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이석정,최우진,배정철,김성진,이상식,권용수,홍창희,Lee, Seok-Jeong,Choi, Woo-Jin,Bae, Jeong-Chul,Kim, Sung-Jin,Lee, Sang-Sik,Kwon, Yong-Soo,Hong, Tchang-Hee 한국항해항만학회 1997 한국항해학회지 Vol.21 No.3
This paper described the method and the result of making a dynamic fiber optic gyrocompass measuring the heading angles of ships by processing the output signal from a constant rotating fiber optic sensor and also showed the measurement to test the performance of our system. Considerig an economical view we designed and ordered a cheap medium grade fiber densors increased not fiber length but the diameter of a fiber sensing loop. The scale factor and noise was 267mV/deg/s and 2 deg/hr/$\sqrt{Hz}(1{\sigma})$, respectively. We made the dynamic fiber optic gyrocompass by this sensor. We measured the heading angles in an arbitrary direction to evaluate the accuracy of our system and the root mean square error was $0.4^\circ$. Moreover, we measured the angles ineach direction of $45^\circ$. successive rotation to know whether this system has distoritions in a specific direction or not and the root mean square error in this case was $0.5^\circ$.
경량전철사업의 RAMS 활동을 지원하기 위한 SE전산도구 적용에 관한 연구
이석정,최요철,Lee, Seok Jeong,Choi, Yo Chul 한국시스템엔지니어링학회 2014 시스템엔지니어링학술지 Vol.10 No.2
There have been growing demand of Light Rail Transit(LRT) which have a lot of advantages such as construction costs lower than the recent subway, reduction of operational costs, availability of line planning, operation of railway non-beneficiary region, flexible operations of trains, unmanned operation and also have eco-friendly advantages, it is now becoming urban railway systems when environmental issues have been highlighted all over the world. Therefore, RAMS(Reliability, Availability, Maintainability, Safety) Process and activities for effective implementation of light rail transit projects have become a very important element, and also the utilization of computerized tools to perform these more systematically and productively is sought after these days. In this paper, we have presented a plan that can support the RAMS activities by utilizing the function of the computerized SE(Systems Engineering) tool(CORE$^{(R)}$). Through support of the computerized SE tool, it would be possible more clear and efficient railway project execution.
이선녕 ( Shun Nyung Lee ),이석정 ( Seok Jeong Lee ),노진규 ( Jin Kyu Noh ),이민수 ( Min Su Lee ),이남석 ( Nam Seok Lee ),이부길 ( Bu Ghil Lee ),리원연 ( Won Yeon Lee ),용석중 ( Suk Joong Yong ),신계철 ( Kye Chul Shin ),김상하 ( Sa 대한천식알레르기학회 2008 천식 및 알레르기 Vol.28 No.4
Occupational allergic rhinitis caused by rabbit fur has been reported in Korea. However, occupational asthma due to rabbit fur has not yet reported in Korea. We report a suspected case of allergic asthma caused by rabbit fur on occupational exposure. A 35-year-old male developed dyspnea, chest discomfort related to rabbit fur. He has been worked for a spinning factory. He presented with a history of allergic rhinitis and asthma. Peripheral blood eosinophil count was 690/mm3. Bronchodilator response was positive, the results of skin prick test were positive for house dust mite, cockroach and rabbit fur. The level of specific IgE for rabbit fur was 8.39 KU/L. The methacholine challenge test was positive (PC20 1.96 mg/mL). These findings suggest that the rabbit fur could induce occupational asthma. We could not perform bronchoprovacation test with rabbit fur due to patient`s refusal. He is in a well controlled state with the use of a combination of inhaled corticosteroid and long acting β2 agonist after the avoidance of rabbit fur. (Korean J Asthma Allergy Clin Immunol 2008;28:309-312)
이석정 ( Seok Jeong Lee ),리원연 ( Won Yeon Lee ),정순희 ( Soon Hee Jung ),권우철 ( Woo Cheol Kwon ),이선녕 ( Shun Nyung Lee ),이남석 ( Nam Seok Lee ),김상하 ( Sang Ha Kim ),신계철 ( Kye Chul Shin ),용석중 ( Seok Joong Yong ) 대한결핵 및 호흡기학회 2008 Tuberculosis and Respiratory Diseases Vol.65 No.6
We report on a case of a patient with laryngo-tracheobronchial amyloidosis who complained of cough, sputum, and hoarseness. A chest X-ray showed consolidation in the right middle lobe. A chest CT scan showed diffuse, irregular narrowing of the tracheobronchial tree and atelectasis of the right middle lobe, with calcification of bronchial wall. Bronchoscopic findings were multinodular submucosal thickening of the right vocal cord, and yellowish multinodular submucosal thickening from the lower trachea through both main bronchi, as well as the lingular division of the left upper lobe, the right middle lobe, and the right lower lobe. The right middle lobe bronchus was nearly obstructed. The diagnosis of amyloidosis was made by multiple bronchoscopic biopsies on the right vocal cord and both bronchi. Pathologic findings were characteristic apple-green birefringence under polarized microscopy with Congo-red stain. The patient had no evidence of systemic amyloidosis. The patient is under conservative symptomatic treatment. (Tuberc Respir Dis 2008;65:532-536)
호흡기 알레르기증상으로 강원도의 한 대학병원을 방문한 환자에서 흡입 알레르겐에 대한 감작률
이명규 ( Myoung Kyu Lee ),리원연 ( Won Yeon Lee ),용석중 ( Suk Joong Yong ),신계철 ( Kye Chul Shin ),이선녕 ( Shun Nyung Lee ),이석정 ( Seok Jeong Lee ),이지호 ( Ji Ho Lee ),정세현 ( Sae Hyun Jung ),정예령 ( Ye Ryung Jung ),김상하 대한천식알레르기학회 2011 천식 및 알레르기 Vol.31 No.1
Background: There are some differences in common inhalant allergens among regions in Korea. Gangwon region, including Wonju City, which has a lot of mountains is relatively less urbanized and industrialized. It is necessary to determine which inhalant allergens are common in this region. Objective: This study was conducted to observe the prevalence of sensitization to inhalant allergens in patients visiting a university hospital in Gangwon region and to evaluate the difference in sensitization rates to allergens from other regions in Korea. Method: Skin prick tests were performed with 33 common inhalant allergens on 1,596 patients with respiratory allergic symptoms from June 2005 through July 2007 at a university hospital. Result: The number of positive responders to more than 1 allergen was 609 (38.2%) of the 1,596 patients. The most common offending allergen was Dermatophagoides pteronyssinus (19.5%), followed by Dermatophagoides farinae (17.2%), Tyrophagus putrescentiae (10.1%), Trichophyton (9.5%), rabbit fur (7.8%), mugwort (7.4%), cockroach (6.5%) and orchard grass (4.9%). Conclusion: The most common offending allergen was found to be the house dust mite in Gangwon region. The sensitization rate to mugwort pollen is the highest among pollen allergens, followed by orchard grass pollen. (Korean J Asthma Allergy Clin Immunol 2011;31:27-32)
성인 비아토피 호흡기알레르기 환자에서 혈청 총 IgE와 신체질량지수의 관계
이지호 ( Ji Ho Lee ),리원연 ( Won Yeon Lee ),용석중 ( Suk Joong Yong ),신계철 ( Kye Chul Shin ),이선녕 ( Shun Nyung Lee ),이석정 ( Seok Jeong Lee ),김종환 ( Chong Whan Kim ),정세현 ( Sae Hyun Jung ),정예령 ( Ye Ryung Jung ),김상하 대한천식알레르기학회 2011 천식 및 알레르기 Vol.31 No.4
Background: Serum total IgE levels are increased in some obese patients with nonatopic respiratory allergy. It has not yet been fully determined a significant relationship between total IgE and body mass index (BMI) in nonatopic patients. We sought to examine the relationship between total IgE and BMI in patients with nonatopic respiratory allergy. Methods: We retrospectively reviewed 468 patietns with nonatopic asthma or allergic rhinitis without sensitization to 33 aeroallerens out of the 1,596 patients wirh respiratory allergic diseases who visitied Wonju Christian Hospital between June 2005 and July 2007. Nonatopy was determined by negative skin prick test results for all of the aeroallergens. Patients with were excluded from the study total IgE levels of >500 IU/mL because such levels were more frequently associated with other causes. Results: There were 468 patients with nonatopy and total IgE levels of <500 IU/mL (169 males and 299 females). The mean total IgE levels were 41.0 IU/mL in female patients with underweight (BMI<18.5 kg/m2), 64.6 IU/mL in those with normal weight (18.5≤BMI<23 kg/m2), 78.9 IU/mL in those with overweight (23≤BMI<25 kg/m2), and 85.5 IU/mL in those with obesity (BMI≥25 kg/m2). The mean total IgE levels were significantly higher in female patients with obesity or overweight than in those without (83.4 versus 61.8 IU/mL, P=0.036). There were no significant difference in serum total IgE levels according to BMI in male patients. Conclusion: Obesity may be a contributor to increased total IgE levels in female patients with nonatopic respiratory allergy. (Korean J Asthma Allergy Clin Immunol 2011; 31:288-294)
6, 7세 아동의 시연조건에 따른 지연 비단어따라말하기 능력 비교
이석정(SeokJung Lee),하지완(JiWan Ha),구민모(MinMo Koo),황유미(YuMi Hwang),편성범(SungBom Pyun) 한국언어청각임상학회 2016 Communication Sciences and Disorders Vol.21 No.1
외현적 시연, 내현적 시연, 시연 억제의 상이한 시연조건들이 아동의 음운단기기억에 어떠한 영향을 미치는지 알아보기 위해, 시연조건에 따른 지연 비단어따라말하기 수행력을 분석하고 말지각, 단기기억, 어휘량과 그 수행력과의 관계를 분석하였다. 방법: 6, 7세 일반아동 20명씩을 대상으로 외현적 시연, 내현적 시연, 시연 억제 조건에서 지연 비단어따라말하기 과제를 실시하여, 정확도와 오류유형 분석을 실시하였다. 자음변별검사, 숫자 바로따라하기 검사, 표현어휘량을 측정하여, 변인들 간 상관관계와 따라말하기 정확도에 대한 예측변인을 분석하였다. 결과: 6세 집단은 외현적 시연, 내현적 시연, 시연 억제 순으로 높은 수행력을 나타낸 반면, 7세 집단은 외현적 시연과 내현적 시연 간 유의한 차이가 없었고 두 조건과 시연 억제에서만 차이를 보였다. 6세 집단은 시연 억제에서 무반응 오류를 가장 많이 보였지만, 외현적과 내현적 시연에서는 음소대치 오류가 증가하였다. 7세 집단은 모든 시연조건에서 음소대치를 가장 많이 보였다. 말지각, 단기기억, 표현어휘량은 모든 시연조건의 수행력과 상관이 유의하게 높거나 있었다. 외현적 시연에서는 숫자 바로따라하기, 내현적 시연에서는 자음변별, 시연 억제에서는 자음변별과 표현어휘량이 예측변인으로 분석되었다. 논의 및 결론: 시연활동은 아동의 음운단기기억에 긍정적 영향을 미친다는 것을 확인하였다. 그러나 연령에 따라 외현적 시연과 내현적 시연의 효과가 다르게 나타나므로, 음운단기기억 향상을 위해서는 연령별 다른 시연전략을 적용하여야 한다. Objectives: Among memory strategies, the one most closely related to short-term mem¬ory is rehearsal strategy. This research aims to study the influences of rehearsal conditions on the phonological short-term memory of typically developing children. Methods: Forty children age 6 to 7 performed delayed non-word repetition (dNWR) tasks according to re¬hearsal conditions (vocal rehearsal, subvocal rehearsal, rehearsal suppression). The accu¬racy and error types of three dNWR tasks were analyzed. The relationships among speech perception, digit forward, expressive vocabulary, and dNWR performances by each rehearsal condition were examined. Results: The 6-year-old group showed higher performances in the order of vocal rehearsal, subvocal rehearsal, and rehearsal suppression, while the 7-year-old group showed no significant difference between vocal rehearsal subvocal re¬hearsal, showing a significance only between those two conditions and rehearsal suppres¬sion. In the 6-year-old group, a ‘no response’ was the most abundant error type in rehearsal suppression, but ‘phoneme substitution’ increased in rehearsal conditions. In the 7-year-old age group ‘phoneme substitution’ appeared most frequently of all error conditions. The variables with the most predictive power were digit forward in vocal rehearsal, speech per¬ception in subvocal rehearsal, and speech perception and expressive vocabulary in rehearsal suppression, respectively. Conclusion: dNWR performances with rehearsals showed better results than those without rehearsals. Also, there was a difference according to age between vocal rehearsal and subvocal rehearsal.