[논문]Operational Characteristics of CO2 Laser Adopted by Superposing-Discharge

Hee-Je Kim,Hyun-Ju Chung,Byoung-Dae Min,Jong-Han Joung,Sung- lun Park 釜山大學校生産技術硏究所 2003 生産技術硏究所論文集 Vol.62 No.-

오늘날 현저한 CO2 레이저의 응용 추세에 발맞추어 보다 다양한 형태의 출력 제어 기술이 대두되고 있다. 본연구에서는multi-Pulse Superposing-Discharge 기술을 이용하여 다양한형태의 CO2 레이저의 펄스를 성형 하였다. 펄스 성형을 위한 방법으로 PIC one-chip microprocessor를 이용하여 삼중 PFN 모률의 SCR을 각각 고유의 지연시간을 가지도록 제어하였다. 실험에 사용된 삼중 PFN 모률의 전원 회로는 각각 캐패시터 인덕터,SCR,고압 펄스 트랜스 그리고 고압 트랜스 2차측에 브릿지 정류기로 구성 하였다. 고압 펼스 트랜스의 1차측을 제어하므로서 PFN 모률의 동작을 저 전압에서 수행 할 수 있다. 트랜스의 2차측에 연결된 전파 정류기는 펄스 에너지를 부하에 지속적으로 전달한다. 본 연구에서는 삼중 PFN 모률의 각각의 SCR을 다른 시간 가격을 두고 트리거 하므로서 다양한 Long pulse shaping을 실현하였다. 또한 약 250-1000μs 의 주기를 가지는 다양한 펄스형 레이저 빔을 얻었다.

An Improved Speech Processing Strategy for Cochlear Implants Based on an Active Nonlinear Filterbank Model of the Biological Cochlea

Kim $^$, Kyung Hwan,Choi, Sung Jin,Kim, Jin Ho,Kim, Doo Hee IEEE 2009 IEEE Transactions on Biomedical Engineering Vol.56 No.3

<P>The purpose of this study was to improve the speech processing strategy for cochlear implants (CIs) based on a nonlinear time-varying filter model of a biological cochlea. The level-dependent frequency response characteristic of the basilar membrane is known to produce robust formant representation and speech perception in noise. A dual resonance nonlinear (DRNL) model was adopted because it is simpler than other adaptive nonlinear models of the basilar membrane and can be readily incorporated into the CI speech processor. Spectral analysis showed that formant information is more saliently represented at the output of the proposed CI speech processor compared to the conventional strategy in noisy conditions. Acoustic simulation and hearing experiments showed that the DRNL-based nonlinear strategy improves speech performance in a speech-spectrum-shaped noise.</P>

On the Interpretive Complex Phenomena in terms of Apparent Imperfections

Kim, Sung Hun,Choe, Hee Sook 한국현대언어학회 2001 언어연구 Vol.17 No.1

Kim, Sung-Hun & Choe, Sook Hee. 2001. 의미해석 복합체에 관한 고찰: 외견상 비완벽성을 중심으로. 언어연구 17-1, 297-311. 본 논문에서는 Chomsky(1998, 1999)의 외견상 비완벽성 개념에 의하여 설명될 수 있는 문법 현상인 의미해석 복합체에 관하여 조사한다. 한국어의 격 첨사들이 초점과 같은 정보 구조에 미치는 효과들을 최소주의 이론에서 어떻게 설명하고 있는지를 논의한다. 특히, 어떤 문맥에서는 격 첨사의 초점 정보 효과들이 외견상 비 완벽성에 의하여 포착되는 의미해석 복합체 현상(Chomsky 1999)이라고 제안한다. 또한 한국어에서 어떤 장거리 뒤섞기 현상들은 외견상 비완벽성에 기인하는 정보 구조 효과를 일으키는 것으로 간주한다. 다시 말해서, 장거리 뒤섞기는 비완벽성이지만 장거리 뒤섞기의 초점 효과들은 외견상 비완벽성을 이끈다고 주장한다. (단국대학교/한국과학기술원)

Assessment of In Vitro Assay System for Thyroid HormoneDisruptors Using Rat Pituitary GH3 Cells

Hee Jin Kim1,Hae Young Park1,Jeonga Kim1,Il Hyun Kang2,Tae Sung Kim2,Soon Young Han2,Tae Seok Kang2,Kui Lea Park2,Hyung Sik Kim1 한국독성학회 2006 Toxicological Research Vol.22 No.4

The development of in vitro assays has been recommended to screening and test-ing the potential endocrine disruptors (EDs). These assay systems focus only on identifying thethe thyroid hormone (TH) disruptors. The aim of this study was to evaluate a test system to detectTH disruptors using rat pituitary tumor GH3 cells. The test system is based on the TH-dependentincrease in growth rate. As expected, L-3,5,3-triiodothyronine (T3) markedly induced a morphologicalchange in GH 3 cells from flattened fibroblastic types to rounded or spindle-shaped types. T3 stimu-lated GH3 cell growth in a dose-dependent manner with the maximum growth-stimulating effect9 M. In addition, T3 increased the release of growth hor-mone and prolactin into the medium of the GH3 cells culture. Using this assay system, the TH-dis-rupting activities of bisphenol A (BPA) and its related compounds were examined. BPA,dimethylbisphenol A (DMBPA), and TCI-EP significantly enhanced the growth of GH3 cells in therange of 1 × 10-5M to 1 × 10-6M concentrations. In conclusion, this in vitro assay system might bestandardization before it can be used as a broad-based screening tool.

The Effect of Bench-Step Exercise Training for 16 Weeks on Risk Factors for Metabolic Syndrome in Middle Aged Obese Women with Hypertension

Kim, Junghoon,Jeong, Nan-Hee1,Nho, Ho-Sung 한국운동영양학회 2003 Physical Activity and Nutrition (Phys Act Nutr) Vol.11 No.3

Reactive Oxygen Species Generated by 17β-estradiol Play a Role in the Up-regulation of GPX4 Protein in MCF-7 Breast Cancer Cells

Sang-Han Lee,Hee Jeong Kim2,Hyo Jin Kang,이윤진,남해선,배인수 한국유방암학회 2009 Journal of breast cancer Vol.12 No.3

Purpose: Estrogen is known to act as both a growth factor and a survival factor for breast cancer. The responsible molecular mechanisms remain, however, to be fully elucidated. We hypothesize that the effect of estrogen relates to its ability to induce the cellular antioxidant defense enzymes. Methods: In the presence study, we examined the ability of 17β-estradiol (E2) to regulate the level of phospholipid hydroperoxide glutathione peroxidase (GPX4) protein, which is an anti-oxidative enzyme that can directly reduce both phospholipids and cholesterol-hydroperoxides located in the cell membranes and lipoproteins. Results: E2 elicited a dose- and time-dependent increase in the GPX4 expression in the MCF-7 breast cancer cells, and this up-regulation was blocked by the free radical scavenger N-acetylcysteine (NAC). Additionally, we confirmed that E2 triggered a rapid and transient increase in the intracellular reactive oxygen species (ROS) levels, and this E2-induced increase in the ROS levels was inhibited by pretreatment with NAC. Moreover, such ROS inducers as TGF-β, TNF-αand insulin induced an increase in the level of GPX4 protein. However, estrogen receptor (ER)αknockdown by transfection with ERα-siRNA did not significantly change the GPX4 protein level that was induced by E2. Furthermore, pre-incubation with the ER antagonist ICI 182,780 did not inhibit E2-mediated GPX4 induction. Conversely, pretreatment of cells with LY294002, a pharmacological inhibitor of phosphatidylinositol 3-kinase inhibitor, suppressed the E2-augmented GPX4 expression. Conclusion: Collectively, our data show that E2 may partly provide a survival advantage through the regulation of cellular oxidative homeostasis in MCF-7 breast cancer cells.

Associations of serotonergic genes with poststroke emotional incontinence

Kim, Jae‐,Min,Stewart, Robert,Kang, Hee‐,Ju,Bae, Kyung‐,Yeol,Kim, Sung‐,Wan,Shin, Il‐,Seon,Kim, Joon‐,Tae,Park, Man‐,Seok,Cho, Ki‐,Hyun,Yoon, Jin‐ John Wiley Sons, Ltd 2012 INTERNATIONAL JOURNAL OF GERIATRIC PSYCHIATRY Vol.27 No.8

<P><B>Objectives</B></P><P>Poststroke emotional incontinence (PSEI) has been associated with serotonergic dysfunction. Polymorphisms of serotonin transporter (5‐HTT) and serotonin 2a receptor (5‐HTR2a) genes may regulate serotonergic signaling at brain synapses, and this study was to investigate associations with PSEI in an East Asian population.</P><P><B>Methods</B></P><P>In 276 stroke cases, PSEI was diagnosed by Kim's criteria. Covariates included age, gender, education, history of depression or stroke, current depression, and stroke severity and location. Genotypes were ascertained for 5‐HTT gene‐linked promoter region (5‐HTTLPR), serotonin transporter intron 2 variable number tandem repeat, 5‐HTR2a 1438A/G, and 5‐HTR2a 102 T/C. Associations with PSEI were estimated by using logistic regression models, and gene–gene interactions were investigated by using the generalized multifactor dimensionality reduction method.</P><P><B>Results</B></P><P>PSEI was present in 37 (13.4%) patients. The 5‐HTT gene‐linked promoter region <I>s</I>/<I>s</I> genotype was independently associated with PSEI. No associations with STin2 VNTR and 5‐HTR2a genes were found, and no significant gene–gene interactions were identified.</P><P><B>Conclusions</B></P><P>Stroke patients with 5‐HTTLPR <I>s</I> allele had higher susceptibility to PSEI, which underlines the potential role of serotonergic pathways in its etiology. Copyright © 2011 John Wiley & Sons, Ltd.</P>

Studies on the Effects of Biomedicinal Agents on Serum Concentration of Ca2+ , P and ALP Activity in Osteoporosis-Induced Rats

Sang-keun Kim,Myung-hun Lee,Man-hee Rhee 대한수의학회 2003 Journal of Veterinary Science Vol.4 No.2

on the Effects of Biomedicinal Agents on Serum Concentration of Ca2+, P andALP Activity in Osteoporosis-Induced RatsSang-keun Kim, Myung-hun Lee1 and Man-hee Rhee2College of Veterinary Medicine, Chungnam National University, 220 Gungdong, Yusong-Gu, Daejeon 305-764, Korea1National Veterinary Research and Quarantine Service, Anyang 430-824, Korea2College of Veterinary Medicine, Kyungpook National University, Daegu 702-701, KoreaReceived April 3, 2003 / Accepted July 9, 2003J. Vet. Sci. (2003), 4(2), 151-154JOURNAL OFVeterinaryScience*Corresponding author: Sang-keun Kim Dept. of Vet. Med., Chungnam National University, Daejeon 305764, Korea Tel: +82-42-821-6754, Fax: +82-42-821-6754 E.-mail: kskkim@cnu.ac.kr

The Effect of Bench-Step Exercise Training for 16 Weeks on Risk Factors for Metabolic Syndrome in Middle Aged Obese Women with Hypertension

Kim, Junghoon,Jeong, Nan-Hee1,Nho, Ho-Sung 한국운동영양학회 2003 Physical Activity and Nutrition (Phys Act Nutr) Vol.7 No.1

염상섭 초기 소설의 변화 과정 고찰 -매체와의 상관성을 중심으로-

이희정 ( Hee Jung Lee ),김상모 ( Sang Mo Kim ) 한민족문화학회 2011 한민족문화연구 Vol.38 No.-

본고에서는 염상섭 초기 소설의 변화 과정을 고찰하면서 근대 초기 작가의 주 무대였던 ``매체``와 작품과의 상호영향에 특히 주목했다. 기존의 연구에서는 염상섭 초기소설의 변화 양상을 크게 ``내면적인 것에서 실제 현실에 대한 관심으로의 이동``이라는 측면에서 파악하였다. 그리고 이러한 변화의 내적 동인을 작가의 세계관의 변화라는 측면에서 분석하고 있다. 그런데 근대 초기의 작품들이 대부분 잡지와 신문을 통해 발표되었고, 이로 인해 작가들의 작품이 발표매체들과의 상호 영향 속에서 형성되었다는 점을 고려할 필요가 있다. 이 때 기존의 논의에서 좀 더 나아가 염상섭 초기 작품의 전개과정에 끼친 매체의 영향력을 짚어 볼 수 있다. 이러한 관점에서 본고에서는 『개벽』을 통해 발표된 염상섭의 작품이 당시 『개벽』이라는 잡지의 매체적 특성과 상호영향을 주고 받았으며, 이후 『동아일보』에 소설을 연재한 경험이 다시 『개벽』에 게재한 「금반지」와 「검사국대합실」의 창작에 많은 영향을 주었던 것을 밝히고자 했다. 형식적인 측면에서 볼 때 초기 소설에서는 한자가 남발되고 일본식 번역투의 문장이 나타났으나, 「금반지」와 「검사국대합실」에서는 이러한 것들이 거의 사라졌다. 내용적으로도 초기에 강하게 나타났던 내면에의 천착이 이후 풍속에 대한 관심으로 전환되었다. 이러한 현상은 바로 염상섭의 신문매체의 경험을 통해 이뤄진 것임을 알 수 있다. Existing studies grasped the changes of initial novel trend of Yeom Sang-Seop largely in the aspect of ``shift from internal things to the concern to actual reality``. Also, they analyzed inner motive occurring such change focused on the change of his view to the world. However, the part this article emphasizes is a mutual influence between ``media`` which was main stage of works for writers in the early of modern times and works. Works in the early of modern times were mostly published via magazines and newspapers, and due to this, writers` works were finally formed within mutual influences of publishing media. Even the progress of initial works of Yeom Sang-Seop was also influenced absolutely by such media. The work published via [Gaebyeok] was mutually influenced with media characteristics of magazine. Since then, the experience of Yeom to publish novel serially to [DongA Daily] effected much on the creation of [Gold Ring] and [Lobby of Investigation Bureau] published again on [Gaebyeok]. Overuse of Chinese characters and Japanism sentences which were shown on his initial works were mostly not shown on [Gold Ring] and [Lobby of Investigation Bureau]. Also, it can be said that the switch from detailed exploration to inner side to the concern to customs was made from his experience to such media including newspapers.