실업계 고등학교 전자회로 실습 과제 개발

장기훈 ( Jang Ki Hoon ),임동균 ( Lim Dong Gyun ),신승중 ( Shin Seung Jung ) 한국정보처리학회 2010 한국정보처리학회 학술대회논문집 Vol.17 No.1

This paper is about a development of effective practice subject in electronic circuit textbook of industrial high school. This paper introduces generally about the practice subject in electronic circuit textbook of industrial high school of the 7th National curriculum and presents problem of current practice and makes an alternative idea that improve current practice. The contents of current electronic circuit textbook of industrial high school have variety topics and these topics are independence and separated. So students have some problems to apply of learned knowledge. Therefore, researcher improved the various electronic circuit practice in current electronic circuit text book and added new practice and manufactured a electronic circuit module based on these circuits. And researcher suggested new practice subject what useful electronic equipment that assembled module of result of electronic circuit practice of each section. When the last subjects are accomplished the students may have feel of achievement and high study effect from these practice. The practice subjects of this paper were manufactured after verification and tested it's performance by computer simulation program I hope that these new practice subjects make effective understanding and application of electronic circuit for student.

일차성 하지 정맥류에서 정맥내 레이저 치료술의 임상적 고찰

장기훈(Ki Hun Jang),장정환(Jeong Hwan Chang),김성환(Seong Hwan Kim) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.72 No.5

Purpose: Endovenous laser treatment for incompetent great saphenous vein (GSV) has been recently proposed as an effective means of treatment. The aim of this study is to identify the complications and safety of EVLT as the main treatment for primary varicose vein incompetence when used concomitantly with miniphlebectomy and sclerotherapy. Methods: We reviewed the records of 153 patients who underwent EVLT. Venous duplex scanning was performed 3 months after surgery in all the patients. The clinical outcomes were evaluated using questionnaires at the outpatient clinic or through phone calls. Results: Considering the 97% satisfaction rate of EVLT, EVLT was an effective treatment for primary varicose vein. We observed complications such as paresthesia (20.9%), pain lasting more than 2 weeks (11.8%), ecchymosis or bruising (7.2%) that subsided spontaneously, superficial burn (5.2%) and phlebitis (2%) that was controlled by conservative treatment. The GSV recanalization rate 3 months after the procedure was 3.3%, resulting in a 96.7% success rate. Conclusion: The early results indicate that EVLT is an effective and safe procedure to eliminate the SFJ (saphenofemoral junction) and obliteration of the GSV. However, long-term follow-up is necessary in our study. Better treatment outcomes are possible with accumulated experience and the establishment of strict indications for EVLT.

뉴로-퍼지를 이용한 로봇 매니퓰레이터의 접촉 힘 제어

장기훈(Kee-Hun Jang),양태규(Tae-Kyu Yang) 제어로봇시스템학회 1999 제어로봇시스템학회 국내학술대회 논문집 Vol.2 No.10

회전교차로 형태별 운영 및 안전성 평가에 관한 연구

장기훈(Jang, Ki-Hun),이상수(Lee, Sang Soo) 한국도로학회 2015 한국도로학회논문집 Vol.17 No.5

PURPOSES: The aim of this study is to analyze and compare the operational effectiveness and safety of three different types of roundabout found in the literatures using a VISSIM and SSAM program. METHODS : The three types roundabout tested are the 2-lane roundabout (2R), the Turbo roundabout (TR), and the Flower roundabout (FR). For each scenario, three roundabout types and traffic conditions such as traffic volume and movement ratio were applied to VISSIM in order to compute the average delays. In addition the total conflict was calculated through SSAM by using trajectory data from VISSIM. RESULTS: From the analysis results, the average delay in TR and FR type was higher than the 2R. Regardless of the roundabout types, the average delay was reduced as the right-turn vehicles increased. The total conflict in TR was fewer than 2R for all traffic conditions. CONCLUSIONS : The results of this study can be used in the planning and design process of roundabout deployment. The data also provides some numerical justifications in transition from at-grade intersection to roundabout.

시각장애인을 위한 네비게이션 시스템 설계 및 구현

장수민(Sumin Jang),황동교(Dong-gyo Hwang),강수(Soo Kang),김은주(Eunju Kim),박준호(Junho Park),장기훈(Kihun Jang),유재수(Jaesoo Yoo) 한국콘텐츠학회 2012 한국콘텐츠학회논문지 Vol.12 No.1

본 논문은 시각장애인들의 활동 범위를 확대하기 위해서 주변 시설물 검색서비스와 길안내 서비스를 제공하는 시각장애인을 위한 네비게이션 시스템을 설계하고 구현한다. 제안하는 네비게이션 시스템은 시각장애인을 위한 경로 생성 모듈 및 저장 모듈로 구성된다. 특히, 제안하는 네비게이션 시스템은 시각 장애인을 위한 인터페이스로 TTS(Text-to-Speech) 프로그램을 이용하여 음성을 통한 안내서비스를 위한 음성 모듈과 촉각을 이용하여 점자를 출력하는 점자모듈을 통하여 구현한다. 또한 최신 지도정보를 서비스하기 위해서 구글 맵 API들을 사용한다. In order to extend the activity range of visually impaired persons, we design and implement a navigation system that supports road information services and points of interest. The proposed navigation system consists of route creation modules and storage modules for visually impaired persons. In particular, the main interface of the navigation system are implemented using TTS(Text-to-Speech) program for sound and braille module that outputs braille with sense of touch. We also use google map APIs that can provide latest map information for the navigation system.

전기방사 기술을 이용한 리튬 이온배터리 양극용 리튬-니켈-코발트 산화물 나노 구조체 제조 및 전기화학적 특성

서영민,장기훈,안희준,Seo, Yeongmin,Jang, Kihun,Ahn, Heejoon 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.6

Lithium-ion batteries are products of next-generation energy storage technology that find various applications, e.g., in compact electronic devices and power sources of smart grids, because of their high energy density, low self-discharge, and long life cycles. To be utilized as a power source for a smart grid, lithium-ion batteries require not only a high energy density, but also a high power density. Power density is related to the amount of lithium-ion movement per hour and the surface area of battery electrodes. In this study, an electrospinning technique was used to fabricate a lithium-nickel-cobalt oxide nano-web (LNCOw) with a high specific surface area. The morphology of the LNCOw was investigated by field-emission scanning electron microscopy (FE-SEM), which showed that the LNCOw had an average fiber diameter of 350 nm. Thermogravimetric analysis was performed to determine the optimal temperature for LNCOw synthesis. Furthermore, X-ray diffraction analysis confirmed that the nano-webs consisted of $LiNi_{0.7}Co_{0.3}O_2$. Finally, the specific capacity of LNCOw electrodes was found to be 133.4 mAh/g at 0.2 C-rate, as measured using chronopotentiometry.

발효토에의한음식물쓰레기 소멸화 가능성의 검토

배재근(Chae-gun Phae),주흥수(Hung-soo Joo),박정수(Jung-soo Park),최헌수(Heon-su Choi),장기훈(Ki-hun Jang) 유기성자원학회 2000 유기물자원화 Vol.8 No.4

본 연구는 일반 단독주택 등의 가정에서 쉽게 사용할 수 있는 최상의 발효토를 도출하고자 직접 음식물쓰레 기 소멸실힘을 행하였다. 실험 결과 반응기 내 미생물의 활성에 의해 음식물쓰레기를 투입한 직후의 초기에 비해 다 음 음식물쓰레기 투입직전인 9 일 후의 온도,무게,함수율, vs의 값이 감소하였고,모든 반응기에서 소멸화는 진 행되었다 그 중에서도 S대 미생물제재를 발효토로 사용한 반응기인 F, 4 번 반응기가 가장 좋은 결과를 보였으며, 음식물의 투입주기를 단축하는 것이 가능하였다. 반응이 양호하지 않은 반응기는 시간이 지날수록 그 무게와 수분이 증가하여 장기간 반응 시 악영향을 미칠 것으로 판단된다 염분은 시간이 지날수록 소멸되지 않고 축적되었다. 성능이 우수했던 S 대 발효토를 이용한 적용가온도에 크게 영향을 받았다. 그러나 반응기간은 S대 미생물을 고정한 발효토를 이용한 반응기를 200 C에서 유지하였을 때 3 일 정도로 처리기간을 단축 시킬수 있었다. This study was performed to determine the best fiεrmentation soil in vanishing composting of individual residence garbage. At the result, temperature, weight, warer content, volatile solid were reduced gradually by reaction of microorganism in the reactors after food was inserted for 9 days. The vanishing possibiliry was observed in all reactors. The best reactor was F and 4 mat seeded microorganisms which were provided at S Universiry. In addition it was possible to shorten cycle of putting in food waste. Inactivated reactors were be bad because of increased water content for long reaction time. Sodium chloride was accumulated and not vanished as time passed. But reactor was not insulated, the activities of microorganism in the reactor were affected highly by cold weamer(about less than 12 C). When rhe srudy was exrended ro fllld our rhe feasibiliry of applicarion, rhe rerention time could be shortened ro 3 days form 9 days, when rhe microorganism reactor rhar used the fermentarion soil seeded microorganisms which were provided at S Universiry was maintained about 20 oC.

갑상선에 전이된 유방암 1예

장기훈,김준성,조현진,김권천 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.1

The thyroid gland has been considered as an infrequent metastasis site. However, the incidence of thyroid involvement in reported autopsy series varies from 1.25% to 24%. In most autopsy series, breast and lung cancers have been the most frequent metastatic diseases to the thyroid gland, In contrast, renal cell carcinoma is the most frequent source of metastasis in clinical series. Many reports suggested that ultrasonography and subsequent ultrasonography-guided FNAB are mostly best suited for diagnosis of thyroid metastasis. Metastasis to the thyroid gland is associated with a poor prognosis and the prognosis depends essentially on the primary cancer. Surgery may prolong survival in a patient in whom the thyroid metastasis isolated, and thus early diagnosis and aggressive treatment should be performed in patients with the history of cancer.

퍼지신경회로망을 이용한 로봇 매니퓰레이터의 힘 제어

양태규,장기훈 목원대학교 자연과학연구소 2000 自然科學 硏究論文集 Vol.9 No.1

본 논문에서는 퍼지신경회로망 제어기를 이용하여 미지의 환경에서 로봇 매니퓰레이터의 접촉 힘 제어기를 제안하였다. 환경에 접촉 또는 힘을 가하고 있는 로봇 매니퓰레이터는 인간의 생각하는 방식과 유사한 제어를 위해 퍼지 제어기를 사용하고, 그 때 원하는 접촉 힘을 얻기 위하여 소속함수와 규칙들을 적용하고 신경회로망으로 모델링 하였다. 이는 환경과 접촉하고 있는 로봇 매니퓰레이터의 불확실성과 비선형성을 극복하기 위한 것으로써, 제어기의 입력 신호로 로봇 매니퓰레이터의 위치와 힘 오차를 사용하였다. 시뮬레이션을 통하여 제안된 퍼지신경회로망 제어기의 타당성을 입증하였다.

BSA, Glucose및 Phosphate가 1세포기 생쥐수정란의 체외배양시 2-cell block과 배 발달에 미치는 영향

이정재,이용호,김탁,김선행,안일중,장기훈 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.12

목적 : 여러 종의 포유류에서 수정란의 체외 배양시 특정 단계에서 발생 정지 (in vitro culture block)현상이 보고되면서, 이러한 현상에 관한 연구는 배양액의 기본 성분인 glucose 및 phosphate, 그리고 BSA의 농도가 배 및 배반포 발달에 영향이 있을 것으로 제기되었으며, 이를 알아보고자 실험을 계획하였다. 연구방법 : 기본 배양액으로 M16을 사용하여, 2-세포기 발달 정지 현상이 나타나는 ICR생쥐 1-세포기 수정난을 채취하여 배양하였다. 수정란의 체외배양은 첫 48시간 동안 다른 농도의 BSA (0-15%)하에서 이루어졌고, 48시간 이후 72시간 동안의 배양은 첫 48시간의 BSA 농도와 같은 농도를 사용한 군과 0.3%로 고정된 BSA를 사용한 군으로 나누어 이루어졌으며 각각 2 cell block의 극복율과 배발달율을 확인하였다. 또한 glucose와 phosphate의 효과를 확인하기 위해 배양액에서 첫 48시간 동안은 제거하였으며 48시간 이후 72시간 동안은 제거한 군과 첨가한 군으로 나누어 실험하였다. 결과 : 1. 1-세포기 생쥐 수정란의 배양시 첫 48시간 동안 BSA 농도가 증가할수록 2 cell block의 극복율이 증가함을 알 수 있었지만, 48시간 이후의 배양액에서는 BSA 농도가 증가하여도 배발달율에는 영향을 미치지 못하였다. 2. 초기 배양액에서 glucose 및 phosphate를 각각 혹은 동시에 제거한 경우 BSA의 농도가 높아질수록 2 cell block의 극복율과 배반포율도 증가하지만 후기 배양액(48시간 이후)에서 glucose와 phosphate의 조성의 변화는 배반포율에 영향을 미치지 못하였다. 또한, 배양액의 BSA 농도가 증가할수록 glucose 및 phosphate를 제거한 후 발생하는 2 cell block의 극복율과 배반포율은 증가하였다. 결론 : 이상의 결과는 1세포기 생쥐 수정란의 체외 배양시 발생하는 2세포기 정지현상의 극복하고 지속적인 배발달을 유지하기 위해 BSA의 농도를 증가시키고, 특히 초기배양에서 glucose 및 phosphate를 제거하는 것이 바람직한 배양 방법으로 생각된다. Objective : To assess the effect of BSA, glucose and phosphate addition to a chemically defined medium (M16) on the development of mouse one-cell embryos in vitro. Method : Harvested mouse (ICR) one-cell embryos were cultured for 48 hours using M16 solution with various concentrations (0-15%) of BSA. First, mouse 1-cell embryos were divided into two groups. One group of them was cultured under the same condition for further 72 hours and the other group was cultured in the media with fixed concentration (0.3 %) of BSA, and evaluated the effect of the media on the 2-cell block and further embryonal development. Secondly, the effects of removal of glucose and/or phosphate from the BSA conditioned culture media (M16) on the development of mouse embryo were also evaluated. Results : Higher concentrations (0.9-1.5 %) of BSA in the culture media during the first 48 hours of 1-cell mouse embryo culture overcome 2-cell block significantly, however, the continued exposure to higher concentrations after 48 hours do not influence further development. Removal of glucose and/or phosphate from the culture media during the early stage (first 48 hours) of culture showed significant overcoming of 2-cell block and increased the blastulation rate, but after the first 48 hours of culture, the absence or presence of glucose and/or phosphate do not influence the further embryonal development.Finally, the positive effects of the removal of glucose and/or phosphate are also augmented with the increased BSA concentration of the culture media. Conclusion : Increased BSA concentration and removal of glucose and/or phosphate during the early stage of culture may have favorable effect on 2-cell block and further development of mouse embryo in vitro.