직교자계가 디펌성능에 미치는 영향

김기찬,김영학,신광호,김휘석,윤관섭,양창섭,Kim, Ki-Chan,Kim, Young-Hak,Shin, Kwang-Ho,Kim, Hwi-Seok,Yoon, Kwan-Seob,Yang, Chang-Sub 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.3

An orthogonal magnetic field is often used for a military vessel in the deperm process such as Flash D deperm protocol and Anhysteretic deperm protocol. The effect of the orthogonal magnetic field on a deperm performance was investigated for a sample with strain-induced magnetization and field-induced magnetization given to different direction. A 70mm wide, 110mm long and 0.25mm thick rectangular steel plate was bent to have U-shape and to generate a strong strain on the bottom region of U-shaped steel plate. Field-induced magnetization was attached by NdFeB permanent magnet. Demagnetization was performed by applying magnetic field with a step decrement from the first field(the first shot) under the action of DC bias field.

宇宙의 氣로 興하는 高興

이청하 ( Lee Cheong-ha ),김기찬 ( Kim Ki Chan ) 대한풍수연구학회 2024 대한풍수연구 Vol.12 No.0

It is a name that expresses or symbolizes the existence of all things in the world. It is the earth’s name that permeates the breath of our ancestors spatially, mentally, and culturally. The place name has allowed the wisdom and all kinds of sorrows of the local people to be with the history of life. The place name, which was called in pure Korean, was changed when it was written in Chinese characters, praying for the notes and huns of the Chinese characters. One of the place names that has been called since ancient times has coincidentally matched today’s reality is Goheung. Apart from the friendship of geomancy, the researcher studied several friendships in human civilization, names of medicinal plants, and feng shui geographical friendships. The subject of this study is the history of proudly entering advanced countries in the G7 space era, that is, the region where a satellite of more than 1 ton was launched with its own technology from Oenarodo, and the names of Goheung (Heungyang), Bongnaesan, Oenarodo, Singeum, and Yanae were studied. The 蓬萊 Mountain 羅老 is an ideal world, a site of glory, and the overseas 火 island symbolizes seasoned and mature achievements out of space with the 曳 energy, the 收斂 運 symbolizes Kim Ki-woon’s national 向, and the space industry symbolizes the 財 of 錦 with the new 叡智, so it was concluded that the space industry’s economic profit prediction was in line with the current situation, and that it was a friendly place where one could feel the superior 叡智 of one’s ancestors. In other words, Goheung was prosperous with the luck of Yang Gi-woon.

지속가능기업을 향한 이중나선모형기반 진화경로 분석

김기찬(Ki Chan Kim),박지윤(Ji Yun Park),이성상(Sung-sang Lee),Edward Keith G. Capoy,Charles H. Fine 한국경영학회 2012 Korea Business Review Vol.16 No.2

대부분의 기업들이 성장과정에서 정체기를 가지며, 이것이 혁신의 시작이 되면 장수하지만 그렇지 못한 경우는 주저앉고 만다. 기업능력은 더 이상 개발되지 못하는데 유산비용은 점차 커지기 때문이다. 특유한 기업역량은 모방되고, 기존 경쟁이 진부화되면 기업은 쇠퇴한다. 이때 재혁신이 필요하다(Nunes and Breene,2011). 특히 큰 정체기에서 다시 회복하는 기업은 10%정도에 불과하다. ``스톨포인트(Nunes, Paul, and Tim, 2011, Olson, van Bever, and Verry, 2008)의 연구에 의하면 포춘 100대 기업 중 87% 기업이 스톨의 덫에 걸린다. 이 중 11%는 고성장을 다시 회복한 반면 75%는 재도약에 실패하고, 13% 기업만 지속적 성장을 한다고 보고한다. 한국기업들은 선진기업 추적전략을 통해 지금까지 진화해왔다(이근 외, 2008). 본 연구는 구 대우자동차 가 경영위기로부터 GM에 인수된 이후 경쟁력을 회복하는 과정을 동적능력과 조직능력의 관점에서 분석하고 있다. 첫 번째로, MIT의 파인교수(1998, 김기찬, 박성규, 송창석 역, 2002) 모델을 기초로 기업의 성장과정을 추적하고자 하였다. 특히 조직능력(organizational capability)과 동적전환능력(dynamic capability, Eisenhardt and Martin, 2000)의 진화단계별 특성을 살펴보고자 하였다. 그 특성에 따라 부품산업에 있어서 설계능력의 변화(송창석, 김기찬, 강명수, 2003), 기업복잡성 관리를 위해 모듈화(Baldwin and Clark, 1997, 2000, Camuffo, 2000, Fujimoto, 2002a, 2002b)가 도입되는 특성이 있었다. 두 번째로, 이러한 모델을 바탕으로 GM Korea의 진화과정을 추적, 분석하였다. 특히 GM과 대우자동차간 협력전략의 장점을 중심으로 살펴보고자 하였다(Astley and Fombrun, 1983, Lavie, 2006). GMKorea는 GM에 인수된 이래 국내와 해외자동차시장에서 괄목할만한 판매신장을 가져왔으며, GM의 글로벌경차 및 소형승용차 개발센터로 선정되어 핵심 R&D의 역할을 수행해 왔다. 2008년 글로벌 금융위기 이후 GM Korea는 침체기와 회복기를 거쳐 회사명의 변경과 더불어 한국시장에서 브랜드를 변경하였다. 또한 본연구에서는 글로벌 전략을 통해 GM Korea의 성공에 많은 영향을 주고 있는 모회사 GM의 진화과정을 함께 분석하고 있다. GM 진화과정의 한 부분으로 GM Korea의 역할과 진화과정을 Double Helix Model을 통하여 연계분석함으로써 글로벌자동차 메이커와 연계한 한국자동차기업의 지속성장(장수기업) 진화경로 연구에 대한 전략적 시사점을 얻고자 하였다. 다만 본 연구의 사례연구 대상기간인 2002년에서 2009년은 미국 본사의 GM과 한국의 대우자동차가 협력적 전략관계를 통해 부실기업인 대우자동차를 안정화시키기 위해 노력했던 시기이다. 그러나 2009년 이후에는 어려워진 본사 GM의 영향으로 단기적 수익추구전략이 예상된다. 회사명까지 GM Korea로 개정하였다. ``대우``라는 명칭을 지운 GM Korea는 향후 대우자동차의 입장보다는 본사의 단기수익을 강조하게 될것이다. 이 경우 협력적 관계를 전제로 한 지금까지의 사례내용과는 다르게 갈등적 경쟁관계가 예상된다. 또한 한국 내 부품업체들과의 상생적 협력관계기반이 흔들리고, 기업생태계와 관련된 여러 문제(김기찬,2009)가 제기될 것으로 예상된다. Even the most successful firms experience a life cycle effect of rapid growth that eventually gives way to some degree of stagnation. Many firms accept gracefully the natural slowing of their growth rates as they mature, while others try to kickstart a new innovation process as soon as they perceive a slowdown upon them. Many companies fail at such attempts due to inadequate organization capabilities, competition that is too intense, or an inability to overcome legacy practices and/or costs. Some are able to sustain growth rates with new innovation (Nunes and Breene, 2011) but the numbers are small. In particular, only less than 10% of firms can restore. In a study of Fortune 100 companies (Nunes, and Breene, 2011, Olson, van Beber, and Verry, 2008), 87% of the firms saw their growth stall during the period observed. Of these, 11% managed to get back on the high growth track, but 75% failed to break their fall. The remaining 13% managed to maintain a stable, sustainable path. Mostly firms in Korea have evolved so far by tracking and benchmarking the global leading companies (Lee, 2008). This paper analyzes the restoration process of the competitiveness of GM Korea, in terms of its organizational capabilities and dynamic capabilities - from the time it became a subsidiary of General Motors following its crisis as the former Daewoo Motors. This paper traces the growth of a firm applying the Double Helix Model of Fine (Fine, 1998, Kim, Park, and Song, Korean translation, 2002). In particular it examines the characteristics of the organizational capability and the dynamic capability(Eisenhardt and Martin, 2000) by evolution stage. It is notable that these characteristics have been reflected on the change in design capability of Korean parts suppliers (Song, Kim, and, Kang, 2003) and the introduction of modularity(Baldwin and Clark, 1997, 2000, Camuffo, 2000, Fujimoto, 2002a, 2002b) to control the complexity management. This paper, using Double Helix Model, traces and analyzes the evolutionary path of GM Korea. Also this paper looks into the growth track of the company from the standpoint of benefits through the cooperation (Astley and Fombrun, 1983, Lavie, 2006) between GM Korea and its parent company, GM. After the GM`s acquisition, the company reported remarkable sales performance both in the domestic and global market as GM`s home for mini and small vehicles development, followed by a steep downfall after the 2008 Global Financial Crisis. Post-crisis, the management team has rebuilt the company as GM Korea. To fully explore this process, this paper traces the evolutionary path of GM, the mother company, as it played a significant role of leading GM Korea to its recent successes. This paper`s conceptual structure borrows from Fine`s Double Helix Model (Fine, 1998). This study may be used in learning and capturing strategic lessons on the future study on the evolution path of the Korean automobile industry for the sustainability. The analysis of this paper focuses on the time period from 2002 through 2009 when both GM Korea and GM together were in the process of rebuilding GM Korea to stabilize the operation through the strategic collaboration between them. Nevertheless, GM Korea may pursue the short term performance after 2009 reflecting the policy of GM which has been restored by the support of US government, but still encountering difficulty in terms of competition. Renaming of GM Korea partly reflects the strategy of GM. GM Korea may take into consideration the position of GM in the future. If this supposition comes true, the relationship between the two companies may be less cooperative and become competitive. Also this kind of different situation may weaken the win-win relationship between GM Korea and its Korean parts suppliers as well as influence the business ecosystem(Kim, 2009). of the entire automobile industry in Korea.

자동차용 솔레노이드 밸브의 동특성을 위한 연성해석

김기찬(Kim, Ki-Chan) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.6

본 논문에서는 자동차용 솔레노이드 밸브의 전자장 해석 기반의 동특성 해석 모델을 통하여 성능을 향상시키는 방법 을 제안한다. 종래의 솔레노이드 밸브의 요크와 플런저의 형상 최적설계를 통하여 저전류 고추력의 고성능 솔레노이드 모델 을 도출하였다. 동특성 해석을 수행하기 위해 솔레노이드 밸브의 입력 전류 패턴을 분석하고, 이를 통해 밸브의 개폐시 속도, 추력 정보를 해석하였다. 입력 전류 패턴을 출력하는 제어로직의 회로모델과 스프링 및 댐핑 등을 고려할 수 있는 솔레노이 드 밸브의 전자장 해석모델의 연동해석기반을 제안하여 입력전류 패턴의 변화가 밸브 동특성에 주는 영향을 분석할 수 있었 다. 마지막으로 종래모델과 최적모델의 동특성 해석을 통하여 최적설계 모델의 성능이 개선됨을 확인하였다. This paper proposes a methodology for developing the performance of a solenoid valve for vehicles based on the dynamic analysis model by an electromagnetic field. The high performance solenoid model with a low current and high thrust was induced through the shape optimal design of the yoke and plunger. To perform the dynamic analysis of the solenoid valve, the input current profile was analyzed. The speed and thrust information was analyzed by FEM with this current profile. The co-simulation method of the circuit model of control logic and electromagnetic model of the solenoid valve was also proposed to analyze the performance with several current patterns. Finally, the performance of the original model and optimal one was compared.

사람중심 기업가정신모델의 혁신효과: 혁신성장 중소기업 정책에의 시사

김기찬(Ki-Chan Kim) 한국경영학회 2019 경영학연구 Vol.48 No.4

개발효용성에 근거한 기술대체모듈의 선정모형

김기찬(Ki-Chan Kim),안기현(Ki-Hyun Ahn),강일중(Il-Jung Kang),권철신(Cheol Shin Kwon) 한국경영과학회 2007 한국경영과학회 학술대회논문집 Vol.2007 No.11

The object of this research is to evaluate the priority of R&D project alternatives which were already screened by both feasibility and suitability of technological performance. This research is a selection model for R&D project alternatives after setting phase. And it is designed by CHP model which include individual and mutual weights. This model have 5 steps. (1) Setting Technology-Modules derived on the setting phase (2) Presenting the evaluation standards divided with ‘M-Field’ and ‘T-Field’ (3) Assessing the evaluation standard and technology modules (4) Obtaining and integrating the individually and mutually effective weights (5) Selecting the technology modules based on the priority of order by CHP Through these steps, this model can suggest the evaluation way from specific technology levels to project level. And it can be guaranteed to perform the selected module set.

국산 장려콩으로 만든 두유의 Mineral, Oxalate 및 Phytate 함량과 품질특성

김기찬(Ki Chan Kim),황인국(In Guk Hwang),김현영(Hyun Young Kim),송항림(Hang Lin Song),김홍식(Hong Sig Kim),장금일(Keum Il Jang),이준수(Junsoo Lee),정헌상(Heon Sang Jeong) 한국식품영양과학회 2010 한국식품영양과학회지 Vol.39 No.8

국산 콩으로 제조한 두유의 품질특성과 무기성분, oxalate 및 phytate 함량을 분석한 결과는 다음과 같다. 두유의 수율 및 고형분 함량은 각각 8.43(보광콩)~9.15 mL/g(봉의콩과 한남콩) 및 4.37°Brix(안평콩)~7.17°Brix(봉의콩) 범위로 나타났으며, pH와 총산도는 각각 6.43~6.86 및 1.48~1.65% 범위를 나타내었다. 점도는 15.73(다원콩)~20.80 cP(한남콩) 범위를 나타내었다. 색도는 검은색 외피를 갖고 있는 청자콩, 다원콩, 선흑콩 및 검정콩4호로 만든 두유의 L값이 작았고 a값은 크게 나타났다. Calcium 함량은 0.714(금강콩)~1.589 ㎎/g(선흑콩) 범위였으며, oxalate 함량은 0.24(안평콩)~2.14 ㎎/g(한남콩), phytate 함량은 0.63(호장콩)~ 2.18 ㎎/g(안평콩) 범위였다. Calcium/oxalate 함량 분포에서 oxalate 함량이 calcium보다 넓은 분포를 나타내었으며, phytate/ oxalate 간에는 phytate가 넓은 분포를 나타내었다. 콩에서 두유로의 oxalate 전이율은 13.6(안평콩)~77.6%(진품콩2호) 범위였으며, phytate는 13.9~87.5%로 동북태가 가장 높았고 호장콩이 가장 낮았다. 이상의 결과를 종합해보면 국산 장려 콩을 이용하여 두유를 제조할 경우 phytate의 전이율이 높고 oxalate의 전이율이 낮은 봉의, 안평콩 및 보광콩이 좋을 것으로 판단되었다. This study was conducted to investigate the changes of quality characteristics, and mineral, oxalate and phytate content during soymilk process. The yields of soymilk ranged from 8.43 mL/g in Bokwangkong to 9.15 mL/g in Bongeuikong and Hannamkong, and total soluble solid contents were ranged from 4.37°Brix in Anpyeongkong to 7.17°Brix in Bongeuikong, respectively. The pH and total acidity of soymilk ranged from 6.43 to 6.86 and from 1.48% to 1.65%, respectively. The viscosity of soymilk was the highest value of 20.80 cP in Hannamkong and the lowest value of 15.73 cP in Dawonkong. The highest value of calcium content of soymilk was 1.589 ㎎/g in Seonheukkong, and oxalate and phytate in soymilk were high at 2.14 ㎎/g in Hannamkong and 2.18 ㎎/g in Anpyeongkong, respectively. The transfer ratio of oxalate from soybean to soymilk was the highest value of 77.6% in Jinpumkong 2, and one of the phytate was the highest value of 87.5% in Dongpuktae and the lowest value of 13.9% in Hojangkong.

국산 장려콩으로 만든 두부의 Mineral, Oxalate 및 Phytate 함량과 품질특성

김기찬(Ki Chan Kim),황인국(In Guk Hwang),김현영(Hyun Young Kim),송항림(Hang Lin Song),김홍식(Hong Sig Kim),장금일(Keum Il Jang),이준수(Junsoo Lee),정헌상(Heon Sang Jeong) 한국식품영양과학회 2010 한국식품영양과학회지 Vol.39 No.7

국산 콩으로 제조한 두부의 품질특성과 원료 콩과 두부에서의 oxalate와 phytate의 함량을 분석한 결과는 다음과 같다. 두부의 수율 및 수분함량은 각각 137.77~201.91% 및 74.42~80.01% 범위로 나타났으며, 색도는 검은색 외피를 갖고 있는 청자콩, 다원콩, 선흑콩 및 검정콩4호가 L값은 53.05~63.23, a값은 3.18~5.85 및 b값은 3.28~6.02로 다른 품종들에 비해 L값은 감소하였고 a값은 증가하였다. 두부의 hardness, cohesiveness, elasticity는 품종에 따라 각각 537.36~1696.05 g, 0.20~0.37 및 2.27~3.76으로 차이를 보였다. 두부의 calcium 함량은 0.586~1.488 ㎎/g 범위였으며, oxalate 함량은 0.01~0.40 mg/g 범위에서 검정콩4호로 조제된 두부가 가장 높은 함량을 나타내었고 phytate는 0.01~0.41 ㎎/g으로 다원콩으로 만든 두부가 가장 높은 함량을 나타내었다. 콩에서 두부로의 oxalate 및 phytate의 전이율은 각각 0.31~19.70 및 0.41~19.70%로 나타났다. 따라서 국산 장려콩을 이용하여 두부를 제조할 경우 phytate의 전이율이 높고 oxalate의 전이율이 낮은 한남콩, 다원콩 및 보광콩이 좋을 것으로 생각된다. This study was conducted to investigate the changes of mineral, oxalate and phytate during tofu processing with Korean recommended soybean cultivars. Fourteen cultivars were selected by distribution of calcium, oxalate and phytate contents. Tofu was manufactured and analyzed for quality characteristics, mineral, oxalate and phytate contents. The yield and moisture contents of tofu ranged from 137.77% in Anpyeongkong to 201.91% of Geomjeongkong 4, and 74.42 (Bongeuikong)~80.01% (Hojangkong), respectively. The lightness (L-value), redness (a-value) and yellowness (b-value) ranged from 53.05 (Dawonkong) to 86.16 (Jipumkong 2), -2.04~5.85, and from 3.28 in Geomjeongkong 4 to 16.17 of Cheongjakong, respectively. The hardness of tofu with selected soybean cultivar ranged from 537.36 g (Dongpuktae) to 1696.05 g (Jinpumkong 2). The highest calcium content was 1.488 ㎎/g in Dawonkong, oxalate and phytate in tofu were high at 0.40 ㎎/g in Geomjeongkong 4 and 0.41 ㎎/g in Dawonkong, respectively. The transfer ratios of oxalate and phytate from soybean to tofu were ranged from 0.31~19.70 and 0.41~19.70%, respectively.

유한요소법을 이용한 자기부상용 선형유도기의 운전 특성 분석법

김기찬(Kim, Ki-Chan) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.7

본 논문에서는 유한요소법을 사용하여 자기부상열차용 선형 유도 전동기의 효율적인 운전곡선 도출 방법을 제안한 다. 긴 시간의 동특성 해석을 위해 선형유도기 모델을 선형에서 회전형 타입으로 변환하고, 제어시 필요한 슬립 파라미터를 전자장 해석을 통하여 효과적으로 도출하였다. 견인용 선형유도전동기는 인버터에 의해 저속의 정토크 영역에서는 전압/주 파수 (V/f) 일정제어를 수행하고, 고속에서의 정출력 영역에서는 전압을 고정시키고 주파수를 증가시키면서 제어한다. 따라 서 논문에서는 정토크 및 정출력 영역의 운전 특성을 도출하기 위해 각 구간에서 일정한 스텝으로 슬립특성 곡선을 도출하고, 차량의 운전 상태에 따른 슬립 및 주파수를 특성곡선의 보간법에 의해 결정한다. 본 방법을 이용하면 차량의 임의의 부하상 태에 따라 최적의 운전 지령을 제시할 수 있다. This paper proposes a novel analysis method on the driving performance of LIM (linear induction motor) by FEM (finite element method). First, a linear model was converted with a rotation model to perform the dynamic analysis for a long time. Through the FEM model, the slip parameter for the control algorithm could be induced effectively. The LIM for the traction system was performed at a constant V/f in the region of constant torque, and a constant V and variable f in the region of constant power. Several slip characteristic curves according to the voltage and frequency were calculated by FEM in advance. The driving performance was then induced by interpolating the slip characteristic curves according to the load of the vehicle.

기업생태계 전강성의 국제비교: 한국, 독일, 일본

김기찬 ( Ki Chan Kim ),존로렌스Enriquez ( John Laurence Enriquez ) 한국중소기업학회 2015 기업가정신과 벤처연구 Vol.18 No.2

In the race of economies pitting against each other, some have managed to rise above the competition not by responding to others`` actions but by creating a new condition that will reshape the industry in their favor. For the past few decades, Korea has been able to achieve constant growth (Bae and Rowley, 2004; Dana, 2007; Waechter and Ratten, 2007). To cope with unstable environments, Korea has chosen to continually design technological and organizational architectures aside from simply innovating new products. The Healthiness of Business Ecosystems Index (HeBEx) conceptualized a model for measuring business health, and also operationalized it. This study used HeBEx as a basis of comparison for Korea, Germany, and Japan. Based on the results, this research points out the strengths and weaknesses of the Korean Economy, and suggests some courses of action towards achieving sustainable growth. As Korea``s economy has turned into a low-growth economy, Korea needs to find new growth engines for sustainable economy development. Taking cue from Germany and Japan, Korea needs to focus on the development of advanced technology, and accelerate commercialization of R&D outcome.