휴대폰 카메라용 자동초점 구동기의 충격해석

이성민,김봉석,송준호,이수훈,이혜진,이문구,송준엽,이창우 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

Recently, the robustness against daily impact is important according to portablization and downsizing of mobile electronics. Especially, almost parts of cellular phone should undergo drop test when they fall 1.5 m above ground. This test simulates the case when cellular phone slips through user's fingers while he is talking on the phone. This paper studies a drop test of auto focusing (AF) actuator for camera module in cellular phone. This component is composed of voice coil motor (VCM) as an actuator and leaf spring as a guide and suspension. The leaf spring's deformation is essential for the test because its permanent distortion disables the focusing, and then, a high quality photograph cannot be obtained. Up to now the drop test has been carried out after fabricating real AF actuator. We propose a dropt test model which simulates the drop test based on finite element analysis. This model makes us enable investigate the stress acting on the clamping and curved parts of leaf spring. Stress over Von Mises criterion lets the spring deformed permanently, and then AF actuator malfunctioned, It helps us to design and modify AF actuator without manufacturing the real product. And also, it saves the time and cost for the development of new products.

췌장 선방세포암 1예

이화정,지준호,박승찬,박정철,최은정,서혜진,이원식,이정림,배병조,손경락,이경희 영남대학교 의과대학 2008 Yeungnam University Journal of Medicine Vol.25 No.2

Acinar cell carcinoma is a rare tumor that represents 1~2% of al1 pancreatic cancers. Clinical and radiologic findings are inconclusive in this disease Acinar cell carcinoma is characterized by rapid progression and early metastasis, which lead to its poor prognosis. A 41-year-o1d man was admitted to our hospital for abdominal pain. Abdominal computed tomography (CT) and positron emission tomography-computed tomography (PET-CT) showed a splenic mass, which was being invaded by a pancreatic tail mass and which had increased ^(18)F-fluorodeoxyglucose (FDG) uptake Primary radical distal pancreatectomy and splenectomy were performed. Pathologic findings revealed an acinar cell carcinoma of the Pancreas The patient underwent a total gastrectomy three months later because of gastric recurrence Four months later, multiple hepatic metastases were discovered, and the patient underwent a left hepatectomy During treatment with capecitabine, there was no evidence of tumor progression for 14 months. We report a case of metastatic pancreatic acinar cell carcinoma, which did not progress for an extended period while the patient was being treated with capecitabme.

품종별 감꽃 동결건조 분말의 유효성분 분석

김준한 ( Jun Han Kim ),박석희 ( Seok Hee Park ),문혜경 ( Hye Gyeong Mun ),이인선 ( In Seon Lee ),김종국 ( Jong Kuk Kim ) 한국식품저장유통학회 ( 구 한국농산물저장유통학회 ) 2006 한국식품저장유통학회지 Vol.13 No.6

감 품종별(도근조생, 고종시, 갑주백목, 차랑, 월하시, 상주둥시)로 감꽃을 개화기에 채취하여 동결건조 분말화한 감꽃분말에 함유된 유효성분을 분석, 비교하였다. 조지방 함량은 도근조생이 57.26%로 가장 높은 값을 보였으며, 유리당 조성은 fructose가 95~310 mg%, glucose는 75~281 mg%, sucrose가 7~28 mg%의 함유량을 나타내었고, 유기산 중 malic acid가 갑주백목(6월4일)에 225 mg%로 가장 많았고, tartaric acid도 189 mg%로 가장 많았다. 유리아미노산 중 hydroxy-L-proline은 월하시에 25.33 mg%, L-citrulline은 상주둥시(5월28일)가 58.83 mg%, L-threonine은 상주둥시(5월28일)가 11.88 mg%로 가장 많았다. 페놀산으로 caffeic acid는 갑주백목(6윌4일)이 1946 μg/100 g, phydroxybenzoic acid는 상주둥시(5월29일)가 417.8 μg/100 g, protocatechuic acid는 갑주백목(6월1일)이 181.1 μg/l00 g으로 가장 많았다. 따라서 감꽃에도 감이나 감잎에 못지않게 유용한 식품성분들과 기능성 성분들이 다량 함유되어 있어 새로운 식품 및 기능성 신소재로서의 가치가 매우 높다고 할 수 있다. This study was carried out to analyze useful components in freeze-dried persimmon flower powder made from six cultivars. The cultivars were Dogunjosang, Kojongsi, Kabjubaekmok, Chalang, Weolhasi and SangjuDungsi. Powder of persimmon flower was prepared by milling after freeze drying at -70℃. Crude lipid was the highest in Dogunjosang (57.26%). Major free sugars of the persimmon flowers were fructose (95~310 mg%), glucose (75~281 mg%)and sucrose (7~28 mg%). Major organic acids were malic acid (225 mg% in Kabjubaekmok (Jun. 4th)) and tartaric acid (189 mg% in Kabjubaekmok (Jun. 4th)). Predominant free amino acids were hydroxy-L-proline(25.33 mg% in Weolhasi), L-citrulline (58.83 mg% in SangjuDungsi (May 28th)) and L-threonine (11.88 mg% in SangjuDungsi (May 28th)). Major phenolic compounds in the persimmon flowers were caffeic acid (1,946 μg/100g in Kabjubaekmok (Jun. 4th)), p-hydroxybenzoic acid(418 μg/100g in SangjuDungsi (May 29th)) and protocatechuic acid(181 μg/100g in Kabjubaekmok(Jun. 1st)). The results suggest that persimmon flowers be potential materials as useful food ingredients.

원발성 후복막 점액낭샘암종 1예

지준호,이화정,박승찬,박정철,최은정,서혜진,이원식,이정림,배병조,손경락,이경희 영남대학교 의과대학 2008 Yeungnam University Journal of Medicine Vol.25 No.2

Primary retroperitoneal mucinous cystadenocarcinoma is a very rare malignancy, and little is known concerning its Pathogenesis, optimal treatment, and prognosis. A 29-year-o1d pregnant woman (21 weeks) Presented with abdominal discomfort CA 19-9, CA 125, and CEA were normal Abdominal CT scanning revealed a 19x15x13 cm retropentoneal tumor Exploratory laparotomy and tumor excision were performed. Mucinous retropentoneal implants were removed as completely as possible Histologically, the tumor showed focal areas of capsular invasion, but free resection margins The uterus and both ovaries were normal in appearance No adjuvant therapy was pursued. Six months later, Peritoneal and bilateral ovarian metastases were discovered. Hence, we report the details of this case of primary retroperitoneal mucinous Cystadeno-carcinoma and present a review of the literature.

한국비서자격시험의 개선점과 비교연구

남자현,이미정,이미영,이아영,정해금,최유정,이미숙,전인선,정혜림 이화여자대학교 법정대학 비서학과 1997 비서학연구 Vol.- No.17

Pneumatosis intestinalis and portal venous gas secondary to gefitinib therapy for Lung adenocarcinoma

( Joo Young Lee1 ),( Hye-suk Han ),( Sung-nam Lim ),( Young Kwang Shim ),( Yong Hyeok Choi ),( Ok-jun Lee ),( Ki Hyeong Lee1 ),( Seung Taik Kim ) 대한내과학회 2011 대한내과학회 추계학술대회 Vol.2011 No.-

복합적인 레지스트 패턴 붕괴현장의 역학적 해석

이형주,박준택,안일신,김옥근,오혜근 한양대학교 이학기술연구소 2003 이학기술연구지 Vol.6 No.-

패턴의 선폭이 100nm이하로 작아짐에 따라 패턴이 부러지고, 휘고, 떨어져 나가는 현상이 발생하는데 이러한 현상을 패턴 붕괴 현상이라고 하며, 반도체 생산과 수율에 많은 영향을 미친다. 패턴 붕괴 현상은 리소그래피 과정 중 현상 후 세척액을 건조하는 과정에서 주로 발생하며 세척액의 표면장력에 의한 모세관 현상이 주된 원인으로 알려져 있다. 패턴 붕괴 현상을 시뮬레이션하기 위하여 패턴이 세척액에 의해서 균일한 압력을 받을 때와 집중 압력을 받을 때의 역학적 모델을 세우기 각각의 모델을 통하여 선폭과 패턴간의 거리에 따른 임계 높이/선폭비 (aspect ratio) 를 계산하여 실제 실험 결과와 일치하는 모델을 선정하였다. 또한 패턴 내부에 생기는 stress 에 의한 부러짐 현상과 패턴 과 레지스트 패턴 하부 층 사이의 접착력 부족으로 발생하는 떨어짐 현상을 해석하였다. High aspect ratio resist patterns with dimensions below 100 nm often bend, break or tear. These phenomena are generically called "resist pattern collapse". Pattern collapse is a very serious problem in fine patterning of less than 100 nm critical dimension (CD), so that it decreases the yield. In order to mechanically analyze this phenomenon and create its simulator, two models have been made and compared. In this paper, various approaches with various analyses are made to understand pattern collapse. Also, the critical aspect ratio for 100 nm node, that determines whether pattern collapse happens or not, can be calculated with these approaches. Finally, tear type caused by insufficiency of adhesion strength between the substrate and the resist is analyzed with a point of view of the surface free energy.

고양이에서 영양학적인 원인에 의해 발생한 속발성 부갑상선기능항진증 1례

이혜원,박성준,김명철,정성목 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2009 動物醫科學硏究誌 Vol.16 No.1

A 10 month-old Korean domestic shorthaired cat(male, 1.4kg)was admitted to the Veterinary Medical Teaching Hospital of Chungnam National University with the history of astasia the onest of which was 3 month ago and all-meat diets. Physical examination revealed thin, growth retarded and lying in lateral recumbency. Radiograph showed abnormally radiolucent bones, thin cortices, kyphosis and lordosis of the spine and multiple fractures of the femurs. Result of serum biochemical test revealed mild hypocarcemia. Serum parathormone and 1, 25(OH)2-vitamin D3 levels were markedly elevated, whereas 25(OH)-vitamin D3 level was in normal range. Nutritional secondary hyperparathyroidism was diagnosed by history taking, physical examination, laboratory examination and radiography. Calcium gluconate with balanced commercial cat food was given. On 24 days later, improvements were found in clinical signs and radiographs.

패턴 Top Rounding 효과를 고려한 패턴 붕괴 전산모사

이형주,박준택,오혜근 한양대학교 이학기술연구소 2002 이학기술연구지 Vol.5 No.-

패턴의 선폭이 100 nm 이하로 작아짐에 따라 발생하는 패턴의 붕괴 현상은 반도체생산과 수율에 많은 영향을 미친다. 패턴 붕괴 현상은 리소그래피 과정 중 현상 후 세척액을 건조하는 과정에서 주로 발생하며 세척액의 표면장력에 의한 모세관 현상이 주된 원인으로 알려져 있다. 패턴 붕괴 현상을 시뮬레이션하기 위하여 패턴이 세척액에 외해서 균일한 압력을 받을 때와 집중 압력을 받을 때의 역학적 모델을 세우고 각각의 모델을 통하여 선폭과 패턴간의 거리에 따른 임계 높이/선폭비 (aspect ratio)를 계산하여 실제 실험 결과와 일치하는 모델을 선정하였다. 시뮬레이션 결과 패턴의 top 부분이 둥근 (rounded top) 패턴이 각진 (flat p) 패턴에 비해 변형이 줄어들 수 있다는 것을 확인할 수 있었다. The pattern size is reduced as the device is more integrated. The resist deformation phenomenon has been a serious problem under 100 nm line width pattems. The most applicable model for an existing empirical result is chosen to create a simulation tool by comparing the two mechanical models when a pattern receives a distributed pressure or a concentrated pressure from the rinse liquid. Based on the chosen model, the critical aspect ratio with respect to line width and space can be calculated. The simulated results show that the pattern collapse phenomenon is reduced for a rounded top resist profile rather than for aflat top profile

Glycyrol의 면역세포 활성효과 및 항진균 효과

이주영,박지혜,김송이,이주희,한용문 동덕여자대학교 종합약학연구소 2006 동덕약학연구지 Vol.10 No.-

In this study, we determined proliferate effect on T-lymphocytes and antifungal activity of glycyrol that was isolated from Glycyrrhizae Radix (Leguminosae). In addition, immunoadjuvant activity of glycyrol was determined. Results showed that Gylcyrol (GCR) suppressed the proliferation of murine splenocytes that were treated with Concanavalin A (Con A). In case of the immunoadjuvant effect, glycyrol had no enhancement on antibody production. Data from experiments of antifungal activity in vitro, the component resulted in inhibition of Candida albicans growth. The antifungal effect appeared to be more potent than fluconazole. These data indicate that Glycyrol has no specific immunological effect on T- and B-cells, but the component contains antifungal activity.