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홍희성(Huiseong Hong),이상필(Sangpill Lee),이진경(Jinkyung Lee),이문희(Moonhee Lee),김성원(Sungwon Kim),서병석(Seobyeong Seok),이서희(Seohee Lee) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
In this study, the strength characteristics and microstructure of tungsten materials were investigated. Tungsten materials were fabricated using the combination of solid state sintering process and applied pressure. Tungsten powder was sintered at the sintering temperature of 1700 ℃ or less. Tungsten materials showed good flexural strength at ths sintering temperature of 1500 ℃, accompanying the creation of fine grain and the micro pore. However, tungsten materials fabricated at the sintering temperature above 1600 ℃ showed coarsening of tungsten grains and reduce flexural strength.
손태호(Taeho Son),이문희(Moonhee Lee),류황(Hwang Ryu),이철형(Choolhyeong Rhee),김남수(Namsoo Kim) 한국전자파학회 2020 한국전자파학회논문지 Vol.31 No.4
인체 극혈에 시침을 했을 때 원혈에서 고주파 스펙트럼의 변화를 측정하고, 이를 분석한다. 이로부터 시침 행위가 인체에 고주파 전기에너지를 생성시켜줌을 밝힌다. 원혈은 해당 장기의 특성을 나타내므로 원혈에서의 특성은 해당 장기의 특성이라 볼 수 있다. 따라서 급성치료에 적용되는 극혈 시침에 대한 원혈의 스펙트럼 관찰로부터 극혈 시침이 해당 장기에 미치는 영향을 파악할 수 있다. 본 연구에서는 6개 경맥에 대해 연구한다. 각 경맥의 원혈에 먼저 시침하고, 스펙트럼을 측정한다. 이후 극혈에 추가 시침하고, 원혈에서 스펙트럼의 변화를 측정한다. 측정은 잡음이 없는 무반사 차폐실에서 RF(Radio Frequency) 스펙트럼분석기로 측정한다. 분석결과, 극혈시침은 해당 장기에 고주파 전기에너지를 더 크게 하거나, 더 넓은 주파수대역을 가지도록 하며, 어떤 경맥에서는 특정 주파수 성분을 감소시킴이 나타났다. 이 연구결과에 의하면 극혈 시침이 해당 장기를 치료하는 것은 바로 1~80 MHz의 고주파 전기에너지를 생성시켜 주거나 빼주는 역할을 하는 것으로 설명된다. When an acupuncture needle was applied at the craft point, the high-frequency (HF) spectrum at the primary point is measured, and its impact is analyzed. The results reveal that the acupuncture action generates HF electric energy in the human body. As the characteristics of a human organ manifest at the primary point, the characteristics at the primary point can be regarded as a characteristic of the corresponding organ. Therefore, after acupuncture is applied to the craft point, observing the spectrum at the primary point can help elucidate the effect on the organ associated with the acupuncture craft point. In this study, we investigated six meridians, and the spectra were measured after applying acupuncture to the primary point. Subsequently, acupuncture was applied at the craft point, and the spectrum at the primary point was measured. The measurements were performed using a radio frequency spectrum analyzer inside an anechoic shielded room. The results of the measurements indicated that acupuncture at the craft point resulted in higher HF electrical energy or broadened the frequency band at the primary point(of the corresponding organ) and also reduced the frequency energy at a certain meridian. Therefore, treating organs by applying acupuncture at the craft point is described as producing or eliminating HF electrical energy of 1~80 MHz.
박상선(Sangsun Park),이문희(Moonhee Lee),이준겸(Joonkyum Lee) 한국생산관리학회 2015 한국생산관리학회지 Vol.26 No.3
최근 한국의 협동조합은 양적으로 크게 성장하고 있으나, 질적인 면에서는 많은 어려움을 겪고 있다. 한국의 협동조합들이 이 같은 어려움을 겪는 중요한 이유 중 하나는 사업체로서의 협동조합에 대한 이해가 부족한 것이다. 이 같은 관점에서 지금은 경영학 관점에서 협동조합을 이해하고 연구하는 것이 필요한 시점이다. 우리는 특히 공급사슬관리의 관점에서 협동조합 분석을 시도하였는데, 공급사슬관리의 연구 분야에서 중요하게 다루어지고 있는 공급사슬의 협력이 한국의 협동조합 공급사슬에서 어떻게 나타나고 있는지를 밝히고자 하였다. 구체적으로 협동조합 원칙의 이해와 실천이 공급사슬의 협력의 실행에 영향을 주는지, 또 이러한 협력의 실행이 실제 협동조합의 공급사슬 성과에 영향을 미치는지에 대한 답을 구하고자 하였다. 한국의 협동조합들을 대상으로 한 실증연구 결과, 협동조합의 공급사슬 협력은 협동조합의 원칙을 기반으로 하는 협력적 문화와 실제 협력의 실행, 두 단계로 이루어진다는 점을 밝혔고, 이러한 공급사슬 협력의 실행이 협동조합의 성과에 영향을 준다는 결과를 얻었다. In recent years, there has been a dramatic growth in the number of co-operatives in Korea. However, with this rapid expansion of co-operatives, they are also experiencing difficulties in qualitative aspects. One of the reasons for these difficulties is the lack of a business perspective in managing the co-operatives. Therefore, it is important and timely to understand and study co-operatives from a business administrative perspective. By focusing on analyzing co-operatives from the perspective of supply chain management, we investigate the role of collaboration in the supply chain of co-operatives in Korea. In particular, we study the impact of understanding and implementing the principles of co-operatives on the degree of collaboration practice and the performance of co-operative supply chains. Based on an empirical study using a sample of co-operatives in Korea, we show that the drivers of collaboration in co-operative supply chains consist of two stages of components: collaborative culture based on the principles of co-operatives and the actual practice of collaboration. We also show that the practice of collaboration affects the supply chain performance of co-operatives.
최철진(Cheoljin Choi),이문희(Moonhee Lee),손태호(Taeho Son) 대한전기학회 2019 전기학회논문지 Vol.68 No.1
In this paper, a 0.6∼6GHz quad-ridge horn antenna which can be used for the antenna measurement of 5.8GHz WiFi system from lowest frequency band of mobile LTE (Long Term Evolution) is designed and implemented. The quad-ridge horn antenna has quadruple ridges of exponential function, a back-short and a cavity. Based on this structure, we design the cavity size, ridge gap and feed gap to have broadband characteristics. For implementation, the plates material of aluminum and copper are used for the horn and four ridges, respectively. And the insulator supports are used to maintain the gap between ridges. By measurement, antenna has the gain of 6.2~13.35dBi with the return loss of less than –6dB (under VSWR 3 : 1) in the entire design band. The results of this study can be widely used to the antenna studies on the mobile communication including low frequency band of LTE, the EMI measurement and the standard calibration measurement.
메탈 노트북 Dual 밴드 WiFi MIMO용 고효율 슬롯안테나 설계 및 구현
유영혁(Younghyeouk Yoo),이문희(Moonhee Lee),손태호(Taeho Son) 대한전기학회 2018 전기학회논문지 Vol.67 No.10
MIMO(Multiple Input Multiple Output) slot antenna that operates on the dual WiFi band(2.401∼2.495GHz, 5.18∼ 5.825GHz), in this paper, was studied. The basic theory for the slot design is based on the coupling between adjacent slot, and slots are fed by the each microstrip lines. Two slot antennas for the MIMO operation are located on the left and the right side of top of the metal notebook, and grounds between a notebook and two microstrip feeding lines are connected. Measurement of return loss showed under -6dB on entire design band, and isolation was below than –30dB. Radiation efficiency, average gain and peak gain for the left and the right slot were measured in the anechoic chamber, and showed good performances as 57.25%, -2.42dBi, 5.64dBi and 55.35%, -2.61dBi, 6.42dBi for the 2.4GHz band and 55.89%, -2.58dBi, 7.3dBi and 53.79%, -2.8dBi, 7.54dBi for the 5GHz band.