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Lv.4 자율주행 기술 기반 수요 대응 모빌리티 시스템 성능 검증 방법론 개발
장지용,문병섭,하정아 한국도로학회 2023 한국도로학회논문집 Vol.25 No.6
PURPOSES : This study is to develop an comprehensive validation methodology for autonomous mobility-on-demand system with level 4 automated driving system. METHODS : The proposed method includes the quantitative techniques for validating both automated driving system and center system using each optimal indicators. In addition, a novel method for validating the whole system applying multi-criteria decision methodology is suggested. RESULTS : The relative weights for the vehicle system was higher than the center systems. Moreover, the relative weights of failure rate for validating the vehicle system was the highest, in addition to, a relative weight for accuracy of dynamic routing algorithm within center system was the highest. CONCLUSIONS : The proposed methodology will be applicable to validate the autonomous mobility on demand system quantitatively considering the relative weights for each systems.
장지용,한세영,김진석,박성용,Jang, Ji-Yong,Han, Sae-Young,Kim, Jin-Seok,Park, Sung-Yong 한국정보처리학회 2008 정보처리학회논문지 A Vol.15 No.3
가상화 시스템은 시스템 활용률을 높이는 반면, 추가된 가상화 계층으로 인해 응용 프로그램의 성능 저하를 가져오므로, 본 논문에서는 두 가지 측면을 모두 고려하여 비 가상화 시스템과 성능을 비교할 수 있도록 하는 가상화 시스템의 성능평가 방법을 제안하였다. 가상화 시스템과 비 가상화 시스템을 비교할 수 있는 성능 비교 지표(metric)로 통합작업처리량 대비 시스템 낭비율을 정의하고, 가상화 시스템과 비 가상화 시스템에서 각각 시스템 낭비율과 통합작업처리량을 구할 수 있는 방법을 제시하였다. 또한 제안한 성능 평가 방법을 이용하여 다양한 응용 프로그램들을 운영하는 가상화 시스템과 비 가상화 시스템의 성능을 비교함으로써 본 연구에서 제시하는 가상화 시스템의 성능평가 방법이 적합함을 보이고, 더불어 응용 프로그램의 서로 다른 특성이 가상화 시스템에 미치는 영향을 분석하였다. Consolidating servers into a virtualized system increases entire system utilization, while suffers from performance degradation due to the additional virtualization layer. In this paper, we proposed a performance evaluation methodology for comparing virtualized systems with native non-virtualized systems. We defined a system waste rate per consolidated throughput as a metric, and described the method for calculating system waste rate and consolidated throughput for both of virtualized systems and non-virtualized systems. Using the proposing performance evaluation methodology, we established testbeds, evaluated their performance, and compared the metrics of both systems. As a result of the evaluation, we could show the appropriateness of our methodology and analyze the effect of the application characteristics.
장지용 신라대학교 부산학연구센터 2018 부산연구 Vol.16 No.2
The study aims to review the changes and current status of the industry structure in Busan. First, statistical data related was organized. TAs a result, each Gu·Gun in Busan showed different change trend. First, manufacturing is concentrated in Gangseo-gu, and traditional industrial areas such as Busan Jin-gu, Sasang-gu, and Saha-gu were found to have a tendency to small. Second, the service industry tends to change and characterize each Gu·Gun. Busan Jin-gu is characterized by financial insurance, although it has a high roportion in many sectors. The old central region was generally depressed. JungGu showing signs of recovery. The center of the business community is formed around Haeundae and the share of high value-added productive services is increasing. In addition, the wholesale and retail trade centered on machinery of Sasang Gu was more important. The results of this analysis suggest that Busan's policies need to be customized for each district. 본 연구는 부산시의 각 구군별로 어떤 부문이 어떻게 변화하였는가를 고찰하였다. 필요한 부분에 대해서는 세세분류까지 살펴보았다. 고찰결과 부산의 각 구군은 지역적으로 다양한 변화의 모습을 보이고 있었다. 첫째, 제조업의 경우는 강서구로 집중되는 모습을 보이고 있고, 전통적인 공업지역인 부산진구, 사상구와 사하구는 영세화하는 경향을 발견할 수 있었다. 둘째, 서비스업의 경우는 구군별로 변화가 심하고 특화하는 경향을 보였다. 부산진구의 경우는 다수의 부문에서 높은 비중을 보이고 있었지만 금융보험을 중심으로 특화하는 모습을 보이고 있다. 원도심에 해당하는 지역이 전체적으로 침체한 가운데 중구가 회복하는 모습을 보이고 있었다. 상권의 중심은 해운대를 중심으로 형성되고, 고부가가치의 생산적 서비스의 비중이 높아지고 있다. 또 사상은 기계류를 중심으로 하는 도소매업의 비중이 높았다. 이러한 분석의 결과는 부산시의 정책이 각 구군 맞춤형으로 진행될 필요가 있음을 제기하는 것이다.
Compartment Syndrome Induced by Carbon Monoxide Poisoning
장지용,이근,임용수,우재혁,장재호 대한응급의학회 2014 大韓應急醫學會誌 Vol.25 No.6
Carbon monoxide (CO) poisoning is the most commoncause of fatal poisoning in the United States and may bethe most common worldwide cause of fatal poisoning. COpoisoning can affect the entire body and usually causesneurologic or cardiac injury. While not common, rhabdomyolysis,skeletal muscle necrosis, and renal failure can alsooccur. We report on a suicidal 22-year-old man who inhaledCO gas from a burning briquette. His case was complicatedby compartment syndrome (CS). Finally, he had to undergofasciotomy and removal of necrotic muscle. A CO poisonedpatient who is unconscious cannot describe symptoms andmoderate swelling or tenderness might be neglected. Though CS rarely appears in CO poisoning, delayed diagnosismay result in fatal consequences. Therefore, in thecase of an unconscious patient, the entire body must beexamined closely to identify early signs related to CS (tenderness,swelling, redness). If the diagnosis is uncertainafter the clinical evaluation, the pressure within the compartmentshould be measured.
장지용,이상학,김병수,서홍석,김우식,안영근,이내희,고광곤,강태수,조상호,홍범기,배장호,양형모,차광수,김범수,곽충환,조덕규,김웅,조주희,강덕현,편욱범,전국진,남궁준,차태준,전재현,정예리,장양수 대한심장학회 2015 Korean Circulation Journal Vol.45 No.3
Background and Objectives: We compared the efficacy and safety of valsartan and rosuvastatin combination therapy with each treatment alone in hypercholesterolemic hypertensive patients. Subjects and Methods: Patients who met inclusion criteria were randomized to receive 1 of the following 2-month drug regimens: valsartan 160 mg plus rosuvastatin 20 mg, valsartan 160 mg plus placebo, or rosuvastatin 20 mg plus placebo. The primary efficacy variables were change in sitting diastolic blood pressure (sitDBP) and sitting systolic blood pressure (sitSBP), and percentage change in low-density lipoprotein-cholesterol (LDL-C) in the combination, valsartan, and rosuvastatin groups. Adverse events (AEs) during the study were analyzed. Results: A total of 354 patients were screened and 123 of them were finally randomized. Changes of sitDBP by least squares mean (LSM) were -11.1, -7.2, and -3.6 mm Hg, respectively, and was greater in the combination, as compared to both valsartan (p=0.02) and rosuvastatin (p<0.001). Changes of sitSBP by LSM were -13.2, -10.8, and -4.9 mm Hg, and was greater in the combination, as compared to rosuvastatin (p=0.006) and not valsartan (p=0.42). Percentage changes of LDL-C by LSM were -52, -4, and -47% in each group, and was greater in the combination, as compared to valsartan (p<0.001), similar to rosuvastatin (p=0.16). Most AEs were mild and resolved by the end of the study. Conclusion: Combination treatment with valsartan and rosuvastatin exhibited an additive blood pressure-lowering effect with acceptable tolerability, as compared to valsartan monotherapy. Its lipid lowering effect was similar to rosuvatatin monotherapy.