타원 패치-슬롯형 UWB 안테나의 해석

장준원(Jang Joon Won),최경(Choi Kyung),황희용(Hwang Hee Yong) 강원대학교 산업기술연구소 2007 産業技術硏究 Vol.27 No.1

In this paper, an modal analysis based on the distribution of the electromagnetic fields on the UWB elliptical patch-slot antenna is presented. We designed the UWB antenna by iterating the dimensional parameters of the antenna as the traditional design method. Then the antenna was carefully analyzed using 3D E-M simulator. The result of the analysis shows that the slot antenna operates on a series of the multi-pole radiations based on TE modes matched to the system impedance. This result gives us an easier method to design the similar antennas, which is the impedance matching to the system impedance after once constructing a proper structure with a series of multi-mode resonances.

창원에서 유행한 백일해의 임상적 특징

장준원 ( Joon Weon Jang ),강진한 ( Jin Han Kang ),최재원 ( Jae Won Choi ),이학성 ( Hak Sung Lee ),마상혁 ( Sang Hyuk Ma ) 대한소아감염학회 2017 Pediatric Infection and Vaccine Vol.24 No.1

목적: 백일해는 백신접종으로 예방이 가능한 질환이지만 세계적으로 증가하고 있고, 국내에서도 환자 가 증가하고 있는 추세이다. 저자들은 최근 창원 지역에서 발생한 백일해 환자의 역학적인 특징과 임상 양상을 알아보고자 이 연구를 실시하였다. 방법: 2015년 7월부터 2016년 3월까지 호흡기 증상을 주소로 창원파티마병원 소아청소년과에 내원하는 환자 중 1주 이상의 기침을 하면서 발작적인 기침, 기침 후 구토, 흡기 시 `흡` 소리(whooping), 야 간 기침이 동반된 환자들을 대상으로 호흡기 검체를 채취하여 백일해에 대한 배양, 중합연쇄반응검사를 실시하였고, 혈액의 항백일해 독소 항체검사(anti-pertussis toxin of ELISA kit, IBL Interna-tional GmbH)를 실시하였다. 기저에 질환이 있거나 최근 1년 안에 DTaP 혹은 Tdap 백신 접종을 한 경우에는 제외하였다. 결과: 연구 기간 동안 대상 환자 50명 중 진단된 환자는 37명이었다. 이 중 중합연쇄반응검사에서 양성 인 환자는 2명이었고 혈청검사에서 양성인 환자는 37명이었다. 환자의 연령은 생후 1개월부터 15세였다. 항생제 사용 후 모든 환자가 합병증 없이 회복되었다. 결론: 2015년 7월부터 2016년 3월까지 창원 지역에 백일해의 유행이 있었으며, 이 연구 결과는 향후 국내에서 발생하는 백일해 역학 연구에 도움이 될 것으로 판단한다. Purpose: Pertussis can be prevented with a vaccine. Despite this, there have been an increasing number of cases worldwide, and also in Korea. This study aimed to investigate the epidemiology and clinical characteristics of the recent outbreak in the Changwon area. Methods: Patients who visited Changwon Fatima Hospital from July 2015 to March 2016 with respiratory symptoms, including spasmodic cough, cough induced vomiting, inspiratory `intake` sound (whooping), and a night-time cough for >1 week were included in this study. Respiratory specimens were collected from patients and a polymerase chain reaction (PCR) and detected anti-pertussis immunoglobulin G enzyme-linked immunosorbent assay kit test were performed. Patients with underlying diseases, or those who had received a DTaP or Tdap vaccination in recent 1 year were excluded. Results: Pertussis was diagnosed in 37 of 50 patients, two patients were positive according to the PCR, and 37 patients were positive according to serologic tests. The age distribution of the patients was 1 month to 15 years. After administering antibiotics, all patients recovered without complications. Conclusions: A pertussis outbreak occurred in Changwon in 2015 and 2016. This data can provide the basis for further study on the epidemiology of pertussis in Korea.

고성과작업시스템과 근로자의 부정적인 감정에 관한 연구: 직무소진과 직무긴장도와의 관계 중심으로

장준원(Joon-Won Jang),윤동열(Dong-Yeol Yoon) 한국인사조직학회 2018 한국인사ㆍ조직학회 발표논문집 Vol.2018 No.2

시시각각 변화하는 시장 환경 속에서 기업은 지속적인 성과를 창출하기 위해 많은 노력을 하 고 있다. 기업 간의 경쟁이 치열해지면서 직원들의 직무에 대한 부담이 증가함에 따라 근로자 의 부정적인 감정을 줄이기 위한 다양한 방법이 연구되고 있다. 그 중 고성과작업시스템 (HPWS : High Performance Work System)은 전략적 인사관리의 방법 중에 하나이다. 본 연구는 근로자가 지각하고 있는 고성과작업시스템과 냉소주의의 관계를 확인하고 둘 사이의 관계에서 직무소진과 직무긴장이 미치는 영향을 밝히고자 한다. 연구대상은 공공기관과 지방공기업의 근로자를 중심으로 하고 공무원과 민간기업의 근로자도 일부 포함하였다. 설문조사는 한국노총 공공노조연맹에 소속된 기관과 일반기업에는 우편을 통한 설문과 온라인 설문을 병행하여 실시하여 58개 기관 428부가 회수되어 불성실 응답을 제외한 356부가 분석에 활용되었다. 연구의 결과 첫째, 지각된 고성과작업시스템과 냉소주의는 부(-)의 영향을 주었다. 둘째, 지각된 고성과 작업시스템과 직무소진은 부(-)의 영향을 주었다. 셋째, 직무소진은 지각된 고성과 작업시스템과 직무소진의 관계를 부분 매개했다. 넷째, 직무긴장은 지각된 고성과 작업시스템과 직무소진의 관계를 조절했다. 다섯째, 지각된 고성과 작업시스템과 냉소주의의 관계에서 직무긴장과 직무소진은 조절된 매개효과가 나타났다. 본 연구를 통해 직무긴장은 지각된 고성과작업시스템이 근로자의 부정적인 감정에 영향을 미치는 중요한 변수임이 확인되었다. 근로자의 직무긴장 상태에 따라 고성과작업시스템이 근로자의 부정적인 심리상태에 영향을 주었다. 그리고 위계적 회기분석을 통한 조절효과와 매개 효과를 개별로 검증하는 것과 SPSS Process를 통해 전체적으로 검증하는 것에 대한 방법론적 인 결과의 차이를 실증사례로 제시하였다. Companies are making a lot of effort to create sustainable performance in the rapidly changing market environment. As competition grows in market, the burden of employees’ get increased, various ways to reduce negative feelings about workers are being studied. Among them, this study focused on a high-performance work system (HPWS), strategic personnel management, worker sentiment. Seeking a reliable settlement from an employee s point of view in the introduction or application of a high-performance work system. Therefore, this study identifies the relationship between HPWS and negative emotion(cynicism). Also this study shows the effect of employee burnout and job strain. The results of this study are summarized as follows. First, the perceived HPWS has a negative effect on the cynicism. Second, the perceived HPWS has a negative effect on the job burnout. Third, HPWS has a negative effect on the cynicism with the mediating effect of job burnout. Fourth, the analysis on the moderating effect of job strain in the relationship between HPWS and job burnout. Fifth, HPWS has a negative effect on the cynicism with the moderating effect of job strain and the mediating effect of job burnout.

소형화된 반원형-슬롯 UWB 안테나의 설계

장준원(Joon Won Jang),최경(Kyoung Choi),황희용(Hee-Yong Hwang) 한국전자파학회 2008 한국전자파학회논문지 Vol.19 No.3

본 논문은 원형 슬롯 UWB 안테나를 소형화한 반원모양의 UWB 안테나를 설계하였다. 전자기장 분석을 통해, 기존의 원형 슬롯 UWB 안테나는 슬롯 방사체에서 TEn 모드에 기초한 일련의 방사 극점(radiation poles)을 가지고 있으며, 완전자계벽의 성질을 갖는 대칭축이 존재한다는 것을 확인하였다. 이를 이용하여 소형화된 반원형 슬롯 UWB 안테나를 설계하고, 광대역 안테나 특성이 유지되는 것을 확인하였다. RF-60A(t=0.64 ㎜, εr=6.15, tanδ=0.0025)의 기판으로 제작하여 측정한 결과, 기존의 원형 슬롯 UWB 안테나의 이득은 -2.7~3.1 dBi이고, 소형화된 안테나는 -2.1~4.3 dBi의 이득을 가지며, 두 안테나 모두 비슷한 방사 패턴을 보였다. This paper proposes a miniaturized half-circular-slot UWB antenna. Using an analysis of the field patterns, we show that the original circular-slot UWB antenna operates on a series of multi-pole radiation based on TEn modes, and a perfect magnetic wall exists along an axis of symmetry on the antenna. Using the perfect magnetic wall we designed and fabricated the miniaturized UWB antenna on RF-60A substrate with t=0.64 ㎜, εr=6.15 and tanδ=0.0025, which not only has the half size of the original but also maintains UWB characteristics. The measured gain of the miniaturized antenna is -2.12~4.3 dBi, which is comparable with the gain, -2.7~3.1 dBi, of the original circular-slot UWB antenna. The radiation pattern is also similar to that of the original antenna.

위치결정 스테이지의 고속 정밀 위치결정을 위한 입력성형명령 생성 기법

장준원(Joon-Won Jang),박상원(Sang-Won park),홍성욱(Seong-Wook Hong) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.10

This paper deals with precise positioning of a high-speed positioning stage without inducing residual vibration by using an input shaping technique. Input shaping is well known to be a very effective tool for suppressing the residual vibration of flexible structures. However, the ordinary input shaping for positioning stages is designated mostly for velocity regulation, not for the residual vibration at the target position. The main difficulties in implementing input shaping along with precise positioning are the time delay caused by the servo system characteristics and the s-curve feature often employed in some motor controllers. This paper analyzes the dynamic responses of a single-made-dominate stage system subjected to input shaping. A theoretical model is developed to investigate the nature of system. In order to overcome the difficulty, this paper proposes an improved input shaper based on modified command profile generation. The proposed method is proved effective through experiments and simulations.

가상모드 입력성형기를 이용한 위치결정 스테이지 잔류진동 저감

서용규,장준원,홍성욱,Seo, Yong-Gyu,Jang, Joon-Won,Hong, Seong-Wook 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.4

This paper presents an experimental result of virtual mode input shaping for positioning stage. Input shaping is liable to increase the rise time of the system, which often degrades the performance of system. The virtual mode input, shaping is an input shaper design method to improve this problem. Experiments are performed with a precise positioning stage with a flexible beam of which natural frequency is adjustable. The experimental results show that the virtual-mode shaper is useful to reduce the rise time as well as the residual vibration of precise positioning stages.

가상모드 입력성형기를 이용한 위치결정 스테이지 잔류진동 저감

서용규(Yong-Gyu Seo),장준원(Joon-Won Jang),홍성욱(Seong-Wook Hong) 한국생산제조학회 2009 한국생산제조학회지 Vol.18 No.3

This paper presents an experimental result of virtual mode input shaping for positioning stage. Input shaping is liable to increase the rise time of the system, which often degrades the performance of system. The virtual mode input shaping is an input shaper design method to improve this problem. Experiments are performed with a precise positioning stage with a flexible beam of which natural frequency is adjustable. The experimental results show that the virtual-mode input shaper is useful to reduce the rise time as well as the residual vibration of precise positioning stages.

공공기관 종사자의 노조수단성과 조직시민행동에 관한 연구: 이중몰입의 매개효과

손종배 ( Jong-bae Son ),윤동열 ( Dong-yeol Yoon ),장준원 ( Joon-won Jang ) 한국생산성학회 2018 生産性論集 Vol.32 No.1

Recently, the government has implemented a new public management policy to improve the performance of the public sector, and the government intends to strengthen the public organization, such as the private sector, by strengthening the competition and focusing on performance. As a result of adopting and applying the personnel management system of the private enterprise to the public institution, the workers of the public institution became more immersed in the labor union to cope with the job insecurity and change. At this time, the employee is simultaneously given the role of the organization member and the role of the union member. It is called dual commitment in which workers are immersed simultaneously in the two organizations, the company and the union, without a conflict of roles. In order to confirm the dual commitment, this study identify the relationships among union instrumentality, organizational commitment, union commitment, and organizational citizenship behavior of public employees which have relatively higher union participation rates than private companies. To test the hypothesis, the questionnaires were distributed to 815 employees of 10 public institution under the Ministry of Employment and Labor, and analyzed 429 participants excluding the unsatisfactory response. The hierarchical regression method was used for this analysis. The results of this study, it was found that organizational commitment has found the mediating effect between union instrumentality and organizational citizenship behavior. And it was found that union commitment is a mediator between union instrumentality and organizational citizenship behavior. Workers have identified dual commitment that both their roles as organizational members and their role as trade union members are at the same time immersed without conflict. This study has empirically tested the effect of union instrumentality on the public institution employees in confirming dual commitment, and provides practical implications. And it is found that organizational commitment and union commitment have an effect on organizational citizenship behaviors. In addition, it discussed limitations and further research directions. As a result of limited research conducted by agencies under the Ministry of Employment and Labor, whole public institution can not be generalized. In the future research, it is necessary to collect data by type of public institution, and comparative analysis with private institutions is also needed.