상관관계기법을 이용한 주파수 변이의 단독운전 검출기법

이종인(Lee Jong-In),유병규(Yu Beyng-Gyu),유권종(Yu Gwen-Jong),김흥근(Kim Heung-Geun) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.11

Grid-connected systems operating in conjunction with a commercial system because the system protection coordination, power quality, harmonic current generation, control and islanding detection of problems and challenges are raised. Islanding detection among other things, as required by the necessity to guarantee the reliability of detection techniques has been steadily on research. In this paper, the phenomenon itself actively driving the change in frequency from the frequency variation technique and the change in cf using the correlation of the frequency change detection method is proposed and a new single operation through simulation verified the validity and effectiveness.

축산환경 : 고도 및 수송거리별 출하 한우의 도체특성 및 표면육색의 변화

이종인 ( Jong In Lee ),이정우 ( Jeong Woo Lee ),박병기 ( Byung Ki Park ),장용설 ( Yong Seol Jang ),최장근 ( Chang Kun Choi ),곽돈규 ( Don Kyu Kwak ),성철완 ( Cheol Wan Sung ),안준상 ( Jun Sang An ),신종서 ( Jong Suh Shin ) 한국동물자원과학회 ( 구 한국축산학회 ) 2012 한국축산학회지 Vol.54 No.1

본 연구는 고도 차이 혹은 수송 거리의 차이가 한우(거세우 및 암소)의 도체특성, 표면육색 및 혈중 cortisol 농도 변화에 미치는 영향을 검토하기 위해 실시되었다. 공시동물은 총 190두로 이중 거세한우는 118두 암소는 72두였다. 자료는 사육 고도(100, 200, 300, 400 및 500m) 혹은 수송 거리(50, 100, 150, 200 및 250 km)에 따라 분석하였다. 사육 고도의 차이가 거세한우 및 암소의 육량 및 육질 형질 변화에 미치는 영향은 적었으며, 수송 거리의 차이가 거세한우 및 암소의 육량 형질에 미치는 영향은 없는 것으로 나타났다. 또한 수송 거리의 차이가 거세한우 및 암소의 근내지방도, 육색 및 지방색에 미치는 영향과 사육 고도 혹은 수송 거리의 차이가 거세한우 및 암소 등심의 명도, 적색도, 황색도, 선명도 및 색상색에 미치는 영향은 낮은 것으로 나타났다. 암소의 경우 사육고도 100m에서 200m에 비해 등심의 명도가 증가되었으며(p<0.05), 거세한우의 경우 수송 거리 250km 그리고 암소의 경우에는 200km에서 등심의 명도가 낮아지는 경향을 보였다. 한편, 혈중 cortisol 농도는 낮은 사육 고도에 비해 높은 사육 고도에서 낮아지는 경향을 보였으나, 통계적인 유의차는 없었다. 수송 거리가 거세한우 및 암소의 cortisol 농도에 미치는 영향은 없었다. 따라서 본 연구의 결과에서 사육 고도 혹은 수송 거리가 한우의 생산성에 미치는 영향은 적은 것으로 판단된다. The purposes of the study were to examine the changes in carcass traits and surface meat color, and cortisol concentration by different altitudes and shipping distances for steer and cow. The experimental animals were shipped from Kangwondo, Kyunggido, Choongchungdo, and Kyungsangdo to Wonju LPC. The animals were examined for yield traits, quality traits, carcass grade, lightness, redness, yellowness, croma value, and cortisol concentration by different altitudes and shipping distances. The results showed that the carcass traits of steer like back fat thickness were not different by shipping distances of 100km, 150km, and 200km. However, the fat thickness was higher in steers shipped from 250km than 100km, 150km, and 200km distance. Rib- eye area was reduced significantly in 200km and 250km than 50km. Yield index and yield grade were significantly low in 250 km than 50-200km. However, meat color, fat color, texture, mature, and quality grade had no differences between shipping distances. Marbling score was not different in 50-200km. However, the marbling score in 250 km was significantly lower than that of 50 km. In case of surface meat color by shipping distance, redness, yellowness, chroma value, and hue-angle were not different in shipping distance of 250km. The lightness had similar result in 50-200 km. However, in case of 250 km the lightness was significantly low. The REA of cow carcass by shipping distance had no differences by shipping distance. The BET had similar results in 50-150km. However, it had significantly thick in 200km. The yield index and yield grade had no differences in 50-150km. However, yield index and grade were significantly low in 200km. The carcass trait of cow had no differences in all items by shipping distance. Although the carcass traits and the BET for steer by altitude had no differences between 100, 200, 300 and 500m, but those were significantly thick in 400m. And the yield index and the yield grade at altitude 400 m were lower than that of other altitudes. The quality traits and the quality grade had no differences between 100, 200, 300, 400, and 500m altitudes. The yield traits, quality traits, yield grade, and quality grade had no significant differences by altitudes. In case of yield index of cow for 300m was low than the cases of 100m and 200m. The surface meat color for steer and cow had no differences by altitudes. However, the lightness of cow had positive result in 100m than 200m and 300m. In case of steer and cow the cortisol concentration by shipping distance was high as the shipping distances were longer. However, the cortisol concentrations of steer and cow by altitudes were decreased as the altitudes were increased. From the above results carcass traits and carcass grade were decreased and the cortisol concentration was increased as the altitudes were decreased for steer and cow.

해안공학분야에서 2차원 수리모형실험을 위한 실험파 설정방법: 불규칙파 대상

이종인(Jong-In Lee),배일로(Il Rho Bae),김영택(Young-Taek Kim) 한국해안해양공학회 2021 한국해안해양공학회 논문집 Vol.33 No.6

해안분야 실험은 복잡하며, 여러 요소들을 고려해야 한다. 성공적인 수행에는 경험이 중요한 요소가 되기도 하며, 조파기 및 계측기의 성능향상 등으로 지속적으로 발달되어 왔다. 수리실험은 구조물의 안정성 및 해안수리학적 특성 검토 분야에서 수치실험에 비해 직관적인 관찰이 가능하다는 장점이 있다. 그러나 모형축척, 실험시설 및 장비와 실험 수행자의 판단 등에 의해 서로 다른 결과가 도출될 수도 있다. 본 연구에서는 수리실험에 있어 가장 기본이면서 중요한 실험파(불규칙파) 설정을 위한 지침을 제안하기 위해 2차원 실험을 수행하였다. 실험을 통하여 주파수 스펙트럼을 활용한 불규칙파의 설정방법 및 입사파고의 범위[(HS)M/(HS)T = 1~1.05]에 대하여 제시하였다. 제안된 실험파 설정 지침은 실험결과의 신뢰도 향상에 기여할 수 있기를 기대한다. The experiments in coastal engineering are very complex and a lot of components should be concerned. The experience has an important role in the successful execution. Hydraulic model experiments have been improved with the development of the wave generator and the advanced measuring apparatus. The hydraulic experiments have the advantage, that is, the stability of coastal structures and the hydraulic characteristics could be observed more intuitively rather than the numerical modelings. However, different experimental results can be drawn depending on the model scale, facilities, apparatus, and experimenters. In this study, two-dimensional hydraulic experiments were performed to suggest the guide of the test wave(random wave) generation, which is the most basic and important factor for the model test. The techniques for generating the random waves with frequency energy spectrum and the range for the incident wave height [(HS)M/(HS)T = 1~1.05] were suggested. The proposed guide for the test wave generation will contribute to enhancing the reliability of the experimental results in coastal engineering.

3㎾ 멀티스트링 태양광 인버터 설계 및 시뮬레이션

이종인(Lee Jong-In),유병규(Yu Beyng-Gyu),유권종(Yu Gwen-Jong),김흥근(Kim Heung-Geun) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.2009 No.11월

The Power Conditioning System is Power Transfer System which make array DC current to the Grid sinusoidal current. These are Low Frequency Transformer Inverter Type, High Frequency Transformer Inverter Type and Transformer-less Type. Low Frequency Transformer Type has a Excellent Isolation property, but doesn't have competitiveness in Size and Cost. Also High Frequency Transformer Type has a good Isolation property but there are many steps in Power transfer Switching. Nowadays, Transformer-less Type inverter change a transformer to DC/DC Converter which is small and cost effective. In this paper shown the DC/DC Converter Transformer-less Type multi-string inverter design and simulation. The Control Algorithm will be introduced and Simulation was accomplished.

충격강도 및 결정화 속도가 개선된 Fused Deposition Modeling 방식 3D 프린터용 Poly-L-lactic acid 기반 필라멘트

이종인(Jong In Lee),오승주(Seung-Ju Oh),정지수(Ji Su Jeong),황영재(Young Jae Hwang),배진우(Jin Woo Bae),남병욱(Byeong Uk Nam) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.7

열가소성 플라스틱의 필라멘트를 사용하는 Fused deposition modeling (FDM) 방식의 3D 프린터는 다른 종류의 3D 프린터에 비해 저렴한 비용과 편의성 때문에 다양한 산업분야에서 사용되고 있다. Poly-L-lactic acid (PLLA)는 생분해성이 있는 친환경 바이오 플라스틱으로 변형이 거의 없으며, 높은 탄성률을 가졌기 때문에 FDM 방식 3D 프린터용 필라멘트로써 많은 관심을 받고 있다. 하지만, PLLA는 FDM 방식 3D 프린터용 필라멘트로 사용되기에는 낮은 충격 강도와 느린 결정화 속도를 보인다. 본 연구에서는, PLLA의 낮은 충격강도와 느린 결정화 속도를 개선하기 위하여 PLLA에 생분해성 플라스틱이면서 충격보강제인 Poly(butylene adipate-co-terephthalate) (PBAT)와 핵제인 Talc를 함께 첨가하여 이축 압출기를 통해 용융 블렌드하였다. PBAT의 첨가는 PLLA의 충격강도를 33 J/m에서 54 J/m 까지 증가시켰다. 반면, PLLA/PBAT 블렌드 조성에서 Talc의 첨가는 PLLA의 충격강도를 46 J/m까지 감소시켰지만, 결정화 온도를 96.1 ℃까지 증가시켰다. 특히, Talc가 3 phr 첨가된 PLLA/PBAT (80/20 wt%) 블렌드 조성은 최적의 충격강도(48 J/m)와 결정화 온도 (94.4 ℃)를 달성하였고, neat PLLA보다 우수한 충격강도 및 빠른 결정화 속도를 보였다. Fused deposition modeling (FDM) type 3D printers, which use thermoplastic filaments, find application in a greater number of industries compared to other types of 3D printers because of their low cost and convenience. Poly-L-lactic acid (PLLA) has received considerable attention as a filament material for the FDM type 3D printer as it is an eco-friendly bioplastic that is biodegradable. Besides, it has lower shrinkage and a high modulus. However, PLLA has a low impact strength and a slow crystallization rate which makes it unsuitable for use as a filament in an FDM type 3D printer. To improve these properties, in this study, PLLA was melt-blended using a twin-screw extruder into poly(butylene adipate-co-terephthalate) (PBAT) and Talc as an impact modifier and nucleating agent, respectively. The addition of PBAT increased the impact strength of the PLLA from 33 J/m to 54 J/m. However, the addition of Talc in the PLLA/PBAT blend decreased the impact strength of the PLLA from 54 J/m to 46 J/m while the crystallization temperature increased to 96.1 ℃. In particular, the Talc addition of 3 phr in the PLLA/PBAT (80/20 wt%) blend achieved optimum impact strength (48 J/m) and crystallization temperature (94.4 ℃), resulting in the superior impact strength and faster crystallization rate compare to neat PLLA.

경종작물분야의 미래유망기술 및 전략기술에 관한 우선순위 재설정 연구

이종인 ( Jong In Lee ),정윤필 ( Yun Pil Jung ),신동철 ( Dong Cheol Shin ),노성훈 ( Sung Hoon Ro ),조근태 ( Keun Tae Cho ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2009 강원 농업생명환경연구 Vol.21 No.-

The study was focused on setting priority for future core technologies in crop production technology using AHP. 46 technologies were derived by specialists meetings. Evaluation criteria for the priority setting were decided as `technology`, `market oriented`, and `public concerns`. 9 specialists in crop production technology answered the questionnaire for AHP. As the results, `market oriented` was decided as the most important evaluation criterion. `Technology realization` in `technology` criterion, `investment profit` in `market oriented` criterion, and `spillover effects on industry` in `public concerns` criterion were decided as sub-criteria in each criterion. The most important technology was Development of technology for High-quality brand rice and standardization of rice traceability.

5, 18 광주민주화운동 관련인물의 미국에 대한 인식: 윤한봉과 윤상원을 중심으로

이종인 ( Jong In Lee ) 전북대학교 사회과학연구소 2012 지역과 세계 Vol.36 No.2

중국군의 베트남 침공(79.2.17)을 시작으로 소련의 아프가니스탄 침공 (79.12.24)으로 마무리 되었던 1979년 세계사의 흐름 속에서, 대한민국은 ``10·26 사건``이라는 중요한 역사적 사건을 맞이하게 된다. 그 후 박정희 정권 시절부터 군대내의 핵심 세력으로 성장한 ``신군부``주도의 ``12·12사태``와 ``5·17쿠데타``를 거쳐서 ``5·18 광주민주화운동``이라는 한국 민주화 운동 사상(史上) 중요한 사건들 중 하나로 평가되는 시기에 이르게 된다. 그리고 1982년 3월 ``부산 미문화원 방화사건``등의 일련의 사건은 80년대 반 미(反美)운동의 도화선이 됨과 동시에 1980년 5월 광주학살에서의 미국의 역할 때문에 한국민의 미국에 대한 인식이 결정적으로 변화하게 된 실체를 보여 준 사건이었다. 이처럼 1980년 5월 광주에서 일어났던 ``역사적 기억``들은 ``신군 부``, ``민중항쟁`` 등으로 기억되는 요소들 이외에 ``미국``이라는 대한민국의 현대 사에서 결코 간과할 수 없는 독립변수를 내포하고 있는 것이다. 그런데 이러한 ``논의의 주체``에 대해 살펴보던 중, 5·18 광주민주화운동과 관련하여 비슷한 것 같으면서도 아주 상반된 삶을 살았던 두 인물에 대한 학문적 호기심(Scholastic Curiosity)을 발견할 수 있었다. ``5·18 최후의 수배자`` 윤한봉(Yoon Han Bong)과``시민군대변인`` 윤상원(Yoon Sang Won)이 바로 그들이다. 이에 본 연구는 5·18 민주화운동과 밀접한 관련을 맺고 있는 이 두 사람이 ``5·18`` 이라는 사건을 통해 느꼈을 법한 지정학적 인식(Geopolitical Perception) 을 바탕으로 미국이라는 존재에 대해 고민해 보는 것을 주 목적으로 한다. 항쟁의 적극적 주체로서 활동했던 윤상원이 그 당시에는 자유민주주의를 외 쳤으나, 자신의 죽음을 통해 진정한 의미를 찾게 되었음과 동시에, 80년5월광 주의 공간에 있지 못한 죄책감으로 힘들어 했던 윤한봉의 사회운동으로 이어졌다는 역설적 상황은 5·18 광주민주화운동 관련인물에 대한 평가의 다양성이라 는 측면에서 접근하고자 했던 필자의 문제제기와 연관성을 가질 수 있다. The year of 1979, the world politics were undergoing upheavals with a series of historic events. The Chinese invasion into Vietnam came on the morning of 17 February 1979 and the Soviet Union attack on Afghanistan took place in the very same year. Korea was no exception. On October 26th, 1979, the President of South Korea, Park Chung Hee and five others including the president`s bodyguard were shot dead by the chief of his intelligence service, Kim Jea Kyu. The Yushin regime was overthrown following President Park`s assassination. After this tragic incident, with rise of the "New Military Regime", a series of historic events such as the 12.12 Military Insurrection, the military coup in 1980 and the May 18 Gwangju Democratic Movement took place in Korea. The Gwangju Democratic Movement, which was first disregarded, is now seen as one of the most important pro-democracy movements. On March, 1982, Korean college students set a fire in the U.S. Culture Center. This served as a catalyst in fueling anti-Americanism among Koreans. It also clearly showed dramatic changes in Koreans` attitude toward the U.S. after America took part in the genocide in Gwangju, a Southern Korean city, in 1980. What happened in the city was not just a reminder of the "New Military Regime" or the uprising against the military government but also the U.S.`s role in the tragic event. While reading books on the subject of the Gwangju democratic movement, I found two different persons who excited my scholastic curiosity. The two, Yoon Han Bong,"the last wanted man involved in the Gwangju democratic movement" and Yoon Sang Won, "a citizen soldier of the movement", led very different lives but shared something in common. The purpose of this paper is to shed new light on the role of the U.S. in the Gwangju democratic movement, based on the two important figures` geopolitical perception in line with the movement. The true meaning of liberal democracy could be found in the death of Yoon Sang Won who dedicated his life to liberal democracy. After all, his strong commitment toward democracy was later carried out by Yoon Han Bong who suffered from the guilt conscience for not participating in the Gwangju democratic movement. The paradoxical link between the two important figures needs to be reexamined in terms of academic diversity.

낙석방지시설 적용을 위한 팽창메탈의 특성 연구

이종인(Lee Jong-In),정춘교(Jung Chun-Gyo),김성호(Kim Sung-Ho),황영철(Hwang Yeong-Cheol),이승호(Lee Seung-Ho) 한국지반환경공학회 2011 한국지반환경공학회논문집 Vol.12 No.9

산지가 많은 우리나라는 도로 및 철도건설을 위해 사면을 형성하는 구간이 많고, 사계절의 뚜렷한 차이로 인해 해빙기에 암블록의 이완현상 발생과 연평균 강우량의 2/3 정도가 여름철에 집중 발생되는 기후특성이 있으며, 최근 기상이변에 따른 집중호우 등으로 낙석 및 산사태와 같은 도로절개면 붕괴사고가 잦은 편이며, 해마다 장마철이 되면 이와 관련된 사고소식을 매스컴을 통해 쉽게 접할 수 있다. 낙석 발생 시 인명과 재산 피해를 최소화하기 위하여 절개지에 대한 보강공법의 개발 및 현장 적용성에 대한 연구 등이 활발히 이루어지고 있지 않는 실정으로 이에 대한 연구의 필요성이 부각되고 있다. 특히 낙석방지망의 부분적 취약점(일체화가 되지 못함)으로 인해 낙석방지망이 충분한 지지능력을 발휘하지 못하는 문제가 발생됨에 따라 국내에서도 보다 높은 낙석에너지를 지지할 수 있는 낙석방지망에 대한 연구가 필요할 것으로 판단된다. 이에 본 연구에서는 낙석방지망의 대체재료로서 팽창메탈의 적용성을 실험적으로 검증하고, 그 특성에 관해 연구해 보고자 하였다. 시험결과 팽창메탈은 우수한 강도와 일체화된 재료특성으로 기존 PVC망에 비해 최대지지하중이 높게 나타났으며, 현장시험의 흡수가능에너지 또한 높게 나타나 낙석방지망의 대체재료로서 활용이 가능한 것으로 판단된다. There are many mountains in Korean Peninsula, and those used for the construction of roads and railways sectors are forming slopes. Slope collapse occurs with falling rocks and landslide because of the relaxation of the thawing rocks. The heavy rain in summer can also significantly contribute to the process, and abnormal climate change is much more influential than before. Therefore, rockfall-related accidents in rainy season are easily accessible in media every year. There has been a lot of research on application of strengthening compensation of the sections in order to minimize casualties and property damage. Rockfall Protection Net, however, has not been focused on much in the field yet. This study highlights the need of Rockfall Protection Net, since it can segregate the falling rocks inside the net relatively safely. Although there has been a little doubt about the effectiveness of rockfall protection facilities, it is obvious that relevant studies dealing with the solidity of the net are necessary for the rockfall protection net to be capable of supporting rockfall energies. As a result, Expanded metal strength is much more durable compared to the PVC coating net, and it is regarded as an excellent alternative material for the Rockfall Protection Net. In this study, the applicability of Expanded Metal as the alternative of Rockfall Protection Net is verified experimentally.

토끼 동종골이식에서 이식골편의 동결법, 동결건조법, 탈지 후 동결법 처리에 따른 신생골 형성능력 비교

이종일,송하나,김남수,최인혁,Lee, Jong-Il,Song, Ha-Na,Kim, Nam-soo,Choi, In-hyuk 대한수의학회 2007 大韓獸醫學會誌 Vol.47 No.2

Bone allograft had been increased the need because autogenous bone graft is associated with donor site morbidity and is restricted in quantity. The bone allograft implants have to prepare properly for increasing osteoinductive ability and decreasing immune responses before providing to graft. The purpose of this study was to investigate the efficacy on new bone formation in bone allografts by treatment of implants. Cortical bone allografts were transplanted to experimental defects on midshaft of diaphyseal fibulae in 15 rabbits, which were divided to 3 experimental groups according to the preparation methods-freezing, freeze-drying, defat-freezing. The grafted regions of fibulae of all groups had been radiographed biweekly for 16 weeks to observe new bone formation and union between implant and recipient bone. Bone Alkaline Phosphatase (BALP) in all groups was evaluated biweekly till the end of the experiment to determine osteoblast activities. Unions between implant and recipient bone were observed at 30% (3 of 10 cases) of freezing, 50% (5 of 10 cases) of freeze-drying and 80% (8 of 10 cases) of defat-freezing. BALP was increased over 100% from before graft at 2 weeks of graft procedures in all union cases of freezing and defat-freezing group, then gradually decreased till 16th week. In non-union cases, there is no significant variation in BALP value. Defat-freezing method for allograft implants might be more effective for osteoinductive efficacy of implants than freezing and freeze-drying method.

자가골 이식에서 이식골편의 처리방법에 따른 골형성능력 비교

이종일,송하나,김남수,최인혁,Lee, Jong-Il,Song, Ha-Na,Kim, Nam-soo,Choi, In-hyuk 대한수의학회 2007 大韓獸醫學會誌 Vol.47 No.1

Bone graft had been investigated previously to restore bone defects in orthopedics. The purpose of this study was to investigate the efficacy on new bone formation in bone autografts by treatment of implants. Cortical bone autografts were transplanted to midshaft of diaphyseal fibulae of 9 rabbits which were divided in 3 groups according to the treatment method of implants. Cortical bone implants for graft were treated with 3 different methods; freezing, freeze-drying, defat-freezing. Autografts were achieved by cross-transplantation method to bilateral fibulae of the presented rabbits after implant treatment procedures. The grafted regions of fibulae of all groups had been radiographed biweekly for 16 weeks to observe new bone formation and union between donor and recipient bone in the grafted region. Bone alkaline phosphatase (BALP) in all groups was evaluated biweekly till the end of the experiment to determine osteoblast activities. Unions of the experimental grafted regions were observed at 83% (5 of 6 cases) of freezing, 17% (1 of 6 cases) of freeze-drying and 67% (4 of 6 cases) of defat-freezing autografts, respectively. BALP was increased over 100% after 2 weeks of graft procedures in all union cases (all cases in freezing group and in defat-freezing group, and 1 of 3 in freeze-drying group, respectively), then gradually decreased from 4 th week of graft to 16 th week. In non-union cases, there is no significant variation in BALP value until the end of experiment. It is speculated that defat-freezing method of treatments of implants is more safe to preserve the osteogenic ability in autograft than freeze-drying method.