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원통형 구조물에 존재하는 원주방향 결함에 대한 신뢰도평가
이준성,김형민 경기대학교 부설 산업기술종합연구소 2004 산업기술종합연구소 논문집 Vol.27 No.-
The reliability evaluation of sui'face cracks in cylindl'ical geometries if imper:ant in the integrity evaluatlon of flawed structural components The objective of this Paper is, thus. to mathematically calculate an failure probability of tircurnferential crack in cylindrical geometry' Failure probability is calculated using first-order reliability Method (FORM) ttFhich is one of the methods to use reliability index. Some probabilistic flacture mechanics (PFM) Probtems are solved usfng the preseat method. sad the results at·e compared with those by the Monte Carlo (MC) simulation. Fatlure probabilities obtained from both calculations agree well
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^(13)C-Octanoic acid 호기 위 배출 검사의 방법에 따른 비교
이준성 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.1
Aim: To compare the accuracies of two mathematical models (non-linear vs. linear model), which is currently available, in the measurement of gastric emptying using ^(13)C-octanoic acid breath test. Method: In twenty healthy volunteers, gastric emptying of solids were measured by simultaneous scintigraphy and ^(13)C-octanoic acid breath test up to 4 hours. Gastric half-emptying times (t_(1/2)) and LAG times (t_(lag)) by breath test were analyzed using non-linear model and generalized linear model, and compared with those by scintigraphy. Results: In the comparisons of gastric emptying t_(lag), the breath test results were overestimate the scintigraphic results. The standard diviation of difference was 168 minutes (range 0 to 777) by non-linear method and 29 minutes (6 to 116) by linear method. For the t_(1/2), the breath test results were also overestimate the scintigraphic results. The standard diviation of difference was 538 minutes (range -3 to 2,406) by non-linear method and 72 minutes (-11 to 315) by linear method. Conclusions: Linear model looks more acurate than non-linear model in the measurement of gastric emptying using ^(13)C-octanoic acid breath test. However, two methods still shows overestimation compared to scintigraphic results, suggesting need for the development of accurate method of ^(13)C-octanoic acid gastric emptying breath test.
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이준성,권유하,김동휘,황미령 대한근전도전기진단의학회 2008 대한근전도 전기진단의학회지 Vol.10 No.2
Objective: To determine the lateral femoral cutaneous nerve (LFCN) ultrasonographic dimensions, nerve pathway, and regional anatomy. Method: Thirty healthy, asymptomatic adult women participated in this study. Using ultrasonography (US), we measured the cross-sectional circumference, area, diameter of the LFCN and the distance from the anterior superior iliac spine (ASIS) to LFCN. Height and weight of the subjects were obtained and body mass index (BMI) was determined. Correlation between the measured parameters and age and body mass index (BMI) was observed Result: The mean circumference, area, longitudinal and transverse diameters were 8.5±0.4 mm, 4.5± 1.0 mm2, 3.5±0.3 mm, and 1.5±0.2 mm, respectively. The mean distance between the ASIS and LFCN was 3.4±0.8 mm. There was no correlation between the US parameters and BMI or age. Conclusion: High-resolution US examination may be a useful tool in the evaluation of LFCN and diagnosis of meralgia paresthetica.
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이준성 한국건축시공학회 2012 한국건축시공학회지 Vol.12 No.6
With recent attempts to improve quality and productivity, the prefabrication manufacturing system has been occupying an increasing share of the construction area. To minimize site work, material is more frequently being produced and partially assembled at a plant, and then installed at a site. For this reason, the production process is being divided and the materials are being delivered to the site after passing through multiple plants. With these changes in the production process, the materials delivery plan is becoming an important management point. In particular, as road transportation using trucks has a 71 percent share of the domestic transportation market, selecting the proper transportation path is important when delivering materials and equipment to a site. But the management system at the project design phase to calculate the delivery cost by considering the production process of the pre-fab material and the CO2 emission at the material delivery phase is currently lacking. This study suggests a process design model for assembly production of the pre-fab material and transportation logistics based on carbon emission. The suggested model can be helpful to optimize the location of the intermediate plant. It is expected to be utilized as a basic model at the project plan and design phase when subcontractors make decisions on items such as materials procurement, selecting the production method, and choosing the location of the assembly plant.
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Risk Factors for Fluoroquinolone Resistance in Ocular Cultures
이준성,최상경 대한안과학회 2015 Korean Journal of Ophthalmology Vol.29 No.1
Purpose: To identify the risk factors associated with fluoroquinolone resistance in patients undergoing cataract surgery. Methods: A total of 1,125 patients (1,125 eyes) who underwent cataract surgery at Veterans Health Service Medical Center from May 2011 to July 2012 were enrolled in this study. Conjunctival cultures were obtained from the patients on the day of surgery before instillation of any ophthalmic solutions. The medical records of patients with positive coagulase negative staphylococcus (CNS) and Staphylococcus aureus (S. aureus) cultures were reviewed to determine factors associated with fluoroquinolone resistance. Results: Of 734 CNS and S. aureus cultures, 175 (23.8%) were resistant to ciprofloxacin, levofloxacin, gatifloxacin, or moxifloxacin. Use of fluoroquinolone within 3 months and within 1 year before surgery, topical antibiotic use other than fluoroquinolone, systemic antibiotic use, recent hospitalization, ocular surgery, intravitreal injection and use of eyedrops containing benzalkonium chloride were significantly more frequent in resistant isolates than in susceptible isolates. In multivariable logistic regression analysis, ocular surgery (odds ratio [OR], 8.457), recent hospitalization (OR, 6.646) and use of fluoroquinolone within 3 months before surgery (OR, 4.918) were significant predictors of fluoroquinolone resistance, along with intravitreal injection (OR, 2.976), systemic antibiotic use (OR, 2.665), use of eyedrops containing benzalkonium chloride (OR, 2.323), use of fluoroquinolone within 1 year before surgery (OR, 1.943) and topical antibiotic use other than fluoroquinolone (OR, 1.673). Conclusions: Recent topical fluoroquinolone use, hospitalization and ocular surgery were significantly associated with fluoroquinolone resistance in CNS and S. aureus isolates from ocular culture.
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이준성 대한전자공학회 2013 전자공학회논문지 Vol.50 No.11
This paper describes a DC-DC converter IC for Flat Panel Displays. In case of operate LCD devices various type of DC supply voltage is needed. This device can convert DC voltage from 6~14[V] single supply to -5[V], 15[V], 23[V], and 3.3[V] DC supplies. In order to meet current and voltage specification considered different type of DC-DC converter circuits. In this work a negative charge pump DC-DC converter(-5V), a positive charge pump DC-DC converter(15V), a switching Type Boost DC-DC converter(23V) and a buck DC-DC converter(3.3V). And a oscillator, a thermal shut down circuit, level shift circuits, a bandgap reference circuits are designed. This device has been designed in a 0.35[㎛] triple-well, double poly, double metal 30[V] CMOS process. The designed circuit is simulated and this one chip product could be applicable for flat panel displays. 본 논문은 플랫판넬 디스플레이 장치에 사용할 DC-DC 변환기의 설계에 관한 것이다. 6~14[V]의 단일 DC 전원전압으로 부터 플랫 판넬 백바이어스용 -5[V] DC 전압 발생회로(Negative DC Voltage Generator)와 승압된 15[V], 23[V] DC 전압 발생회로, 그리고 강압된 3.3[V] DC를 얻기 위한 회로를 설계하였다. 또한 기준 전압원으로 사용하기 위한 밴드갭 회로와 발진기, 레벨변환기 회로, 고온보호 회로 등을 설계하였다. 제작공정은 부(-)전압으로 동작하는 회로와 기타 회로를 분리하기 위해서 트리플-웰(Triple-Well)구조가 적용된 공정 내압 30[V], 최소선폭 0.35[㎛], 2P_2M CMOS 공정을 사용하였다. 설계된 모든 회로는 시뮬레이션으로 검증하여 동작을 확인하였으며 원 칩으로 제작하여 플랫판넬 디스플레이 장치에 응용할 수 있도록 기능을 확보하였다.
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