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휴먼형 로봇 손의 사물 조작 수행을 이용한 인간 행동 복제 강화학습 정책 최적화 방법 성능 평가
박나현 ( Na Hyeon Park ),오지헌 ( Ji Heon Oh ),류가현 ( Ga Hyun Ryu ),( Edwin Valarezo Añazco ),( Patricio Rivera Lopez ),원다슬 ( Da Seul Won ),정진균 ( Jin Gyun Jeong ),장윤정 ( Yun Jung Chang ),김태성 ( Tae-seong Kim ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
로봇이 사람과 같이 다양하고 복잡한 사물 조작을 하기 위해서 휴먼형 로봇손의 사물 파지 작업이 필수적이다. 자유도 (Degree of Freedom, DoF)가 높은 휴먼형(anthropomorphic) 로봇손을 학습시키기 위하여 사람 데모(human demonstration)가 결합된 강화학습 최적화 방법이 제안되었다. 본 연구에서는 강화학습 최적화 방법에 사람 데모가 결합된 Demonstration Augmented Natural Policy Gradient (DA-NPG)와 NPG 의 성능 비교를 통하여 행동 복제의 효율성을 확인하고, DA-NPG, DA-Trust Region Policy Optimization (DA-TRPO), DA-Proximal Policy Optimization (DA-PPO)의 최적화 방법의 성능 평가를 위하여 6 종의 물체에 대한 휴먼형 로봇손의 사물 조작 작업을 수행한다. 그 결과, DA-NPG 와 NPG를 비교한 결과를 통해 휴먼형 로봇손의 사물 조작 강화학습에 행동 복제가 효율적임을 증명하였다. 또한, DA-NPG 는 DA-TRPO 와 유사한 성능을 보이면서 모든 물체에 대한 사물 파지에 성공하여 가장 안정적이었다. 반면, DA-TRPO 와 DA-PPO 는 사물 조작에 실패한 물체가 존재하여 불안정한 성능을 보였다. 본 연구에서 제안하는 방법은 향후 실제 휴먼형 로봇에 적용하여 휴먼형 로봇 손의 사물조작 지능 개발에 유용할 것으로 전망된다.
디메틸포름아미드 노출 근로자의 요중 N-메틸포름아미드 분석시 GC-NPD와 GC-FID 방법간 비교
정다운,김현욱 가톨릭대학산업의학센타 산업의학연구소 1999 韓國의 産業醫學 Vol.38 No.1
This purpose of the this study was to compare the results of two analytical techniques, GC-NPD and GC-FID, of quantifying urinary NMF from 70 DMF exposed workers in synthetic resins, leather, and dye manufacturing industries. In addition, the relationship between conecntrations of airborne DMF and urinary NMF was investigated using samples collected from 12 workers. Airborne DMF was sampled using both charcoal and silicagel tubes. All urine specimens were collected both prior-to and at end-of workshifts. The results were as follows: 1. The detection limits of urinary NMF by GC-FID and GC-NPD were 0.043㎎/l and 0.009㎎/l, respectively. The recovery rates were 96.9% for the GC-NPD and 90.2% for the GC-FID methods. 2. Desorption efficiencies of DMF on Charcoal tubes were very poor with 32.96%, while those on silicagel tubes were marginally acceptable with 85.70%. 3. A statistically significant relationship between concentrations of airborne DMF and urinary NMF from 12 workers determined by GC-NPD (r=0.74) and by GC-FID (r=0.67) was observed. 4. Geometric mean concentrations of urinary NMF of the end-of-shift urines from 70 workers were 15.84㎎/g creatinine by GC-NPD and were 9.88㎎/g creatinine by GC-FID, respectivery. For the prior-to-shift samples, they were 6.05 ㎎/g creatinine by GC-NPD and 0.92㎎/g creatinine by GC-FID. These results of this study suggest that for collecting airborne DMF in the workplace, silicagel tubes should be utilized. For quantifying urinary NMF concentrations as a biological marker of DMF exposed workes, urine should be collected at the end-of-shift. Urinary NMF should be analyzed by GC-NPD because of its lower of detection and better precision than that of GC-FID.
Whole-genome resequencing analysis of 20 Micro-pigs
Da‑Hye Son,Nam‑Hyun Hwang,Won‑Hyong Chung,Ha‑Seung Seong,Hyungbum Lim,Eun‑Seok Cho,Jung‑Woo Choi,Kyung‑Soo Kang,Yong‑Min Kim 한국유전학회 2020 Genes & Genomics Vol.42 No.3
Background Miniature pigs have been increasingly used as mammalian model animals for biomedical research because of their similarity to human beings in terms of their metabolic features and proportional organ sizes. However, despite their importance, there is a severe lack of genome-wide studies on miniature pigs. Objective In this study, we performed whole-genome sequencing analysis of 20 Micro-pigs obtained from Medi Kinetics to elucidate their genomic characteristics. Results Approximately 595 gigabase pairs (Gb) of sequence reads were generated to be mapped to the swine reference genome assembly (Sus scrofa 10.2); on average, the sequence reads covered 99.15% of the reference genome at an average of 9.6-fold coverage. We detected a total of 19,518,548 SNPs, of which 8.7% were found to be novel. With further annotation of all of the SNPs, we retrieved 144,507 nonsynonymous SNPs (nsSNPs); of these, 5968 were found in all 20 individuals used in this study. SIFT prediction for these SNPs identified that 812 nsSNPs in 402 genes were deleterious. Among these 402 genes, we identified some genes that could potentially affect traits of interest in Micro-pigs, such as RHEB and FRAS1. Furthermore, we performed runs of homozygosity analysis to locate potential selection signatures in the genome, detecting several loci that might be involved in phenotypic characteristics in Micro-pigs, such as MSTN, GDF5, and GDF11. Conclusion In this study, we identified numerous nsSNPs that could be used as candidate genetic markers with involvement in traits of interest. Furthermore, we detected putative selection footprints that might be associated with recent selection applied to miniature pigs.
행동 복제 강화학습 및 딥러닝 사물 부분 검출 기술에 기반한 사람형 로봇손의 사물 조작
오지헌 ( Ji Heon Oh ),류가현 ( Ga Hyun Ryu ),박나현 ( Na Hyeon Park ),( Edwin Valarezo Añazco ),( Patricio Rivera Lopez ),원다슬 ( Da Seul Won ),정진균 ( Jin Gyun Jeong ),장윤정 ( Yun Jung Chang ),김태성 ( Tae-seong Kim ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
최근 사람형(Anthropomorphic)로봇손의 사물조작 지능을 개발하기 위하여 행동복제(Behavior Cloning) Deep Reinforcement Learning(DRL) 연구가 진행중이다. 자유도(Degree of Freedom, DOF)가 높은 사람형 로봇손의 학습 문제점을 개선하기 위하여, 행동 복제를 통한 Human Demonstration Augmented(DA)강화 학습을 통하여 사람처럼 사물을 조작하는 지능을 학습시킬 수 있다. 그러나 사물 조작에 있어, 의미 있는 파지를 위해서는 사물의 특정 부위를 인식하고 파지하는 방법이 필수적이다. 본 연구에서는 딥러닝 YOLO 기술을 적용하여 사물의 특정 부위를 인식하고, DA-DRL 을 적용하여, 사물의 특정 부분을 파지하는 딥러닝 학습 기술을 제안하고, 2 종 사물(망치 및 칼)의 손잡이 부분을 인식하고 파지하여 검증한다. 본 연구에서 제안하는 학습방법은 사람과 상호작용하거나 도구를 용도에 맞게 사용해야하는 분야에서 유용할 것이다.
Effects of GC7101, a Novel Prokinetic Agent on Gastric Motor Function: Ex Vivo Study
( Da Hyun Jung ),( Eun Ju Choi ),( Han Ho Jeon ),( Young Ho Lee ),( Hyo Jin Park ) 대한소화기기능성질환·운동학회 2014 Journal of Neurogastroenterology and Motility (JNM Vol.20 No.4
Background/Aims GC7101, an extract of Lonicera Flos, is a novel developing drug for reflux esophagitis and functional dyspepsia. However, the drug’s exact pharmacological mechanism of action remains unclear. This study assessed the effects of GC7101 on gastrointestinal (GI) motor function. Methods We used male guinea pigs to evaluate the effects of GC7101 on GI motility. The contraction of antral circular muscle in the presence of different doses of GC7101 was measured in a tissue bath. The prokinetic effects of GC7101 were tested using the charcoal transit assay from the pylorus to the most distal point of migration of charcoal mixture. To clarify the mechanism of action of GC7101, atropine, dopamine and the selective 5-hydroxytryptamine 4 receptor antagonist, GR113808 were used. Results The maximal amplitude of circular muscle contraction was induced by 5 mg mL.1 GC7101. The area under the curve of contraction was significantly increased at 5 mg mL.1 GC7101. Addition of 10.6 M atropine, 10.8 M dopamine or 10.7 M GR 113808 to GC7101 5 mg mL.1 decreased the amplitude and area under curve compared to GC7101 5 mg mL.1 alone. GC7101 accelerated GI transit in a dose dependent manner except 100 mg kg.1. Delayed GI transit caused by atropine, dopamine and GR 113808 was restored by GC7101 50 mg kg.1. Conclusions GC7101, an extract of Lonicera Flos, exerts a gastric prokinetic effect in guinea pig through cholinergic, antidopaminergic and serotonergic mechanisms. Therefore, GC7101 might be a novel drug for the treatment of functional dyspepsia. (J Neurogastroenterol Motil 2014;20:469-474)
Da-Woon Leem,Hyun-Ju Jung,Moon-Sung Hwang,Jung-Ah Shim,Hyun-Jung Kwon 보안공학연구지원센터 2016 International Journal of Software Engineering and Vol.10 No.3
As a variety of services are provided through mobile devices, there have been increasing security threats to mobile platforms and applications. Many mobile application security check methodologies are proposed to deal with such threats, but it is not clear exactly how the security vulnerabilities are inspected, and there is no correct methodology for such. One way to increase the execution rate of vulnerability check is to develop an automation tool that simplifies the process. Therefore, in this study, a work process of Android application vulnerability inspection was designed and a prototype of the automation tool for vulnerability inspection was implemented. Furthermore, the effectiveness of the implemented prototype was assessed through an actual application using the prototype.
Jung, Da Hyun,Youn, Young Hoon,Kim, Jie-Hyun,Park, Jae Jun,Park, Hyojin Baishideng Publishing Group Inc 2018 WORLD JOURNAL OF GASTROENTEROLOGY Vol.24 No.33
<P><B>AIM</B></P><P>To investigate the feasibility and safety of secondary endoscopic submucosal dissection (ESD) for residual or locally recurrent gastric tumors.</P><P><B>METHODS</B></P><P>Between 2010 and 2017, 1623 consecutive patients underwent ESD for gastric neoplasms at a single tertiary referral center. Among these, 28 patients underwent secondary ESD for a residual or locally recurrent tumor. Our analysis compared clinicopathologic factors between primary ESD and secondary ESD groups.</P><P><B>RESULTS</B></P><P>The en bloc resection and curative rate of resection of secondary ESD were 92.9% and 89.3%, respectively. The average procedure time of secondary ESD was significantly longer than primary ESD (78.2 min <I>vs</I> 55.1 min, <I>P</I> = 0.004), and the adverse events rate was not significantly different but trended slightly higher in the secondary ESD group compared to the primary ESD group (10.7% <I>vs</I> 3.8%, <I>P</I> = 0.095). Patients who received secondary ESD had favorable outcomes without severe adverse events. During a mean follow-up period, no local recurrence occurred in patients who received secondary ESD.</P><P><B>CONCLUSION</B></P><P>Secondary ESD of residual or locally recurrent gastric tumors appears to be a feasible and curative treatment though it requires greater technical efficiency and longer procedure time.</P>
( Hyun-Joon Park ),( Da-Jung Kim ),( Kyoung-Im Cho ),( Jin-Wook Lee ),( Sun-Min Kim ),( Hyun-Su Kim ),( Jung Ho Heo ) 대한내과학회 2015 대한내과학회 추계학술대회 Vol.2015 No.1
Background: Epicardial fat tissue has unique endocrine and paracrine functions that affect the cardiac autonomic system. Heart rate recovery (HRR) is a simple non-invasive measurement that assesses autonomic nervous system dysfunction. We aimed to investigate the association between epicardial fat thickness (EFT) and HRR in patients with hypertension according to circadian blood pressure (BP) variation. Methods: A total of 358 consecutive patients who underwent both 24-hour ambulatory BP monitoring (ABPM) and a treadmill test were enrolled. Echocardiographic EFT and HRR, defined as peak heart rate minus heart rate after a 1-minute recovery time, were measured. Patients were classified according to the ABPM; 147 patients with hypertension with a dipping pattern at night (dippers), 140 patients with hypertension with a non-dipping pattern at night (non-dippers) and 71 normotensive controls. Results: EFT was significantly higher in hypertensive patients, especially in the non-dipper group, compared to the controls (non-dippers, 7.5 ± 2.9 mm; dippers, 6.6 ± 1.6 mm; controls, 5.5 ± 2.1 mm; p<0.001). HRR was significantly lower in both hypertensive groups as compared to the control group and was the lowest in the non-dipper group (non-dipper, 26.6 ± 18.6; dipper, 29.5 ± 21.5; control, 71.4 ± 19.8; p<0.001). EFT was significantly correlated with age, body mass index, 24-hour mean systolic BP and 24 hours mean BP variability, whereas exercise duration, metabolic equivalents (METs) and HRR were inversely correlated with EFT. Furthermore, EFT>6.7 mm was associated with a blunted HRR with 76% sensitivity and 61% specificity (ROC area under curve: 0.71, 95% confidence interval, CI=0.65-0.76, p<0.001). In a multivariate analysis, EFT (odds ratio, OR =3.53, 95% CI=1.20-10.37, p=0.022) and 24-hour mean BP variability (OR=1.09, 95% CI=1.03-1.16, p=0.005) were independent predictors of a blunted HRR defined as HRR ≤12 beats (n=63) in patients with hypertension. Conclusions: EFT and circadian BP variability were independent predictors of blunted HRR in patients with hypertension, which suggests a link between epicardial fat and autonomic dysregulation in hypertension.