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이경준(Kyoungjun Lee),문승욱(Seungwuk Moon),이승종(Seungjong Yi),이경수(Kyongsu Yi) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To design Human-Centered integrated cruise control and collision avoidance controller, we analyzed driving data of 125 human drivers. Deceleration characteristics of human driver were used in this controller as important parameters. Controlled vehicle deceleration is similar to human driver뭘 deceleration pattern. ACC/CA control algorithm consists of 4-operation modes. The collision avoidance operation mode is selected by non-dimensional warning index and the inverse Time-to-Collision(TTC?¹).
Pak, Kyoungjune,Cheon, Gi Jeong,Lee, Kyu Eun,Park, Young Joo,Choi, Hoon Sung,Min, Hye Sook,Kang, Keon Wook,Chung, June-Key,Kim, Euishin E.,Lee, Dong Soo Chapman and Hall in association with the British N 2014 Nuclear medicine communications Vol.35 No.5
<P>ObjectivesThe prevalence and risk of malignancy in thyroid incidentalomas has been investigated in previous studies; however, these studies have not looked at the characteristics of incidental thyroid cancer (ITC) detected by fluorine-18 fluorodeoxyglucose PET. Therefore, we aimed to assess the clinicopathologic features of ITC.MethodsFrom March 2008 to December 2011, a total of 2892 patients underwent total thyroidectomy for papillary thyroid cancer. Among them, patients belonging to the ITC group were defined as those in whom focal thyroid uptake was reported as an incidental finding on PET imaging and further evaluation revealed the presence of malignancy. In addition, two control groups with non-PET incidental thyroid cancer (NITC) were selected: NITC-A patients (n=48) who underwent a total thyroidectomy in March 2008 and NITC-B patients (n=48) who underwent a total thyroidectomy for papillary thyroid cancer and were matched for the confounding effects of age and sex.ResultsThere were no significant differences in clinicopathologic features, except for age and tumour node metastasis (TNM) staging, between ITC and NITC-A patients. More ITC than NITC-A patients were aged 45 years or older. Although T, N, or M staging was not different between ITC and NITC-A, there were more ITC patients with stage III/IV tumours. After matching for age and sex, none of the clinicopathologic features showed significant differences between ITC and NITC-B patients.ConclusionNo significant differences were observed between ITC and NITC patients except for age and TNM staging. More ITC patients had advanced TNM stage most likely due to patient age.</P>
Choi, Kyoungjun,Nam, Sooji,Lee, Youngbin,Lee, Mijin,Jang, Jaeyoung,Kim, Sang Jin,Jeong, Yong Jin,Kim, Hyeongkeun,Bae, Sukang,Yoo, Ji-Beom,Cho, Sung M.,Choi, Jae-Boong,Chung, Ho Kyoon,Ahn, Jong-Hyun,Pa American Chemical Society 2015 ACS NANO Vol.9 No.6
<P>Preventing reactive gas species such as oxygen or water is important to ensure the stability and durability of organic electronics. Although inorganic materials have been predominantly employed as the protective layers, their poor mechanical property has hindered the practical application to flexible electronics. The densely packed hexagonal lattice of carbon atoms in graphene does not allow the transmission of small gas molecules. In addition, its outstanding mechanical flexibility and optical transmittance are expected to be useful to overcome the current mechanical limit of the inorganic materials. In this paper, we reported the measurement of the water vapor transmission rate (WVTR) through the 6-layer 10 × 10 cm<SUP>2</SUP> large-area graphene films synthesized by chemical vapor deposition (CVD). The WVTR was measured to be as low as 10<SUP>–4</SUP> g/m<SUP>2</SUP>·day initially, and stabilized at ∼0.48 g/m<SUP>2</SUP>·day, which corresponds to 7 times reduction in WVTR compared to bare polymer substrates. We also showed that the graphene-passivated organic field-effect transistors (OFETs) exhibited excellent environmental stability as well as a prolonged lifetime even after 500 bending cycles with strain of 2.3%. We expect that our results would be a good reference showing the graphene’s potential as gas barriers for organic electronics.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-6/acsnano.5b01161/production/images/medium/nn-2015-01161h_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b01161'>ACS Electronic Supporting Info</A></P>
ESC, AFS와 AGCS를 이용한 샤시 통합제어시스템 설계
윤경준(Kyoungjun Yoon),이재천(Jaecheon Lee),이규훈(Kyuhoon Lee),황태훈(Taehun Hwang),박기홍(Kihong Park),허승진(Seung-Jin Heo) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The active chassis control systems have been developed with vehicle electronic technology by achieving operating convenience and guaranteeing the stability of the vehicle. However, each controller has been optimized to meet its object according as developing each controller. In this paper, two integrated control logics - one that integrates Electronic Stability Control and Active Geometry Control Suspension and the other that integrates Electronic Stability Control and Active Front Steering - have been developed. The main control target of both logics is vehicle dynamics control under critical situations. The two logics were tested under various driving conditions in a reliable simulation environment and their synergetic effects were investigated. The results indicate that the proposed logics can yield better vehicle performance than the cases when the individual chassis control modules work without any integration scheme.
Feasibility Study of Polymer Gel Dosimetry Using a 3D Printed Phantom for Liver Cancer Radiotherapy
Minsik Lee,Seonyeong Noh,KyoungJun Yoon,Sang-Wook Lee,Sang Min Yoon,Jinhong Jung,Chiyoung Jeong,Jungwon Kwak 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.6
In this study, a new three-dimensional (3D) volumetric dosimetry method utilizing gel dosimetry with a patient-specific (PS) 3D-printed phantom was developed. A PS 3D-printed phantom that closely mimics the actual tumor and surrounding tissues was demonstrated using a 3D printer (3Dison Plus, Lokit, Korea). MAGAT normoxic polymer gel was filled in the tumor-shaped cavity of the 3D-printed phantom to represent the real tumor. Seven identical gel samples for dosimetric calibration were irradiated at different doses and scanned using magnetic resonance imaging. A chlorinated polyethylene filament was utilized as the 3D printing material. The two-dimensional gamma passing rates using the film were 96.1% and 84.3% for the 3%/3 mm and the 2%/1 mm dose accuracy/distance-to agreement criteria, respectively. The radiation dose-R2 (relaxation rate) calibration, with a coefficient of determination (R2) of 0.997, was applied for the absolute dose calibration. The overall gross tumor volume shape and the dose distribution of the gel measurement agreed reasonably well with the plan results. The 3D gamma passing rate was 91.2% for the 3%/3 mm criteria and decreased to 82.3% for the 2%/1 mm criterion. Our results suggest that polymer gel dosimetry with the 3D-printed phantom allows direct validation of the 3D dose distribution.
이종필(JongPil Lee),이경준(Kyoungjun Lee),차헌녕(HonYong Cha),유동욱(Dongwook Yoo),유지윤(JiYoon Yoo) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
현재 대용량의 태양광 발전에 사용되는 정격용량은 250㎾ 급에 이르고 있는데, 단일 인버터로 구성되어 있지 않고 컨버터를 사용하여 구성하는 경우 단일용량으로 컨버터 250kW급을 구현하는 것은 현실적으로 정격 소자, 수동소자와 시스템의 효율 등의 문제로 인하여 그 구현에 현실적인 한계가 있다. 따라서 규격화 된 용량의 단일 전원장치를 병렬 운전함으로써 이와 같은 문제점을 해결할 수 있다. 본 연구에서는 CAN 통신을 이용하여 250㎾ PV PCS에 적용한 DC/DC 컨버터 4대의 병렬운전 기법을 제안하고 실험을 통해 그 우수성을 검증한다.
Lee, Geewon,I, Hoseok,Kim, Seong-Jang,Jeong, Yeon Joo,Kim, In Joo,Pak, Kyoungjune,Park, Do Yun,Kim, Gwang Ha Society of Nuclear Medicine 2014 The Journal of nuclear medicine Vol.55 No.8
<P>This was a study to compare the diagnostic efficacies of endoscopic ultrasonography (EUS), CT, PET/MR imaging, and PET/CT for the preoperative local and regional staging of esophageal cancer, with postoperative pathologic stage used as the reference standard. <B>Methods:</B> During 1 y, 19 patients with resectable esophageal cancer were enrolled and underwent preoperative EUS, CT, PET/CT, and PET/MR imaging. A chest radiologist and nuclear medicine physician retrospectively reviewed the images and assigned tumor and lymph node stages according to the seventh version of the TNM system and the American Joint Committee on Cancer staging system. Four patients who were treated nonsurgically were excluded from data analysis. The efficacies of EUS, CT, PET/CT, and PET/MR imaging were compared. <B>Results:</B> Primary tumors were correctly staged in 13 (86.7%), 10 (66.7%), and 5 (33.3%) patients at EUS, PET/MR imaging, and CT, respectively (<I>P</I> value ranging from 0.021 to 0.375). The accuracy of determining T1 lesions was 86.7%, 80.0%, and 46.7% for EUS, PET/MR imaging, and CT, respectively. For distinguishing T3 lesions, the accuracy was 93.3% for EUS and 86.7% for both PET/MR imaging and CT. For lymph node staging, the accuracy was 83.3%, 75.0%, 66.7%, and 50.0% for PET/MR imaging, EUS, PET/CT, and CT, respectively. In addition, area-under-the-curve values were 0.800, 0.700, 0.629, and 0.543 for PET/MR imaging, EUS, PET/CT, and CT, respectively. <B>Conclusion:</B> PET/MR imaging demonstrated acceptable accuracy for T staging compared with EUS and, although not statistically significant, even higher accuracy than EUS and PET/CT for prediction of N staging. With adjustments in protocols, PET/MR imaging may provide an important role in preoperative esophageal cancer staging in the future.</P>
Pak, Kyoungjune,Cheon, Gi Jeong,Kang, Keon Wook,Chung, June-Key,Kim, E. Edmund,Lee, Dong Soo Lippincott 2015 Clinical nuclear medicine Vol.40 No.1
PURPOSE: We investigated whether SUV parameters, from PET, can provide prognostic information for patients with oropharyngeal or hypopharyngeal cancer. PATIENTS AND METHODS: Forty-eight patients with oropharyngeal or hypopharyngeal cancer who underwent PET before treatment were enrolled. A volume of interest was placed on PET images covering the entire tumor volume and metastatic lymph nodes, and the SUVmax, SUVmean, metabolic tumor volume (MTV), and total lesion glycolysis (TLG) were measured. RESULTS: With the use of Kaplan-Meier analysis, age, SUVmean, MTV, and TLG predicted decreased disease-free survival (DFS). However, SUVmax was not associated with DFS. In multivariate analysis, the variables were included in 3 separate models. An SUVmean2.5 was an independent prognostic factor for DFS. Other SUV parameters, such as MTV and TLG, were associated with trends toward a decreasing DFS. CONCLUSIONS: SUVmean of PET was an independent prognostic factor for DFS in patients with oropharyngeal and hypopharyngeal cancer.