크레인 거더의 피로균열에 관한 실험적 연구 (2) -피로균열의 보수법-

김진호,임성우,장인화,시가 아츠미,Kim, Jin-Ho,Im, Sung-Woo,Chang, In-Hwa,Shiga, Atsumi 한국강구조학회 1998 韓國鋼構造學會 論文集 Vol.10 No.2

크레인 주행거더에 발생된 피로균열에 대한 보수방법으로 stop-hole(5mm 또는 9mm), stop-hole에 고력볼트 체결, 용접. 첨판과 고력볼트에 의한 4가지 보수방법을 적용하였다. 이중에서 stop-hole로 보수를 한 경우와 용접보수를 한 경우에는 재균열이 발생하였다. 그러나 stop-hole에 고력볼트를 체결한 경우 및 첨판과 고력볼트로 보수한 경우에는 재균열이 발생하지 않았다. 보수전과 보수후 피로강도를 비교해보면 stop-hole 또는 stop-hole과 고력볼트로 보수를 한 경우에는 모두 보수전과 동등한 피로강도를 얻었다. 용접보수를 할 경우에는 정확한 시공이 시행되면 보수전과 동등한 피로강도를 기대할 수 있지만. 시공이 잘못되면 피로강도가 현저하게 저하될 수 있음을 알 수 있었다. 피로균열이 발생된 위치에 첨판과 소요볼트를 시공할 수 있는 조건이라면 첨판과 고력볼트로 보수하는 것이 가장 확실한 보수법임을 알 수 있었다. Four types of repair procedures are applied to the fatigue cracked crane runway gilders, which are stop-holes as crack arrester stop-holes reinforced with high strength bolts, welding repair and reinforcement with high strength bolted splices. The fatgiue cracks are reinitiated at the region where stop-holes and weld repairments are applied, while none of the cracks are observed in the cases of stop-holes reinforcement and reinforcement with high strength bolted splices. When using stop-holes and hole-reinforcement all repaired regions show a same fatigue strength to the one before the repairments. The experiments also reveal that the proper weldment is an essential factor when applying the welding repairement as a properly welding produces the same level of fatigue strength after the repairement. When the situation permits to use reinforcement with high strength boilted splices, the experiments shows the repairment is the best possible method among the procedures available.

피지 군부의 정치개입: 구조와 원인을 중심으로

김진호(Kim, Jin Ho),강병철(Kang, Byeong Cheol),김순임(Kim, Soon Im) 연세대학교 동서문제연구원 2010 동서연구 Vol.22 No.1

20세기 후반부에 전 세계로 밀어 닥친 민주화 물결에 관하여 오도넬과 슈미터(O Donell & Schumitter)가 주창한 행위자 중심의 접근법으로 각국에서 일어나는 민주화의 개별 사례에서 공통적 특성을 탐구하였다. 이러한 연구는 정치적 행위자의 선택을 둘러싼 사회경제적, 그리고 국제적 맥락으로까지 확산되고 있는데, 특히 공식적인 정치적 장에서 주요한 결정을 내리는 개인들의 게임과 선택을 민주화의 독립변수로만 볼 것이 아니라, 권위주의 퇴진의 게임이 진행되었던 당시의 사회경제적 맥락을 고려해야 된다는 주장이 꾸준히 등장하고 있다. 이러한 민주화에 관한 학계의 진전은 지역 정치체계에 대한 연구에 새로운 접근을 가능하게 하고 있다. 세계 여러 곳에서 대단위적으로 신생민주주의 국가들의 출현 하였다. 그러나 피지의 경우는 다른 평화적인 이행의 경우와는 달리 군부권위주의 체제의 등장이 반복되고 있으나 그대립과 갈등의 정도에서 현저한 차이가 나타나고 있다. 현행 헌법폐지 민주화 과정에 대한 선택론은 오도넬과 슈미터가 주장하고 있는데 엘리트 간 협상과 협약에 대하여 강조하고 있다. 피지의 정치 변동을 살펴보면 이러한 현행 헌법폐지 과정이 나타나고 있다. 2009년 4월 조세파 일로일로(Ratu Josefa Iloilo Uluivuda)대통령은 프랭크 바이니마라마(Frank Bainimarama) 의 쿠데타가 불법이라는 고등법원의 판결 때문에 헌법을 철폐하였다. 피지의 군부개입정치의 특이성은 전통적인 정치관습과 인종적 갈등의 맥락에서 원인을 찾을 수 있다. 즉 대부분의 신생민주주의 국가들의 경우에는 기존의 권위주의체제의 경제정책의 실패로 야기된 회생불능의 위기상황에서 민주화로의 전환이 이루어지는 경향을 보이지만 피지의 경우 군부가 정치에 개입하는 경우는 경제적 실패 때문에 발생하는 것은 아니다. 오히려 군부가 정치에 개입 하면서 경제적 업적을 훼손하고 잠식시키고 있다. 본 논문은 피지군부의 정치개입에 적용시킬 수 있는 이론적 배경과 과정을 검토하며 전통적인 정치문 화와 인종적 갈등을 분석하고 국제사회의 대응과 결과를 살펴보겠다. 특히 2006년 12월 5일의 제4차 피지쿠데타를 중점적으로 분석하겠다. 본 논문에 서는 왜 피지가 제3의 물결에서 발견되는 일반적 궤적을 걷지 않고 오히려 상반되는 군부개입의 정치현상이 되풀이 되는지에 대하여 분쟁해결적인 관점 에서 함의를 도출하겠다. Ever since the second half of 20century, on the democratization wave widespread in the world, case study of each country s democratization has been looking into common features actor-oriented approach to be initiated by O Donell & Schumitter. This has been extended social-ecnomic-international contexts. And also, our eyes is reviewing a socio-economic factor with the demise of the authoritarian regime under these circumstances. Such an advanced discussion should be possibly done a new method in the region political system. There have been emerging a new independent countries cross the continent. The military s political intervention in the Third world countries is the similar trends: push factor, pull factor. But Fiji s situation differs from that of the other countries with the peaceful transition to the civilian. There are conspicuous differences among the concurrent coup of the military, even more the deep cleavages in society. O Donell & Schumitter s choice for the abolition of the present constitution is in the compromise and consensus between the elite. Fiji s case reveals the similar phenomenon of breaking out the laws. In the year of 2009, Fijian president Ilo Ilo declared a abrogation of law, after High court s judgement ‘illegally’ Coup done by commodore Bainimarama. The peculiarities of Fiji Military political intervention is attributable to a traditional political customs and the ethnic conflict between Fijians and Fiji-Indiands. Most of countries in the military s political intervention shows the trend of democratic transition resulting from the failure of the economic policy accomplished by the authoritarian government. Fiji military political intervention is not the reason of the economic failure. Rather, the occasional military intervention is harmful to Fijian economic growth. Accordingly, this paper is to analyze a relations, the background, process of military intervention in Fiji.

EEG신호의 시계열분석에 의한 쾌, 불쾌 감성분류에 관한 연구

임성식,김진호,김치용,Im, Seong-Sik,Kim, Jin-Ho,Kim, Chi-Yong 대한인간공학회 1998 大韓人間工學會誌 Vol.17 No.1

The objective of this study is to extract information from electroencephalogram(EEG) signals with which we can discriminate mental states. Seven university students were participated in this study. Ten stimuli based on IAPS (International Affective Picture Systems) Were presented at random according to the experimental schedule. 8-channel ($O_1$, $O_2$, $F_3$, $F_4$, $F_7$, $F_8$, $FP_1$, and $FP_2$)EEG signals were recorded at a sampling rate of 204.8 Hz for visual stimuli and analyzed. After random ten sequential stimuli presentation, the subject subjectively assessed the stimulus by scaling from -5 to 5. If the stimulus was the best and the worst, it was scored 5 and -5, respectively. Only maximum and minimum scored-EEG signals within each subject were selected on the basis of subjectively assessment for analysis. EEG signals were transformed into feature objects based on scalar autoregressive model coefficients. They were classified with Discriminant Analysis for each channel. The features produced results with the best classification accuracy of 85.7 % in $O_1$ and $O_2$ for visual stimuli. This study could be extended to establish an algorithm which quantify and classify emotions evoked by visual stimulus using autoregressive models.

특허분석을 통한 유기농업 기술 동향

홍승길,김진호,김용기,신재훈,윤종철,박동식,Hong, Seung-Gil,Kim, Jin-Ho,im, Yong-Ki,Shin, Jae-Hun,Yun, Jong-Chul,Park, Dong-Shik 한국유기농업학회 2014 韓國有機農業學會誌 Vol.22 No.3

To investigate the technology trends in organic farming using patent analysis, total 1,026 patents in organic farming in Australia, EU, Japan, Korea and USA between 1974 and 2014 were analyzed. The number of the patents applied in organic farming was largest in Korea, followed by Japan and the USA. Since 2000, the patent application in Korea and USA increased drastically, while in Japan the patents in organic farming were applied steadily in the late 1980s. The applied patents in organic farming were mainly dominated in the field of organic production technology (AA) especially in Korea, while those in environmental assessment were merely applied. Most patent appliers were biased to private applier (80%) than national institutes including university. With this study, it is highly recommended that national interests and R&D on the organic farming fields are needed to meet the food safety.

개입모형을 이용한 EEG 신호의 다변량 분석에 관한 연구

임성식,김진호,김치용,황민철,Im, Seong-Sik,Kim, Jin-Ho,Kim, Chi-Yong,Hwang, Min-Cheol 대한인간공학회 1999 大韓人間工學會誌 Vol.18 No.1

The objective of the study is to discriminate EEG(electroencephalogram) due to emotional changes. Emotion was evoked by the series of auditory stimuli which were selected from the natural sounds in the sound effect collection of compact disc. Seventeen university students participated and experienced positive or negative emotions by six auditory stimuli with intermission between stimuli. Temporal EEG ($T_3$, $T_4$, $T_5$, and $T_6$) was recorded at the same time and a subjective test was performed on the eleven point scales after the experiment. The maximum and minimum scores of the EEG among six stimuli EEG were analyzed for discrimination of emotion. The EEG signals were transformed into feature objects based on scalar intervention model coefficients. Auditory stimulus was considered as intervention variable. They were classified by Discriminant Analysis for each channel. The features showed results with the best classification accuracy of 91.2 % in $T_4$ for auditory stimuli. This study could be extended to establish an algorithm which quantifies and classifies emotions evoked by auditory stimulus using time-series models.

크레인 거더의 피로균열에 관한 실험적 연구(I) -피로균열의 발생과 진전-

임성우,김진호,장인화,Im, Sung Woo,Kim, Jin Ho,Chang, In Hwa,Shinga, Atsumi 한국강구조학회 1997 韓國鋼構造學會 論文集 Vol.9 No.2

크레인 주행거더에서 빈번히 발생되는3 종류의 균열을 재현하기 위해서 거더 길이 640 mm, 높이 600 mm, 폭 300 mm의 시험체 2기를 제작하여 피로실험을 수행하였다. 시험체의 균열은 재하점 부근과 가세트 단부 및 하부플랜지와 웨브의 모살용접부에서 발생하였다. 재하점 근방의 균열은 수직보강재가 위치한 상부플랜지와 웨브 사이의 모살용접부에서 발생해서 웨브의 대각선 방향으로 진전하였다. 또한 하부플랜지 종비드에서 발생된 균열은 주행거더방향에 수직으로 성장하였다. 크레인 주행거더의 각 부위의 피로등급은 JSSC 피로설계지침의 피로등급과 비교해 보면, 재하점 근방의 모살용접부는 E 등급, 가세트 단부는 G 또는 H 등급, 하부플랜지 종비드 부위는 D 등급 정도로 나타났다. 가세트 단부와 종비드 부위는 피로설계지침과 잘 일치하고 있음을 알 수 있다. Three types of fatigue cracks frequently observed in the crane runway girders are verified experimentally using two testing-purpose girders with the size of $6400{\times}600{\times}300$ in millimeters. The fatigue cracks are observed in the vicinity of load-bearing points, at the end of gusset plates and at the fillet welded joints between the lower flange and the web. The load-bearing-point cracks are initiated at the intersection of the fillet welds between the upper flange and the web, where the vertical stiffener is located. The cracks grow up toward the diagonal direction of the web. The cracks observed at the fillet welded joints grow up perpendicularly to the crane runway girder. Compared with the JSSC fatigue design code, the joint class is classified as follows: E for the vicinity of load-bearing points, G or H for the end of gusset plates and D for the lower fillet welded joints. The tests reveal that the class of joint classification at the end of gusset plates and at the lower flange coincides with the fatigue design code.

치과 임플란트 수술용 고출력 초음파 수술기 설계 및 제작

김나리,전대우,김진호,김선욱,황종희,이정배,최성재,임대진,이영진,Kim, Na Ri,Jeon, Dae Woo,Kim, Jin Ho,Kim, Sun Woog,Hwang, Jong Hee,Lee, Jeong Bae,Choi, Sung Jae,Im, Dae Jin,Lee, Young Jin 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.10

This paper presents the design and fabrication of a high power piezoelectric ultrasonic surgery unit for multi-purpose dental implantation. A conventional piezoelectric ultrasonic surgery units consists of a transducer and a tip. However, the drawback of this simple structure is that the output performance of the transducer considerably changes with the change of the tips. An ultrasonic surgery unit that has an additional booster between the transducer and the tip can solve this problem to some extent; for this, an optimal structural design for the transducer is required. We used the Bolted Langevin Transducer (BLT) as the basic transducer; it consists of piezoelectric ceramics and a metal body. It's structure was optimized using mathematical methods to determine the length and radius of the tail and head masses. Additionally, the booster was also subjected to the same methods. Using these mathematical methods, optimal results in terms of the resonance frequency (24.96 kHz), displacement ($14.27{\mu}m$), and pressure (2.8 MPa), could be obtained. The validity of this proposed surgery unit was confirmed experimentally, exhibiting a cutting force of around 7% higher than that of a conventional surgery unit.

외부응력에 의한 PZT압전세라믹스의 열화현상

임진호,이준형,김진호,조상희,Im, Jin-Ho,Lee, Jun-Hyeong,Kim, Jin-Ho,Jo, Sang-Hui 한국재료학회 1994 한국재료학회지 Vol.4 No.4

분극처리된 PZT세라믹스에 외부응력을 인가하였을때 인가되는 응력의 방향에 따른 열화기구의 차이를 조사하였다. 그 결과 분극축과 수직으로 응력을 인가할때의 열화현상은 공간전하분극의 확산으로, 분극축과 평행하게 응력을 인가할때는 분역재배열현상으로 설명하였다. 소결체의 입자 크기가 커지면 열화폭이 커짐을 알 수 있었는데 이것은 입자크기에 따른 내부응력의 차이로 해석하였다. The influence of the direction of applied compressive stress on degradation mechanism ofpoled PZT sample was studied. When compressive stress perpendicular to poling direction was appliedon poled PZT sample, the degradation phenomena was explained by the diffusion of space chargepolarization. On the contrary, compressive stress parallel to poling direction was applied, it wasexplained by the rearrangement of 90" domains. As the grain size increased, the degradation phenomenawas promoted. It is attributed to different internal stress due to difference of grain size. of grain size.

폐플라스틱 기반 열분해유의 고품위화 기술 개발

김현지(Hyun-Ji Kim),김진호(Jin-Ho Kim),장정희(Jung-Hee Jang),김효식(Hyo-Sik K im),강석환(Suk-Hwan Kang) 한국에너지기후변화학회 2023 한국에너지기후변화학회 학술대회 Vol.2023 No.5

한국 성인 발 형태의 좌우 및 변형 연구

임현균,박수찬,최경주,김진호,박세진,Im, Hyeon-Gyun,Park, Su-Chan,Choe, Gyeong-Ju,Kim, Jin-Ho,Park, Se-Jin 대한인간공학회 2001 大韓人間工學會誌 Vol.20 No.1

An analysis of anthropometric data of feet of Korean adults was made in this study. Anthropometric data were measured with the direct measurement method and indirect measurement method. Martin scales and a tapeline were used for direct measurement. Digital images taken with a digital camera as an indirect measurement method were analyzed using AutoCAD program. Total 114 adults aged from 20's to 40's participated in this study. Especially right and left feet were measured. Right and left side were compared and differences according to age were compared too. Feet shape, arch height, and deformation of toe were analyzed. The comparison between right and left foot showed that many subjects had different anthropometric data in their feet. Feet deformation including arch height and claw toe shape showed very serious status. Close and continuous attention to feet deformation is strongly needed.