• 한국전자통신학회논문지
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• 제12권4호
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• pp.539-544
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• 2017

본 논문에서는 휴먼 카운팅 시스템을 위한 광대역 패치 안테나가 공기 유전체 층을 이용하여 설계, 제작 및 측정되었다. 제안된 안테나는 5 mm의 공기 유전체 위에 정사각형 구조의 패치 구조를 가지며, CPW 전송선로 구조의 입력부와 패치면의 수직 연결은 계단형 임피던스 구조로 구현하였다. 3차원 EM 설계를 통해 최적화된 광대역 패치 안테나는 16.6 * 16.6 * 5.0 mm3의 크기로 3D 프린터를 이용하여 안테나 지그를 제작하여 지그 위에 제작되었다. 제작된 안테나는 7.2 ~ 9.8 GHz 주파수에서 2:1 이하의 VSWR과 5.71 dBi의 최대 이득을 가지며, $70^{\circ}$의 반전력 빔폭 특성을 나타내었다.

• 한국전자파학회논문지
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• 제26권9호
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• pp.814-820
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• 2015

본 논문에서는 두 단락 스터브를 갖는 이중 모드 링 공진기를 이용하여 높은 신호 선택도를 가지는 이중대역 대역통과 필터를 제안하였다. 링 공진기의 이중 모드 공진을 위하여 두 피드 라인을 커플링 커패시터를 통해 비직교 급전 각도를 가지도록 연결하였다. 서로 다른 두 길이를 가지는 두 단락 스터브를 링 공진기의 두 대칭면에 위치시킴으로써 이중 대역을 지원하는 여파기를 설계할 수 있었다. 급전 각도 섭동을 준 링 공진기와 제안한 이중대역 대역통과 필터는 대칭 구조이므로 Even/Odd 모드 해석을 통하여 산란계수와 전송 영점 주파수들을 도출할 수 있다. 제안한 이중대역 대역통과 필터는 IEEE 802.11n 기준의 WLAN 어플리케이션에 적용 가능하도록 설계 및 제작되었다. 측정 결과와 시뮬레이션 결과가 잘 부합하였고, WLAN 응용뿐만 아니라, 향후 다른 통신시스템에도 적용이 가능하리라 판단된다.

• 대한가정학회지
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• 제44권12호
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• pp.9-18
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• 2006

A case study was conducted on the development of patient clothes designs at the Korea University Medical Center, in order to provide an example of patient clothes designs which meet the hospital identity and the demands of patients and nurses. In this study, we focused on general patient pajamas and one-piece gowns worn in the obstetrics and gynecology department. A scientific and systematic design approach consisting of the following four steps was conducted in the designing process: needs assessment, design direction establishment, design presentation, and final decision. For the first step, focused group interviews and a survey were conducted to identify the needs of the patients and nurses. According to the results of the first step, 3 fabric patterns with light, modern, rhythmic, modest and ordinary images were designed utilizing the university and hospital symbols and logotypes. Fixed forms with realistic and geometric characteristics and colors, including white, yellow, blue, grey, and pink were selected to deliver the preferred image. Each fabric pattern was made in male and female versions of the color sets. The following styles of patient clothes were made with the 3 fabric samples: general patient pajamas with a U-neckline, 9/10-length sleeves and ankle-length pants, a full-length sleeved gown with openings for breast-feeding, and a gown with a deep back-neckline and button fastening. Different sizing systems for males and females were recommended for the production.

• Asian-Australasian Journal of Animal Sciences
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• 제23권6호
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• pp.825-832
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• 2010

The United Nations Convention on Biological Diversity defines biotechnology as "Any technological application that uses biological systems, dead organisms, or derivatives thereof, to make or modify products or processes for specific use" Biotechnology has made tremendous contributions to improve production efficiency of agriculture during the last century. This article reviews successful examples of application of bio-fermentation in improving swine nutrition efficiency mainly based on the authors'z own research experience. Production of feed grade supplemental amino acids by bio-fermentation allowed nutritionists to formulate accurate feed for optimal lean growth and reduced nitrogen excretion. Recent issues with high feed grain prices caused potential feed quality problems. Bio-fermentation allowed nutritionists to use exogenous supplemental enzymes such as phytase and NSPases in swine diets, thereby improving nutrient utilization and reducing nutrient excretion to the environment. Yeast metabolites are also produced by bio-fermentation and have been repeatedly shown to improve milk production of sows during early lactation even though actual mechanisms are still to be investigated. Bio-fermentation technology also allowed nutritionists to prepare vegetable protein sources with large protein molecules and anti-nutritional factors suitable for feeding newly weaned piglets, as selected microorganisms significantly reduce specific anti-nutritional factors and size of peptides. Preparations of vegetable protein sources suitable for newly weaned pigs will greatly contribute to swine nutrition by providing efficient alternatives to the use of animal protein sources that are often expensive and somewhat against societal preference. Considering the few examples listed above, biotechnology has closely influenced improvement of production efficiency in the swine industry. As we have limited resources to produce meat to satisfy ever-increasing global demands, extensive adaptation of biotechnology to enhance production efficiency should be continued. However, at the same time, wise and careful application of bio-technology should be considered to ensure production of safe food and to meet the expectations of our society.

• 한국임상수의학회지
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• 제27권4호
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• pp.378-381
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• 2010

The objectives in the present study were to evaluate the therapeutic effect of dioctahedral smectite (smectite) against piglet diarrhea caused by E. coli and Salmonella. Of this study, twenty piglets (body weight, $6.60{\pm}0.34\;kg$) with diarrhea were used to estimate the efficacy of smectite on piglet diarrhea with 20% smectite suspension in PBS. Pigs were administered with 1 ml smectite suspension three times a day after feeding, and fecal samples were collected at the gate of treatment and on 1st, 2nd, 3rd, and 4th day after administration. Changes in body weight, diarrhea index, and shedding of E. coli and Salmonella were monitored during the experimental period. The group treated with smectite reduced diarrhea index (p < 0.01), and increased body weight compared to control group. In the treated group, the number of E. coli and Salmonella was significantly decreased compared to each control group (p < 0.01). From results of the present study, 20% smectite suspension had therapeutic effect on diarrhea caused by E. coli and Salmonella in piglets.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권10호
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• pp.3941-3954
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• 2020

In this paper, the climate change in Haiyan County in recent decades was analyzed in detail with the methods of moving average, Mann-Kendall non-parametric mutation test and wavelet analysis. According to the variation trend of meteorological factors such as temperature, relative humidity, wind speed, pan evaporation and precipitation in recent decades, the climate of Haiyan County has a tendency of drought, which is becoming more and more serious. From the results of the analysis, the sunshine hours and the air temperature in Haiyan County have an obvious upward trend. The average surface temperature has increased by 2.75 ℃ from 1976, and its largest increase occurred in the late 1970s and 1980s. At this stage, the average surface temperature increased by 1.37 ℃. The relative humidity has a decreasing trend that has decreased by 2.75％. From 1976 to the present, there are two quasi-3a cycles and one quasi-6a cycle. The precipitation and evaporation showed the opposite change trend, in which the trend of precipitation fluctuated upward, while the trend of evaporation showed a fluctuating downward tendency, which led to the serious loss of water in the feeding area. The wind direction in Haiyan County are mainly from west to east, and its wind speed has a trend of slight increase.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1998년도 21세기 한반도 농업전망과 대책(한국작물학회.한국육종학회 공동주관 심포지움 회보)
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• pp.68-111
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• 1998

The structure of the Hanwoo (Korean Native Cattle) Industry remains very weak and vulnerable to the WTO/IMF system. Considering that the majority of cattle farmers are small sized, and that marketing systems are outdated and inefficient, rapid expansion of lower priced beef imports by WTO system and rapid increasing of production costs by IMF system would lead to the deprivation of a regular source of farm income and threaten the stability of rural life. Accordingly, the Hanwoo industry should be expanded in accordance with progress in the implementation of (1) programs for the structural adjustment and (2) measures to compensate for the loss. Efforts for lowering major production factor costs needs to continue, In order to increase the supply of calves at low cost, the programs of collective cow-calf farms should be expanded, thereby reducing the cost of calf purchase, which constitutes the largest share of Hanwoo production cost. Also, feedlot operations should be encouraged for small herd farms in order to achieve a substantial saving in beef production costs by integrated operations from calf production to cattle fattening. A substantial saving would also be made by collective purchase and distribution of various inputs through the cooperatives' channels. Extension services should be strengthened for cattle farm management, cattle care and feeding, prevention of cattle disease, etc. In order to minimize cash outlays for commercial mixed feeds, utilization of far by-products as feeds should be enhanced and production of forage crops productive of resources, such as land and rural labor, during the farm o(f-season, needs to be encouraged. Also, technological development for enhancing the nutritional value of farm by-products should be encouraged. Measures for successful segregation of the Hanwoo beef market should be implemented, thereby enhancing incentive for quality beef producers and protecting consumers willing to pay higher price for quality beef. For development of the Hanwoo industry, a considerable time frame would be required in order for (1) small livestock farmers to make a successful adjustment by staying in the enterprise and achieving increased price efficiency (2) livestock farmers to acquire know-how for producing quality Hanwoo beef, (3) the ongoing Government policy of enhancing price-quality competitiveness, and for improving the quality Hanwoo beef marketing to take root. (4) consumers to increase their ability to distinguish meat quality, and others.

• Journal of Genetic Medicine
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• 제18권1호
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• pp.64-69
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• 2021

Primary cilium has a signal transduction function that is essential for brain development, and also determines cell polarity and acts as a mediator for important signaling systems, especially the Sonic Hedgehog (SHH) pathway. TBC1D32 is a ciliary protein, implicated in SHH signaling. Biallelic mutations in the TBC1D32 gene causes a kind of ciliopathy, heterogeneous developmental or degenerative disorders that affect multiple organs, including the brain. Here we report a boy who carried compound heterozygous variants in TBC1D32. The patient showed hypotonia, respiratory difficulty, and multiple anomalies at his birth. He was diagnosed with congenital hypopituitarism and treated with T4, hydrocortisone, and growth hormone. Despite the hormonal replacement, the patient needed long-term respiratory support with tracheostomy and nutritional support with a feeding tube. His developmental milestones were severely retarded. Hydrocephalus and strabismus developed and both required surgery, during the outpatient follow-up. Whole-exome sequencing indicated compound heterozygous variants, c.2200C>T (p.Arg734^*) and c.156-1G>T, in TBC1D32 gene. This is the first Korean case of TBC1D32-related ciliopathy and we reported detailed and sequential clinical features. This case demonstrated the utility of whole-exome sequencing and provided valuable clinical data on ultra-rare disease.

• 공업화학
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• 제33권4호
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• pp.335-342
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• 2022

화석연료 사용 비중이 큰 농업분야에서는 최근 불안한 국제정제와 맞물린 에너지 가격 상승과 활발한 스마트팜 보급으로 전력사용량까지 증가하는 에너지 사용 패턴 변화로 새로운 국면을 맞고 있다. 따라서 친환경 분산형 전원으로 연료전지를 이용하며, 바이오매스를 직접 연료로 사용할 수 있는 연료전지 열병합발전 시스템은 농가에 열 및 전기에너지를 동시에 공급할 수 있는 효과적인 에너지시스템으로 인식되고 있다. 본 총설 논문에서는 바이오매스, 특히 농업부산물을 연료로 활용하기 위한 연료전지 기반의 열병합발전 시스템에 대한 공정 구성과 기술적 동향을 제시하고, 통합 연계공정 설계 시 고려해야 할 부분들을 논의하고자 한다.

• 한국축산식품학회지
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• 제42권1호
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• pp.128-141
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• 2022

Compared to the conventional farms (CF) rearing of broilers, the rearing management of animal welfare-certified farms (AF) must provide low stocking density, perch, air regulation, and feeding plant-based protein. This study aimed to compare the effects of rearing management in CF and AF on blood parameters, meat quality, and bioactive compound content in Ross 308 broiler chickens at the farm level before transportation to slaughterhouses. Blood and meat samples were obtained at 28-35-dayold chickens from three CF and three AF. In blood samples, low-density lipoprotein cholesterol (p<0.05), triglyceride (p<0.001), glucose (p<0.01), total protein (p<0.001), albumin (p<0.01), and white blood cell (p<0.001) levels as well as the heterophil/ lymphocyte ratio [stress index (SI), p<0.001] were lower in broilers from AF than in CF. In meat samples, shear force (p<0.001, p<0.05), and carnosine contents (p<0.001, p<0.05) in both breast and thigh meat from AF were higher than those in meat from CF. The contents of linoleic acid (p<0.001), α-linolenic acid (p<0.001), and eicosapentaenoic acid (p<0.05) were higher in the samples from AF than those from CF. This study reveals that such differences are influenced by the different rearing factors in nutrition, housing, and management practices between CF and AF. Supplementation of plant-based protein and enough space to move due to lower stocking density accounts for the large differences between them. These results can be used as preliminary data showing that the AF system reduces the SI and enhances carnosine and polyunsaturated fatty acids levels in chicken meat at the farm level before transportation.