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충주 지역에서 10년간 급성심근경색의 임상관찰에 대한 연구
박봉안,류하근,이종혁,김인숙,류주성,유재등,이용구,문언수,김형수 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-
Background: The current treatments of acute myocardial infarct(AMI) Include noninvasive method using thrombolytics and invasive methods such as primary percutaneous transluminal coronary angioplasty(PTCA) and coronary artery bypass graft(CABG)surgery. Although there are many studies comparing the effectiveness of noninvasive and invasive methods, when large clinical centers, 20% of totar hospitals, were excluded, most middle-sized hospitals lacked personnels and facilities for the invasive methods. Thus they opted for the noninvasive methods. Therefore, in this study, the clinical characteristics of AMI patients and the results of thrombolytic & conservative treatment were observed. Method: 137 patients with acute myocardial infarct, who visited KonKuk University Medical Center, ChoongJu Hospital during Sept. 1990 to Sept. 1999 were analysed retrospectively using medical records. Result: The sexual compositions of patients were 63.5% male, and 36.5% female. The mean age for male patients were 56±12.9, and for female patients 68.7±9.6 (p<0.05). The mean age for female patients was significantly older than male patients. The patients in the thrombolytic treatment group had mortality rate of 6.25% which is lower than that of the conservative treatment group at 12% (p>0.05). Conclusion: Although in our study, small number of acute myocardial infarct patients caused the statistical insignificance, rapid revascularization by thrombolytic therapy within 6 hours of onset of symptoms improved mortality rate and early ambulation. And we had good results on AMI with thrombolytic agent in ChungJu including near rural area as primary emergency hospital. Therefore a prospective research with greater number of subjects is needed to develop better treatments for AMI.
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한국인 만성 긴장형두통 환자에서 바이오피드백을 활용한 자율적 이완훈련의 효과
강은호,안주연,구문선,박주언,유범희 大韓神經精神醫學會 2008 신경정신의학 Vol.47 No.3
Objectives : We aimed to evaluate the efficacy of biofeedback-assisted autogenic training for chronic tension-type headache, and to determine the relationship among the changes in electromyography (EMG) activity, headache activity, and mood states according to the psychophysiological treatment. Methods : Chronic tension-type headache patients aged from 20 to 40 years (n=35) were randomized to the treatment group receiving biofeedback-assisted autogenic training (8 sessions) or the monitoring-only control group. EMG activities, headache index, and various psychological variables were examined. Results : We found greater treatment response rate (≥50% reduction in headache index) in patients with biofeedback-assisted autogenic training than in the monitoring group (61% vs. 18% ; χ²=6.882, df=1, p=0.01). There were no significant changes in the mean values of the pretreatment EMG activities across the sessions m either group (all p’s>0.1). Mood states including anxiety and depression improved over time in the both groups, with the improvements being more prominent in the treatment group. Moreover, the reduction in depression level predicted treatment outcome in terms of headache index (95% confidence interval : 0.272-0.966, p=0.039). Conclusion : These results show that biofeedback-assisted autogenic training is effective for the treatment of chronic tension-type headache in a Korean population. Changes in mood states may be closely associated with the clinical outcome in the treatment of chronic tension-type headache using biofeedback-assisted autogenic training.
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Possibility of Discriminating the Presence of Tinnitus through Repeated Tinnitograms
Moon Suh Park,류은웅,Chul Kwon,Cheol Eon Park,Jae Yong Byun,Seung Geun Yeo 대한청각학회 2011 Journal of Audiology & Otology Vol.15 No.3
Background and Objectives: The evaluation of tinnitus is becoming increasingly important in assessing the degree of disability. However, until now, there are no tools to verify the presence of tinnitus. The aim of this study was to identify the possibilities in discriminating the presence of tinnitus through tinnitus test, pitch match test and loudness balance test. Materials and Methods: Typically, 50 patients who have suffered from continuous tinnitus and 20 subjects with normal hearing ability who did not suffer from tinnitus were selected for the present investigation. All the patients underwent the tests for pitch match and loudness balance, which were replicated thrice with 1-minute intervals with a TDH 49 headphone and an oribiter model 922, GN otometrics in a soundproof room. Non-tinnitus group that didn't have tinnitus chose virtual tinnitus based on their own discretion. Results: The most similar sounds mimicking tinnitus were of pure tone in both the groups. However, subjects of the tinnitus group were exposed to a greater variety of sounds than those of the non-tinnitus group. Moreover, the most common frequency of tinnitus was 4 and 8 kHz in the tinnitus group, but 1 kHz in the non-tinnitus group. The mean loudness of tinnitus was 7.28 dBSL in the tinnitus group and 13.6 dBSL in the non-tinnitus group. The loudness of tinnitus in the tinnitus group was less than that in the non-tinnitus group in a statistically significant manner (p<0.05). Loudness in each repeated tinnitus tests was identical in tinnitus group, but significantly different in non-tinnitus group (p<0.05). Conclusions: We concluded that repeated tinnitus tests for loudness matching were helpful in identifying the presence of tinnitus. Introduction Tinnitus is an abnormal sound, which is felt with no stimulation, and about 8-10% of people suffer from this condition. Most of the people amongst 8-10% have become as well as being habituated to tinnitus, and about 1% of them are seriously suffering from the inconvenience caused by the condition.1) Tinnitus is usually a subjective symptom, which could also be expressed by duration and frequency components. Clinically, patients can express tinnitus by using the method to speak similar voices like tinnitus or indicate similar sounds around themselves. However, such a strategy might cause differences between the individuals and it is not easy to evaluate psychoacoustic characteristics because of ones' own diverse auditory experiences. Therefore, the recent methods to evaluate tinnitus have definite limitations, although a number of methods have been developed, which express tinnitus in a more objective way as per the feelings of the patients. Meanwhile, the presence of tinnitus has been recently considered as a criterion for determining the degree of the disability caused by various industrial, but there is no way to objectively prove the presence of tinnitus. However, we can objectively employ the auditory brainstem response test to evaluate the degree of hearing loss. Therefore, in the present study, our aim was to find the usefulness of the repeated tinnitogram in diagnosing the presence of tinnitus. Materials and Methods The study was conducted in 50 patients, who have been suffering from continuous tinnitus for more than 6 months since 2006, and in 20 virtual tinnitus patients (non-tinnitus group) who were assumed to be complaining of tinnitus (actually they do not have any symptoms of tinnitus). Moreover, we excluded the patients who had problems in communicating due to severe hearing loss on both ears, while there were no restrictions with respect to gender, age, cause of tinnitus, duration, direction of progress, and degree of disability. In case of virtual tinnitus patients, volunteers with normal hearing and no experience of tinnitus were also selected for the present study. The average age for the tinnitus patient group was 55 years (14-80 years) and 27 years (23-33 years) for the non-tinnitus patient group (Table 1). Otologic (hearing) evaluation For hearing evaluation, an audiometer (GN otometrics, Orbiter model 922, Chicago, IL, USA) was used to measure individual thresholds for pure tones of 125, 250, 500, 1,000, 2,000, 3,000, 4,000, 6,000, and 8,000 Hz frequencies for more than twice. If any threshold for the respective frequencies was found to be above 26 dB, the condition was diagnosed as hearing loss. For non-tinnitus group, there was no hearing loss on both ears. Measurement of tinnitus Fixed frequency-pitch match test Pure tone and narrow band noise were used according to the range of loudness and frequency. As pure tone, sounds generated in the audiometer (GN otometrics, Orbiter model 922, Chicago, IL, USA) were used, and, as for frequencies, 11 kinds of frequencies were used: 125, 250, 500, 750, 1,000, 1,500, 2,000, 3,000, 4,000, 6,000, and 8,000 Hz. Loudness of tinnitus had the range from 0 to 110 dB, which were adjustable at intervals of 1 dB. The most similar frequency was found by asking the patients about the frequency, which was most similar to their tinnitus, and then moving the dissimilar side to the similar side scale by scale. In the beginning, when it was not possible to find the similar tone through the pure tone test, the test was conducted with narrowband noise. When no similar tone was found even through narrowband noise, white noise and voice signal noise were used in order to figure out the kinds of sounds. However, white noise and voice signal noise are not specific with respect to the frequency, and thus those who selected white noises or voice signals amongst the tinnitus and non-tinnitus groups, were excluded from the statistical analysis of the frequency...
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Seung Eon Moon,박배호,Eun-Kyoung Kim,류한철,Jong Hyurk Park,Kang-Ho Park,Kwang Yong Kang,Min Hwan Kwak,이수재,Sunglyul Maeng,Young Tae Kim 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
Highly oriented polycrystalline nickel-oxide films were grown on Pt (111) substrates moderately heated by using a non-reactive pulsed laser deposition method. The oxygen pressure of the process vacuum was varied from 1 to 200 mTorr to study its effect on the composition with the other parameters fixed. The oxygen-pressure-dependent compositional, structural, and electrical properties of the nickel-oxide films were investigated by using X-ray diffraction, atomic force microscopy, scanning electron microscopy, and current-voltage measurements. From the measurements, the oxygen content during deposition was an important factor for the structural properties and for reproducible resistance-switching characteristics.
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Phosphorus Doping of Si Nanosheets by Spin‑on Dopant Proximity
Jeen Moon Yang,이재준,Tae-Eon Park,Dongjea Seo,Jeong Min Park,Sangwon Park,Jukwan Na,Juyoung Kwon,Hyo-Jung Lee,Jaehyun Ryu,최헌진 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.2
Low-dimensional silicon (Si) nanostructures have been attracting a signifi cant attention for various applications includingelectrical, optical, energy devices, and bio-chemical sensors. Two-dimensional Si nanostructures, i.e., Si nanosheets (SiNSs),are promising owing to their extremely large surface area, mechanical fl exibility, and band gap modulation. In order to exploitthe potentials of SiNSs, the doping of these nanostructures is crucial; however, this has not been yet extensively investigated. In this paper, we report an n -type phosphorus doping of SiNSs using a spin-on dopant proximity technique that wasemployed to deposit a thin fi lm of phosphosilicate glass by evaporation. Structural and X-ray measurements results revealthat the phosphorus atoms are substitutionally doped and that the crystallinity and structure of the SiNSs are preserved afterthe doping. Electrical measurements show that the SiNSs are heavily n -type doped. The doping level can be modulated byadjusting the annealing temperature.
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