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Bosch 공정에서 Si 식각속도와 식각프로파일에 대한 Ar 첨가의 영향
지정민 ( Jung Min Ji ),조성운 ( Sung Woon Cho ),김창구 ( Chang Koo Kim ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.6
Bosch 공정의 식각 단계에서 Ar을 첨가하였을 때 Si의 식각특성을 관찰하기 위하여 식각 단계에서 SF6 플라즈마만 사용한 경우와 Ar 유속비율이 20%인 SF6/Ar 플라즈마를 각각 사용하여 Si을 Bosch 공정으로 식각하였다. Bosch 공정의 식각 단계에서 SF6 플라즈마에 Ar 가스를 첨가하면 Ar+ 이온에 의한 이온포격이 증가하였고 이는 Si 입자의 스퍼터링을 초래할 뿐 아니라 F 라디칼과 Si의 화학반응을 가속하였다. 그 결과 식각 단계에서 20%의 Ar이 첨가되어 Bosch 공정으로 수행된 Si의 식각속도는 Ar이 첨가되지 않은 경우보다 10% 이상 빨라졌고 식각프로파일도 더욱 비등방적이었다. 이 연구의 결과는 Bosch 공정으로 Si을 식각할 때 식각속도와 식각프로파일의 비등방성을 개선하는데 필요한 기초자료로 사용될 수 있을 것으로 판단된다. The etch rate and etch profile of Si was investigated when Ar was added to an SF6 plasma in the etch step of the Bosch process. A Si substrate was etched with the Bosch process using SF6 and SF6/Ar plasmas, respectively, in the etch step to analyze the effects of Ar addition on the etch characteristics of Si. When the Ar flow rate in the SF6 plasma was increased, the etch rate of the Si substrate increased, had a maximum at 20% of the Ar flow rate, and then decreased. This was because the addition of Ar to the SF6 plasma in the etch step of the Bosch process resulted in the bombardment of Ar ions on the Si substrate. This enhanced the chemical reactions (thus etch rates) between F radicals and Si as well as led to sputtering of Si particles. Consequently, the etch rate was higher more than 10% and the etch profile was more anisotropic when the Si substrate was etched with the Bosch process using a SF6/Ar (20% of Ar flow rate) plasma during the etch step. This work revealed a feasibility to improve the etch rate and anisotropic etch profile of Si performed with the Bosch process.
2021년 경남지역 소바이러스성설사 바이러스(BVDV) 감염실태 조사
손용우,조성희,지정민,조재규,방상영,최유정,김철호,김우현,Son, Yongwoo,Cho, Seonghee,Ji, Jeong-Min,Cho, Jae-Kyu,Bang, Sang-Young,Choi, Yu-Jeong,Kim, Cheol-Ho,Kim, Woo Hyun The Korean Society of Veterinary Service 2022 韓國家畜衛生學會誌 Vol.45 No.3
Bovine viral diarrhea (BVD) is one of the problematic wasting diseases in cattle leading to huge economic losses. This study was conducted to investigate the prevalence of BVD including transient and persistent infection from cattle farms in Gyeongsangnam-do. A total of 2,667 blood samples from 24 farms were collected and the sera were subjected to ELISA to detect BVD virus (BVDV) antigen, E<sup>rns</sup>. 5' untranslated region (5'-UTR) of BVDV-positive samples was sequenced to identify the genotype, and compared with isolates previously reported elsewhere. There were fourteen BVDV-positive calves from 2,667 samples (positive rate: 0.52%) from first ELISA testing followed by eight persistently infected out of eleven BVDV-positive samples (72.73%) in secondary ELISA that was conducted in at least four weeks suggesting the circulation of BVDV in the area. Sequencing analysis exhibited that thirteen BVDV-positive samples were identified as BVDV-1b and one sample was BVDV-2a. Phylogenetic analysis revealed that the BVDV-1b-positive samples showed the highest homology in nucleotide sequence to Korean isolates collected from Sancheong, Gyeongsangnam-do, while the BVDV-2a-positive sample (21GN7) was more similar to reference strains collected outside South Korea. This study will provide the recent fundamental data on BVD prevalence in Gyeongsangnam-do to be referred in developing strategies to prevent BVDV in South Korea.
김형수,김주학,지정민,Kim, Hyoung-Soo,Kim, Joo-Hak,Ji, Jeong-Min 대한관절경학회 2005 대한관절경학회지 Vol.9 No.2
슬개건과 슬괵건은 전방 십자 인대의 관절 내 재건에 가장 빈번하게 사용되는 조직이다. 일반적으로 중앙 1/3 슬개건 이식을 전방 십자 인대 재건에 있어서 gold standard로 생각하고 있다. 그러나 Harder와 Aglietti 등의 저자들에 의한 최근의 연구들은 슬관절 안정성과 기능적인 결과에 있어서 중앙 1/3 슬개건 이식과 슬괵건 이식 사이에 통계학적으로 의미 있는 차이점을 발견하지 못했다. 이 연구의 목적은 문헌 고찰을 통하여 (1) 전방 십자 인대 재건술에 있어서 슬괵건 이식의 역사를 고찰하고 (2) 전방 십자 인대 재건술에 있어서 슬괵건 이식의 사용에 대한 적응증을 논의하고 (3) 연합 이중 고리의 반건양건과 박건 이식을 사용하여 $RIGIDFIX^{circledR}$와 $INTRAFIX^{circledR}$로 고정하는 전방 십자 인대 재건술의 술기를 묘사하고 (4) 슬괵건 전방 십자 인대 재건술의 결과를 재검토하는 것이다. The central third of the patellar tendon and hamstring tendons(semitendinosus and gracilis) are the most frequently used tissues for intra-articular replacement of the anterior cruciate ligament(ACL). At present, many surgeons consider the central third patellar ten don graft to be the gold standard for replacement of the ACL. Recent prospective studies by Marder et at and Aglietti et al, however, have failed to show any statistically significant differences in knee stability and functional outcome between central third patellar tendon grafts and hamstring tendon grafts. The review of this article is to (1) review the historical use of hamstring tendon grafts for ACL reconstruction; (2) discuss indications for use of hamstring tendon grafts for ACL reconstruction; (3) describe our present operative technique using a combined double-looped semitendinosus and gracilis graft with $RIGIDFIX^{circledR}$ and $INTRAFIX^{circledR}$ and (4) review the results of hamstring ACL reconstructions.
푸시업 운동 시 팔 간격에 따른 대흉근과 상완삼두근의 근활성도 비교 분석
남기정(Nam, Ki-Jeong),지정민(Ji, Jeong-Min),홍형(Hong, Hyung),김현수(Kim, Hyun-Soo),이종훈(Lee, Chong-Hoon) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.4
The purpose of this study was to analysis of electromyogram of Pectoralis Major and Triceps Brachii during Push-Up Exercise. With these purposes in consideration, a total of 9 male were recruited to participate. The experiment was performed push-up exercise during one minute(with 5 min break-time) while the EMG data was recorded and analyzed. EMG surface electrodes were attached two muscles(Pectoralis Majoj; PM and Triceps Brachii; TB). Results show that there were significant differences between PM and TB during push-up exercise at 120% shoulder width. It is concluded that the push-up exercise at 120% shoulder width is only effective exercise for developing PM.
최태현(TaeHyeon Choi),지정민(JeongMin Ji),박준훈(JoonHoon Park),최명진(MyungJin Choi),이상근(Sangkeun Lee) 大韓電子工學會 2011 電子工學會論文誌-SP (Signal processing) Vol.48 No.5
본 논문에서는 위성영상을 압축하는 과정에서 발생하는 압축잡음을 내용 분석을 통해 적응적으로 제거하는 디블록킹 알고리즘을 제안 한다. 특히, 제공된 KOMPSAT(korean multi-purpose satellite)-2는 열 단위로 동일한 양자화 계수를 적용하며 고주파 성분이 많은 부분을 압축하여 효율 및 시간을 향상 시켰으나 압축률이 높은 동일 열 내에 복잡도가 낮은 부분에서 압축 잡음이 나타나는 문제점이 있다. 이러한 압축잡음을 제거하기 위해 일반적인 디블록킹 필터를 적용 시 복잡한 영역을 평활화 시키는 문제점이 있다. 따라서 제안한 방법에서는 영상 분석 후 적응적 디블록킹 필터를 통해 에지를 보존하면서 격자잡음을 제거 한다. 이와 동시에 WLFPCA(weighted lowpass filter using principle component analysis)를 이용하여 큰 곡선형 경계 부분의 계단잡음을 제거 하였다. 제안한 방법은 성능을 평가하기 위한 모의실험 결과로부터 기존의 방법에 비하여 객관적 화질 지표인 PSNR(peak signal to noise ratio)과 주관적 화질 지표인 MSSIM(mean structural similarity)에서 비슷하거나 향상된 결과를 보였으며 특히, 기존의 압축잡음 제거 알고리즘은 반복적 프로세싱을 통해 계단잡음을 제거하나 제안한 방법은 싱글패스(single-path) 방식으로 시간을 크게 단축시켜 실시간에 가까운 처리가 가능하도록 하였으며, 계산양을 줄여 하드웨어의 적용이 용이하게 하였다. In this paper, we present a deblocking algorithm that removes grid and staircase noises, which are called “blocking artifacts”, occurred in the compressed satellite images. Particularly, the given satellite images are compressed with equal quantization coefficients in row according to region complexity, and more complicated regions are compressed more. However, this approach has a problem that relatively less complicated regions within the same row of complicated regions have blocking artifacts. Removing these artifacts with a general deblocking algorithm can blur complex and undesired regions as well. Additionally, the general filter lacks in preserving the curved edges. Therefore, the proposed algorithm presents an adaptive filtering scheme for removing blocking artifacts while preserving the image details including curved edges using the given quantization step size and content analysis. Particularly, WLFPCA (weighted lowpass filter using principle component analysis) is employed to reduce the artifacts around edges. Experimental results showed that the proposed method outperforms SA-DCT in terms of subjective image quality.
박재형,김형수,김현철,지정민,Park Jai-Hyung,Kim Hyoung-Soo,Kim Hyun-Chul,Ji Jeong-Min 대한정형외과스포츠의학회 2004 대한정형외과스포츠의학회지 Vol.3 No.2
Thigh injuries are relatively uncommon sports injuries. But the incidence is increasing as many kinds of sports activity develops. And the prompt recognition and treatment of these injuries are critical to prevent prolonged disability. Also, despite the simple anatomic structure of the thigh, this region is finely tuned muscular mechanism with both anterior and posterior muscles crossing two joints. So the contracture of thigh muscle can result in not only decreased range of motion of the knee and hip joint, but also painful lumbar spine. So we reviewed recent literatures about the type of thigh injuries, diagnosis, treatment and rehabilitation.
적응적 중간값 필터와 형태학적 기법을 이용한 국부적인 임펄스 잡음 제거
송영훈(Younghun Song),한윤상(Yunsang Han),지정민(JeongMin Ji),박준훈(Joonhoon Park),이상근(Sangkeun Lee) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6
We propose a local impulsive noise removal method occurred during image fusion processes. First, we perform median filtering and subtraction between the original and median filtered images. Next, the noisy regions are estimated through morphological operation in the subtracted image. Finally, adaptive median filtering is performed in the estimated noise regions. In order to evaluate the performance of the proposed algorithm, the quantitative measure is defined in terms of the peak signal-to-noise ratio(PSNR). The experimental results showed that the proposed method can significantly remove local impulse noise.