초정밀 나노 분급기 개발에 관한 연구

성백섭,윤길하,차용훈 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-

Nanotechnology is the creation and utilization of materials, devices, and systems through the control of matter on the nanometer-length scale, that is, at the level of atoms, molecules, and supramolecular structures. The essence of nanotechnology is the ability to work at these levels to generate larger structures with fundamentally new molecular organization. These nanostructures, made with building blocks understood from first principles, are the smallest human-made objects, and they exhibit novel physical, chemical, and biological properties and phenomena. The aim of nanotechnology is to learn to exploit these properties and efficiently manufacture and employ the structures. Control of matter on the nanoscale already plays an important role in scientific disciplines as diverse as physics, chemistry, materials science, biology, medicine, engineering, and computer simulation. This paper describes the superprecision nano separator to productive particle size of nano powder, this separator system is very important in the industrial area for other high technology parts.

인체 체액내 황색포도상구균의 증식과 철 획득 기전

신성희,이강길,이명희,양남웅,임용,김진호 대한감염학회 2000 감염 Vol.32 No.5

골반내에 발생한 Proximal-type 유상피성 육종 1예

길준철,이상수,전병화,김성훈,손우석,목정은,박양순,강길현 대한부인종양 콜포스코피학회 2003 Journal of Gynecologic Oncology Vol.14 No.4

유상피성 육종은 매우 드문 악성 연조직 육종으로, 전형적인 경우들은 주로 젊은 남성의 수부, 전완부와 같은 신체의 원위부에 피하 혹은 심재성 피부 종괴로 발생하며, 조직학적 소견상 적은 비정형성을 나타내는 유상피성 세포와 방추형 세포의 증식에 의한 다발성 결절 형태의 배열을 보인다. 최근에 전형적인 유상피성 육종과 조직학적 유사성을 가지나 더 공격적인 형태인 proximal-type 유상피성 육종이 보고되었으며, proximal-type은 전형적인 유상피성 육종에 비하여 현저한 유상피성 세포의 발현과 매우 심한 비정형성을 나타내며, 세포가 매우 크고, 소포성 핵과 뚜렷한 핵소체를 보이며, 자주 rhabdoid 세포의 양상을 띈다. 임상적으로는 전형적인 형태에 비하여 호발 연령이 조금 늦고, 주로 체간부에, 특히 골반, 회음부, 생식기 등과 같은 심부에 발생하고, 더욱 공격적인 양상을 나타낸다. 저자들은 13세 소녀에서 원발부위를 알 수 없는, 골반내에 발생한 proximal-type 유상피성 육종 1예를 경험하여, 문헌 고찰과 함께 보고하는 바이다. Epithelioid sarcoma is a rare malignant soft-tissue sarcoma with an unknown histiogenesis, typically presenting as a subcutaneous or deep dermal mass lesion in the distal portions of the extremities of young adults. Recently, a more aggressive, so-called 'proximal-type' epithelioid sarcoma has been reported. In contrast to conventional epithelioid sarcoma, the proximal type is characterized by a predominantly large cell epithelioid cytomorphology, marked cytologic atypia, and frequent occurrence of rhabdoid features in most patients. Proximal-type epithelioid sarcoma has a predilection for appearing in the genitalia, especially the vulva, penis, pelvis and buttocks. Also this lesion appears to be somewhat more aggressive or at least metastasizes earlier than the conventional epithelioid sarcoma. We report a 13-year-old girl who presented with a buge mass filling the pelvic cavity which was painful, hard and fixed on palpation, and was radiologically diagnosed as a malignant germ cell tumors on the CT scan. The mass was surgically excised and pathologically proved to be an proximal-type epithelioid sarcoma of unknown origin.

높은 지향성을 갖는 Air Line 결합기 설계

길준범,이성원,최영호,박종임,안달,박준석 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1

본 논문에서는, 일반적인 스트립 구조의 결합기가 갖는 문제 즉, 높은 온도에서 나쁜 특성을 보이는 문제점을 극복하고자 Air Line Type의 결합기를 구현하였다. 또한 이 결합기는 24dB이상의 지향성을 가지고 있다. 해석을 위해 짝수 모드와 홀수 모드 해석법을 사용하였고, EM-Simulation으로 확인한 특성과 실제 제작된 20dB, 30dB Cellular 대역(800∼900MHz) Air Line 결합기의 결고 특성은 좋은 일치를 보여주고 있다. 또한 최대 장점인 온도 특성은 온도 데이터를 통하여 온도에 강한 특성을 보임을 알 수 있다.

대장암 근치적 절제술후 재발양상에 관한 임상적 연구

이길연,홍성화,고석환,윤충,고영관,이기형,박주철 대한대장항문학회 1996 Annals of Coloproctolgy Vol.12 No.2

生命保險 募集組織의 生産性 提高에 관한 硏究

성태현,이병석,김길종 慶南大學校 産業經營硏究所 1999 産業經營 Vol.24 No.-

흰쥐 간의 재생에 관한 세포화학적 연구

길영천,김완종,한상철 순천향대학교 기초과학연구소 1998 순천향자연과학연구 논문집 Vol.4 No.2

The present study was designed to evaluate the regeneration process, the localization of metallothionein(MT) and alkaline phosphatase(ALP), and the liver function during the liver regeneration of rat. The weight of control rat liver was about 4.3% of body weight. But after hepatectomy, the remaining liver weight was about 1.3% of body weight. The remaining liver seemed to begin regenerating at 24 hours after partial hepatectomy, and to complete at 7∼10days after hepatectomy. In control rat liver, metallothionein(MT) was scarcely found in the cell. But MT was found in both the cytoplasm and the nucleus of hepatocyte at 6 hours after hepatectomy, and MT reaction was found in the cytoplasm of liver at 24 hours after hepatectomy. From 5 days after hepatectomy, MT reaction became weak in the cytoplasm of hepatocytes. In control rat liver, the reaction products of alkaline phosphatase(ALP) were scarcely found in the nucleus. But in the experimental group, ALP was found at the membrane of hepatocyte contacted with the lumen. Activities of glutamate oxaloacetate transaminase(GOT) and glutamate pyruvate transaminase (GPT) of serum increased until 24 hours after hepatectomy, then returned to the normal level in about 2 days after hepatectomy. In conclusion, It is suggested that regenerating hepatocytes reveal characteristics of typical cell proliferation and carry out normal function.

개불에서 Hox 유전자의 동정 및 계통분석

신길상,이대희 순천향대학교 기초과학연구소 2004 순천향자연과학연구 논문집 Vol.10 No.2

An echiuriod species, Urechis unicinctus, was surveyed for Homeobox(Hox) genes using PCR with Homeobox-specific degenerate primers. We were able to identify five Hox genes. The results revealed that the five Hox genes were belonged to central group of body plan-genes in the echiuroid. Analyses in this work made it able to classify the five Hox genes comparatively and phylogenetically, and came to the conclusion that the echiuroid can be classified one of lophotrochozoan. The result may be the first report regarding sequence information and phylogenetic analysis of Hox genes in the echiuroid species.

유무선 통합 네트워크 기술 개발

한길성 서원대학교 미래창조연구소 2004 과학과 문화 Vol.1 No.1

The fixed-mobile network convergence is adapted to network structure of international trends by the change of communication environment The number of mobile communication and internet has increased dramatically, the network of existing fixed telephony must be developed in mobile network with new network model. Fixed-mobile convergences are classifyed by network convergence, service convergence and commercial convergence. These are converged dependently and service & commercial convergence are caused by network convergence among many types of convergences Therefore, the type and technic of network convergence are studied and technical developing prospect is suggested in this paper.

증기발생기 전열관 검사를 위한 차동형 원격장와전류 탐촉자 설계

신영길,신상호,정태언 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-

As steam generator (SG) tubes have aged, new and subtle flaws have appeared. Most them start growing from outside the tubes. To find outer diameter defects more easily, the author had shown that the remote field eddy current (RFEC) technique, which had shown equal sensitivity to inner diameter (ID) and outer diameter (OD) defects, is feasible for the inspection of SG tubes. Based on the results obtained in that study, this paper designed a differential RFEC probe and studied the characteristics of differential RFEC signal. Finite element modeling studies show that the differential signal still has the equal sensitivity to ID and OD defects and at the same time it is possible to distinguish one from the other. Also noticed is that there is few degrees of signal rotation but sensitive changes in signal length when the depth of small defect varies. If the volume of defect is large, the changing rate of signal length is higher than that of defect size variation. The characteristics of signal show that the proposed differential RFEC technique can be a good alternative for the initial inspection of SG tubes.