반송용 편측식 선형기기의 추력제어에 의한 특성해석

우정인,신동률,조용길,노태균 東亞大學校 大學院 1999 大學院論文集 Vol.24 No.-

본 논문에서는 PWM 인버터 구동 편측식 선형유도 전동기(이하 SLIM)의 공간백터 제어와 PI 제어를 통한 추력 제어를 행한다. 1차측 권선과 SLIM의 2차측 구조 사이에서 발생하는 공극길이의 떨림은 빠른 응답특성을 얻기위해서 최소화 되어야 한다. 먼저, SLIM의 전압방정식이 추력과 수직력 특성을 해석하기 위하여 d-q축 등가회로로서 나타내어진다. 또한, d-q축 등가회로의 모델링과 해석은 등가회로상에서 전류변동에 따른 강인한 과도 추력특성을 얻을 수 있다. 지령속도와 추력에 의한 SLIM의 직접구동 결과는 실험을 통해서 확인된다.

공간벡터변조에 의한 반송용 편측식 선형유도전동기의 센서리스 속도제어

우정인,노태균,신동률,고성현 東亞大學校 附設 情報通信硏究所 1997 情報通信硏究所論文誌 Vol.5 No.1

Space Vector control of linear induction motor without speed sensor is one of the most up-to-date researching subjects to the engineers in the fields of power electronics and control theory. A conveyance SLIM(Single-sided Linear Induction Motor) has required a stable speed and a soft start/atop when the goods convey. So, the close loop control method to use a speed sensor have been adopted and as the speed sensor, a linear encorder has been used. But when the speed sensor used, the application boundary is limited and the confidence of system is diminished because it is sensitive to external environment variations and its cost is very expensive. So to solve these problems, this paper deals with speed control of the conveyance SLIM using space vector without speed sensorless.

PSCD를 이용한 NOx 저감에 대한 C₂H₄ 가스의 첨가효과에 대한 연구

신철수,강우정 충주대 산업과학기술연구소 1998 産業科學論文集 Vol.6 No.-

The purpose of this study is to investigate the reduction rate of NOx according to sever al parameters(NOx concentration, the flow rate of gas, the additional amount of C2H4, input voltage, input frequency and so on) when NOx is reduced by using PSCD(Pulse Streamer Corona Discharge). PSCD is based on the plasma-chemical technology, which induces narrow voltage pulses to binary electrode structure.

인듀서 내부의 캐비테이션 유동과 흡입성능에 관한 연구

申澈洙,金鍾喆,姜宇政,李先基 충주대 산업과학기술연구소 1995 産業科學論文集 Vol.3 No.-

In order to understand the influence of the inducer inlet angle on cavitation and suction performance, experiments were carried out for two kinds inducer, which have the same outlet angle distribution, length and number of inducer blades. The results showed that the change of inducer inlet angles influenced not only internal flow conditions but also cavity flow and suction performance. The improvement of suction performance by using inducer were also discussed.

영구자석형 선형동기전동기의 위치제어를 위한 가변구조 벡터제어 시스템에 관한 연구

우정인,신동률,허태원,조광승 東亞大學校 2000 東亞論叢 Vol.37 No.-

OA, FA기기 등에 에너지 밀집도를 높일 수 있는 영구자석형 선형동기전동기(PMLSM)를 적용하고자하는 연구가 활발하게 진행되고 있다. PMLSM은 파라메터의 변동과 외부의 외란에 매우 민감하다. 이러한 PMLSM의 구동에 있어서 요구되는 것은 파라미터 변동과 부하 토크 외란에 견실하면서 빠른 응답속도를 가지는 제어기이다. 따라서, 본 논문에서는 PMLSM의 위치제어를 위한 가변구조 벡터제어시스템을 제안하고자 한다. 파라메터 변동과 외부외란의 변화에 강인한 가변구조 기법을 이용한 슬라이딩 모드제어의 타당성을 시뮬레이션을 통하여 검증하고자 한다.

음성 인식 헬스케어 시스템

신진우,조우승,조성빈,김재훈,정지은,사예지,백경동,박동규 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.2

As modern people's interest in health grows, wearable healthcare-related technologies that can collect biometric information and receive health-related services regardless of time and place are developing. This paper proposes the healthcare system based on voice recognition function. Unlike conventional wearable healthcare systems, the proposed system provides real-time telemedicine and diagnosis and the direct connection with doctors is possible through it. And almost all functions of the application in it are operated with voice commands to lower user access barriers. Because it deals with personal information including medical information, encryption algorithms have been applied between all data movements. Finally, the healthcare system proposed in this paper is expected to increase convenience in health care and reduce the medical gap.

라우팅 브로커링에 기초한 분산 데이터베이스 액세스 메커니즘의 설계

신혜균,장지훈,김정선,최중민,우훈식 漢陽大學校 工學技術硏究所 1998 工學技術論文集 Vol.7 No.1

현재의 클라이언트 서버 환경에서는 수많은 이질적인 데이터베이스 서버들이 LAN과 WAN상에 분산되어 있다. 따라서 이들 서버의 위치에 관계없이 일관되고 확장성 있는 액세스 메커니즘을 클라이언트에게 제공하는 것이 필요하다. 본 논문에서는 라우팅 브로커링에 기초하여 분산되고 이질적인 데이터베이스에 대한 일관되고 위치 투명성과 확장성 있는 액세스 매커니즘을 제시한다. 본 고에서 제안한 메커니즘은 클라이언트와 다수의 서버사이의 중간계층으로서 작동되도록 java와 CORBA 그리고 JDBC의 최신 기술을 적용시켜 설계되었다. In current client/server environments, it is not uncommon to have multiple, heterogeneous database servers scattered on LAN or WAN. Therefore, it is desirable to provide clients with uniform and scalable access mechanism to connect to those servers in a location-transparent way. In this paper, we propose a uniform, location-transparent, and scalable access mechanism based on routing brokering scheme to access distributed, heterogeneous databases on LAN. The proposed mechanism is designed to act as a middle tier between clients and multiple servers, and adopts Java, CORBA and JDBC as its state -of-the -art techniques.

정신분열병에 대한 Risperidone의 효과 및 안전성에 관하여

신석철,왕성근,지익성,이선우,이규광,이봉희,이진영,황선희,신용재,배경도,김정란 충남대학교 의과대학 지역사회의학연구소 1997 충남의대잡지 Vol.24 No.1

In order to evaluate the efficacy and safety of risperidone, 10 patients with chronic schizophrenia were examined for 8 weeks in a silgle-open study. After the wash-out period of 1 week, risperidone was administered. Efficacy was evaluated by means of Positive and Negative syndrome Scale for Schizophernia(PANSS) and Clinical Global Impression(CGI). Safety assessment included the Extrapyramidal Symptom Rating Scale(ESRS), vital signs, body weight, ECG, and laboratory tests. The results were as follows 1) On the PANSS total score, there was significant improvement of total score after 1 week (P<.05) of administratiom. 2) On the PANSS positive and negative subscal, there were significant improvement of posotive and negative scores after 2 weeks (P<.05) of administration. 3) On the PANSS general psychopatholgy subscals, there were significant improvement of general psychopathologyscores after 1 week (P<.05) of administratiom. 4) On the CGI, there was significant decreasement of clinical impression of severity of schizophrenia score after 2 week (P<.05) of administration. 5) A statistically significant increase in body weight (P<.05) was observed after 8 weeks of administration. 6) EPS reached the peak at the end of the 1st week of administration of risperidone (11.8± 24.25) but they were easily relieved by addition of benztropine and clonazepam. There was not significant change in laboratory tests, vital sign, ECG after 8 weeks of administration. These results suggest that Risperidone is an effective antipsychotics and clinically safe except for increased body weight in chronic schizophrenia.

교류여자방식 브러시리스 동기전동기의 공간벡터에 의한 토오크제어

우정인,정영일,노태균,조용길,신동률 東亞大學校 附設 情報通信硏究所 1997 情報通信硏究所論文誌 Vol.5 No.1

In the paper, a vector control method for a AC-excited BLSM(Brushless Synchronous Motor) is proposed. The BLSM has a feature that separate exciter is not needed for excitation. The proposed method is described in two parts as follow, one is the design of drive and the other is a modeling for its imlpementation. Rotor flux is estimated using inditect sensing method based on voltage equation in the synchronously rotation reference frame. And rotor position os calculated from rotor angular velocity and stator current. Through computer simulation results of this prorosed system, it is shown that the BLSM drive has a ability of precision torque control from the static and dynamic performances.

GIS를 이용한 소매업종 상권 반경과 중심지 이동분석

신우진,정창무,이상경 한국부동산분석학회 2002 不動産學硏究 Vol.8 No.1

This paper assesses changing patterns of the commercial power of a region and leading sectors of the movement with radial ring-based analyses of 49 categories of retail services in Kangnam-gu, Seoul. The radius of trade market area(R), as the measure of commercial power of a location, is defined as a pre-defined radial distance from the store location. Moving patterns of the regional commercial power is analysed based on the peak of overlapping density of the retail trade area every year. Findings indicate that the centers have been differentiated from each other in the form of an orderly hierarchy of places, with particular retail services developing for lower-ordered places as they reach a threshold, and leading sectors of the movement are usually retail services favored by teenagers.