단색 분광기 회절격자의 정밀 구동 기구에 관한 연구

김대석(Dae-Suk Kim),최기봉(Kee-Bong Choi),김수현(Soo-Hyun Kim),곽윤근(Yoon Keun Kwak) Korean Society for Precision Engineering 1997 한국정밀공학회지 Vol.14 No.11

안전한 결제 환경을 위한 NFC 기반 모바일 결제 시스템

김대석 ( Dae-suk Kim ),박성욱 ( Sung-wook Park ),이임영 ( Im-yeong Lee ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.2

NFC 기능을 탑재한 스마트폰의 보급이 증가하고 점차적으로 NFC를 활성화하여 고객에게 편리함을 주려는 기업들이 늘어나고 있다. 하지만 기존의 NFC 기반 Payment System의 경우 사용자의 개인정보를 부분적으로 암호화하지 않은 것과 내부 및 제 3자의 개인정보 유출, 그리고 개인정보를 무단활용을 대표적인 문제점으로 나타낼 수 있다. 뿐만 아니라 도난 및 분실의 위험으로 인한 피해가 있을 수 있다. 이러한 문제점들로 인하여 본 연구에서는 자체적인 NFC 보안에 사용자 어플리케이션 실행 시 한 번의 개인정보 입력에 따른 암호화로써 NFC 단말기 간의 정보를 주고 받을 때 암호화를 할 수 있도록 구현하고자 한다. 이렇게 함으로써 NFC를 이용하여 결제를 하였을 시에 암호화 된 개인정보이기 때문에 외부의 공격자로부터 보안에 대한 위협을 줄일 수 있으며, 도난과 분실에도 개인정보가 식별되지 않기 때문에 보다 안정성을 높일 수 있다.

Methotrexate에 의해 유발된 방사선 회상 피부염

김대석 ( Dae Suk Kim ),이희정 ( Hee Jung Lee ),최윤진 ( Yoon Jin Choi ),정혜진 ( Hye Jin Chung ),정기양 ( Kee Yang Chung ) 대한피부과학회 2007 大韓皮膚科學會誌 Vol.45 No.7

Radiation recall dermatitis is the development of an inflammatory reaction in the previously irradiated area, precipitated by the administration of certain drugs. A 54-year-old man was diagnosed with follicular lymphoma, grade 3 and stage 3. Cancer recurred two years after complete remission obtained by chemotherapy and radiotherapy. Therefore, he was again treated with fludarabine and mitoxantrone for five cycles, then underwent an allogeneic peripheral blood stem cell transplantation (PBSCT). The patient started to receive methotrexate the day after PBSCT. On the day of the first methotrexate administration, the patient developed erythematous erosions with pruritus and severe pain in the previously irradiated area. The skin lesion resolved almost completely after dressing with topical antibiotics and wet dressing with 0.3% aluminium solution for 2 weeks. We report a case of radiation recall dermatitis in a patient with follicular lymphoma that occurred after receiving methotrexate. (Korean J Dermatol 2007;45(7):742∼744)

구강편평태선 35예의 임상적 고찰

김대석 ( Dae Suk Kim ),방동식 ( Dong Sik Bang ) 대한피부과학회 2007 대한피부과학회지 Vol.45 No.1

Background: Oral lichen planus (OLP) is a relatively common chronic inflammatory oral mucosal disease of unknown cause. Oral lesions in OLP are chronic, rarely undergo spontaneous remission, are potentially premalignant and are often a source of morbidity. Objective: The purpose of our investigation was to describe the clinical characteristics of 35 patients with biopsy-proven OLP. Methods: We reviewed the medical records and clinical photographs of 35 patients who had been diagnosed with OLP during the last 5 years, from January 2001 to March 2006. We identified average age of onset, gender distribution, presence of family history, clinical types, location of the oral lesion, symptoms, associated dermatologic and systemic disease and treatment modalities. Results: Of the 35 patients, 65.7% were women and 34.3% men. The average age of onset for men was 41.2 years and for women was 52.4 years (overall average age of onset was 48.5 years). Only 5 patients had a family history of OLP, which had not been proven by histologic examination. Of the 35 OLP patients, the reticular type was found in 45.7%, the erythematous type in 31.4% and erosive type in 22.9% of patients. The most common site of oral lesions was the buccal mucosa, which was found in 57.1 % of the patients. The lips were the second most commonly involved site at 48.6%, then the tongue at 8.6% and gingiva at 5.7%. Except for the 4 asymptomatic patients, the rest of the patients complained of various symptoms such as a pain, a burning sensation, pruritus and irritation. Many cutaneous and systemic diseases were associated with OLP patients. 3 patients had concomitant cutaneous lichen planus. Only 1 patient was found to be infected with hepatitis C virus. Various treatments had been tried by all patients. Oral squamous cell carcinoma developed in 1 patient at sites previously diagnosed by biopsy as OLP. Conclusion: This is the first clinical study of OLP patients in the Korean dermatologic literature. The clinical features of patients in this survey share many similarities with those reported previously, but showed some differences too. The clinical findings of OLP should be evaluated in much larger groups of patients and more experimental investigations should be conducted to find out exact pathogenesis and effective treatments for OLP. (Korean J Dermatol 2007;45(1):1~8)

발바닥에 발생한 피부섬유종 1예

김대석 ( Dae Suk Kim ),최윤진 ( Yoon Jin Choi ),노미령 ( Mi Ryung Roh ),이민걸 ( Min Geol Lee ) 大韓皮膚科學會 2007 大韓皮膚科學會誌 Vol.45 No.12

다양한 Haptens 및 자극물질에 의한 마우스 골수 수지상세포의 활성산소종의 생성과 역할

김대석 ( Dae Suk Kim ),김동현 ( Dong Hyun Kim ),이태형 ( Tae Hyung Lee ),조영훈 ( Young Hun Cho ),이민걸 ( Min Geol Lee ),( Dashlkhumbe Byamba ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.11

Background: Various allergens and irritants induced the production of reactive oxygen species (ROS) in the well-established mouse dendritic cell (DC) line XS106 and this production of ROS was inhibited by antioxidants. Objective: To investigate the production and functions of ROS in mouse bone marrow-derived DCs (BM-DCs) by various haptens and irritants, we examined the production of ROS, the expression of surface molecules, and the production of interleukin-12 (IL-12) in mouse BM-DCs. Methods: Six to eight-week-old female C57/BL6 mice were used in this study. Mouse BM-DCs were co-cultured with DNFB, DNCB, TNBS, hydroquinone, NiSO4, CoCl2, MnCl2, thimerosal, SDS, and BKC. The production of ROS and the expression of surface molecules (CD40, CD80, CD86, and MHC-II) were measured by flow cytometry in chemical-treated mouse BM-DCs. In addition, the cells were pretreated with antioxidants to determine whether the production of ROS can be inhibited. The production of IL-12 was also measured in DNCB and SDS-treated mouse BM-DCs using ELISA. Results: The production of ROS in mouse BM-DCs was induced by various allergens, including DNFB, DNCB, TNBS, hydroquinone, MnCl2 and irritants like SDS, BKC. The expression of surface molecules was induced by various chemicals and NiSO4 was the most potent inducer of surface molecules in mouse BM-DCs. The production of ROS in DNCB and SDS-treated mouse BM-DCs was partially inhibited by diphenylene iodonium, but not by rotenone, vitamin E, allopurinol, glutathione. The production of IL-12 was not detected in DNCB and SDS-treated mouse BM-DCs. Conclusion: The production of ROS was induced in mouse BM-DCs by various allergens and irritants. The expression of surface molecules was also induced by various chemicals. The production of ROS was partially inhibited by DPI. The production of IL-12 was not detected. (Korean J Dermatol 2008; 46 (11): 1470∼1477)

담지체로서 TiO2의 형태제어에 따른 백금 계열 전극촉매의 ORR 활성 변화

김대석(Dae-Suk Kim),김용태(Yong-Tae Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5

Platinum based Proton exchange membrane fuel cell (PEMFC) commonly used carbon as the support. However, carbon corrosion is the major problem to obtain sufficient durability. Several papers which oxide support used were reported to solve that problem. In this study, shape controlled TiO2 as supports for Pt-based electrocatalysts have been synthesized for PEMFC catalyst. Shape controlled TiO2 was obtained by adding additives in a hydrothermal synthesis. It was exhibited that Hydrofluoric acid (HF) additive treated TiO2 was changed into the round shape was decreased by using Transmission electron microscopy (TEM). The prepared electrocatalysts were characterized by X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS), and oxygen reduction reaction (ORR). HF treated Ti02 as support for Pt electrocatalyst was showed that ORR activity was highly enhanced than non-treated TiO2. The HF treated TiO2 appear to be promising supporting materials that stabilize catalyst particles in PEMFC.

파종성 표피융해성 극세포종 1예

김대석 ( Dae Suk Kim ),구본철 ( Bon Cheol Goo ),한은천 ( Eun Chun Han ),김동현 ( Dong Hyun Kim ),이민걸 ( Min Geol Lee ) 대한피부과학회 2007 大韓皮膚科學會誌 Vol.45 No.2

베네주엘라 초중질유 저류층 지질 특성

김대석,권이균,장찬동,Kim, Dae-Suk,Kwon, Yi-Kyun,Chang, Chan-Dong 대한자원환경지질학회 2011 자원환경지질 Vol.44 No.1

Extra heavy oil reservoirs are distributed over the world but most of them is deposited in the northern part of the Orinoco River in Venezuela, in the area of 5,500 $km^2$, This region, which has been commonly called "the Orinoco Oil Belt", contains estimated 1.3 trillion barrels of original oil-in-place and 250 billion barrels of established reserves. The Venezuela extra heavy oil has an API gravity of less than 10 degree and in situ viscosity of 5,000 cP at reservoir condition. Although the presence of extra heavy oil in the Orinoco Oil Belt has been initially reported in the 1930's, the commercial development using in situ cold production started in the 1990's. The Orinoco heavy oil deposits are clustered into 4 development areas, Boyaco, Junin, Ayachoco, and Carabobo respectively, and they are subdivided into totally 31 production blocks. Nowadays, PDVSA (Petr$\'{o}$leos de Venzuela, S.A.) makes a development of each production block with the international oil companies from more than 20 countries forming a international joint-venture company. The Eastern Venezuela Basin, the Orinoco Oil Belt is included in, is one of the major oil-bearing sedimentary basins in Venezuela and is first formed as a passive margin basin by the Jurassic tectonic plate motion. The major source rock of heavy oil is the late Cretaceous calcareous shale in the central Eastern Venezuela Basin. Hydrocarbon materials migrated an average of 150 km up dip to the southern margin of the basin. During the migration, lighter fractions in the hydrocarbon were removed by biodegradation and the oil changed into heavy and/or extra heavy oil. Miocene Oficina Formation, the main extra heavy oil reservoir, is the unconsolidated sand and shale alternation formed in fluvial-estuarine environment and also has irregularly a large number of the Cenozoic faults induced by basin subsidence and tectonics. Because Oficina Formation has not only complex lithology distribution but also irregular geology structure, geological evolution and characteristics of the reservoirs have to be determined for economical production well design and effective oil recovery. This study introduces geological formation and evolution of the Venezuela extra heavy oil reservoirs and suggest their significant geological characteristics which are (1) thickness and geometry of reservoir pay sands, (2) continuity and thickness of mud beds, (3) geometry of faults, (4) depth and geothermal character of reservoir, (5) in-situ stress field of reservoir, and (6) chemical composition of extra heavy oil. Newly developed exploration techniques, such as 3-D seismic survey and LWD (logging while drilling), can be expected as powerful methods to recognize the geological reservoir characteristics in the Orinoco Oil Belt. 베네주엘라 중앙에 위치한 오리노코강을 따라 55,000 $km^2$의 면적에 동서로 길게 자리하는 오리노코 오일벨트에는 원시부존량이 약 1조 3천억 배럴, 가채매장량이 2,500억 배럴에 달하는 초중질유가 매장되어 있다. 베네주엘라 초중질유는 API 비중이 $10^{\circ}$ 이하이고, 점성도가 5,000 cP 정도로 무겁고 점성이 큰 탄화수소 자원이다. 오리노코 지역의 초중질유는 1930년대 최초로 보고되었지만, 이들의 상업적 개발은 1990년대에 이르러 비가열식 일차생산기법을 통해서 본격적으로 이루어지기 시작하였다. 오리노코 오일벨트는 초중질유 분포 양상에 의해 보야카, 주닌, 아야쿠초, 카라보보의 생산광구로 나누어지며, 이들은 모두 31개의 생산블럭으로 소분류된다. 현재 각 생산블럭은 베네주엘라 PDVSA와 외국계 기업의 합작 형태로 개발되고 있으며, 20개국 이상이 초중질유 개발 프로젝트에 참여하고 있다. 오리노코 오일벨트는 베네주엘라의 주요 석유분지 가운데 하나인 동베네주엘라 분지의 남쪽지역에 위치한다. 동베네주엘라 분지는 쥬라기 판 분화에 의해 형성되기 시작한 수동형 대륙 주변부 분지로 그 면적은 약 120,000 $km^2$이다. 동베네주엘라 분지에서 백악기 말에 형성된 석회질 셰일은 초중질유의 주요 근원암이다. 분지 내 탄화수소는 북쪽에서 남쪽으로 평균 150 km를 이동하면서 생분해작용을 거쳤으며, 이로 인해 점성과 비중이 높은 초중질유를 분지 남쪽 경계부인 오리노코 지역에 형성하였다. 주요 초중질유 저류층인 마이오세 오피시나층은 하성-에스츄어리 퇴적환경에서 발달한 미고결 사질 및 이질이 교호하는 퇴적체이다. 또한 오피시나층은 판의 운동에 의한 압축작용과 분지침강에 의해 형성된 다수의 신생대 단층이 분포하여 복잡한 저류층 지질 특성을 나타낸다. 불균질한 저류층 암상 분포와 복잡한 지질 구조의 저류층에서 경제적인 생산정의 설계와 효율적인 초중질유 회수를 위해서는 초중질유 저류층의 발달 과정과 그로 인한 지질학적 특성에 대한 심도 깊은 이해가 필요하다. 본 연구에서는 오리노코 초중질유 저류층에서 (1) 사질 저류층 두께 및 분포, (2) 이질 퇴적층의 분포, (3) 단층의 기하학적 분포, (4) 저류층 대상 심도 및 지열 특성, (5) 저류층 지중 응력상태, (6) 초중질유의 화학적 조성 등을 초중질유 생산성에 상대적으로 큰 영향을 미치는 주요한 지질학적 특성으로 주목하였다. 이러한 오리노코 지역의 지질학적 특성들은 3차원 탄성파 탐사, 시추간 물리검층과 같은 최신 기술들을 통해 앞으로 보다 빠르고 정확하게 규명되어질 것으로 기대된다.

위상 이미지 상관기법을 이용한 시준거울의 자동정렬

김현석,김대석,이형철,김수현,Kim, Hyun-Suk,Tserendolgor, D.,Kim, Dae-Suk,Lee, Hyung-Chul,Kim, Soo-Hyun 한국광학회 2011 한국광학회지 Vol.22 No.1

본 연구에서는 현재 대부분 작업자에 의해 수동으로 이루어지고 있는 단색화장치 내 광학 요소간 광학정렬을 높은 반복도와 고속으로 수행할 수 있는 자동화 방안에 대해 논의하고자 한다. 단색 분광기의 시준거울 자동정렬을 위해 CCD센서를 이용한 위상이미지 상관기법을 핵심기술로 사용하였다. 실험결과 약 10초 내에 시준거울을 정밀하게 자동정렬 할 수 있다. A novel alignment method that can be used for aligning the collimating mirror employed in a monochromator is described. In most of the spectrometer industry, the alignment of optical components such as a focusing mirror, a grating and a collimating mirror has been performed manually so far. In this paper, we use a matchedfilter based image correlation technique for measuring the accurate image position which is used for aligning the collimating mirror. The experimental results show that with the proposed scheme automatic alignment can be completed within 10 seconds.