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박창호 ( Park¸ Chang-ho ),신재인 ( Shin¸ Jae-in ),임홍범 ( Lim¸ Hong-beom ),선병일 ( Sun¸ Byung-il ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
Generally, maintenance programs of highway bridges require a professionally managed, highly skilled, well-trained work force to execute effective maintenance activities efficiently. Highway bridges are significantly increased last decades, and gradually deteriorated. Previous bridge maintenance method of corrective maintenance will require many maintenance engineers and unacceptable funds in the near future. Maintenance engineers are finding out various methods for effective maintenance. Preventive maintenance is realistic alternative, which is used to arrest minor deterioration, retard progressive failure, and reduce the need for corrective maintenance. Therefore, under limited organization and funds, the cost-effective maintenance for enormous numbers of high bridges can be achieved by conducting preventive maintenance and corrective maintenance simultaneously.
이창호 ( Lee¸ Chang-ho ) 한국기독교사회윤리학회 2021 기독교사회윤리 Vol.49 No.-
생명세계의 온전한 질서가 보존되지 못하고 오히려 다양한 형태의 붕괴의 증후들을 선명하게 목격하고 있는 엄연한 생태적 위기의 현실 앞에서, 기독교회와 신자들은 이러한 위기에 대해 응답해야 하는 책무를 가진다는 것은 윤리적으로 볼 때 정언적 명령이라고 해도 지나친 말이 아닐 것이다. 더욱이 하나님이 지으신 세계와 그 세계 안에 있는 모든 존재들의 가치와 위치를 존중하고 그러한 존중을 이타적 행위를 통해 구체적으로 구현하는 것은 자명한 신앙적 신학적 진실이라고 할 수 있다. 이같은 신학적 윤리적 진실과 당위적 명령을 마땅히 받아들여야 할 바로서 인식하면서, 생태적 사랑의 모색이라는 과제를 수행함으로써 생태적 위기에 응답하고자 한다. 생태적 사랑의 신학적 정당화의 논지를 아웃카(Gene Outka)와 몰트만(Jürgen Moltmann)을 중심으로 전개할 것이며, 아웃카와 내쉬(James A. Nash)의 생태적 사랑론을 모색하고 또 이 둘 사이의 비평적 대화를 통해 생태적 사랑 논의의 지평을 확장하고자 한다. Facing the reality of a serious ecological crisis, where the complete order of the life world is not preserved but rather the symptoms of various forms of collapse are clearly witnessed, it would not be too much to say that Christian churches and believers have the responsibility to respond to these crises. Moreover, it can be said that it is a self-evident theological truth to respect the value and position of God’s created world and all beings in the world and to implement concretely such respect through altruistic acts for all the beings of the world. Honoring these theological ethical truths and justifications, I will respond to the ecological crisis by carrying out the task of seeking ecological love. My task here is two-fold. I will justify ecological love theologically, focusing on Gene Outka and Jürgen Moltman. Also, I will attempt to explore Outka’s and James A. Nash’s theories of ecological love and expand the horizon of ecological love through critical dialogue between the two.
A 16-channel Neural Stimulator IC with DAC Sharing Scheme for Artificial Retinal Prostheses
Changho Seok,Hyunho Kim,Seunghyun Im,Haryong Song,Kyomook Lim,Yong-Sook Goo,Kyo-in Koo,Dong-il Cho,Hyoungho Ko 대한전자공학회 2014 Journal of semiconductor technology and science Vol.14 No.5
The neural stimulators have been employed to the visual prostheses system based on the functional electrical stimulation (FES). Due to the size limitation of the implantable device, the smaller area of the unit current driver pixel is highly desired for higher resolution current stimulation system. This paper presents a 16-channel compact current-mode neural stimulator IC with digital to analog converter (DAC) sharing scheme for artificial retinal prostheses. The individual pixel circuits in the stimulator IC share a single 6 bit DAC using the sample-and-hold scheme. The DAC sharing scheme enables the simultaneous stimulation on multiple active pixels with a single DAC while maintaining small size and low power. The layout size of the stimulator circuit with the DAC sharing scheme is reduced to be 51.98 %, compared to the conventional scheme. The stimulator IC is designed using standard 0.18 μm 1P6M process. The chip size except the I/O cells is 437 μm × 501 μm.
Sterovision-based Guidance Line Detection Method on a Field With Ridge-furrow for Autonomous Tractor
( Changho Yun ),( Hak-jin Kim ),( Chan-woo Jeon ),( Jung-hun Kim ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Furrow irrigation, which is conducted by creating parallel channels along the field length, is a cultivation method widely used for growing many row crops such as hot pepper, garlic, soybean and tree crops. These artificially structured parallel channels, commonly referred to as ridge-furrow, can provide guidance to autonomous tractors with its characteristic of undulating surface. This study reports the development of a stereovision-based guidance line detection system (SGLDS) applicable to ridge-furrow cropping fields. The algorithm implemented in the detection system consisted of two different phases, i.e., splitting depth images into two parts (ridge and furrow) and extracting a guidance line from the split images. Through the image binarization method based on distance transform and image segmentation, the depth image was divided into two regions of ridge and furrow and the boundary points of each region were then detected. The second phase extracted a guidance line from the detected boundary points based on linear regression. The guidance line detected by the developed algorithm was compared to manually labelled guidance line, and the result was RMSs of 0.02 m and 0.63 deg in lateral deviation and heading angle, respectively. Further, the stereo camera was installed on a tractor and field tests were proceeded on a straight and regularly spaced ridge and furrow field. As a result, the RMS of lateral deviation measured by a RTK-GPS was 1.37 cm at 3km/s.
Comparison of outcomes in laparoscopic, robotic single and multi site surgery in endometrial cancer
( Changho Song ),( Seungmee Lee ),( Hyewon Chung ),( Tae-kyu Jang ),( So-jin Shin ),( Sang-hoon Kwon ),( Chi-heum Cho ) 대한산부인과학회 2020 대한산부인과학회 학술대회 Vol.106 No.-
Objective: The aim of this study was to compare surgical and oncologic outcomes of conventional laparoscopic operation (CL), robotic multi-site operation (RM) and robotic single-site operation (RS) for early endometrial cancer treatment. Methods: 93 patients who are diagnosed early endometrial cancer and underwent treatment CL (n=31), RM (n=31) and RS (n=31). Results: There was no significant difference in patients demographics among the groups. The surgical outcomes including the actual operation time was the shortest in RS group. (87.3±25.8 in CL vs. 81.1±26.1 in RM vs. 67.0±13.4 in RS P value 0.002) The amount of estimated blood loss did not show statistical difference. Post operation days until discharge was longest in the group who underwent robotic multi-site operation, (5.1±2.3 in CL vs. 10.3±8.9 vs. 3.6±1.8 p value < 0.0005) while CL and RS group did not show statistical significance. Post operational drainage insertion was performed the fewest in robotic single-site operation (Overall P value < 0.0005). Both minor and major post-operative complications in RM group happened the most compared to other two groups (3.2% in CL vs. 38.7% in RM vs. 9.7% in RS p value < 0.0005). The oncologic outcomes including type and rate of adjuvant treatment and the rate of recurrence did not show statistical difference among the groups. Conclusion: RS suggests comparable surgical outcomes to CL and RM without compromising any oncologic outcomes for early endometrial cancer treatment.