• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 D
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• pp.2089-2092
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• 2002

The PID controller have the simple structure and show the comparatively good control performance. Crystal Grower(FF-CZ150) melt polycrystalline silicon at the temperature of about 1450$^{\circ}C$, then grow it into a single crystalline ingot. The automatic diameter control system of the Crystal Grower has a good performance with only PD control. But it contain the integrator in the plant which has a long time delay. In this paper, we show the secondary approximate model and applies time delay controller which has good performance for the plant with long time delay. It will be able to improve the response characteristic against a standard input and a load disturbance.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 V
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• pp.2799-2802
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• 2003

The automatic diameter control system of the Crystal Grower has a good performance with only PD control. But it contained the integrator the plant which has a long time delay. In this paper. we show the secondary approximate model and applies time delay controller which is good performance for in the long time delay plant. It will be able to improve the response characteristic against a standard input and a load disturbance.

• Asian-Australasian Journal of Animal Sciences
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• 제23권2호
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• pp.279-286
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• 2010

Livestock production in Vietnam is, as in most Asian countries, increasing rapidly and changing into specialized highly intensified operations. The volume of animal excreta generated exceeds the capacity of the operation land base and cannot be utilized efficiently. As a consequence, there is a loss of plant nutrients from livestock farms that causes environmental pollution. This study carried out a feed and excretion experiment measuring fecal characteristic, daily fecal production, daily nitrogen and phosphorous excretion from grower-finisher pigs fed prevalent rations in Vietnam. Furthermore, equations for assessing the excretion were tested, which can be used in farm models for optimal recycling of manure while focusing on reducing pollution. The results indicated that fecal production and nutrient excretion were affected by the different rations tested. This study showed that five selected equations for predicting excretion from grower-finisher pigs in Danish conditions can also be used with precision in Vietnamese pig farming systems. The equations have been proven valid and can, therefore, be used as a much needed tool for assessing fecal production and nitrogen in excreta on pig farms. The study also showed that about 12% of nitrogen excreted was emitted during housing. Waste water contains more than half of the nitrogen excreted, mainly in ammonium form which has a high potential for gaseous emission.

• 한국농림기상학회지
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• 제20권2호
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• pp.214-227
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• 2018

농업생태계의 복잡한 상호작용을 고려하여 작물생육을 모의하기 위해 객체지향형 작물모델을 개발하였다. 대기, 작물, 토양 및 재배관리를 대표하는 Atmosphere 클래스, Plant 클래스, Soil 클래스, Grower 클래스가 설계되었다. 또한, 이들 클래스들이 구현된 객체들을 하나의 시스템으로 연계하여 통합시스템을 구축하였다. 사례연구로써, 농촌진흥청 본원의 전작시험 포장에서 1985년부터 1986년까지 수행된 실험에서 얻어진 옥수수와 콩의 수량 관측자료와 통합시스템으로 모의된 결과값을 비교하였다. 단작과 간작조건에서 통합시스템으로 예측된 옥수수의 수량은 4% 이내의 낮은 오차율로 모의되었다. 이삭중을 제외한 지상부 건물중의 경우, 옥수수와 콩의 관측값보다 과소추정되는 경향이 있었다. 예를 들어, 옥수수의 경우 잎과 줄기의 생체중 모의값은 관측값에 비해 약 31% 적게 추정되었다. 옥수수가 수확된 시점에서 같이 수확이 된 콩의 경우, 옥수수 보다는 비교적 작은 과소추정 오차를 가졌다. 비록 간단한 형태의 모델들로 구성되었으나, 이러한 모델을 활용하여 복잡한 상호작용을 모의할 수 있는 통합시스템이 개발될 수 있다는 것을 보여주었다. 추후 연구에서, 보다 상세한 작물 생육 모의를 위해 기존의 과정중심의 작물 모델을 역설계하여 통합시스템을 구축하는 연구가 진행되어야 할 것으로 사료되었다.

• 한국생물환경조절학회:학술대회논문집
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• 한국생물환경조절학회 2000년도 학술발표논문집
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• pp.3-16
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• 2000

Protection agriculture is the essential choice for human to increase the efficiency of limited crop production area under harsh and changeable weather boundary conditions, extend growing season, maximize the crop yields, and then increase the sustainable income of the grower. The investment costs far greenhouses as well as labor and energy costs are much higher than for conventional plant production systems, so these can only be balanced by better crop yields, higher labor productivity, and higher energy efficiency. (omitted)

• 한국농림기상학회:학술대회논문집
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• 한국농림기상학회 2001년도 춘계 학술발표논문집
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• pp.93-96
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• 2001

Estimation of leaf wetness duration (LWD) facilitates assessment of the likelihood of outbreaks of many crop diseases. Models that estimate LWD may be more convenient and grower-friendly than measuring it with wetness sensors. Empirical models utilizing statistical procedures such as CART (Classification and Regression Tree; Gleason et al., 1994) have estimated LWD with accuracy comparable to that of electronic sensors.(omitted)

• 고려인삼학회:학술대회논문집
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• 고려인삼학회 2002년도 학술대회지
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• pp.212-226
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• 2002

North American ginseng production may have been maximized in the traditional growing areas in the last decade and further increases may be in woods grown root, for niche markets. The marketplace demands high quality roots. Most problems leading to low quality roots start with the grower and can be avoided. These include poor site selection, inadequate soil drainage, untimely and poorly applied pesticides, and neglect of good sanitary practices. Selection of low lying sites increased the plant damage from frost in Ontario in May 2002. Seeding is still the major method of propagation of ginseng in spite of some success in culturing different parts of the plant. Opportunities exist for shortening the stratification period of North American ginseng seed to allow spring planting. This may reduce disease incidence. Since only one-third of ginseng seed sown ultimately produces plants harvested after 3 years any approach that reduces disease incidence and improves seed germination, seedling emergence and crop stand must be pursued. Disease is the major problem in ginseng cutivation from seed stratification, soil preparation prior to planting, right through to drying of the roots. Replant disease remains as an unresolved problem and needs full characterization and new approaches for control. Much progress has been made in research and related extension activities in disease control although challenges will arise such as with Quintozene and its replacement with Quadris for control of diseases caused by Rhizoctonia. Decreased labor populations and increased associated costs for ginseng production are causing rapid mechanization in every aspect of the ginseng industry. Engineers, machinery dealers, and fabricators, and growers are being challenged to increase efficiency by mechanization.

• Journal of Ginseng Research
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• 제7권2호
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• pp.172-192
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• 1983

Light environment and growth of Panax ginseng In habitat and cultivation under natural shade were renewed. Grower's experiences on ginseng stand In relation to light environment were assessed. Change of shading method and grower's concepts on light requirement of ginseng plant in Korea, Manchuria and Japan was counted. Growth of wild ginseng was better under rich light. Optimum crown density index appeared to be 0.7 In natural habitat and 0.4 to 0.7 for the cultivation in forest. Change of light Intensity in forest was greatest in May and reached near to constant value (from 40% to 3% for broad leaf deciduous forest and loom 4% to 2% for pine forest). Insufficient light condition induced long and thin stem, poor flowering and seed bearing, and sequent dormancy. Relation between light and ginseng strand was not clear but light Interception with cool weather was effective. Topography and orientation of bed have been deeply considered for light environment. Panel or bark of won were used for shading in deep forest manly In Manchuria while reed blind and straw thatch were used in Korea. Kinds and number of shades material and seasonal or daily schedule have been simplified probably by labor pressure due to eulargement of plantation. Post height has been greater while width of roof, bed and ditch has changed lisle. Scientific survey in the past omitted important light control methods (complete light hardening etc) which has been practiced in specific areas. The concept and technique of light control in the past in Korea were delicate and intensive including the control of temperature and moisture. For the application of old concept in modem cultivation precise Investigation of the technique including the measurement of light, temperature and moisture is needed.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2023년도 제67차 동계학술대회논문집 31권1호
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• pp.141-144
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• 2023

현재 대한민국은 고령 사회이다. 매년 노인인구의 비율을 증가하고 있으며 2025년에는 노인인구 비율이 20%가 넘으면서 초고령사회로 접어들 전망이다. 이러한 사회적 특성으로 우리는 많은 노인 문제를 겪고 있다. 그 중 대표적인 문제는 독거노인의 비율이 증가함에 따라 매년 고독사하는 독거노인이 많아지고, 지방의 농가인구 또한 점점 감소하고 있다는 점이다. 본 논문에서는 이러한 사회문제를 해결하기 위해 Flutter를 활용한 애플리케이션 개발을 통해 식물과 IOT 기술을 접목하여 이들에게 도움을 주고자 한다. 독거노인에게는 반려 식물 시스템을 제공하여 이들의 우울증을 완화하고, 지방의 농가인구에 효과적인 스마트팜 시스템을 서비스 함으로써 이러한 사회문제를 해결하는 데 도움을 주고자 한다.

• Journal of Animal Science and Technology
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• 제44권4호
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• pp.407-418
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• 2002

Phytase 공급원으로 밀과 밀기울의 첨가가 육계 생산성 및 P이용률에 미치는 영향을 측정하기 위해 5주간의 사양 실험을 실시하였다. 갓 부화한 1,000수의 병아리(Ross$^{(R)}$)를 20pen에 50수씩(암수 각 25수) 공시하여 5처리 4반복으로 완전임의 배치하였다. T1은 대조구로 정상수준의 nonphytate-P(NPP)를 함유하였고, T2는 T1 －0.1% NPP의 低 NPP구, T3는 T2 + 사료 kg당 600IU microbial phytase(NOVO$^{(R)}$)구, T4는 T2 + 밀과 밀기울로 사료 kg당 600IU plant phytase 공급구, T5는 T2 + 밀과 수침 후 건조 처리한 밀기울로 사료 kg당 600IU plant phytase 공급구 였다. NPP 수준을 0.1% 감소시킨(T2) 처리에서 생산성과 사료효율이 감소되었고 식물성 phytase 처리시(T4와 T5)에서는 생산성이 회복되었다. 식물성 phytase 처리구들(T4와 T5)이 microbial phytase 처리구(T3)보다 더 나은 결과를 보였다. 정상 밀기울구(T4)와 수침 후 건조 처리한 밀기울구(T5)와는 차이를 보이지 않았다. 폐사율은 低  NPP(T2)에서 가장 높았다. 육성 사료에서 조지방과 조회분 이용률에 일반 밀기울 처리구(T4)가 가장 높았다. Ca과 P의 이용률 또한 T4가 가장 높고 T3와 T5가 다음으로 높았다. Phytase 처리구 (T3, T4와 T5) 들은 Mg, Fe와 Zn의 이용률을 크게 증가시켰다. Ca, P, Mg, Fe와 Zn의 배설량은 microbial phytase가 가장 적었다. 혈청내 Ca과 Mg의 함량은 低 NPP에서 가장 높았고, 경골내 조회분 함량은 T2와 T3가 T1, T4와 T5보다 낮았다. 그러나 경골내 Ca 함량은 T1과 T2가 다른 처리구들보다 높았다. 경골내 P과 Mg의 함량은 T1구가 가장 높았다. 결론적으로 밀기울을 통한 식물성 phytase의 공급은 P 이용률 향상에 효과적이었다. 수침 후 건조처리하는 것은 이용률 향상에 도움이 되지 않았다.