• The Korean Journal of Physiology
• /
• 제21권1호
• /
• pp.91-101
• /
• 1987

The present experiment was carried out, in the rabbit and cat, in order to explore functional interrelationship between the vestibular semicircular canals and extraocular muscles, which are involved in the vestibulooculomotor reflex as the receptor and effector organ respectively. Semicircular canals were subjected to electrical stimulation, lymphatic fluid flow or acute freezing, and responses of the extraocular muscles were recorded in terms of changes in electromyographic activity and isometric tension. Electrical stimulation of a unilateral canal elicited contraction of the superio-medial muscle group (superior oblique, superior rectus and medial rectus muscles) in the ipsilateral eye and the inferio-lateral muscle group (inferior oblique, inferior rectus and lateral rectus muscles) in the contralateral eye. Thus a simple and distinct axiom was found in the pattern of the reflex-response of the extraocular muscles. Inhibition of the unilateral canals elicited the extraocular muscle responses contrary to those observed by excitation of the canal. Based on the present experimental results, it was demonstrated that the functional interrelations between the semicircular canals and extraocular muscles are rather equivalent in the frontal eyed cats (with binocular vision) and lateral eyed rabbits (with monocular vision). Therefore the previous thesis that the vestibuloocular relations vary from species to species awaits experimental reevaluation.

• Fisheries and Aquatic Sciences
• /
• 제6권4호
• /
• pp.172-179
• /
• 2003

The safety of pufferfish (Lagocephalus gloveri) liver oil and the contents of some nutritional components were examined to obtain important information on their use as high valued functional foods. Pufferfish liver oil was extracted by the hot-water method using $1\%$ NaOH solution to remove toxic compounds, and then purified using a general purifying method of fish oil. Any extraordinary clinical symptoms were not observed from all groups administrated with pufferfish liver oil throughout the test period. None of the rats died when administrated the highest concentration of 10 mL/kg of the pufferfish liver oil. Vitamin A content was 114.2 ppm, as a retinal equivalent in the oil extracted using hot-water, but the content was higher (169.3 ppm) in oil extracted using n-hexane. Vitamin D and E were not detected in ppm in oil extracted using hot-water. Vitamin D in the pufferfish liver oil extracted using n-hexane was also undetected, but vitamin E was at 32.5 ppm. Among the 18 minerals detected, the sodium content was the highest at 253.5 ppm, followed by 13.9 ppm ofpotassium, 1.5 ppm of calcium, 0.2 ppm of magnesium, and other trace minerals. The contents of EPA and DHA were $0.8\%\;and\;14.8\%$, respectively, in the pufferfish liver oil extracted using hot-water. Considering these results, there is potential that pufferfish liver oil could be used as a functional food.

• 한국군사과학기술학회지
• /
• 제16권4호
• /
• pp.553-559
• /
• 2013

We make several membranes with multilayer structure and characterize protective performance in various ways. Multilayer membrane is composed of shell fabric, support membrane, functional polymer membrane and liner fabric. In this research, we apply cellulose acetate derivatives as base polymer in functional polymer membrane and characterize water resistance, water vapor permeation, protective performance against DMMP and aerosol. Test results show that cellulose based polymer with polyethyleneimine possess performance with good water vapor permeation and excellent protective capability against DMMP equivalent to Saratoga type's protective suits. Also, these materials possess aerosol protective performance and water resistance.

• Nonlinear Functional Analysis and Applications
• /
• 제28권2호
• /
• pp.497-520
• /
• 2023

Numerous problems in science and engineering defined by nonlinear functional equations can be solved by reducing them to an equivalent fixed point problem. Fixed point theory provides essential tools for solving problems arising in various branches of mathematical analysis, such as split feasibility problems, variational inequality problems, nonlinear optimization problems, equilibrium problems, complementarity problems, selection and matching problems, and problems of proving the existence of solution of integral and differential equations.The theory of fixed is known to find its applications in many fields of science and technology. For instance, the whole world has been profoundly impacted by the novel Coronavirus since 2019 and it is imperative to depict the spread of the coronavirus. Panda et al. [24] applied fractional derivatives to improve the 2019-nCoV/SARS-CoV-2 models, and by means of fixed point theory, existence and uniqueness of solutions of the models were proved. For more information on applications of fixed point theory to real life problems, authors should (see [6, 13, 24] and the references contained in).

• Journal of Microbiology and Biotechnology
• /
• 제33권10호
• /
• pp.1329-1336
• /
• 2023

Microbial fermentation is often used to improve the functionality of plant-based food materials. Herein, we investigated changes in the physicochemical and functional properties of cabbage during yeast fermentation to develop new products using fermented cabbage. Among the 8 types of food-grade yeast, both Saccharomyces cerevisiae and Saccharomyces boulardii fermented 10% cabbage powder solution (w/w) the most effectively, leaving no soluble sugars after 12 h of fermentation. In addition, the yeast fermentation of cabbage resulted in functionally positive outcomes in terms of sulforaphane content, antioxidant properties, and anti-inflammatory activity. Specifically, the yeast-fermented cabbages contained about 500% more sulforaphane. The soluble fraction (5 ㎍/ml) of yeast-fermented cabbage had no cytotoxicity in murine RAW 264.7 cells, and the radical-scavenging capacity was equivalent to 1 ㎍/ml of ascorbic acid. Moreover, cabbage fermented with S. boulardii significantly suppressed both lipopolysaccharides (LPS)-induced nitric oxide production and LPS-induced reactive oxygen species production in RAW 264.7 cells, suggesting a potential anti-inflammatory effect. These results support the idea that yeast fermentation is promising for developing functionally improved cabbage products.

• 한국안광학회지
• /
• 제14권4호
• /
• pp.45-51
• /
• 2009

목적: 본 연구는 단초점렌즈와 VDT 증후군 개선을 위해 설계된 기능성렌즈를 착용하고 4시간 동안 VDT 작업 전과 후의 임상성능과 시각적인 문제에 대하여 설문조사를 비교 분석하자 한다. 방법: 20~45세의 남 여 30명을 대상으로 단초점렌즈와 기능성렌즈(ad Plus, HANDOK OPTEC Co.)를 각각 착용시킨 후 4시간 동안 VDT 작업 전과 후의 근거리 및 원거리시력, 등가구면굴절력의 변화, 조절근점, 폭주근점, AC/A ratio, 조절용이성 등을 검사하고, 시각적인 문제에 대한 자각증상을 설문조사하였다. 결과: 단초점렌즈와 비교하여 기능성렌즈를 착용했을 때 근거리시력, 조절근점, 폭주근점, 조절용이성이 유의하게 개선되었다. 4시간 동안 VDT 작업 후의 시각적 문제점에 대한 항목의 평균 점수는 단초점렌즈에서 3.63 ${\pm}$ 0.75이고, 기능성렌즈에서 4.69 ${\pm}$ 0.83으로 기능성렌즈가 유의하게 개선된 것으로 조사되었다. 결론: 기능성렌즈가 단초점렌즈보다 4시간 동안 VDT 작업 후의 조절기능 및 시각적 문제점 개선에 도움이 되는 우수한 렌즈로 생각된다.

• 한국IT서비스학회지
• /
• 제19권4호
• /
• pp.85-107
• /
• 2020

The Internet of Things market, a technology that connects the Internet to various things, is growing day by day. Besides, various smart home services using IoT and AI (Artificial Intelligence) are being launched in homes. Related to this, existing smart home-related studies focus primarily on ICT technology, not on what service improvements should be made in customer positions. In this study, we will use smart home application customer review data to classify functional and design elements of smart home usability value and examine the ways customers think of service improvement. For this, LG Electronics and Samsung Electronics" Smart Home application, the main provider of Smart Home in Korea, customer reviews were crawled to conduct a comparative analysis between them. In this study, the review of IoT home-applications was analyzed to find service improvement insights from customer perspective, and related analysis of text mining, social network analysis and Doc2vec was used to efficiently analyze data equivalent to about 16,000 user reviews. Through this research, we hope that related companies effectively seek ways to improve smart home services that reflect customer needs and are expected to help them establish competitive strategies by identifying weaknesses and strengths among competitors.

• 한국분말재료학회지
• /
• 제16권5호
• /
• pp.336-341
• /
• 2009

To produce alloy powders with only Sm$_2$Fe$_{17}$ single phase by reduction-diffusion (R-D) method, the effect of excess samarium oxide on the preparation of Sm-Fe alloy powder during R-D heat treatment was studied. The quantity of samarium oxide was varied from 5% to 50% whereas iron and calcium were taken 0% and 200% in excess of chemical equivalent, respectively. The pellet type mixture of samarium, iron powders and calcium granulars was subjected to heat treatment at 1100$^{\circ}C$ for 5 hours. The R-D treated pellet was moved into deionized water and agitated to separate Sm-Fe alloy powders. After washing them in deionized water several times, the powders were washed with acetic acid to remove the undesired reaction products such as CaO. By these washing and acid cleaning treatment, only 0.03 wt% calcium remained in Sm-Fe alloy powders. It was also confirmed that the content of unreacted $\alpha$-Fe in Sm$_2$Fe$_{17}$ matrix gradually decreased as the percentage of samarium oxide is increased. However, there was no significant change above 40% excess samarium oxide.

• 한국정보과학회논문지:소프트웨어및응용
• /
• 제32권4호
• /
• pp.290-299
• /
• 2005

컴퓨터와 소프트웨어의 사용이 증가하면서, 프로그램 소스의 도용(표절)이 사회적인 문제로 부각되고 있다. 이런 문제를 해결하고자 프로그램의 문법 구조를 비교하여 표절을 찾아내는 방법론이 제안되었지만, 간단한 프로그램 수정에도 표절을 찾아내지 못하는 한계를 가지고 있다 이 연구에서는, 문법 구조적인 정보 뿐 아니라, 프로그램식 간의 수행시 의존 관계를 드러내는 그래프를 이용한 프로그램 표절 감지 시스템을 제안한다. 이 방법론은 문법 정보 뿐 아니라, 수행시 의존 관계까지 비교 대상에 을림으로써, 수행시 의콘 관계를 변화시키지 못하는 프로그램 수정에 대해서도 프로그램 표절을 판별할 수 있다. 또한, 이 연구에서는 표절 프로그램이란 무엇인가를 엄밀하게 정의하고 이 표절 프로그램의 정의와 연구에서 제안된 표:늰 감별 그래프와의 관계를 보였다. 즉, 두 프로그램이 표절이라는 것은 표절 감별 그래프가 일치한다는 긴과 필요 충분 관계가 있음을 증명하였다. 또한 제안된 표절 감별 방법론을 실제적인 프로그래밍 언어인 IML 에 대해서 구현하였다. 구현된 도구를 통해서 실제 표절된 프로그램들을 감별한 결과, 기존의 방법에서 찾기 어려운 프로그램 표절을 제안된 방법론이 다룰 수 있음을 확인하였다.

• 대한기계학회논문집A
• /
• 제36권8호
• /
• pp.897-904
• /
• 2012

강선설계문제는 실수형 설계변수인 형상변수와 정수형 설계변수인 강선의 개수로 이루어져 있다. 또한, 탄이 강선의 통과하는 거동을 표현하기 위하여 비선형 유한요소 해석을 사용하므로 많은 해석시간이 요구된다. 따라서, 본 연구에서는 실험계획법 기반의 효율적인 강선설계 방법을 제안한다. 첫 번째로, 3 개의 형상변수와 1 개의 정수형 변수를 포함하는 4 개의 설계변수에 대해서 보스의 직교배열표를 사용하여 25 개의 실험점을 생성한 후 각 실험점에 대해서 비선형 유한 요소 해석을 수행한다. 다음으로는 포열에서 탄이 탈출할 때의 탄의 속도와 각속도를 만족시키는 동시에 탄의 저항력을 최소화 하기 위해서 가상설계개념을 수행한다. 제안하는 가상설계개념은 설계 목적과 제약조건 그리고 효과분석을 포함하는 범함수로 생성된다. 마지막으로 가상설계개념으로부터 주어지는 새로운 설계는 초기 설계보다 나은 결과를 보여주고 있다.