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유상준(Yoo, Sangjun),김제용(Kim, Jeyong) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.3
본 논문은 MIL-STD-662F의 방호한계속도 산출을 위해 충돌속도를 추정하는 새로운 방법을 제안하였다. 기 존 MIL-STD-662F의 방법은 충돌속도를 추정하기 위해 상대공기밀도, 항력계수, 형상인자, 탄도계수 등이 필요하여 기초연구가 필수적이라는 한계를 가지고 있다. 하지만 제안한 방법은 기초연구 없이도, 기기에서 측정된 속도와 측정 기기와 타격점까지 거리만으로 충돌속도를 추정할 수 있다. 이를 검증하기 위해 M193탄과 M80탄을 사용하였고, 미 국의 검증된 PRODAS의 데이터를 기반으로 MIL-STD-662F 방법의 충돌속도 추정값과 제안한 방법의 충돌속도 추정 값을 비교하고 분석였다. 실험결과에서 제안한 방법이 일부 속도구간에서는 MIL-STD-662F의 방법보다 오차가 크지 만 방호한계속도 산출은 가능하였고, 대부분의 속도구간에서는 MIL-STD-662F보다 오차가 작다는 것을 보였다. This paper proposes a new method to estimate the striking velocity for ballistic limit velocity in MIL-STD-662F. The method from MIL-STD-662F needs relative air density, drag coefficient, form factor, ballistic coefficient for estimating striking velocity. So precedent studies are essential. However, the new method can estimate striking velocity only using measured velocities and distance between the screen and the target. To prove new method, we compared estimation of striking velocity from both the new method and the method from MIL-STD-662F on the basis of datain PRODAS. The new method shows bigger errors in some velocity ranges. But it could still calculate ballistic limit velocity. It also shows smaller errors in most velocity ranges.
유상준(Sangjun Yoo),민세원(Sewon Min),정해석(Haesok Jeong),백창현(Changhyun Baek) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
The latest vehicle technology is concentrated in the fuel efficiency and alternative energy. The hybrid vehicle is the one of vehicles reflected the latest vehicle technology. To improve the fuel economy in a hybrid vehicle becomes more and more important recently. The energy consumption for interior heating in a vehicle affects the fuel economy. The calorie of heater is decided by the temperature of the engine coolant through the heater. So it needs to turn the engine on to keep the heater performance. It’s very important to reduce the time of the engine drive mode for interior heating. This paper presents the optimal climate system control method to improve fuel economy and thermal comfort in a hybrid vehicle by using a discharge temperature sensor. The climate controller can decide the optimized timing of "engine on request" to keep the appropriate calorie of heater on the motor drive mode because it"s possible to estimate the optimized calorie of heater to meet the requested discharge temperature target by using discharge air temperature sensor in the ‘temperature door control’ and the ‘engine on request’ algorithm.
림프절 전이 방광암에서 림프절 관련 인자들의 예후 가치
유상준(Sangjun Yoo),정인갑(In Gab Jeong) 대한비뇨기종양학회 2015 대한비뇨기종양학회지 Vol.13 No.2
In spite of multidisciplinary treatment, about 70% of lymph node (LN) positive bladder cancer reported to be recurred within 5-year after radical cystectomy and pelvic lymphadenectomy although considerable number of patients survived for a long period without adjuvant treatment after surgery. Current TNM nodal staging system doesn’t account for this survival differences. In this regard, several LN-related parameters were developed to predict prognosis of LN positive bladder cancer. In this article, we will state the controversies on current TNM nodal staging system for bladder cancer. In addition, we will review the accuracy of imaging studies to predict LN metastasis before surgery and impact of several surgical and pathologic LN-related parameters, such as extent of lymphadenectomy, number of removed LNs, number of metastatic LNs, LN density, extracapsular extension of LN, on prognosis of LN positive bladder cancer. Moreover, we will review the value of adjuvant chemotherapy on LN positive bladder cancer.
이민구(Mingu Lee),유상준(Sangjun Yoo),박종원(Jongwon Park),김수현(Soohyun Kim) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.2
Based on recent advances in technology, many robots are developed and they are used in a hazardous environment such as military operation, fire, and building collapse and so on. Among them, reconnaissance robot should be able to perform various missions which people can not do. So it needs the capability of moving with hiding its position on rough terrain, overcoming obstacles, and guaranteeing its efficiency of reconnaissance. For this reason there are in progress of researching biomimetic robots. Therefore in this paper we proposed robot mechanism, two modules based on the screw and wheel mechanism which mimic snake, and the spiral climbing method was considered for overcoming the situation when moving on the trees.
Minhyun Cho(조민현),Sangjun Yoo(유상준),Juhyun Park(박주현),Chang Wook Jeong(정창욱),Ja Hyeon Ku(구자현),Cheol Kwak(곽철),Hyeon Hoe Kim(김현회),Min Chul Cho(조민철),Hyeon Jeong(정현) 대한비뇨기종양학회 2018 대한비뇨기종양학회지 Vol.16 No.2
Purpose: We evaluated the prognostic value of the 5-tiered grade group in Korean patients who underwent radical prostatectomy. Materials and Methods: Between 1996 and 2016, a number of 2,883 consecutive patients who underwent radical prostatectomy were included for the analysis. The impacts of biopsy and pathologic grade group on predicting biochemical recurrence (BCR) were assessed using multivariate analysis. Median follow-up duration was 49.0 months. Results: Mean age was 66.5 years and prostate-specific antigen (PSA) was 11.8 ng/mL. Prostate cancer was locally advanced on magnetic resonance imaging in 13.4%. Biopsy grade group was as follows: 1 (46.8%), 2(19.8%), 3 (14.2%), 4 (14.1%), and 5 (5.1%). Pathology stage was ≤T2 in 63.6%, T3a in 26.0%, and T3b/T4 in 10.4% patients. Pathologic grade was as follows: 1 (31.3%), 2 (37.9%), 3 (20.2%), 4 (4.7%), and 5 (5.1%). In multivariate analysis using biopsy-related variables, biopsy grade group (1, reference; 2, hazard ratio [HR], 1.771; p=0.001; 3, HR, 2.736; p<0.001; 4, HR, 2.966; p<0.001; 5, HR, 3.707; p<0.001) was associated with BCR-free survival, PSA level and % positive core. In multivariate analysis using pathologic outcomes, pathologic grade group(1, reference; 2, HR, 1.882; p<0.001; 3, HR, 3.352; p<0.001; 4, HR, 3.890; p<0.001; 5, HR: 3.118, p<0.001) was associated with BCR-free survival in addition to pathologic stage and positive surgical margin. Conclusions: New 5-tiered grading system could be useful for predicting oncological outcomes in Korean patients although its role for distinguishing outcomes between patients with grade groups 3.5 need to be validated before wide application of this grade system in Korea.
하윤석(Yun-Sok Ha),김광택(Kwang Taek Kim),남욱(Wook Nam),박홍주(Hongzoo Park),유상준(Sangjun Yoo),이찬호(Chan Ho Lee),정호석(Ho Seok Chung),최우석(Woo Suk Choi),김지연(Jiyoun Kim),신재은(Jaeeun Shin),김정현(Jeong Hyun Kim),곽철(Cheol 대한비뇨기종양학회 2021 대한비뇨기종양학회지 Vol.19 No.3
Purpose: The survey was conducted on Korean men to examine information acquisition channel for prostate cancer high risk group as part of the “Blue Ribbon Campaign” of the Korean Urological Oncology Society. Materials and Methods: An online survey of 500 men aged 50 years old or older was completed to query investigation of the status of prostate cancer awareness and information acquisition from February 4 to February 9, 2021. Results: Most men in their 50s and older are well aware that prostate cancer can also occur in young men in their 40s, so the rate of misunderstanding of the timing of prostate cancer screening after their 60s is very low. Two-thirds of all respondents (67.2%) were also confirmed that prostate cancer had no initial symptoms and was not included in the national cancer screening. Seventy-five percent of people look up information on their own in case of suspected prostate cancer, and 51.6% seek out knowledge on their own to prevent prostate cancer. Of the respondents, 27.4% of men contacted prostate cancer-related information within the past year, and the percentage of people contacted through ‘Internet/Phone,’ ‘People Around’ and ‘Television’ was high. The most trusted channel among prostate cancer information channels was ‘medical professionals,’ but the experience rate was not high, and the channel with high experience rate and reliability was shown as ‘television.’ Conclusions: Much effort is still needed to understand the information acquisition behavior of Korean men and to improve awareness of early screening for prostate cancer.