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한동근,이균식,최종우 한국식품유통학회 2019 食品流通硏究 Vol.36 No.4
Meal-worms, protaetia brevitarsis seulensis larvae, adult crickets and beetle larvae were newly registered on Korean Food Standards Codex as food in 2016. Since then, the number of farmers producing edible insects began to explode, and edible insects were expected to be the most promising market in the insect industry. However, the edible insect-producing farmers has been suffered financially since edible insect sales have started to decline in 2018. So, this study will analyze management efficiency of the edible insect-producing farms using Data Envelopment Analysis(DEA) to minimize the financial damage of the farms. And the purpose of this study is to suggest the directions of policy on edible insects through DEA results. Followings are the directions of policy on edible insects as a result of this study. First, the result shows that meal-worm-producing farms manage their farms most efficiently among the edible insect-producing farms. So, if consumer demand on meal-worm only increase, meal-worm market will be the most stable market. To increase the demand on meal-worm, a consumption monitoring system for meal-worms should be established, and the consumer’s preferred form of intake should be identified and supplied. Second, protaetia brevitarsis seulensis larvae farms were figured out to be the most inconsistent production methods or processes. In other words, this insect is the most differentiated among edible insects. Therefore, it is necessary to establish a strategy for segmented market by identifying consumer’s preference attributes(e.g, price or nutrition). Third, as adult cricket-producing farms were shown to be less efficient due to their low overall input, the government’s financial support for insect-farms should be made more active for farmers who produce adult crickets than other insects.
Aurical Visible Speech(AVS)를 활용한 보청기 청각재활
한동근 한국청각언어재활학회 2008 Audiology and Speech Research Vol.4 No.1
보청기를 통해 듣는다는 것은 청력손실자에게 있어서는 새롭게 못 듣던 소리를 다시금 듣게 되는 기회를 제공하기 도 하지만, 여러가지 불편함을 감수해야 하는 또 하나의 도전이기도 하다. 이러한 도전에 잘 적응한 경우에는 큰 어려 움 없이 보청기를 통해 듣기가 익숙해지지만 그렇지 못하 고 도중에 포기하거나 보청기 착용자체에 부정적인 인식을 하는 경우도 많이 볼 수 있다. 이러한 관점에서 볼 때, 과거에는 보청기의 성능이나 기술 적인 측면에 주로 관심을 보였다면, 최근에는 기술적인 측면뿐만 아니라 보청기 착용자들의 실생활적인 측면에서의 만족도를 평가하는 다양한 조사들이 시도되고 있다. 여러 시
한동근,전강수 한국경제학회 2000 經濟學硏究 Vol.48 No.2
본 논문은 경제위기의 근본 원인을 토지투기에서 찾는 Georgist의 경제위기론을 소개하고, 이를 기초로 한국의 경제위기를 진단하였다. 1960년대 이후 한국경제의 현실은 Georgist의 경제위기론에 크게 부합한다. 심각한 불황의 앞에는 토지투기가 있었고, 불황의 진행도 대체로 '토지가치의 투기적 상승 → 건설 경기의 후퇴 → 일반 경기의 후퇴'라는 순서에 따라 이루어졌다는 사실이 확인되었다. 또 지가의 투기적 상승은 고임금, 고금리, 고물류비용 등 고비용 구조의 요인들과, 토지 담보 대출과 그로 인한 금융시스템의 취약성, 기업의 비효율적 투자 등 저효율 구조의 요인들을 유발함으로써 경제구조의 취약성을 심화시켜 왔다는 사실도 밝혀졌다. 요컨대 토지투기는 한국 경제위기의 중요한 한 요인이었던 것이다.
신규 Bis-GMA 유도체 및 Oligolactide를 함유한 하이브리드형 생분해성 골시멘트의 제조
한동근,진용옥,박병주,안광덕 한국생체재료학회 2005 생체재료학회지 Vol.9 No.4
In order to endow biodegradability to the existing Bis-GMA bone cement, novel biodegradable hybrid 3MA mix bone cements were prepared by using Bis-GMA derivatives (3MA and their mixture) as a prepolymer, AW-GC as a bioactive inorganic filler, and lactide-based oligomer, GL7-Ac as a biodegradable material. The obtained biodegradable bone cements showed suitable curing time of 10-15 min. Polymerization shrinkage of the biodegradable bone cements increased with increasing benzoyl peroxide (BPO) concentrations and decreasing oligolactide contents, whereas their mechanical properties displayed inverse trends with the results of polymerization shrinkage. In addition, the biodegradable bone cements were degraded very slowly after immersion in phosphate buffered saline solution for 28 days, but maintained still high mechanical property. Therefore, newly biodegradable hybrid 3MA mix bone cements containing both AW-GC and GL7-Ac oligolactide are expected to be useful for high-performance biocompatible bone cements that would be replaced with the existing PMMA and Bis-GMA bone cements.
카르복실산이 그라프트된 PLLA 필름과 이중기공 지지체의 표면 특성 및 세포점착 거동
한동근,안광덕,양희석 한국생체재료학회 2004 생체재료학회지 Vol.8 No.3
Biodegradable poly(L-lactic acid) (PLLA) scaffolds have insufficient initial cell binding sites and limited ability to cell adhesion for in vitro and in vivo tissue culture because of their hydrophobic characteristics. Various efforts are now being attempted to overcome these problems. In this study, the biodegradable nonporous PLLA films and their 3D dual pore scaffolds were fabricated by using the solvent casting method and both gas foaming and phase separation techniques, respectively. The obtained hydrophobic nonporous film and dual pore scaffold surfaces were hydrophilized by using plasma glow discharge treatment and the grafting of carboxyl acid-containing monomers such as acrylic acid (AA), maleic acid (MA), itaconic acid (IA), and trans-aconitic acid (tAA). The surface modification of nonporous films and their dual pore scaffolds was confirmed by water contact angle, electron spectroscopy for chemical analysis (ESCA), and carboxyl group content. The hydrophilized nonporous PLLA films and their dual pore scaffolds which have carboxyl acids on their surface by plasma treatment demonstrated the improved adhesion and proliferation of fibroblasts as compared to the unmodified one.
자외선 표면개질에 의한 술폰산화 폴리에틸렌옥시드가 그라프트된 의료용기능성 셀루로오즈의 제조
한동근,박기동,안광덕,김영하 한국생체재료학회 2004 생체재료학회지 Vol.8 No.3
New water-soluble and photoreactive sulfonated poly(ethylene oxide) (PEO, MW = 1,000) containing 4-azidobenzaldehyde-2-sodium sulfonate (ABS) (ABS-PEO-SO3) was synthesized and then grafted on cellulose (Cell) by UV irradiation to yield functional PEO-SO3-grafted cellulose (Cell-PEO-SO3) to use for biomedical materials. The surface-modified cellulose was made by first coating aqueous solution of 20% ABS-PEO-SO3 on cellulose film for 24 h, followed by drying, and then UV irradiation (400 W) for 10 min. It was confirmed that ABS-PEO-SO3 was synthesized well from the results of elemental analysis, FTIR, and 1H-NMR. The surface properties of the modified cellulose were evaluated by measuring ATR-FTIR, ESCA, SEM, and water contact angle. As compared to cellulose control, the modified cellulose demonstrated similar smoothness and much increase in hydrophilicity (complete wetting) due to the grafting of hydrophilic ABS-PEO-SO3. The interaction of the modified cellulose and platelet was examined by platelet adhesion test. The modified cellulose showed less adhesion and shape change of platelets than cellulose control, indicating the enhanced blood compatibility. Therefore, this functional Cell-PEO-SO3 is expected to be useful for blood contacting materials and artificial organs including a hemodialyzer for an artificial kidney.