Orthorhombic-NiSi/Si (010) 구조의 Pd 치환 연구: 제 1 원리 계산

김대희,김대현,서화일,김영철,Kim, Dae-Hee,Kim, Dae-Hyun,Seo, Hwa-Il,Kim, Yeong-Cheol 한국반도체디스플레이기술학회 2008 반도체디스플레이기술학회지 Vol.7 No.4

NiSi is less stable than the previously-used $CoSi_2$ at high temperature. Some noble metals, such as Pd and Pt, have been added to NiSi to improve its thermal stability. We employed a first principles calculation to understand the Pd segregation at the interface. An orthorhombic structure of NiSi was used to construct an orthorhombic-NiSi/Si (010). Lattice parameters along a- and c-axes in orthorhombic-NiSi were matched with those of Si for epitaxy contact. The optimized $1\times4\times1$ orthorhombic-NiSi (010) and $1\times2\times1$ Si (010) superstructures were put together to construct the orthorhombic-NiSi/Si (010), and the superstructure was relieved in calculation to minimize its total free energy. The optimized interface thickness of the superstructure was $1.59\AA$. Pd atom was substituted in Ni and Si sites located near interface. Both Ni and Si sites located at the interface were favorable for Pd substitution.

밀도범함수를 이용한 정방정계-NiSi (010)/Si 계면 층의 구조 연구

김대희,김대현,서화일,김영철,Kim, Dae-Hee,Kim, Dae-Hyun,Seo, Hwa-Il,Kim, Yeong-Cheol 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.5

Tetragonal-NiSi (010)/Si superstructures were calculated for studying the interface structure using density functional theory, The orthorhombic-NiSi was changed to the tetragonal-NiSi to be matched with the Si surface for epitaxy interface. The eight interface models were produced by the type of the Si surfaces, The tetragonal-NiSi (010)/Si (020)[00-1] superstructure was energetically the most favorable, and the interface thickness of this superstructure was the shortest among the tetragonal-NiSi (010)/Si superstructures. However, in the case of tetragonal-NiSi (010)/Si (010)[00-1] superstructure, it was energetically the most unfavorable, and the interface thickness was the longest. The energies and interface thicknesses of tetragonal-NiSi (010)/Si superstructures were influenced by the coordination number of Ni atoms and the bond length between atoms located at the interface.

화상 환자에서 신속 순차 시각 제시를 이용한 주의깜빡임에 관한 예비연구

김대희,전보라,서정훈,조용석,임해준,허준,김도헌,전욱,김종현,정명훈,최인근,이병철,Kim, Dae Hee,Jun, Bora,Seo, Cheong Hoon,Cho, Yongsuk,Yim, Haejun,Hur, Jun,Kim, Dohern,Chun, Wook,Kim, Jonghyun,Jung, Myung Hun,Choi, Ihngeun,Lee, Boung Ch 대한생물정신의학회 2010 생물정신의학 Vol.17 No.2

Objectives : Trauma patients have attentional bias which enforces traumatic memories and causes cognitive errors. Understanding of such selective attention may explain many aspects of the posttraumatic stress disorder(PTSD) symptoms. Methods : We used the rapid serial visual presentation(RSVP) method to verify attentional blink in burn patients with PTSD. International affective picture system(IAPS) was used as stimuli and distracters. In the 'neutral test', patients have been presented series of pictures with human face picture as target stimuli. Each picture had 100ms interval. However the distance between target facial pictures was randomized and recognition of second facial picture accuracy was measured. In the 'stress test', the first target was stress picture which arouses patient emotions instead of the facial picture. Neutral and Stress tests were done with seven PTSD patients and 20 controls. In '85ms test' the interval was reduced to 85ms. The accuracy of recognition of second target facial picture was rated in all three tests. Eighty-five ms study was done with eighteen PTSD patients. Results : Attentional blinks were observed in 100-400ms of RSVP. PTSD patients showed increased recognition rate in the 'stress test' compared with the 'neutral test'. When presentation interval was decreased to 85 ms, PTSD patient showed decrease of attentional blink effect when target facial picture interval was 170ms. Conclusion : We found attentional blink effect could be affected by stress stimulus in burn patients. And attentional blink may be affected by stimulus interval and the character of stimulus. There may be some other specific mechanism related with selective attention in attentional blink especially with facial picture processing.

Y-doped BaZrO₃에서의 산소 공공과 프로톤의 이동

김대희,정용찬,박종성,김병국,김영철,Kim, Dae-Hee,Jeong, Yong-Chan,Park, Jong-Sung,Kim, Byung-Kook,Kim, Yeong-Cheol 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.6

We studied the transfer of oxygen vacancy and proton in Y-doped BaZr$O_3$ (BYZ) using density functional theory (DFT). An oxygen vacancy was generated in the $2{\times}2{\times}2$ BYZ superstructure by replacing two Zr atoms with two Y atoms to satisfy the charge neutrality condition. The O vacancy transfer between the first and second nearest O atom sites from a Y atom showed the lowest activation energy barrier of 0.42 eV, compared to the other transfers between first and first, and second and second in the superstructure. Two protons were inserted in the structure by adding a proton and hydroxyl that were supplied by the dissociation of a water molecule. The two protons bonded to the first and second nearest O atoms were energetically the most favorable. The activation energy barrier for a proton transfer in the structure was 0.51 eV, when either proton transferred to its neighbor O atom. This value was well matched with the experimentally determined one.

방추리(경기도, 이천시)의 거미상

김주필(Joo Pil Kim),김대희(Dae Hee Kim) 한국거미연구소 2017 한국거미 Vol.33 No.2

2013년 10월 20일부터 2017년 8월 6일까지 경기도 이천시 장호원읍 방추리 일대를 한국거미연구회 회원 김대희가 채집한 결과, 총 20과 44속 57종이 조사 연구되어 이에 발표하는 바이다. 채집한 표본은 주필거미박물관에 보관하였다. From October 20 2013 to August 6 2017, Kim Dae-hee, the member of The Arachnological Institute of Korea, collected the spiders in the whole area of Bangchu-ri, and reports 20 families, 44 genera 57 species of spiders. The collected spiders are placed in the Joo-Pil Spider museum in Namyangju-si, Gyeonggi-do.

재오개리(충청북도, 충주시)의 거미상

김주필(Joo Pil Kim),김대희(Dae Hee Kim) 한국거미연구소 2017 한국거미 Vol.33 No.2

2014년 5월 4일부터 2017년 8월 5일까지 충청북도 충주시 살미면 재오개리 일대를 한국거미연구회 회원 김대희가 주야로 채집한 결과, 총 18과 43속 47종이 조사 연구되어 이에 발표하는 바이다. 채집한 표본은 주필거미박물관에 보관되어있다. From May 4 2014 to August 5 2017, collected spiders of 18 families 43 Genera 47 species from Jaeogae-ri, Salml-myeon, Chungju-si, Chungcheongbuk-do. The result of investigation is reported by Dae-Hee Kim, the member of Arachnological Institute of Korea. The specimens of those spiders are placed in the Joo-Pil Spider Museum.

안전관련 규제 개선방안

김대희,Kim, Dae-Hui 대한석유협회 1998 석유와 에너지 Vol.1998 No.9

전자상거래 활성화를 위한 법제도 정비 및 인프라 확충

김대희,Kim, Dae-Hui 대한석유협회 2000 석유와 에너지 Vol.2000 No.3

결막하 5-Fluorouracil 주입술 후 전방 내 유입에 의한 각막 내피세포 손상 1예

김대희,김민호,안재홍,Dae Hee Kim,Min Ho Kim,Jae Hong Ahn 대한안과학회 2010 대한안과학회지 Vol.51 No.9

Purpose: To present a case of corneal endothelial damage caused by inflow of 5-FU after subconjunctival 5-FU injection in a patient undergoing trabeculectomy. Case Summary: A 65-year-old female patient diagnosed with chronic angle-closure glaucoma underwent trabeculectomy using mitomycin C. Three weeks after the surgery, her intraocular pressure (IOP) elevated, and the follicles had disappeared by trabeculectomy. Subsequently, subconjunctival 5-FU injection was performed. Following the fourth injection, visual acuity abruptly decreased, and corneal edema was observed. Upon presumption of inflow of 5-FU into the anterior chamber, anterior chamber irrigation was performed within 40 minutes. On postoperative day 1, visual acuity decreased from 0.8 to counting fingers, and diffuse corneal edema and anterior capsular opacity of the lens were noted. Three months after the irrigation, visual acuity improved to 0.8. Corneal edema and capsular opacity also improved, however the density of the corneal endothelial count decreased. Conclusions: Inflow of 5-FU into the anterior chamber can cause corneal and lenticular toxicity. Anterior chamber irrigation is considered necessary to prevent 5-FU toxicity. J Korean Ophthalmol Soc 2010;51(9):1287-1291

거대 흉벽 결손에 대한 확장 외복사근 근피판을 이용한 흉벽재건 치험례

김대희,김정헌,송승용,Kim, Dae-Hee,Kim, Chung-Hun,Song, Seung-Yong 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.3

Purpose: The resection of locally advanced or recurred breast cancers frequently result in large chest wall defects and it leads to a great challenges to cover. Generally simple skin grafts are not a practical option for patients because of their poor cosmetic appearance and prognosis. The latissimus dorsi and rectus abdominis musculocutaneous flap have traditionally been recommended for closure of these large defects. Though the cosmetic result of reconstruction using these flaps is often excellent, but has significant drawbacks. Therefore, we thought that chest wall reconstruction using the external oblique musculocutaneous flap can be an alternative method for extensive chest wall defect related to large, locally advanced breast carcinoma. Methods & Results: We present a case of a 50-year-old Korean female, refered to our department with a left breast tumor for 10 months. CT demonstrate a large tumor on the left anterior chest wall and multiple nodules of varying size in the cervical areas and liver. FDG-PET showed areas of hot uptake throughout the left chest wall, mediastinum and liver. Biopsy was consistent with invasive ductal carcinoma (Grade III). The initial tumor was considered inoperable, so a series of chemotherapy was initiated. Though the size of the breast mass was slightly decreased, the patient continued to suffer from purulent discharge, unpleasant odor and contact bleeding of the mass, the salvage mastectomy was performed. Conclusion: We could reconstruct $23{\times}16\;cm$ sized large chest wall defect, resulting from the resection of a locally advanced breast carcinoma, using an external oblique musculocutaneous flap successfully. Immediate postoperatively checked flap was healthy. Overall result was good without any significant complications and discharged 3 weeks after operation.