W-CDMA를 이용한 PCS 기지국용 RF 송신부의 설계 및 구현

진년강,백주기 단국대학교 1999 論文集 Vol.34 No.-

In this study, the wideband CDMA transmitter for PCS is designed and implemented. As a modulation method, the CC-OQPSK implemented as the ASIC and this modulation method has better spectral and power efficiency than conventional QPSK system because it has constant envelope characteristics. In the intermediate frequency stage using double-conversion scheme, good hamonics rejection characterisitics and gain of 20 ㏈ were obtained. The output power of two-stage RF amplifier is +21.14 ㏈m in 1.9㎓ band. It has been confirmed that the electrical characterisitics of the transmitter which is implemented in the paper satisfy with the specification of wideband CDMA transmitter that has been set to be the design standard of PCS.

증후성 단독 중뇌동맥협착의 예후

이수주,이광호,정진상,조수진,이원용,이한보 대한신경과학회 1999 대한신경과학회지 Vol.17 No.1

백서 좌골신경에 Glycerol이 미치는 조직병리학적 변화

김태주,김진수 慶北大學校 齒科大學 1990 慶北齒大論文集 Vol.8 No.1

The purpose of this experimental study was to examine and compare the histological changes when anhydrous glycerol and normal saline applied to the sciatic nerves of rats perineurally in vivo. For this study, 30 Sprague-Dawley male ablino rats were used as the experimental animals and divided into 6 groups. The topical application of anhydrous glycerol on the right nerve of rats for 1 day, 3 day, 1 week, 2 week, 3 week and 4 week were used in experimental groups Ⅰ,Ⅱ,Ⅲ, Ⅳ,Ⅴ,Ⅵ. Physiological saline on the opposite site was the control in groups Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ, Ⅵ. The animals were sacrified on the 1st and 3rd day, 1st, 2nd, 3rd, 4th weeks after experimentals and all specimens were fixed in 10% neutral formalin and 1% osmium tetroxide solution after, embedded in paraffin was and cross-sectioned with 4㎛. After these procedures, specimens were observed under the light microscope. The results obtained were as follows: 1. Our reselts show that myelin disintegration and axonolysis occur with glycerol application. 2. The degree of histological damage is proportional to the depth of penetration, and the fibers colsest to the perineurium showing maximal damage. 3. The maximal destruction of myelin were noted at one or two weeks. 4. There is no evidence of selective destruction of any groups of axons depending upon the degree of myelination, although myelin sheath shows the most striking histological change. J. Kyungpook Not. Univ. Sch. Dent. Vol.8, No.1, 51∼61, 1991.

敎育制度 硏究의 最近 動向 : 最近 10年間의 國內 動向을 中心으로

趙錦柱,鄭鎭環 東國大學校 敎育問題硏究所 1994 교육문제연구 Vol.9 No.-

북미자유무역협정의 정치경제학: 그 성격과 성과를 중심으로

임현진,이성형,송주명 서울대학교 국제지역원 1996 국제지역연구 Vol.5 No.2

이 글은 1994년도에 출범한 북미자유무역협정의 역사적 배경에서 출발하여 협정에 이르기까지의 각국의 협상 목표와 전략, 그리고 세계경제 전반에 미치는 영향과 협정의 주요 내용, 마지막으로 지난 3년간의 공과를 간단히 검토하고 있다. 세계적 차원에서 경제적 경쟁이 심화되면서 북미 3국은 기존의 상호의존성을 토대로 자유무역지대를 창출하는데 성공하지만 각국의 목표는 조금씩 다르다. 미국은 상대적으로 경제적 이익보다는 멕시코의 안정이라는 정치적인 목료를 고려하였고, 멕시코는 발전모델의 변경에 소요되는 재워조달이라는 경제적 이유가 가장 고려되었으며, 캐나다는 반면에 불참의 불이익을 회피하기 위해 북미자유무역협정에 가입하였다. 3년간 실험 끝에 역내의 무역창출 효과는 상당히 제고되었고 산업내 무역도 활발하게 전개되고 있지만 무역분쟁은 아짇고 크게 줄지 않고 있다. 초기의 낙관론과 달리 북미자유무역협정이 미주자유무역지대로 발전할 가능성은 상당히 약하다. This study examines the historical background of the NAFTA of 1994, negotiation targets and strategies of each country involved, its impact on the world economy as a whole, and its successes and failures over the past three years. While the three North American countries succeeded in establishing a free trade area based on reciprocity in the context of deepening economic competition in the world economy, the objectives of each country in this process slightly differ each other: The United States places more emphasis on a political objective-the stabilization of Mexico; Mexico is more interested in obtaining financial resources for remolding the existing economic development model; and Canada tried to avoid the possible economic disadvantages due to the boycott. After the three year economic experiment, the effect of trade creation within the trade area and intra-industry trade have been enhanced, whereas the trade disputes among the members still remain high. But the possibility of developing the NAFTA into the AFTA seems to be modest at the moment.

DDC,MEA,WR-2721의 放射線 防護效果에 關한 硏究

柳星烈,陳秀一,鄭鉉佑,鄭引溶,高柱煥,고경환 대한방사선 방어학회 1986 방사선방어학회지 Vol.11 No.2

放射線障害 豫防藥劑의 人體適用은 副作用으로 臨床的 利用이 되지 못한 實情으로서 生理學的 및 藥理學的 毒性, 物理學的 諸性質, 藥劑의 作用機轉究明 및 臨床的 技術開發이 未洽하여 放射線 障害者에 對한 治療는 對症療法에 不過한 實情이다. 著者들은 放射線에 依한 人體障害豫防에 必要한 基礎資料를 얻기 위하여 現在까지 比較的 毒性이 적고 化學的으로 安定하며 藥效가 優秀하다고 알려진 DDC, MEA, WR-2721을 選定하여 實驗動物 非近交系 Swiss Webster(NIH-GP)마우스에 利用한 放射線 防護作用에 關한 實驗結果는 다음과 같다. 1) 各種 放射線 防護劑(DDC, MEA, WR-2721)의 마우스에 대한 適定 投與量은 各各 DDC; 1,000, MEA; 200, WR-2721; 400mg/kg이었다. 2) 實驗動物에 放射線 反致死線量 LD50/10에 對한 藥劑의 防護效果을SMS DDC;1.2, MEA; 1.4, WR-2721; 1.9이었고 LD50/30에 對 한 DMF는 DDC; 1.7, MEA; 1.8, WR-2721; 2.5이었다. 3) 空腹 小?腺(Jejunum crypt)의 放射線平均致死線量(Do)에 對한 防護效果 DMF는 DCC; 1.07, MEA; 1.21, WR-2721; 1.76이었고, 小?腺細胞의 致死線 平均致死線量에 對한 DMF는 DDC; 1.04, MEA; 1.08, WR-2721; 1.38이었다. 4) 以上으로 上記 3種의 放射線 防護劑中 WR-2721의 放射線 防護效果가 가장 優秀하였고 이 結果는 向後 臨床的 適用에 關한 硏究의 基礎資料가 될 것으로 思料된다. At present, the treatments of the radiation-induced diseases are only performing by the palliative treatment technique. Moreover, radiation protective agents are a little toxic for human being and this seriously limits their applicability with various complications in clinical uses. Accordingly, as a part of the aim of gain of the basic data for protective roles of some radioprotectors, the present investingation was carried out to evaluate the comparative radioprotective effects by the administration of DDC, MEA, WR-2721. Results are shown for statistically significant analysis and correlation with each group as follows; 1. The proper doses of the radioprotectors were DDC; 1,550mg/kg, MEA; 450mg/kg, WR-2721; 780mg/kg of the mouse body weight. 2. DMF(Dose modification factor) of LD50/10 and LD50/30 for whole body irradiation was DDC; 1.2, MEA; 1.4, WR-2721; 1.9 and DDC; 1.7, MEA; 1.8 and WR-2721; 2.5 respectively. 3. DMF for radiation reaction of jejunal crypt was DDC; 1.07, MEA; 1.21 and WR-2721; 1.76 and that of jejunal crypt cell was DDC; 1.04, MEA; 1.08 and WR-2721; 1.38 respectively. 4. Conclusively, WR-2721 was the most effective drung among the three radioprotectors and this result must be a supportive data for further study for clinical application.

STS304 용접재의 피로거동에 관한 연구

李龍福,鄭鎭成,李柱翰 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.1

In this study, fatigue crack behaviors of STS304 weldment were invesgated when a crack propergated from tensile residual stress region or compressive residual stress region. Crack gowth rates were predicted and compares with experimental result. The experimental results are summarized as follows : 1. For the crack propagation from tensile residual stress region, the maximum residual stress at the crack tip redistributes greater than for the initial residual stress, and the point where the residual stress converted from tension to compression is transferred along the direction of cracking. 2. In the case of fatigue crack propagation from tensile residual stress region, the prediction line of crack growth rate by the initial residual stress declines sharply after middle region and the prediction line by the redistributed residual stress more approaches the experimental results. 3. The fatigue crack from compressive residual stress region has very low fatigue crack growth rate compare with the tensile residual stress region. Because it has low effective stress ratio in compressive residual stress region and it is not almost relaxed compressive residual stress during the cyclic loading. 4. The predicted fatigue crack growth rates considering effects of crack closure are in better agreement with the experimental results, in spite of variation of the residual stress. But there are regions where affected by material properties.

뇌 아밀로이드 혈관병과 고혈압성 뇌출혈의 감별에 있어서 Apolipoprotein Eε4와 점상 출혈 분포의 유용성

김용범,이광호,이수주,나덕렬,조수진,정진상,이원용 대한신경과학회 1999 대한신경과학회지 Vol.17 No.1

Parapharyngeal Space에 발생한 Pleomorphic Adenoma의 치험례

장신남,백민주,김진수,변기정 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.2

본 교실에서는 발생이 드문 부인두간극에 발생한 다형성 선종을 악하절개와 하악지 부위의 하악골 절단을 행한 이후에 둔적박리(blunt dissection)를 이용하여 종물과 주위의 구조물을 외과적으로 절제하였으며, 3년간의 추적 조사 결과 재발의 양상 없이 양호한 결과를 얻었기에 문헌고찰과 함께 보고하는 바이다. Pleomorphic adenoma is the most common of the benign salivary gland tumors. Pleomorphic adenoma accounts for 60% of all parotid gland tumors, 50% of submandibular gland tumors. and only 25% of sublingual gland neoplasms. Fifty percent of all oral minor gland tumors are pleomorphic adenomas of which 55% arise in the palate, 25% in the lip, 10% in the buccal mucosa, and 10% from all other oral and oropharyhgeal sites. The presence of tumors within the parapharyhgeal space is rare. Some investigators have reported pleomorphic adenomas originating in the deep lobe of the parotid gland advancing to involve this region, as well as primary pleomorphic adenomas of nonparotid origin. We present a case report of pleomorphic adenomas in the parapharyhgeal space with literature review. The tumor was completely removed under general anesthesia via submandibular incision with the division of mandible.

A Nature of the Novel : Pursuit of the Novelty

Chin, Sheon Joo 한국현대영어영문학회 1983 현대영어영문학 Vol.24 No.1