• Journal of the Korea Academia-Industrial cooperation Society
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• v.2 no.2
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• pp.95-99
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• 2001

We can embody a variable size of high classic industrial material. and jewelry design within 5 hours. using a rapid prototype 3D CAD, which includes 30 kinds of database selected by jewelry designers. If the jewelry can be investigated and the customer can modify it right away ; then the qualify of the jewelry is much better. Based on our investigation. we can reduce 30$\%$ of the development cost by using a standard database. We can also create a new design with complex design element in the database. Therefore, we may reduce the production time to less than 5 hours by using a Powerful technique system rather than producing hand-made jewelry, which can take more than 27 hours.

• The Korean Journal of Community Living Science
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• v.27 no.2
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• pp.233-243
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• 2016

This study examined the antioxidant activity and lipid composition of rats fed a high fat-high cholesterol diet containing Salvia plebeia water extract. Three levels (50 mg/kg, 200 mg/kg, 500 mg/kg) of Salvia plebeia water extract were administered to seven weeks old male Sprague Dawley rats for four weeks. The activity of glutathione peroxidase in serum was high in all groups that received the Salvia plebeia water extract (p<0.05). The glutathione reductase activity was high (p<0.05) in groups that received 50 mg/kg and 500 mg/kg of Salvia plebeia water extract. When rats received Salvia plebeia water extract, the content of MDA (malondialdehyde) in the serum and liver was low in all groups. In addition, the serum total lipid, triglyceride, total cholesterol and LDL-cholesterol contents decreased significantly (p<0.05). Total cholesterol and triglyceride levels in the liver were significantly lower in the group that received the Salvia plebeia water extract than in the control group (p<0.05). Salvia plebeia water extract improves lipid metabolism and it almost meets with the increase of antioxidant activity and peroxide formation reduction. Based on these results, supplemented of a high fat-hypercholesterol diet with Salvia plebeia can increase antioxidant activity and depress peroxide formation in serum, as well as liver cholesterol and triglycerides.

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.143-146
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• 2009

One of the most important issues of crystalline silicon solar cell is minimizing reflectance at the surface. Laser texturing is an isotropic process that will sculpt the surface of a silicon wafer, regardless of its crystallographic orientation. We investigated surface texturing process using Nd-YAG laser ($\lambda$=1064 nm) on multi-crystalline silicon wafer. Removal of slag formed after the laser process was performed using acid solution (HF : $HNO_3$ : $CH_3COOH$ : DI water). The reflectance and carrier lifetime of the samples were measured and analyzed using UV-Vis spectrophotometer and carrier lifetime tester. It was found that the minimum reflectance of the samples was 16.39% and maximum carrier life time was $21.8\;{\mu}s$.

• Korean Journal of Soil Science and Fertilizer
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• v.29 no.3
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• pp.212-217
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• 1996

Investgated in relation to Methane emission on dry seeded rice culture was flooding and intermittent irrigation and application time of rice straw in clayey soil. Negative peaks of the methane emission before 3 leaves stage which were never seen in the transplanting cultivation was found and the highest peak was come out at the heading stage. Total amount of emitted methane was lower about 40% than that of the transplanted. Methane emission decreased about 19% by intermittent irrigation. Compost and NPK application reduced methane about 70% and 80% in comparisin with rice straw. Rice straw application one month before sowing reduced methane emission than the application just before sowing.

• Journal of Sericultural and Entomological Science
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• v.48 no.1
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• pp.21-24
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• 2006

Purification method of unsaturated fatty acid from silkworm pupa has been set up. Over 70% of total fatty acid was unsaturated form. Unsaturated,fatty acid from silkworm pupa improved hyperlipemia in the induced hyperlipemial mice, increased the production of collagen, inhibited the activity of collagenase, and cured the dryness-induced skin very quickly.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 2003.04a
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• pp.97.1-97
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• 2003

깻잎중의 각종 성인병 관련 생리기능성을 탐색하여 고부가가치의 기능성 제품을 개발하고자 먼저 1월, 5월 시설재배 깻잎과 8월 노지재배 깻잎의 extracts 수율을 조사하였다. 8월 노지에서 재배한 깻잎의 알콜 extracts 수율이 29%로 제일 높았고 1월과 5월 시설재배 깻잎보다는 8월 노지재배 깻잎의 extracts수율이 더 높았다. 물과 30% 알콜 깻잎 추출액에 대한 생리기능성으로 혈전용해활성은 5월 시설재배 깻잎의 알콜 추출물이 8.2 U로 제일 높았고 안지오텐신 전환효소(ACE) 저해활성은 1월 시설재배 깻잎의 물 추출물에서 64.5%의 높은 활성을 보여 고혈압 예방(치료) 제품개발에 매우 유용할 것으로 생각된다. 항산화활성은 물 추출물보다는 대체로 30% 알콜 추출물에서 높았고, 특히 8월 노지재배 깻잎의 알콜 추출물에서 69%을 보였다. 고지혈증 예방(치료)에 관련된 HMG-Co A reductase 저해활성은 8월 노지재배의 물 추출물에서 83%의 높은 활성을 보였고 elastase 저해활성은 8월 노지재배 깻잎의 30% 알콜 추출물에서 47.5%의 활성을 보였다. 아질산염 제거활성과 SOD유사활성 및 tyrosinase 저해활성 등은 없거나 매우 미약하였다.

• Annual Conference of KIPS
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• 2000.04a
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• pp.1129-1132
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• 2000

최근의 정보기술 발달로 지리 정보의 이용 영역이 점점 확대되고 있다. 특히 지리정보 시스템은 토지, 도시 및 지역, 시설물 관리, 교통, 환경, 자원, 기상 및 국방정보를 비롯하여 수송 및 배달, 공익사업 등 다양한 분야에 활용도가 풍부하다[1][4]. 본 논문은 가스 잔류량 원격 탐지용 송.수신 제어부와의 인터페이스 기능을 갖는 연결보드와 이 보드를 통해 들어오는 수용가(고객)의 사용검침정보를 GIS(Geography Information System)과 통합하여 통계자료 분석 및 보고서를 발행하고, 사용에 따른 실시간 저장소 위치정보를 실시간으로 모니터링 및 사용자 관리할 수 있는 원격 관제시스템을 개발했다. 현재 가스 공급자들이 겪고있는 어려움 중의 하나는 노동력에 의한 가스 잔류량을 수시로 검침하고 검침량에 따라 수금을 하고 있다. 본 시스템의 개발로서 원격에서 가스 잔류랑 검침 및 가스탱크 교환시기, 고객관리 및 고지서 발행과 GIS를 이용한 재충전 또는 교환할 가스탱크의 위치 및 시기를 쉽게 파악하고 긴급 상황에 따른 조치를 신속하게 취할 수 있다. 그리고 가스저장소 실 시간관제, 저장소의 현황분석을 통한 가스 공급자의 관리업무에 대한 효율성을 도모한다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.27 no.7
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• pp.612-619
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• 2016

In this paper, a dual band electrical beam tilting array antenna with bi-directional directivity is designed. Radiating element operates at dual-resonance frequencies and is designed as planar dipole using PCB. In order to tilt the main beam, the phase delay line is designed by use of only the phase shifting line of a $50\Omega$ microstrip line for broadband. The designed antenna has tilting angle of $0^{\circ}$ to ${\pm}8^{\circ}$. For validation of the designed antenna specification, the array antenna is fabricated and the performances are measured. Comparison between theory and experiment shows good agreement.

• Food Science of Animal Resources
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• v.20 no.3
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• pp.173-180
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• 2000

본 연구는 돈육과 계육의 부가가치를 높이고 영양생리학적으로 우수한 기능성의 육제품을 개발하여 국민건강의 증진에 기여하고 농가에 보다 높은 수입과 국내 축산식품의 원할한 생산, 유통을 돕기 위하여 계육과 돈육의 혼합비율에 따른 이화학적 특성 검사와 관능적 특성 및 물성차이 측정을 하였다. 계육 함량 60%까지의 소시지의 경우 이화학적 특성, 관능적 특성 및 물성차이 검사 결과 돼지고지 100%군과 큰 차이가 없는 것으로 나타났으며, 일반성분 검사결과 대조군에 비해 수분함량이 높고 지방 함량이 낮게 나타났으며, pH와 보수성에 있어서는 유사하게 나타나 계육의 이용용 증대를 유도하는 차원에서 60%까지 계육을 첨가하여 소시지를 제조해도 양질의 단백질 자원으로 제품의 질에 미치는 영향이 좋고 공학적으로도 적합함을 입증할 수 있었다.

• Journal of the Korean Solar Energy Society
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• v.34 no.2
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• pp.16-23
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• 2014

This paper presents a renewable energy configuration plan of Micro grid in Gapa Island. To analyze the characteristics of Micro grid, BESS (Battery Energy Storage System), PMSG (Permanent Magnet Synchronous Generator) and SCIG (Squirrel Cage Induction Generator) are first modelled. The PMSG and SCIG will operate with basis on the real power curve. when the total power demand is larger than the total power generation, the BESS will be operated and the SOC (State Of Charge) is reduced. If the value of SOC could drop down to limited value, the system may be broken because of the voltage drop of BESS. To solve this problem, a DG (Diesel Generator) is used to charge the BESS and keep the voltage value of BESS with in a allowance limit. This paper represents simulation result when PMSG, SCIG connected to the Micro grid installed in Gapa Island. The simulation is carry out by using PSCAD/EMTDC program with actual line constant and transformer parameter in Gapa Island.