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황준하,서영수,임영배 明知大學校 産業技術硏究所 1994 産業技術硏究所論文集 Vol.13 No.-
In this paper,the inverter-voltage source of AC Electrical Vehicle System has generally used voltage type PWM converter. A parallel operation of two single-phase voltage typed PWM converters used IGBT which achives the bidirectional power floe between a single phase AC supply and a DC bus voltage is described. The parallel operating system has reduced current ripple of a source than a single device operation, and made a converter capacity increased.Also,the voltage type PWM converter made the input current wave as sinusoidal wave, and performs the high power factor driving.
주요우울증이 근로자의 생산성에 미치는 영향 : WHO-HPQ(Health and Work Performance Questionnaire)를 이용한 예비연구
김원,황태연,함병주,이준석,최병휘,김세주,서용진,강은호,우종민 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.6
Objectives : Major depressive disorder (MDD) causes patients' distress and makes socioeconomic burden, both directly and indirectly. We used the concept of lost productive time (LPT) to estimate the indirect costs and calculated both absenteeism and presenteeism among workers with MDD. Mcthods : Depression group was recruited from workers visiting psychiatric outpatient clinic who had MDD without major physical or mental disorders (N= 106). Age and sex matched healthy control group was also recruited through advertisement (M=100). All participants completed a interview using WHO Health and Work Performance Questionnaire (HPQ), Job Stress Measurement Scale for Korean Employees, and Hamilton Rating Scale for Depression. Statistical analysis was performed with independent t-test or χ² test as characteristics of values (p=0.05). Results : The number of absence (0.94-day/month vs. 0.10-day/month, P=0.015) andthe numberofearly leaving (2.56-day/month vs. 0.24-day/month, P<0.001) were significantly higher in the depression group. Depression group evaluated their Perfor-mance level much lower than controls with significant value (5.16 vs. 7.62, P<0.001). In addition, depression group estimated their performance level during the last 4 weeks lower compared to the level of past 1-year (5.16 vs 6.63, P<0.001). The estimated costs of absenteeism in depression group were higher than controls by 2,520,000 Korean Won per year, and those of presenteeism were also higher by 4,880,000 Korean Won per year. The total costs of LPT in depression group were higher than controls by 7,400,000 Korean Won, which corresponds to 26% ofmean annual salary. In addition, the level of occupational stress, such as high demand and interpersonal conflict, was higher in the depression group. Conclusion : Major depressive disorder costs substantial productivity loss to workers and their company. Presenteeism imposes more time cost than absenteeism. Effectiveness trials are needed to devise cost-effective programs for the early detection and treatment of depression at the workplace.
Original Article : Effects of Multicurve RGP Contact Lens Use on Topographic Changes in Keratoconus
( Joon Seo Hwang ),( Jin Hak Lee ),( Won Ryang Wee ),( Mee Kum Kim ) 대한안과학회 2010 Korean Journal of Ophthalmology Vol.24 No.4
Purpose: To evaluate the effects of wearing rigid gas permeable (RGP) contact lenses on the topographic changes in keratoconus. Methods: Seventy-seven keratoconic eyes that wore multicurve RGP contact lenses and 30 keratoconic eyes that wore no contact lenses were retrospectively analyzed. The mean follow-ups were 22.6 and 20.5 months in the lens-wearing and control groups, respectively. Visual acuity, comfort, daily wearing time, and corneal staining were evaluated for both groups. The changes in topographic indices were compared between the lens-wearing and control groups. Results: Multicurve RGP lens corrected logarithm of the minimum angle of resolution visual acuity of the lens-wearing group significantly improved from -0.016±0.065 to -0.032±0.10 at follow-up (p=0.05). In the lens-wearing group with advanced keratoconus, the Sim Kmax, Sim Kmin, apical power, astigmatic index, and anterior elevation significantly decreased from 57.68±4.26 diopter (D), 50.50±2.32 D, 62.79±5.11 D, 7.20±0.55 D and 67.36±16.30 ㎛ to 55.51±4.28 D, 49.62±3.26 D, 60.31±5.41 D, 5.90±0.51 D and 60.61±16.09 ㎛, respectively (paired t-test, p<0.05). The irregularity index of 3 mm did not significantly change. Meanwhile, in the control group, the apical power and irregularity index increased from 55.56±7.25 D and 3.06±1.68 D to 57.11±7.75 D and 3.25±1.71 D, respectively (paired t-test, p=0.008, p=0.01). Conclusions: Properly fitted multicurve RGP contact lenses are not likely to contribute to the progression of keratoconus.
OSGI 기반의 실시간 확장 가능한 AIDC 미들웨어 아키텍쳐
황준석(Joon-seok Hwang),이현동(Hyun-dong Lee),황성일(Sung-il Hwang),강호영(Ho-young Kang),서대교(Dae-kyo Seo) 한국정보과학회 2009 한국정보과학회 학술발표논문집 Vol.36 No.1
현재 국내의 대부분 RFID 미들웨어 아키텍처는 다양한 벤더의 RFID 리더를 지원하는 추상 리더 인터페이스와 상위 어플리케이션 연동을 위한 다양한 프로토콜 지원에 중점을 두고 있다. 하지만, 산업 현장에 적용할 경우에는 복잡한 환경 및 기존 시스템과의 연계 시 발생하는 요구사항과 RFID, 센서 및 바코드 장비들 마다 서로 다른 통신 프로토콜로 인해서 미들웨어 커스터마이징 비용이 증가되고 있다. 이러한 문제점을 해결하기 위해서, 본 논문에서는 실시간 서비스 지원과 이식성 향상을 위한 “OSGi 기반 AIDC 미들웨어 아키텍쳐"를 제안하고 이를 이용하여 AIDC 미들웨어를 연구 개발한다.
황준서(Joon Seo Hwang),유형곤(Hyeong Gon Yu) 대한검안학회 2012 Annals of optometry and contact lens Vol.11 No.1
목적: 한국인 망막색소변성 환자의 초진 시 시야장애를 평가하고자 한다. 대상과 방법: 망막색소변성 환자의 초진 시 시야, 시력장애의 분포와 유전양상에 따른 차이를 분석하였다. 결과: 총 400명의 환자의 유전양상은 상염색체우성 17.0%, 상염색체열성 11.0%, X-연관열성 3.5%, 단순형 68.0%였다. 잔존시야가 반경 50o 이상인 환자가 7.3%, 25∼50o가 10.8%, 10∼25o가 29.3%, 10o 미만(World Health Organization 분류: 심한 저시력)이 52.8%였다. 중심시력은 20/30 이상이 43.8%, 20/100∼20/30이 44.5%, 20/200∼20/100이 5.5%, 20/200 미만(심한 저시력)이 6.3%으로, 중심시력저하가 시야장애에 비해 경하였다. 유전양상에 따른 장애는 상염색체열성과 X-연관열성에서 심해, 반경 25o 이상의 잔존시야를 보이는 경우가 없었고, 20/30 이상인 시력을 가지는 비율도 낮았다(15.2%, 35.7%). 결론: 한국인 망막색소변성 환자는 초진 시 진행된 시야장애를 보이고, 시야장애가 중심시력저하보다 심하였다. 상염색체열성과 X-연관열성 환자에서 상염색체 우성과 단순형에 비해 더 진행된 시야장애를 나타내었다. Purpose: To evaluate visual field defect of Korean patients with retinitis pigmentosa (RP). Methods: A total of 400 patients with RP who were diagnosed within 3 years, 231 males and 169 females were included in this study. Data were collected including age, symptomatic disease duration, family history, visual acuity (VA), Goldmann visual field (VF) at the initial visit. Results: Determination of inheritance pattern revealed 17.0% autosomal dominant RP cases, 11.5% autosomal recessive (AR) RP, 3.5% X-linked recessive (XL) RP, and 68.0% simplex RP, indicating a relative small proportion of AR RP cases. The remaining visual filed was ≥50o (radius) in 7.3%, 25∼50o in 10.8%, 10∼25o in 29.3% and ≤10o in 52.8%. Visual acuity was ≥20/30 in 43.8%, 20/100∼20/30 in 44.5%, 20/200~20/100 in 5.5% and ≤20/200 in 6.3%. The functional acuity score of 83.3±17.2 was higher than the functional field score of 49.9±20.5. VA and VF defects were greater in AR RP and XL RP than in other types, the proportion of ≥20/30 VA was smaller and there was no patient who had VF greater than 25o. Conclusions: Korean RP patients had advanced visual field defect at the initial visit. VF defect was greater than VA loss and more severe in the patient with AR RP and XL RP.
Protective Effects of Edible Insect Extracts against Acute Alcoholic Liver Damage
Bo Byeol Hwang,Min Kook Lee,Eun Hee Jo,In Seon Hwang,Seong Hwan Ahn,Yun Jin Bae,Chang Hyun Oh,Yong Seol Kim,June Su Kim,Min Chul Cho,Sam Hyun Baek,Sang Hoon Lee,Won Joon Oh,Seo Yeong Hwang,Sun Jae Kim 한국식품영양과학회 2017 한국식품영양과학회 학술대회발표집 Vol.2016 No.10
Hwang, Hye Jeon,Seo, Joon Beom,Lee, Hyun Joo,Lee, Sang Min,Kim, Eun Young,Oh, Sang Young,Kim, Ji-Eun by Lippincott Williams Wilkins 2013 Journal of computer assisted tomography Vol.37 No.4
OBJECTIVE: This study aimed to determine optimal strength of sinogram-affirmed iterative reconstruction (SAFIRE) and to evaluate image quality (IQ) of low-dose chest computed tomography (LDCT) using SAFIRE compared with iterative reconstruction in image space (IRIS) and filtered back projection (FBP). METHODS: Thirty patients underwent LDCT. Computed tomography (CT) was reconstructed using 5 strengths of SAFIRE (S1-S5), IRIS, and FBP. Objective noise of CT was measured. Two radiologists evaluated CT for subjective IQ, beam-hardening artifacts, and overall IQ. RESULTS: Measured noise was highest in FBP, followed by S1, S2, S3, IRIS, S4, and S5. S2 and S3 demonstrated significantly higher overall IQ scores than the other strengths (P < 0.05). Overall IQ and beam-hardening artifacts of S2 and S3 were significantly better than those in FBP and IRIS (P < 0.001). CONCLUSIONS: S2 or S3 strengths of SAFIRE can be used practically in clinical routines and may have more potential than IRIS and FBP for LDCT with improved IQ.
Injury trends among foreign and domestic tourists in Jeju from 2008 to 2018
Hwang, Ki Sang,Lee, Sung Kgun,Song, Sung Wook,Kim, Woo Jeong,Kang, Young Joon,Kang, Kyeong Won,Park, Hyun Soo,Park, Chang Bae,Kang, Jeong Ho,Bu, Ji Hwan,Ko, Seo Young Institute for Medical Science 2022 The Journal of Medicine and Life Science Vol.19 No.1
Jeju is the largest island in Korea and one of its key tourist attractions. As the number of foreign tourists steadily increases, so does the number of injuries incurred there. Accordingly, this study aimed to describe and compare the characteristics of injuries suffered by foreign tourists versus those of domestic tourists. As a cross-sectional study of a retrospective medical record survey, the study was conducted with reference to the Jeju Injury Surveillance System from the 11-year period of January 2008 to December 2018. The following factors were investigated: demographic data, mechanism of injury, place of occurrence, activity when injured, patient outcome, and mortality. A total of 92,095 injured Jeju Island visitors was recorded during this time, a number that included 88,050 Koreans and 4,045 foreigners. The gender ratio showed similar patterns between the two groups and there were no significant age differences. In both groups, the most common mechanism of injury was collisions/cuts. Also, more foreigners experienced falls than Koreans. Regarding the location, Koreans had the most road accidents, while foreigners were most likely to be injured at outdoor locations, such as seas and rivers. Furthermore, more foreigners experienced severe injuries requiring hospitalization. Notably, this study showed the differences in injury between foreign and Korean tourists visiting Jeju Island and its findings lend support to targeted safety promotion programs.