• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.1309-1312
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• 1987

Hyperthermia for the treatment of cancer has been introduced for a long time and the biological effect for the use of hyperthermia to malignant tumors has been well established and encouraging clinical results has been observed. Unfortunately, the engineering or technical aspects of hyperthermia for the deep seated tumors has not been satisfactory. We have researched and developed the radiofrequency capacitive hyperthermia system (GHT- RF8). It was composed with 8-9 MHZ RF generator, capacitive electrode, matching system, cooling system, temperature measuring system and control computer. The thermal profile was investigated in agar phantom, animals and in human tumors, which was heated with capacitive RF device.

• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.1252-1255
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• 1987

In this paper an approach for the analysis of the transient field response of radially symmetric transducer due to a wideband ultrasonic pulse is presented, which is based on a development of Green's function and applies the linear system theory to obtain an analytic expression for the impulse response of an annulus with a planar or spherical geometry. For the focused annular array, the impulse responses of the indivisual annuli are convolved with the delayed excitation pulse, and then summed to obtain the resultant response of the array. This process is very effective in the study of the various focusing abilities of the annular array. For illustration, the field distribution of a five element annular array is treated in detail for several focusing system.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.21 no.48
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• pp.311-322
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• 1998

Today, as a globalization continues and international trading blocks are formed, world markets are intensely competitive and abound in product variety, volume, complexity and environment. An environmental management system comprises the environmental elements of the overall management system. The basic input to a management system is information from stake holders, the operational system and the environment, the outputs are decisions and informations. Specifically, green comsumer's needs and expectations are changing and diversifying, resulting in a changed global environment for industry. Due to these changes, many companies are striving to achieve the ISO 14000 environmental management system certification. In this paper, I will present the strategy of environmental management, system strategy and continue to build a unique environmental management system by analyzing companies that will be achieved the ISO 14000 certification. After companies establish an ISO 9000 quality system these companies should focus on improve toward their own quality systems and continue to build ISO 14000.

• 한국태양에너지학회:학술대회논문집
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• 2009.04a
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• pp.170-175
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• 2009

Apartment housing block has been spreaded according to rapid economic development and urbanization in Korea. A parking lot is located at underground, artificial ground is inevitably created in apartment housing block. Artificial ground creates different thermal environment compared to natural ground, because the composition and coverage of artificial ground are diverse. In this study, the effect of the artificial ground on building thermal environment will be disscussed by simulation. Considering the result of simulation, surface albedo is more important for building energy performance. A purpose of this study is to examine how the characteristic of surface effect to thermal environment, and to develop design method for sustainable outdoor space.

• Journal of the Speleological Society of Korea
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• no.89
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• pp.37-45
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• 2008

If a cave is developed and opened to the public, the pollution in caves is inevitable. This kind of environmental pollution is caused by an environmental pollution system that is formed by the interaction among various pollution factors, not by a single factor. The main causes of the pollution are the development of passage, installation of lamps, tourists, oxidation of fixtures, temperature rise and littering, which in turn causes environmental pollution such as green and black mold growth, vatting, exfoliation and water pollution.

• Mycobiology
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• v.38 no.4
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• pp.282-285
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• 2010

Cordyceps cardinalis successfully produced its fruiting bodies from multi-ascospore isolates. However, subcultures of multiascospore isolates could not produce fruiting bodies after few generations. Fruiting body production also differed from sector to sector of the same isolate. Single ascospore isolates were then co-inoculated in combinations of two to observe the fruiting characteristics. Combinations of certain isolates produced perithecial stromata formation, whereas other combinations did not produce any fruiting bodies. These results show that C. cardinalis is a heterothallic fungus, requiring two isolates of opposite mating types for fruiting body production. It was also shown that single ascospore isolates are hermaphrodites.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.10a
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• pp.93-93
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• 2018

집속초음파 추출법(Innovative Extraction by Focused Ultrasound, INEFU)은 기존의 추출법에 비교하여 식물세포벽으로부터 기능성 성분을 낮은 온도에서 높은 추출 효율을 얻기 위한 추출공정으로 적용하기 위하여 연구되고 있다. 본 연구에서는 그린커피빈(COFFEA ARABICA SEED)에서 Chlorogenic acid, Caffein, Caffeic acid의 기능성 성분 추출을 위해 INEFU를 적용하여 추출 효율에 미치는 요인을 평가하였다. 추출 변수의 최적화를 위해 추출 온도 및 추출 시간을 요인으로 하여 순차적인 최적화를 진행하였다. 동일한 추출조건에서 저온추출(CEM)과 INEFU를 비교하였을 때 INEFU에서 Chlorogenic acid, Caffein이 각각 2.1 와 2.2배 증가함을 확인하였다. 또한 Caffeic acid는 저온추출(CEM)에서는 추출되지 않았으나, INEFU에서는 추출되는 것으로 확인하였다. 본 연구를 통해 INEFU가 기존의 추출 공정에 비해 기능성 성분 생산에 보다 효과적임을 확인하였다.

• Journal of the Korean housing association
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• v.17 no.5
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• pp.17-25
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• 2006

This study begins to make inquires about user's opinion of introducing Interior Landscape into Apartment Housing to grip the problems of contemporary Interior Landscape and suggest the fundamental data to improve it. The city-ward drifting of population drawn from industrial development and aggravation of living condition bring about exclusion of nature and lack of green space. Furthermore, it increases the length of stay of urban liver in indoor space. Thus, dwellers' desire to Interior Landscape increase but housing can't follow it. The purpose of this study is to understand characteristics of Interior Landscape, derive essential factors, study plans, establish radical data, and suggest better plans including Interior Landscape through making inquires about user's opinion.

• Proceedings of the Korea Contents Association Conference
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• 2010.05a
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• pp.627-629
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• 2010

본 연구는 대기오염의 가장 주범인 이동형 차량이 배출하는 배기가스를 USN기술을 활용하여 실시간으로 확인하고 이 정보를 지속적으로 축적함으로써 차량의 오염물질배출상태, 차량의 노후상태 뿐만 아니라 차량의 효율적인 노선의 확보가 가능하도록 측정하고 모니터링이 가능하도록 시스템을 개발하여 일부를 현장 적용함으로써 향후 이동형 차량에 대한 대기오염 방지의 감소를 위한 정책 마련과 그 활용 가능성을 검증하였다.

• Advanced Composite Materials
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• v.18 no.2
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• pp.167-185
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• 2009

Environmental problems caused by extensive use of polymeric materials arise mainly due to lack of landfill space and depletion of finite natural resources of fossil raw materials like petroleum or natural gas. The substitution of synthetic petroleum-based resins with natural biodegradable resins appears to be one appropriate measure to remedy the above-mentioned situation. This study presents the development of a composite that uses environmentally degradable starch-based resin as matrix and natural mineral basalt fibres as reinforcement, and investigates the fibre's and the composite's mechanical properties. The tensile strength of single basalt fibres was verified by means of single fibre tensile tests and statistically investigated by means of a Weibull analysis. Prepreg sheets were manufactured by means of a modified doctor blade system and hot power press. The sheets were used to manufacture specimens with fibre volume contents ranging from 33% to 61%. Specimens were tested for tensile strength, flexural strength and interlaminar shear strength. Composites manufactured during this study exhibited tensile and flexural strength of up to 517 MPa and 157 MPa, respectively.