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남송중기 황간(黃榦)이 한양군(漢陽軍)에서 실시한 진휼(賑恤) -그의 황정(荒政) 기록을 통해서 본 이곳 거주민의 모습-
김영제 ( Kim¸ Youngjae ) 중국사학회 2021 中國史硏究 Vol.- No.131
This article examines the relief works performed by Huang Gan who was a great Daoxue(道學) scholar as well as the local governor of the Hanyang prefecture in the mid-Southern Song period. Through this research, some significant discoveries about the local situations of the backward regions like the Hanyang prefecture and the local relief system during the Southern Song could have been made. Above all, the Hanyang prefecture had different relief system from the other regions then. While the Hanyang prefecture did not have any disaster relief agency like Yicang(義倉), the state-operating granaries like the Changpingcang(常平倉), which had usually played the role of the adjustment of grain prices in the regions, took over the role of the Yichang. When Huang took the post of prefect, a severe drought struck the region. Since it quickly revealed that the drought was beyond the limitations of Changpingcang, Huang established a new relief organization like the Baowu(保伍) system, an organization of mutual assistance by the local people. By allowing the local rich to provide the poor with the relief rice, the Southern Song government rewarded government posts to the rich as compensation instead. Through the Baowu system, in addition, Huang was able to grasp the exact circumstances of the damage with considerable efficiency. Not only as the local prefect but as a Daoxue scholar, on the other hand, Huang eventually succeeded in drought relief through establishing a local autonomous relief system like the Shecang(社倉) by Zhu Xi(朱熹)’s. Above of all, however, the most significant contribution of this research is that it kindly helped us to understand how the local government and local community could have coped with the severe disaster together during the Southern Song period.
Effect of mandibular contouring surgery on the stress distribution during various clenching tasks
Youngjae Yoon,Jae-eun Kim,정준호,Sang-Hwan Oh,Gunwoo Noh,권용대 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.2
A prominent mandibular angle produces a characteristic quadrangle with a coarse appearance. Asians prefer getting the shape of their jaws surgically corrected into a V-line, which is assumed to give a more intelligent, beautiful, and delicate appearance. According to many studies, mandibular contouring surgery may jeopardize mechanical stability. The aim of this study was to analyse the stress on the mandible during function after mandibular contouring surgery using finite element analysis. Based on computed tomography scans, the three-dimensional models of preoperative mandible, mandibular angle ostectomy, and sagittal cortical ostectomy of the mandibular ramus and body with angle ostectomy were obtained. Boundary conditions to restrict movement on both condyles and clenching tasks (incisal clench, right molar clench, and right group clench) were simulated. The sagittal cortical ostectomy model had the highest strain energy (48.51 J) and von Mises stress (77.39 MPa) during the right molar clench task. The maximum von Mises stress on the sagittal cortical ostectomy was increased by up to approximately four times compared with the cases of preoperative mandible. The stress was concentrated at the site of operation, mandibular condyle, and angle. In the case of the sagittal cortical ostectomy model, bone resorption may occur, and there is a possibility of fracture during the right molar clench task. These results suggest that mandibular contouring surgery may be related to the fragility of the mandible, since surgery significantly alters its biomechanics. The degree of surgery may be a determining factor in the stress and fracture risk of the mandible. Therefore, clinicians should establish an accurate and correct treatment plan for the safe prognosis of patients after surgery.
A Study on Measurement System for Performance Evaluation of TTX (Tilting Train eXpress) Network
Youngjae Han,Kihwan Kim,Seogwon Kim,Sangsoo Kim,Young-Mo kim 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Presently, as the feasibility study shows that trans-Korea railway and trans-continental railway are advantageous, interest in high-speed railway system is increasing. Because railway vehicle is environment-friendly and safe compared with airplane and ship, its marketsharing increases gradually. TTX(Tilting Train eXpress) has been developed by KRRI(Korea Railroad Research Institute) for last 5 years to satisfy the need. An electric railway system is composed of high-tech subsystems, among which main electric equipment such as transformer and converter are critical components determining the performance of rolling stock. We developed a measurement system for on-line test and performances evaluation of TTX network line.
A Study on Auxiliary System Characteristics of Railway vehicle
Youngjae Han,Kihwan Kim,Seogwon Kim,Jin-Yong Mok,Jun-Seog Lee,Young-Mo kim 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
The important thing to secure reliability and safety of railway vehicles is to verify performance characteristics of equipments, and related companies or research institutes had made many efforts to verify performances and functions of equipments synthetically and efficiently. Auxiliary system among the on-board equipments is an important part that has influence on safety and performances of vehicles, careful performance test should be done. After part test and complete assembly of auxiliary system, trail test on the test track is conducted now. We has developed a measurement system that can measure vast and various signals effectively. In this paper, we introduce auxiliary system characteristics of railway vehicle. The auxiliary system measurement items are focused on the verification of it’s characteristics.
A STUDY ON A FIRE-ALARM SYSTEM USING ZIGBEE
YoungJae Lee,JinHo Park,ChoongWon Chang,MinSoo Jung 한국멀티미디어학회 2007 한국멀티미디어학회 국제학술대회 Vol.2007 No.-
We designed a ubiquitous fire alarm system integrate with ZigBee of local area wireless communication technology. If we realize the foundation of this technology, in addition to the specialized regions, we can also realize the movable fire alarm system. In some sensitive places such as the movable ignition depository. the sensitive depository of chemical materials and so on. fire cannot be happened absolutely, if we set the movable fire alarm, the maximal effectiveness will be displayed.
Youngjae Jung,Hyungdong Roh,Jeongjin Roh IEEE 2013 IEEE transactions on instrumentation and measureme Vol.62 No.8
<P>This paper describes a high-speed delta-sigma modulator with 65-nm CMOS technology for ultrasound imaging systems. The delta-sigma modulator is based on a 4th-order single-loop switched-capacitor architecture with a 4-bit quantizer. The designed modulator has the advantages associated with input-feedforward architecture, such as the reduced output swing of the integrator, which relaxes the amplifiers' design requirements. Due to the power and area overheads and the timing constraint of the active adder in the conventional multibit input-feedforward modulator, we use an adder-less input-feedforward delta-sigma architecture. As a result, the designed architecture eliminates the extra power consumption and silicon area required by the adder. The designed architecture also relaxes the timing requirement for the quantizer and the dynamic element-matching block compared with the conventional delta-sigma modulator. The modulator achieves a dynamic range of 76dB and a peak signal-to-noise-plus-distortion ratio of 72.3 dB in a signal bandwidth of 6 MHz. The power consumption is 18.5 mW with 1.2-V supply voltage, and the chip core size is 0.25 mm<SUP>2</SUP>. The energy required per conversion step is 0.46 pJ/conv.</P>
Youngjae Lee,Wooshin Choi,Donghoon Lee,장진화,Ji-Houn Kang,Ji-hye Choi,Dongwoo Chang 대한수의학회 2016 Journal of Veterinary Science Vol.17 No.2
Caudal pulmonary artery diameter (CPAD) to body surface area (BSA) ratios were measured in ventrodorsal thoracic radiographs to assess the correlation between CPAD to BSA ratios and systolic pulmonary arterial pressure (PAP) in dogs. Thoracic radiographs of 44 dogs with systolic pulmonary arterial hypertension (PAH) and 55 normal dogs were evaluated. Systolic PAP was estimated by Doppler echocardiography. CPADs were measured at their largest point at the level of tracheal bifurcation on ventrodorsal radiographs. Both right and left CPAD to BSA ratios were significantly higher in the PAH group than in the normal group (p < 0.0001). Linear regression analysis showed positive associations between PAP and right and left CPAD to BSA ratio (right, p = 0.0230; left, p = 0.0012). The receiver operating characteristic curve analysis revealed that the CPAD to BSA ratio had moderate diagnostic accuracy for detecting PAH. The operating point, sensitivity, specificity, and area under the curve were 28.35, 81.40%, 81.82%, and 0.870; respectively, for the right side and 26.92, 80.00%, 66.67%, and 0.822, respectively, for the left. The significant correlation of CPAD to BSA ratio with echocardiography-estimated systolic PAP supports its use in identifying PAH on survey thoracic radiographs in dogs.