• Korean Journal of Microbiology
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• v.48 no.3
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• pp.200-206
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• 2012

A bacterial strain capable of synthesizing polyhydroxyalkanoates (PHAs) with an unusual pattern of monomer units was isolated from activated sludge using the enrichment culture technique. The organism, identified as Pseudomonas aeruginosa P-5, produced polyesters consisting of 3-hydroxyvalerate and medium-chain-length (MCL) 3-hydroxyalkanoate monomer units when $C_{-odd}$ alkanoic acids such as nonanoic acid and heptanoic acid were fed as the sole carbon source. Solvent fractionation experiments using chloroform and hexane revealed that the 3-hydroxyalkanoate monomer units in these polyesters were copolymerized. The molar concentration of 3-hydroxyvalerate in the polyesters produced were significantly elevated up to 26 mol% by adding 1.0 g/L valeric acid as the cosubstrate. These copolyesters were sticky with low degrees of crystallinity. The PHA synthase genes were cloned, and the deduced amino acid sequences were determined. P. aeruginosa P-5 possessed genes encoding MCL-PHA synthases (PhaC1 and PhaC2) but lacked the short-chain-length PHA synthase gene, suggesting that the MCL-PHA synthases from P. aeruginosa P-5 are uniquely active for polymerizing (R)-3-hydroxyvaleryl-CoA as well as MCL (R)-3-hydroxyacyl-CoAs.

• Survey Research
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• v.7 no.2
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• pp.53-69
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• 2006

Weights can be made and imposed in both sample design stage and analysis stage in a sample survey. While in design stage weights are related with sample data acquisition quantities such as sample selection probability and response rate, in analysis stage weights are connected with external quantities, for instance population quantities and some auxiliary information. The final weight is the product of all weights in both stage. In the present paper, we focus on the weight in analysis stage and investigate the effect of such weights imposed on the weighted mean when estimating the population mean. We consider a finite population with a pair of fixed survey value and weight in each unit, and suppose equal selection probability designs. Under the condition we derive the formulas of the bias as well as mean square error of the weighted mean and show that the weighted mean is biased and the direction and amount of the bias can be explained by the correlation between survey variate and weight: if the correlation coefficient is positive, then the weighted mein over-estimates the population mean, on the other hand, if negative, then under-estimates. Also the magnitude of bias is getting larger when the correlation coefficient is getting greater. In addition to theoretical derivation about the weighted mean, we conduct a simulation study to show quantities of the bias and mean square errors numerically. In the simulation, nine weights having correlation coefficient with survey variate from -0.2 to 0.6 are generated and four sample sizes from 100 to 400 are considered and then biases and mean square errors are calculated in each case. As a result, in the case or 400 sample size and 0.55 correlation coefficient, the amount or squared bias of the weighted mean occupies up to 82% among mean square error, which says the weighted mean might be biased very seriously in some cases.

• Food Industry
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• s.181
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• pp.68-91
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• 2004

조미료란 식품을 조리, 가공, 섭취할 때 맛을 증진시키거나 강화시킬 목적으로 사용되는 물질을 일컫는다. 발효, 종합 및 천연계 조미료의 국내외 시장동향에 대해 살펴보고, 조미료의 향후 발전방향과 중점 연구 분야, 관련업계의 연구개발 동향에 대한 고찰을 토대로 조미료 분야의 고부가가치 산업으로의 육성방안에 대해 알아보았다. 미원, 아이미 등으로 대표되는 발효조미료의 내수시장은 성숙기를 거쳐 소폭 감소세를 보이는 쇠퇴기에 접어들고 있다. 이는 소비자의 MSG에 대한 기피현상이 주 원인으로 판단된다. 전반적으로 품질 차별화 없이 가격 경쟁이 심화되고 있는 실정이다. 국내 종합조미료 시장은 1975년 국내에 처음으로 CJ에서 다시다 제품을 출시한 후 대상에서 1982년 맛나, 1988년 감치미를 출시하면서 30여 년간 지속적으로 성장해 왔다. 현재 시장규모는 2천억원에 이르고 있으며 최근 들어서는 성장세가 완만해지고 있고 가정용은 거의 정체되어 있다. 일본 조미료 시장은 발효조미료, 종합조미료 그리고 다양한 조미식품의 소재로 활용되는 천연조미료로 구분할 수 있다. 발효조미료 시장은 국내와 비슷한 상황으로 전체적인 물량변화는 약간 감소하는 경향이며 생산기지의 해외이전 현상이 뚜렷하다. 종합조미료 시장은 한국과 유사한 풍미조미료 외에도 보다 전문화되고 다양한 형태의 조미료가 시판되고 있으며, 전통적인 풍미조미료는 정체현상을 보이고 건강지향, 전용화 조미료가 호조를 보이고 있다. 일본과 한국의 조미료 발전 단계는 조금 차이를 보이고 있다. 현재 한국은 종합조미료 시대에서 용도별 조미료 시대로 넘어가는 단계에 있는 반면, 일본은 이미 메뉴 전용 조미료시대에 접어들었고, 건강, 기능성을 강조하는 시대로 나아가고 있다. 이들 변화는 건강에 대한 소비자의 관심과 그로 인한 보다 천연에 가까운 조미소재에 대한 수요, 동시에 맛에 대한 충족까지 요구하는 시대적 변화에 따른 필연적 결과로 보인다. 미래의 조미료는 천연계 소재의 사용량이 증가할 것이고, 소비자의 건강, 안전 추구심리에 부흥하여 안전성과 기능성을 부여하는 소재에 관심이 집중될 것으로 보인다. 더불어 전반적인 생활수준 향상에 따라 제품의 고급화와 전용화도 진행될 것으로 보인다. 향후 조미료시장을 주도할 각 현상에 대해 좀더 자세히 알아보고 학계 및 업체의 최근 연구동향과 제품개발 현황에 대해 고찰해 보았다. 기술연구 동향을 보면, 나노 기술에 의한 조미신소재연구, 초미분쇄기술, 미세 캡슐화 기술, 생물공학 기술이 활용된 발효 및 효소분해에 의한 펩타이드계 조미소재 개발 등이 활발하게 진행되고 있다. 선진업체 연구 및 제품개발 동향은 아지노모트/교와의 ''코쿠미''계 조미소재 연구개발, 일연푸드/동해물산의 천연 엑기스계 조미소재 연구개발, 보조주(주)의 주류 조미료 개발 위주로 살펴보았다. 조미료 시장의 발전 과정과 선진 업체들의 연구, 개발동향을 종합해 보면 첫째는 천연 건강지향에 부응하는 차별화된 소재 및 기능성 소재 개발이고 둘째는 맛과 편리함의 추구에 대응하는 메뉴 전용화 추세이다. 이를 위한 기술적 연구도 기능성 소재(히스티딘 함유 디펩타이드)개발, 나노기술, 미세캡슐화 기술 등을 통하여 다양하게 진행되고 있다. 조미료 산업을 첨단 고부가가치 산업으로 육성하기 위해서는 R&D 투자확대와 효율성을 제고하는 것이 필수적이다. 각 기업단위에서는 장기적 차원에서 첨단식품 기반기술에 대한 연구를 수행하거나, 전문 중소기업, 벤처를 육성하는데 지원해야 한다. 그러나 현실은 당장의 수익과 회사간 경쟁으로 인해 장기적 투자, 사회적 인프라 육성 등에는 관심을 쏟지 않고 있다. 조미료를 비롯한 식품에 관련된 기술들이 다양한 기초연구와 응용기술, 개발연구 등의 총합인 경우가 많기 때문에 이들 상이한 연구 분야간의 연계를 강화하고 개발된 기술의 이전, 확산체계를 구축할 필요가 있다. 이를 위해 기업간 수평적 네트워크 외에도 국가기관이 참여하는 연구 자원의 효율적 집행 기관이 필요하리라 본다.

• Journal of the Korean association of regional geographers
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• v.22 no.1
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• pp.36-48
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• 2016

This paper analyzed the process of modernization in terms of the social structure in Geomundo. Before modernization, social structure in Geomundo was traditional society by a village unit. A village had community rituals and organization. There were independent parallel spatial structure among villages. In the early Japanese colonial period, 'forced modernization' had been occurred by Japanese immigrants settling in a separate living space. The modernization was transplanted in a new established village and diffused into other villages. In the process of forced modernization, the connection among villages was reinforced, as the result of that modern social organization was emerged, and the characteristics of community rituals had been changed. During modernization indigenization period, advanced fishery technology and distribution system occurred capitalist production system helping to place modern norms in the general daily life. In the late Japanese colonial period, aided organizations from local government and informal organizations reversed the trend of modernization through helping colonial exploitation policy. The spatial structure in Geomundo had become to hierarchical structure with intensified connectivity as the result of extensive spread of community territory. Modernization in Japanese colonial period was 'forced modernization' and could not re-established the community spirits. The community spirit has been broken up by dissolving the existing self regulating and self motivated organization.

• The Journal of the Korean dental association
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• v.48 no.4
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• pp.280-287
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• 2010

Objective: In spite of increasing dental treatment for the disabled, there was a few collected data on dental treatment status and dentists' perception in Korea. The purpose of this' study is to research the current dental treatment status for the disabled in Korea and to suggest public health policies for the disabled. Material and methods: Total of 68 dentists who have treated the disabled regularly were asked to fill questionnaires regarding dental treatments for the disabled. Results: 1. It is necessary to set up public dental center for the disabled in rural area. 2. In case of dental treatments relating to cerebral palsy, ADHD, autism, the compensation for treatment time and extra investment is needed. 3. Only 39.7% of dentists charged treatment fees to the disabled as same as normal patients. Moreover 38.2% of dentists answered that they didn't charge treatment fees at all when their patient are disabled. 4.23.5% of dentists provided all of dental treatments including dental implant and orthodontic appliances in Korea. However, 54.3% of dentists reported the improvement of access to dental implant, orthodontic and esthetic treatment is needed. 5. It is imperative for the government to improve the support system for the disabled. Conclusions: Through this research only 26.5% of dentists answered that they had received the fund from the government and 11.1% of them were satisfied with the support for the disabled in Korea. This indicated the improvement of government financial support system for the disabled is needed.

• 대한공업교육학회지
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• v.44 no.2
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• pp.123-141
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• 2019

The purpose of this study is to provide basic data that can be used for the development of technology textbooks of Nigeria-Korea Model School by analyzing external and internal aspects of Illustration in Nigerian primary school technology textbooks, and 10 textbooks used in Nigeria were analyzed. Based on the results of the study, the conclusions are as follows. First, the form of the visual data should be diversified into a picture, a cartoon, a diagram, and a diagram from the photograph center, and provide various information closely related to the contents of the technology. Second, it is necessary to increase the size of illustration so as to induce learners to be motivated, and to enhance the effect of editing. Third, currently, partial enlargement data is rarely used, but visual material should be partially enlarged in order to express a detail part of product. Fourth, diversity of editing should be done by using circular or background omission rather than using only rectangle uniformly in visual material. Fifth, in terms of gender equality, it is necessary to deviate from male-centric visual materials and edit them with consideration for women. Sixth, in order to provide learner-centered textbooks, the role of visual materials should be extended to 'inducement of motivation', 'activity guidance', and 'activity result' in addition to 'providing data'. Finally, in terms of the function of visuals, the quality of textbooks should be upgraded by utilizing auxiliary and decorative functions in addition to essential functions.

• Radiation Oncology Journal
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• v.7 no.2
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• pp.305-311
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• 1989

Fletcher-Suit colpostat has an internal structure to reduce dose to bladder and rectum. Some programs were developed to calculate dose at any point in water in three dimension around the colpostat containing Cs-137 tube, to find the shielding effect to dose by the internal structure, and to draw isodose curves and iso-shielding effect curves. Computer was an IBM compatible AT with EGA card and language was MS-Basic V6.0, Material, shape and geometry of the strucure, tube and colpostat were considered in algorithm for calculation of dose. Dose rates per unit mg. Ra. eq. in water calculated by a program were stored in auxiliary memory devices and retrieved in another programs. Isodose curves on medial side shrinked. Dose distribution was not symmetric about a transverse axis bisecting the colpostat. Reduction of dose was more excessive on top side than on bottom. Iso-shielding effect curve showed that the shielding effect was higher on top side than on bottom, and that there was shielding effect over almost all area of medial side. Such results were related to both shifted position of tube in the colpostat and asymmetric distribution of active source in the tube. Maximum of shielding effect was $49\%$ on top side and $44\%$ on bottom side. The direction of iso-shielding effect curve was generally radial from the center of active source. In treatment planning using Fletcher-Suit colpostat, the internal structure should be considered to find precise doses to bladder and rectum, etc.

• Journal of Korean Society of Forest Science
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• v.100 no.1
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• pp.70-78
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• 2011

In this study, we develop a fire stochastic simulation model by season based on the historical fire data in Korea. The model is utilized to generate sequences of fire events that are consistent with Korean fire history. We employ a three-stage approach. First, a random draw from a Bernoulli distribution is used to determine if any fire occurs for each day of a simulated fire season. Second, if a fire does occur, a random draw from a geometric multiplicity distribution determines their number. Last, ignition times for each fire are randomly drawn from a Poisson distribution. This specific distributional forms are chosen after analysis of Korean historical fire data. Maximum Likelihood Estimation (MLE) is used to estimate the primary parameters of the stochastic models. Fire sequences generated with the model appear to follow historical patterns with respect to diurnal distribution and total number of fires per year. We expect that the results of this study will assist a fire manager for planning fire suppression policies and suppression resource allocations.

• Korean Journal of Child Care and Education Policy
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• v.12 no.3
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• pp.3-27
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• 2018

The purposes of this study were to examine a tendency of kindergarten teachers' daily work performance and to explore their perceptions on the reality and efficiency of working hours. 273 public and private kindergarten teachers completed questionnaires. The findings of the study are as follows. First, kindergarten teachers carried out an average of 1.41 duties per a 30-minute segment, and there were some differences in their duties between public and private teachers. Second, as a key reason of their lack of preparation time for class, public teachers indicated much administrative work, whereas private teachers indicated many events and common work. In addition, for the work duties that require supporting staff, public teachers pointed out clerical work, whereas private teachers named event-related duties. Third, in terms of efficiency of their working hours, both public and private teachers highlighted excessive workload as a key obstacle; public teachers also indicated the shortage of supporting staff, while private teachers indicated many event-related duties and lack of directors' leadership. These findings imply that it is important to maintain an optimum level of workload for kindergarten teachers, to secure preparation time for class, to increase work efficiency, and to provide support specific to kindergarten types.

• KIPS Transactions on Software and Data Engineering
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• v.11 no.7
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• pp.291-298
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• 2022

In this paper, we present a method for dependency parsing with chunking in Korean. Dependency parsing is a task of determining a governor of every word in a sentence. In general, we used to determine the syntactic governor in Korean and should transform the syntactic structure into semantic structure for further processing like semantic analysis in natural language processing. There is a notorious problem to determine whether syntactic or semantic governor. For example, the syntactic governor of the word "먹고 (eat)" in the sentence "밥을 먹고 싶다 (would like to eat)" is "싶다 (would like to)", which is an auxiliary verb and therefore can not be a semantic governor. In order to mitigate this somewhat, we propose a Korean dependency parsing after chunking, which is a process of segmenting a sentence into constituents. A constituent is a word or a group of words that function as a single unit within a dependency structure and is called a chunk in this paper. Compared to traditional dependency parsing, there are some advantage of the proposed method: (1) The number of input units in parsing can be reduced and then the parsing speed could be faster. (2) The effectiveness of parsing can be improved by considering the relation between two head words in chunks. Through experiments for Sejong dependency corpus, we have shown that the USA and LAS of the proposed method are 86.48% and 84.56%, respectively and the number of input units is reduced by about 22%p.