• Journal of the Optical Society of Korea
• /
• v.17 no.4
• /
• pp.323-327
• /
• 2013

A laser ultrasonic inspection system has the advantage of nondestructive testing. It is a non-contact mode using a laser interferometer to measure the vertical displacement of the surface of a material caused by the propagation of ultrasonic signals with the remote ultrasonic generated by laser. After raising the ultrasonic signal with a broadband frequency range using a pulsed laser beam, the laser beam is focused to a small point to measure the ultrasonic signal because it provides an excellent measurement resolution. In this paper, foreign materials are measured by a non-destructive and non-contact method using the laser ultrasonic inspection system. Mixed foreign material on the corroded part is assumed and the laser ultrasonic experiment is conducted. An ultrasonic wave is generated by pulse laser from the back of the specimen and an ultrasonic signal is acquired from the same location of the front side using continuous wave laser and Confocal Fabry-Perot Interferometer (CFPI). The characteristic of the ultrasonic signal of existing foreign material is analyzed and the location and size of foreign material is measured.

• Proceedings of the Korean Society for Agricultural Machinery Conference
• /
• 1996.06c
• /
• pp.334-343
• /
• 1996

Quality evaluation for food and agricultural products have always been one of the most elusive problems associated with the handling , processing and marketing in a food plant production. In order to detect physical foreign materials in food and agricultural products, non-destructive techniques have been developed for many years. Application of X-ray system to detect physical foreign materials in food and agricultural products could be considered to be a high potential method. Especially , it is impossible to detect internal physical foreign materials by visual inspections. In this study, it was tried to be applied for two different X-ray devices. Soft X-ray system with CdTe sensor and X-ray CT scanner were evaluated for advantage of the detection of non-meltallic foreign materials in food and agricultural products . Though the soft X-ray is not a high energy radiation, it is possible to detect small different density in a material. The CdTe sensor has a high resolution for t e soft X-ray energy region. The density characteristics of foods and foreign material were expressed region. The density characteristics of foods and foreign materials were expressed as a soft X-ray energy spectrum. The energy spectrum was analyzed by a personal computer with a multi-channel analyzer. X-ray CT scanner can provide visual image and analyze by three dimensional information inside food and agricultural products. The X-ray CT scanner using as a medical equipment was used to detect a foreign material. The density characteristics of food and foreign materials in food were tried to be detected by the threshold value on the basis of the CT numbers. The soft X-ray absorption characteristics for acrylin plates and distilled water were obtained and could be found the possibility of detecting a small physical foreign materials such as a plastic wrapping film , a stone and grasshopper in food and agricultural products.

• Archives of Plastic Surgery
• /
• v.35 no.5
• /
• pp.622-625
• /
• 2008

Purpose: In the past, laymen or beauty parlor employees commonly injected people with unproven foreign material such as paraffin, silicone, and cooking oil. We have treated a patient who injected foreign material into her face and neck. Methods: For the last 20 years, a 43-year-old woman has been injecting herself in the face and neck with foreign material. There was no tenderness, erythema, pain, ulceration, or necrosis. However many visible, touchable subcutaneous masses were found. Her face was extremely ugly and disfigured by the foreign material. We could not recognize the boundary between her neck and mandible. The occipital scalp drooped extremely. Over the past 3 years, from February 2005 to October 2007, we performed 15 operations. Results: We conducted a cephalometric facial analysis to compare preoperative and postoperative facial diameter. The patient's upper face diameter decreased from 67 cm to 60 cm, the mid face diameter from 82 cm to 59 cm, the lower face diameter from 63 cm to 50 cm, and the neck circumference diameter from 53 cm to 44 cm, respectively. The mid sagittal diameter decreased from 26 cm to 23 cm. The total excised tissue weight was 4023.7 gram after 15 operations. Conclusion: Serial excision of face and neck masses in a patient who injected herself with foreign material resulted in a satisfactory outcome.

• Journal of Chest Surgery
• /
• v.14 no.4
• /
• pp.331-338
• /
• 1981

The inhalation of a foreign body into the tracheobronchial tree is a child is a life-threatening accident. Forgotten foreign bodies In the airways cause chronic pulmonary infections, allergic asthma, bronchiectatic changes, and lung abscess Foreign bodies that cannot be grasped by bronchoscopic forceps should be removed by thoracotomy and bronchotomy. This report describes our experience In 16 patients who were treated to remove inhaled foreign bodies from the airways after repeated bronchoscopies had been unsuccessful from 1963 to 1981 at the department thoracic surgery of Seoul National University Hospital. The surgical procedures are as follows: 12 patients bronchotomy, 2 patient pneumonectomy, 2 patients lobectomy. In these cases, the foreign bodies are 8 metallic material, 3 plastic material, 1 bean, 1 black snail, and 3 cases of no records. Bronchotomy must be performed as soon as possible in order to avoid more advanced pathologic changes In the Involved lung, such as bronchiectasis, fibrosis or abscess.

• Journal of the Institute of Convergence Signal Processing
• /
• v.10 no.2
• /
• pp.120-126
• /
• 2009

There are many different types of surface defects on semiconductor Integrated Chips (IC's) caused by various factors during manufacturing process, such as cracks, foreign materials, chip-outs, chips, and voids. These defects must be detected and classified by an inspection system for productivity improvement and effective process control. Among defects, in particular, foreign materials and chips are the most difficult ones to classify accurately. A vision system composed of a carefully designed optical system and a processing algorithm is proposed to detect and classify the defects on QFN(Quad Flat No-leads) packages. The processing algorithm uses features derived from the defect's position and brightness value in the Maximum Likelihood classifier and the optical system is designed to effectively extract the features used in the classifier. In experiments we confirm that this method gives more effective result in classifying foreign materials and chips.

• The Journal of the Korean dental association
• /
• v.50 no.12
• /
• pp.755-762
• /
• 2012

Objective : The aim of this study was to investigate risk factor, precaution and treatment of aspirated foreign body during dental procedure. Material and Methods : Twenty cases of accidental aspiration of the foreign body, which removed by bronchoscopy at the Asan Medical Center between 2008 and 2012, were analyzed retrospectively. Results : Ten cases of accidental aspiration were occurred during dental procedure. Symtoms include cough(65%), dyspnea(50%), sputum(25%) and wheezing(25%). The most common location of foreign body was right bronchial tree(50%), left bronchial tree(45%) and carina(5%). Patients risk factors were chronic obstructive pulmonary disease, lung cancer, pulmonary tuberculosis, esophageal cancer and vegetative state. Conclusion : Accidental aspiration or swallowing of dental instrument or material is not uncommon accidents in dental practice. Most foreign bodies enter into gastrointestinal tract spontaneously. But aspiration into broncho-trachea can be more serious events and must be treated as an emergency situation. Prompt emergency treatment and removal of the foreign body is necessary to avoid complication. Dentists must have knowledge about the precaution and be ready to deal with foreign body aspiration during dental procedures.

• Journal of the Korean Society for Nondestructive Testing
• /
• v.33 no.2
• /
• pp.160-164
• /
• 2013

A laser ultrasonic inspection system is a non-contact inspection device which generates and measures ultrasonics by using laser beam. A laser ultrasonic inspection system provides a high measurement resolution because the ultrasonic signal generated by a pulse laser beam has a wide-band spectrum and the ultrasonic signal is measured from a small focused spot of a measuring laser beam. In this study, galvanic corrosion phenomenon was measured by non-destructive and non-contact method using the laser. The case of mixed foreign material on the part of corrosion was assumed and laser ultrasonic experiment was conducted. Ultrasonic was generated by pulse laser from the back side of the specimen and ultrasonic signal was acquired from the same location of the front side using continuous wave laser and Confocal Fabry-Perot Interferometer(CFPI). The characteristic of the ultrasonic signal of exist foreign material part was analyzed and the location and size of foreign material was measured.

• Korean Journal of Bronchoesophagology
• /
• v.10 no.1 s.19
• /
• pp.46-50
• /
• 2004

The majority of esophageal Foreign body ingestions occur in the pediatric population. In adults, true foreign object ingestion occurs more commonly among those with psychiatric disorders, mental impairment. The management of esophageal foreign bodies is influenced by the age, clinical condition of ingested material, anatomic location and technical abilities of the endoscopist. Recently the therapeutic endoscopy is becoming wider and more rational in application. We evaluated the role of endoscopy for removal of esophageal foreign bodies during the period of 4 years from January 2000 to December 2003 at the Department of Otolaryngology and Gastroenterology, Seonam University Hospital. The results were as follow, 1) The age ranged from 21 to 74 years old (mean 50.5), most frequent age group was between 61-70 years old and male to female ratio was 1:1.4. 2) Fish bone was the most frequent foreign body in the esophagus ($47.1\%$), food material ($23.5\%$) and meats ($17.6\%$) were next frequent foreign bodies. The most frequent site of lodgement was the first ($78.4\%$), second ($17.6\%$) and third narrowing ($3.9\%$) in order. 3) The most common symptom was foreign body sensation (28.6%). the next common symptoms were chest discomfort($23.8\%$) and dysphagia($19\%$). 4) In duration of lodgement, 49cases ($96.1\%$) were lodged for less than one day. 5) The foreign bodies of esophagus were removed successfully by flexible endoscope with basket, snare, forceps, overtube and endoscopic variceal ligation cap. There were only 3 cases of minimal complications, esophageal mucosal tearing. In conclusion, endoscopic esophageal foreign body removal is useful and safe with minimal or no complications.

• Journal of the Korean Society of Environmental Restoration Technology
• /
• v.7 no.1
• /
• pp.85-96
• /
• 2004

The purpose of this study is to present the legal object in the related legislation taking the present condition of the domestic laws and the leading cases connected with ecological restoration materials and analyzing their properties according to the analytic standards which are legal class and ecological restoration material items, the present condition by the field of ecological restoration business, interrelationship between the law and the leading cases, comparison of the domestic laws with the foreign regulations. The results of this study are as follows; 1) Detailed enforcement regulation(36.5% of totals), enforcement regulation(32.4%) and law(31.1%) as legal class of the domestic legislation relating to ecological restoration materials are in the order of frequency that shows the little strong frequency at low-ranking class. By items, the number of legislation relating to planting material holds about majority, next to it, stone material, soil material and wood material are in the order of frequency. 2) By the field of ecological restoration business, legislation relating to administration forms the highest frequency(36.3% of totals), next to it, material properties(23.4%), plan design(13.0%) are in the order of frequency. 3) For the number of the leading cases by items of ecological restoration materials, those are, for the most part, them relating to planting material(93.8% of totals). The number of legislation relating to planting material forms the highest frequency at laws and the leading cases in common. 4) The domestic legislation connected with ecological restoration materials is mainly to be in legal class of the positive law, on the contrary, a foreign country has legislation widely consisted of laws, ordinances and other general regulations. Some foreign country legislated the topsoil conservation act, but not to domestic. The result of this study will be applied to legislature and court as reference materials, and to the public and public officer as a means of an understanding of ecological restoration materials.

• The Research Journal of the Costume Culture
• /
• v.32 no.1
• /
• pp.86-107
• /
• 2024

Although interest in eco-friendly fashion products is increasing among scholars and industry leaders, the concept of eco-friendly products remains unclear, preventing consistent assessment of which fashion products are eco-friendly. This study conducted a content analysis of eco-friendly product information from 87 domestic and 102 foreign brands to reveal key standards for categorizing eco-friendly fashion products. Product characteristic information was coded according to the four material-based standards (i.e., organic material, regenerative material, alternative material, and sustainably produced/upcycled material). Consistency between coders was confirmed by Cohen's kappa. In results, eco-friendly fashion products are categorized by four material-based standards and two certification standards (i.e., certified, not certified). Among the four material-based categories, the greatest number of domestic and foreign companies produced eco-friendly products that were classified as the regenerative material group. In addition, companies acquired eco-friendly certifications related to the use of organic, regenerative, and alternative materials. The greatest number of eco-friendly material brands used for eco-friendly fashion products belonged to the regenerative material group. Based on the study results, a typology of eco-friendly products was suggested. This typology can benefit practitioners and academics by highlighting a need for classification system for the eco-friendly fashion products, as well as by providing insight into the categorization of eco-friendly fashion products.