• Journal of Chest Surgery
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• v.22 no.1
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• pp.134-140
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• 1989

A clinical evaluation was made on total 207 cases of corrosive esophageal stricture after ingestion of various corrosive substances and 173 cases of neoplasms in the esophagus and the cardia. The various complications associated with esophageal corrosion were observed on 28 cases [13.5%] in a total of 207 cases. Pathoanatomic findings of complication may be classified to the five category as follow; [1] stenosis in the pharynx due to adhesion of the epiglottis, [2] esophagobronchial fistula, [3] esophageal perforation with bougienation, [4] necrotic rupture of the esophagus and the stomach, and [5] so-called chronic corrosive gastritis. The comparative studies were done on a total of 165 cases of the various procedures of esophagoplasty to the reconstruction of the esophagus, which consists of antethoracal esophagoplasty with jejunum, retrosternal esophagoplasty with jejunum, retrosternal esophagoplasty with right colon, and retrosternal esophagoplasty with left colon. There is no hard and fast rule in selection of jejunum, right colon or left colon as the transplanting bowel and an operative method either antethoracal or retrosternal approach. When there was no possibility of the complication and no any defect of the anatomical states, one stage retrosternal esophagoplasty using right colon was better in various points of view. The 173 patients of the neoplasm of the esophagus consist of 28 cases of benign tumors and 145 cases of malignant tumors in the esophagus and cardia. 28 cases of benign tumors in the esophagus received the surgical treatment and they obtained with excellent results postoperatively. Of the 145 patients of esophageal carcinoma who received surgical managements, 101 cases [69.6%] were found to be operable and 44 cases [30.3%] were inoperable. Due to the various level of carcinoma in the esophagus, the following different surgical procedure was properly used case by case to get the best results in each case. Esophageal carcinoma in the upper and middle third segment received the total esophagectomy and the reconstruction of the esophagus using right colon by substernal procedure. Esophageal carcinoma in the lower third segment received an esophagojejunostomy in the mediastinum after the resection of lower third segment of the esophagus. Carcinoma in the esophago cardia and the stomach received also an esophagojejunostomy after the resection of the lower third segment of the esophagus and subtotal gastrectomy. For the 44 patients with inoperable carcinoma, the several palliative surgical managements such as gastrostomy or jejunostomy for feeding and esophagojejunostomy for bypass of the lower esophagus and the stomach were properly performed case by case for their maximum improvement.

• The Journal of the Korea Contents Association
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• v.13 no.2
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• pp.19-31
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• 2013

Since the high readable source codes help us to understand and modify the program, it is much easy to maintain them. The readability of source code is not only affected by the complexity of algorithms such as control structures but also affected by the coding styles such as naming and indentation. Although various coding standards have been presented for promoting the readability of source codes, it has been usually lost or ignored in a programming course. One of the reasons is that the coding standard is not a hard-and-false rule since it does not contribute to the performance of software. In this paper, we propose a simple automatic system, namely StyleJigsaw, which checks the style of the source codes written by C/C++ or Java. In this system, the coding style score is calculated and visualized as a jigsaw puzzle. To measure the educational effectiveness of StyleJigsaw, several experiments have been conducted on a class students in C++ programming course. According to the experimental results, the coding style score increased about 8.0 points(10.9%) on average using StyleJigsaw. Further, according to a questionnaire survey targeting the students who attended the programming course, about 88.5% of the students responded that StyleJigsaw was of help to learn the coding standards. We expect that the StyleJigsaw can be effectively used to encourage the students to obey the coding standards, resulting in high readable programs.

• Ecology and Resilient Infrastructure
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• v.6 no.4
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• pp.250-257
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• 2019

Recently, 357 water-friendly space were established near the main streams of the country through the Four Major Rivers Project, which was used as a resting and leisure space for the citizens, and the river environment and ecological health were improved. We are working hard to reduce the number of points and plan and manage the water-friendly space. In particular, attempts are being made to utilize mobile big data to make more scientific and systematic research on the number of users. However, when using mobile big data compared to the existing method of conducting field surveys, it is possible to easily identify spatial user movement patterns, but it is different from the actual amount of use, so various verifications are required to solve this problem. Therefore, this study evaluated the accuracy of estimating the number of users using mobile big data by comparing the number of visitors using mobile big data and the number of visitors using drone for Samrak ecological park located in the mouth of Nakdong River. As a result, in the river hydrophilic district, it was difficult to accurately estimating the usage pattern of each facility due to the low precision of pCELL, and it was confirmed that the usage patterns in the park could be distorted due to the signals stopped at roads and parking lots. Therefore, it is necessary to improve the number of pCELLs in the water-friendly space and to estimate the number of visitors excluding facilities such as roads and parking lots in future mobile big data processing.

• Journal of Educational Research in Mathematics
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• v.19 no.1
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• pp.63-80
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• 2009

This paper has a purpose to find out the important points about linguistic factors suited to the assessment purpose and mathematics teaching/learning that a word-problem sentence has to possess. We also examine the degree of understanding of sentence and the perceptive/emotional reactions of students toward two different kinds of word-problem sentences that have same mathematical contents, but different linguistic structures. The objects of this thesis are 124 students from the third to sixth grade in an elementary school. We execute assessment of simple-sentence-word-problem and complex-sentence-word-problem that have same mathematical contexts, but different linguistic structures. Then we have compared and examined their own process of solving the two types word-problems and we make up questionnaire and have an interview with them. The conclusions are as followings: First, simple-sentence-word-problem is more successful to suggest an information for solving a problem than complex one. Second, it is hard to find the strategy for solving a problem in complex-sentence-word-problem than simple one. Third, students think that suggested information and mathematical knowledge are different according to the linguistic structure in the process of perceiving the information after reading a word-problem. Fourth, in spite of same sentence type, the negative mental reaction is showed greatly to complex-sentence-word-problem even before solving a problem.

• Lingua Humanitatis
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• v.1 no.1
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• pp.141-157
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• 2001

In his discussion of some desirable tuning points in comparative literary studies, Henry H. H. Remark has emphasized the importance of literary approach to other forms of art. Understanding the significance of such a method of comparative literature, the present study focusses on three contemporary Korean poets who have transferred Mark Chagall′s paintings into their poetry: Youngtae Kim, Chunsoo Kim, and Sunghun Lee. They are usually evaluated as surrealist/modernist in our literary circles. In transforming Chagall′s paintings into his poems, Youngtae Kim has incorporated a variety of surrealist mosaic techniques such as montage and collage. The resultant peculiarity of his poetry makes it hard to lay bare the correspondence or similarities between his poetic world and the world of Chagall′s artistry. It is nonetheless possible to see how Kim, as a poet and painter, had interpreted Chagall′s world with a bird′s-eye view of it. Chunsoo Kim′s "Snow Falling on the Village of Chagall" relates specially to one of Chagall′s paintings, "I and My Village." The present study has taken notice of this correlation in sorting out some basic elements of poetic transfiguration. One of the techniques employed in the poem under discussion is that of juxtaposing the Russian village of Chagall and the Korean village the poet visualizes, with the effect of putting two national traditions in contrast. A reading of the poem reveals that it is not so much the result of a detailed analysis of the painting as a revival of its lingering impression as a whole. In Sunghun Lee′s poetry, surrealist techniques are again a hallmark. But his method of transferring the images of the paintings into his poems falls somewhere between those of Youngtae Kim′s and Chunsoo Kim′s: it is akin to the ′bird′s-eye method′ of the former and shares the impressionistic touch with the latter, but at the same time Lee is analytical by disposition and opts for concrete descriptions. ′Love,′ ′farm,′ and ′time′ are the keywords that are brought under discussion in the present study. There is a growing demand in the current international comparative literary studies for broadening the area of comparative literature. This study hopes to be a small contribution to endorsing the importance of comparative approach to fine arts.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.5 no.1
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• pp.28-35
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• 1994

Research on biological aspects on adult depression has been subjected to more than 25 years of systematic research, while biologic investigations regarding childhood and adolescent depression are only now being initiated. Although no unifying, explanatory theory of the biologic etiology of childhood depression emerges from the results of studies reviewed above, the findings do support that biological factors may be involved in the genesis of childhood depression. The research reviewed in this paper suggests that age and pubertal factors have major effects in most biological markers of depression. Some of these markers, like sleep EEG and neuroendocrine markers should be broken down by decades during adult life span. Thus, although adult data are very valuable points of departure for biological research on child and adolescent depression, it is very hard to transfer the adult data to prepubertal children and adolescents, ignoring the biological changes that take place in growth and development, pubety and aging. A great deal of work in basic developmental neuroscience remains to be done. It will be crucial for further advances in this field to determine the normal patterns of neurotransmitter interaction in this age group and to study children at high risk for depression. It will be also crucial to use primate models of depressive illness in order to be able to answer the many queations that cannot be investigated in humans for ethical issues. Conclusively, much closer collaboration between developmental and neurobiological and behavioral studies in primates and in humans will be essential for further development.

• Journal of Korean Society of Forest Science
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• v.89 no.3
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• pp.397-404
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• 2000

This study was carried out to investigate the influence of the road structure and site conditions on side-ditch stability of forest road. For experimental purposes, the forest road in the Kwangrung Experimental Forest, Korea Forestry Research Institute, was chosen as a study site. A total of 556 plots wes set up as every longitudinal gradient changing points by belt-transect method. Data of 10 road structural characteristics and side-ditch stability were collected from each plot and analysed by Quantification II. The main factors in order of partial correlation coefficient were longitudinal gradient, road position, inclination of cut-slope, constituent material of cut-slopes, distance of surface flow, cross-sectional shape of road, pavement material, vegetation of cut-slopes and length of cut-slope. The erosion of side-ditch of forest road occurred in the following cases; more than 8% of the longitudinal gradient, road position of hill under side and foot hill, more than $50^{\circ}$ of inclination of cut-slope, constituent material of cut-slopes of hard soil and gravel soil, more than 80m of distance of surface flow, pavement material with earth or gravel, more than medium covered of vegetation of cut-slopes, and the straight and convex form of road-bed.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.7 s.349
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• pp.1-13
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• 2006

In this paper, we introduce a novel key management scheme that is based on the key pre-distribution but provides the key re-distribution method, in order to manage keys for message encryption and authentication of lower-layer sensor nodes on hierarchical mobile sensor networks. The characteristics of our key management are as follows: First, the role of key management is distributed to aggregator nodes as well as a sink node, to overcome the weakness of centralized management. Second, a sink node generates keys using regression model, thus it stores only the information for calculating the keys using the key information received from nodes, but does not store the relationship between a node and a key, and the keys themselves. As the disadvantage of existing key pre-distributions, they do not support the key re-distribution after the deployment of nodes, and it is hard to extend the key information in the case that sensor nodes in the network enlarge. Thirdly, our mechanism provides the resilience to node capture(${\lambda}$-security), also provided by the existing key pre-distributions, and fourth offers the key freshness through key re-distribution, key distribution to mobile nodes, and scalability to make up for the weak points in the existing key pre-distributions. Fifth, our mechanism does not fix the relationship between a node and a key, thus supports the anonymity and untraceability of mobile nodes. Lastly, we compare ours with existing mechanisms, and verify our performance through the overhead analysis of communication, computation, and memory.

• Journal of Dental Rehabilitation and Applied Science
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• v.16 no.3
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• pp.171-185
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• 2000

The treatment objectives of the complete oral rehabilitation are : (1) comfortably functioning temporomandibular joints and stomatognathic musculature, (2) adherence to the basic principle of occlusion advocated by Schuyler, (3) anterior guidance that is in harmony with the envelope of function, (4) restorations that will not violate the patient's neutral zone. There may be many roads to achieving these objectives, but they all convey varing degrees of stress and strain on the dentist and patient. There are no "easy" cases of oral rehabilitation. Time must be taken to think, time must be taken to plan, and time must be taken to perform, since time is the critical element in both success and failure. Moreover, a systematized and integrated approach will lead to a prognosis that is favorable and predictable. This approach facilitates development of optimum oral function, comfort, and esthetics, resulting in a satisfied patient. Such a systematized approach consists of four logical phase : (1) patient evaluation, (2) comprehensive analysis and treatment planning, (3) integrated and systematic reconstruction, and (4) postoperative maintenance. Firstly, we must evaluate the mandibular position. The results of a repetitive, unstrained, nondeflective, nonmanipulated mandibular closure into complete maxillomandibular intercuspation is not so much a "centric" occlusion as it is a stable occlusion. Accordingly, we ought to concern ourselves less with mandibular centricity and more with mandibular stability, which actually is the relationship we are trying to establish. The key to this stability is intercuspal precision. Once neuromuscular passivity has been achieved during an appropriate period of occlusal adjustment and provisionalization, subsequent intercuspal precision becomes the controlling factors in maintaining a stable mandibular position. Secondly, we must evaluate the planned vertical dimension of occlusion in relationship to what may now be an altered(generally diminished), and avoid the hazard of using such an abnormal position to indicate ultimate occlusal contacting points. There are no hard and fast rules to follow, no formulas, and no precise ratios between the vertical dimension of occlusion. Like centric relation, it is an area, not a point.

• Journal of the Korean Institute of Intelligent Systems
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• v.20 no.2
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• pp.165-172
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• 2010

In clinical data minig, choosing the optimal subset of features is such important, not only to reduce the computational complexity but also to improve the usefulness of the model constructed from the given data. Moreover the threshold values (i.e., cut-off points) of selected features are used in a clinical decision criteria of experts for differential diagnosis of diseases. In this paper, we propose a fuzzy discretization approach, which is evaluated by measuring the degree of separation of redundant attribute values in overlapping region, based on spatial distribution of data with continuous attributes. The weighted average of the redundant attribute values is then used to determine the threshold value for each feature and rough set theory is utilized to select a subset of relevant features from the overall features. To verify the validity of the proposed method, we compared experimental results, which applied to classification problem using 668 patients with a chief complaint of dyspnea, based on three discretization methods (i.e., equal-width, equal-frequency, and entropy-based) and proposed discretization method. From the experimental results, we confirm that the discretization methods with fuzzy partition give better results in two evaluation measures, average classification accuracy and G-mean, than those with hard partition.