강화학습의 PPO 알고리즘을 적용한 협업운송 Multi-Robot System

이시현,이귀형 제어로봇시스템학회 2022 제어로봇시스템학회 국내학술대회 논문집 Vol.2022 No.6

$Nios^{(R)}$ II 임베디드 프로세서를 사용한 병렬처리 시스템의 설계 및 구현

이시현,Lee, Si-Hyun 한국컴퓨터정보학회 2009 韓國컴퓨터情報學會論文誌 Vol.14 No.11

In this thesis, we discuss the implementation of parallel processing system which is able to get a high degree of efficiency(size, cost, performance and flexibility) by using $Nios^{(R)}$ II(32bit RISC(Reduced Instruction Set Computer) processor) embedded processor in DE2-$70^{(R)}$ reference board. The designed Parallel processing system is master-slave, shared memory and MIMD(Mu1tiple Instruction-Multiple Data stream) architecture with 4-processor. For performance test of system, N-point FFT is used. The result is represented speed-up as follow; in the case of using 2-processor(core), speed-up is shown as average 1.8 times as 1-processor's. When 4-processor, the speed-up is shown as average 2.4 times as it's.

Methyl 5-aminolevulinic Acid를 이용한 발톱진균증의 광역동치료: 효과와 안전성

이시현,안지영,박미연 대한의진균학회 2012 대한의진균학회지 Vol.17 No.1

Background: The major limitations of the current therapeutic treatments for onychomycosis are the recurrence of the infection and the duration of the treatment. Recently, photodynamic therapy (PDT) is thought to be a novel alternative method for treatment of onychomycosis. Objective: The aim of this study is to investigate the efficacy and safety of PDT with methyl 5-aminolevulinic acid (MAL) for the treatment of onychomycosis. Methods: We performed MAL-PDT in eight patients with distal subungual onychomycosis on at least one great toenail. After the total three treatments, we observed the clinical and mycological courses for twelve months. Results: For the twelve months of follow-up period, three patients (37.5%) showed continuous clinical improvement, two patients (25%) aggravation after transient improvement, and the rest, three patients (37.5%) resistance to treatment. All subjects complained of quite severe burning pain during irradiation of light source. Conclusion: In this study, we observed the highly variable clinical and mycological results of PDT in onychomycosis. We concluded that it is too difficult to consistently achieve the best fungicidal effect by PDT without strictly selected conditions. Background: The major limitations of the current therapeutic treatments for onychomycosis are the recurrence of the infection and the duration of the treatment. Recently, photodynamic therapy (PDT) is thought to be a novel alternative method for treatment of onychomycosis. Objective: The aim of this study is to investigate the efficacy and safety of PDT with methyl 5-aminolevulinic acid (MAL) for the treatment of onychomycosis. Methods: We performed MAL-PDT in eight patients with distal subungual onychomycosis on at least one great toenail. After the total three treatments, we observed the clinical and mycological courses for twelve months. Results: For the twelve months of follow-up period, three patients (37.5%) showed continuous clinical improvement, two patients (25%) aggravation after transient improvement, and the rest, three patients (37.5%) resistance to treatment. All subjects complained of quite severe burning pain during irradiation of light source. Conclusion: In this study, we observed the highly variable clinical and mycological results of PDT in onychomycosis. We concluded that it is too difficult to consistently achieve the best fungicidal effect by PDT without strictly selected conditions.

조갑백선에 대한 광역동치료(photodynamic therapy)의 효과와 안정성 평가 (초)

이시현,김민수,이정연,최연진,박미연,안지영 대한피부과학회 2010 초록집 Vol.48 No.20

피부의 방추상 세포 편평세포암 1예 (초)

이시현,정혜정,김민수,이정연,채웅석,이단비,최유성,서호석,안지영,박미연 대한피부과학회 2011 초록집 Vol.49 No.10

객체지향형 언어를 사용한 LAN 기반의 TCP/IP 프로토콜 분석기 구현

이시현,강정진,장학신,조병순,최규민,정중수 대한전자공학회 2000 電子工學會論文誌 IE (Industry electronics) Vol.37 No.3

본 논문에서는 윈도우 환경에서 객체지향언어(Object-Oriented Programming)를 사용하여 LAN(Local Area Network) 기반의 TCP/IP(Transmission Control Protoco/Internet Protocol) 프로토콜을 분석할 수 있는 프로토콜 분석기를 개발하였다. TCP/IP 프로토콜 분석기는 윈도우 98/NT 환경에서 VC++ 6.0을 사용하여 프로토콜을 분석할 수 있도록 인터페이스 카드, 모니터 및 에뮬레이션 소프트웨어와 GUI(Graphic User Interface)를 개발하였다. 프로토콜 분석 소프트웨어는 네트워크에서 수집(capture)되는 정보를 실시간으로 분석할 수 있도록 실시간 객체(Real-Time Object)를 사용하였고, 모니터링 기능과 에뮬레이션 기능을 제공하도록 설계하였다. 성능시험 결과 LAN 기반에서 프레임 에러(frame error) 없이 TCP/[P 프로토콜 데이터를 실시간으로 수집하고 분석할 수 있음을 보였다. 본 연구에서 개발된 프로토콜 분석기는 기존의 프로토콜 분석기보다 안정적이고 다양한 결과를 보였으며, 통신 및 네트워크 분야의 개발용으로 사용될 수 있으므로 수입대체 효과를 가져 을 수 있다. In this paper, we develop protocol analyzer that can analyze and monitor LAN(Local Area Network)-based TCP/IP protocol using the OOP(object-oriented programming) in Windows98/NT environment. TCP/IP(Transmission Control Protocol/Internet Protocol) protocol analyzer is consist of interface hardware, protocol analysis software and GUI(Graphic User Interface). It is designed for the real-time analysis using the real-time object. In results of Performance test, TCP/IP Protocol analyzer is showed that it can analyze and monitor without frame error in LAN-based. Also, developed protocol analyser operates better than conventional protocol analyzer in performance. It can be used in maintenance fields of communication and network.

전문상담사 자격을 위한 초심상담자의 내담자 경험에 관한 연구

이시현 한국상담학회 2018 한국상담학회 학술대회 논문집 Vol.2018 No.8

K-Dancecal 운영단체의 확장성을 통한 레퍼토리 확보와 창작 활성화를 위한 질적사례연구

이시현,안병순 한국무용학회 2022 한국무용학회지 Vol.22 No.2

본 연구는 국내 민간무용단체의 댄스컬작품 제작사례를 분석하여 공연제작 현황을 파악하고 댄스컬 작품제작을 위한 자생력 확보와 운영비전을 제시하는데 있다. 연구방법은 2개의 순수민간무용단체의 댄스컬 제작지원과 작품제작 과정의 내용분석을 토대로 전문가 토론과 심층리뷰를 통한 영역분석을 실시하였다. 연구결과 민간무용단체의 활성화를 위한 선행과제로 세 가지 유형으로 제시되었다. 첫째, 민간무용단체의 지원과 제작시스템 개선을 통한 장르 레퍼토리 확장성. 둘째, 댄스컬 제작 시스템의 다변화와 안무와 연출 및 스텝 영역의 전문성과 실천적인 비전. 셋째, 한국형 댄스컬 제작과 보급을 위한 K-Dancecal의 확장성이 필요하다. 이러한 과제 수행을 통해 K-Dancecal 정착을 위한 전문가 영역의 시스템 확보와 대중적 영역의 확장성을 통한 독창성 및 자생력 확보의 기반 형성을 이룰 수 있을 것으로 기대된다.

The Impedance Analysis of Multiple TSV-to-TSV

이시현,Lee, Sihyun The Institute of Electronics and Information Engin 2016 전자공학회논문지 Vol.53 No.7

In this paper, we analyze the impedance analysis of vertical interconnection through-silicon vias (TSV) that is being studied for the purpose of improving the degree of integration and an electric feature in 3D IC. Also, it is to improve the performance and the degree of integration of the three-dimensional integrated circuit system which can exceed the limits of conventional two-dimensional a IC. In the future, TSV technology in full-chip 3-dimensional integrated circuit system design is very important, and a study on the electrical characteristics of the TSV for high-density and high-bandwidth system design is very important. Therefore, we study analyze the impedance influence of the TSV in accordance with the distance and frequency in a multiple TSV-to-TSV for the purpose of designing a full-chip three-dimensional IC. The results of this study also are applicable to semiconductor process tools and designed for the manufacture of a full-chip 3D IC. 본 논문에서는 기존의 2D IC의 성능을 개선하고 3D IC의 집적도와 전기적인 특성을 개선하기 위한 목적으로 연구되고 있는 TSV (Through Silicon Via)의 임피던스를 해석하였다. 향후 Full-chip 3D IC 시스템 설계에서 TSV는 매우 중요한 기술이며, 높은 집적도와 광대역폭 시스템 설계를 위해서 TSV에 대한 전기적인 특성에 관한 연구가 매우 중요하다. 따라서 본 연구에서는 Full-chip 3D IC를 설계하기 위한 목적으로 다중 TSV-to-TSV에서 거리와 주파수에 따른 TSV의 임피던스 영향을 해석하였다. 또한 이 연구 결과는 Full-chip 3D IC를 제조하기 위한 반도체 공정과 설계 툴에 적용할 수 있다.

Ultrasonographic Evaluation of Renal Cortex and Outer Medulla Thickness in Dogs with Chronic Kidney Disease

이시현,홍성균,김혜진,오다영,김승지,전상경,최민철,윤정희 한국임상수의학회 2017 한국임상수의학회지 Vol.34 No.3

This study was performed to retrospectively pursue any correlation between renal cortex thickness (RCT), outer medulla thickness (OMT) on ultrasonography (US) and chronic kidney disease (CKD) with International Renal Interest Society (IRIS) stage. Medical records and US findings of the dogs diagnosed CKD were reviewed for comparing to those of the clinically healthy dogs from March. 2015 through June. 2016. To evaluate the correlation about normal and CKD patients, RCT and the OMT were measured on US images. RCT and OMT were adjusted by dividing body surface area for standardization (RCTS, OMTS). Also the ratio of RCT/OMT were calculated and these indices were evaluated to investigate any tendency between 5 groups (normal and 4 IRIS stages) using Jonckheere-Terpstra trend test (J-T test). The RCTS showed a declining tendency (p < 0.02) and the OMTS showed an inclining tendencyfrom normal through each IRIS stage (p < 0.01). The RCT/OMT showed also declining tendency (p < 0.01). Although the gold standard for renal function including GFR is lack, it is thought that differentiation between normal and CKD patients could be possible on US measurement of renal cortex and outer medulla thickness, which could be an alternative index for kidney function in diagnostic imaging.