부고환 및 고환 정자를 이용한 세포질내 정자주입술에 관한 임상 연구

이영일,정병준,이상훈,김영선,Lee, Young-Il,Jung, Byeong-Jun,Lee, Sang-Hoon,Kim, Young-Sun 대한생식의학회 1999 Clinical and Experimental Reproductive Medicine Vol.26 No.3

Objective: The purpose of this study was to evaluate outcome of intracytoplasmic sperm injection (ICSI) using epididymal and testicular sperm in patients with azoospermia. Methods: From March, 1993 to May, 1999, a retrospective clinical analysis was done of a total of 140 cycles in 112 patients who underwent ICSI. Subjects were divided into three groups: ejaculated-ICSI group included 42 cycles in 34 patients with ejaculated sperm who underwent ICSI due to severe oligospermia and past history of failed or poor fertilization in the previous in vitro fertilization and embryo tranfer (IVF-ET) cycles, microsurgical epididymal sperm aspiration and intracytoplasmic sperm injection (MESA-ICSI) group included 50 cycles in 42 patients with congenital absence of the vas deferens (CAVD) or unreconstructable obstructive azoospermia and testicular sperm extraction and intracytoplasmic sperm injection (TESE-ICSI) group included 48 cycles in 36 patients with no spermatozoa which can be retrieved from epididymis or non-obstructive azoospermia. Results: Normal two-pronuclear fertilization rates were similar in three groups: 64.4% for ejaculated-ICSI group, 59.4% for MESA-ICSI group and 60.4% for TESE-ICSI group. The pregnancy rates were 26.2%, 26.0% and 25.0% respectively. There were no significant differences in the fertilization, cleavage, and clinical pregnancy rates among ICSI cycles using ejaculated, epididymal and testicular sperm. Conclusion: Epididymal and testicular sperm obtained in azoospermic patients can fertilize oocyte successfully and may lead to be similar fertilization rates and clinical pregnancy rates to ejaculated sperm.

황련뿌리 추출물성분이 흰쥐의 지질대사에 미치는 효과

이영일,이상영,최용순,Lee, Young-Il,Lee, Sang-Young,Choi, Yong-Soon 한국생약학회 1996 생약학회지 Vol.27 No.3

Coptis rhizoma was extracted with methanol or hot water. Methanol extracts had higher berberine content than water extracts, whereas the contents of Ca, Mg, Zn and K were higher in the water extracts. Rats were fed on the purified diets rich in 0.12% cholesterol only or supplemented with 0.5% of each extracts for four weeks. The concentration of total serum cholesterol was significantly lower in the rats given the extracts, irrespective of the extractants. Although the concentration of serum HDL-cholesterol was comparable among the groups, the ratio of HDL-/total-cholesterol was higher in rats given the extracts. The concentration of serum free fatty acids and ketone body were significantly elevated in rats given the extracts. On the other hand, the extracts supplements significantly decreased the contents of liver cholesterol and triacylglycerol. The amount of fecal bile acids was markedly higher in rats given the extracts, especially in those given water extracts. The results show an effective hypocholesterolemic action of Coptis rhizoma and it seems that the lower concentration of serum and liver cholesterol is resulted from the increased fecal bile acids in rats.

무인차량의 주행성분석을 위한 방향별 속도지도 생성

이영일,이호주,지태영,Lee, Young-Il,Lee, Ho-Joo,Jee, Tae-Young 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.5

One of the basic technology for implementing the autonomy of UGV(Unmanned Ground Vehicle) is a path planning algorithm using obstacle and raw terrain information which are gathered from perception sensors such as stereo camera and laser scanner. In this paper, we propose a generation method of DVGM(Directional Velocity Grid Map) which have traverse speed of UGV for the five heading directions except the rear one. The fuzzy system is designed to generate a resonable traveling speed for DVGM from current patch to the next one by using terrain slope, roughness and obstacle information extracted from raw world model data. A simulation is conducted with world model data sampled from real terrain so as to verify the performance of proposed fuzzy inference system.

모바일 단말정보 저장소 시스템

이영일,인민교,이강찬,이승윤,김창수,정회경,Lee, Young-Il,In, Min-Kyo,Lee, Kang-Chan,Lee, Seung-Yun,Kim, Chang-Su,Jung, Hoe-Kyung 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.11

Due to the improvement of mobile device capabilities, a demand for various contents service is increasing. But the differences from heterogeneous mobile devices force to develop contents which is dependent on a mobile. To solve this problem, adaptation course that reorganize contents by the device capability is hooded. In this course, device description is described using device description language but there are some problems that is absence of device description repository and the way to get device description data. In this paper, I suggest device description acquisition module and define the interfaces to access device description repository that I designed and implemented. 모바일 단말의 성능 향상으로 다양한 콘텐츠 서비스에 대한 요구가 증대되고 있다. 하지만 이기종 모바일 단말간의 콘텐츠 표현성능이 하드웨어나 소프트웨어 등의 측면에서 차이가 있어 단말에 종속적인 콘텐츠 개발을 강요하게 된다. 이를 해결하기 위해서는 콘텐츠를 단말의 성능에 맞추어 재구성하는 적응화(Adaptation)과정이 필요하다. 이때 적응화 과정에서 사용되는 단말의 성능 정보를 단말정보 표현 언어를 통해 기술하는데, 이 단말정보 데이터를 저장하고 콘텐츠 제공 서버(Contents Provider)에 제공해 주는 역할을 하는 단말정보 저장소 시스템(Device Description Repository)의 부재 및 단말정보 데이터의 확보가 요구된다. 이에 본 논문에서는 단말정보 데이터를 확보하기 위해 단말정보의 변환 방법을 제시하고 단말정보 저장소 시스템에 접근하기 위한 표준 인터페이스를 확장하여 정의하였으며, 이를 기반으로 단말정보 저장소 시스템을 설계 및 구현하였다.

무인차량의 주행성능을 고려한 장애물 격자지도 기반의 지역경로계획

이영일,이호주,고정호,Lee, Young-Il,Lee, Ho-Joo,Ko, Jung-Ho 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.2

A fundamental technology of UGV(Unmanned Ground Vehicle) to perform a given mission with success in various environment is a path planning method which generates a safe and optimal path to the goal. In this paper, we suggest a local path-planning method of UGV based on the binary map using world model data which is gathered from terrain perception sensors. In specially, we present three core algorithms such as shortest path computation algorithm, path optimization algorithm and path smoothing algorithm those are used in the each composition module of LPP component. A simulation is conducted with M&S(Modeling & Simulation) system in order to verify the performance of each core algorithm and the performance of LPP component with scenarios.

DSP 프로세서를 이용한 실시간 ANC 시스템 구현에 관한 연구

이영일,최홍섭,Lee Young Il,Choi Hong Sub 대한음성학회 2004 말소리 Vol.52 No.-

This paper is aiming at real-time implementation of adaptive noise cancellation system using DSP processor. ACHARF algorithm, which guarantees stability and fast convergence by adaptive compensator, is used on this DSP system. For the experiments, TLV320AIC23 stereo CODEC of TI Inc. is used with TMS320C6413 DSP processor. Signals of primary input and reference input are obtained by two microphones. The primary input is the voice plus noise signal and the reference input is white noise or real noise. The experimental results show that ANC system using DSP processor with ACHARF is verified to be an effective speech enhancement method for various speech processing units.

점토 광물 조성이 점토기반 분리막의 곡강도에 미치는 영향

이영일,엄정혜,김영욱,송인혁,Lee, Young-Il,Eom, Jung-Hye,Kim, Young-Wook,Song, In-Hyuck 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.5

Clay-based membranes with submicron pore size were successfully prepared by a simple pressing process using low-cost starting materials(e.g., kaolin (K), bentonite (B), talc (T), and sodium borate). The green bodies were sintered at $1000^{\circ}C$ for 2 h in air. The effect of clay-mineral composition on the flexural strength of clay-based membranes was investigated. The porosity of the clay-based membranes could be controlled within the range of 34 - 42% by adjusting the starting composition. The flexural strength of the low-cost membranes depended on both the porosity and the ${\alpha}$-quartz content. In turn, the porosity and ${\alpha}$-quartz content were affected by the (B+T) /(K+B+T) ratio. The plot of strength relative to this ratio, showed a maximum when the ratio was 0.4. The typical flexural strength of these clay-based membranes (with ratio 0.4) was 28 MPa at 34% porosity.

무인차량의 자율주행을 위한 지역경로계획 매니저

이영일,이호주,박용운,Lee, Young-Il,Lee, Ho-Joo,Park, Yong-Woon 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.6

The Mission environment of UGV(Unmanned Ground Vehicle) has a complexity and variety, and the status of system and sensor is dependent on the environment factors such as operation time, the weather and road type. It is necessary for UGV to cope adaptively with the various mission types, operation modes and operation environment as human operators do. To satisfy this necessity, we present an autonomy manager based on the autonomous architecture. In this paper, we design a path planning software architecture and LPP manager by using open autonomous architecture which is previously designed by ADD. Field test is conducted with UGV in order to verify the performance of LPP Manager based on the Autonomous Architecture with scenarios.

퍼지관계곱을 이용한 수중운동체의 고수준 자율항행기법

이영일,김용기,Lee, Young-Il,Kim, Yong-Gi 한국정보과학회 2002 정보과학회논문지 : 소프트웨어 및 응용 Vol.29 No.1

This paper describes a heuristic search technique carrying out collision avoidance for Autonomous Underwater Vehicles(AUVs). Fuzzy relational products are used as the mathematical implement for the analysis and synthesis of relations between obstacles that are met in the navigation environment and available candidate nodes. In this paper, we propose a more effective evaluation function that reflects the heuristic information of domain experts on obstacle clearance, and an advanced heuristic search method performing collision avoidance for AUVs. The search technique adopts fuzzy relational products to conduct path-planning of intelligent navigation system. In order to verify the performance of proposed heuristic search, it is compared with $A^*$ search method through simulation in view of the CPU time, the optimization of path and the amount of memory usage. 본 논문에서는 자율수중운동체(AUVs, Autonomous Underwater Vehicles)의 실시간 충돌회피를 위한 휴리스틱 탐색기법을 논한다. 퍼지관계곱(fuzzy relational products)은 항행 환경에서 발생하는 장애물과 다음으로 이동 가능한 후보노드들과의 관계를 분석, 종합하는 수학적 도구로 사용된다. 본 논문은 영역전문가 보유한 장애물회피 관련 경험적 정보(heuristic information)를 반영하여 보다 효율적인 평가함수(evaluation function)를 고안하며 지능항행시스템의 상세경로설정(local path-planning)에 퍼지관계곱을 적용하여 보다 개선된 휴리스틱 탐색기법을 제안한다. 제안된 탐색기법의 성능검증을 위해 수행시간(cpu time), 경로의 최적화(optimization) 정도, 그리고 사용 메모리 관점에서 시뮬레이션을 통해 $A^{*}$ 탐색기법과 비교한다.

Modified $A^*$ - 방향별 속도지도를 활용한 무인차량의 지역경로계획

이영일,이호주,박용운,Lee, Young-Il,Lee, Ho-Joo,Park, Yong-Woon 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.3

It is necessary that UGV(Unmanned Ground Vehicle) should generate a real-time travesability index map by analyzing raw terrain information to travel autonomously tough terrain which has various slope and roughness values. In this paper, we propose a local path planning method, $MA^*$(Modified $A^*$) algorithm, using DVGM (Directional Velocity Grid Map) for unmanned ground vehicle. We also present a path optimization algorithm and a path smoothing algorithm which regenerate a pre-planned local path by $MA^*$ algorithm into the reasonable local path considering the mobility of UGV. Field test is conducted with UGV in order to verify the performance of local path planning method using DVGM. The local path planned by $MA^*$ is compared with the result of $A^*$ to verify the safety and optimality of proposed algorithm.