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리튬이차전지용 정극활물질 LiNi1-xCoxO2 의 제조 공정에 따른 전기화학적 특성
고영욱,김현중,이철태,김홍철,엄의흠 한국공업화학회 2000 응용화학 Vol.4 No.2
To improve the electrochemical characteristics of positive electrode in lithium secondary battery, synthesized LiNi_(1-x)Co_xO₂ by sol-gel method and emulsion-drying method. The optimal synthesis conditions and the electrochemical characteristics of LiNi_(1-x)Co_xO₂ with variation of x were studied. Synthesized by sol-gel and emulsion-drying method at the optimal conditions, the hexagonal lattice parameter c increased with increasement of x. Therefore, Ni rich samples showed good cycle-life characteristics and high coulomb efficiency than Co rich samples and Co rich samples showed higher initial discharge capacity than Ni rich sample.
고영욱,강남대 진주산업대학교 환경문제연구소 1998 環境硏究論文集 Vol.2 No.-
The safflower was cultivated before rice transplanting in Young Nam area in 1998. Seeding time of safflower was February 27, March 18, and Apirl 7, and randomized block design with three replications. Rice was transplantated from July 1 to July 13 after safflower was harvested. The results obtained were summarized as follows. 1. The harvest time of safflower seeds was shorten 12 days in sowing of Faburly 27 compared to the sowing of April 7. 2. The production of safflower seeds in sowing of Faburly 27 was increased to 156% compared to April 7. 3. The seed production of safflower in56+ sowing of April 7 was reduced because of deficiency early leafs area. 4. Proudctions of rice in transplanting July 1 after haverst safflower seeds increased 15% compared to July 13.
언더필이 적용된 $\mu$p BGA 솔더 접합부의 열피로특성
고영욱,김종민,이준환,신영의 대한용접접합학회 2003 대한용접·접합학회지 Vol.21 No.4
There have been many researches for small scale packages such as CSP, BGA, and Flipchip. Underfill encapsulant technology is one of the latest assembly technologies. The underfill encapsulant could enhance the reliability of the packages by flowing into the gap between die and substrate. In this paper, the effects of underfill packages by both aspects of thermal and mechanical reliabilities are studied. Especially, it is focused to value board-level reliability whether by the underfill is applied or not. First of all, The predicted thermal fatigue lifes of underfilled and no underfilled $\mu$ BGA solder joints are performed by Coffin-Manson's equation and FEA program, ANSYS(version 5.62). Also, the thermal fatigue lifes of $\mu$ BGA solder joints are experimented by thermal cycle test during the temperature, 218K to 423k. Consequently, both experimental and numerical study show that $\mu$ BGA with underfill has over ten times better fatigue lift than $\mu$ BGA without underfill.
내진성능평가시 횡보강근이 없는 RC 보-기둥 접합부의 전단내력 평가
고영욱 한국지진공학회 2019 한국지진공학회논문집 Vol.23 No.5
To study the seismic resistance of the shear capacity of the RC beam-column joints of two-story and four-story RC buildings, sample buildings are designed with ordinary moment resisting frame. For the shear capacity of joints, the equations of FEMA 356 and NZ seismic assessment are selected and compared. For comparison, one group of buildings is designed only for gravity loads and the other group is designed for seismic and gravity loads. For 16 cases of the designed buildings, seismic performance point is evaluated through push-over analysis and the capacity of joint shear strength is checked. Not only for the gravity designed buildings but also for seismic designed buildings, the demand of joint shear is exceeding the capacity at exterior joints. However, for interior joint, the demand of joint shear exceeds the capacity only for one case. At exterior joints, the axial load stress ratio is lower than 0.21 for gravity designed buildings and 0.13 for seismic designed buildings.
위상변이법과 디지탈 영상처리를 이용한 홀로그래피 간섭무늬의 정량적 해석
고영욱,권영하,강대임,박승옥 대한기계학회 1992 대한기계학회논문집 Vol.16 No.9
Holographic interferometry technique has been used for the measurement of whole-field deformation with high sensitivity. However there are some difficulties in quantitatively analyzing the holographic fringes. Recently, quantitative and automatic fringe analysis by using phase shifting method in interferometry has been studied in many fields. In this paper, a real time holographic interferometry system and a phase shifting method combined with digital image processing technique are employed to record and quantitatively analyze holographic fringe patterns. To evaluate our system and analyze errors, comparison of measured deformation with theoretical deformation of cantilever beam was carried out. The accuracy of 4.5% in our system was verified We have tried to apply this method to quantitatively measure the deformation of turbine blade under the bending force. 본 연구에서는 실시간 홀로그래피 간섭계(real time holographic interfero- metry ststem)를 구성하고 위상변이법과 디지탈 영상처리를 이용하여 물체 변형을 실 시간으로 자동 측정이 가능하도록 하였다. 한편 광학계 구성과 대상물체의 상태에 따른 오차 요인을 해석하기 위해서 외팔보를 대상물체로 하여 측정된 변형값과 이론값 을 비교하였다. 응용예로써는 터빈 블레이드(turbine blade)에 굽힘력이 가해질때 나타나는 미소변형을 측정하였다.
고영욱,김형균,김환용,Ko, Young-Oog,Kim, Hyeoung-Kyun,Kim, Hwan-Yong 대한전자공학회 1999 電子工學會論文誌, C Vol.c36 No.2
본 논문에서는 HDTV 비디오 신호를 처리함에 있어 신호의 병목현상을 없애주고 신호의 원활한 처리를 위해 새로운 알고리듬을 적용하여 54MHz의 동작 주파수를 갖는 패커를 제안하였다. 또한 제안된 패커의 성능을 검증하기 위해 조합논리를 이용한 ROM 테이블 구조를 갖는 DCT 계수 부호화부를 함께 설계하므로써 DCT 계수 부호화부의 출력을 제안된 패커의 입력 데이타로 사용하였다. 본 논문에서 제안된 회로는 VHDL 코드를 이용하여 설계하였고 SYNOPSYS tool의 $0.65{\mu}m$ 공정을 이용한 모델링과 시뮬레이션을 수행하였다. In this paper, a packer is proposed for removing the bottle-neck effect and processing easy signal using a new algorithm with the operation frequency of 54MHz in processing HDTV video signal. To verify the performance of the proposed packer, DCT coefficient encoding block with ROM table using a combinational logic is designed and its output data are used as the input data of the packer.The proposed circuits, in this paper, are designed by using VHDL code and its modeling and simulation are performed with SYNOPSYS tool in $0.65{\mu}m$ design rule.
한국연안 해조류 생물량의 연간 변동 양상: 제주도 문섬지역
고영욱,성건희,이창호,김현희,최동문,고용덕,이욱재,고형범,옥정현,정익교,김정하,Ko, Young-Wook,Sung, Gun-Hee,Yi, Chang-Ho,Kim, Hyun-Hee,Choi, Dong-Mun,Ko, Yong-Deok,Lee, Wook-Jae,Koh, Hyoung-Bum,Oak, Jung-Hyun,Chung, Ik-Kyo,Kim, Jeong-H 한국조류학회(藻類) 2008 ALGAE Vol.23 No.4
Seaweed biomass was estimated using a nondestructive method in the rocky subtidal zones in Munseom, Jeju Island, Korea from July 2006 to April 2008. Seasonal samplings were done at the depth of 1, 5, 10 m using 50 x 50 cm quadrat. Mean biomass was comprised of 2,784 g wet wt m$^{-2}$ and the biomass values varied seasonally from 1,176 g wet wt m$^{-2}$ to 4,217 g wet wt m$^{-2}$ with the highest point in April. Biomass reached maximum at 5 m depth in spring, but was shifted to 10 m depth in summer. Common seaweeds appeared year round in Munseom were Codium minus, Ecklonia cava, Sargassum spp., articulated corallines and Plocamium telfairiae. Among them, E. cava showed the highest biomass (average of 1,288 g wet wt m$^{-2}$), comprising 4% of total biomass. Only 12 species’' biomass covered 98% of total value, which indicated the contribution of few common species to algal community. Seaweed biomass in Munseom represented one of the highest values in coastal regions in Korea.