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이병준,윤미정,이경숙,이황재,이완희,Lee, Byung-Joon,Yun, Mi-Jung,Lee, Kyoung-Suk,Lee, Hwang-Jae,Lee, Wan-Hee 대한물리치료학회 2013 대한물리치료학회지 Vol.25 No.2
Purpose: The purpose of this study was to provide information and suggestions for improvement of the intern physical therapist. Methods: I used 'intern physical therapist' as a keyword, and searched using the Google Search Appliance. Hospitals in the Seoul metropolitan region were selected. Twenty six hospitals that operate the intern physical therapist system were selected. A survey was conducted using questionnaires from August 20, 2012 to August 30, 2012. Among the 26 submitted questionnaires, 24 responded, and the results were analyzed using IBM SPSS Statistics 19.0. Results: 1. Education: (1) Sexual harassment prevention training, infection control training was lower at the rehabilitation hospital and semi hospital than at the university hospital and general hospital. (2) The rehabilitation hospital provided more education for intern physical therapists than the university hospital. (3) University hospital practice location was more diverse than that of the rehabilitation hospital. (4) In the rehabilitation hospital, education of practical skill was somewhat higher. 2. The employment rate of people who have completed an internship was higher in the rehabilitation hospital than the university hospital. Conclusion: Trial employment is more reasonable than intern physical therapist at the semi general hospital and rehabilitation hospital. Council is needed for decisions regarding internship training curriculum.
3상 전압인가형 중첩방전 오존발생기의 오존생성 상승효과
이병준,이상근,송현직,김영훈,박원주,이광식,Lee, Byeong-Jun,Lee, Sang-Geun,Song, Hyeon-Jik,Kim, Yeong-Hun,Park, Won-Ju,Lee, Gwang-Sik 대한전기학회 2000 전기학회논문지C Vol.54 No.12
Nowadays, ozone is mainly utilized for water treatment and home equipments. Although the demand for ozone is increasing, the ozone yield of silent discharge type ozonizer is low. Therefore, it is expected to improve the energy efficiency and ozone yield of an ozonizer. In this paper, a new ozone generation system is proposed. The 60[Hz] three-phase voltage is applied to three-phase superposed discharge type ozonizer(3PSDO) which has three electrodes(central, internal and external electrodes). There is no discharge pause time when three-phase voltage is applied due to 120-degree phase difference of applied voltage. The synergy effect of the three-phase superposed discharge type ozonizer is investigated by comparing with the three sort of single-phase discharge type ozonizer(1PDO). So, three-phase superposed discharge type ozonizer is able to obtain high ozone yield, and optimize discharge space, because this can increase the discharge power at low applied voltage.
경사진 QRD를 이용한 전자파 잔향실 내 전자기장 균일도 향상을 위한 연구
이병준,김혜광,이중근,Lee, Byoung-Jun,Kim, Hye-Kwang,Rhee, Joong-Geun 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.6
Schroeder 방식의 QRD(quadratic Residue Diffuser) 구조에서 더욱 진화한 경사진 QRD를 사용하여 전자파 잔향실(reverberation chamber) 내의 전자기장 균일도를 향상시켰다. FDTD(Finite-Difference Time-Domain) 수치 해석방식을 이용하여 $2{\sim}3GHz$ 대역에서의 전자파 잔향실 내의 전자기장의 분포를 해석하였다. QRD 경사 각도의 조절과 경사 방향을 전환하여 전자파 잔향실 내부의 시험 공간에서의 E_x,\;E_y,\;E_z$ 샘플의 표준편차 및 공차가 각각 0.3 dB, 2.5 dB 향상되고 전체적으로 전자기장 분포의 균일성이 확보되었다. The field uniformity inside the reverberation chamber has been improved using sets of quadratic residue diffuser (QRD). The electromagnetic field inside the reverberation chamber with the dimension of $100{\times}80{\times}80cm$ has been analyzed by the finite-difference time-domain(FDTD) method. The calculated fields in a $40{\times}30{\times}30cm$ test volume have been sampled to obtain a standard deviation and field uniformity. Results show that the standard deviation of the calculated field and uniformity have been improved by varying angles and orientation of the inclined surfaces of the QRDs installed inside the reverberation chamber.
알루미늄 AC4CH 합금주물의 냉각속도 변화에 따른 기계적 물성 예측 및 전산모사 적용
이병준,조인성,Lee, Byoung-Jun,Cho, In-Sung 한국주조공학회 2018 한국주조공학회지 Vol.38 No.2
In a numerical study, equations relating the mechanical properties and cooling rate in a casting process have been applied to an AC4CH cast aluminum alloy. Good agreement was found between the measured and predicted material properties. Step-shaped steel blocks were made to comprise a casting mold with a Y-shaped cavity. Thermometers were inserted into each step of the mold to investigate temperature changes. The microstructure and mechanical properties, such as hardness and tensile stress were measured for each cut of piece. The correlation between the cooling rate and SDAS was found by curved fitting. Moreover, both the solidification time and the temperature were simulated using a commercial package, ZCast. The simulation results for yield strength, tensile strength, elongation, and hardness were compared with experimental results. Using the estimated K and n values, the hardness values of a ship propeller were simulated, and the results were similar to those obtained for actual castings.
이병준,길용석,정석호,Lee, Byeong-Jun,Gil, Yong-Seok,Jeong, Seok-Ho 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.2
Laser applied combustion diagnostic techniques-laser induced fluorescence (LIF) and coherent anti-Stokes Ramann spectroscopy (CARS)-are demonstrated. The profiles of hydroxyl radical (OH) and temperature in the counterflow burner are measured and compared with the numerical results. OH radical is excited on the Q$_1$(6) line of the $A^2$$\sum^+$$\leftarrow$$X^2{\prod}$(1, 0) band transition (281.1 nm) and LIF signal is measured at the the bands of (0, 0) and (1, 1) transition (306~326 nm). Absolute OH radical is obtained by using the laser absorption technique. The quenching effects are considered. Temperature is measured using broadband CARS system. Two dimensional OH radical profile is also obtained. The profiles of OH radical and temperature are found to agree well with those of numerical calculation.
덤프형 가스터빈 연소기에서의 화염 불안정성의 사전 감지 인자
이병준,Lee, Byeong-Jun,Santavicca, D.A. 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.5
The effect of equivalence ratio and velocity on the stability of flame in dump combustor was studied in an atmospheric pressure, laboratory scathe dump combustor operating natural gas. Traditionally, peak-to-peak pressure, fluctuation of the heat release rate and Rayleigh index were used to find and control the combustion instability. Cross correlation coefficients, Ci,j which is defined as the normalized value of the integration of the product of two of the mixer pressure, dump plane pressure and heat release rate, are introduced to see whether the flame is stable or not. Ci,j shows more sensitive to combustion status than Rayleigh index in steadily burning flame. Also, the result indicates that the amplitude of Ci,j between heat release and mixer pressure goes up before the flame at the rich de-stabilizing equivalence ratio near $\psi$=0.85. t means Ci:j at this case has a potential to detect the de-stablizing moment in prior to becoming unstable in dump combustor.
산업단지 및 일반생활 지역의 공기 중 톨루엔에 대한 개인노출 및 생체시료의 상관성 분석
이병준(Byoungjun Lee),허 정(Jung Heo),정다영(Dayoung Jung),김순신(Sunshin Kim),류현수(Hyeon-Su Ryu),최민지(Min-Ji Choi),솨이지엔페이(Jian-Fei Shuai),임성국(Sung-Guk Im),양원호(Wonho Yang) 한국환경보건학회 2017 한국환경보건학회지 Vol.43 No.4
Objectives: The purpose of this study was to assess the correlation relationship between personal exposure and urinary hippuric acid in biological monitoring for airborne toluene in an industrial complex and in general environments. Methods: Personal exposure to toluene and its metabolite, hippuric acid, in urine were simultaneously measured in occupational environments area near an industrial complex and in general environments. The study subjects were divided into three types: 137 workers who use organic solvents in the workplace, 210 residents living near a dyeing industrial complex, and 379 residents living in general environments. The toluene exposures of workers and residents were measured by a passive sampler for four days. The urine of participants was sampled when the passive samplers of personal exposure were collected. Results: The toluene and hippuric acid concentrations of workers were the highest, followed by the concentrations of residents living near a dyeing industrial complex and residents living in general environments. The coefficient of correlation between the concentrations of toluene and hippuric acid among workers was 0.749 (p<0.01) in the workplace. On the contrary, correlations between the concentrations of toluene and hippuric acid among residents living near a dyeing industrial complex and residents living in general environments were all not significant. The relationship between the concentrations of hippuric acid and toluene in three types could be described by the exponential growth model. Conclusions: This study analyzed the relationships between toluene exposure and the concentrations of hippuric acid in urine in high, middle, and low exposure environments, and could be described by the exponential growth model.
이병준,전홍석,송호영,Lee, B.J.,Jeon, H.S.,Song, H.Y. 한국전자통신연구원 2012 전자통신동향분석 Vol.27 No.2
정보 중심 네트워킹(Information Centric Networking)은 단대단(end-to-end)으로 통신을 수행하는 기존의 인터넷 통신 패러다임을 정보 중심적으로 재편하려는 시도이다. 이 방법론에 따르면, 통신을 원하는 개체는 통신 대상 호스트(host)의 주소를 명시하는 대신, 통신 대상 정보의 식별자(identifier)를 명시하여 통신을 시작한다. 네트워크는 해당 식별자를 통해 어떤 정보를 서비스하여야 하는지 알아낸 뒤 해당 정보를 전송한다. 정보 중심 네트워킹 패러다임을 지지하는 연구자들은 이러한 통신 메커니즘이 기존의 IP 중심적 네트워킹 구조가 갖는 여러 가지 이슈들에 대한 본질적인 해결책이 될 수 있을 것이라 믿는다. 본고에서는 정보 중심 네트워킹에 관한 연구 동향 및 대표적 연구 프로젝트들을 살펴보고, 앞으로 해결되어야 하는 이슈들을 점검한다.