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강판-콘크리트 구조 벽체-지지대 접합부의 거동특성에 관한 연구
김강식,김우범,이정민 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
An experimental and analytical study on the behavior of SC(steel plate - concrete) structure's wall-support joint for nuclear power plants was performed. Nine full scale specimens were tested with horizontal monotonic load, all acting in the same plane causing uni-axial moment on the SC structure's wall-support beam joint. The major focus relates to the identification of the behavior and capacity of the SC composite joint system. The effects of variations of the location of support, the thickness of steel-plate and the depth of support were studied. The horizontal force-displacement relationship, steel-plate strains, plate deformation, support strains were observed and analyzed in order to evaluate the behavior of the system.
객체지향 데이터베이스 시스템에서의 다단계 보안 모델들의 비교
심갑식,김강철 진주산업대학교 1997 論文集 Vol.36 No.-
This paper briefly describes the main proposals to enforce security in Object-Oriented DBMS(OODBMS) by using mandatory policy. It first provides an overview of object-oriented database. Then discussions of mandatory security models for object-oriented database. Then discussions of mandatory security models for object-oriented systems are given. The mandatory classifications used in those models and the relationship between them are the same as those illustrated for the Bell-LaPadula model, on which all those models are based.
마이크로봇 로봇을 응용한 정보통신 창업교육 시스템 연구
이강환 ; 김영태 ; 윤경식 김천대학교 2016 김천대학교 논문집 Vol.21 No.-
In the recently our 210, it is a necessary to provide the education methods based on the electronic information systems. In this paper, we will show a education model of the venture study programs concern with Micro-Robot making. The development edu-cation systems apply into the industrial fields from the specification major module instruction including improve the system design capa-bility using the Micro-Robot making for information communication techniques Also, the development instruction model provides one in the field system to the industrial applications specification technical staffs and system design for the venture education programs. We expect the proposed education systems extended into a new venture instruction program sets for technical major members.
Synthesis and Optoelectronic Characteristics of Single-crystalline Si Nanowires
Kim, Kyung-Hwan,Keem, Ki-Hyun,Kang, Jeong-Min,Yoon, Chang-Joon,Jeong, Dong-Young,Min, Byung-Don,Cho, Kyoung-Ah,Kim, Hyun-Suk,Kim, Sang-Sig The Korean Institute of Electrical and Electronic 2005 Transactions on Electrical and Electronic Material Vol.6 No.5
Photocurrent of a single-crystalline Si nanowire is investigated in this paper. Single-crystalline Si nanowires with amorphous $SiO_2$ shells were first synthesized from ball-milled SiO powders by thermal chemical vapor deposition, and then the amorphous $SiO_2$ shells were etched out from the as-synthesized Si nanowires. For a single-crystalline Si nanowire, photocurrent-voltage curves taken in air at room temperature were non-linear, and rapid photoresponses were observed when the light was switched on and off. The photocurrent was not changed in intensity under the illumination. Photocurrent mechanism in the single-crystalline Si nanowire is discussed in this paper.
Kang-Sig Kim,Hum-Dai Park 한국동물생명공학회(구 한국동물번식학회) 2019 Journal of Animal Reproduction and Biotechnology Vol.34 No.2
Omega-3 α-linolenic acid and omega-6 linoleic acid are essential fatty acids for health maintenance of human and animals because they are not synthesized in vivo. The purpose of this study was to evaluate the effect of α-linolenic acid and linoleic acid supplementation on in vitro maturation and developmental potential of porcine oocytes. Various concentrations of α-linolenic acid and linoleic acid were added into in vitro maturation medium, and we evaluated the degree of cumulus expansion, oocyte nuclear-maturation rate, blastocyst rate, blastocyst quality, and levels of prostaglandin E2, 17b-estradiol, and progesterone in the spent medium. High doses (100 μM) of α-linolenic acid and linoleic acid supplementation significantly inhibited cumulus expansion and oocyte nuclear maturation, and prostaglandin E2 synthesis also significantly decreased compared with other groups (p < 0.05). Supplementation of 50 μM α-linolenic acid and 10 μM linoleic acid showed higher quality blastocysts in terms of high cell numbers and low apoptosis when compared with other groups (p < 0.05), and synthesis ratio of 17b-estradiol / progesterone also significantly increased compared with control group (3.59 ± 0.22 vs. 2.97 ± 0.22, 3.4 ± 0.28 vs. 2.81 ± 0.19, respectively; p < 0.05). Our results indicated that supplementation with appropriate levels of α-linolenic acid and linoleic acid beneficially affects the change of hormone synthesis (in particular, an appropriate increase in the 17b-estradiol / progesterone synthesis ratio) for controlling oocyte maturation, leading to improved embryo quality. However, high doses of α-linolenic acid and linoleic acid treatment results in detrimental effects.
Kang, Ji-Woung,Kim, Ji-Mun,Kim, Min-Soo,Kim, Youn-Hee,Kim, Woo-Nyon,Jang, Won,Shin, Dae-Sig The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.11
This study examined the effects of liquid and solid additives on the morphological, mechanical and thermal insulating properties of rigid polyurethane foams (PUFs). The PUFs synthesized with tetramethylsilane (TEMS) as a liquid-type additive showed a smaller average cell size and lower thermal conductivity than those with the aerosil 200 and clay 30B as solid-type additives. When TEMS was added, the average cell size of the PUF became more uniform and finer due to the reduced surface tension of the polymer solution, which increased the nucleation rate and number of bubbles produced and reduced cell size. The PUFs with TEMS showed the highest closed cell contents among the PUFs prepared using TEMS, aerosil 200 and clay 30B. This suggests that the insulation properties of PUF can be determined by both the size of the cell structure and the amount of closed cell contents in the system. The compression and flexural strengths of the PUF increased slightly when the aerosil 200, clay 30B and TEMS were added compared those of the neat PUF. The reaction profiles of the PUFs showed a similar gel and tack tree time with the reaction time among the PUFs synthesized with three different additives and neat PUF. This suggests that the nucleating additives used in this study do not affect the bubble growth of the chemical reaction, and the additives may act as nucleating agents during the formation of PUF. From the above results of the cell size, thermal conductivity, closed cell contents and reaction profile of the PUFs, liquid-type nucleating agent, such as TEMS, is more effective in decreasing the thermal conductivity of the PUF than solid-type nucleating agent, such as aerosil 200 and clay 30B.
김동건,김정진,김성,최창식,이봉화,김이수,강형길,한경호 대한외상학회 1998 大韓外傷學會誌 Vol.11 No.1
Background: Butane inhalation is well documented as a drug abuse in teenagers. Burn injuries might have been followed by lighting a fire in closed spaces during inhaling the fumes. Purpose: The object of this study was to assess the clinical impact of burned patients associated with Butane inhalation. Method: Sixty six burned patients associated with Butane inhalation admitted to Department of Surgery and Burn Center, Hangang Sacred Heart Hospital, College of Medicine, Hallym University from 1990 to 1997 were included in this retrospective study. Result: The most common age is 16 years old(14 cases: 21.2%), and most of patients(60 cases: 90.9%) were between 16 and 19 years old. It was shown to be occurred most frequently in Spring(28 cases: 42.4%) of the year and in midnight to 6:00 A.M. for the day(26 cases: 39.4%). The mean bum extent was 33.6%. The degree of burn commonly injured was between deep second degree and third degree(36 cases: 54.5%). The burned injury site frequently accompanied were face and hands(64 cases: 97.0%) followed by forearm(50 cases: 75.8%) in order of frequency. Twenty nine patients(43.9%) had inhalation injuries. Nine patients were dead, and the overall mortality rate was 13.6% and the most common cause of death was sepsis(5 cases: 55.6%). Split thickness skin graft was done in 23 cases(34.8%) and early excision with skin graft in 3 cases(0.5%). The most common complication was wound infection(37 cases: 56.0%), followed by hypertrophic scars(20 cases: 30.3%). Fifteen patients(22.7%) were readmitted for the department of plastic surgery. Conclusion: Most of Butane inhalation related bums occurred in teenagers in this study. We need social education programs to prevent Butane inhalation. It should be recommended to manage aggressively for the inhalation injury and burn wound.
A Model for Computer-Aided Process Planning System in Flexible Manufacturing Systems
Kang, Young-Sig,Hahm, Hyo-Joon,Rim, Suk-Chul,Kim, Seung-Baum The Korean Society for Quality Management 1994 품질경영학회지 Vol.22 No.1
Most of computer-aided process planning(CAPP) systems have been developed to automate the process planning function. In this paper, we describe an analytical model for a CAPP system in order to improve the performance of production system in flexible manufacturing systems(FMSs) for computer intergrated manufacturing(CIM) architecture. This paper proposes an optimal process planning that minimizes the load time by minimizing the cycle time and the number of workstations using Kang and Hahm's heuristic approach so as to improve the performance of production system under the batch production of discrete products. We also perform simulation using SIMAN language to campare the line utilization of each for various product types. The proposed algorithm can be implemented in existing FMSs for on-line control of product quantity using programmable logic controllers(PLC) and communication devices.