬호 ( Chan Ho Na ),최훈 ( Hoon Choi ),신봉석 ( Bong Seok Shin ) 대한피부과학회 2019 大韓皮膚科學會誌 Vol.57 No.6
Background: The nose plays an important aesthetic, functional role and is located at the center of the face. Due to the characteristics of its anatomical location, the nose is easily exposed and damaged due to weathering, trauma, and inflammation. Objective: This study aimed to provide information on the most common benign and malignant tumors according to their location on the nose. Methods: A retrospective study was conducted on 217 patients who visited the Department of Dermatology at Chosun University Hospital and underwent biopsy for suspected skin tumors in the past 6 years. The tumor was classified as benign, pre-cancerous, and malignant. Differences in the distribution of the anatomical locations of each disease group were analyzed according to the eight anatomical locations of the nose. Results: Based on the external nose anatomy, the most common site where skin tumors usually occurred was the nasal alar (29%), followed by the nasal dorsum and nasal sidewall (23.5% and 20.2%, respectively). The most common skin tumor was malignant tumor (72.3%), followed by benign tumor (21.1%) and premalignant disease (6.4%). Conclusion: I In this study, among patients who underwent biopsy for suspected tumor in the nose, the most common neoplasm was malignant skin tumor and the most common anatomical location was the nasal alar. Therefore, a rapid diagnosis and treatment of skin tumors that occur in the nasal alar wound be necessary. (Korean J Dermatol 2019;57(6):314∼319)