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안상태,강국정,홍석균,Ahn, Sang-Tae,Kang, Kuk-Jung,Hong, Suk-Kyun 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.3
The necessity for harmonically growing of economy and environment has been on the rise late in the twentieth century. Green transformation is defined as efficiency enhancement of conventional guns and ammunitions. We also define green innovation as evolution of fire power systems breaking with conventional methodology. This kind of green innovation could even change a paradigm of warfare in the future. In this paper, we classify the green technology in the field of fire power into five technological groups, and the research and development trend of green technology in the field of fire power is analyzed.
A Study on Analysis and Experiment of Composite Overwrapped Barrel
Ahn Sang Tae(안상태),Gimm Hak In(김학인),Kang Kuk Jung(강국정) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7
SAFE is the abbreviation of operational procedure of weapon systems; see, aim, fire and eliminate. Reduction of weight of weapon systems helps obtain better performance on the steps of "aim" and "fire" out of the four steps. High strength steels have been normally used for conventional large caliber weapon systems. For the purpose of lightweight large caliber weapons, various materials could be concerned such as aluminum alloys, titanium alloys and advanced composite materials. By using composite materials for gun tubes, some benefits could be achieved. First, it basically helps reduce the overall weight of the weapon system as well as that of the gun tube itself. Second, smaller drive systems may be used. Third, better aiming accuracy could be achieved. As the first stage of the development of full scale gun tube with composite materials, a subscale thick-walled cylinder was manufactured and tested.
연식주퇴 포신고정장치의 충격하중에 대한 구조/동특성 해석
김흥태(Heung-Tae Kim),이영신(Young-Shin Lee),양태호(Tae-Ho Yang),전상배(Sang Bae Jun),이규섭(Kyu Sub Lee),강국정(Kuk Jeong Kang),안상태(Sang Tae Ahn) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The recoiling parts are initially accelerated to the forward direction prior to the firing. The gun was fired when recoiling parts was been attained predeterminated velocity. The recoil force then reverses the motion of the recoiling mass and the recoiling parts are returned to their initial position. The latch system of soft recoil system was received the high impact load as the recoil part was accelerated in the direction of projectile travel. In this study, damage on the latch of soft recoil system under impact evaluated for located the battery position, and mechanism of the latch was simulated.
이동 로봇의 강인 위치 추정을 위한 단안 비젼 센서와 레이저 구조광 센서의 베이시안 센서융합
김민영(Min Young Kim),안상태(Sang Tae Ahn),조형석(Hyungsuck Cho) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.4
This paper describes a procedure of the map-based localization for mobile robots by using a sensor fusion technique in structured environments. A combination of various sensors with different characteristics and limited sensibility has advantages in view of complementariness and cooperation to obtain better information on the environment. In this paper, for robust self-localization of a mobile robot with a monocular camera and a laser structured light sensor, environment information acquired from two sensors is combined and fused by a Bayesian sensor fusion technique based on the probabilistic reliability function of each sensor predefined through experiments. For the self-localization using the monocular vision, the robot utilizes image features consisting of vertical edge lines from input camera images, and they are used as natural landmark points in self-localization process. However, in case of using the laser structured light sensor, it utilizes geometrical features composed of corners and planes as natural landmark shapes during this process, which are extracted from range data at a constant height from the navigation floor. Although only each feature group of them is sometimes useful to localize mobile robots, all features from the two sensors are simultaneously used and fused in term of information for reliable localization under various environment conditions. To verify the advantage of using multi-sensor fusion, a series of experiments are performed, and experimental results are discussed in detail.
자궁내막증 여성에서 증가된 자궁내막용종의 빈도; 질환의 중증도와의 관련성
장혜진,황경주,김미란,안상태,변재광,이은희,박진영,Chang, Hye Jin,Hwang, Kyung Joo,Kim, Mi Ran,Ahn, Sang Tae,Byun, Jae Guang,Lee, Eun Hee,Park, Jin Young 대한생식의학회 2006 Clinical and Experimental Reproductive Medicine Vol.33 No.3
목 적: 자궁내막증에서 발견되는 자궁내막용종의 발생빈도와 자궁내막증 질환의 중증도와의 연관성에 대해 알아보고자 한다. 연구방법: 불임, 심한 월경통, 난소종양 등을 주소로 복강경 수술이 필요했던 여성 631명을 대상으로 하였다. 복강경 수술로 확인된 자궁내막증을 가진 434명과 자궁내막증이 없었던 197명의 여성에서 자궁내시경을 이용한 조직학적인 검사를 통해 자궁내막용종의 발생 빈도를 비교하였다. 또한 자궁내막증 질환의 중증도는 American Fertility Society classification 에 따라 나누었고, 그에 따른 자궁내막용종의 빈도를 비교하였다. 결 과: 자궁내막증을 가진 군 (434명)과 정상 대조군 (197명) 간에 나이, 불임기간, 호르몬 수치 등의 임상적인 차이는 보이지 않았고, 자궁내막용종은 자궁내막증을 가진 여성에서는 274명 (63%)에서 관찰되었고, 자궁내막증이 없는 대조군에서는 58명 (29.8%)에서 관찰되었다(p=0.001). 자궁내막증 1기와 2기에서는 자궁내막용종이 동반된 경우가 각각 54.2%와 64.4% 이었으나, 자궁내막증 3기와 4기에서는 67.6%와 70.2%로 통계적으로 유의하게 정상 대조군에 비해 자궁내막용종의 동반 확률이 높았고, 자궁내막증 중증도에 따라 자궁내막용종의 빈도가 유의하게 증가하는 양상을 보였다(p=0.008). 결 론: 자궁내막증을 가진 여성에서 자궁내막용종을 동반할 확률이 정상인에 비해 높았고, 중증 자궁내막증일수록 동반되는 자궁내막용종의 빈도가 증가하였다. Objective: The aim of this study was to evaluate the correlation between severity of endometriosis and the incidence of endometrial polyp. Methods: The study population consisted of six hundred thirty-one women who had undergone laparoscopic operation due to infertility, severe dysmenorrhea or ovarian tumors. We divided two groups: 434 women with endometriosis (study group) and 197 women without the disease (control group). The presence of endometriosis was documented by diagnostic or therapeutic laparoscopic operation and the disease severity was scored according to revised The American Fertility Society classification. We confirmed the endometrial polyps by pathologic examination after hysteroscopic polypectomy, and compared endometrial polyp incidence according to severity of endometriosis. Results: There was no significant difference between groups with regard to age, mean duration of infertility. Endometrial polyps were found in 274 women (63.0%) with endometriosis and in 58 controls (29.8%, p=0.0000). The incidence of endometrial polyps differed significantly according to stage of endometriosis. The incidence of endometrial polyps were 77/142 (54.2%), 58/90 (64.4%), 73/108 (67.6%, p<0.05), 66/94 (70.2%, p<0.05) in endometriosis stage I, II, III, and IV. There was a linear correlation between stage of endometriosis and endometrial polyps incidence (p=0.008). Conclusion: Endometriosis is accompanied by endometrial polyps. This results showed positive correlation between severity of the endometriosis and incidence of endometrial polyps. It is the possible mechanism for low pregnancy rate in the severe endometriosis.
박선영,배재성,황재혁,강국정,안상태,Park, Sun-Young,Bae, Jae-Sung,Hwang, Jai-Hyuk,Kang, Kuk-Jeong,Ahn, Sang-Tae 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.6
A soft-recoil or FOOB (Fire-Out-Of-Battery) system can reduce the recoil force considerably. Its firing sequency is different from that of a conventional or FIB (Fire-In-Battery) system. In FOOB system, the gun is latched and preloaded in its battery position prior to firing. When unlatched, the gun is accelerated to the forward direction and then the forward momentum of the recoil part is generated. Since this momentum reduces the recoil impulse, the recoil force will decrease significantly. When designing the soft-recoil system it is important to design the forward momentum profile of a recoiling part. In the present study, the method to determine the forward momentum has been studied and its optimum value has been obtained theoretically. The numerical simulation of the soft-recoil system is performed to show that the present soft-recoil system works functionally well.