Modified Structural Modeling Method and Its Application: Behavior Analysis of Passengers for East Japan Railway Company

Nagata, Kiyoshi,Umezawa, Masashi,Amagasa, Michio,Sai, Fuyume Korean Institute of Industrial Engineers 2008 Industrial Engineeering & Management Systems Vol.7 No.3

In order to cope with the ill-defined problem of human behavior being immanent uncertainty, several methodologies have been studied in game theoretic, social psychological and political science frameworks. As methods to arrange system elements systematically and draw out the consenting structural model concretively, ISM, FSM and DEMATEL based on graph theory etc. have been proposed. In this paper, we propose a modified structural modeling method to recognize the nature of problem. We introduce the statistical method to adjust the establishment levels in group decision situation. From this, it will become possible to obtain effectively and smoothly the structural model of group members in comparison with the traditional methods. Further we propose a procedure for achieving the consenting structural model of group members based on the structural modeling method. By applying the method to recognize the nature of ill-defined problems, it will be possible to solve the given problem effectively and rationally. In order to inspect the effectiveness of the method, we conduct a practical problem as an empirical study: "Behavior analysis of passengers for the Joban line of East Japan Railway Company after new railway service of Tsukuba Express opened".

Modified Structural Modeling Method and Its Application

Kiyoshi Nagata,Masashi Umezawa,Michio Amagasa,Fuyume Sai 대한산업공학회 2008 Industrial Engineeering & Management Systems Vol.7 No.3

In order to cope with the ill-defined problem of human behavior being immanent uncertainty, several methodologies have been studied in game theoretic, social psychological and political science frameworks. As methods to arrange system elements systematically and draw out the consenting structural model concretively, ISM, FSM and DEMATEL based on graph theory etc. have been proposed. In this paper, we propose a modified structural modeling method to recognize the nature of problem. We introduce the statistical method to adjust the establishment levels in group decision situation. From this, it will become possible to obtain effectively and smoothly the structural model of group members in comparison with the traditional methods. Further we propose a procedure for achieving the consenting structural model of group members based on the structural modeling method. By applying the method to recognize the nature of ill-defined problems, it will be possible to solve the given problem effectively and rationally. In order to inspect the effectiveness of the method, we conduct a practical problem as an empirical study: “Behavior analysis of passengers for the Joban line of East Japan Railway Company after new railway service of Tsukuba Express opened”.

구강편평상피암에 관한 임상적 연구

Sun Youl Ryu(柳善烈),Teruo Amagasa(天笠光雄),Shigetoshi Shioda(鹽田重利) 대한구강악안면외과학회 1990 대한구강악안면외과학회지 Vol.16 No.2

For the purpose of prevention, early diagnosis and improvement in treatment result of oral cancer, clinical statistical study was performed about clinical and histopathologic findings and treatment of 52 cases of oral squamous cell carcinoma to have been diagnosed and treated in the First Department of Oral Surgery, Faculty of Dentistry, Tokyo Medical and Dental University from the 1st of November, 1988 to the 31th of October, 1989. The results were as follows: 1. In the site distribution, 25 cases(48%) of the tongue was the most frequently involved site, followed by the lower alveolus and gingiva with 7 cases, the buccal mucosa and the maxillary sinus with each 5 cases, the upper alveolus and gingiva with 4 cases, and the floor of mouth and the oropharynx with each 3 cases. 2. Oral squamous cell carcinoma occured more often in males than females with a ratio of 1.5:1, and 88.4% occured between 40 and 79 years of age with a median of 59.7 years. 3. The majority of initial symptom was pain (44.2%) and swelling (28.8%), and 55.8% of patients was visited within 3 months after onset of initial symptom. Thirty-two patients (61.5%) introduced by dentist and 36.5% had previous surgical treatment at another hospital. 4. In the TNM classification, T2 was prominent with 26 cases (50.0%) and NO was 38 cases(73.1%). In the clinical stage grouping, stage Ⅱ was prominent with 22 cases (44.2%). 5. In the mode of growth of the lesions, ulcerative type was prominent with 15 cases (28.3%), and followed by granular, papillary, leukoplakic, deeply infiltrating and erosive type in order of frequency. Large size of the primary tumor was popular in the deeply infiltrating and granular type, and the cervical metastasis was prominent in the ulcerative type. 6. In the degree of differentiation, well differentiated type was prominent with 26 cases (53.8%). 7. In the treatment of primary lesion, the treatment consisted mainly of surgical therapy was prominent with 36 cases (67.3%). Nineteen cases (36.5%) of single therapy and 33 cases (63.2%) of combined therapy was carried out, and rising tendency of combined therapy was observed according to the stage increment. 8. Partial resection or total excision or extended total excision was selected for the method of surgery of the primary lesion by the case, and combined surgery, radiotherapy and regional chemotherapy was applied to the cancer of the upper alveolus and gingiva and the maxillary sinus. Reconstructive surgery was performed in 48.6% of the surgery 35 cases. 9. Radiation therapy was carried in 52.9%, chemotherapy in 53.8%, and immunotherapy in 73.1% of patients. 10. Neck dissection was performed in 21 cases (60.0%) of the surgery 35 cases and the accuracy rate between clinical and histopathological diagnosis about cervical metastasis was 76.2%.

Clinical study of keratocystic odontogenic tumors

Nobuyoshi Tomomatsu,Narikazu Uzawa,Yasuyuki Michi,Kazuto Kurohara,Norihiko Okada,Teruo Amagasa 대한구강악안면외과학회 2012 대한구강악안면외과학회지 Vol.38 No.1

The odontogenic keratocyst (OKC) was originally classified as a developmental cyst, and OKCs were histologically divided into orthokeratotic (O-OKCs) and parakeratotic (P-OKCs) types. Clinical features differ between O-OKCs and P-OKCs with P-OKCs having a tendency to recur after surgical treatment. According to the revised histopathological classification of odontogenic tumors by the World Health Organization (2005) , the term keratocystic odontogenic tumor (KCOT) has been adopted to describe P-OKCs. In this retrospective study, we examined 186 KCOTs treated at the Maxillofacial Surgery Department of the Tokyo Medical and Dental University Hospital from 1981 through 2005. The patients ranged in age from 7 to 85 years (mean, 32.7) and consisted of 93 males and 93 females. The most frequently treated areas were the mandibular molar region and ramus. The majority of KCOTs in the maxillary region were treated by enucleation and primary closure. The majority of KCOTs in the mandibular region were enucleated, and the wound was left open. Marginal resection was performed in the 4 patients with large lesions arising in the mandible. In patients who were followed for more than a year, recurrences were observed in 19 of 120 lesions (15.8%) . The recurrences were found at the margins of the primary lesion in contact with the roots of the teeth or at the upper margins of the mandibular ramus. Clinicians should consider aggressive treatment for KCOTs because the recurrence rate of P-OKCs is higher than that of other cyst types such as O-OKCs, dentigerous cysts, primordial cysts that were non-keratinized, and slightly keratinized stratified squamous epithelium. Although more aggressive treatment is needed for KCOTs as compared to other cystic lesions, it is difficult to make a precise diagnosis preoperatively on the basis of clinical features and X-ray imaging. Therefore, preoperative biopsy is necessary for selecting the appropriate treatment for patients with cystic lesions.