• Economic and Environmental Geology
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• v.39 no.4 s.179
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• pp.385-402
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• 2006

Paleomagnetic studies have made remarkable contributions to the understanding of many geological aspects of Korea for the last 40 years, such as the collisional processes of Korean Peninsula, the development of basins in relation with fault systems, the opening and evolution of the East Sea, and the reconstruction of paleogeographic configuration. These contributions have played an important role in the escalation of geology in Korea by elucidating the mechanisms on Processes of fragmentation and amalgamation of the Peninsula, mountain building, igneous activities, metamorphism, and folding and faulting based on the view of plate tectonics. This paper is intended to introduce and summarize the paleomagnetic research papers designed to decipher the tectonic processes of Korea, according to the geologic ages of the studied rocks.

• Applied Chemistry for Engineering
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• v.9 no.4
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• pp.529-535
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• 1998

This study was made to investigate the effect of variation in pulping process conditions such as wastepaper blending treatments, temperature, and chemical blending treatments on the deinked pulp. Design of experiments was used to select the major factors which significantly influenced on the deinked pulp. As one of the statistical analysis technique, analysis of variance and multiple comparison technique was used to find the best process condition and the predicted values and confidence intervals for brightness and strength were obtained. In the condition of $Na_2SiO_3$ 2.0%, $H_2O_2$ 0.5% and wastepaper blending treatments (KONP : AONP : OMG = 40 : 30 : 30 wt %) the highest brightness of 50.5% was predicted with 90% confidence interval (49.0, 52.0). On a concentration of $H_2O_2$ 0.5%, the highest tensile index of $35.7N{\cdot}m/g$ was predicted with 90% confidence interval (34.6, 36.6) at the pulping temperature of $50^{\circ}C$. On a concentration of surfactant 0.1%, the highest burst index of $0.129kPa{\cdot}m^2/g$ was predicted with 90% confidence interval (0.125, 0.133) at the pulping temperature of $50^{\circ}C$.

• 한국도로학회:학술대회논문집
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• 2001.10a
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• pp.23-31
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• 2001

국내 포장가속시험기의 개발은 도로신소재 개발, 중차량 교통하중의 영향분석, 온도 습도에 따른 포장체의 거동분석 등을 현장조건과 유사한 조건에서 실험 가능하게 함으로써 국내 도로분야의 연구 수준을 향상시킬 것으로 기대된다.

• The Korean Journal of Petroleum Geology
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• v.2 no.2 s.3
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• pp.83-90
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• 1994

Thermal maturation and diagenesis of the Gyeongsang Supergroup in the Euiseong area are studied by means of organic geochemical techniques and illite crystallinity. Black mudrocks of the Singdong Group contain organic matter of $0.5{\~}2{\%}$ derived from higher plants, being compared to type Ⅲ. Thermal maturity of organic matter reached dry gas generation phase. Tmax by Rock Eval pyrolysis varies between $578^{\circ}C$ and $593^{\circ}C$ regardless of stratigraphic position and localities, and vitrinite reflectance is about 2.9 and $3{\~}4{\%}Ro$ in the Jinju and the Nagdong Formations, respectively. Vitrinite reflectance measurements indicate that the maturation is mainly due to burial and partly to be affected by post-depositional intrusions. Illite crystallinity values from the Nagdong, Hasandong, Jiniu Formations and part of the Iljig Formation are plotted around the boundary between diagenesis and anchizone, indicating dry gas generation stage. However, the values are not dependent on stratigraphic position. The values from the Iljig, Hupyeongdong, Geomgog, and Sagog Formations fall into the range of anchizone, probably resulted from the post-depositional intrusions which occur locally. Both organic geochemical and illite crystallinity data indicate thermal maturation stage of dry gas generation. Diagenesis of the Gyeongsang strata is mostly controlled by burial, and partly affected by post-depositional intrusions. Paleotemperature of the Sindong Group is estimated at around $200^{\circ}C$ on the basis of illite crystallinity.

• Journal of the Korean Geographical Society
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• v.47 no.6
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• pp.884-898
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• 2012

Place names represent a lot of information about the region and the life of the local residents. In particular, old geographical names have more spatial informations than recent place names. This paper tried to analyze the distribution and characteristic of 'Dumo' which is one of the ancient place names and was studied by Nam youngwoo in 1996 for the first time. After considering the etymology and phonological structure of 'Dumo', the name 'Dumo' included the geographic conditions related to a mountain and river in itself. The total number of place names in the line of 'Dumo' which were collected by the author were 417 and they were distributed evenly on the Korean Peninsula. 85% of them were used for the human place names and 73% of the human place names were served as settlement names standing for a village or an administrative district. Thus the author analyzed the location and diffusion of 220 of settlement names in depth. As a result, villages named in the line of 'Dumo' preferred southern or eastern exposure and located in front of a mountain and around a river. After a village name 'Dumo' was set up, it produces other similar names in the line of 'Dumo' near the village so most place names of 'Dumo' were found with several names of 'Dumo' not alone.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.30 no.1
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• pp.24-32
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• 2018

In this paper, analytical studies were conducted to obtain optimal design factors and analysis parameters of liquid nitrogen cooling exchanger applied in cryogenic refrigerator. The target value of heat transfer rate was more than 1 kW and pressure drop was less than 40 kPa. Design factors of cryogenic heat exchanger included width of channel and configuration of paths. Analytical factors of liquid nitrogen cooling exchanger included temperatures of coolant header surface and inlet liquid nitrogen. The width and number of channels in the design parameters were 0.0050~0.0150 m and 4~8, respectively. The configuration of channel path was 4 ways. Temperatures of coolant header surface and inlet liquid nitrogen in analytical parameters were 74 to 78K and 82 to 86K, respectively. As result, the design factor and analysis parameter satisfying the target values were obtained. The biggest heat transfer rate was 1.36 kW with pressure drop of 32.26 kPa.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.79-79
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• 2011

사파이어 기판에 성장된 ZnO 박막을 급속 열처리 하여 열처리 효과가 박막의 특성에 미치는 영향을 분석하였다. ZnO 박막은 RF 마그네트론 스퍼터 증착법으로 $500^{\circ}C$에서 성장하였고, 성장 된 시료를 산소 분위기에서 $600^{\circ}C{\sim}900^{\circ}C$로 온도 변화를 주어 3분 동안 열처리를 하였다. Hall 효과 분석에 의한 ZnO 박막의 전자 이동도 특성은 열처리 온도가 증가함에 따라 점차 증가하는 경향을 나타내어, $900^{\circ}C$ 열처리의 경우 23 $cm^2$/Vs의 가장 높은 값을 보였다. 한편 X-ray 회절 분광법에 의한 ZnO 박막의 (002) peak를 분석한 결과 열처리 온도가 증가함에 따라 peak의 세기는 증가하고 그 반치폭이 점차 감소함으로써 시료의 결정학적 특성이 향상됨을 확인 할 수 있었다. 이와 같이 열처리 온도에 따라 전기적 결정학적 특성이 향상되는 이유는 ZnO 박막에 존재하는 native defect들이 열적으로 passivation되고, 결정격자들의 배열이 열에너지에 의해 안정화 되면서 나타나는 현상으로 풀이 된다. 이와 함께 본 연구에서는 ZnO 박막의 열처리 온도 변화에 따른 광학적 특성 변화에 대해서도 보고할 예정이다.

• Conservation Science in Museum
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• v.3
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• pp.21-27
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• 2001

In National Central Museum, we recently preserved paper cultural assets, such as ancient maps, books and antique documents etc, to prepare "A Dynamic World of External Relations in Goryeo & Joseon Dynasty". The paper cultural assets generally react sensitively to their environments; temperature, humidity, light and physical force acting. Biological damages, which are caused by microbe, contraction, swelling and damage from insects occurred. Wrinkles on relics, which are made my physical force, stains on relics which are due to moisture, weakening of adhesive strength and damages from insects were found during the recent preservation handling. Therefore we are trying to find out any damage, which could be occurred in paper cultural assets and introduce brief emergency operation to prevent the damages and develop the preservation handling.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2006.06a
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• pp.301-302
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• 2006

초고주파 전력 증폭기의 바이어스 전압을 조절하여 온도 변화에 따른 드레인(Drain) 전류의 변화를 억제하기 위한 저가의 능동 바이어스 모듈을 개발한다. 능동 바이어스 모듈을 5 W급 초고주파 전력증폭기에 적용하였을 경우, $0{\sim}60^{\circ}C$까지의 온도변화에 대하여 소모전류 변화량은 0.1 A 이하로 되어야 한다. 본 기술 개발 대상인 능동 바이어스 모듈의 성능 시험을 위한 대상 전력증폭기는 $2.11{\sim}2.17GHz$ 주파수 대역에서 32 dB 이상의 이득과 ${\pm}0.1\;dB$ 이하의 이득 평탄도, -15 dB 이하의 입.출력 반사손실을 가진다.

• Economic and Environmental Geology
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• v.39 no.4 s.179
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• pp.353-368
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• 2006

The modem kinematic behaviors of the rigid block motions are well developed using synthetic analyses of paleomagnetic, petrologic, paleontologic and geophysical data which have been established in the last a quater of a century. Phanerozoic geodynamic evolution and tectonic episodes of the Korean Peninsula and East Asia region are discussed and summarized here.